1 files changed, 71 insertions, 0 deletions
diff --git a/app/scripts/lib/resolver.js b/app/scripts/lib/resolver.js
new file mode 100644
index 000000000..ff0fed161
--- /dev/null
+++ b/app/scripts/lib/resolver.js
@@ -0,0 +1,71 @@
+const namehash = require('eth-ens-namehash')
+const multihash = require('multihashes')
+const HttpProvider = require('ethjs-provider-http')
+const Eth = require('ethjs-query')
+const EthContract = require('ethjs-contract')
+const registrarAbi = require('./contracts/registrar')
+const resolverAbi = require('./contracts/resolver')
+
+function ens (name, provider) {
+  const eth = new Eth(new HttpProvider(getProvider(provider.type)))
+  const hash = namehash.hash(name)
+  const contract = new EthContract(eth)
+  const Registrar = contract(registrarAbi).at(getRegistrar(provider.type))
+  return new Promise((resolve, reject) => {
+    if (provider.type === 'mainnet' || provider.type === 'ropsten') {
+      Registrar.resolver(hash).then((address) => {
+        if (address === '0x0000000000000000000000000000000000000000') {
+          reject(null)
+        } else {
+          const Resolver = contract(resolverAbi).at(address['0'])
+          return Resolver.content(hash)
+        }
+      }).then((contentHash) => {
+        if (contentHash['0'] === '0x0000000000000000000000000000000000000000000000000000000000000000') reject(null)
+        if (contentHash.ret !== '0x') {
+          const hex = contentHash['0'].substring(2)
+          const buf = multihash.fromHexString(hex)
+          resolve(multihash.toB58String(multihash.encode(buf, 'sha2-256')))
+        } else {
+          reject(null)
+        }
+      })
+    } else {
+      return reject('unsupport')
+    }
+  })
+}
+
+function getProvider (type) {
+  switch (type) {
+    case 'mainnet':
+      return 'https://mainnet.infura.io/'
+    case 'ropsten':
+      return 'https://ropsten.infura.io/'
+    default:
+      return 'http://localhost:8545/'
+  }
+}
+
+function getRegistrar (type) {
+  switch (type) {
+    case 'mainnet':
+      return '0x314159265dd8dbb310642f98f50c066173c1259b'
+    case 'ropsten':
+      return '0x112234455c3a32fd11230c42e7bccd4a84e02010'
+    default:
+      return '0x0000000000000000000000000000000000000000'
+  }
+}
+
+module.exports.resolve = function (name, provider) {
+  const path = name.split('.')
+  const topLevelDomain = path[path.length - 1]
+  if (topLevelDomain === 'eth' || topLevelDomain === 'test') {
+    return ens(name, provider)
+  } else {
+    return new Promise((resolve, reject) => {
+      reject(null)
+    })
+  }
+}