1 files changed, 122 insertions, 0 deletions
diff --git a/app/scripts/lib/metamask-provider.js b/app/scripts/lib/metamask-provider.js
new file mode 100644
index 000000000..c52de82b4
--- /dev/null
+++ b/app/scripts/lib/metamask-provider.js
@@ -0,0 +1,122 @@
+var HttpProvider = require('web3/lib/web3/httpprovider.js')
+var ethUtils = require('ethereumjs-util')
+var async = require('async')
+
+module.exports = MetamaskProvider
+
+
+function MetamaskProvider(forwardPayload, host) {
+  this.handlers = []
+  this.forwardPayload = forwardPayload
+  this.http = new HttpProvider(host)
+}
+
+MetamaskProvider.prototype.send = function (payload) {
+  if (Array.isArray(payload)) {
+    return payload.map( this.handlePayload.bind(this) )
+  } else {
+    return this.handlePayload( payload )
+  }
+}
+
+MetamaskProvider.prototype.sendAsync = function (payload, cb) {
+  if (Array.isArray(payload)) {
+    async.map( payload, this.handlePayload.bind(this), cb )
+  } else {
+    this.handlePayload( payload, cb )
+  }
+}
+
+MetamaskProvider.prototype.handlePayload = function (payload, cb) {
+  var _this = this
+  var isSync = !cb
+  var resolvedSync = true
+  var result = undefined
+
+  // TODO - this should be injected from Vapor dapp starts
+  var exposedAccounts = ['0xa06ef3ed1ce41ade87f764de6ce8095c569d6d57']
+
+  switch (payload.method) {
+    
+    case 'web3_sha3':
+      var inputHex = stripHexStringPrefix(payload.params[0])
+      var hash = '0x'+ethUtils.sha3(new Buffer(inputHex, 'hex')).toString('hex')
+      return handleResult(null, wrapResponse(payload, hash))
+    
+    case 'eth_sendTransaction':
+      this.forwardPayload(payload)
+      return handleResult(null, wrapResponse(payload, ''))
+
+    case 'eth_coinbase':
+      var currentAddress = exposedAccounts[0]
+      return handleResult(null, wrapResponse(payload, currentAddress))
+
+    case 'eth_accounts':
+      return handleResult(null, wrapResponse(payload, exposedAccounts))
+
+    case 'eth_gasPrice':
+      // TODO - this should be dynamically set somehow
+      var gasPrice = '0x01'
+      return handleResult(null, wrapResponse(payload, [gasPrice]))
+
+    case 'eth_call':
+      var params = payload.params
+      // default 'from' to default account
+      var args = params[0]
+      if (!args.from) {
+        var currentAddress = exposedAccounts[0]
+        args.from = currentAddress
+      }
+      // default block to latest
+      params[1] = params[1] || 'latest'
+      // turn on debug trace
+      params[2] = global.DEBUG_RPC
+      return handleNormally()
+    
+    default:
+      return handleNormally()
+  }
+
+  resolvedSync = false
+
+  function handleNormally(){
+    if (isSync) {
+      return handleResult(null, _this.http.send(payload))
+    } else {
+      _this.http.sendAsync(payload, handleResult)
+    }
+  }
+
+  // helper for normalizing handling of sync+async responses
+  function handleResult(err, resp) {
+    if (isSync) {
+      return resp
+    } else {
+      if (resolvedSync) {
+        process.nextTick(cb.bind(null, err, resp))
+      } else {
+        cb(err, resp)
+      }
+    }
+  }
+}
+
+function wrapResponse(payload, result){
+  return {
+    jsonrpc: payload.jsonrpc,
+    id: payload.id,
+    result: result,
+  }
+}
+
+function stripHexStringPrefix(hex) {
+  if (!hex) {
+    return hex
+  }
+
+  if (hex.slice(0, 2) === '0x') {
+    return hex.slice(2);
+  } else {
+    return hex;
+  }
+}
+\ No newline at end of file