fixup! Bug 10760: Integrate TorButton to TorBrowser core

// Bug 1506 Android P1/TBB P5: This code provides users with notification

// in the event of external app launch. We want it to exist in the desktop

// port, but it is probably useless for Android.

/*************************************************************************

 * External App Handler.

 * Handles displaying confirmation dialogs for external apps and protocols

 * due to Firefox Bug https://bugzilla.mozilla.org/show_bug.cgi?id=440892

 *

 * An instance of this module is created each time the browser starts to

 * download a file and when an external application may be invoked to

 * handle an URL (e.g., when the user clicks on a mailto: URL).

 *************************************************************************/

const { XPCOMUtils } = ChromeUtils.import(

  "resource://gre/modules/XPCOMUtils.jsm"

);

const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");

const { PromptUtils } = ChromeUtils.import(

  "resource://gre/modules/SharedPromptUtils.jsm"

);

XPCOMUtils.defineLazyModuleGetters(this, {

  ComponentUtils: "resource://gre/modules/ComponentUtils.jsm",

});

let { torbutton_get_property_string } = ChromeUtils.import(

  "resource://torbutton/modules/utils.js"

);

// Module specific constants

const kMODULE_NAME = "Torbutton External App Handler";

const kCONTRACT_ID = "@torproject.org/torbutton-extAppBlocker;1";

const kMODULE_CID = Components.ID("3da0269f-fc29-4e9e-a678-c3b1cafcf13f");

const kInterfaces = [Ci.nsIObserver, Ci.nsIClassInfo];

function ExternalAppBlocker() {

  this.logger = Cc["@torproject.org/torbutton-logger;1"].getService(

    Ci.nsISupports

  ).wrappedJSObject;

  this.logger.log(3, "Component Load 0: New ExternalAppBlocker.");

}

ExternalAppBlocker.prototype = {

  _helperAppLauncher: undefined,

  QueryInterface: ChromeUtils.generateQI([

    Ci.nsIObserver,

    Ci.nsIHelperAppWarningDialog,

  ]),

  // make this an nsIClassInfo object

  flags: Ci.nsIClassInfo.DOM_OBJECT,

  classDescription: kMODULE_NAME,

  contractID: kCONTRACT_ID,

  classID: kMODULE_CID,

  // method of nsIClassInfo

  getInterfaces(count) {

    count.value = kInterfaces.length;

    return kInterfaces;

  },

  // method of nsIClassInfo

  getHelperForLanguage(count) {

    return null;

  },

  // method of nsIHelperAppWarningDialog

  maybeShow(aLauncher, aWindowContext) {

    // Hold a reference to the object that called this component. This is

    // important not just because we need to later invoke the

    // continueRequest() or cancelRequest() callback on aLauncher, but also

    // so that the launcher object (which is a reference counted object) is

    // not released too soon.

    this._helperAppLauncher = aLauncher;

    if (!Services.prefs.getBoolPref("extensions.torbutton.launch_warning")) {

      this._helperAppLauncher.continueRequest();

      return;

    }

    this._showPrompt(aWindowContext);

  },

  /*

   * The _showPrompt() implementation uses some XUL and JS that is part of the

   * browser's confirmEx() implementation. Specifically, _showPrompt() depends

   * on chrome://global/content/commonDialog.xhtml as well as some of the code

   * in resource://gre/modules/SharedPromptUtils.jsm.

   */

  _showPrompt(aWindowContext) {

    let parentWin;

    try {

      parentWin = aWindowContext.getInterface(Ci.nsIDOMWindow);

    } catch (e) {

      parentWin = Services.wm.getMostRecentWindow("navigator:browser");

    }

    let title = torbutton_get_property_string("torbutton.popup.external.title");

    let app = torbutton_get_property_string("torbutton.popup.external.app");

    let note = torbutton_get_property_string("torbutton.popup.external.note");

    let suggest = torbutton_get_property_string(

      "torbutton.popup.external.suggest"

    );

    let launch = torbutton_get_property_string("torbutton.popup.launch");

    let cancel = torbutton_get_property_string("torbutton.popup.cancel");

    let dontask = torbutton_get_property_string("torbutton.popup.dontask");

    let args = {

      promptType: "confirmEx",

      title,

      text: app + note + suggest + " ",

      checkLabel: dontask,

      checked: false,

      ok: false,

      button0Label: launch,

      button1Label: cancel,

      defaultButtonNum: 1, // Cancel

      buttonNumClicked: 1, // Cancel

      enableDelay: true,

    };

    let propBag = PromptUtils.objectToPropBag(args);

    let uri = "chrome://global/content/commonDialog.xhtml";

    let promptWin = Services.ww.openWindow(

      parentWin,

      uri,

      "_blank",

      "centerscreen,chrome,titlebar",

      propBag

    );

    promptWin.addEventListener("load", aEvent => {

      promptWin.addEventListener("unload", aEvent => {

        PromptUtils.propBagToObject(propBag, args);

        if (0 == args.buttonNumClicked) {

          // Save the checkbox value and tell the browser's external helper app

          // module about the user's choice.

          if (args.checked) {

            Services.prefs.setBoolPref(

              "extensions.torbutton.launch_warning",

              false

            );

          }

          this._helperAppLauncher.continueRequest();

        } else {

          this._helperAppLauncher.cancelRequest(Cr.NS_BINDING_ABORTED);

        }

      });

    });

  },

};

// Assign factory to global object.

const NSGetFactory = XPCOMUtils.generateNSGetFactory

  ? XPCOMUtils.generateNSGetFactory([ExternalAppBlocker])

  : ComponentUtils.generateNSGetFactory([ExternalAppBlocker]);

% component {f605ec27-d867-44b5-ad97-2a29276642c3} %components/dragDropFilter.js

% contract @torproject.org/torbutton-dragDropFilter;1 {f605ec27-d867-44b5-ad97-2a29276642c3}

% component {3da0269f-fc29-4e9e-a678-c3b1cafcf13f} %components/external-app-blocker.js

% contract @torproject.org/torbutton-extAppBlocker;1 {3da0269f-fc29-4e9e-a678-c3b1cafcf13f}

% component {06322def-6fde-4c06-aef6-47ae8e799629} %components/startup-observer.js

% contract @torproject.org/startup-observer;1 {06322def-6fde-4c06-aef6-47ae8e799629}