gecko-dev/dom/permission/PermissionPromptHelper.jsm

147 lines
5.4 KiB
JavaScript

/* 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;
let debug;
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;
this.EXPORTED_SYMBOLS = ["PermissionPromptHelper"];
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/PermissionsInstaller.jsm");
Cu.import("resource://gre/modules/PermissionsTable.jsm");
XPCOMUtils.defineLazyServiceGetter(this, "ppmm",
"@mozilla.org/parentprocessmessagemanager;1",
"nsIMessageListenerManager");
XPCOMUtils.defineLazyServiceGetter(this, "permissionPromptService",
"@mozilla.org/permission-prompt-service;1",
"nsIPermissionPromptService");
let permissionManager = Cc["@mozilla.org/permissionmanager;1"].getService(Ci.nsIPermissionManager);
let secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(Ci.nsIScriptSecurityManager);
let appsService = Cc["@mozilla.org/AppsService;1"].getService(Ci.nsIAppsService);
this.PermissionPromptHelper = {
init: function init() {
debug("Init");
ppmm.addMessageListener("PermissionPromptHelper:AskPermission", this);
Services.obs.addObserver(this, "profile-before-change", false);
},
askPermission: function askPermission(aMessage, aCallbacks) {
let msg = aMessage.json;
let access;
if (PermissionsTable[msg.type].access) {
access = "readwrite"; // XXXddahl: Not sure if this should be set to READWRITE
}
// Expand permission names.
let expandedPermNames = expandPermissions(msg.type, access);
let installedPermValues = [];
let uri = Services.io.newURI(msg.origin, null, null);
let principal =
secMan.getAppCodebasePrincipal(uri, msg.appID, msg.browserFlag);
for (let idx in expandedPermNames) {
let access = msg.access ? expandedPermNames[idx] : msg.type;
let permValue =
permissionManager.testExactPermissionFromPrincipal(principal, access);
installedPermValues.push(permValue);
}
// TODO: see bug 804623, We are preventing "read" operations
// even if just "write" has been set to DENY_ACTION
for (let idx in installedPermValues) {
// if any of the installedPermValues are deny, run aCallbacks.cancel
if (installedPermValues[idx] == Ci.nsIPermissionManager.DENY_ACTION ||
installedPermValues[idx] == Ci.nsIPermissionManager.UNKNOWN_ACTION) {
aCallbacks.cancel();
return;
}
}
for (let idx in installedPermValues) {
if (installedPermValues[idx] == Ci.nsIPermissionManager.PROMPT_ACTION) {
// create a nsIContentPermissionRequest
let request = {
type: msg.type,
access: msg.access ? msg.access : "unused",
principal: principal,
QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentPermissionRequest]),
allow: aCallbacks.allow,
cancel: aCallbacks.cancel,
window: Services.wm.getMostRecentWindow("navigator:browser")
};
permissionPromptService.getPermission(request);
return;
}
}
for (let idx in installedPermValues) {
if (installedPermValues[idx] == Ci.nsIPermissionManager.ALLOW_ACTION) {
aCallbacks.allow();
return;
}
}
},
observe: function observe(aSubject, aTopic, aData) {
ppmm.removeMessageListener("PermissionPromptHelper:AskPermission", this);
Services.obs.removeObserver(this, "profile-before-change");
ppmm = null;
},
receiveMessage: function receiveMessage(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();