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SocketService.js
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SocketService.js
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import StorageService from './StorageService'
import getRandomValues from 'get-random-values';
import createHash from 'create-hash';
import WebSocket from 'isomorphic-ws';
const suffix = '/socket.io/?EIO=3&transport=websocket';
let socket = null;
let connected = false;
let paired = false;
let plugin;
let openRequests = [];
let allowReconnects = true;
let reconnectionTimeout = null;
const sha256 = data => createHash('sha256').update(data).digest('hex');
const random = () => {
const array = new Uint8Array(24);
getRandomValues(array);
return array.join('');
};
const getOrigin = () => {
let origin;
if (typeof location !== 'undefined')
if (location.hasOwnProperty('hostname') && location.hostname.length && location.hostname !== 'localhost')
origin = location.hostname;
else origin = plugin;
else origin = plugin;
if (origin.substr(0, 4) === 'www.') origin = origin.replace('www.', '');
return origin;
}
let appkey = StorageService.getAppKey();
if (!appkey) appkey = 'appkey:' + random();
const send = (type = null, data = null) => {
if (type === null && data === null) socket.send('40/Cocos-BCX');
else socket.send('42/Cocos-BCX,' + JSON.stringify([type, data]));
}
let pairingPromise = null;
const pair = (passthrough = false) => {
return new Promise((resolve, reject) => {
pairingPromise = {
resolve,
reject
};
send('pair', {
data: {
appkey,
origin: getOrigin(),
passthrough
},
plugin
})
})
};
let eventHandlers = {};
export default class SocketService {
static init(_plugin, timeout = 600000) {
plugin = _plugin;
this.timeout = timeout;
}
static getOrigin() {
return getOrigin();
}
static addEventHandler(handler, key) {
if (!key) key = 'app';
eventHandlers[key] = handler;
}
static removeEventHandler(key) {
if (!key) key = 'app';
delete eventHandlers[key];
}
static link() {
return Promise.race([
new Promise((resolve, reject) => setTimeout(() => {
if (connected) return;
resolve(false);
if (socket) {
socket.disconnect();
socket = null;
}
}, this.timeout)),
new Promise(async (resolve, reject) => {
const setupSocket = () => {
socket.onmessage = msg => {
if (msg.data.indexOf('42/Cocos-BCX') === -1) return false;
const [type, data] = JSON.parse(msg.data.replace('42/Cocos-BCX,', ''));
switch (type) {
case 'paired':
return msg_paired(data);
case 'rekey':
return msg_rekey();
case 'api':
return msg_api(data);
case 'event':
return event_api(data);
}
};
const msg_paired = result => {
paired = result;
if (paired) {
const savedKey = StorageService.getAppKey();
const hashed = appkey.indexOf('appkey:') > -1 ? sha256(appkey) : appkey;
if (!savedKey || savedKey !== hashed) {
StorageService.setAppKey(hashed);
appkey = StorageService.getAppKey();
}
}
pairingPromise.resolve(result);
};
const msg_rekey = () => {
appkey = 'appkey:' + random();
send('rekeyed', {
data: {
appkey,
origin: getOrigin()
},
plugin
});
};
const msg_api = response => {
if (!response) return
const openRequest = openRequests.find(x => x.id === response.id);
if (!openRequest) return
openRequests = openRequests.filter(x => x.id !== response.id);
const isErrorResponse = typeof response.result === 'object' &&
response.result !== null &&
response.result.hasOwnProperty('isError');
if (isErrorResponse) openRequest.reject(response.result);
else openRequest.resolve(response.result);
};
const event_api = ({
event,
payload
}) => {
if (Object.keys(eventHandlers).length) Object.keys(eventHandlers).map(key => {
eventHandlers[key](event, payload);
});
};
};
const trySocket = (resolver = null) => {
let promise;
if (!resolver) promise = new Promise(r => resolver = r);
const hostname = '127.0.0.1:50005';
const protocol = 'ws://';
const host = `${protocol}${hostname}${suffix}`;
const s = new WebSocket(host);
s.onerror = err => {
resolve(false);
resolver(false);
};
s.onopen = () => {
socket = s;
send();
clearTimeout(reconnectionTimeout);
connected = true;
pair(true).then(() => {
resolve(true);
resolver(true);
});
setupSocket();
};
return promise;
};
await trySocket();
})
])
}
static isConnected() {
return connected;
}
static isPaired() {
return paired;
}
static disconnect() {
if (socket) socket.close();
return true;
}
static removeAppKeys() {
StorageService.removeAppKey();
StorageService.removeNonce();
}
static sendApiRequest(request) {
return new Promise((resolve, reject) => {
if (request.type === 'identityFromPermissions' && !paired) return resolve(false)
pair().then(() => {
if (!paired) return reject({
code: 'not_paired',
message: 'The user did not allow this app to connect to their Cocos'
});
// Request ID used for resolving promises
request.id = random()
// Set Application Key
request.appkey = appkey;
// Nonce used to authenticate this request
request.nonce = StorageService.getNonce() || 0;
// Next nonce used to authenticate the next request
const nextNonce = random();
request.nextNonce = sha256(nextNonce);
StorageService.setNonce(nextNonce);
if (request.hasOwnProperty('payload') && !request.payload.hasOwnProperty('origin'))
request.payload.origin = getOrigin();
openRequests.push(Object.assign(request, {
resolve,
reject
}));
send('api', {
data: request,
plugin
})
})
});
}
}