mirror of
https://github.com/fluencelabs/dweb-transports
synced 2025-03-15 10:30:48 +00:00
335 lines
16 KiB
JavaScript
335 lines
16 KiB
JavaScript
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") {
|
|
if (typeof(fetch) === "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, cb) {
|
|
this.status = Transport.STATUS_STARTING;
|
|
if (cb) cb(this);
|
|
await this.p_status(verbose);
|
|
if (cb) cb(this);
|
|
return this;
|
|
}
|
|
|
|
async p_status(verbose) {
|
|
/*
|
|
Return a numeric code for the status of a transport.
|
|
*/
|
|
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 super.p_status(verbose);
|
|
}
|
|
|
|
async p_httpfetch(httpurl, init, verbose) { // Embrace and extend "fetch" to check result etc.
|
|
/*
|
|
Fetch a url
|
|
|
|
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();
|
|
} 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=false}={}) {
|
|
// 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=false}={}) {
|
|
/*
|
|
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/${pathparts.slice(-1)}`
|
|
|
|
}
|
|
|
|
p_rawadd(url, sig, {verbose=false}={}) { //TODO-BACKPORT turn date into ISO before adding
|
|
//verbose=true;
|
|
if (!url || !sig) throw new errors.CodingError("TransportHTTP.p_rawadd: invalid parms",url, sig);
|
|
if (verbose) console.log("rawadd", url, sig);
|
|
let value = JSON.stringify(sig.preflight(Object.assign({},sig)))+"\n";
|
|
return this.p_POST(this._url(url, servercommands.rawadd), "application/json", value, verbose); // Returns immediately
|
|
}
|
|
|
|
p_newlisturls(cl, {verbose=false}={}) {
|
|
let u = cl._publicurls.map(urlstr => Url.parse(urlstr))
|
|
.find(parsedurl =>
|
|
(parsedurl.protocol === "https" && parsedurl.host === "gateway.dweb.me" && parsedurl.pathname.includes('/content/rawfetch'))
|
|
|| (parsedurl.protocol === "contenthash:" && (parsedurl.pathname.split('/')[1] === "contenthash")));
|
|
if (!u) {
|
|
u = `contenthash:/contenthash/${ 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=false}={}) {
|
|
//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=false}={}) {
|
|
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=false}={}) { // 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=${encodeURIComponent(key)}`
|
|
}
|
|
async p_get(url, keys, {verbose=false}={}) {
|
|
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
|
|
let parmstr =Array.isArray(keys) ? keys.map(k => this._keyparm(k)).join('&') : this._keyparm(keys)
|
|
let res = await this.p_GET(this._url(url, servercommands.get, parmstr), {verbose});
|
|
return Array.isArray(keys) ? res : res[keys]
|
|
}
|
|
|
|
async p_delete(url, keys, {verbose=false}={}) { //TODO-KEYVALUE-API need to think this one through
|
|
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
|
|
let parmstr = keys.map(k => this._keyparm(k)).join('&');
|
|
await this.p_GET(this._url(url, servercommands.delete, parmstr), {verbose});
|
|
}
|
|
|
|
async p_keys(url, {verbose=false}={}) {
|
|
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
|
|
return await this.p_GET(this._url(url, servercommands.keys), {verbose});
|
|
}
|
|
async p_getall(url, {verbose=false}={}) {
|
|
if (!url && keys) throw new errors.CodingError("TransportHTTP.p_get: requires url and at least one key");
|
|
return await this.p_GET(this._url(url, servercommands.getall), {verbose});
|
|
}
|
|
/* Make sure doesnt shadow regular p_rawfetch
|
|
async p_rawfetch(url, verbose) {
|
|
return {
|
|
table: "keyvaluetable",
|
|
_map: await this.p_getall(url, {verbose})
|
|
}; // Data struc is ok as SmartDict.p_fetch will pass to KVT constructor
|
|
}
|
|
*/
|
|
|
|
p_info(verbose) { return this.p_GET(`${this.urlbase}/info`, {verbose}); }
|
|
|
|
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;
|
|
|