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53
README.md
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@ -1,2 +1,53 @@
# DwebTransports
General transport library for Decentralized Web handles multiple underlying transports
General transport library for Decentralized Web handles multiple underlying transports.
## Background
This library is part of a general project at the Internet Archive (archive.org)
to support the decentralized web.
###Goals
* to allow a single API that can be used for most basic interactions with
decentralized transports.
* to support multiple URLs, on different transports, so that the (current) underlying unreliability
is hidden.
### Node Installation
* Clone this repo.
* Until this is in npm, add the line
`"dweb-transports": "git+https://git@github.com/mitra42/dweb-transports.git",`
to your package.json file in the dependencies section.
* (TODO Note location above will change to an internetarchive repo)
* `npm install dweb-transports` will install the dependencies including IPFS & WebTorrent
`const DwebTransports = require(dweb-transport)` will add all Transports to a Javascript file.
* TODO writeup how to require only some of the transports.
* Then see usage API below
### Installation and usage in the Browser
* TODO installation of dev dependencies
* Install npm & node
* Clone this repo and cd to it.
* `npm bundle` will create dist/dweb_transports_bundle.js
* Add `<SCRIPT type="text/javascript" src="dweb_transports_bundle.js"></SCRIPT>` to your `<HEAD>`
* TODO need to split out necessary from htmlutils so p_connect exposed
Then code like this should work.
```
async function main() {
try {
// Connect to a set of transports, that the user can override
// p_connect will look for "?transport=HTTP" etc to override defaults
await p_connect({defaulttransport: ["HTTP", "IPFS"]});
// Code you want to happen after connection goes here
// Fetch some data from a service, specifiying two places to get it
foo = await DwebTransports.p_fetch(["http://bar.com/foo.json", "ipfs:/ipfs/Q1abc"], verbose);
} catch(err) {
alert(err.message);
}
}
var searchparams = new URL(window.location.href).searchParams;
// Allow specifying ?verbose=true in URL to get debugging
var verbose = searchparams.get("verbose") || false;
```

7
Transport.js
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@ -11,6 +11,10 @@ class Transport {
/*
Doesnt do anything, its all done by SuperClasses,
Superclass should merge with default options, call super
Fields:
statuselement: If set is an HTML Element that should be adjusted to indicate status.
name: Short name of element e.g. HTTP IPFS WEBTORRENT
*/
}
@ -38,7 +42,7 @@ class Transport {
return t.p_setup2(verbose); // And connect
}
togglePaused() {
togglePaused(cb) { //TODO-API
switch (this.status) {
case Transport.STATUS_CONNECTED:
this.status = Transport.STATUS_PAUSED;
@ -47,6 +51,7 @@ class Transport {
this.status = Transport.STATUS_CONNECTED; // Superclass might change to STATUS_STARTING if needs to stop/restart
break;
}
if (cb) cb(this);
}
supports(url, func) {

6
TransportHTTP.js
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@ -62,7 +62,11 @@ class TransportHTTP extends Transport {
throw err;
}
}
async p_setup1(verbose) {
async p_setup1(verbose, cb) {
this.status = Transport.STATUS_STARTING;
if (cb) cb(this);
await this.p_status(verbose);
if (cb) cb(this);
return this;
}

6
TransportIPFS.js
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@ -110,16 +110,18 @@ class TransportIPFS extends Transport {
return t;
}
async p_setup1(verbose) {
async p_setup1(verbose, cb) { //TODO-API
try {
if (verbose) console.log("IPFS starting and connecting");
this.status = Transport.STATUS_STARTING; // Should display, but probably not refreshed in most case
if (cb) cb(this);
await this.p_ipfsstart(verbose); // Throws Error("websocket error") and possibly others.
this.status = (await this.ipfs.isOnline()) ? Transport.STATUS_CONNECTED : Transport.STATUS_FAILED;
this.status = await this.p_status(verbose);
} catch(err) {
console.error("IPFS failed to connect",err);
this.status = Transport.STATUS_FAILED;
}
if (cb) cb(this);
return this;
}

6
TransportWEBTORRENT.js
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@ -66,14 +66,17 @@ class TransportWEBTORRENT extends Transport {
return t;
}
async p_setup1(verbose) {
async p_setup1(verbose, cb) {
try {
this.status = Transport.STATUS_STARTING;
if (cb) cb(this);
await this.p_webtorrentstart(verbose);
await this.p_status(verbose);
} catch(err) {
console.error("WebTorrent failed to connect",err);
this.status = Transport.STATUS_FAILED;
}
if (cb) cb(this);
return this;
}
@ -88,7 +91,6 @@ class TransportWEBTORRENT extends Transport {
} else {
this.status = Transport.STATUS_FAILED;
}
return this.status;
}

5
TransportYJS.js
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@ -110,7 +110,7 @@ class TransportYJS extends Transport {
return t;
}
async p_setup2(verbose) {
async p_setup2(verbose, cb) {
/*
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.
@ -118,12 +118,15 @@ class TransportYJS extends Transport {
*/
try {
this.status = Transport.STATUS_STARTING; // Should display, but probably not refreshed in most case
if (cb) cb(this);
this.options.yarray.connector.ipfs = Transports.ipfs(verbose).ipfs; // Find an IPFS to use (IPFS's should be starting in p_setup1)
this.yarrays = {};
await this.p_status(verbose);
} catch(err) {
console.error("YJS failed to start",err);
this.status = Transport.STATUS_FAILED;
}
if (cb) cb(this);
return this;
}

14
Transports.js
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@ -432,17 +432,17 @@ class Transports {
// 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) {
static setup0(tabbrevs, options, verbose, cb) {
/*
Setup Transports for a range of classes
transports is abbreviation HTTP, IPFS, LOCAL or list of them e.g. "HTTP,IPFS"
tabbrevs 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) => {
return tabbrevs.map((tabbrev) => {
let transportclass;
if (tabbrev === "LOCAL") {
transportclass = this._transportclasses["HTTP"];
@ -458,15 +458,15 @@ class Transports {
}
}).filter(f => !!f); // Trim out any undefined
}
static async p_setup1(verbose) {
static async p_setup1(verbose, cb) {
/* 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)));
await Promise.all(this._transports.map((t) => t.p_setup1(verbose, cb)))
}
static async p_setup2(verbose) {
static async p_setup2(verbose, cb) {
/* 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)));
await Promise.all(this._transports.map((t) => t.p_setup2(verbose, cb)))
}
static async test(verbose) {
if (verbose) {console.log("Transports.test")}

661
dist/LICENSE vendored
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@ -1,661 +0,0 @@
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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.
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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
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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/>.

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# DwebTransports
General transport library for Decentralized Web handles multiple underlying transports

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--suppress HtmlUnknownTarget -->
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>DWEB Transports example page</title>
<script type="text/javascript" src="./dist/dweb_transports_bundle.js"></script>
<script type="text/javascript" src='https://cloud.tinymce.com/stable/tinymce.min.js'></script><!-- TinyMCE -->
<!--TODO What parts of example_styles.css, htmlutils.js and loginutils.js are needed ?-->
<link rel='stylesheet' href='example_styles.css'>
<script type="text/javascript" src="htmlutils.js"></script><!--objectbrowser functionality for debugging-->
<script type="text/javascript" src="loginutils.js"></script><!--Login tools (used for p_connect) -->
<script type="text/javascript">
tinymce.init({
selector: '#mytextarea',
menubar: "true",
plugins: [ "save",
'advlist autolink lists link image charmap print preview anchor',
'searchreplace visualblocks code fullscreen',
'insertdatetime media table contextmenu paste code' ],
toolbar: 'save | undo redo | insert | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image',
save_onsavecallback: function() {
let verbose = true; // See commentary in console.log
let content = tinyMCE.get('mytextarea').getContent();
// alert(content);
let el = document.getElementById("retrievalarea");
let urls = DwebTransports.p_rawstore(content, verbose)
.then((urls) => el.value = urls)
.catch((err) => {console.error("saveoncallback", err); alert(err)});
}
});
function fetchit() {
let el = document.getElementById("retrievalarea");
let urls = urlsFrom(el.value);
fetchanddisplay(urls);
}
async function fetchanddisplay(urls) {
try {
console.log("Fetching urls=", urls);
let destn = document.getElementById("retrievaldestn");
destn.innerHTML = ""; // Clear it first
let data = await DwebTransports.p_rawfetch(urls, {verbose});
console.log("Retrieved data length", data.length);
destn.innerHTML = data;
} catch(err) {
console.log("fetchanddisplay: Error",err.message);
alert(err.message);
throw err;
}
}
async function main(url) {
//This is the "main()", starts a transport, checks its status, and if appropriate to app opens a URL passed
try {
// p_connect will look in searchparams for e.g.: ?transport=HTTP&transport=WEBTORRENT
// and if not found will use the defaulttransports specified here.
await p_connect({
defaulttransports: ["HTTP","IPFS"],
statuselement: document.getElementById("statuselement")
}); // Default startup beavior from loginutils.js // {http: {urlbase: "http://localhost:4244"}} for local
// Any code you want to run after connected to transports goes here.
if (url) fetchanddisplay(url);
} catch(err) {
console.log("App Error:", err);
alert(err.message);
}
}
</script>
<script type="text/css">
.button { border: 1px black solid; background-color:#dddddd; padding-bottom:0.1em; padding-top:0.1em;}
</script>
</head>
<body>
<!--Network status box - this is standard for any app -->
<!--TODO replace next div with following-->
<div class="floatright" style="position:relative;">
<ul id="transportstatuses"><li class='template vertical_li' onclick="transportclick(this);"><span name='name'></span></li></ul>
</div><!--End of standard network status and login panel-->
<div class="floatright statuselement" style="position:relative;" id="statuselement"></div>
<h1>Dweb - Transports Example - unstructured data store and retrieval</h1>
<h4>Create something here, and when its saved its urls will appear below</h4>
<form method="post">
<textarea id="mytextarea" width="60%">Testing</textarea>
</form>
<h4>Enter a link here and it will be retrieved.</h4>
<form style="display:inline" onsubmit="fetchit(); return false;">
<input type="text" class="propval" id="retrievalarea" placeholder="ipfs:/ipfs/12ab34cd" size="70"/>
<input type="submit" class="button" value="Fetch"/>
</form>
<div class="displayedblock" id="retrievaldestn">retrieved data will go here</div>
<hr>
<h2>Explanation</h2>
<ul>
<li>As you open the page it tries to connect to the transports, which by default are HTTP and IPFS.</li>
<li>These should change to Yellow as they try, and then Green when connected.</li>
<li>If it goes Red, it means it failed to connect - e.g. to get an "info" response from HTTP, or to conenct to IPFS.</li>
<li>You can edit text, which is happening entirely locally on your machine.</li>
<li>When you hit Save, its stored on the connected transports</li>
<li>A link to this is put in the Retrieval box</li>
<li>You can click on the Retrieve button and it will be retrieved and displayed for editing.</li>
<li>You can also paste that link into a different browser.</li>
</ul>
<script type="text/javascript">
var searchparams = new URL(window.location.href).searchParams;
var verbose = searchparams.get("verbose") || false; // Anything specified for verbose is true (could truthify buy no need)
main(searchparams.get("url")); //starts a transport, checks its status, and if appropriate to app opens a URL passed
</script>
</body>
</html>

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/* Styles used for all the examples */
/* Styles used for tables of properties, especially by (now obsolete) objbrowser.js*/
.props { padding-left: 0; } /*Move back directly under type name*/
.prop {display:table-row; border: 1px dotted grey; } /*ignoring border*/
.propname {display:table-cell; font-weight:bold;background-color:#cccccc;border: 1px dotted grey; padding-left:0.3em; padding-right:0.3em} /*width:15em */
.examplesacademic .propname {background-color:#f0f0f0; border: 0; }
.propval {display:table-cell; background-color:#dddddd;border: 1px dotted grey; padding-left: 0.3em; padding-right: 0.3em;} /*width:15em;*/
.propval span {white-space: pre;} /*Dont want white-space in e.g. img*/
.proplinks {padding-left: 0.5em;} /*List of sub-objects inside propval*/
.propobj {border-color: black; border-top: 2px solid; padding-bottom:0.3em; padding-top:0.3em; }
.classname {font-weight: bold;} /* Used for class name in objbrowser */
.propurls {display: table; padding: 0px;} /* Ignore ul padding default which is large */
.propurl {display: table-row} /* propurl inside propurls */
/*
Styles for appearing/disappearing parts based on hover or active
hoveronly appear only when they are active, hoverclue only when not active
the :active :hover :focus are to ensure it works on mobile devices as well
*/
.container form.hoveronly, .container div.hoveronly, .container span.hoveronly,.container i.hoveronly{display: none}
.container:active span.hoveronly,.container:active span.hoveronly,.container:hover span.hoveronly{display: inline}
.container:active i.hoveronly,.container:focus i.hoveronly,.container:hover i.hoveronly{display: inline-block}
.container:active form.hoveronly,.container:focus form.hoveronly,.container:hover form.hoveronly{display: block}
.container:active div.hoveronly,.container:focus div.hoveronly,.container:hover div.hoveronly{display: block}
.container span.hoverclue{display: inline}/* Text in headline to disappear when main part open*/
.container:active .hoverclue,.container:focus .hoverclue,.container:hover .hoverclue{display: none}
/*
Some specific styles used by difference examples
*/
.floatright {margin: 0 0 3px 10px; float: right; clear: right; text-align: right} /* Grouped in top right corner */
.examplesarchive .floatright { position: fixed; z-index: 999999; top: 100px; right: 10px; font-size: 50% }
.examplesarchive .floatright ul {display: grid; grid-template-columns: repeat(auto-fit, minmax(7em, 1fr)); grid-auto-flow: dense;}
.floatleft {margin: 0 0 3px 10px; clear: left; float: left; text-align: left} /* Grouped in top left corner */
.floatright li {margin: 0 0 3px 10px; }
.floatright ul {margin: 0 0 3px 10px; }
.examplesarchive .floatright ul { width: 150px;} /* Wide enogh for two indicators */
.examplesarchive .floatright li { padding-top: 1px; margin: 0 0 3px 3px;} /* Wide enogh for two indicators */
.vertical_li {display: table-row; padding-top: 3px; padding-right: 0; margin: 0 0 3px 3px;}
.said {display: block; border-bottom: 1px black solid;} /* Each item added to list in example_list */
.button { border: 1px black solid; background-color:#dddddd; padding-bottom:0.1em; display:inline;} /* Buttons */
.displayedblock {border: 1px #e0e0e0 solid; background-color:#f0f0f0; box-shadow: 1px 1px 2px #cccccc; padding-top:0.1em; padding-bottom: 0.1em; margin-top: 10px; margin-bottom: 5px; display:inline-block;}
.displayedblockheader {background-color:#e0e0e0; padding-top:0.1em; padding-bottom: 0.1em; margin-top: 3px; margin-bottom: 3px;}
.dialogform .propval {white-space: pre; display:block; background-color:#dddddd;border: 1px dotted grey; padding-left: 0.3em; padding-top: 0.3em; padding-bottom: 0.1em; margin-top: 0.5em; margin-left: 0.5em; margin-right: 0.5em; margin-bottom: 0.5em; }
.dialogform .button { border: 1px black solid; background-color:#dddddd; padding-bottom: 0.1em; padding-right: 0.3em; padding-left: 0.3em; margin-top: 0.5em; margin-left: 0.5em; margin-right: 0.5em; margin-bottom: 0.5em;}
.iconopener {width:20px;}
.inline_li {display:inline-grid; padding-left: 1em; padding-right: 1em;} /*A single login in a list of KeyChains or Keys */
.inline_ul {display:inline; -webkit-padding-start: 0;} /*A List of KeyChains or Keys*/
.keylist_icon {height: 12px; margin-left: 12px; margin-right: 3px;}
.inline {display:inline;}
.hidden {display:none}
.overdiv {position: absolute; top: 1em; left: 1em; z-index:10; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; } /* Dialogue box over other*/
.template {display: none}
.tooltip { position: relative; display: inline-block; } /*border-bottom: 1px dotted black; */
.tooltip .tooltiptext { visibility: hidden; z-index: 1; opacity: 0; transition: opacity 1s;
width: 250px; background-color: #555; color: #fff; text-align: center; border-radius: 6px; padding: 5px 0;
position: absolute; bottom: 125%; left: 50%; margin-left: -125px; }
.tooltip .tooltiptext::after { content: ""; position: absolute; top: 100%; left: 50%;
margin-left: -5px; border-width: 5px; border-style: solid; border-color: #555 transparent transparent transparent; }
.tooltip:hover .tooltiptext { visibility: visible; opacity: 1; }
.propval .tooltiptext {white-space: normal}
/*
Academic playing around without effecting others
*/
.examplesacademic .fileslist { text-align: center;}
.academic_demo_img {display:table-cell; margin-right:10px;}
.academic_demo_link {display: table-cell;}
.academic_demo_a {display:table-row; text-align: left;}
.academic_demo_meta {background-color:#f0f0f0; border: 0; vertical-align: middle; display:block; text-align:left; margin-bottom:10px; }
.academic_demo_file {margin-bottom: 20px;}
.examplesacademic #searchresults [name=title] {font-weight: bold;}
.examplesacademic #metadataresults [name=doi_org_metadata_title] {font-weight: bold;}
.examplesacademic #searchresults li {text-align: left; margin-bottom: 10px;}
.examplesacademic #searchresults span {display: inline-block;}/*Try and keep each part together*/
.exampleskeys .inline_ul {display: grid; grid-template-columns: repeat(auto-fit, minmax(7em, 1fr)); grid-auto-flow: dense;}
.examples #vl_target {display: block;}
.examples #loginform {position: absolute; top: 0.5em; right: 1em; z-index:5; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; }
.examples #registrationform {position: absolute; top: 1em; right: 1.5em; z-index:10; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; }/* z > loginform*/
.examples #keychain {position: absolute; top: 0.5em; right: 1em; z-index:5; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; width: 450px;}
.examples #keynew_form {position: absolute; top: 1em; right: 1.5em; z-index:7; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; width: 450px;}/*z > keychain*/
.examples #locknew_form {position: absolute; top: 1em; right: 1.5em; z-index:7; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; width: 450px;}/*z > keychain*/
.examples #lock_div {position: absolute; top: 0.5em; right: 1em; z-index:7; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; width: 450px;}/*z > keychain*/
.examples #tokennew_form {position: absolute; top: 0.5em; right: 1em; z-index:10; background-color: #f0f0ff; border: 1px #e0e0e0 solid; padding: 5px; width: 450px; text-align:left;}/*z > lock_div*/
.transportstatus0 {color: lawngreen}
.transportstatus1 {color: red}
.transportstatus2 {color: yellow}
.transportstatus3 {color: black}
.transportstatus4 {color: purple}

292
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/*
This file is a set of utility functions used in the manipulation of HTML pages
There is nothing specific to Dweb at all here, feel free to copy and modify.
*/
function urlsFrom(url) {
/* Convert to urls,
url: Array of urls, or string representing url or representing array of urls
return: Array of strings representing url
*/
if (typeof(url) === "string") {
if (url[0] === '[')
url = JSON.parse(url);
else if (url.includes(','))
url = url.split(',');
else
url = [ url ];
}
if (!Array.isArray(url)) throw new Error(`Unparsable url: ${url}`);
return url;
}
function elementFrom(el) {
/* Make sure we have an element, if passed a string then find the element with that id.
el: Element or string being the id of an element.
returns: element.
*/
return (typeof(el) === "string") ? document.getElementById(el) : el;
}
async function p_resolveobj(url) {
/*
Asynchronously find an object
url: An object, or a url representing an object, or an array of urls.
returns: Object
throws: Error if can't resolve object
*/
try {
if (typeof url === 'string')
url = [ url ];
if (Array.isArray(url))
url = await Dweb.SmartDict.p_fetch(url, verbose);
return url;
} catch(err) {
console.log("p_resolveobj: Cannot resolve",url);
throw err;
}
}
function form2dict(frm) {
/* Convert a form into a dictionary
its mindblowing that Javascript even at EC6 doesnt have this !
*/
let res = {};
/* Find the element if we are given a string */
/* Note this is not the usual getElementById since forms have their own array */
let el_form = (typeof frm === "string") ? document.forms.namedItem(frm) : frm;
for (let el of el_form.elements) {
if (el.type !== "submit") {
res[el.name] = el.value;
}
}
return res;
}
function togglevis(el, displayvis) {
/*
Toggle the visibility of an item
el element, its id, or an array of elements
displayvis is one of "inline" "block" "inlineblock"
*/
if (Array.isArray(el)) {
el.map((e) => togglevis(e, displayvis))
} else {
el = elementFrom(el);
el.style.display = (el.style && el.style.display === "none" ? displayvis : "none");
}
}
function setstatus(msg) {
// Display the message in a Status DIV (usually top right corner, but could be anywhere example wants it)
document.getElementById("status").innerHTML=msg;
}
function deletechildren(el, keeptemplate) {
/*
Remove all children from a node
:param el: An HTML element, or a string with id of an HTML element
*/
if (typeof keeptemplate === "undefined") keeptemplate=true;
el = (typeof(el) === "string") ? document.getElementById(el) : el;
// Carefull - this deletes from the end, because template if it exists will be firstChild
while (el.lastChild && !(keeptemplate && el.lastChild.classList && el.lastChild.classList.contains("template"))) {
// Note that deletechildren is also used on Span's to remove the children before replacing with text.
el.removeChild(el.lastChild);
}
return el; // For chaining
}
function replacetext(el, text) {
/* Replace the text of el with text, removing all other children
:param el: An HTML element, or a string with id of an HTML element
*/
el = elementFrom(el);
//console.log("replacetext",text,el.constructor.name) // Uncomment to get class name of different things want to edit
if (el instanceof HTMLImageElement) {
el.src = text;
} else {
deletechildren(el);
return el.appendChild(document.createTextNode(text))
}
}
function replacetexts(el, ...dict) {
/*
Replace the text of all inner nodes of el from the dict
Note this intentionally doesnt allow html as the values of the dict since probably from a network call and could be faked as "bad" html
Rules apply to el or any children.
<x name="yyy"></x> Adds an inner text node with oo.yyy
<x name="aaa_bbb"></x> Replaces with ooo.aaa.bbb
<x name="aaa"><y name="bbb"></y></x> Replaces with ooo.aaa.bbb
<x name="aaa"><y class="template"/></x> Has y replecated withe each of ooo.aaa[]
<x value="ccc"></x> Has value replaced with ooo.ccc (typically used for <option> etc inside <form>, arrays will be JSON stringified
<a href="ddd"></x> Has href replaced with ooo.ddd
<img name="eee"/> Has src replaced with ooo.eee (in replacetext)
This is intended to be easy to use, not necessarily bomb-proof, odd structures of HTML or oo may cause unpredictable results.
:param el: An HTML element, or a string with id of an HTML element
:param dict: Multiple arguments, each a dictionary or object, or a single array argument
*/
// First combine with a raw dict so that "prop" doesnt get functions and handles dict like things
el = elementFrom(el);
if (Array.isArray(dict[0])) {
_replacetexts("", el, dict[0])
} else if (typeof dict[0] === "string") { // Its just text string, no field name, so look for "_"
_replacetexts("", el, {"_": dict[0]});
} else {
el.source = dict[0]; // Usually used with one object, if append fields its usually just calculated for display
_replacetexts("", el, Object.assign({}, ...dict))
}
return el;
}
function _replacetexts(prefix, el, oo) {
/*
Inner function for replacetexts to allow crawling depth of oo
*/
if (Array.isArray(oo)) { // Add a templated element for each member of array
deletechildren(el);
oo.map((f) => addtemplatedchild(el, {}, f))
} else {
for (let prop in oo) {
try {
let p = prefix + prop;
let val = oo[prop];
if (val instanceof Date) { // Convert here because otherwise treated as an object
val = val.toString();
}
if (typeof val === "object" && !Array.isArray(val)) {
// Look for current level, longer names e.g. prefixprop_xyz
Array.prototype.slice.call(el.querySelectorAll(`[name=${p}]`)).map((i) => replacetexts(i, val) );
//Commented out prefix version since runs into problems with complex nested objects such as "ipfs" in transports
//_replacetexts(`${p}_`, el, val);
// And nowif found any prefixprop look at xyz under it
Array.prototype.slice.call(el.querySelectorAll(`[name=${p}]`)).map((i) => _replacetexts("", i, val));
}
else if (typeof val === "object" && Array.isArray(val)) { // Exand an array into sub tags
if (el.getAttribute("value") === p) el.value = JSON.stringify(val); //Do the parent as well if its e.g. an option, convert to something that urlsFrom will understand
let dests = el.querySelectorAll(`[name=${p}]`);
Array.prototype.slice.call(dests).map((i) => replacetexts(i, val));
} else {
if (el.getAttribute("name") === p) replacetext(el, val); //Do the parent as well
if (el.getAttribute("value") === p) el.value = val; //Do the parent as well
Array.prototype.slice.call(el.querySelectorAll(`[name=${p}]`)).map((i) => replacetext(i, val)); // <span name="text">...val...</span>
if (el.getAttribute("href") === p) el.href = val;
Array.prototype.slice.call(el.querySelectorAll(`[href=${p}]`)).map((i) => i.href = val);
Array.prototype.slice.call(el.querySelectorAll(`[value=${p}]`)).map((i) => i.value = val);
}
} catch(err) {
if (verbose) console.log("Unable to _replacetexts on",prefix,prop,err.message); // Continue loop its probably just some property of some nested object
}
}
}
}
function addtemplatedchild(el, {templatename="template"}={}, ...dict) {
/*
Standardised tool to add fields to html, add that as the last child (or children) of el
The slightly convulated way of doing this is because of the limited set of functions available
Note this has to be done with care, as "dict" may be user supplied and contain HTML or other malicious content
el: An HTML element, or a string with the id of one.
html: html to add under outerelement
dict: Dictionary with parameters to replace in html, it looks for nodes with name="xyz" and replaces text inside it with dict[xyz]
*/
el = elementFrom(el);
let el_li = el.getElementsByClassName(templatename)[0].cloneNode(true); // Copy first child with class=Template
el_li.classList.remove("template"); // Remove the "template" class so it displays
replacetexts(el_li, ...dict); // Safe since only replace text - sets el_li.source to dict
el.appendChild(el_li);
return el_li;
}
function show(el, displayvalue) {
displayvalue = displayvalue || "";
if (Array.isArray(el)) el.map((e) => show(e, displayvalue));
elementFrom(el).style.display = displayvalue;
}
function hide(el) {
if (Array.isArray(el)) el.map((e) => hide(e));
elementFrom(el).style.display = "none";
}
async function p_httpget(url, headers) {
//https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
/* Simple Get of a URL, resolves to either json or text depending on mimetype */
h = new Headers( headers ? headers : {} );
try {
let response = await fetch(new Request(url, {
method: 'GET',
headers: h,
mode: 'cors',
cache: 'default',
redirect: 'follow', // Chrome defaults to manual
})); // A promise, throws (on Chrome, untested on Ffox or Node) TypeError: Failed to fetch)
if (response.ok) {
if (response.headers.get('Content-Type') === "application/json") { // It should always be JSON
return response.json(); // promise resolving to JSON
} else {
return response.text(); // promise resolving to text
}
}
throw new Error(`Transport Error ${response.status}: ${response.statusText}`); // Should be TransportError but out of scope
} catch(err) {
// Error here is particularly unhelpful - if rejected during the COrs process it throws a TypeError
console.log("Probably misleading error from fetch:", url, err);
throw new Error(`Transport error thrown by ${url}`)
}
}
function display_blob(bb, options) {
/*
Display a blob of data
Typical usage display_blob(await Dweb.Transports.p_rawfetch(urls), {type: "application/pdf"})
bb: Data to display, either as blob or something that can be passed to Blob([bb]) e.g. a buffer
options: {
type: mimetype (required if bb not already a blob)
target: Where to display e.g. "_blank" or "_self"
}
TODO probably extend this to do a download which has some code in archive/*js to handle
*/
// See https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL
// and https://stackoverflow.com/questions/3665115/create-a-file-in-memory-for-user-to-download-not-through-server
if (!(bb instanceof Blob)) {
console.log("display_blob: creating with type",options.type);
bb = new Blob([bb], {type: options.type})
}
console.log("display_blob:",typeof bb);
// This next code is bizarre combination needed to open a blob from within an HTML window.
let a = window.document.createElement('a');
//bb = new Blob([datapdf], {type: 'application/pdf'});
let objectURL = URL.createObjectURL(bb);
a.href = objectURL;
a.target= (options && options.target) || "_blank"; // Open in new window by default
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
//URL.revokeObjectURL(objectURL) //TODO figure out when can do this - maybe last one, or maybe dont care?
}
//------- For dealing with MCE editor ----------
function seteditor(content) {
tinyMCE.activeEditor.setContent(content); // Set actual MCE editing text
tinyMCE.activeEditor.setDirty(true); // Allow saving this restored text
}
function starteditor() {
//TODO maybe add some options that can override fields if needed (e.g. with a Object.assign
tinymce.init({
selector: '#mytextarea',
menubar: "true",
plugins: [ "save",
'advlist autolink lists link image charmap print preview anchor',
'searchreplace visualblocks code fullscreen',
'insertdatetime media table contextmenu paste code' ],
toolbar: 'save | undo redo | insert | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image',
save_onsavecallback: () => p_updatecontent(tinyMCE.get('mytextarea').getContent()) // This function must be provided
});
}

272
loginutils.js Normal file
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@ -0,0 +1,272 @@
/*
A set of common scripts for use in Dweb code to add key management and login functionality
See example_versions.html for some usage and example_keys.html for instructions.
Requires Dweb to point to top level (e.g. by loading src="dweb_bundled.js"
keychains_ul should be something like:
<ul id="keychains_ul"><li class='template vertical_li' onclick='keychain_click(this);'><span name='name'>PLACEHOLDER</span></li></ul>
Needs a login and registration HTML
Naming conventions:
*/
// Array of images can use
const icon_images = { //!SEE-OTHER-KC-CLASSES
acl: "noun_1093404_cc.png",
kp: "noun_1146472_cc.png",
"tok": "noun_708669_cc.png",
"vl": "log.gif", // TODO replace by better icon
"locked": "noun_1093404_cc.png",
"unlocked": "noun_1093404_cc_unlocked.png",
}; //If change here - see also Keys on KeyChain code below
function logout_click() {
/* Logout button clicked - logged out*/
Dweb.KeyChain.logout(); // Empty keychains
deletechildren("keychains_ul"); // Delete any visible children
hide('logout'); // Nothing remains to logout so hide button
}
async function p_login(dict) {
/* common routine to login someone by name and passphrase, and display in KeyChains list - note
:param dict: {name: passprase: } or name of form containing it.
:resolves to: undefined
*/
// concatenate them so that a common passphrase isn't sufficient to guess an id.
if (typeof(dict) === "string") dict = form2dict(dict);
try {
let passphrase = dict.name + "/" + dict.passphrase;
let kc = await Dweb.KeyChain.p_new({name: dict.name}, {passphrase: passphrase}, verbose);
addtemplatedchild("keychains_ul", {}, kc); // returns el, but unused
show('logout'); // And show the logout button
} catch(err) {
console.log("Unable to _login",err);
alert(err);
}
}
async function registrationsubmit() {
/* User has filled in and submitted the registration button */
if (verbose) console.group("p_registrationsubmit ---");
hide('registrationform'); // Hide after submission
await p_login("registrationform"); // { name, passphrase }
if (verbose) console.groupEnd("p_registrationsubmit ---");
}
async function loginformsubmit() {
/* Login button clicked - User has logged in */
// At the moment this is identical behavior to p_registrationsubmit, but that could change
//TODO - check if user already exists, require "registration if not
if (verbose) console.group("loginformsubmit ---");
hide('loginform'); // Hide after submission
await p_login("loginform"); // { name, passphrase }
if (verbose) console.groupEnd("loginformsubmit -GROUP--");
}
function _showkeyorlock(el, obj) {
// Utility function to add new or existing element to Key List
addtemplatedchild(el, {}, obj, {objsym: icon_images[obj.table === "sd" && obj.token ? "tok" : obj.table ] });
}
function keychain_click(el) {
/* Click on a KeyChain i.e. on a login - display list of Keys and Locks for that login */
let kc = el.source; // Find KeyChain clicked on
show('keychain'); // Show the div 'keys' for showing keylist
let el_keychain_header = replacetexts("keychain_header", kc); // Set name fields etc in keylistdiv, sets source - dont set in keychain as will get list wrong
deletechildren("keychain_ul"); // Delete any locks or eys currently displayed
kc.addEventListener("insert", (event) => { // Setup a listener that will trigger when anything added to the list and update HTML
if (verbose) console.log("keychain.eventlistener",event);
let sig = event.detail;
if (Dweb.utils.intersects(kc._publicurls, el_keychain_header.source._publicurls)) // Check its still this KeyChain being displayed in keylist
sig.p_fetchdata({verbose}) // Get the data from a sig, its not done automatically as in other cases could be large
.then((obj) => _showkeyorlock("keychain_ul", obj)) // Show on the list
});
kc.p_list_then_elements({verbose, ignoreerrors: true}) // Retrieve the keys for the keylist - ignore any cant decrypt
.then(() => kc._keys.map((key)=> _showkeyorlock("keychain_ul", key))); // And add to the HTML
}
async function kcitem_click(el) { //!SEE-OTHER-KC-CLASSES
// Clicked on a key or a lock, determine which and forward
el = elementFrom(el);
let obj = el.source;
if (obj instanceof Dweb.AccessControlList)
await p_lock_click(el);
else if (obj instanceof Dweb.KeyPair)
key_click(el);
else if (obj instanceof Dweb.VersionList)
await p_versionlist_click(el);
else if ((obj instanceof Dweb.SmartDict) && obj.token) // Its a token - like a key
token_click(el);
else
throw new errors.ToBeImplementedError(`kcitem_click doesnt support ${obj.constructor.name}`)
}
//!SEE-OTHER-KC-CLASSES
// Clicked on a key, display a prompt to copy it for sharing
function locklink_click(el) {
window.prompt("Copy to clipboard for locking (Ctrl-C + OK)", elementFrom(el).source._urls);
}
function key_click(el) {
window.prompt("Copy to clipboard for sharing (Ctrl-C + OK)", elementFrom(el).source._publicurls);
}
function token_click(el) {
window.prompt("Copy to clipboard for sharing (Ctrl-C + OK)", elementFrom(el).source.viewer);
}
async function p_versionlist_click(el) {
// If there is a vl_target element then use it - e.g. for editing a VersionList, otherwise offer dialog to copy the URL
let target = elementFrom("vl_target");
if (target) {
await p_vl_target_display(target, elementFrom(el).source); // Application dependent
} else {
window.prompt("Copy to clipboard for sharing (Ctrl-C + OK)", elementFrom(el).source._urls); // In some cases should load form
}
}
async function keynew_click() {
if (verbose) console.group("keynew_click ---");
hide('keynew_form');
let dict = form2dict("keynew_form"); //name
let keychain = document.getElementById('keychain_header').source; // Keychain of parent of this dialog
let key = new Dweb.KeyPair({name: dict.name, key: {keygen: true}, _acl: keychain}, verbose ); // Doesnt store
_showkeyorlock("keychain_ul", key); // Put in UI, as listmonitor response will be deduplicated.
await keychain.p_push(key, verbose); // Will store on the way
if (verbose) console.groupEnd("keynew_click ---");
}
async function locknew_click() {
if (verbose) console.group("locknew_click ---");
hide('locknew_form');
let dict = form2dict("locknew_form"); //name
let keychain = document.getElementById('keychain_header').source; // The KeyChain being added to.
let res = await Dweb.AccessControlList.p_new({name: dict.name, _acl: keychain}, true, {keygen: true}, verbose, null, keychain ) //(data, master, key, verbose, options, kc)
.then((acl) => _showkeyorlock("keychain_ul", acl)); // Put in UI, as listmonitor return rejected as duplicate
if (verbose) console.groupEnd("locknew_click ---");
return res;
}
async function p_lock_click(el) {
if (verbose) console.group("p_lock_click ---");
let acl = el.source; // The ACL clicked on
show('lock_div'); // Show the HTML with a list of tokens in ACL
let el_lockheader = replacetexts("lock_header", acl); // Set name fields etc in keylistdiv, sets source
deletechildren("lock_ul"); // Remove any existing HTML children
try {
let toks = await acl.p_tokens(); // Retrieve the keys for the keylist
toks.map((tok) => _showkeyorlock("lock_ul", tok)); // And add to the HTML
acl.addEventListener("insert", (event) => { // Setup a listener that will trigger when anything added to the list and update HTML
if (verbose) console.log("lock.eventlistener",event);
let sig = event.detail;
if (Dweb.utils.intersects(acl._publicurls, el_lockheader.source._publicurls)) // Check its still this ACL being displayed in keylist
sig.p_fetchdata({verbose}) // Get the data from a sig, its not done automatically as in other cases could be large
.then((tok) => _showkeyorlock("lock_ul", tok)) // Show on the list
});
} catch(err) {
console.log("p_lock_click: failed",err.message);
throw err;
}
if (verbose) console.groupEnd("p_lock_click ---");
}
async function tokennew_click() { //Called by "Add" button on new token dialog
//TODO this allows duplicates, shouldnt add if viewer matches
if (verbose) console.group("tokennew_click ---");
hide('tokennew_form');
let dict = form2dict("tokennew_form"); //url
let acl = document.getElementById('lock_header').source;
let tok = await acl.p_add_acle(urlsFrom(dict.urls), {name: dict["name"]}, verbose);
_showkeyorlock("lock_ul", tok) // Push to visual list, as listmonitor will be a duplicate
if (verbose) console.groupEnd("tokennew_click ---");
}
/* Need stuff below this line */
function createElement(tag, attrs, children) { // Note arguments is set to tag, attrs, child1, child2 etc
var element = document.createElement(tag);
for (let name in attrs) {
let attrname = (name.toLowerCase() === "classname" ? "class" : name);
if (name === "dangerouslySetInnerHTML") {
element.innerHTML = attrs[name]["__html"];
delete attrs.dangerouslySetInnerHTML;
}
if (attrs.hasOwnProperty(name)) {
let value = attrs[name];
if (value === true) {
element.setAttribute(attrname, name);
} else if (typeof value === "object" && !Array.isArray(value)) { // e.g. style: {{fontSize: "124px"}}
if (["style"].includes(attrname)) {
for (let k in value) {
element[attrname][k] = value[k];
}
} else {
// Assume we are really trying to set the value to an object, allow it
element[attrname] = value; // Wont let us use setAttribute(attrname, value) unclear if because unknow attribute or object
}
} else if (value !== false && value != null) {
element.setAttribute(attrname, value.toString());
}
}
}
for (let i = 2; i < arguments.length; i++) { // Everything after attrs
let child = arguments[i];
if (!child) {
} else if (Array.isArray(child)) {
child.map((c) => element.appendChild(c.nodeType == null ?
document.createTextNode(c.toString()) : c))
}
else {
element.appendChild(
child.nodeType == null ?
document.createTextNode(child.toString()) : child);
}
}
return element;
}
async function p_connect(options) {
/*
This is a standardish starting process, feel free to copy and reuse !
options = { defaulttransports: ["IPFS"]; statuselement: el }
*/
if (verbose) console.group("p_connect ---");
try {
options = options || {};
let setupoptions = {};
let tabbrevs = searchparams.getAll("transport"); // Array of transports
if (!tabbrevs.length) { tabbrevs = options.defaulttransports || [] }
if (!tabbrevs.length) { tabbrevs = ["HTTP", "YJS", "IPFS", "WEBTORRENT"]; }
tabbrevs = tabbrevs.map(n => n.toUpperCase());
let transports = DwebTransports.setup0(tabbrevs, options, verbose);
while (statuselement.lastChild) { el.removeChild(el.lastChild); } // Remove any exist status
statuselement.appendChild(
createElement("UL",{}, transports.map(t => {
el = createElement("LI", {onclick: "transportclick(this);", source: t}, t.name)
t.statuselement = el; // Save status element on transport
return el;
}
)));
await DwebTransports.p_setup1(verbose, refreshstatus);
await DwebTransports.p_setup2(verbose, refreshstatus);
} catch(err) {
console.error("ERROR in p_connect:",err.message);
throw(err);
}
if (verbose) console.groupEnd("p_connect ---");
}
function refreshstatus(t) {
statusclasses = ["transportstatus0","transportstatus1","transportstatus2","transportstatus3","transportstatus4"];
let el = t.statuselement;
el.classList.remove(...statusclasses);
el.classList.add(statusclasses[t.status]);
}
function transportclick(el) { // Similar routines to this could display status, toggle activity etc.
t = el.source;
console.log("Clicked on Transport",t.name);
t.togglePaused(refreshstatus);
}

2
utils.js
View File

@ -115,4 +115,6 @@ utils.p_timeout = function(promise, ms, errorstr) {
]);
}
/*TODO backport these to utils.js in main repo */
exports = module.exports = utils;