DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (b6d82b1a6b02)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238
/* 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 { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
const { Preferences } = ChromeUtils.import(
  "resource://gre/modules/Preferences.jsm"
);
const { Log } = ChromeUtils.import("resource://gre/modules/Log.jsm");

const XPINSTALL_MIMETYPE = "application/x-xpinstall";

const MSG_INSTALL_ENABLED = "WebInstallerIsInstallEnabled";
const MSG_INSTALL_ADDON = "WebInstallerInstallAddonFromWebpage";
const MSG_INSTALL_CALLBACK = "WebInstallerInstallCallback";

var log = Log.repository.getLogger("AddonManager.InstallTrigger");
log.level =
  Log.Level[
    Preferences.get("extensions.logging.enabled", false) ? "Warn" : "Trace"
  ];

function CallbackObject(id, callback, mediator) {
  this.id = id;
  this.callback = callback;
  this.callCallback = function(url, status) {
    try {
      this.callback(url, status);
    } catch (e) {
      log.warn("InstallTrigger callback threw an exception: " + e);
    }

    mediator._callbacks.delete(id);
  };
}

function RemoteMediator(window) {
  let utils = window.windowUtils;
  this._windowID = utils.currentInnerWindowID;

  this.mm = window.docShell.messageManager;
  this.mm.addWeakMessageListener(MSG_INSTALL_CALLBACK, this);

  this._lastCallbackID = 0;
  this._callbacks = new Map();
}

RemoteMediator.prototype = {
  receiveMessage(message) {
    if (message.name == MSG_INSTALL_CALLBACK) {
      let payload = message.data;
      let callbackHandler = this._callbacks.get(payload.callbackID);
      if (callbackHandler) {
        callbackHandler.callCallback(payload.url, payload.status);
      }
    }
  },

  enabled(url) {
    let params = {
      mimetype: XPINSTALL_MIMETYPE,
    };
    return this.mm.sendSyncMessage(MSG_INSTALL_ENABLED, params)[0];
  },

  install(install, principal, callback, window) {
    let callbackID = this._addCallback(callback);

    install.mimetype = XPINSTALL_MIMETYPE;
    install.triggeringPrincipal = principal;
    install.callbackID = callbackID;

    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;
      while (
        element &&
        !element.ownerDocument.nodePrincipal.isSystemPrincipal
      ) {
        element = element.ownerGlobal.frameElement;
      }

      if (element) {
        let listener = Cc["@mozilla.org/addons/integration;1"].getService();
        return listener.wrappedJSObject.receiveMessage({
          name: MSG_INSTALL_ADDON,
          target: element,
          data: install,
        });
      }
    }

    // Fall back to sending through the message manager
    let messageManager = window.docShell.messageManager;

    return messageManager.sendSyncMessage(MSG_INSTALL_ADDON, install)[0];
  },

  _addCallback(callback) {
    if (!callback || typeof callback != "function") {
      return -1;
    }

    let callbackID = this._windowID + "-" + ++this._lastCallbackID;
    let callbackObject = new CallbackObject(callbackID, callback, this);
    this._callbacks.set(callbackID, callbackObject);
    return callbackID;
  },

  QueryInterface: ChromeUtils.generateQI([Ci.nsISupportsWeakReference]),
};

function InstallTrigger() {}

InstallTrigger.prototype = {
  // We've declared ourselves as providing the nsIDOMGlobalPropertyInitializer
  // interface.  This means that when the InstallTrigger property is gotten from
  // the window that will createInstance this object and then call init(),
  // passing the window were bound to.  It will then automatically create the
  // WebIDL wrapper (InstallTriggerImpl) for this object.  This indirection is
  // necessary because webidl does not (yet) support statics (bug 863952). See
  // bug 926712 and then bug 1442360 for more details about this implementation.
  init(window) {
    this._window = window;
    this._principal = window.document.nodePrincipal;
    this._url = window.document.documentURIObject;

    this._mediator = new RemoteMediator(window);
    // If we can't set up IPC (e.g., because this is a top-level window or
    // something), then don't expose InstallTrigger.  The Window code handles
    // that, if we throw an exception here.
  },

  enabled() {
    return this._mediator.enabled(this._url.spec);
  },

  updateEnabled() {
    return this.enabled();
  },

  install(installs, callback) {
    let keys = Object.keys(installs);
    if (keys.length > 1) {
      throw new this._window.Error("Only one XPI may be installed at a time");
    }

    let item = installs[keys[0]];

    if (typeof item === "string") {
      item = { URL: item };
    }
    if (!item.URL) {
      throw new this._window.Error(
        "Missing URL property for '" + keys[0] + "'"
      );
    }

    let url = this._resolveURL(item.URL);
    if (!this._checkLoadURIFromScript(url)) {
      throw new this._window.Error(
        "Insufficient permissions to install: " + url.spec
      );
    }

    let iconUrl = null;
    if (item.IconURL) {
      iconUrl = this._resolveURL(item.IconURL);
      if (!this._checkLoadURIFromScript(iconUrl)) {
        iconUrl = null; // If page can't load the icon, just ignore it
      }
    }

    let sourceHost;

    try {
      sourceHost = this._principal.URI.host;
    } catch (err) {
      // Ignore errors when retrieving the host for the principal (e.g. null principals raise
      // an NS_ERROR_FAILURE when principal.URI.host is accessed).
    }

    let installData = {
      uri: url.spec,
      hash: item.Hash || null,
      name: item.name,
      icon: iconUrl ? iconUrl.spec : null,
      method: "installTrigger",
      sourceHost,
    };

    return this._mediator.install(
      installData,
      this._principal,
      callback,
      this._window
    );
  },

  startSoftwareUpdate(url, flags) {
    let filename = Services.io.newURI(url).QueryInterface(Ci.nsIURL).filename;
    let args = {};
    args[filename] = { URL: url };
    return this.install(args);
  },

  installChrome(type, url, skin) {
    return this.startSoftwareUpdate(url);
  },

  _resolveURL(url) {
    return Services.io.newURI(url, null, this._url);
  },

  _checkLoadURIFromScript(uri) {
    let secman = Services.scriptSecurityManager;
    try {
      secman.checkLoadURIWithPrincipal(
        this._principal,
        uri,
        secman.DISALLOW_INHERIT_PRINCIPAL
      );
      return true;
    } catch (e) {
      return false;
    }
  },

  classID: Components.ID("{9df8ef2b-94da-45c9-ab9f-132eb55fddf1}"),
  contractID: "@mozilla.org/addons/installtrigger;1",
  QueryInterface: ChromeUtils.generateQI([Ci.nsIDOMGlobalPropertyInitializer]),
};

var EXPORTED_SYMBOLS = ["InstallTrigger"];