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

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Mitra Ardron 2018-04-06 19:28:04 +10:00
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GNU AFFERO GENERAL PUBLIC LICENSE
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# DwebTransports
General transport library for Decentralized Web handles multiple underlying transports

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{
"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'"
}
}

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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;

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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;

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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;

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/*
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;

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/*
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;

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/*
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;

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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;

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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;