/* 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";

/* static functions */
let DEBUG = 0;
let debug;
if (DEBUG) {
  debug = function (s) { dump("-*- PermissionPromptService: " + s + "\n"); };
}
else {
  debug = function (s) {};
}

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/PermissionsInstaller.jsm");

const PERMISSIONPROMPTSERVICE_CONTRACTID = "@mozilla.org/permission-prompt-service;1";
const PERMISSIONPROMPTSERVICE_CID = Components.ID("{e5f953b3-a6ca-444e-a88d-cdc81383741c}");
const permissionPromptService = Ci.nsIPermissionPromptService;

XPCOMUtils.defineLazyServiceGetter(this,
                                   "PermSettings",
                                   "@mozilla.org/permissionSettings;1",
                                   "nsIDOMPermissionSettings");

var permissionManager = Cc["@mozilla.org/permissionmanager;1"].getService(Ci.nsIPermissionManager);
var secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(Ci.nsIScriptSecurityManager);

function makePrompt()
{
  return Cc["@mozilla.org/content-permission/prompt;1"].createInstance(Ci.nsIContentPermissionPrompt);
}

function PermissionPromptService()
{
  debug("Constructor");
}

PermissionPromptService.prototype = {

  classID : PERMISSIONPROMPTSERVICE_CID,

  QueryInterface : XPCOMUtils.generateQI([permissionPromptService, Ci.nsIObserver]),

  classInfo : XPCOMUtils.generateCI({classID: PERMISSIONPROMPTSERVICE_CID,
                                     contractID: PERMISSIONPROMPTSERVICE_CONTRACTID,
                                     classDescription: "PermissionPromptService",
                                     interfaces: [permissionPromptService]
                                     }),
  /**
   * getPermission
   *   Ask for permission for an API, device, etc.
   * @param nsIContentPermissionRequest aRequest
   * @returns void
   **/
  getPermission: function PS_getPermission(aRequest)
  {
    if (!(aRequest instanceof Ci.nsIContentPermissionRequest)) {
      throw new Error("PermissionService.getPermission: "
                      + "2nd argument must be type 'nsIContentPermissionRequest'");
    }

    // Only allow exactly one permission request here.
    let types = aRequest.types.QueryInterface(Ci.nsIArray);
    if (types.length != 1) {
      aRequest.cancel();
      return;
    }
    let reqType = types.queryElementAt(0, Ci.nsIContentPermissionType);

    let type = reqType.access !== "unused" ? reqType.type + "-" + reqType.access
                                           : reqType.type;
    let perm =
      permissionManager.testExactPermissionFromPrincipal(aRequest.principal, type);

    switch (perm) {
      case Ci.nsIPermissionManager.ALLOW_ACTION:
        aRequest.allow();
        break;
      case Ci.nsIPermissionManager.PROMPT_ACTION:
        makePrompt().prompt(aRequest);
        break;
      case Ci.nsIPermissionManager.DENY_ACTION:
      case Ci.nsIPermissionManager.UNKNOWN_ACTION:
    default:
      aRequest.cancel();
      break;
    }
  },
};

this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PermissionPromptService]);