forked from mirrors/gecko-dev
61 lines
1.6 KiB
JavaScript
61 lines
1.6 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 THUMBNAIL_DIRECTORY = "thumbnails";
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const lazy = {};
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ChromeUtils.defineLazyGetter(lazy, "gCryptoHash", function () {
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return Cc["@mozilla.org/security/hash;1"].createInstance(Ci.nsICryptoHash);
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});
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ChromeUtils.defineLazyGetter(lazy, "textEncoder", function () {
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return new TextEncoder();
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});
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export function PageThumbsStorageService() {}
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PageThumbsStorageService.prototype = {
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classID: Components.ID("{97943eec-0e48-49ef-b7b7-cf4aa0109bb6}"),
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QueryInterface: ChromeUtils.generateQI(["nsIPageThumbsStorageService"]),
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// The path for the storage
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_path: null,
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get path() {
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if (!this._path) {
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this._path = PathUtils.join(
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PathUtils.localProfileDir,
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THUMBNAIL_DIRECTORY
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);
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}
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return this._path;
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},
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getLeafNameForURL(aURL) {
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if (typeof aURL != "string") {
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throw new TypeError("Expecting a string");
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}
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let hash = this._calculateMD5Hash(aURL);
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return hash + ".png";
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},
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getFilePathForURL(aURL) {
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return PathUtils.join(this.path, this.getLeafNameForURL(aURL));
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},
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_calculateMD5Hash(aValue) {
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let hash = lazy.gCryptoHash;
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let value = lazy.textEncoder.encode(aValue);
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hash.init(hash.MD5);
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hash.update(value, value.length);
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return this._convertToHexString(hash.finish(false));
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},
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_convertToHexString(aData) {
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let hex = "";
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for (let i = 0; i < aData.length; i++) {
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hex += ("0" + aData.charCodeAt(i).toString(16)).slice(-2);
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}
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return hex;
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},
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};
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