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const LocalMessageDuplexStream = require('./lib/local-message-stream.js')
const PortStream = require('./lib/port-stream.js')
const ObjectMultiplex = require('./lib/obj-multiplex')
const urlUtil = require('url')
if (shouldInjectWeb3()) {
setupInjection()
}
function setupInjection(){
// inject in-page script
var scriptTag = document.createElement('script')
scriptTag.src = chrome.extension.getURL('scripts/inpage.js')
scriptTag.onload = function () { this.parentNode.removeChild(this) }
var container = document.head || document.documentElement
// append as first child
container.insertBefore(scriptTag, container.children[0])
// setup communication to page and plugin
var pageStream = new LocalMessageDuplexStream({
name: 'contentscript',
target: 'inpage',
})
pageStream.on('error', console.error.bind(console))
var pluginPort = chrome.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 urlData = urlUtil.parse(window.location.href)
var extension = urlData.pathname.split('.').slice(-1)[0]
var shouldInject = (extension !== 'pdf')
return shouldInject
}
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