374 lines
9.3 KiB
JavaScript
374 lines
9.3 KiB
JavaScript
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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import { uniq } from 'lodash';
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import store from 'store';
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import Api from './api';
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import { LOG_KEYS, getLogger } from '~/config';
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const log = getLogger(LOG_KEYS.Signer);
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export default class SecureApi extends Api {
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_isConnecting = false;
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_needsToken = false;
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_tokens = [];
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_dappsInterface = null;
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_dappsPort = 8080;
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_signerPort = 8180;
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static getTransport (url, sysuiToken) {
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return new Api.Transport.Ws(url, sysuiToken, false);
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}
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constructor (url, nextToken, getTransport = SecureApi.getTransport) {
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const sysuiToken = store.get('sysuiToken');
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const transport = getTransport(url, sysuiToken);
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super(transport);
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this._url = url;
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// Try tokens from localStorage, from hash and 'initial'
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this._tokens = uniq([sysuiToken, nextToken, 'initial'])
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.filter((token) => token)
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.map((token) => ({ value: token, tried: false }));
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// When the transport is closed, try to reconnect
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transport.on('close', this.connect, this);
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this.connect();
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}
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get dappsPort () {
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return this._dappsPort;
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}
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get dappsUrl () {
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return `http://${this.hostname}:${this.dappsPort}`;
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}
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get hostname () {
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if (window.location.hostname === 'home.parity') {
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return 'dapps.parity';
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}
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if (!this._dappsInterface || this._dappsInterface === '0.0.0.0') {
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return window.location.hostname;
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}
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return this._dappsInterface;
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}
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get signerPort () {
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return this._signerPort;
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}
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get isConnecting () {
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return this._isConnecting;
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}
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get isConnected () {
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return this._transport.isConnected;
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}
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get needsToken () {
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return this._needsToken;
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}
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get secureToken () {
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return this._transport.token;
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}
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connect () {
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if (this._isConnecting) {
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return;
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}
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log.debug('trying to connect...');
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this._isConnecting = true;
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this.emit('connecting');
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// Reset the tested Tokens
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this._resetTokens();
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// Try to connect
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return this._connect()
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.then((connected) => {
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this._isConnecting = false;
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if (connected) {
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const token = this.secureToken;
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log.debug('got connected ; saving token', token);
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// Save the sucessful token
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this._saveToken(token);
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this._needsToken = false;
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// Emit the connected event
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return this.emit('connected');
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}
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// If not connected, we need a new token
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log.debug('needs a token');
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this._needsToken = true;
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return this.emit('disconnected');
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})
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.catch((error) => {
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this._isConnecting = false;
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log.debug('emitting "disconnected"');
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this.emit('disconnected');
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console.error('unhandled error in secureApi', error);
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});
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}
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/**
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* Returns a Promise that gets resolved with
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* a boolean: `true` if the node is up, `false`
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* otherwise (HEAD request to the Node)
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*/
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isNodeUp () {
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const url = this._url.replace(/wss?/, 'http');
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return fetch(url, { method: 'HEAD' })
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.then(
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(r) => r.status === 200,
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() => false
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)
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.catch(() => false);
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}
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/**
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* Update the given token, ie. add it to the token
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* list, and then try to connect (if not already connecting)
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*/
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updateToken (_token) {
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const token = this._sanitiseToken(_token);
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log.debug('updating token', token);
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// Update the tokens list: put the new one on first position
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this._tokens = [ { value: token, tried: false } ].concat(this._tokens);
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// Try to connect with the new token added
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return this.connect();
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}
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/**
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* Try to connect to the Node with the next Token in
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* the list
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*/
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_connect () {
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log.debug('trying next token');
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// Get the first not-tried token
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const nextToken = this._getNextToken();
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// If no more tokens to try, user has to enter a new one
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if (!nextToken) {
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return Promise.resolve(false);
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}
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nextToken.tried = true;
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return this._connectWithToken(nextToken.value)
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.then((validToken) => {
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// If not valid, try again with the next token in the list
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if (!validToken) {
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return this._connect();
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}
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// If correct and valid token, wait until the Node is ready
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// and resolve as connected
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return this._waitUntilNodeReady()
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.then(() => this._fetchSettings())
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.then(() => true);
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})
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.catch((error) => {
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log.error('unkown error in _connect', error);
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return false;
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});
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}
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/**
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* Connect with the given token.
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* It returns a Promise that gets resolved
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* with `validToken` as argument, whether the given token
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* is valid or not
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*/
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_connectWithToken (_token) {
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// Sanitize the token first
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const token = this._sanitiseToken(_token);
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// Update the token in the transport layer
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this.transport.updateToken(token, false);
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log.debug('connecting with token', token);
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return this.transport.connect()
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.then(() => {
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log.debug('connected with', token);
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if (token === 'initial') {
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return this._generateAuthorizationToken();
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}
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// The token is valid !
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return true;
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})
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.catch((error) => {
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// Log if it's not a close error (ie. wrong token)
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if (error && error.type !== 'close') {
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log.debug('did not connect ; error', error);
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}
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// Check if the Node is up
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return this.isNodeUp()
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.then((isNodeUp) => {
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// If it's not up, try again in a few...
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if (!isNodeUp) {
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const timeout = this.transport.retryTimeout;
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log.debug('node is not up ; will try again in', timeout, 'ms');
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return new Promise((resolve, reject) => {
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window.setTimeout(() => {
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this._connectWithToken(token).then(resolve).catch(reject);
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}, timeout);
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});
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}
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// The token is invalid
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log.debug('tried with a wrong token', token);
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return false;
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});
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});
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}
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/**
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* Retrieve the correct ports from the Node
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*/
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_fetchSettings () {
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return Promise
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.all([
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this.parity.dappsPort(),
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this.parity.dappsInterface(),
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this.parity.signerPort()
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])
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.then(([dappsPort, dappsInterface, signerPort]) => {
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this._dappsPort = dappsPort.toNumber();
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this._dappsInterface = dappsInterface;
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this._signerPort = signerPort.toNumber();
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});
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}
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/**
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* Try to generate an Authorization Token.
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* Then try to connect with the new token.
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*/
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_generateAuthorizationToken () {
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return this.signer
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.generateAuthorizationToken()
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.then((token) => this._connectWithToken(token));
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}
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/**
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* Get the next token to try, if any left
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*/
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_getNextToken () {
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// Get the first not-tried token
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const nextTokenIndex = this._tokens.findIndex((t) => !t.tried);
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// If no more tokens to try, user has to enter a new one
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if (nextTokenIndex < 0) {
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return null;
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}
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const nextToken = this._tokens[nextTokenIndex];
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return nextToken;
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}
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_resetTokens () {
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this._tokens = this._tokens.map((token) => ({
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...token,
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tried: false
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}));
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}
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_sanitiseToken (token) {
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return token.replace(/[^a-zA-Z0-9]/g, '');
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}
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_saveToken (token) {
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store.set('sysuiToken', token);
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}
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/**
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* Promise gets resolved when the node is up
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* and running (it might take some time before
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* the node is actually ready even when the client
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* is connected).
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*
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* We check that the `parity_netChain` RPC calls
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* returns successfully
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*/
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_waitUntilNodeReady (_timeleft) {
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// Default timeout to 30 seconds
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const timeleft = Number.isFinite(_timeleft)
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? _timeleft
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: 30 * 1000;
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// After timeout, just resolve the promise...
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if (timeleft <= 0) {
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console.warn('node is still not ready after 30 seconds...');
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return Promise.resolve(true);
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}
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const start = Date.now();
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return this
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.parity.netChain()
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.then(() => true)
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.catch((error) => {
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if (!error) {
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return true;
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}
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if (error.type !== 'NETWORK_DISABLED') {
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throw error;
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}
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// Timeout between 250ms and 750ms
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const timeout = Math.floor(250 + (500 * Math.random()));
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log.debug('waiting until node is ready', 'retry in', timeout, 'ms');
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// Retry in a few...
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return new Promise((resolve, reject) => {
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window.setTimeout(() => {
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const duration = Date.now() - start;
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this._waitUntilNodeReady(timeleft - duration).then(resolve).catch(reject);
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}, timeout);
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});
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});
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}
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}
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