electron/lib/renderer/content-scripts-injector.js
2017-07-07 04:14:36 +02:00

61 lines
2.1 KiB
JavaScript

const {ipcRenderer} = require('electron')
const {runInThisContext} = require('vm')
// Check whether pattern matches.
// https://developer.chrome.com/extensions/match_patterns
const matchesPattern = function (pattern) {
if (pattern === '<all_urls>') return true
const regexp = new RegExp('^' + pattern.replace(/\*/g, '.*') + '$')
const url = location.protocol + '//' + location.host + location.pathname
return url.match(regexp)
}
// Run the code with chrome API integrated.
const runContentScript = function (extensionId, url, code) {
const context = {}
require('./chrome-api').injectTo(extensionId, false, context)
const wrapper = `(function (chrome) {\n ${code}\n })`
const compiledWrapper = runInThisContext(wrapper, {
filename: url,
lineOffset: 1,
displayErrors: true
})
return compiledWrapper.call(this, context.chrome)
}
// Run injected scripts.
// https://developer.chrome.com/extensions/content_scripts
const injectContentScript = function (extensionId, script) {
for (const match of script.matches) {
if (!matchesPattern(match)) return
}
for (const {url, code} of script.js) {
const fire = runContentScript.bind(window, extensionId, url, code)
if (script.runAt === 'document_start') {
process.once('document-start', fire)
} else if (script.runAt === 'document_end') {
process.once('document-end', fire)
} else if (script.runAt === 'document_idle') {
document.addEventListener('DOMContentLoaded', fire)
}
}
}
// Handle the request of chrome.tabs.executeJavaScript.
ipcRenderer.on('CHROME_TABS_EXECUTESCRIPT', function (event, senderWebContentsId, requestId, extensionId, url, code) {
const result = runContentScript.call(window, extensionId, url, code)
ipcRenderer.sendToAll(senderWebContentsId, `CHROME_TABS_EXECUTESCRIPT_RESULT_${requestId}`, result)
})
// Read the renderer process preferences.
const preferences = process.getRenderProcessPreferences()
if (preferences) {
for (const pref of preferences) {
if (pref.contentScripts) {
for (const script of pref.contentScripts) {
injectContentScript(pref.extensionId, script)
}
}
}
}