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weh-background.js
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225 lines (203 loc) · 4.76 KB
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/*
* weh - WebExtensions Helper
*
* @summary workflow and base code for developing WebExtensions browser add-ons
* @author Michel Gutierrez
* @link https://github.com/mi-g/weh
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
var weh = require('weh');
var browser = weh.browser;
var apps = {};
weh.rpc = require('weh-rpc');
//weh.rpc.setDebug(2);
weh.rpc.setUseTarget(true);
weh.rpc.setPost((app,message)=>{
var appOptions = apps[app];
if(appOptions && appOptions.port)
appOptions.port.postMessage(message);
});
weh.rpc.listen({
appStarted: (options) => {
},
appReady: (app) => {
},
closePanel: (app) => {
weh.ui.close(app);
}
});
browser.runtime.onConnect.addListener((port) => {
var m = /^weh:(.*?):(.*)/.exec(port.name);
if(!m)
return;
port.onMessage.addListener((message) => {
if(typeof message._method !== "undefined" && (message._method==="appStarted" || message._method==="appReady")) {
var app = message._args[0] && message._args[0].uiName || null;
var appOptions = apps[app] || {
ready: false
};
apps[app] = appOptions;
Object.assign(appOptions,message._args[0],{ port: port });
if(message._method=="appReady") {
appOptions.ready = true;
if(appOptions.initData)
setTimeout(()=>{
weh.rpc.call(app,"wehInitData",appOptions.initData);
},0);
var wait = waiting[app];
if(wait && wait.timer) {
clearTimeout(wait.timer);
delete wait.timer;
}
}
port._weh_app = app;
}
weh.rpc.receive(message,port.postMessage.bind(port),port._weh_app);
});
port.onDisconnect.addListener(() => {
var app = port._weh_app;
if(app) {
delete apps[app];
var wait = waiting[app];
if(wait) {
if(wait.timer)
clearTimeout(wait.timer);
delete waiting[app];
wait.reject(new Error("Disconnected waiting for "+app));
}
}
});
});
weh.__declareAppTab = function(app,data) {
if(!apps[app])
apps[app] = {};
Object.assign(apps[app],data);
}
weh.__closeByTab = function(tabId) {
Object.keys(apps).forEach((app)=>{
var appOptions = apps[app];
if(appOptions.tab===tabId) {
delete apps[app];
var wait = waiting[app];
if(wait) {
if(wait.timer)
clearTimeout(wait.timer);
delete waiting[app];
wait.reject(new Error("Disconnected waiting for "+app));
}
}
});
}
weh._ = require('weh-i18n').getMessage;
weh.ui = require('weh-ui');
weh.openedContents = () => Object.keys(apps);
var wehPrefs = require('weh-prefs');
weh.prefs = wehPrefs;
function Hash(str){
var hash = 0, char;
if (str.length === 0) return hash;
for(var i=0; i<str.length; i++) {
char = str.charCodeAt(i);
hash = ((hash<<5)-hash)+char;
hash = hash & hash;
}
return hash;
}
function Stringify(object) {
return JSON.stringify(Object.keys(object).sort().map(function(k) {
return {
name: k,
value: object[k]
}
}));
}
function Parse(str) {
var object = {};
JSON.parse(str).forEach(function(pair) {
object[pair.name] = pair.value;
});
return object;
}
var lastHash = 0;
var prefs = {};
try {
var prefsStr = localStorage.getItem("weh-prefs");
if(prefsStr===null) {
browser.storage.local.get("weh-prefs")
.then((result)=>{
var wePrefs = result["weh-prefs"];
if(wePrefs)
wehPrefs.assign(wePrefs);
})
} else {
prefs = Parse(prefsStr);
lastHash = Hash(prefsStr);
}
} catch(e) {}
wehPrefs.assign(prefs);
wehPrefs.on("",{
pack: true
},function(newPrefs,oldPrefs) {
Object.assign(prefs,newPrefs);
var prefsStr = Stringify(prefs);
var hash = Hash(prefsStr);
if(hash!=lastHash) {
lastHash = hash;
localStorage.setItem("weh-prefs",prefsStr);
browser.storage.local.set({
"weh-prefs": prefs
});
}
Object.keys(apps).forEach((app)=>{
var appOptions = apps[app];
if(appOptions.usePrefs) {
weh.rpc.call(app,"setPrefs",newPrefs);
}
});
});
const waiting = {};
weh.wait = (id,options={}) => {
var wait = waiting[id];
if(wait) {
if(wait.timer)
clearTimeout(wait.timer);
delete waiting[id];
wait.reject(new Error("Waiter for "+id+" overriden"));
}
return new Promise((resolve, reject) => {
waiting[id] = {
resolve,
reject,
timer: setTimeout(()=>{
delete waiting[id];
reject(new Error("Waiter for "+id+" timed out"));
}, options.timeout || 60000)
}
});
}
weh.rpc.listen({
prefsGetAll: () => {
return wehPrefs.getAll();
},
prefsGetSpecs: () => {
return wehPrefs.getSpecs();
},
prefsSet: (prefs) => {
return wehPrefs.assign(prefs);
},
trigger: (id,result) => {
var wait = waiting[id];
if(!wait)
throw new Error("No waiter for",id);
if(wait.timer) {
clearTimeout(wait.timer);
delete wait.timer;
}
delete waiting[id];
wait.resolve(result);
}
});
module.exports = weh;