200d1fb235
Add permission-based reading of Android contacts, SMS and call history. Include shared Gaia fixes and document device validation limits. Pixel image qualification remains pending.
105 lines
3 KiB
JavaScript
Executable file
105 lines
3 KiB
JavaScript
Executable file
'use strict';
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(function(exports) {
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var LayoutDictionaryDownloader = function(imEngineId, dictFilename) {
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this.imEngineId = imEngineId;
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this.dictFilename = dictFilename;
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this._xhr = null;
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};
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// Dictionaries ship with Vulpes so adding a layout also works offline.
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LayoutDictionaryDownloader.prototype.REMOTE_URL =
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'/js/imes/%imEngineId/dictionaries/%dictFilename';
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// If the data schema changes in an incompatible way, we must bump the
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// version-to-download here.
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LayoutDictionaryDownloader.prototype.ENGINE_DATA_VERSIONS = Object.freeze({
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'latin': 1
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});
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LayoutDictionaryDownloader.prototype.onprogress = null;
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LayoutDictionaryDownloader.prototype.load = function() {
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if (this._xhr) {
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throw new Error('LayoutDictionaryDownloader: Already downloading...');
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}
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var p = new Promise(function(resolve, reject) {
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var url = this.REMOTE_URL
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.replace('%imEngineId', this.imEngineId)
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.replace('%ver', this.ENGINE_DATA_VERSIONS[this.imEngineId])
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.replace('%dictFilename', this.dictFilename);
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var xhr = this._xhr = new XMLHttpRequest();
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xhr.open('GET', url, true);
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xhr.responseType = 'arraybuffer';
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xhr.onprogress = function(evt) {
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if (typeof this.onprogress === 'function') {
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this.onprogress(evt.loaded, evt.total);
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}
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}.bind(this);
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xhr.onloadend = function() {
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this._xhr = null;
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var data = xhr.response;
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// We will only resolve the promise when the data is verified.
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// For any other situration, we simply return the HTTP status code as
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// a rejected placeholder value.
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// (it doesn't really matter if you got 200/404/500
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// or anything if it's not what you are looking for right :-/?)
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if (data && this._verifyData(data)) {
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if (typeof this.onprogress === 'function') {
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this.onprogress(data.byteLength, data.byteLength);
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}
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resolve(data);
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} else {
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reject(xhr.statusText);
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}
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}.bind(this);
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xhr.send();
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}.bind(this));
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return p;
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};
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LayoutDictionaryDownloader.prototype.abort = function() {
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if (!this._xhr) {
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throw new Error('LayoutDictionaryDownloader: ' +
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'Not downloading but abort is called.');
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}
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this._xhr.abort();
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this._xhr = null;
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};
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LayoutDictionaryDownloader.prototype._verifyData = function(buffer) {
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switch (this.imEngineId) {
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case 'latin':
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// There is only first 8 bytes to check -- we can't be sure if the data
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// is truncated. However that shouldn't happen since our CDN sends out
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// Content-Length header.
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//
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// TODO: Harden the verification here in some way.
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//
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if (!(buffer instanceof ArrayBuffer) || buffer.byteLength < 8) {
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return false;
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}
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var view = new Uint8Array(buffer, 0, 8);
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return (String.fromCharCode.apply(String, view) === 'FxOSDICT');
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default:
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throw new Error('LayoutDictionaryDownloader: ' +
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'No verify method available for this imEngine.');
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}
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};
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exports.LayoutDictionaryDownloader = LayoutDictionaryDownloader;
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}(window));
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