summaryrefslogtreecommitdiffstats
path: root/toolkit/mozapps/extensions/amWebAPI.js
blob: 5ad0d23f1fb34f28e59afa16ba90c40fae1dbb10 (plain)
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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
/* 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 {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;

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

const MSG_PROMISE_REQUEST  = "WebAPIPromiseRequest";
const MSG_PROMISE_RESULT   = "WebAPIPromiseResult";
const MSG_INSTALL_EVENT    = "WebAPIInstallEvent";
const MSG_INSTALL_CLEANUP  = "WebAPICleanup";
const MSG_ADDON_EVENT_REQ  = "WebAPIAddonEventRequest";
const MSG_ADDON_EVENT      = "WebAPIAddonEvent";

class APIBroker {
  constructor(mm) {
    this.mm = mm;

    this._promises = new Map();

    // _installMap maps integer ids to DOM AddonInstall instances
    this._installMap = new Map();

    this.mm.addMessageListener(MSG_PROMISE_RESULT, this);
    this.mm.addMessageListener(MSG_INSTALL_EVENT, this);

    this._eventListener = null;
  }

  receiveMessage(message) {
    let payload = message.data;

    switch (message.name) {
      case MSG_PROMISE_RESULT: {
        if (!this._promises.has(payload.callbackID)) {
          return;
        }

        let resolve = this._promises.get(payload.callbackID);
        this._promises.delete(payload.callbackID);
        resolve(payload);
        break;
      }

      case MSG_INSTALL_EVENT: {
        let install = this._installMap.get(payload.id);
        if (!install) {
          let err = new Error(`Got install event for unknown install ${payload.id}`);
          Cu.reportError(err);
          return;
        }
        install._dispatch(payload);
        break;
      }

      case MSG_ADDON_EVENT: {
        if (this._eventListener) {
          this._eventListener(payload);
        }
      }
    }
  }

  sendRequest(type, ...args) {
    return new Promise(resolve => {
      let callbackID = APIBroker._nextID++;

      this._promises.set(callbackID, resolve);
      this.mm.sendAsyncMessage(MSG_PROMISE_REQUEST, { type, callbackID, args });
    });
  }

  setAddonListener(callback) {
    this._eventListener = callback;
    if (callback) {
      this.mm.addMessageListener(MSG_ADDON_EVENT, this);
      this.mm.sendAsyncMessage(MSG_ADDON_EVENT_REQ, {enabled: true});
    } else {
      this.mm.removeMessageListener(MSG_ADDON_EVENT, this);
      this.mm.sendAsyncMessage(MSG_ADDON_EVENT_REQ, {enabled: false});
    }
  }

  sendCleanup(ids) {
    this.setAddonListener(null);
    this.mm.sendAsyncMessage(MSG_INSTALL_CLEANUP, { ids });
  }
}

APIBroker._nextID = 0;

// Base class for building classes to back content-exposed interfaces.
class APIObject {
  init(window, broker, properties) {
    this.window = window;
    this.broker = broker;

    // Copy any provided properties onto this object, webidl bindings
    // will only expose to content what should be exposed.
    for (let key of Object.keys(properties)) {
      this[key] = properties[key];
    }
  }

  /**
   * Helper to implement an asychronous method visible to content, where
   * the method is implemented by sending a message to the parent process
   * and then wrapping the returned object or error in an appropriate object.
   * This helper method ensures that:
   *  - Returned Promise objects are from the content window
   *  - Rejected Promises have Error objects from the content window
   *  - Only non-internal errors are exposed to the caller
   *
   * @param {string} apiRequest The command to invoke in the parent process.
   * @param {array<cloneable>} apiArgs The arguments to include with the
   *                                   request to the parent process.
   * @param {function} resultConvert If provided, a function called with the
   *                                 result from the parent process as an
   *                                 argument.  Used to convert the result
   *                                 into something appropriate for content.
   * @returns {Promise<any>} A Promise suitable for passing directly to content.
   */
  _apiTask(apiRequest, apiArgs, resultConverter) {
    let win = this.window;
    let broker = this.broker;
    return new win.Promise((resolve, reject) => {
      Task.spawn(function*() {
        let result = yield broker.sendRequest(apiRequest, ...apiArgs);
        if ("reject" in result) {
          let err = new win.Error(result.reject.message);
          // We don't currently put any other properties onto Errors
          // generated by mozAddonManager.  If/when we do, they will
          // need to get copied here.
          reject(err);
          return;
        }

        let obj = result.resolve;
        if (resultConverter) {
          obj = resultConverter(obj);
        }
        resolve(obj);
      }).catch(err => {
        Cu.reportError(err);
        reject(new win.Error("Unexpected internal error"));
      });
    });
  }
}

class Addon extends APIObject {
  constructor(...args) {
    super();
    this.init(...args);
  }

  uninstall() {
    return this._apiTask("addonUninstall", [this.id]);
  }

  setEnabled(value) {
    return this._apiTask("addonSetEnabled", [this.id, value]);
  }
}

class AddonInstall extends APIObject {
  constructor(window, broker, properties) {
    super();
    this.init(window, broker, properties);

    broker._installMap.set(properties.id, this);
  }

  _dispatch(data) {
    // The message for the event includes updated copies of all install
    // properties.  Use the usual "let webidl filter visible properties" trick.
    for (let key of Object.keys(data)) {
      this[key] = data[key];
    }

    let event = new this.window.Event(data.event);
    this.__DOM_IMPL__.dispatchEvent(event);
  }

  install() {
    return this._apiTask("addonInstallDoInstall", [this.id]);
  }

  cancel() {
    return this._apiTask("addonInstallCancel", [this.id]);
  }
}

class WebAPI extends APIObject {
  constructor() {
    super();
    this.allInstalls = [];
    this.listenerCount = 0;
  }

  init(window) {
    let mm = window
        .QueryInterface(Ci.nsIInterfaceRequestor)
        .getInterface(Ci.nsIDocShell)
        .QueryInterface(Ci.nsIInterfaceRequestor)
        .getInterface(Ci.nsIContentFrameMessageManager);
    let broker = new APIBroker(mm);

    super.init(window, broker, {});

    window.addEventListener("unload", event => {
      this.broker.sendCleanup(this.allInstalls);
    });
  }

  getAddonByID(id) {
    return this._apiTask("getAddonByID", [id], addonInfo => {
      if (!addonInfo) {
        return null;
      }
      let addon = new Addon(this.window, this.broker, addonInfo);
      return this.window.Addon._create(this.window, addon);
    });
  }

  createInstall(options) {
    return this._apiTask("createInstall", [options], installInfo => {
      if (!installInfo) {
        return null;
      }
      let install = new AddonInstall(this.window, this.broker, installInfo);
      this.allInstalls.push(installInfo.id);
      return this.window.AddonInstall._create(this.window, install);
    });
  }

  eventListenerWasAdded(type) {
    if (this.listenerCount == 0) {
      this.broker.setAddonListener(data => {
        let event = new this.window.AddonEvent(data.event, data);
        this.__DOM_IMPL__.dispatchEvent(event);
      });
    }
    this.listenerCount++;
  }

  eventListenerWasRemoved(type) {
    this.listenerCount--;
    if (this.listenerCount == 0) {
      this.broker.setAddonListener(null);
    }
  }

  QueryInterface(iid) {
    if (iid.equals(WebAPI.classID) || iid.equals(Ci.nsISupports)
        || iid.equals(Ci.nsIDOMGlobalPropertyInitializer)) {
      return this;
    }
    return Cr.NS_ERROR_NO_INTERFACE;
  }
}

WebAPI.prototype.classID = Components.ID("{8866d8e3-4ea5-48b7-a891-13ba0ac15235}");
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([WebAPI]);