const LocalMessageDuplexStream = require('post-message-stream') const PortStream = require('./lib/port-stream.js') const ObjectMultiplex = require('./lib/obj-multiplex') const extension = require('./lib/extension') const fs = require('fs') const path = require('path') const inpageText = fs.readFileSync(path.join(__dirname + '/inpage.js')).toString() // 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() } function setupInjection(){ try { // inject in-page script var scriptTag = document.createElement('script') scriptTag.src = extension.extension.getURL('scripts/inpage.js') scriptTag.textContent = inpageText 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) } } function setupStreams(){ // setup communication to page and plugin var pageStream = new LocalMessageDuplexStream({ name: 'contentscript', target: 'inpage', }) pageStream.on('error', console.error.bind(console)) var pluginPort = extension.runtime.connect({name: 'contentscript'}) var pluginStream = new PortStream(pluginPort) pluginStream.on('error', console.error.bind(console)) // forward communication plugin->inpage pageStream.pipe(pluginStream).pipe(pageStream) // connect contentscript->inpage reload stream var mx = ObjectMultiplex() mx.on('error', console.error.bind(console)) mx.pipe(pageStream) var reloadStream = mx.createStream('reload') reloadStream.on('error', console.error.bind(console)) // if we lose connection with the plugin, trigger tab refresh pluginStream.on('close', function () { reloadStream.write({ method: 'reset' }) }) } function shouldInjectWeb3(){ var shouldInject = (window.location.href.indexOf('.pdf') === -1) return shouldInject }