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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="dropdown icon"></i><a href="ComposableObservableStore.html">ComposableObservableStore</a></div></div></div><div class="content"><ul class='methods'><li data-type='method'><a href="ComposableObservableStore.html#getFlatState">getFlatState</a></li><li data-type='method'><a href="ComposableObservableStore.html#updateStructure">updateStructure</a></li></ul></div></li></div><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="dropdown icon"></i><a href="EdgeEncryptor.html">EdgeEncryptor</a></div></div></div><div class="content"><ul class='methods'><li data-type='method'><a href="EdgeEncryptor.html#decrypt">decrypt</a></li><li data-type='method'><a href="EdgeEncryptor.html#encrypt">encrypt</a></li></ul></div></li></div><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="dropdown icon"></i><a href="TokenRatesController.html">TokenRatesController</a></div></div></div><div class="content"><ul class='methods'><li data-type='method'><a href="TokenRatesController.html#fetchExchangeRate">fetchExchangeRate</a></li><li data-type='method'><a href="TokenRatesController.html#updateExchangeRates">updateExchangeRates</a></li></ul></div></li></div><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="inverted dropdown icon"></i><a href="module.exports_module.exports.html">exports</a></div></div></div></li></div></ul><h3>Global</h3><ul><li><a href="global.html#blacklistedDomainCheck">blacklistedDomainCheck</a></li><li><a href="global.html#cleanContextForImports">cleanContextForImports</a></li><li><a href="global.html#config">config</a></li><li><a href="global.html#connectToAccountManager">connectToAccountManager</a></li><li><a href="global.html#doctypeCheck">doctypeCheck</a></li><li><a href="global.html#documentElementCheck">documentElementCheck</a></li><li><a href="global.html#initializePopup">initializePopup</a></li><li><a href="global.html#initialState">initialState</a></li><li><a href="global.html#logStreamDisconnectWarning">logStreamDisconnectWarning</a></li><li><a href="global.html#redirectToPhishingWarning">redirectToPhishingWarning</a></li><li><a href="global.html#restoreContextAfterImports">restoreContextAfterImports</a></li><li><a href="global.html#setupControllerConnection">setupControllerConnection</a></li><li><a href="global.html#setupInjection">setupInjection</a></li><li><a href="global.html#setupStreams">setupStreams</a></li><li><a href="global.html#setupWeb3Connection">setupWeb3Connection</a></li><li><a href="global.html#shouldInjectWeb3">shouldInjectWeb3</a></li><li><a href="global.html#suffixCheck">suffixCheck</a></li></ul>
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<h1 class="page-title">contentscript.js</h1>
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<pre class="prettyprint source linenums"><code>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 ${remoteLabel}`
if (err) warningMsg += '\n' + err.stack
console.warn(warningMsg)
}
/**
* Determines if Web3 should be injected
*
* @returns {boolean} True of Web3 should be injected
*/
function shouldInjectWeb3 () {
return doctypeCheck() && suffixCheck()
&& documentElementCheck() && !blacklistedDomainCheck()
}
/**
* Checks the doctype of the current document if it exists
*
* @returns {boolean} True if the doctype is html or if none exists
*/
function doctypeCheck () {
const doctype = window.document.doctype
if (doctype) {
return doctype.name === 'html'
} else {
return true
}
}
/**
* Checks the current document extension
*
* @returns {boolean} True if the current extension is not prohibited
*/
function suffixCheck () {
var prohibitedTypes = ['xml', 'pdf']
var currentUrl = window.location.href
var currentRegex
for (let i = 0; i < prohibitedTypes.length; i++) {
currentRegex = new RegExp(`\\.${prohibitedTypes[i]}$`)
if (currentRegex.test(currentUrl)) {
return false
}
}
return true
}
/**
* Checks the documentElement of the current document
*
* @returns {boolean} True if the documentElement is an html node or if none exists
*/
function documentElementCheck () {
var documentElement = document.documentElement.nodeName
if (documentElement) {
return documentElement.toLowerCase() === 'html'
}
return true
}
/**
* Checks if the current domain is blacklisted
*
* @returns {boolean} True if the current domain is blacklisted
*/
function blacklistedDomainCheck () {
var blacklistedDomains = [
'uscourts.gov',
'dropbox.com',
'webbyawards.com',
]
var currentUrl = window.location.href
var currentRegex
for (let i = 0; i < blacklistedDomains.length; i++) {
const blacklistedDomain = blacklistedDomains[i].replace('.', '\\.')
currentRegex = new RegExp(`(?:https?:\\/\\/)(?:(?!${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'
}
</code></pre>
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