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const XHR = window.XMLHttpRequest
// const fauxJax = require('faux-jax')
// fauxJax.install()
const Web3 = require('web3')
const createPayload = require('web3-provider-engine/util/create-payload')
const StreamProvider = require('./lib/stream-provider.js')
const LocalMessageDuplexStream = require('./lib/local-message-stream.js')
const RPC_URL = 'https://rawtestrpc.metamask.io/'
//
// setup plugin communication
//
var pluginStream = new LocalMessageDuplexStream({
name: 'inpage',
target: 'contentscript',
})
var remoteProvider = new StreamProvider()
remoteProvider.pipe(pluginStream).pipe(remoteProvider)
pluginStream.on('error', console.error.bind(console))
remoteProvider.on('error', console.error.bind(console))
//
// handle synchronous requests
//
// handle accounts cache
var accountsCache = []
setInterval(populateAccountsCache, 4000)
function populateAccountsCache(){
remoteProvider.sendAsync(createPayload({
method: 'eth_accounts',
params: [],
isMetamaskInternal: true,
}), function(err, response){
if (err) return console.error('MetaMask - Error polling accounts')
// update localStorage
var accounts = response.result
if (accounts.toString() !== accountsCache.toString()) {
accountsCache = accounts
localStorage['MetaMask-Accounts'] = JSON.stringify(accounts)
}
})
}
// handle synchronous methods via standard http provider
var syncProvider = new Web3.providers.HttpProvider(RPC_URL)
remoteProvider.send = function(payload){
var result = null
switch (payload.method) {
case 'eth_accounts':
// read from localStorage
accountsCache = JSON.parse(localStorage['MetaMask-Accounts'] || '[]')
result = accountsCache
break
case 'eth_coinbase':
// read from localStorage
accountsCache = JSON.parse(localStorage['MetaMask-Accounts'] || '[]')
result = accountsCache[0] || '0x0000000000000000000000000000000000000000'
break
// fallback to normal rpc
default:
return syncProvider.send(payload)
}
// return the result
return {
id: payload.id,
jsonrpc: payload.jsonrpc,
result: result,
}
}
//
// global web3
//
var web3 = new Web3(remoteProvider)
window.web3 = web3
web3.setProvider = function(){
console.log('MetaMask - overrode web3.setProvider')
}
console.log('MetaMask - injected web3')
//
// intercept local node requests
//
// console.log('MetaMask - intercepting localhost:8545 requests')
// fauxJax.on('request', function(req){
// // check if local node request
// if (req.requestURL.indexOf('localhost:8545') !== -1) {
// var rpcReq = JSON.parse(req.requestBody)
// if (req.async) {
// remoteProvider.sendAsync(rpcReq, function(err, result){
// // console.log('intercepted request (async):', rpcReq, result)
// handleResult(result)
// })
// } else {
// var result = remoteProvider.send(rpcReq)
// // console.log('intercepted request (sync):', rpcReq, result)
// handleResult(result)
// }
// } else {
// // console.log('request continuing normally:', req.requestURL)
// continueRequestNormally(req)
// }
// function handleResult(result){
// var serializedResult = JSON.stringify(result)
// req.respond(200, {
// 'content-type': 'application/json',
// }, serializedResult)
// }
// })
// function continueRequestNormally(req){
// var xhr = new XHR()
// // set target url and method
// xhr.open(req.requestMethod, req.requestURL, req.async)
// // set headers
// Object.keys(req.requestHeaders || {}).forEach(function(headerKey){
// xhr.setRequestHeader(headerKey, req.requestHeaders[headerKey])
// })
// // send and call completion handler
// if (req.async) {
// xhr.onload = copyResult
// xhr.send(req.requestBody)
// } else {
// xhr.send(req.requestBody)
// copyResult()
// }
// function copyResult() {
// var headers = extractResponseHeaders(xhr.getAllResponseHeaders())
// req.respond(xhr.status, headers, xhr.response)
// }
// }
// function extractResponseHeaders(rawHeaders){
// var headers = {}
// var headerKeyValues = rawHeaders.split('\r\n').filter(Boolean)
// headerKeyValues.forEach(function(keyValue){
// var data = keyValue.split(': ')
// headers[data[0]] = data[1]
// })
// return headers
// }
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