fluencelabs/dweb-transports
1
0
Fork 0
mirror of https://github.com/fluencelabs/dweb-transports synced 2025-03-15 10:30:48 +00:00
Code Issues Projects Releases Wiki Activity

Copy files from omnibus dweb-transport, and comment out unused parts

Browse Source
This commit is contained in:
Mitra Ardron 2018-04-06 19:28:04 +10:00
parent 2dabacf4f7
commit 47e32e42ed
11 changed files with 3085 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

661
dist/LICENSE vendored Normal file
View File

@ -0,0 +1,661 @@
GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
our General Public Licenses are intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
Developers that use our General Public Licenses protect your rights
with two steps: (1) assert copyright on the software, and (2) offer
you this License which gives you legal permission to copy, distribute
and/or modify the software.
A secondary benefit of defending all users' freedom is that
improvements made in alternate versions of the program, if they
receive widespread use, become available for other developers to
incorporate. Many developers of free software are heartened and
encouraged by the resulting cooperation. However, in the case of
software used on network servers, this result may fail to come about.
The GNU General Public License permits making a modified version and
letting the public access it on a server without ever releasing its
source code to the public.
The GNU Affero General Public License is designed specifically to
ensure that, in such cases, the modified source code becomes available
to the community. It requires the operator of a network server to
provide the source code of the modified version running there to the
users of that server. Therefore, public use of a modified version, on
a publicly accessible server, gives the public access to the source
code of the modified version.
An older license, called the Affero General Public License and
published by Affero, was designed to accomplish similar goals. This is
a different license, not a version of the Affero GPL, but Affero has
released a new version of the Affero GPL which permits relicensing under
this license.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU Affero General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To "convey" a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred form of the work
for making modifications to it. "Object code" means any non-source
form of a work.
A "Standard Interface" means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.
The "System Libraries" of an executable work include anything, other
than the work as a whole, that (a) is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and (b) serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form. A
"Major Component", in this context, means a major essential component
(kernel, window system, and so on) of the specific operating system
(if any) on which the executable work runs, or a compiler used to
produce the work, or an object code interpreter used to run it.
The "Corresponding Source" for a work in object code form means all
the source code needed to generate, install, and (for an executable
work) run the object code and to modify the work, including scripts to
control those activities. However, it does not include the work's
System Libraries, or general-purpose tools or generally available free
programs which are used unmodified in performing those activities but
which are not part of the work. For example, Corresponding Source
includes interface definition files associated with source files for
the work, and the source code for shared libraries and dynamically
linked subprograms that the work is specifically designed to require,
such as by intimate data communication or control flow between those
subprograms and other parts of the work.
The Corresponding Source need not include anything that users
can regenerate automatically from other parts of the Corresponding
Source.
The Corresponding Source for a work in source code form is that
same work.
2. Basic Permissions.
All rights granted under this License are granted for the term of
copyright on the Program, and are irrevocable provided the stated
conditions are met. This License explicitly affirms your unlimited
permission to run the unmodified Program. The output from running a
covered work is covered by this License only if the output, given its
content, constitutes a covered work. This License acknowledges your
rights of fair use or other equivalent, as provided by copyright law.
You may make, run and propagate covered works that you do not
convey, without conditions so long as your license otherwise remains
in force. You may convey covered works to others for the sole purpose
of having them make modifications exclusively for you, or provide you
with facilities for running those works, provided that you comply with
the terms of this License in conveying all material for which you do
not control copyright. Those thus making or running the covered works
for you must do so exclusively on your behalf, under your direction
and control, on terms that prohibit them from making any copies of
your copyrighted material outside their relationship with you.
Conveying under any other circumstances is permitted solely under
the conditions stated below. Sublicensing is not allowed; section 10
makes it unnecessary.
3. Protecting Users' Legal Rights From Anti-Circumvention Law.
No covered work shall be deemed part of an effective technological
measure under any applicable law fulfilling obligations under article
11 of the WIPO copyright treaty adopted on 20 December 1996, or
similar laws prohibiting or restricting circumvention of such
measures.
When you convey a covered work, you waive any legal power to forbid
circumvention of technological measures to the extent such circumvention
is effected by exercising rights under this License with respect to
the covered work, and you disclaim any intention to limit operation or
modification of the work as a means of enforcing, against the work's
users, your or third parties' legal rights to forbid circumvention of
technological measures.
4. Conveying Verbatim Copies.
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
5. Conveying Modified Source Versions.
You may convey a work based on the Program, or the modifications to
produce it from the Program, in the form of source code under the
terms of section 4, provided that you also meet all of these conditions:
a) The work must carry prominent notices stating that you modified
it, and giving a relevant date.
b) The work must carry prominent notices stating that it is
released under this License and any conditions added under section
7. This requirement modifies the requirement in section 4 to
"keep intact all notices".
c) You must license the entire work, as a whole, under this
License to anyone who comes into possession of a copy. This
License will therefore apply, along with any applicable section 7
additional terms, to the whole of the work, and all its parts,
regardless of how they are packaged. This License gives no
permission to license the work in any other way, but it does not
invalidate such permission if you have separately received it.
d) If the work has interactive user interfaces, each must display
Appropriate Legal Notices; however, if the Program has interactive
interfaces that do not display Appropriate Legal Notices, your
work need not make them do so.
A compilation of a covered work with other separate and independent
works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
6. Conveying Non-Source Forms.
You may convey a covered work in object code form under the terms
of sections 4 and 5, provided that you also convey the
machine-readable Corresponding Source under the terms of this License,
in one of these ways:
a) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by the
Corresponding Source fixed on a durable physical medium
customarily used for software interchange.
b) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by a
written offer, valid for at least three years and valid for as
long as you offer spare parts or customer support for that product
model, to give anyone who possesses the object code either (1) a
copy of the Corresponding Source for all the software in the
product that is covered by this License, on a durable physical
medium customarily used for software interchange, for a price no
more than your reasonable cost of physically performing this
conveying of source, or (2) access to copy the
Corresponding Source from a network server at no charge.
c) Convey individual copies of the object code with a copy of the
written offer to provide the Corresponding Source. This
alternative is allowed only occasionally and noncommercially, and
only if you received the object code with such an offer, in accord
with subsection 6b.
d) Convey the object code by offering access from a designated
place (gratis or for a charge), and offer equivalent access to the
Corresponding Source in the same way through the same place at no
further charge. You need not require recipients to copy the
Corresponding Source along with the object code. If the place to
copy the object code is a network server, the Corresponding Source
may be on a different server (operated by you or a third party)
that supports equivalent copying facilities, provided you maintain
clear directions next to the object code saying where to find the
Corresponding Source. Regardless of what server hosts the
Corresponding Source, you remain obligated to ensure that it is
available for as long as needed to satisfy these requirements.
e) Convey the object code using peer-to-peer transmission, provided
you inform other peers where the object code and Corresponding
Source of the work are being offered to the general public at no
charge under subsection 6d.
A separable portion of the object code, whose source code is excluded
from the Corresponding Source as a System Library, need not be
included in conveying the object code work.
A "User Product" is either (1) a "consumer product", which means any
tangible personal property which is normally used for personal, family,
or household purposes, or (2) anything designed or sold for incorporation
into a dwelling. In determining whether a product is a consumer product,
doubtful cases shall be resolved in favor of coverage. For a particular
product received by a particular user, "normally used" refers to a
typical or common use of that class of product, regardless of the status
of the particular user or of the way in which the particular user
actually uses, or expects or is expected to use, the product. A product
is a consumer product regardless of whether the product has substantial
commercial, industrial or non-consumer uses, unless such uses represent
the only significant mode of use of the product.
"Installation Information" for a User Product means any methods,
procedures, authorization keys, or other information required to install
and execute modified versions of a covered work in that User Product from
a modified version of its Corresponding Source. The information must
suffice to ensure that the continued functioning of the modified object
code is in no case prevented or interfered with solely because
modification has been made.
If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as
part of a transaction in which the right of possession and use of the
User Product is transferred to the recipient in perpetuity or for a
fixed term (regardless of how the transaction is characterized), the
Corresponding Source conveyed under this section must be accompanied
by the Installation Information. But this requirement does not apply
if neither you nor any third party retains the ability to install
modified object code on the User Product (for example, the work has
been installed in ROM).
The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates
for a work that has been modified or installed by the recipient, or for
the User Product in which it has been modified or installed. Access to a
network may be denied when the modification itself materially and
adversely affects the operation of the network or violates the rules and
protocols for communication across the network.
Corresponding Source conveyed, and Installation Information provided,
in accord with this section must be in a format that is publicly
documented (and with an implementation available to the public in
source code form), and must require no special password or key for
unpacking, reading or copying.
7. Additional Terms.
"Additional permissions" are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law. If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.
When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it. (Additional permissions may be written to require their own
removal in certain cases when you modify the work.) You may place
additional permissions on material, added by you to a covered work,
for which you have or can give appropriate copyright permission.
Notwithstanding any other provision of this License, for material you
add to a covered work, you may (if authorized by the copyright holders of
that material) supplement the terms of this License with terms:
a) Disclaiming warranty or limiting liability differently from the
terms of sections 15 and 16 of this License; or
b) Requiring preservation of specified reasonable legal notices or
author attributions in that material or in the Appropriate Legal
Notices displayed by works containing it; or
c) Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
reasonable ways as different from the original version; or
d) Limiting the use for publicity purposes of names of licensors or
authors of the material; or
e) Declining to grant rights under trademark law for use of some
trade names, trademarks, or service marks; or
f) Requiring indemnification of licensors and authors of that
material by anyone who conveys the material (or modified versions of
it) with contractual assumptions of liability to the recipient, for
any liability that these contractual assumptions directly impose on
those licensors and authors.
All other non-permissive additional terms are considered "further
restrictions" within the meaning of section 10. If the Program as you
received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further
restriction, you may remove that term. If a license document contains
a further restriction but permits relicensing or conveying under this
License, you may add to a covered work material governed by the terms
of that license document, provided that the further restriction does
not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions;
the above requirements apply either way.
8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the copyright
holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not responsible
for enforcing compliance by third parties with this License.
An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Remote Network Interaction; Use with the GNU General Public License.
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your version
supports such interaction) an opportunity to receive the Corresponding
Source of your version by providing access to the Corresponding Source
from a network server at no charge, through some standard or customary
means of facilitating copying of software. This Corresponding Source
shall include the Corresponding Source for any work covered by version 3
of the GNU General Public License that is incorporated pursuant to the
following paragraph.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the work with which it is combined will remain governed by version
3 of the GNU General Public License.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU Affero General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU Affero General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU Affero General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<http://www.gnu.org/licenses/>.

2
dist/README.md vendored Normal file
View File

@ -0,0 +1,2 @@
# DwebTransports
General transport library for Decentralized Web handles multiple underlying transports

38
package.json Normal file
View File

@ -0,0 +1,38 @@
{
"name": "dweb-transports",
"version": "0.0.1",
"description": "Internet Archive Decentralized Web Transports Library",
"dependencies": {
"cids": "latest",
"ipfs": "latest",
"ipld-dag-pb": "latest",
"ipfs-unixfs": "latest",
"readable-stream": "latest",
"node-fetch": "latest",
"webtorrent": "latest",
'yjs': "latest",
'y-memory': "latest",
'y-array': "latest",
'y-text': "latest",
'y-map': "latest",
'y-ipfs-connector': "latest",
'y-indexeddb': "latest"
},
"keywords": [],
"license": "AGPL-3.0",
"author": {
"name": "Mitra Ardron",
"email": "mitra@archive.org",
"url": "http://www.mitra.biz"
},
"devDependencies": {
"browserify": "^14.5.0",
"watchify": "^3.11.0"
},
"scripts": {
"bundle": "cd src; browserify ./dweb-transports_all.js > ../dist/dweb_transports_bundle.js",
"watch": "watchify src/dweb-transports_all.js -o dist/dweb_transports_bundle.js --verbose",
"test": "cd src; node ./test.js",
"help": "echo 'test (test it)'; echo 'bundle (packs into ../examples)'; echo 'watch: continually bundles whenever files change'"
}
}

106
src/Errors.js Normal file
View File

@ -0,0 +1,106 @@
errors = {};
// Use this when the code logic has been broken - e.g. something is called with an undefined parameter, its preferable to console.assert
// Typically this is an error, that should have been caught higher up.
class CodingError extends Error {
constructor(message) {
super(message || "Coding Error");
this.name = "CodingError"
}
}
errors.CodingError = CodingError;
// These are equivalent of python exceptions, will log and raise alert in most cases - exceptions aren't caught
class ToBeImplementedError extends Error {
constructor(message) {
super("To be implemented: " + message);
this.name = "ToBeImplementedError"
}
}
errors.ToBeImplementedError = ToBeImplementedError;
class TransportError extends Error {
constructor(message) {
super(message || "Transport failure");
this.name = "TransportError"
}
}
errors.TransportError = TransportError;
/*---- Below here are errors copied from previous Dweb-Transport and not currently used */
/*
class ObsoleteError extends Error {
constructor(message) {
super("Obsolete: " + message);
this.name = "ObsoleteError"
}
}
errors.ObsoleteError = ObsoleteError;
// Use this when the logic of encryption wont let you do something, typically something higher should have stopped you trying.
// Examples include signing something when you only have a public key.
class EncryptionError extends Error {
constructor(message) {
super(message || "Encryption Error");
this.name = "EncryptionError"
}
}
errors.EncryptionError = EncryptionError;
// Use this something that should have been signed isn't - this is externally signed, i.e. a data rather than coding error
class SigningError extends Error {
constructor(message) {
super(message || "Signing Error");
this.name = "SigningError"
}
}
errors.SigningError = SigningError;
class ForbiddenError extends Error {
constructor(message) {
super(message || "Forbidden failure");
this.name = "ForbiddenError"
}
}
errors.ForbiddenError = ForbiddenError;
class AuthenticationError extends Error {
constructor(message) {
super(message || "Authentication failure");
this.name = "AuthenticationError"
}
}
errors.AuthenticationError = AuthenticationError;
class IntentionallyUnimplementedError extends Error {
constructor(message) {
super(message || "Intentionally Unimplemented Function");
this.name = "IntentionallyUnimplementedError"
}
}
errors.IntentionallyUnimplementedError = IntentionallyUnimplementedError;
class DecryptionFailError extends Error {
constructor(message) {
super(message || "Decryption Failed");
this.name = "DecryptionFailError"
}
}
errors.DecryptionFailError = DecryptionFailError;
class SecurityWarning extends Error {
constructor(message) {
super(message || "Security Warning");
this.name = "SecurityWarning"
}
}
errors.SecurityWarning = SecurityWarning;
class ResolutionError extends Error {
constructor(message) {
super(message || "Resolution failure");
this.name = "ResolutionError"
}
}
errors.ResolutionError = ResolutionError;
*/
exports = module.exports = errors;

308
src/Transport.js Normal file
View File

@ -0,0 +1,308 @@
const Url = require('url');
const stream = require('readable-stream');
const errors = require('./Errors'); // Standard Dweb Errors
function delay(ms, val) { return new Promise(resolve => {setTimeout(() => { resolve(val); },ms)})}
class Transport {
constructor(options, verbose) {
/*
Doesnt do anything, its all done by SuperClasses,
Superclass should merge with default options, call super
*/
}
setup0(options, verbose) {
/*
First part of setup, create obj, add to Transports but dont attempt to connect, typically called instead of p_setup if want to parallelize connections.
*/
throw new errors.IntentionallyUnimplementedError("Intentionally undefined function Transport.setup0 should have been subclassed");
}
p_setup1(options, verbose) { return this; }
p_setup2(options, verbose) { return this; }
static async p_setup(options, verbose) {
/*
Setup the resource and open any P2P connections etc required to be done just once.
In almost all cases this will call the constructor of the subclass
:param obj options: Data structure required by underlying transport layer (format determined by that layer)
:param boolean verbose: true for debugging output
:resolve Transport: Instance of subclass of Transport
*/
let t = await this.setup0(options, verbose) // Sync version that doesnt connect
.p_setup1(verbose); // And connect
return t.p_setup2(verbose); // And connect
}
togglePaused() {
switch (this.status) {
case Transport.STATUS_CONNECTED:
this.status = Transport.STATUS_PAUSED;
break;
case Transport.STATUS_PAUSED:
this.status = Transport.STATUS_CONNECTED; // Superclass might change to STATUS_STARTING if needs to stop/restart
break;
}
}
supports(url, func) {
/*
Determine if this transport supports a certain set of URLs and a func
:param url: String or parsed URL
:return: true if this protocol supports these URLs and this func
:throw: TransportError if invalid URL
*/
if (typeof url === "string") {
url = Url.parse(url); // For efficiency, only parse once.
}
if (url && !url.protocol) {
throw new Error("URL failed to specific a scheme (before :) " + url.href)
} //Should be TransportError but out of scope here
// noinspection Annotator supportURLs is defined in subclasses
return ( (!url || this.supportURLs.includes(url.protocol.slice(0, -1)))
&& (!func || this.supportFunctions.includes(func)))
}
p_rawstore(data, verbose) {
/*
Store a blob of data onto the decentralised transport.
Returns a promise that resolves to the url of the data
:param string|Buffer data: Data to store - no assumptions made to size or content
:param boolean verbose: true for debugging output
:resolve string: url of data stored
*/
throw new errors.ToBeImplementedError("Intentionally undefined function Transport.p_rawstore should have been subclassed");
}
async p_rawstoreCaught(data, verbose) {
try {
return await this.p_rawstore(data, verbose);
} catch (err) {
}
}
p_store() {
throw new errors.ToBeImplementedError("Undefined function Transport.p_store - may define higher level semantics here (see Python)");
}
//noinspection JSUnusedLocalSymbols
p_rawfetch(url, {verbose=false}={}) {
/*
Fetch some bytes based on a url, no assumption is made about the data in terms of size or structure.
Where required by the underlying transport it should retrieve a number if its "blocks" and concatenate them.
Returns a new Promise that resolves currently to a string.
There may also be need for a streaming version of this call, at this point undefined.
:param string url: URL of object being retrieved
:param boolean verbose: true for debugging output
:resolve string: Return the object being fetched, (note currently returned as a string, may refactor to return Buffer)
:throws: TransportError if url invalid - note this happens immediately, not as a catch in the promise
*/
console.assert(false, "Intentionally undefined function Transport.p_rawfetch should have been subclassed");
}
p_fetch() {
throw new errors.ToBeImplementedError("Undefined function Transport.p_fetch - may define higher level semantics here (see Python)");
}
p_rawadd(url, sig, verbose) {
/*
Store a new list item, ideally it should be stored so that it can be retrieved either by "signedby" (using p_rawlist) or
by "url" (with p_rawreverse). The underlying transport does not need to guarantee the signature,
an invalid item on a list should be rejected on higher layers.
:param string url: String identifying an object being added to the list.
:param Signature sig: A signature data structure.
:param boolean verbose: true for debugging output
:resolve undefined:
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_rawadd");
}
p_rawlist(url, verbose) {
/*
Fetch all the objects in a list, these are identified by the url of the public key used for signing.
(Note this is the 'signedby' parameter of the p_rawadd call, not the 'url' parameter
Returns a promise that resolves to the list.
Each item of the list is a dict: {"url": url, "date": date, "signature": signature, "signedby": signedby}
List items may have other data (e.g. reference ids of underlying transport)
:param string url: String with the url that identifies the list.
:param boolean verbose: true for debugging output
:resolve array: An array of objects as stored on the list.
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_rawlist");
}
p_list() {
throw new Error("Undefined function Transport.p_list");
}
p_newlisturls(cl, verbose) {
/*
Must be implemented by any list, return a pair of URLS that may be the same, private and public links to the list.
returns: ( privateurl, publicurl) e.g. yjs:xyz/abc or orbitdb:a123
*/
throw new Error("undefined function Transport.p_newlisturls");
}
//noinspection JSUnusedGlobalSymbols
p_rawreverse(url, verbose) {
/*
Similar to p_rawlist, but return the list item of all the places where the object url has been listed.
The url here corresponds to the "url" parameter of p_rawadd
Returns a promise that resolves to the list.
:param string url: String with the url that identifies the object put on a list.
:param boolean verbose: true for debugging output
:resolve array: An array of objects as stored on the list.
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_rawreverse");
}
listmonitor(url, callback, verbose) {
/*
Setup a callback called whenever an item is added to a list, typically it would be called immediately after a p_rawlist to get any more items not returned by p_rawlist.
:param url: string Identifier of list (as used by p_rawlist and "signedby" parameter of p_rawadd
:param callback: function(obj) Callback for each new item added to the list
obj is same format as p_rawlist or p_rawreverse
:param verbose: boolean - true for debugging output
*/
console.log("Undefined function Transport.listmonitor"); // Note intentionally a log, as legitamte to not implement it
}
// ==== TO SUPPORT KEY VALUE INTERFACES IMPLEMENT THESE =====
// Support for Key-Value pairs as per
// https://docs.google.com/document/d/1yfmLRqKPxKwB939wIy9sSaa7GKOzM5PrCZ4W1jRGW6M/edit#
async p_newdatabase(pubkey, verbose) {
/*
Create a new database based on some existing object
pubkey: Something that is, or has a pubkey, by default support Dweb.PublicPrivate, KeyPair or an array of strings as in the output of keypair.publicexport()
returns: {publicurl, privateurl} which may be the same if there is no write authentication
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_newdatabase");
}
//TODO maybe change the listmonitor / monitor code for to use "on" and the structure of PP.events
//TODO but note https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy about Proxy which might be suitable, prob not as doesnt map well to lists
async p_newtable(pubkey, table, verbose) {
/*
Create a new table,
pubkey: Is or has a pubkey (see p_newdatabase)
table: String representing the table - unique to the database
returns: {privateurl, publicurl} which may be the same if there is no write authentication
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_newtable");
}
async p_set(url, keyvalues, value, verbose) { // url = yjs:/yjs/database/table/key
/*
Set one or more keys in a table.
url: URL of the table
keyvalues: String representing a single key OR dictionary of keys
value: String or other object to be stored (its not defined yet what objects should be supported, e.g. any object ?
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_set");
}
async p_get(url, keys, verbose) {
/* Get one or more keys from a table
url: URL of the table
keys: Array of keys
returns: Dictionary of values found (undefined if not found)
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_get");
}
async p_delete(url, keys, verbose) {
/* Delete one or more keys from a table
url: URL of the table
keys: Array of keys
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_delete");
}
async p_keys(url, verbose) {
/* Return a list of keys in a table (suitable for iterating through)
url: URL of the table
returns: Array of strings
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_keys");
}
async p_getall(url, verbose) {
/* Return a dictionary representing the table
url: URL of the table
returns: Dictionary of Key:Value pairs, note take care if this could be large.
*/
throw new errors.ToBeImplementedError("Undefined function Transport.p_keys");
}
// ------ UTILITY FUNCTIONS, NOT REQD TO BE SUBCLASSED ----
static mergeoptions(a) {
/*
Deep merge options dictionaries
*/
let c = {};
for (let i = 0; i < arguments.length; i++) {
let b = arguments[i];
for (let key in b) {
let val = b[key];
if ((typeof val === "object") && !Array.isArray(val) && c[key]) {
c[key] = Transport.mergeoptions(a[key], b[key]);
} else {
c[key] = b[key];
}
}
}
return c;
}
async p_test_kvt(urlexpectedsubstring, verbose=false) {
/*
Test the KeyValue functionality of any transport that supports it.
urlexpectedsubstring: Some string expected in the publicurl of the table.
*/
if (verbose) {console.log(this.name,"p_test_kvt")}
try {
let table = await this.p_newtable("NACL VERIFY:1234567","mytable", verbose);
let mapurl = table.publicurl;
if (verbose) console.log("newtable=",mapurl);
console.assert(mapurl.includes(urlexpectedsubstring));
await this.p_set(mapurl, "testkey", "testvalue", verbose);
let res = await this.p_get(mapurl, "testkey", verbose);
console.assert(res === "testvalue");
await this.p_set(mapurl, "testkey2", {foo: "bar"}, verbose); // Try setting to an object
res = await this.p_get(mapurl, "testkey2", verbose);
console.assert(res.foo === "bar");
await this.p_set(mapurl, "testkey3", [1,2,3], verbose); // Try setting to an array
res = await this.p_get(mapurl, "testkey3", verbose);
console.assert(res[1] === 2);
res = await this.p_keys(mapurl);
console.assert(res.includes("testkey") && res.includes("testkey3"));
res = await this.p_delete(mapurl, ["testkey"]);
res = await this.p_getall(mapurl, verbose);
if (verbose) console.log("getall=>",res);
console.assert(res.testkey2.foo === "bar" && res.testkey3["1"] === 2 && !res.testkey1);
await delay(200);
if (verbose) console.log(this.name, "p_test_kvt complete")
} catch(err) {
console.log("Exception thrown in ", this.name, "p_test_kvt:", err.message);
throw err;
}
}
}
Transport.STATUS_CONNECTED = 0; // Connected - all other numbers are some version of not ok to use
Transport.STATUS_FAILED = 1; // Failed to connect
Transport.STATUS_STARTING = 2; // In the process of connecting
Transport.STATUS_LOADED = 3; // Code loaded, but haven't tried to connect. (this is typically hard coded in subclasses constructor)
Transport.STATUS_PAUSED = 4; // It was launched, probably connected, but now paused so will be ignored by validFor
exports = module.exports = Transport;

331
src/TransportHTTP.js Normal file
View File

@ -0,0 +1,331 @@
const errors = require('./Errors'); // Standard Dweb Errors
const Transport = require('./Transport'); // Base class for TransportXyz
const Transports = require('./Transports'); // Manage all Transports that are loaded
const nodefetch = require('node-fetch'); // Note, were using node-fetch-npm which had a warning in webpack see https://github.com/bitinn/node-fetch/issues/421 and is intended for clients
const Url = require('url');
var fetch,Headers,Request;
if (typeof(Window) === "undefined") {
//var fetch = require('whatwg-fetch').fetch; //Not as good as node-fetch-npm, but might be the polyfill needed for browser.safari
//XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest; // Note this doesnt work if set to a var or const, needed by whatwg-fetch
console.log("Node loaded");
fetch = nodefetch;
Headers = fetch.Headers; // A class
Request = fetch.Request; // A class
} else {
// If on a browser, need to find fetch,Headers,Request in window
console.log("Loading browser version of fetch,Headers,Request");
fetch = window.fetch;
Headers = window.Headers;
Request = window.Request;
}
//TODO-HTTP to work on Safari or mobile will require a polyfill, see https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch for comment
defaulthttpoptions = {
urlbase: 'https://gateway.dweb.me:443'
};
servercommands = { // What the server wants to see to return each of these
rawfetch: "content/rawfetch",
rawstore: "contenturl/rawstore",
rawadd: "void/rawadd",
rawlist: "metadata/rawlist",
get: "get/table",
set: "set/table",
delete: "delete/table",
keys: "keys/table",
getall: "getall/table"
};
class TransportHTTP extends Transport {
constructor(options, verbose) {
super(options, verbose);
this.options = options;
this.urlbase = options.http.urlbase;
this.supportURLs = ['contenthash', 'http','https'];
this.supportFunctions = ['fetch', 'store', 'add', 'list', 'reverse', 'newlisturls', "get", "set", "keys", "getall", "delete", "newtable", "newdatabase"]; //Does not support: listmonitor - reverse is disabled somewhere not sure if here or caller
this.supportFeatures = ['fetch.range']
this.name = "HTTP"; // For console log etc
this.status = Transport.STATUS_LOADED;
}
static setup0(options, verbose) {
let combinedoptions = Transport.mergeoptions({ http: defaulthttpoptions },options);
try {
let t = new TransportHTTP(combinedoptions, verbose);
Transports.addtransport(t);
return t;
} catch (err) {
console.log("Exception thrown in TransportHTTP.p_setup", err.message);
throw err;
}
}
async p_setup1(verbose) {
return this;
}
async p_status(verbose) { //TODO-BACKPORT
/*
Return a string for the status of a transport. No particular format, but keep it short as it will probably be in a small area of the screen.
resolves to: String representing type connected (always HTTP) and online if online.
*/
try {
this.info = await this.p_info(verbose);
this.status = Transport.STATUS_CONNECTED;
} catch(err) {
console.log(this.name, ": Error in p_status.info",err.message);
this.status = Transport.STATUS_FAILED;
}
return this.status;
}
async p_httpfetch(httpurl, init, verbose) { // Embrace and extend "fetch" to check result etc.
/*
Fetch a url based from default server at command/multihash
url: optional (depends on command)
resolves to: data as text or json depending on Content-Type header
throws: TransportError if fails to fetch
*/
try {
if (verbose) console.log("httpurl=%s init=%o", httpurl, init);
//console.log('CTX=',init["headers"].get('Content-Type'))
// Using window.fetch, because it doesn't appear to be in scope otherwise in the browser.
let response = await fetch(new Request(httpurl, init));
// fetch throws (on Chrome, untested on Firefox or Node) TypeError: Failed to fetch)
// Note response.body gets a stream and response.blob gets a blob and response.arrayBuffer gets a buffer.
if (response.ok) {
let contenttype = response.headers.get('Content-Type');
if (contenttype === "application/json") {
return response.json(); // promise resolving to JSON
} else if (contenttype.startsWith("text")) { // Note in particular this is used for responses to store
return response.text(); // promise resolving to arrayBuffer (was returning text, but distorts binaries (e.g. jpegs)
} else { // Typically application/octetStream when don't know what fetching
return new Buffer(await response.arrayBuffer()); // Convert arrayBuffer to Buffer which is much more usable currently
}
}
// noinspection ExceptionCaughtLocallyJS
throw new errors.TransportError(`Transport Error ${response.status}: ${response.statusText}`);
} catch (err) {
// Error here is particularly unhelpful - if rejected during the COrs process it throws a TypeError
console.log("Note error from fetch might be misleading especially TypeError can be Cors issue:",httpurl);
if (err instanceof errors.TransportError) {
throw err;
} else {
throw new errors.TransportError(`Transport error thrown by ${httpurl}: ${err.message}`);
}
}
}
async p_GET(httpurl, opts={}) {
/* Locate and return a block, based on its url
Throws TransportError if fails
opts {
start, end, // Range of bytes wanted - inclusive i.e. 0,1023 is 1024 bytes
verbose }
resolves to: URL that can be used to fetch the resource, of form contenthash:/contenthash/Q123
*/
let headers = new Headers();
if (opts.start || opts.end) headers.append("range", `bytes=${opts.start || 0}-${opts.end || ""}`);
let init = { //https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
method: 'GET',
headers: headers,
mode: 'cors',
cache: 'default',
redirect: 'follow', // Chrome defaults to manual
keepalive: true // Keep alive - mostly we'll be going back to same places a lot
};
return await this.p_httpfetch(httpurl, init, opts.verbose); // This s a real http url
}
async p_POST(httpurl, type, data, verbose) {
// Locate and return a block, based on its url
// Throws TransportError if fails
//let headers = new window.Headers();
//headers.set('content-type',type); Doesn't work, it ignores it
let init = {
//https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
//https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name for headers tat cant be set
method: 'POST',
headers: {}, //headers,
//body: new Buffer(data),
body: data,
mode: 'cors',
cache: 'default',
redirect: 'follow', // Chrome defaults to manual
keepalive: true // Keep alive - mostly we'll be going back to same places a lot
};
return await this.p_httpfetch(httpurl, init, verbose);
}
_cmdurl(command) {
return `${this.urlbase}/${command}`
}
_url(url, command, parmstr) {
if (!url) throw new errors.CodingError(`${command}: requires url`);
if (typeof url !== "string") { url = url.href }
url = url.replace('contenthash:/contenthash', this._cmdurl(command)) ; // Note leaves http: and https: urls unchanged
url = url.replace('getall/table', command);
url = url + (parmstr ? "?"+parmstr : "");
return url;
}
async p_rawfetch(url, opts={}) {
/*
Fetch from underlying transport,
Fetch is used both for contenthash requests and table as when passed to SmartDict.p_fetch may not know what we have
url: Of resource - which is turned into the HTTP url in p_httpfetch
opts: {start, end, verbose} see p_GET for documentation
throws: TransportError if fails
*/
//if (!(url && url.includes(':') ))
// throw new errors.CodingError("TransportHTTP.p_rawfetch bad url: "+url);
if (((typeof url === "string") ? url : url.href).includes('/getall/table')) {
console.log("XXX@176 - probably dont want to be calling p_rawfetch on a KeyValueTable, especially since dont know if its keyvaluetable or subclass"); //TODO-NAMING
return {
table: "keyvaluetable",
}
} else {
return await this.p_GET(this._url(url, servercommands.rawfetch), opts);
}
}
p_rawlist(url, verbose) {
// obj being loaded
// Locate and return a block, based on its url
if (!url) throw new errors.CodingError("TransportHTTP.p_rawlist: requires url");
return this.p_GET(this._url(url, servercommands.rawlist), {verbose});
}
rawreverse() { throw new errors.ToBeImplementedError("Undefined function TransportHTTP.rawreverse"); }
async p_rawstore(data, verbose) {
/*
Store data on http server,
data: string
resolves to: {string}: url
throws: TransportError on failure in p_POST > p_httpfetch
*/
//PY: res = self._sendGetPost(True, "rawstore", headers={"Content-Type": "application/octet-stream"}, urlargs=[], data=data, verbose=verbose)
console.assert(data, "TransportHttp.p_rawstore: requires data");
let res = await this.p_POST(this._cmdurl(servercommands.rawstore), "application/octet-stream", data, verbose); // resolves to URL
let parsedurl = Url.parse(res);
let pathparts = parsedurl.pathname.split('/');
return `contenthash:/contenthash/${pathparts.slice(-1)}`
}
p_rawadd(url, sig, verbose) { //TODO-BACKPORT turn date into ISO before adding
//verbose=true;
if (!url || !sig) throw new errors.CodingError("TransportHTTP.p_rawadd: invalid parms",url, sig);
if (verbose) console.log("rawadd", url, sig);
let value = JSON.stringify(sig.preflight(Object.assign({},sig)))+"\n";
return this.p_POST(this._url(url, servercommands.rawadd), "application/json", value, verbose); // Returns immediately
}
p_newlisturls(cl, verbose) {
let u = cl._publicurls.map(urlstr => Url.parse(urlstr))
.find(parsedurl =>
(parsedurl.protocol === "https" && parsedurl.host === "gateway.dweb.me" && parsedurl.pathname.includes('/content/rawfetch'))
|| (parsedurl.protocol === "contenthash:" && (parsedurl.pathname.split('/')[1] === "contenthash")));
if (!u) {
u = `contenthash:/contenthash/${ cl.keypair.verifyexportmultihashsha256_58() }`; // Pretty random, but means same test will generate same list and server is expecting base58 of a hash
}
return [u,u];
}
// ============================== Key Value support
// Support for Key-Value pairs as per
// https://docs.google.com/document/d/1yfmLRqKPxKwB939wIy9sSaa7GKOzM5PrCZ4W1jRGW6M/edit#
async p_newdatabase(pubkey, verbose) {
//if (pubkey instanceof Dweb.PublicPrivate)
if (pubkey.hasOwnProperty("keypair"))
pubkey = pubkey.keypair.signingexport()
// By this point pubkey should be an export of a public key of form xyz:abc where xyz
// specifies the type of public key (NACL VERIFY being the only kind we expect currently)
let u = `${this.urlbase}/getall/table/${encodeURIComponent(pubkey)}`;
return {"publicurl": u, "privateurl": u};
}
async p_newtable(pubkey, table, verbose) {
if (!pubkey) throw new errors.CodingError("p_newtable currently requires a pubkey");
let database = await this.p_newdatabase(pubkey, verbose);
// If have use cases without a database, then call p_newdatabase first
return { privateurl: `${database.privateurl}/${table}`, publicurl: `${database.publicurl}/${table}`} // No action required to create it
}
//TODO-KEYVALUE needs signing with private key of list
async p_set(url, keyvalues, value, verbose) { // url = yjs:/yjs/database/table/key //TODO-KEYVALUE-API
if (!url || !keyvalues) throw new errors.CodingError("TransportHTTP.p_set: invalid parms",url, keyvalyes);
if (verbose) console.log("p_set", url, keyvalues, value);
if (typeof keyvalues === "string") {
let kv = JSON.stringify([{key: keyvalues, value: value}]);
await this.p_POST(this._url(url, servercommands.set), "application/json", kv, verbose); // Returns immediately
} else {
let kv = JSON.stringify(Object.keys(keyvalues).map((k) => ({"key": k, "value": keyvalues[k]})));
await this.p_POST(this._url(url, servercommands.set), "application/json", kv, verbose); // Returns immediately
}
}
_keyparm(key) {
return `key=${encodeURIComponent(key)}`
}
//TODO-KEYALUE got to here on KEYVALUE in HTTP
async p_get(url, keys, verbose) {
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
let parmstr =Array.isArray(keys) ? keys.map(k => this._keyparm(k)).join('&') : this._keyparm(keys)
let res = await this.p_GET(this._url(url, servercommands.get, parmstr), {verbose});
return Array.isArray(keys) ? res : res[keys]
}
async p_delete(url, keys, verbose) { //TODO-KEYVALUE-API need to think this one through
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
let parmstr = keys.map(k => this._keyparm(k)).join('&');
await this.p_GET(this._url(url, servercommands.delete, parmstr), {verbose});
}
async p_keys(url, verbose) {
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
return await this.p_GET(this._url(url, servercommands.keys), {verbose});
}
async p_getall(url, verbose) {
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
return await this.p_GET(this._url(url, servercommands.getall), {verbose});
}
/* Make sure doesnt shadow regular p_rawfetch
async p_rawfetch(url, verbose) {
return {
table: "keyvaluetable",
_map: await this.p_getall(url, verbose)
}; // Data struc is ok as SmartDict.p_fetch will pass to KVT constructor
}
*/
p_info(verbose) { return this.p_GET(`${this.urlbase}/info`, {verbose}); } //TODO-BACKPORT
static async p_test(opts={}, verbose=false) {
if (verbose) {console.log("TransportHTTP.test")}
try {
let transport = await this.p_setup(opts, verbose);
if (verbose) console.log("HTTP connected");
let res = await transport.p_info(verbose);
if (verbose) console.log("TransportHTTP info=",res);
res = await transport.p_status(verbose);
console.assert(res === Transport.STATUS_CONNECTED);
await transport.p_test_kvt("NACL%20VERIFY", verbose);
} catch(err) {
console.log("Exception thrown in TransportHTTP.test:", err.message);
throw err;
}
}
static async test() {
return this;
}
}
Transports._transportclasses["HTTP"] = TransportHTTP;
exports = module.exports = TransportHTTP;

371
src/TransportIPFS.js Normal file
View File

@ -0,0 +1,371 @@
/*
This is a shim to the IPFS library, (Lists are handled in YJS or OrbitDB)
See https://github.com/ipfs/js-ipfs but note its often out of date relative to the generic API doc.
*/
// IPFS components
const IPFS = require('ipfs');
const CID = require('cids');
// noinspection NpmUsedModulesInstalled
const dagPB = require('ipld-dag-pb');
// noinspection Annotator
const DAGNode = dagPB.DAGNode; // So can check its type
const unixFs = require('ipfs-unixfs');
// Library packages other than IPFS
const Url = require('url');
const stream = require('readable-stream'); // Needed for the pullthrough - this is NOT Ipfs streams
// Alternative to through - as used in WebTorrent
// Utility packages (ours) And one-liners
//No longer reqd: const promisify = require('promisify-es6');
//const makepromises = require('./utils/makepromises'); // Replaced by direct call to promisify
// Other Dweb modules
const errors = require('./Errors'); // Standard Dweb Errors
const Transport = require('./Transport.js'); // Base class for TransportXyz
const Transports = require('./Transports'); // Manage all Transports that are loaded
const utils = require('./utils'); // Utility functions
const defaultoptions = {
ipfs: {
repo: '/tmp/dweb_ipfsv2700', //TODO-IPFS think through where, esp for browser
//init: false,
//start: false,
//TODO-IPFS-Q how is this decentralized - can it run offline? Does it depend on star-signal.cloud.ipfs.team
config: {
// Addresses: { Swarm: [ '/dns4/star-signal.cloud.ipfs.team/wss/p2p-webrtc-star']}, // For Y - same as defaults
// Addresses: { Swarm: [ ] }, // Disable WebRTC to test browser crash, note disables Y so doesnt work.
Addresses: {Swarm: ['/dns4/ws-star.discovery.libp2p.io/tcp/443/wss/p2p-websocket-star']}, // from https://github.com/ipfs/js-ipfs#faq 2017-12-05 as alternative to webrtc
},
//init: true, // Comment out for Y
EXPERIMENTAL: {
pubsub: true
}
}
};
class TransportIPFS extends Transport {
/*
IPFS specific transport
Fields:
ipfs: object returned when starting IPFS
yarray: object returned when starting yarray
*/
constructor(options, verbose) {
super(options, verbose);
this.ipfs = undefined; // Undefined till start IPFS
this.options = options; // Dictionary of options { ipfs: {...}, "yarrays", yarray: {...} }
this.name = "IPFS"; // For console log etc
this.supportURLs = ['ipfs'];
this.supportFunctions = ['fetch', 'store']; // Does not support reverse, createReadStream fails on files uploaded with urlstore TODO reenable when Kyle fixes urlstore
this.status = Transport.STATUS_LOADED;
}
/*
_makepromises() {
//Utility function to promisify Block
//Replaced promisified utility since only two to promisify
//this.promisified = {ipfs:{}};
//makepromises(this.ipfs, this.promisified.ipfs, [ { block: ["put", "get"] }]); // Has to be after this.ipfs defined
this.promisified = { ipfs: { block: {
put: promisify(this.ipfs.block.put),
get: promisify(this.ipfs.block.get)
}}}
}
*/
p_ipfsstart(verbose) {
/*
Just start IPFS - not Y (note used with "yarrays" and will be used for non-IPFS list management)
Note - can't figure out how to use async with this, as we resolve the promise based on the event callback
*/
const self = this;
return new Promise((resolve, reject) => {
this.ipfs = new IPFS(this.options.ipfs);
this.ipfs.on('ready', () => {
//this._makepromises();
resolve();
});
this.ipfs.on('error', (err) => reject(err));
})
.then(() => self.ipfs.version())
.then((version) => console.log('IPFS READY',version))
.catch((err) => {
console.log("Error caught in p_ipfsstart");
throw(err);
});
}
static setup0(options, verbose) {
/*
First part of setup, create obj, add to Transports but dont attempt to connect, typically called instead of p_setup if want to parallelize connections.
*/
const combinedoptions = Transport.mergeoptions(defaultoptions, options);
if (verbose) console.log("IPFS loading options %o", combinedoptions);
const t = new TransportIPFS(combinedoptions, verbose); // Note doesnt start IPFS
Transports.addtransport(t);
return t;
}
async p_setup1(verbose) {
try {
if (verbose) console.log("IPFS starting and connecting");
this.status = Transport.STATUS_STARTING; // Should display, but probably not refreshed in most case
await this.p_ipfsstart(verbose); // Throws Error("websocket error") and possibly others.
this.status = (await this.ipfs.isOnline()) ? Transport.STATUS_CONNECTED : Transport.STATUS_FAILED;
} catch(err) {
console.error("IPFS failed to connect",err);
this.status = Transport.STATUS_FAILED;
}
return this;
}
async p_status(verbose) {
/*
Return a string for the status of a transport. No particular format, but keep it short as it will probably be in a small area of the screen.
*/
this.status = (await this.ipfs.isOnline()) ? Transport.STATUS_CONNECTED : Transport.STATUS_FAILED;
return this.status;
}
// Everything else - unless documented here - should be opaque to the actual structure of a CID
// or a url. This code may change as its not clear (from IPFS docs) if this is the right mapping.
static urlFrom(unknown) {
/*
Convert a CID into a standardised URL e.g. ipfs:/ipfs/abc123
*/
if (unknown instanceof CID)
return "ipfs:/ipfs/"+unknown.toBaseEncodedString();
if (typeof unknown === "object" && unknown.hash) // e.g. from files.add
return "ipfs:/ipfs/"+unknown.hash;
if (typeof unknown === "string") // Not used currently
return "ipfs:/ipfs/"+unknown;
throw new errors.CodingError("TransportIPFS.urlFrom: Cant convert to url from",unknown);
}
static cidFrom(url) {
/*
Convert a URL e.g. ipfs:/ipfs/abc123 into a CID structure suitable for retrieval
url: String of form "ipfs://ipfs/<hash>" or parsed URL or CID
returns: CID
throws: TransportError if cant convert
*/
if (url instanceof CID) return url;
if (typeof(url) === "string") url = Url.parse(url);
if (url && url["pathname"]) { // On browser "instanceof Url" isn't valid)
const patharr = url.pathname.split('/');
if ((url.protocol !== "ipfs:") || (patharr[1] !== 'ipfs') || (patharr.length < 3))
throw new errors.TransportError("TransportIPFS.cidFrom bad format for url should be ipfs:/ipfs/...: " + url.href);
if (patharr.length > 3)
throw new errors.TransportError("TransportIPFS.cidFrom not supporting paths in url yet, should be ipfs:/ipfs/...: " + url.href);
return new CID(patharr[2]);
} else {
throw new errors.CodingError("TransportIPFS.cidFrom: Cant convert url",url);
}
}
static ipfsFrom(url) {
/*
Convert to a ipfspath i.e. /ipfs/Qm....
Required because of strange differences in APIs between files.cat and dag.get see https://github.com/ipfs/js-ipfs/issues/1229
*/
if (url instanceof CID)
return "/ipfs/"+url.toBaseEncodedString();
if (typeof(url) !== "string") { // It better be URL which unfortunately is hard to test
url = url.path;
}
if (url.indexOf('/ipfs/') > -1) {
return url.slice(url.indexOf('/ipfs/'));
}
throw new errors.CodingError(`TransportIPFS.ipfsFrom: Cant convert url ${url} into a path starting /ipfs/`);
}
static multihashFrom(url) {
if (url instanceof CID)
return cid.toBaseEncodedString();
if (typeof url === 'object' && url.path)
url = url.path; // /ipfs/Q...
if (typeof(url) === "string") {
const idx = url.indexOf("/ipfs/");
if (idx > -1) {
return url.slice(idx+6);
}
}
throw new errors.CodingError(`Cant turn ${url} into a multihash`);
}
async p_rawfetch(url, {verbose=false, timeoutMS=60000, relay=false}={}) {
/*
Fetch some bytes based on a url of the form ipfs:/ipfs/Qm..... or ipfs:/ipfs/z.... .
No assumption is made about the data in terms of size or structure, nor can we know whether it was created with dag.put or ipfs add or http /api/v0/add/
Where required by the underlying transport it should retrieve a number if its "blocks" and concatenate them.
Returns a new Promise that resolves currently to a string.
There may also be need for a streaming version of this call, at this point undefined since we havent (currently) got a use case..
:param string url: URL of object being retrieved
:param boolean verbose: true for debugging output
:resolve buffer: Return the object being fetched. (may in the future return a stream and buffer externally)
:throws: TransportError if url invalid - note this happens immediately, not as a catch in the promise
*/
if (verbose) console.log("IPFS p_rawfetch", utils.stringfrom(url));
if (!url) throw new errors.CodingError("TransportIPFS.p_rawfetch: requires url");
const cid = TransportIPFS.cidFrom(url); // Throws TransportError if url bad
const ipfspath = TransportIPFS.ipfsFrom(url) // Need because dag.get has different requirement than file.cat
try {
const res = await utils.p_timeout(this.ipfs.dag.get(cid), timeoutMS);
// noinspection Annotator
if (res.remainderPath.length)
{ // noinspection ExceptionCaughtLocallyJS
throw new errors.TransportError("Not yet supporting paths in p_rawfetch");
} //TODO-PATH
let buff;
if (res.value instanceof DAGNode) { // Its file or something added with the HTTP API for example, TODO not yet handling multiple files
if (verbose) console.log("IPFS p_rawfetch looks like its a file", url);
//console.log("Case a or b" - we can tell the difference by looking at (res.value._links.length > 0) but dont need to
// as since we dont know if we are on node or browser best way is to try the files.cat and if it fails try the block to get an approximate file);
// Works on Node, but fails on Chrome, cant figure out how to get data from the DAGNode otherwise (its the wrong size)
buff = await this.ipfs.files.cat(ipfspath); //See js-ipfs v0.27 version and https://github.com/ipfs/js-ipfs/issues/1229 and https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/FILES.md#cat
/* Was needed on v0.26, not on v0.27
if (buff.length === 0) { // Hit the Chrome bug
// This will get a file padded with ~14 bytes - 4 at front, 4 at end and cant find the other 6 !
// but it seems to work for PDFs which is what I'm testing on.
if (verbose) console.log("Kludge alert - files.cat fails in Chrome, trying block.get");
let blk = await this.promisified.ipfs.block.get(cid);
buff = blk.data;
}
END of v0.26 version */
} else { //c: not a file
buff = res.value;
}
if (verbose) console.log(`IPFS fetched ${buff.length} from ${ipfspath}`);
return buff;
} catch (err) {
console.log("Caught misc error in TransportIPFS.p_rawfetch");
throw err;
}
}
async p_rawstore(data, verbose) {
/*
Store a blob of data onto the decentralised transport.
Returns a promise that resolves to the url of the data
:param string|Buffer data: Data to store - no assumptions made to size or content
:param boolean verbose: true for debugging output
:resolve string: url of data stored
*/
console.assert(data, "TransportIPFS.p_rawstore: requires data");
const buf = (data instanceof Buffer) ? data : new Buffer(data);
//return this.promisified.ipfs.block.put(buf).then((block) => block.cid)
//https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/DAG.md#dagput
//let res = await this.ipfs.dag.put(buf,{ format: 'dag-cbor', hashAlg: 'sha2-256' });
const res = (await this.ipfs.files.add(buf,{ "cid-version": 1, hashAlg: 'sha2-256'}))[0];
//TODO-IPFS has been suggested to move this to files.add with no filename.
return TransportIPFS.urlFrom(res);
//return this.ipfs.files.put(buf).then((block) => TransportIPFS.urlFrom(block.cid));
}
// Based on https://github.com/ipfs/js-ipfs/pull/1231/files
async p_offsetStream(stream, links, startByte, endByte) {
let streamPosition = 0
try {
for (let l in links) {
const link = links[l];
if (!stream.writable) { return } // The stream has been closed
// DAGNode Links report unixfs object data sizes 14 bytes larger due to the protobuf wrapper
const bytesInLinkedObjectData = link.size - 14
if (startByte > (streamPosition + bytesInLinkedObjectData)) {
// Start byte is after this block so skip it
streamPosition += bytesInLinkedObjectData;
} else if (endByte && endByte < streamPosition) { // TODO-STREAM this is copied from https://github.com/ipfs/js-ipfs/pull/1231/files but I think it should be endByte <= since endByte is first byte DONT want
// End byte was before this block so skip it
streamPosition += bytesInLinkedObjectData;
} else {
let lmh = link.multihash;
let data;
await this.ipfs.object.data(lmh)
.then ((d) => unixFs.unmarshal(d).data)
.then ((d) => data = d )
.catch((err) => {console.log("XXX@289 err=",err);});
if (!stream.writable) { return; } // The stream was closed while we were getting data
const length = data.length;
if (startByte > streamPosition && startByte < (streamPosition + length)) {
// If the startByte is in the current block, skip to the startByte
data = data.slice(startByte - streamPosition);
}
console.log(`Writing ${data.length} to stream`)
stream.write(data);
streamPosition += length;
}
}
} catch(err) {
console.log(err.message);
}
}
async p_f_createReadStream(url, verbose=false) { // Asynchronously return a function that can be used in createReadStream TODO-API
verbose = true;
if (verbose) console.log("p_f_createReadStream",url);
const mh = TransportIPFS.multihashFrom(url);
const links = await this.ipfs.object.links(mh)
let throughstream; //Holds pointer to stream between calls.
const self = this;
function crs(opts) { // This is a synchronous function
// Return a readable stream that provides the bytes between offsets "start" and "end" inclusive
console.log("opts=",JSON.stringify(opts));
/* Can replace rest of crs with this when https://github.com/ipfs/js-ipfs/pull/1231/files lands (hopefully v0.28.3)
return self.ipfs.catReadableStream(mh, opts ? opts.start : 0, opts && opts.end) ? opts.end+1 : undefined)
*/
if (!opts) return throughstream; //TODO-STREAM unclear why called without opts - take this out when figured out
if (throughstream && throughstream.destroy) throughstream.destroy();
throughstream = new stream.PassThrough();
self.p_offsetStream( // Ignore promise returned, this will right to the stream asynchronously
throughstream,
links, // Uses the array of links created above in this function
opts ? opts.start : 0,
(opts && opts.end) ? opts.end : undefined);
return throughstream;
}
return crs;
}
static async p_test(opts, verbose) {
if (verbose) {console.log("TransportIPFS.test")}
try {
const transport = await this.p_setup(opts, verbose); // Assumes IPFS already setup
if (verbose) console.log(transport.name,"setup");
const res = await transport.p_status(verbose);
console.assert(res === Transport.STATUS_CONNECTED)
let urlqbf;
const qbf = "The quick brown fox";
const qbf_url = "ipfs:/ipfs/zdpuAscRnisRkYnEyJAp1LydQ3po25rCEDPPEDMymYRfN1yPK"; // Expected url
const testurl = "1114"; // Just a predictable number can work with
const url = await transport.p_rawstore(qbf, verbose);
if (verbose) console.log("rawstore returned", url);
const newcid = TransportIPFS.cidFrom(url); // Its a CID which has a buffer in it
console.assert(url === qbf_url, "url should match url from rawstore");
const cidmultihash = url.split('/')[2]; // Store cid from first block in form of multihash
const newurl = TransportIPFS.urlFrom(newcid);
console.assert(url === newurl, "Should round trip");
urlqbf = url;
const data = await transport.p_rawfetch(urlqbf, {verbose});
console.assert(data.toString() === qbf, "Should fetch block stored above");
//console.log("TransportIPFS test complete");
return transport
} catch(err) {
console.log("Exception thrown in TransportIPFS.test:", err.message);
throw err;
}
}
}
Transports._transportclasses["IPFS"] = TransportIPFS;
exports = module.exports = TransportIPFS;

293
src/TransportWEBTORRENT.js Normal file
View File

@ -0,0 +1,293 @@
/*
This Transport layers builds on WebTorrent
Y Lists have listeners and generate events - see docs at ...
*/
// WebTorrent components
const WebTorrent = require('webtorrent');
const stream = require('readable-stream');
// Other Dweb modules
const errors = require('./Errors'); // Standard Dweb Errors
const Transport = require('./Transport.js'); // Base class for TransportXyz
const Transports = require('./Transports'); // Manage all Transports that are loaded
let defaultoptions = {
webtorrent: {}
};
class TransportWEBTORRENT extends Transport {
/*
WebTorrent specific transport
Fields:
webtorrent: object returned when starting webtorrent
*/
constructor(options, verbose) {
super(options, verbose);
this.webtorrent = undefined; // Undefined till start WebTorrent
this.options = options; // Dictionary of options
this.name = "WEBTORRENT"; // For console log etc
this.supportURLs = ['magnet'];
this.supportFunctions = ['fetch', 'createReadStream'];
this.status = Transport.STATUS_LOADED;
}
p_webtorrentstart(verbose) {
/*
Start WebTorrent and wait until for ready.
*/
let self = this;
return new Promise((resolve, reject) => {
this.webtorrent = new WebTorrent(this.options.webtorrent);
this.webtorrent.once("ready", () => {
console.log("WEBTORRENT READY");
resolve();
});
this.webtorrent.once("error", (err) => reject(err));
this.webtorrent.on("warning", (err) => {
console.warn("WebTorrent Torrent WARNING: " + err.message);
});
})
}
static setup0(options, verbose) {
/*
First part of setup, create obj, add to Transports but dont attempt to connect, typically called instead of p_setup if want to parallelize connections.
*/
let combinedoptions = Transport.mergeoptions(defaultoptions, options);
console.log("WebTorrent options %o", combinedoptions);
let t = new TransportWEBTORRENT(combinedoptions, verbose);
Transports.addtransport(t);
return t;
}
async p_setup1(verbose) {
try {
this.status = Transport.STATUS_STARTING;
await this.p_webtorrentstart(verbose);
} catch(err) {
console.error("WebTorrent failed to connect",err);
this.status = Transport.STATUS_FAILED;
}
return this;
}
async p_status(verbose) {
/*
Return a string for the status of a transport. No particular format, but keep it short as it will probably be in a small area of the screen.
*/
if (this.webtorrent && this.webtorrent.ready) {
this.status = Transport.STATUS_CONNECTED;
} else if (this.webtorrent) {
this.status = Transport.STATUS_STARTING;
} else {
this.status = Transport.STATUS_FAILED;
}
return this.status;
}
webtorrentparseurl(url) {
/* Parse a URL
url: URL as string or already parsed into Url
returns: torrentid, path
*/
if (!url) {
throw new errors.CodingError("TransportWEBTORRENT.p_rawfetch: requires url");
}
const urlstring = typeof url === "string" ? url : url.href
const index = urlstring.indexOf('/');
if (index === -1) {
throw new errors.CodingError("TransportWEBTORRENT.p_rawfetch: invalid url - missing path component. Should look like magnet:xyzabc/path/to/file");
}
const torrentId = urlstring.slice(0, index);
const path = urlstring.slice(index + 1);
return { torrentId, path }
}
async p_webtorrentadd(torrentId) {
return new Promise((resolve, reject) => {
// Check if this torrentId is already added to the webtorrent client
let torrent = this.webtorrent.get(torrentId);
// If not, then add the torrentId to the torrent client
if (!torrent) {
torrent = this.webtorrent.add(torrentId);
torrent.once("error", (err) => {
reject(new errors.TransportError("Torrent encountered a fatal error " + err.message));
});
torrent.on("warning", (err) => {
console.warn("WebTorrent Torrent WARNING: " + err.message + " (" + torrent.name + ")");
});
}
if (torrent.ready) {
resolve(torrent);
} else {
torrent.once("ready", () => {
resolve(torrent);
});
}
if (typeof window !== "undefined") { // Check running in browser
window.WEBTORRENT_TORRENT = torrent;
torrent.once('close', () => {
window.WEBTORRENT_TORRENT = null
})
}
});
}
webtorrentfindfile (torrent, path) {
/*
Given a torrent object and a path to a file within the torrent, find the given file.
*/
const filePath = torrent.name + '/' + path;
const file = torrent.files.find(file => {
return file.path === filePath;
});
if (!file) {
//debugger;
throw new errors.TransportError("Requested file (" + path + ") not found within torrent ");
}
return file;
}
p_rawfetch(url, {verbose=false}={}) {
/*
Fetch some bytes based on a url of the form:
magnet:xyzabc/path/to/file
(Where xyzabc is the typical magnet uri contents)
No assumption is made about the data in terms of size or structure. Returns a new Promise that resolves to a buffer.
:param string url: URL of object being retrieved
:param boolean verbose: true for debugging output
:resolve buffer: Return the object being fetched.
:throws: TransportError if url invalid - note this happens immediately, not as a catch in the promise
*/
return new Promise((resolve, reject) => {
if (verbose) console.log("WebTorrent p_rawfetch", url);
const { torrentId, path } = this.webtorrentparseurl(url);
this.p_webtorrentadd(torrentId)
.then((torrent) => {
torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want
const file = this.webtorrentfindfile(torrent, path);
file.getBuffer((err, buffer) => {
if (err) {
return reject(new errors.TransportError("Torrent encountered a fatal error " + err.message + " (" + torrent.name + ")"));
}
resolve(buffer);
});
})
.catch((err) => reject(err));
});
}
async p_f_createReadStream(url, verbose) { //TODO-API
if (verbose) console.log("TransportWEBTORRENT p_f_createreadstream %o", url);
try {
const {torrentId, path} = this.webtorrentparseurl(url);
let torrent = await this.p_webtorrentadd(torrentId);
let filet = this.webtorrentfindfile(torrent, path);
let self = this;
return function (opts) {
return self.createReadStream(filet, opts, verbose);
};
} catch(err) {
console.log(`p_f_createReadStream failed on ${url} ${err.message}`);
throw(err);
};
}
createReadStream(file, opts, verbose) {
/*
Fetch bytes progressively, using a node.js readable stream, based on a url of the form:
magnet:xyzabc/path/to/file
(Where xyzabc is the typical magnet uri contents)
No assumption is made about the data in terms of size or structure. Returns a new Promise that resolves to a node.js readable stream.
Node.js readable stream docs:
https://nodejs.org/api/stream.html#stream_readable_streams
:param string url: URL of object being retrieved
:param boolean verbose: true for debugging output
:returns stream: The readable stream.
:throws: TransportError if url invalid - note this happens immediately, not as a catch in the promise
*/
if (verbose) console.log("TransportWEBTORRENT createreadstream %o %o", file.name, opts);
try {
const through = new stream.PassThrough();
const fileStream = file.createReadStream(opts);
fileStream.pipe(through);
return through;
} catch(err) {
if (typeof through.destroy === 'function') through.destroy(err)
else through.emit('error', err)
};
}
static async p_test(opts, verbose) {
try {
let transport = await this.p_setup(opts, verbose); // Assumes IPFS already setup
if (verbose) console.log(transport.name, "setup");
let res = await transport.p_status(verbose);
console.assert(res === Transport.STATUS_CONNECTED)
// Creative commons torrent, copied from https://webtorrent.io/free-torrents
let bigBuckBunny = 'magnet:?xt=urn:btih:dd8255ecdc7ca55fb0bbf81323d87062db1f6d1c&dn=Big+Buck+Bunny&tr=udp%3A%2F%2Fexplodie.org%3A6969&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.empire-js.us%3A1337&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337&tr=wss%3A%2F%2Ftracker.btorrent.xyz&tr=wss%3A%2F%2Ftracker.fastcast.nz&tr=wss%3A%2F%2Ftracker.openwebtorrent.com&ws=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2F&xs=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2Fbig-buck-bunny.torrent/Big Buck Bunny.en.srt';
let data1 = await transport.p_rawfetch(bigBuckBunny, {verbose});
data1 = data1.toString();
assertData(data1);
const stream = await transport.createReadStream(bigBuckBunny, verbose);
const chunks = [];
stream.on("data", (chunk) => {
chunks.push(chunk);
});
stream.on("end", () => {
const data2 = Buffer.concat(chunks).toString();
assertData(data2);
});
function assertData(data) {
// Test for a string that is contained within the file
let expectedWithinData = "00:00:02,000 --> 00:00:05,000";
console.assert(data.indexOf(expectedWithinData) !== -1, "Should fetch 'Big Buck Bunny.en.srt' from the torrent");
// Test that the length is what we expect
console.assert(data.length, 129, "'Big Buck Bunny.en.srt' was " + data.length);
}
} catch (err) {
console.log("Exception thrown in TransportWEBTORRENT.p_test:", err.message);
throw err;
}
}
}
Transports._transportclasses["WEBTORRENT"] = TransportWEBTORRENT;
exports = module.exports = TransportWEBTORRENT;

335
src/TransportYJS.js Normal file
View File

@ -0,0 +1,335 @@
/*
This Transport layers builds on the YJS DB and uses IPFS as its transport.
Y Lists have listeners and generate events - see docs at ...
*/
const Url = require('url');
//const Y = require('yjs/dist/y.js'); // Explicity require of dist/y.js to get around a webpack warning but causes different error in YJS
const Y = require('yjs'); // Explicity require of dist/y.js to get around a webpack warning
require('y-memory')(Y);
require('y-array')(Y);
require('y-text')(Y);
require('y-map')(Y);
require('y-ipfs-connector')(Y);
require('y-indexeddb')(Y);
//require('y-leveldb')(Y); //- can't be there for browser, node seems to find it ok without this, though not sure why..
// Utility packages (ours) And one-liners
function delay(ms, val) { return new Promise(resolve => {setTimeout(() => { resolve(val); },ms)})}
// Other Dweb modules
const errors = require('./Errors'); // Standard Dweb Errors
const Transport = require('./Transport.js'); // Base class for TransportXyz
const Transports = require('./Transports'); // Manage all Transports that are loaded
const utils = require('./utils'); // Utility functions
let defaultoptions = {
yarray: { // Based on how IIIF uses them in bootstrap.js in ipfs-iiif-db repo
db: {
name: 'indexeddb', // leveldb in node
},
connector: {
name: 'ipfs',
//ipfs: ipfs, // Need to link IPFS here once created
},
}
};
class TransportYJS extends Transport {
/*
YJS specific transport - over IPFS, but could probably use other YJS transports
Fields:
ipfs: object returned when starting IPFS
yarray: object returned when starting yarray
*/
constructor(options, verbose) {
super(options, verbose);
this.options = options; // Dictionary of options { ipfs: {...}, "yarrays", yarray: {...} }
this.name = "YJS"; // For console log etc
this.supportURLs = ['yjs'];
this.supportFunctions = ['fetch', 'add', 'list', 'listmonitor', 'newlisturls',
'connection', 'get', 'set', 'getall', 'keys', 'newdatabase', 'newtable', 'monitor']; // Only does list functions, Does not support reverse,
this.status = Transport.STATUS_LOADED;
}
async p__y(url, opts, verbose) {
/*
Utility function to get Y for this URL with appropriate options and open a new connection if not already
url: URL string to find list of
opts: Options to add to defaults
resolves: Y
*/
if (!(typeof(url) === "string")) { url = url.href; } // Convert if its a parsed URL
console.assert(url.startsWith("yjs:/yjs/"));
try {
if (this.yarrays[url]) {
if (verbose) console.log("Found Y for", url);
return this.yarrays[url];
} else {
let options = Transport.mergeoptions(this.options.yarray, {connector: {room: url}}, opts); // Copies options, ipfs will be set already
if (verbose) console.log("Creating Y for", url); //"options=",options);
return this.yarrays[url] = await Y(options);
}
} catch(err) {
console.log("Failed to initialize Y");
throw err;
}
}
async p__yarray(url, verbose) {
/*
Utility function to get Yarray for this URL and open a new connection if not already
url: URL string to find list of
resolves: Y
*/
return this.p__y(url, { share: {array: "Array"}}); // Copies options, ipfs will be set already
}
async p_connection(url, verbose) {
/*
Utility function to get Yarray for this URL and open a new connection if not already
url: URL string to find list of
resolves: Y - a connection to use for get's etc.
*/
return this.p__y(url, { share: {map: "Map"}}); // Copies options, ipfs will be set already
}
static setup0(options, verbose) {
/*
First part of setup, create obj, add to Transports but dont attempt to connect, typically called instead of p_setup if want to parallelize connections.
*/
let combinedoptions = Transport.mergeoptions(defaultoptions, options);
if (verbose) console.log("YJS options %o", combinedoptions); // Log even if !verbose
let t = new TransportYJS(combinedoptions, verbose); // Note doesnt start IPFS or Y
Transports.addtransport(t);
return t;
}
async p_setup2(verbose) {
/*
This sets up for Y connections, which are opened each time a resource is listed, added to, or listmonitored.
p_setup2 is defined because IPFS will have started during the p_setup1 phase.
Throws: Error("websocket error") if WiFi off, probably other errors if fails to connect
*/
try {
this.status = Transport.STATUS_STARTING; // Should display, but probably not refreshed in most case
this.options.yarray.connector.ipfs = Transports.ipfs(verbose).ipfs; // Find an IPFS to use (IPFS's should be starting in p_setup1)
this.yarrays = {};
} catch(err) {
console.error("YJS failed to start",err);
this.status = Transport.STATUS_FAILED;
}
return this;
}
async p_status(verbose) {
/*
Return a string for the status of a transport. No particular format, but keep it short as it will probably be in a small area of the screen.
For YJS, its online if IPFS is.
*/
this.status = (await this.options.yarray.connector.ipfs.isOnline()) ? Transport.STATUS_CONNECTED : Transport.STATUS_FAILED;
return this.status;
}
async p_rawlist(url, verbose) {
/*
Fetch all the objects in a list, these are identified by the url of the public key used for signing.
(Note this is the 'signedby' parameter of the p_rawadd call, not the 'url' parameter
Returns a promise that resolves to the list.
Each item of the list is a dict: {"url": url, "date": date, "signature": signature, "signedby": signedby}
List items may have other data (e.g. reference ids of underlying transport)
:param string url: String with the url that identifies the list.
:param boolean verbose: true for debugging output
:resolve array: An array of objects as stored on the list.
*/
try {
let y = await this.p__yarray(url, verbose);
let res = y.share.array.toArray();
// .filter((obj) => (obj.signedby.includes(url))); Cant filter since url is the YJS URL, not the URL of the CL that signed it. (upper layers verify, which filters)
if (verbose) console.log("p_rawlist found", ...utils.consolearr(res));
return res;
} catch(err) {
console.log("TransportYJS.p_rawlist failed",err.message);
throw(err);
}
}
listmonitor(url, callback, verbose) {
/*
Setup a callback called whenever an item is added to a list, typically it would be called immediately after a p_rawlist to get any more items not returned by p_rawlist.
:param url: string Identifier of list (as used by p_rawlist and "signedby" parameter of p_rawadd
:param callback: function(obj) Callback for each new item added to the list
obj is same format as p_rawlist or p_rawreverse
:param verbose: boolean - true for debugging output
*/
let y = this.yarrays[typeof url === "string" ? url : url.href];
console.assert(y,"Should always exist before calling listmonitor - async call p__yarray(url) to create");
y.share.array.observe((event) => {
if (event.type === 'insert') { // Currently ignoring deletions.
if (verbose) console.log('resources inserted', event.values);
//cant filter because url is YJS local, not signer, callback should filter
//event.values.filter((obj) => obj.signedby.includes(url)).map(callback);
event.values.map(callback);
}
})
}
rawreverse() {
/*
Similar to p_rawlist, but return the list item of all the places where the object url has been listed.
The url here corresponds to the "url" parameter of p_rawadd
Returns a promise that resolves to the list.
:param string url: String with the url that identifies the object put on a list.
:param boolean verbose: true for debugging output
:resolve array: An array of objects as stored on the list.
*/
//TODO-REVERSE this needs implementing once list structure on IPFS more certain
throw new errors.ToBeImplementedError("Undefined function TransportYJS.rawreverse"); }
async p_rawadd(url, sig, verbose) {
/*
Store a new list item, it should be stored so that it can be retrieved either by "signedby" (using p_rawlist) or
by "url" (with p_rawreverse). The underlying transport does not need to guarantee the signature,
an invalid item on a list should be rejected on higher layers.
:param string url: String identifying list to post to
:param Signature sig: Signature object containing at least:
date - date of signing in ISO format,
urls - array of urls for the object being signed
signature - verifiable signature of date+urls
signedby - urls of public key used for the signature
:param boolean verbose: true for debugging output
:resolve undefined:
*/
console.assert(url && sig.urls.length && sig.signature && sig.signedby.length, "TransportYJS.p_rawadd args", url, sig);
if (verbose) console.log("TransportYJS.p_rawadd", typeof url === "string" ? url : url.href, sig);
let value = sig.preflight(Object.assign({}, sig));
let y = await this.p__yarray(url, verbose);
y.share.array.push([value]);
}
p_newlisturls(cl, verbose) {
let u = cl._publicurls.map(urlstr => Url.parse(urlstr))
.find(parsedurl =>
(parsedurl.protocol === "ipfs" && parsedurl.pathname.includes('/ipfs/'))
|| (parsedurl.protocol === "yjs:"));
if (!u) {
u = `yjs:/yjs/${ cl.keypair.verifyexportmultihashsha256_58() }`; // Pretty random, but means same test will generate same list
}
return [u,u];
}
// Support for Key-Value pairs as per
// https://docs.google.com/document/d/1yfmLRqKPxKwB939wIy9sSaa7GKOzM5PrCZ4W1jRGW6M/edit#
async p_newdatabase(pubkey, verbose) {
//if (pubkey instanceof Dweb.PublicPrivate)
if (pubkey.hasOwnProperty("keypair"))
pubkey = pubkey.keypair.signingexport()
// By this point pubkey should be an export of a public key of form xyz:abc where xyz
// specifies the type of public key (NACL VERIFY being the only kind we expect currently)
let u = `yjs:/yjs/${encodeURIComponent(pubkey)}`;
return {"publicurl": u, "privateurl": u};
}
//TODO maybe change the listmonitor / monitor code for to use "on" and the structure of PP.events
//TODO but note https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy about Proxy which might be suitable, prob not as doesnt map well to lists
async p_newtable(pubkey, table, verbose) {
if (!pubkey) throw new errors.CodingError("p_newtable currently requires a pubkey");
let database = await this.p_newdatabase(pubkey, verbose);
// If have use cases without a database, then call p_newdatabase first
return { privateurl: `${database.privateurl}/${table}`, publicurl: `${database.publicurl}/${table}`} // No action required to create it
}
async p_set(url, keyvalues, value, verbose) { // url = yjs:/yjs/database/table/key //TODO-KEYVALUE-API
let y = await this.p_connection(url, verbose);
if (typeof keyvalues === "string") {
y.share.map.set(keyvalues, JSON.stringify(value));
} else {
Object.keys(keyvalues).map((key) => y.share.map.set(key, keyvalues[key]));
}
}
_p_get(y, keys, verbose) {
if (Array.isArray(keys)) {
return keys.reduce(function(previous, key) {
let val = y.share.map.get(key);
previous[key] = typeof val === "string" ? JSON.parse(val) : val; // Handle undefined
return previous;
}, {});
} else {
let val = y.share.map.get(keys);
return typeof val === "string" ? JSON.parse(val) : val; // Surprisingly this is sync, the p_connection should have synchronised
}
}
async p_get(url, keys, verbose) { //TODO-KEYVALUE-API - return dict or single
return this._p_get(await this.p_connection(url, verbose), keys);
}
async p_delete(url, keys, verbose) { //TODO-KEYVALUE-API
let y = await this.p_connection(url, verbose);
if (typeof keys === "string") {
y.share.map.delete(keys);
} else {
keys.map((key) => y.share.map.delete(key)); // Surprisingly this is sync, the p_connection should have synchronised
}
}
async p_keys(url, verbose) {
let y = await this.p_connection(url, verbose);
return y.share.map.keys(); // Surprisingly this is sync, the p_connection should have synchronised
}
async p_getall(url, verbose) {
let y = await this.p_connection(url, verbose);
let keys = y.share.map.keys(); // Surprisingly this is sync, the p_connection should have synchronised
return this._p_get(y, keys);
}
async p_rawfetch(url, {verbose=false}={}) {
return { // See identical structure in TransportHTTP
table: "keyvaluetable", //TODO-KEYVALUE its unclear if this is the best way, as maybe want to know the real type of table e.g. domain
_map: await this.p_getall(url, verbose)
}; // Data struc is ok as SmartDict.p_fetch will pass to KVT constructor
}
async monitor(url, callback, verbose) {
/*
Setup a callback called whenever an item is added to a list, typically it would be called immediately after a p_rawlist to get any more items not returned by p_rawlist.
Stack: KVT()|KVT.p_new => KVT.monitor => (a: Transports.monitor => YJS.monitor)(b: dispatchEvent)
:param url: string Identifier of list (as used by p_rawlist and "signedby" parameter of p_rawadd
:param callback: function({type, key, value}) Callback for each new item added to the list
:param verbose: boolean - true for debugging output
*/
url = typeof url === "string" ? url : url.href;
let y = this.yarrays[url];
if (!y) {
throw new errors.CodingError("Should always exist before calling monitor - async call p__yarray(url) to create");
}
y.share.map.observe((event) => {
if (['add','update'].includes(event.type)) { // Currently ignoring deletions.
if (verbose) console.log("YJS monitor:", url, event.type, event.name, event.value);
// ignores event.path (only in observeDeep) and event.object
if (!(event.type === "update" && event.oldValue === event.value)) {
// Dont trigger on update as seeing some loops with p_set
let newevent = {
"type": {"add": "set", "update": "set", "delete": "delete"}[event.type],
"value": JSON.parse(event.value),
"key": event.name,
};
callback(newevent);
}
}
})
}
}
TransportYJS.Y = Y; // Allow node tests to find it
Transports._transportclasses["YJS"] = TransportYJS;
exports = module.exports = TransportYJS;

522
src/Transports.js Normal file
View File

@ -0,0 +1,522 @@
const Url = require('url');
const errors = require('./Errors');
/*
Handles multiple transports, API should be (almost) the same as for an individual transport)
*/
class Transports {
constructor(options, verbose) {
if (verbose) console.log("Transports(%o)",options);
}
static _connected() {
/*
Get an array of transports that are connected, i.e. currently usable
*/
return this._transports.filter((t) => (!t.status));
}
static connectedNames() {
return this._connected().map(t => t.name);
}
static connectedNamesParm() {
return this.connectedNames().map(n => "transport="+n).join('&')
}
static validFor(urls, func, options) {
/*
Finds an array or Transports that can support this URL.
Excludes any transports whose status != 0 as they aren't connected
urls: Array of urls
func: Function to check support for: fetch, store, add, list, listmonitor, reverse - see supportFunctions on each Transport class
returns: Array of pairs of url & transport instance [ [ u1, t1], [u1, t2], [u2, t1]]
*/
console.assert((urls && urls[0]) || ["store", "newlisturls", "newdatabase", "newtable"].includes(func), "Transports.validFor failed - coding error - urls=", urls, "func=", func); // FOr debugging old calling patterns with [ undefined ]
if (!(urls && urls.length > 0)) {
return this._connected().filter((t) => (t.supports(undefined, func)))
.map((t) => [undefined, t]);
} else {
return [].concat(
...urls.map((url) => typeof url === 'string' ? Url.parse(url) : url) // parse URLs once
.map((url) =>
this._connected().filter((t) => (t.supports(url, func))) // [ t1, t2 ]
.map((t) => [url, t]))); // [[ u, t1], [u, t2]]
}
}
static http(verbose) {
// Find an http transport if it exists, so for example YJS can use it.
return Transports._connected().find((t) => t.name === "HTTP")
}
static ipfs(verbose) {
// Find an ipfs transport if it exists, so for example YJS can use it.
return Transports._connected().find((t) => t.name === "IPFS")
}
static async p_resolveNames(urls) {
/* If and only if TransportNAME was loaded (it might not be as it depends on higher level classes like Domain and SmartDict)
then resolve urls that might be names, returning a modified array.
*/
if (this.namingcb) { //
return await this.namingcb(urls); // Array of resolved urls
} else {
return urls;
}
}
static resolveNamesWith(cb) {
// Set a callback for p_resolveNames
this.namingcb = cb;
}
static async _p_rawstore(tt, data, verbose) {
// Internal method to store at known transports
let errs = [];
let rr = await Promise.all(tt.map(async function(t) {
try {
return await t.p_rawstore(data, verbose); //url
} catch(err) {
console.log("Could not rawstore to", t.name, err.message);
errs.push(err);
return undefined;
}
}));
rr = rr.filter((r) => !!r); // Trim any that had errors
if (!rr.length) {
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); // New error with concatenated messages
}
return rr;
}
static async p_rawstore(data, verbose) {
/*
data: Raw data to store - typically a string, but its passed on unmodified here
returns: Array of urls of where stored
throws: TransportError with message being concatenated messages of transports if NONE of them succeed.
*/
let tt = this.validFor(undefined, "store").map(([u, t]) => t); // Valid connected transports that support "store"
if (verbose) console.log("Valid for transports:", tt.map(t => t.name));
if (!tt.length) {
throw new errors.TransportError('Transports.p_rawstore: Cant find transport for store');
}
return this._p_rawstore(tt, data, verbose);
}
static async p_rawlist(urls, verbose) {
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "list"); // Valid connected transports that support "store"
if (!tt.length) {
throw new errors.TransportError('Transports.p_rawlist: Cant find transport for urls:'+urls.join(','));
}
let errs = [];
let ttlines = await Promise.all(tt.map(async function([url, t]) {
try {
return await t.p_rawlist(url, verbose); // [sig]
} catch(err) {
console.log("Could not rawlist ", url, "from", t.name, err.message);
errs.push(err);
return [];
}
})); // [[sig,sig],[sig,sig]]
if (errs.length >= tt.length) {
// All Transports failed (maybe only 1)
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); // New error with concatenated messages
}
let uniques = {}; // Used to filter duplicates
return [].concat(...ttlines)
.filter((x) => (!uniques[x.signature] && (uniques[x.signature] = true)));
}
static async p_rawfetch(urls, opts) {
/*
Fetch the data for a url, transports act on the data, typically storing it.
urls: array of urls to retrieve (any are valid)
opts {
verbose,
start, integer - first byte wanted
end integer - last byte wanted (note this is inclusive start=0,end=1023 is 1024 bytes
timeoutMS integer - max time to wait on transports (IPFS) that support it
}
returns: string - arbitrary bytes retrieved.
throws: TransportError with concatenated error messages if none succeed.
*/
let verbose = opts.verbose;
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "fetch"); //[ [Url,t],[Url,t]]
if (!tt.length) {
throw new errors.TransportError("Transports.p_fetch cant find any transport for urls: " + urls);
}
//With multiple transports, it should return when the first one returns something.
let errs = [];
let failedtransports = []; // Will accumulate any transports fail on before the success
for (const [url, t] of tt) {
try {
let data = await t.p_rawfetch(url, opts); // throws errors if fails or timesout
//TODO-MULTI-GATEWAY working here
if (opts.relay && failedtransports.length) {
console.log(`Relaying ${data.length} bytes from ${typeof url === "string" ? url : url.href} to ${failedtransports.map(t=>t.name)}`);
this._p_rawstore(failedtransports, data, verbose)
.then(uu => console.log(`Relayed to ${uu}`)); // Happening async, not waiting and dont care if fails
}
//END TODO-MULTI-GATEWAY
return data;
} catch (err) {
failedtransports.push(t);
errs.push(err);
console.log("Could not retrieve ", url.href, "from", t.name, err.message);
// Don't throw anything here, loop round for next, only throw if drop out bottom
//TODO-MULTI-GATEWAY potentially copy from success to failed URLs.
}
}
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); //Throw err with combined messages if none succeed
}
static async p_rawadd(urls, sig, verbose) {
/*
urls: of lists to add to
sig: Sig to add
returns: undefined
throws: TransportError with message being concatenated messages of transports if NONE of them succeed.
*/
//TODO-MULTI-GATEWAY might be smarter about not waiting but Promise.race is inappropriate as returns after a failure as well.
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "add"); // Valid connected transports that support "store"
if (!tt.length) {
throw new errors.TransportError('Transports.p_rawstore: Cant find transport for urls:'+urls.join(','));
}
let errs = [];
await Promise.all(tt.map(async function([u, t]) {
try {
await t.p_rawadd(u, sig, verbose); //undefined
return undefined;
} catch(err) {
console.log("Could not rawlist ", u, "from", t.name, err.message);
errs.push(err);
return undefined;
}
}));
if (errs.length >= tt.length) {
// All Transports failed (maybe only 1)
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); // New error with concatenated messages
}
return undefined;
}
static listmonitor(urls, cb) {
/*
Add a listmonitor for each transport - note this means if multiple transports support it, then will get duplicate events back if everyone else is notifying all of them.
*/
// Note cant do p_resolveNames since sync but should know real urls of resource by here.
this.validFor(urls, "listmonitor")
.map(([u, t]) => t.listmonitor(u, cb));
}
static async p_newlisturls(cl, verbose) {
// Create a new list in any transport layer that supports lists.
// cl is a CommonList or subclass and can be used by the Transport to get info for choosing the list URL (normally it won't use it)
// Note that normally the CL will not have been stored yet, so you can't use its urls.
let uuu = await Promise.all(this.validFor(undefined, "newlisturls")
.map(([u, t]) => t.p_newlisturls(cl, verbose)) ); // [ [ priv, pub] [ priv, pub] [priv pub] ]
return [uuu.map(uu=>uu[0]), uuu.map(uu=>uu[1])]; // [[ priv priv priv ] [ pub pub pub ] ]
}
// Stream handling ===========================================
static async p_f_createReadStream(urls, verbose, options) { // Note options is options for selecting a stream, not the start/end in a createReadStream call
/*
urls: Urls of the stream
returns: f(opts) => stream returning bytes from opts.start || start of file to opts.end-1 || end of file
*/
let tt = this.validFor(urls, "createReadStream", options); //[ [Url,t],[Url,t]] // Passing options - most callers will ignore TODO-STREAM support options in validFor
if (!tt.length) {
throw new errors.TransportError("Transports.p_createReadStream cant find any transport for urls: " + urls);
}
//With multiple transports, it should return when the first one returns something.
let errs = [];
for (const [url, t] of tt) {
try {
return await t.p_f_createReadStream(url, verbose);
} catch (err) {
errs.push(err);
console.log("Could not retrieve ", url.href, "from", t.name, err.message);
// Don't throw anything here, loop round for next, only throw if drop out bottom
//TODO-MULTI-GATEWAY potentially copy from success to failed URLs.
}
}
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); //Throw err with combined messages if none succeed
}
// KeyValue support ===========================================
static async p_get(urls, keys, verbose) {
/*
Fetch the values for a url and one or more keys, transports act on the data, typically storing it.
urls: array of urls to retrieve (any are valid)
keys: array of keys wanted or single key
returns: string - arbitrary bytes retrieved or dict of key: value
throws: TransportError with concatenated error messages if none succeed.
*/
let tt = this.validFor(urls, "get"); //[ [Url,t],[Url,t]]
if (!tt.length) {
throw new errors.TransportError("Transports.p_get cant find any transport for urls: " + urls);
}
//With multiple transports, it should return when the first one returns something.
let errs = [];
for (const [url, t] of tt) {
try {
return await t.p_get(url, keys, verbose); //TODO-MULTI-GATEWAY potentially copy from success to failed URLs.
} catch (err) {
errs.push(err);
console.log("Could not retrieve ", url.href, "from", t.name, err.message);
// Don't throw anything here, loop round for next, only throw if drop out bottom
}
}
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); //Throw err with combined messages if none succeed
}
static async p_set(urls, keyvalues, value, verbose) {
/* Set a series of key/values or a single value
keyvalues: Either dict or a string
value: if kv is a string, this is the value to set
throws: TransportError with message being concatenated messages of transports if NONE of them succeed.
*/
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "set"); //[ [Url,t],[Url,t]]
if (!tt.length) {
throw new errors.TransportError("Transports.p_set cant find any transport for urls: " + urls);
}
let errs = [];
let success = false;
await Promise.all(tt.map(async function([url, t]) {
try {
await t.p_set(url, keyvalues, value, verbose);
success = true; // Any one success will return true
} catch(err) {
console.log("Could not rawstore to", t.name, err.message);
errs.push(err);
}
}));
if (!success) {
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); // New error with concatenated messages
}
}
static async p_delete(urls, keys, verbose) { //TODO-KEYVALUE-API
/* Delete a key or a list of keys
kv: Either dict or a string
value: if kv is a string, this is the value to set
throws: TransportError with message being concatenated messages of transports if NONE of them succeed.
*/
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "set"); //[ [Url,t],[Url,t]]
if (!tt.length) {
throw new errors.TransportError("Transports.p_set cant find any transport for urls: " + urls);
}
let errs = [];
let success = false;
await Promise.all(tt.map(async function([url, t]) {
try {
await t.p_delete(url, keys, verbose);
success = true; // Any one success will return true
} catch(err) {
console.log("Could not rawstore to", t.name, err.message);
errs.push(err);
}
}));
if (!success) {
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); // New error with concatenated messages
}
}
static async p_keys(urls, verbose) {
/*
Fetch the values for a url and one or more keys, transports act on the data, typically storing it.
urls: array of urls to retrieve (any are valid)
keys: array of keys wanted
returns: string - arbitrary bytes retrieved or dict of key: value
throws: TransportError with concatenated error messages if none succeed.
*/
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "keys"); //[ [Url,t],[Url,t]]
if (!tt.length) {
throw new errors.TransportError("Transports.p_keys cant find any transport for urls: " + urls);
}
//With multiple transports, it should return when the first one returns something.
let errs = [];
for (const [url, t] of tt) {
try {
return await t.p_keys(url, verbose); //TODO-MULTI-GATEWAY potentially copy from success to failed URLs.
} catch (err) {
errs.push(err);
console.log("Could not retrieve keys for", url.href, "from", t.name, err.message);
// Don't throw anything here, loop round for next, only throw if drop out bottom
}
}
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); //Throw err with combined messages if none succeed
}
static async p_getall(urls, verbose) {
/*
Fetch the values for a url and one or more keys, transports act on the data, typically storing it.
urls: array of urls to retrieve (any are valid)
keys: array of keys wanted
returns: array of strings returned for the keys. //TODO consider issues around return a data type rather than array of strings
throws: TransportError with concatenated error messages if none succeed.
*/
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
let tt = this.validFor(urls, "getall"); //[ [Url,t],[Url,t]]
if (!tt.length) {
throw new errors.TransportError("Transports.p_getall cant find any transport for urls: " + urls);
}
//With multiple transports, it should return when the first one returns something.
let errs = [];
for (const [url, t] of tt) {
try {
return await t.p_getall(url, verbose); //TODO-MULTI-GATEWAY potentially copy from success to failed URLs.
} catch (err) {
errs.push(err);
console.log("Could not retrieve all keys for", url.href, "from", t.name, err.message);
// Don't throw anything here, loop round for next, only throw if drop out bottom
}
}
throw new errors.TransportError(errs.map((err)=>err.message).join(', ')); //Throw err with combined messages if none succeed
}
static async p_newdatabase(pubkey, verbose) {
/*
Create a new database in any transport layer that supports databases (key value pairs).
pubkey: CommonList, KeyPair, or exported public key
resolves to: [ privateurl, publicurl]
*/
let uuu = await Promise.all(this.validFor(undefined, "newdatabase")
.map(([u, t]) => t.p_newdatabase(pubkey, verbose)) ); // [ { privateurl, publicurl} { privateurl, publicurl} { privateurl, publicurl} ]
return { privateurls: uuu.map(uu=>uu.privateurl), publicurls: uuu.map(uu=>uu.publicurl) }; // { privateurls: [], publicurls: [] }
}
static async p_newtable(pubkey, table, verbose) {
/*
Create a new table in any transport layer that supports the function (key value pairs).
pubkey: CommonList, KeyPair, or exported public key
resolves to: [ privateurl, publicurl]
*/
let uuu = await Promise.all(this.validFor(undefined, "newtable")
.map(([u, t]) => t.p_newtable(pubkey, table, verbose)) ); // [ [ priv, pub] [ priv, pub] [priv pub] ]
return { privateurls: uuu.map(uu=>uu.privateurl), publicurls: uuu.map(uu=>uu.publicurl)}; // {privateurls: [ priv priv priv ], publicurls: [ pub pub pub ] }
}
static async p_connection(urls, verbose) {
/*
Do any asynchronous connection opening work prior to potentially synchronous methods (like monitor)
*/
urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
await Promise.all(
this.validFor(urls, "connection")
.map(([u, t]) => t.p_connection(u, verbose)));
}
static monitor(urls, cb, verbose) {
/*
Add a listmonitor for each transport - note this means if multiple transports support it, then will get duplicate events back if everyone else is notifying all of them.
Stack: KVT()|KVT.p_new => KVT.monitor => (a: Transports.monitor => YJS.monitor)(b: dispatchEvent)
*/
//Cant' its async. urls = await this.p_resolveNames(urls); // If naming is loaded then convert to a name
this.validFor(urls, "monitor")
.map(([u, t]) => t.monitor(u, cb, verbose));
}
static addtransport(t) {
/*
Add a transport to _transports,
*/
Transports._transports.push(t);
}
// Setup Transports - setup0 is called once, and should return quickly, p_setup1 and p_setup2 are asynchronous and p_setup2 relies on p_setup1 having resolved.
static setup0(transports, options, verbose) {
/*
Setup Transports for a range of classes
transports is abbreviation HTTP, IPFS, LOCAL or list of them e.g. "HTTP,IPFS"
Handles "LOCAL" specially, turning into a HTTP to a local server (for debugging)
returns array of transport instances
*/
// "IPFS" or "IPFS,LOCAL,HTTP"
let localoptions = {http: {urlbase: "http://localhost:4244"}};
return transports.map((tabbrev) => {
let transportclass;
if (tabbrev === "LOCAL") {
transportclass = this._transportclasses["HTTP"];
} else {
transportclass = this._transportclasses[tabbrev];
}
if (!transportclass) {
let tt = Object.keys(this._transportclasses);
console.error(`Requested ${tabbrev} but ${tt.length ? tt : "No"} transports have been loaded`);
return undefined;
} else {
return transportclass.setup0(tabbrev === "LOCAL" ? localoptions : options, verbose);
}
}).filter(f => !!f); // Trim out any undefined
}
static async p_setup1(verbose) {
/* Second stage of setup, connect if possible */
// Does all setup1a before setup1b since 1b can rely on ones with 1a, e.g. YJS relies on IPFS
await Promise.all(this._transports.map((t) => t.p_setup1(verbose)));
}
static async p_setup2(verbose) {
/* Second stage of setup, connect if possible */
// Does all setup1a before setup1b since 1b can rely on ones with 1a, e.g. YJS relies on IPFS
await Promise.all(this._transports.map((t) => t.p_setup2(verbose)));
}
static async test(verbose) {
if (verbose) {console.log("Transports.test")}
try {
/* Could convert this - copied fom YJS to do a test at the "Transports" level
let testurl = "yjs:/yjs/THISATEST"; // Just a predictable number can work with
let res = await transport.p_rawlist(testurl, verbose);
let listlen = res.length; // Holds length of list run intermediate
if (verbose) console.log("rawlist returned ", ...utils.consolearr(res));
transport.listmonitor(testurl, (obj) => console.log("Monitored", obj), verbose);
let sig = new Dweb.Signature({urls: ["123"], date: new Date(Date.now()), signature: "Joe Smith", signedby: [testurl]}, verbose);
await transport.p_rawadd(testurl, sig, verbose);
if (verbose) console.log("TransportIPFS.p_rawadd returned ");
res = await transport.p_rawlist(testurl, verbose);
if (verbose) console.log("rawlist returned ", ...utils.consolearr(res)); // Note not showing return
await delay(500);
res = await transport.p_rawlist(testurl, verbose);
console.assert(res.length === listlen + 1, "Should have added one item");
*/
//console.log("TransportYJS test complete");
/* TODO-KEYVALUE reenable these tests,s but catch http examples
let db = await this.p_newdatabase("TESTNOTREALLYAKEY", verbose); // { privateurls, publicurls }
console.assert(db.privateurls[0] === "yjs:/yjs/TESTNOTREALLYAKEY");
let table = await this.p_newtable("TESTNOTREALLYAKEY","TESTTABLE", verbose); // { privateurls, publicurls }
let mapurls = table.publicurls;
console.assert(mapurls[0] === "yjs:/yjs/TESTNOTREALLYAKEY/TESTTABLE");
await this.p_set(mapurls, "testkey", "testvalue", verbose);
let res = await this.p_get(mapurls, "testkey", verbose);
console.assert(res === "testvalue");
await this.p_set(mapurls, "testkey2", {foo: "bar"}, verbose);
res = await this.p_get(mapurls, "testkey2", verbose);
console.assert(res.foo === "bar");
await this.p_set(mapurls, "testkey3", [1,2,3], verbose);
res = await this.p_get(mapurls, "testkey3", verbose);
console.assert(res[1] === 2);
res = await this.p_keys(mapurls);
console.assert(res.length === 3 && res.includes("testkey3"));
res = await this.p_getall(mapurls, verbose);
console.assert(res.testkey2.foo === "bar");
*/
} catch(err) {
console.log("Exception thrown in Transports.test:", err.message);
throw err;
}
}
}
Transports._transports = []; // Array of transport instances connected
Transports.namingcb = undefined;
Transports._transportclasses = {}; // Pointers to classes whose code is loaded.
exports = module.exports = Transports;

118
src/utils.js Normal file
View File

@ -0,0 +1,118 @@
utils = {}; //utility functions
// ==== OBJECT ORIENTED JAVASCRIPT ===============
// This is a general purpose library of functions, the commented out ones come from other this libraries use in other places
// Utility function to print a array of items but just show number and last.
utils.consolearr = (arr) => ((arr && arr.length >0) ? [arr.length+" items inc:", arr[arr.length-1]] : arr );
/*
//Return true if two shortish arrays a and b intersect or if b is not an array, then if b is in a
//Note there are better solutions exist for longer arrays
//This is intended for comparing two sets of probably equal, but possibly just intersecting URLs
utils.intersects = (a,b) => (Array.isArray(b) ? a.some(x => b.includes(x)) : a.includes(b));
utils.mergeTypedArraysUnsafe = function(a, b) { // Take care of inability to concatenate typed arrays such as Uint8
//http://stackoverflow.com/questions/14071463/how-can-i-merge-typedarrays-in-javascript also has a safe version
const c = new a.constructor(a.length + b.length);
c.set(a);
c.set(b, a.length);
return c;
};
*/
/*
//TODO-STREAM, use this code and return stream from p_rawfetch that this can be applied to
utils.p_streamToBuffer = function(stream, verbose) {
// resolve to a promise that returns a stream.
// Note this comes form one example ...
// There is another example https://github.com/ipfs/js-ipfs/blob/master/examples/exchange-files-in-browser/public/js/app.js#L102 very different
return new Promise((resolve, reject) => {
try {
let chunks = [];
stream
.on('data', (chunk) => { if (verbose) console.log('on', chunk.length); chunks.push(chunk); })
.once('end', () => { if (verbose) console.log('end chunks', chunks.length); resolve(Buffer.concat(chunks)); })
.on('error', (err) => { // Note error behavior untested currently
console.log("Error event in p_streamToBuffer",err);
reject(new errors.TransportError('Error in stream'))
});
stream.resume();
} catch (err) {
console.log("Error thrown in p_streamToBuffer", err);
reject(err);
}
})
};
*/
/*
//TODO-STREAM, use this code and return stream from p_rawfetch that this can be applied to
//TODO-STREAM debugging in streamToBuffer above, copy to here when fixed above
utils.p_streamToBlob = function(stream, mimeType, verbose) {
// resolve to a promise that returns a stream - currently untested as using Buffer
return new Promise((resolve, reject) => {
try {
let chunks = [];
stream
.on('data', (chunk)=>chunks.push(chunk))
.once('end', () =>
resolve(mimeType
? new Blob(chunks, { type: mimeType })
: new Blob(chunks)))
.on('error', (err) => { // Note error behavior untested currently
console.log("Error event in p_streamToBuffer",err);
reject(new errors.TransportError('Error in stream'))
});
stream.resume();
} catch(err) {
console.log("Error thrown in p_streamToBlob",err);
reject(err);
}
})
};
*/
utils.stringfrom = function(foo, hints={}) {
try {
// Generic way to turn anything into a string
if (foo.constructor.name === "Url") // Can't use instanceof for some bizarre reason
return foo.href;
if (typeof foo === "string")
return foo;
return foo.toString(); // Last chance try and convert to a string based on a method of the object (could check for its existence)
} catch (err) {
throw new errors.CodingError(`Unable to turn ${foo} into a string ${err.message}`)
}
};
/*
utils.objectfrom = function(data, hints={}) {
// Generic way to turn something into a object (typically expecting a string, or a buffer)
return (typeof data === "string" || data instanceof Buffer) ? JSON.parse(data) : data;
}
utils.keyFilter = function(dic, keys) {
// Utility to return a new dic containing each of keys (equivalent to python { dic[k] for k in keys }
return keys.reduce(function(prev, key) { prev[key] = dic[key]; return prev; }, {});
}
*/
utils.p_timeout = function(promise, ms, errorstr) {
/* In a certain period, timeout and reject
promise: A promise we want to watch to completion
ms: Time in milliseconds to allow it to run
errorstr: Error message in reject error
*/
let timer = null;
return Promise.race([
new Promise((resolve, reject) => {
timer = setTimeout(reject, ms, errorstr || `Timed out in ${ms}ms`);
}),
promise.then((value) => {
clearTimeout(timer);
return value;
})
]);
}
exports = module.exports = utils;