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
|
/* 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/.*/
/*
* Manifest obtainer frame script implementation of:
* http://www.w3.org/TR/appmanifest/#obtaining
*
* It searches a top-level browsing context for
* a <link rel=manifest> element. Then fetches
* and processes the linked manifest.
*
* BUG: https://bugzilla.mozilla.org/show_bug.cgi?id=1083410
*/
/*globals Task, ManifestObtainer, ManifestFinder, content, sendAsyncMessage, addMessageListener, Components*/
"use strict";
const {
utils: Cu,
} = Components;
Cu.import("resource://gre/modules/ManifestObtainer.jsm");
Cu.import("resource://gre/modules/ManifestFinder.jsm");
Cu.import("resource://gre/modules/Task.jsm");
const MessageHandler = {
registerListeners() {
addMessageListener(
"DOM:WebManifest:hasManifestLink",
this.hasManifestLink.bind(this)
);
addMessageListener(
"DOM:ManifestObtainer:Obtain",
this.obtainManifest.bind(this)
);
addMessageListener(
"DOM:Manifest:FireAppInstalledEvent",
this.fireAppInstalledEvent.bind(this)
);
},
/**
* Check if the content document includes a link to a web manifest.
* @param {Object} aMsg The IPC message, which is destructured to just
* get the id.
*/
hasManifestLink({data: {id}}) {
const response = makeMsgResponse(id);
response.result = ManifestFinder.contentHasManifestLink(content);
response.success = true;
sendAsyncMessage("DOM:WebManifest:hasManifestLink", response);
},
/**
* Asynchronously obtains a web manifest from content by using the
* ManifestObtainer and messages back the result.
* @param {Object} aMsg The IPC message, which is destructured to just
* get the id.
*/
obtainManifest: Task.async(function* ({data: {id}}) {
const response = makeMsgResponse(id);
try {
response.result = yield ManifestObtainer.contentObtainManifest(content);
response.success = true;
} catch (err) {
response.result = serializeError(err);
}
sendAsyncMessage("DOM:ManifestObtainer:Obtain", response);
}),
fireAppInstalledEvent({data: {id}}){
const ev = new Event("appinstalled");
const response = makeMsgResponse(id);
if (!content || content.top !== content) {
const msg = "Can only dispatch install event on top-level browsing contexts.";
response.result = serializeError(new Error(msg));
} else {
response.success = true;
content.dispatchEvent(ev);
}
sendAsyncMessage("DOM:Manifest:FireAppInstalledEvent", response);
}
};
/**
* Utility function to Serializes an JS Error, so it can be transferred over
* the message channel.
* FIX ME: https://bugzilla.mozilla.org/show_bug.cgi?id=1172586
* @param {Error} aError The error to serialize.
* @return {Object} The serialized object.
*/
function serializeError(aError) {
const clone = {
"fileName": aError.fileName,
"lineNumber": aError.lineNumber,
"columnNumber": aError.columnNumber,
"stack": aError.stack,
"message": aError.message,
"name": aError.name
};
return clone;
}
function makeMsgResponse(aId) {
return {
id: aId,
success: false,
result: undefined
};
}
MessageHandler.registerListeners();
|
