зеркало из https://github.com/mozilla/gecko-dev.git
652 строки
18 KiB
JavaScript
652 строки
18 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
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this.EXPORTED_SYMBOLS = ["CommonUtils"];
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Cu.import("resource://gre/modules/Promise.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/osfile.jsm")
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Cu.import("resource://gre/modules/Log.jsm");
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this.CommonUtils = {
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/*
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* Set manipulation methods. These should be lifted into toolkit, or added to
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* `Set` itself.
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*/
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/**
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* Return elements of `a` or `b`.
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*/
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union: function (a, b) {
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let out = new Set(a);
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for (let x of b) {
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out.add(x);
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}
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return out;
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},
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/**
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* Return elements of `a` that are not present in `b`.
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*/
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difference: function (a, b) {
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let out = new Set(a);
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for (let x of b) {
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out.delete(x);
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}
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return out;
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},
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/**
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* Return elements of `a` that are also in `b`.
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*/
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intersection: function (a, b) {
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let out = new Set();
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for (let x of a) {
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if (b.has(x)) {
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out.add(x);
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}
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}
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return out;
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},
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/**
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* Return true if `a` and `b` are the same size, and
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* every element of `a` is in `b`.
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*/
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setEqual: function (a, b) {
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if (a.size != b.size) {
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return false;
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}
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for (let x of a) {
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if (!b.has(x)) {
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return false;
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}
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}
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return true;
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},
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// Import these from Log.jsm for backward compatibility
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exceptionStr: Log.exceptionStr,
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stackTrace: Log.stackTrace,
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/**
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* Encode byte string as base64URL (RFC 4648).
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*
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* @param bytes
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* (string) Raw byte string to encode.
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* @param pad
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* (bool) Whether to include padding characters (=). Defaults
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* to true for historical reasons.
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*/
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encodeBase64URL: function encodeBase64URL(bytes, pad=true) {
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let s = btoa(bytes).replace("+", "-", "g").replace("/", "_", "g");
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if (!pad) {
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s = s.replace("=", "", "g");
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}
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return s;
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},
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/**
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* Create a nsIURI instance from a string.
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*/
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makeURI: function makeURI(URIString) {
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if (!URIString)
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return null;
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try {
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return Services.io.newURI(URIString, null, null);
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} catch (e) {
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let log = Log.repository.getLogger("Common.Utils");
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log.debug("Could not create URI: " + CommonUtils.exceptionStr(e));
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return null;
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}
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},
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/**
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* Execute a function on the next event loop tick.
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*
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* @param callback
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* Function to invoke.
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* @param thisObj [optional]
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* Object to bind the callback to.
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*/
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nextTick: function nextTick(callback, thisObj) {
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if (thisObj) {
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callback = callback.bind(thisObj);
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}
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Services.tm.currentThread.dispatch(callback, Ci.nsIThread.DISPATCH_NORMAL);
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},
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/**
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* Return a promise resolving on some later tick.
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*
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* This a wrapper around Promise.resolve() that prevents stack
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* accumulation and prevents callers from accidentally relying on
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* same-tick promise resolution.
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*/
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laterTickResolvingPromise: function (value, prototype) {
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let deferred = Promise.defer(prototype);
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this.nextTick(deferred.resolve.bind(deferred, value));
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return deferred.promise;
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},
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/**
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* Spin the event loop and return once the next tick is executed.
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*
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* This is an evil function and should not be used in production code. It
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* exists in this module for ease-of-use.
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*/
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waitForNextTick: function waitForNextTick() {
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let cb = Async.makeSyncCallback();
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this.nextTick(cb);
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Async.waitForSyncCallback(cb);
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return;
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},
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/**
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* Return a timer that is scheduled to call the callback after waiting the
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* provided time or as soon as possible. The timer will be set as a property
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* of the provided object with the given timer name.
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*/
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namedTimer: function namedTimer(callback, wait, thisObj, name) {
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if (!thisObj || !name) {
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throw "You must provide both an object and a property name for the timer!";
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}
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// Delay an existing timer if it exists
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if (name in thisObj && thisObj[name] instanceof Ci.nsITimer) {
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thisObj[name].delay = wait;
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return;
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}
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// Create a special timer that we can add extra properties
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let timer = {};
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timer.__proto__ = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
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// Provide an easy way to clear out the timer
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timer.clear = function() {
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thisObj[name] = null;
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timer.cancel();
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};
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// Initialize the timer with a smart callback
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timer.initWithCallback({
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notify: function notify() {
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// Clear out the timer once it's been triggered
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timer.clear();
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callback.call(thisObj, timer);
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}
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}, wait, timer.TYPE_ONE_SHOT);
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return thisObj[name] = timer;
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},
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encodeUTF8: function encodeUTF8(str) {
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try {
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str = this._utf8Converter.ConvertFromUnicode(str);
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return str + this._utf8Converter.Finish();
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} catch (ex) {
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return null;
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}
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},
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decodeUTF8: function decodeUTF8(str) {
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try {
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str = this._utf8Converter.ConvertToUnicode(str);
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return str + this._utf8Converter.Finish();
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} catch (ex) {
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return null;
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}
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},
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byteArrayToString: function byteArrayToString(bytes) {
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return [String.fromCharCode(byte) for each (byte in bytes)].join("");
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},
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stringToByteArray: function stringToByteArray(bytesString) {
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return [String.charCodeAt(byte) for each (byte in bytesString)];
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},
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bytesAsHex: function bytesAsHex(bytes) {
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return [("0" + bytes.charCodeAt(byte).toString(16)).slice(-2)
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for (byte in bytes)].join("");
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},
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stringAsHex: function stringAsHex(str) {
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return CommonUtils.bytesAsHex(CommonUtils.encodeUTF8(str));
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},
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stringToBytes: function stringToBytes(str) {
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return CommonUtils.hexToBytes(CommonUtils.stringAsHex(str));
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},
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hexToBytes: function hexToBytes(str) {
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let bytes = [];
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for (let i = 0; i < str.length - 1; i += 2) {
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bytes.push(parseInt(str.substr(i, 2), 16));
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}
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return String.fromCharCode.apply(String, bytes);
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},
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hexAsString: function hexAsString(hex) {
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return CommonUtils.decodeUTF8(CommonUtils.hexToBytes(hex));
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},
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/**
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* Base32 encode (RFC 4648) a string
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*/
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encodeBase32: function encodeBase32(bytes) {
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const key = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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let quanta = Math.floor(bytes.length / 5);
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let leftover = bytes.length % 5;
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// Pad the last quantum with zeros so the length is a multiple of 5.
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if (leftover) {
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quanta += 1;
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for (let i = leftover; i < 5; i++)
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bytes += "\0";
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}
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// Chop the string into quanta of 5 bytes (40 bits). Each quantum
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// is turned into 8 characters from the 32 character base.
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let ret = "";
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for (let i = 0; i < bytes.length; i += 5) {
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let c = [byte.charCodeAt() for each (byte in bytes.slice(i, i + 5))];
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ret += key[c[0] >> 3]
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+ key[((c[0] << 2) & 0x1f) | (c[1] >> 6)]
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+ key[(c[1] >> 1) & 0x1f]
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+ key[((c[1] << 4) & 0x1f) | (c[2] >> 4)]
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+ key[((c[2] << 1) & 0x1f) | (c[3] >> 7)]
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+ key[(c[3] >> 2) & 0x1f]
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+ key[((c[3] << 3) & 0x1f) | (c[4] >> 5)]
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+ key[c[4] & 0x1f];
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}
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switch (leftover) {
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case 1:
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return ret.slice(0, -6) + "======";
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case 2:
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return ret.slice(0, -4) + "====";
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case 3:
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return ret.slice(0, -3) + "===";
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case 4:
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return ret.slice(0, -1) + "=";
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default:
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return ret;
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}
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},
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/**
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* Base32 decode (RFC 4648) a string.
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*/
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decodeBase32: function decodeBase32(str) {
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const key = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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let padChar = str.indexOf("=");
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let chars = (padChar == -1) ? str.length : padChar;
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let bytes = Math.floor(chars * 5 / 8);
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let blocks = Math.ceil(chars / 8);
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// Process a chunk of 5 bytes / 8 characters.
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// The processing of this is known in advance,
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// so avoid arithmetic!
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function processBlock(ret, cOffset, rOffset) {
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let c, val;
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// N.B., this relies on
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// undefined | foo == foo.
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function accumulate(val) {
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ret[rOffset] |= val;
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}
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function advance() {
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c = str[cOffset++];
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if (!c || c == "" || c == "=") // Easier than range checking.
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throw "Done"; // Will be caught far away.
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val = key.indexOf(c);
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if (val == -1)
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throw "Unknown character in base32: " + c;
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}
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// Handle a left shift, restricted to bytes.
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function left(octet, shift)
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(octet << shift) & 0xff;
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advance();
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accumulate(left(val, 3));
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advance();
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accumulate(val >> 2);
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++rOffset;
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accumulate(left(val, 6));
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advance();
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accumulate(left(val, 1));
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advance();
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accumulate(val >> 4);
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++rOffset;
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accumulate(left(val, 4));
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advance();
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accumulate(val >> 1);
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++rOffset;
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accumulate(left(val, 7));
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advance();
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accumulate(left(val, 2));
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advance();
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accumulate(val >> 3);
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++rOffset;
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accumulate(left(val, 5));
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advance();
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accumulate(val);
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++rOffset;
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}
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// Our output. Define to be explicit (and maybe the compiler will be smart).
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let ret = new Array(bytes);
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let i = 0;
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let cOff = 0;
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let rOff = 0;
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for (; i < blocks; ++i) {
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try {
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processBlock(ret, cOff, rOff);
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} catch (ex) {
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// Handle the detection of padding.
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if (ex == "Done")
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break;
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throw ex;
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}
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cOff += 8;
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rOff += 5;
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}
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// Slice in case our shift overflowed to the right.
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return CommonUtils.byteArrayToString(ret.slice(0, bytes));
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},
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/**
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* Trim excess padding from a Base64 string and atob().
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*
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* See bug 562431 comment 4.
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*/
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safeAtoB: function safeAtoB(b64) {
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let len = b64.length;
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let over = len % 4;
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return over ? atob(b64.substr(0, len - over)) : atob(b64);
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},
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/**
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* Parses a JSON file from disk using OS.File and promises.
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*
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* @param path the file to read. Will be passed to `OS.File.read()`.
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* @return a promise that resolves to the JSON contents of the named file.
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*/
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readJSON: function(path) {
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return OS.File.read(path, { encoding: "utf-8" }).then((data) => {
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return JSON.parse(data);
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});
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},
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/**
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* Write a JSON object to the named file using OS.File and promises.
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*
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* @param contents a JS object. Will be serialized.
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* @param path the path of the file to write.
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* @return a promise, as produced by OS.File.writeAtomic.
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*/
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writeJSON: function(contents, path) {
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let encoder = new TextEncoder();
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let array = encoder.encode(JSON.stringify(contents));
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return OS.File.writeAtomic(path, array, {tmpPath: path + ".tmp"});
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},
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/**
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* Ensure that the specified value is defined in integer milliseconds since
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* UNIX epoch.
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*
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* This throws an error if the value is not an integer, is negative, or looks
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* like seconds, not milliseconds.
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*
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* If the value is null or 0, no exception is raised.
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*
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* @param value
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* Value to validate.
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*/
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ensureMillisecondsTimestamp: function ensureMillisecondsTimestamp(value) {
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if (!value) {
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return;
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}
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if (!/^[0-9]+$/.test(value)) {
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throw new Error("Timestamp value is not a positive integer: " + value);
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}
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let intValue = parseInt(value, 10);
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if (!intValue) {
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return;
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}
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// Catch what looks like seconds, not milliseconds.
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if (intValue < 10000000000) {
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throw new Error("Timestamp appears to be in seconds: " + intValue);
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}
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},
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/**
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* Read bytes from an nsIInputStream into a string.
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*
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* @param stream
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* (nsIInputStream) Stream to read from.
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* @param count
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* (number) Integer number of bytes to read. If not defined, or
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* 0, all available input is read.
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*/
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readBytesFromInputStream: function readBytesFromInputStream(stream, count) {
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let BinaryInputStream = Components.Constructor(
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"@mozilla.org/binaryinputstream;1",
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"nsIBinaryInputStream",
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"setInputStream");
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if (!count) {
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count = stream.available();
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}
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return new BinaryInputStream(stream).readBytes(count);
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},
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/**
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* Generate a new UUID using nsIUUIDGenerator.
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*
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* Example value: "1e00a2e2-1570-443e-bf5e-000354124234"
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*
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* @return string A hex-formatted UUID string.
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*/
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generateUUID: function generateUUID() {
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let uuid = Cc["@mozilla.org/uuid-generator;1"]
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.getService(Ci.nsIUUIDGenerator)
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.generateUUID()
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.toString();
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return uuid.substring(1, uuid.length - 1);
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},
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/**
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* Obtain an epoch value from a preference.
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*
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* This reads a string preference and returns an integer. The string
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* preference is expected to contain the integer milliseconds since epoch.
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* For best results, only read preferences that have been saved with
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* setDatePref().
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*
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* We need to store times as strings because integer preferences are only
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* 32 bits and likely overflow most dates.
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*
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* If the pref contains a non-integer value, the specified default value will
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* be returned.
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*
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* @param branch
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* (Preferences) Branch from which to retrieve preference.
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* @param pref
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* (string) The preference to read from.
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* @param def
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* (Number) The default value to use if the preference is not defined.
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* @param log
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* (Log.Logger) Logger to write warnings to.
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*/
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getEpochPref: function getEpochPref(branch, pref, def=0, log=null) {
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if (!Number.isInteger(def)) {
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throw new Error("Default value is not a number: " + def);
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}
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let valueStr = branch.get(pref, null);
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if (valueStr !== null) {
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let valueInt = parseInt(valueStr, 10);
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if (Number.isNaN(valueInt)) {
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if (log) {
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log.warn("Preference value is not an integer. Using default. " +
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pref + "=" + valueStr + " -> " + def);
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}
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return def;
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}
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return valueInt;
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}
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return def;
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},
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/**
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* Obtain a Date from a preference.
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*
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* This is a wrapper around getEpochPref. It converts the value to a Date
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* instance and performs simple range checking.
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*
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* The range checking ensures the date is newer than the oldestYear
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* parameter.
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*
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* @param branch
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* (Preferences) Branch from which to read preference.
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* @param pref
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* (string) The preference from which to read.
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* @param def
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* (Number) The default value (in milliseconds) if the preference is
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* not defined or invalid.
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* @param log
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* (Log.Logger) Logger to write warnings to.
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* @param oldestYear
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* (Number) Oldest year to accept in read values.
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*/
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getDatePref: function getDatePref(branch, pref, def=0, log=null,
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oldestYear=2010) {
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let valueInt = this.getEpochPref(branch, pref, def, log);
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let date = new Date(valueInt);
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if (valueInt == def || date.getFullYear() >= oldestYear) {
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return date;
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|
}
|
|
|
|
if (log) {
|
|
log.warn("Unexpected old date seen in pref. Returning default: " +
|
|
pref + "=" + date + " -> " + def);
|
|
}
|
|
|
|
return new Date(def);
|
|
},
|
|
|
|
/**
|
|
* Store a Date in a preference.
|
|
*
|
|
* This is the opposite of getDatePref(). The same notes apply.
|
|
*
|
|
* If the range check fails, an Error will be thrown instead of a default
|
|
* value silently being used.
|
|
*
|
|
* @param branch
|
|
* (Preference) Branch from which to read preference.
|
|
* @param pref
|
|
* (string) Name of preference to write to.
|
|
* @param date
|
|
* (Date) The value to save.
|
|
* @param oldestYear
|
|
* (Number) The oldest year to accept for values.
|
|
*/
|
|
setDatePref: function setDatePref(branch, pref, date, oldestYear=2010) {
|
|
if (date.getFullYear() < oldestYear) {
|
|
throw new Error("Trying to set " + pref + " to a very old time: " +
|
|
date + ". The current time is " + new Date() +
|
|
". Is the system clock wrong?");
|
|
}
|
|
|
|
branch.set(pref, "" + date.getTime());
|
|
},
|
|
|
|
/**
|
|
* Convert a string between two encodings.
|
|
*
|
|
* Output is only guaranteed if the input stream is composed of octets. If
|
|
* the input string has characters with values larger than 255, data loss
|
|
* will occur.
|
|
*
|
|
* The returned string is guaranteed to consist of character codes no greater
|
|
* than 255.
|
|
*
|
|
* @param s
|
|
* (string) The source string to convert.
|
|
* @param source
|
|
* (string) The current encoding of the string.
|
|
* @param dest
|
|
* (string) The target encoding of the string.
|
|
*
|
|
* @return string
|
|
*/
|
|
convertString: function convertString(s, source, dest) {
|
|
if (!s) {
|
|
throw new Error("Input string must be defined.");
|
|
}
|
|
|
|
let is = Cc["@mozilla.org/io/string-input-stream;1"]
|
|
.createInstance(Ci.nsIStringInputStream);
|
|
is.setData(s, s.length);
|
|
|
|
let listener = Cc["@mozilla.org/network/stream-loader;1"]
|
|
.createInstance(Ci.nsIStreamLoader);
|
|
|
|
let result;
|
|
|
|
listener.init({
|
|
onStreamComplete: function onStreamComplete(loader, context, status,
|
|
length, data) {
|
|
result = String.fromCharCode.apply(this, data);
|
|
},
|
|
});
|
|
|
|
let converter = this._converterService.asyncConvertData(source, dest,
|
|
listener, null);
|
|
converter.onStartRequest(null, null);
|
|
converter.onDataAvailable(null, null, is, 0, s.length);
|
|
converter.onStopRequest(null, null, null);
|
|
|
|
return result;
|
|
},
|
|
};
|
|
|
|
XPCOMUtils.defineLazyGetter(CommonUtils, "_utf8Converter", function() {
|
|
let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
|
|
.createInstance(Ci.nsIScriptableUnicodeConverter);
|
|
converter.charset = "UTF-8";
|
|
return converter;
|
|
});
|
|
|
|
XPCOMUtils.defineLazyGetter(CommonUtils, "_converterService", function() {
|
|
return Cc["@mozilla.org/streamConverters;1"]
|
|
.getService(Ci.nsIStreamConverterService);
|
|
});
|