/* 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";

const XPI_CONTENT_TYPE = "application/x-xpinstall";

const MSG_INSTALL_ADDON = "WebInstallerInstallAddonFromWebpage";

ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");

ChromeUtils.import("resource://gre/modules/Services.jsm");

function amContentHandler() {

}

amContentHandler.prototype = {

  /**

   * Handles a new request for an application/x-xpinstall file.

   *

   * @param  aMimetype

   *         The mimetype of the file

   * @param  aContext

   *         The context passed to nsIChannel.asyncOpen

   * @param  aRequest

   *         The nsIRequest dealing with the content

   */

  handleContent(aMimetype, aContext, aRequest) {

    if (aMimetype != XPI_CONTENT_TYPE)

      throw Cr.NS_ERROR_WONT_HANDLE_CONTENT;

    if (!(aRequest instanceof Ci.nsIChannel))

      throw Cr.NS_ERROR_WONT_HANDLE_CONTENT;

    let uri = aRequest.URI;

    let window = null;

    let callbacks = aRequest.notificationCallbacks ?

                    aRequest.notificationCallbacks :

                    aRequest.loadGroup.notificationCallbacks;

    if (callbacks)

      window = callbacks.getInterface(Ci.nsIDOMWindow);

    aRequest.cancel(Cr.NS_BINDING_ABORTED);

    let install = {

      uri: uri.spec,

      hash: null,

      name: null,

      icon: null,

      mimetype: XPI_CONTENT_TYPE,

      triggeringPrincipal: aRequest.loadInfo.triggeringPrincipal,

      callbackID: -1

    };

    if (Services.appinfo.processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT) {

      // When running in the main process this might be a frame inside an

      // in-content UI page, walk up to find the first frame element in a chrome

      // privileged document

      let element = window.frameElement;

      let ssm = Services.scriptSecurityManager;

      while (element && !ssm.isSystemPrincipal(element.ownerDocument.nodePrincipal))

        element = element.ownerGlobal.frameElement;

      if (element) {

        let listener = Cc["@mozilla.org/addons/integration;1"].

                       getService(Ci.nsIMessageListener);

        listener.wrappedJSObject.receiveMessage({

          name: MSG_INSTALL_ADDON,

          target: element,

          data: install

        });

        return;

      }

    }

    // Fall back to sending through the message manager

    let messageManager = window.QueryInterface(Ci.nsIInterfaceRequestor)

                               .getInterface(Ci.nsIDocShell)

                               .QueryInterface(Ci.nsIInterfaceRequestor)

                               .getInterface(Ci.nsIContentFrameMessageManager);

    messageManager.sendAsyncMessage(MSG_INSTALL_ADDON, install);

  },

  classID: Components.ID("{7beb3ba8-6ec3-41b4-b67c-da89b8518922}"),

  QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentHandler]),

  log(aMsg) {

    let msg = "amContentHandler.js: " + (aMsg.join ? aMsg.join("") : aMsg);

    Services.console.logStringMessage(msg);

    dump(msg + "\n");

  }

};

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