gecko/dom/permission/PermissionPromptHelper.jsm

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/* 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/. */
/* PermissionPromptHelper checks the permissionDB for a given permission
* name and performs prompting if needed.
* Usage: send PermissionPromptHelper:AskPermission via the FrameMessageManager with:
* |origin|, |appID|, |browserFlag| -> used for getting the principal and
* |type| and |access| to call testExactPermissionFromPrincipal.
* Note that |access| isn't currently used.
* Other arugments are:
* requestID: ID that gets returned with the result message.
*
* Once the permission is checked, it returns with the message
* "PermissionPromptHelper:AskPermission:OK"
* The result contains the |result| e.g.Ci.nsIPermissionManager.ALLOW_ACTION
* and a requestID that
*/
"use strict";
let DEBUG = 0;
if (DEBUG)
debug = function (s) { dump("-*- Permission Prompt Helper component: " + s + "\n"); }
else
debug = function (s) {}
const Cu = Components.utils;
const Cc = Components.classes;
const Ci = Components.interfaces;
let EXPORTED_SYMBOLS = ["PermissionPromptHelper"];
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyServiceGetter(this, "ppmm",
"@mozilla.org/parentprocessmessagemanager;1",
"nsIMessageListenerManager");
var permissionManager = Cc["@mozilla.org/permissionmanager;1"].getService(Ci.nsIPermissionManager);
var secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(Ci.nsIScriptSecurityManager);
var appsService = Cc["@mozilla.org/AppsService;1"].getService(Ci.nsIAppsService);
let PermissionPromptHelper = {
init: function() {
debug("Init");
ppmm.addMessageListener("PermissionPromptHelper:AskPermission", this);
Services.obs.addObserver(this, "profile-before-change", false);
},
askPermission: function(aMessage, aCallbacks) {
let msg = aMessage.json;
debug("askPerm: " + JSON.stringify(aMessage.json));
let uri = Services.io.newURI(msg.origin, null, null);
let principal = secMan.getAppCodebasePrincipal(uri, msg.appID, msg.browserFlag);
let perm = permissionManager.testExactPermissionFromPrincipal(principal, msg.type);
switch(perm) {
case Ci.nsIPermissionManager.ALLOW_ACTION:
aCallbacks.allow();
return;
case Ci.nsIPermissionManager.DENY_ACTION:
aCallbacks.cancel();
return;
}
// FIXXMEE PROMPT MAGIC! Bug 773114.
// We have to diplay the prompt here.
},
observe: function(aSubject, aTopic, aData) {
ppmm.removeMessageListener("PermissionPromptHelper:AskPermission", this);
Services.obs.removeObserver(this, "profile-before-change");
ppmm = null;
},
receiveMessage: function(aMessage) {
debug("PermissionPromptHelper::receiveMessage " + aMessage.name);
let mm = aMessage.target;
let msg = aMessage.data;
let result;
if (aMessage.name == "PermissionPromptHelper:AskPermission") {
this.askPermission(aMessage, {
cancel: function() {
mm.sendAsyncMessage("PermissionPromptHelper:AskPermission:OK", {result: Ci.nsIPermissionManager.DENY_ACTION, requestID: msg.requestID});
},
allow: function() {
mm.sendAsyncMessage("PermissionPromptHelper:AskPermission:OK", {result: Ci.nsIPermissionManager.ALLOW_ACTION, requestID: msg.requestID});
}
});
}
}
}
PermissionPromptHelper.init();