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
|
const fs = require('fs')
const path = require('path')
const pump = require('pump')
const LocalMessageDuplexStream = require('post-message-stream')
const PongStream = require('ping-pong-stream/pong')
const ObjectMultiplex = require('obj-multiplex')
const extension = require('extensionizer')
const PortStream = require('./lib/port-stream.js')
const inpageContent = fs.readFileSync(path.join(__dirname, '..', '..', 'dist', 'chrome', 'inpage.js')).toString()
const inpageSuffix = '//# sourceURL=' + extension.extension.getURL('inpage.js') + '\n'
const inpageBundle = inpageContent + inpageSuffix
// Eventually this streaming injection could be replaced with:
// https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Language_Bindings/Components.utils.exportFunction
//
// But for now that is only Firefox
// If we create a FireFox-only code path using that API,
// MetaMask will be much faster loading and performant on Firefox.
if (shouldInjectWeb3()) {
setupInjection()
setupStreams()
}
/**
* Creates a script tag that injects inpage.js
*/
function setupInjection () {
try {
// inject in-page script
var scriptTag = document.createElement('script')
scriptTag.textContent = inpageBundle
scriptTag.onload = function () { this.parentNode.removeChild(this) }
var container = document.head || document.documentElement
// append as first child
container.insertBefore(scriptTag, container.children[0])
} catch (e) {
console.error('Metamask injection failed.', e)
}
}
/**
* Sets up two-way communication streams between the
* browser extension and local per-page browser context
*/
function setupStreams () {
// setup communication to page and plugin
const pageStream = new LocalMessageDuplexStream({
name: 'contentscript',
target: 'inpage',
})
const pluginPort = extension.runtime.connect({ name: 'contentscript' })
const pluginStream = new PortStream(pluginPort)
// forward communication plugin->inpage
pump(
pageStream,
pluginStream,
pageStream,
(err) => logStreamDisconnectWarning('MetaMask Contentscript Forwarding', err)
)
// setup local multistream channels
const mux = new ObjectMultiplex()
mux.setMaxListeners(25)
pump(
mux,
pageStream,
mux,
(err) => logStreamDisconnectWarning('MetaMask Inpage', err)
)
pump(
mux,
pluginStream,
mux,
(err) => logStreamDisconnectWarning('MetaMask Background', err)
)
// connect ping stream
const pongStream = new PongStream({ objectMode: true })
pump(
mux,
pongStream,
mux,
(err) => logStreamDisconnectWarning('MetaMask PingPongStream', err)
)
// connect phishing warning stream
const phishingStream = mux.createStream('phishing')
phishingStream.once('data', redirectToPhishingWarning)
// ignore unused channels (handled by background, inpage)
mux.ignoreStream('provider')
mux.ignoreStream('publicConfig')
}
/**
* Error handler for page to plugin stream disconnections
*
* @param {string} remoteLabel Remote stream name
* @param {Error} err Stream connection error
*/
function logStreamDisconnectWarning (remoteLabel, err) {
let warningMsg = `MetamaskContentscript - lost connection to ${remoteLabel}`
if (err) warningMsg += '\n' + err.stack
console.warn(warningMsg)
}
/**
* Determines if Web3 should be injected
*
* @returns {boolean} {@code true} if Web3 should be injected
*/
function shouldInjectWeb3 () {
return doctypeCheck() && suffixCheck()
&& documentElementCheck() && !blacklistedDomainCheck()
}
/**
* Checks the doctype of the current document if it exists
*
* @returns {boolean} {@code true} if the doctype is html or if none exists
*/
function doctypeCheck () {
const doctype = window.document.doctype
if (doctype) {
return doctype.name === 'html'
} else {
return true
}
}
/**
* Checks the current document extension
*
* @returns {boolean} {@code true} if the current extension is not prohibited
*/
function suffixCheck () {
var prohibitedTypes = ['xml', 'pdf']
var currentUrl = window.location.href
var currentRegex
for (let i = 0; i < prohibitedTypes.length; i++) {
currentRegex = new RegExp(`\\.${prohibitedTypes[i]}$`)
if (currentRegex.test(currentUrl)) {
return false
}
}
return true
}
/**
* Checks the documentElement of the current document
*
* @returns {boolean} {@code true} if the documentElement is an html node or if none exists
*/
function documentElementCheck () {
var documentElement = document.documentElement.nodeName
if (documentElement) {
return documentElement.toLowerCase() === 'html'
}
return true
}
/**
* Checks if the current domain is blacklisted
*
* @returns {boolean} {@code true} if the current domain is blacklisted
*/
function blacklistedDomainCheck () {
var blacklistedDomains = [
'uscourts.gov',
'dropbox.com',
'webbyawards.com',
'cdn.shopify.com/s/javascripts/tricorder/xtld-read-only-frame.html',
]
var currentUrl = window.location.href
var currentRegex
for (let i = 0; i < blacklistedDomains.length; i++) {
const blacklistedDomain = blacklistedDomains[i].replace('.', '\\.')
currentRegex = new RegExp(`(?:https?:\\/\\/)(?:(?!${blacklistedDomain}).)*$`)
if (!currentRegex.test(currentUrl)) {
return true
}
}
return false
}
/**
* Redirects the current page to a phishing information page
*/
function redirectToPhishingWarning () {
console.log('MetaMask - redirecting to phishing warning')
window.location.href = 'https://metamask.io/phishing.html'
}
|
