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ExtensionPermissions.jsm
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ExtensionPermissions.jsm
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/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
/* 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/. */
"use strict";
ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetters(this, {
ExtensionParent: "resource://gre/modules/ExtensionParent.jsm",
JSONFile: "resource://gre/modules/JSONFile.jsm",
OS: "resource://gre/modules/osfile.jsm",
});
XPCOMUtils.defineLazyGetter(this, "StartupCache", () => ExtensionParent.StartupCache);
this.EXPORTED_SYMBOLS = ["ExtensionPermissions"];
const FILE_NAME = "extension-preferences.json";
let prefs;
let _initPromise;
async function _lazyInit() {
let path = OS.Path.join(OS.Constants.Path.profileDir, FILE_NAME);
prefs = new JSONFile({path});
prefs.data = {};
try {
let {buffer} = await OS.File.read(path);
prefs.data = JSON.parse(new TextDecoder().decode(buffer));
} catch (e) {
if (!e.becauseNoSuchFile) {
Cu.reportError(e);
}
}
}
function lazyInit() {
if (!_initPromise) {
_initPromise = _lazyInit();
}
return _initPromise;
}
function emptyPermissions() {
return {permissions: [], origins: []};
}
var ExtensionPermissions = {
async _saveSoon(extension) {
await lazyInit();
prefs.data[extension.id] = await this._getCached(extension);
return prefs.saveSoon();
},
async _get(extension) {
await lazyInit();
let perms = prefs.data[extension.id];
if (!perms) {
perms = emptyPermissions();
prefs.data[extension.id] = perms;
}
return perms;
},
async _getCached(extension) {
return StartupCache.permissions.get(extension.id,
() => this._get(extension));
},
get(extension) {
return this._getCached(extension);
},
// Add new permissions for the given extension. `permissions` is
// in the format that is passed to browser.permissions.request().
async add(extension, perms) {
let {permissions, origins} = await this._getCached(extension);
let added = emptyPermissions();
for (let perm of perms.permissions) {
if (!permissions.includes(perm)) {
added.permissions.push(perm);
permissions.push(perm);
}
}
for (let origin of perms.origins) {
origin = new MatchPattern(origin, {ignorePath: true}).pattern;
if (!origins.includes(origin)) {
added.origins.push(origin);
origins.push(origin);
}
}
if (added.permissions.length > 0 || added.origins.length > 0) {
this._saveSoon(extension);
extension.emit("add-permissions", added);
}
},
// Revoke permissions from the given extension. `permissions` is
// in the format that is passed to browser.permissions.remove().
async remove(extension, perms) {
let {permissions, origins} = await this._getCached(extension);
let removed = emptyPermissions();
for (let perm of perms.permissions) {
let i = permissions.indexOf(perm);
if (i >= 0) {
removed.permissions.push(perm);
permissions.splice(i, 1);
}
}
for (let origin of perms.origins) {
origin = new MatchPattern(origin, {ignorePath: true}).pattern;
let i = origins.indexOf(origin);
if (i >= 0) {
removed.origins.push(origin);
origins.splice(i, 1);
}
}
if (removed.permissions.length > 0 || removed.origins.length > 0) {
this._saveSoon(extension);
extension.emit("remove-permissions", removed);
}
},
async removeAll(extension) {
let perms = await this._getCached(extension);
if (perms.permissions.length || perms.origins.length) {
Object.assign(perms, emptyPermissions());
prefs.saveSoon();
}
},
// This is meant for tests only
async _uninit() {
if (!_initPromise) {
return;
}
await _initPromise;
await prefs.finalize();
prefs = null;
_initPromise = null;
},
};