sign transactions is pretty close

app/scripts/lib/trezorKeyring.js

@@ -4,10 +4,11 @@ const ethUtil = require('ethereumjs-util')
 
 const hdPathString = `m/44'/60'/0'/0`
 const keyringType = 'Trezor Hardware'
-
+const Transaction = require('ethereumjs-tx')
+const pathBase = 'm'
 const TrezorConnect = require('./trezor-connect.js')
 const HDKey = require('hdkey')
-const TREZOR_FIRMWARE_VERSION = '1.4.0'
+const TREZOR_MIN_FIRMWARE_VERSION = '1.5.2'
 const log = require('loglevel')
 
 class TrezorKeyring extends EventEmitter {
@@ -19,7 +20,7 @@ class TrezorKeyring extends EventEmitter {
     this.deserialize(opts)
     this.page = 0
     this.perPage = 5
-    this.accountToUnlock = 0
+    this.unlockedAccount = 0
   }
 
   serialize () {
@@ -53,13 +54,13 @@ class TrezorKeyring extends EventEmitter {
             reject(response.error || 'Unknown error')
           }
         },
-        TREZOR_FIRMWARE_VERSION
+        TREZOR_MIN_FIRMWARE_VERSION
       )
     })
   }
 
   setAccountToUnlock (index) {
-    this.accountToUnlock = parseInt(index, 10)
+    this.unlockedAccount = parseInt(index, 10)
   }
 
   addAccounts (n = 1) {
@@ -67,18 +68,13 @@ class TrezorKeyring extends EventEmitter {
     return new Promise((resolve, reject) => {
       return this.unlock()
         .then(_ => {
-          const pathBase = 'm'
-          const from = this.accountToUnlock
+          const from = this.unlockedAccount
           const to = from + 1
-
           this.accounts = []
 
           for (let i = from; i < to; i++) {
-            const dkey = this.hdk.derive(`${pathBase}/${i}`)
-            const address = ethUtil
-              .publicToAddress(dkey.publicKey, true)
-              .toString('hex')
-            this.accounts.push(ethUtil.toChecksumAddress(address))
+
+            this.accounts.push(this.getEthAddress(pathBase, i))
             this.page = 0
           }
           resolve(this.accounts)
@@ -94,19 +90,16 @@ class TrezorKeyring extends EventEmitter {
     return new Promise((resolve, reject) => {
       return this.unlock()
         .then(_ => {
-          const pathBase = 'm'
+
           const from = this.page === 0 ? 0 : (this.page - 1) * this.perPage
           const to = from + this.perPage
 
           const accounts = []
 
           for (let i = from; i < to; i++) {
-            const dkey = this.hdk.derive(`${pathBase}/${i}`)
-            const address = ethUtil
-              .publicToAddress(dkey.publicKey, true)
-              .toString('hex')
+
             accounts.push({
-              address: ethUtil.toChecksumAddress(address),
+              address: this.getEthAddress(pathBase, i),
               balance: 0,
               index: i,
             })
@@ -134,40 +127,75 @@ class TrezorKeyring extends EventEmitter {
     return Promise.resolve(this.accounts.slice())
   }
 
+  padLeftEven (hex) {
+    return hex.length % 2 !== 0 ? `0${hex}` : hex
+  }
+
+  cleanData (buf) {
+    return this.padLeftEven(ethUtil.bufferToHex(buf).substring(2).toLowerCase())
+  }
+
+  getEthAddress (pathBase, i) {
+    const dkey = this.hdk.derive(`${pathBase}/${i}`)
+    const address = ethUtil
+      .publicToAddress(dkey.publicKey, true)
+      .toString('hex')
+    return ethUtil.toChecksumAddress(address)
+  }
+
   // tx is an instance of the ethereumjs-transaction class.
   async signTransaction (address, tx) {
-    throw new Error('Not supported on this device')
-    /*
-    await this.lock.acquire()
-    try {
 
-      // Look before we leap
-      await this._checkCorrectTrezorAttached()
+      return new Promise((resolve, reject) => {
+        log.debug('sign transaction ', address, tx)
+        const account = `m/44'/60'/0'/${this.unlockedAccount}`
+
+        const txData = {
+          account,
+          nonce: this.cleanData(tx.nonce),
+          gasPrice: this.cleanData(tx.gasPrice),
+          gasLimit: this.cleanData(tx.gasLimit),
+          to: this.cleanData(tx.to),
+          value: this.cleanData(tx.value),
+          data: this.cleanData(tx.data),
+          chainId: tx._chainId,
+        }
 
-      let accountId = await this._findAddressId(address)
-      let eth = await this._getEth()
-      tx.v = tx._chainId
-      let TrezorSig = await eth.signTransaction(
-        this._derivePath(accountId),
-        tx.serialize().toString('hex')
-      )
-      tx.v = parseInt(TrezorSig.v, 16)
-      tx.r = '0x' + TrezorSig.r
-      tx.s = '0x' + TrezorSig.s
+        TrezorConnect.ethereumSignTx(
+          txData.account,
+          txData.nonce,
+          txData.gasPrice,
+          txData.gasLimit,
+          txData.to,
+          txData.value,
+          txData.data === '' ? null : txData.data,
+          txData.chainId,
+          response => {
+            if (response.success) {
+              tx.v = `0x${response.v.toString(16)}`
+              tx.r = `0x${response.r}`
+              tx.s = `0x${response.s}`
+              log.debug('about to create new tx with data', tx)
 
-      // Since look before we leap check is racy, also check that signature is for account expected
-      let addressSignedWith = ethUtil.bufferToHex(tx.getSenderAddress())
-      if (addressSignedWith.toLowerCase() !== address.toLowerCase()) {
-        throw new Error(
-          `Signature is for ${addressSignedWith} but expected ${address} - is the correct Trezor device attached?`
-        )
+              const signedTx = new Transaction(tx)
+
+              log.debug('signature is valid?', signedTx.verifySignature())
+
+              const addressSignedWith = ethUtil.toChecksumAddress(`0x${signedTx.from.toString('hex')}`)
+              const correctAddress = ethUtil.toChecksumAddress(address)
+              if (addressSignedWith !== correctAddress) {
+                // throw new Error('signature doesnt match the right address')
+                log.error('signature doesnt match the right address', addressSignedWith, correctAddress)
               }
 
-      return tx
+              resolve(signedTx)
 
-    } finally {
-      await this.lock.release()
-    }*/
+            } else {
+                throw new Error(response.error || 'Unknown error')
+            }
+          },
+          TREZOR_MIN_FIRMWARE_VERSION)
+     })
   }
 
   async signMessage (withAccount, data) {