Merge pull request #5792 from MetaMask/signed-type-data-error-hw-wallet

Consider HW Wallets for signTypedMessage

app/scripts/metamask-controller.js

@@ -50,6 +50,7 @@ const seedPhraseVerifier = require('./lib/seed-phrase-verifier')
 const log = require('loglevel')
 const TrezorKeyring = require('eth-trezor-keyring')
 const LedgerBridgeKeyring = require('eth-ledger-bridge-keyring')
+const HW_WALLETS_KEYRINGS = [TrezorKeyring.type, LedgerBridgeKeyring.type]
 const EthQuery = require('eth-query')
 const ethUtil = require('ethereumjs-util')
 const sigUtil = require('eth-sig-util')
@@ -1025,16 +1026,22 @@ module.exports = class MetamaskController extends EventEmitter {
       const cleanMsgParams = await this.typedMessageManager.approveMessage(msgParams)
       const address = sigUtil.normalize(cleanMsgParams.from)
       const keyring = await this.keyringController.getKeyringForAccount(address)
-      const wallet = keyring._getWalletForAccount(address)
-      const privKey = ethUtil.toBuffer(wallet.getPrivateKey())
       let signature
-      switch (version) {
-        case 'V1':
-          signature = sigUtil.signTypedDataLegacy(privKey, { data: cleanMsgParams.data })
-          break
-        case 'V3':
-          signature = sigUtil.signTypedData(privKey, { data: JSON.parse(cleanMsgParams.data) })
-          break
+      // HW Wallet keyrings don't expose private keys
+      // so we need to handle it separately
+      if (!HW_WALLETS_KEYRINGS.includes(keyring.type)) {
+        const wallet = keyring._getWalletForAccount(address)
+        const privKey = ethUtil.toBuffer(wallet.getPrivateKey())
+        switch (version) {
+          case 'V1':
+            signature = sigUtil.signTypedDataLegacy(privKey, { data: cleanMsgParams.data })
+            break
+          case 'V3':
+            signature = sigUtil.signTypedData(privKey, { data: JSON.parse(cleanMsgParams.data) })
+            break
+        }
+      } else {
+        signature = await keyring.signTypedData(address, cleanMsgParams.data)
       }
       this.typedMessageManager.setMsgStatusSigned(msgId, signature)
       return this.getState()