Add support for eth_signTypedData_v4 (#6930)

4 files changed, 11 insertions, 4 deletions

diff --git a/app/scripts/controllers/network/createMetamaskMiddleware.js b/app/scripts/controllers/network/createMetamaskMiddleware.js
index 319c5bf3e..5dcd3a895 100644
--- a/app/scripts/controllers/network/createMetamaskMiddleware.js
+++ b/app/scripts/controllers/network/createMetamaskMiddleware.js
@@ -12,6 +12,7 @@ function createMetamaskMiddleware ({
   processEthSignMessage,
   processTypedMessage,
   processTypedMessageV3,
+  processTypedMessageV4,
   processPersonalMessage,
   getPendingNonce,
 }) {
@@ -27,6 +28,7 @@ function createMetamaskMiddleware ({
       processEthSignMessage,
       processTypedMessage,
       processTypedMessageV3,
+      processTypedMessageV4,
       processPersonalMessage,
     }),
     createPendingNonceMiddleware({ getPendingNonce }),
diff --git a/app/scripts/lib/typed-message-manager.js b/app/scripts/lib/typed-message-manager.js
index b10145f3b..5e2a4cd0a 100644
--- a/app/scripts/lib/typed-message-manager.js
+++ b/app/scripts/lib/typed-message-manager.js
@@ -141,6 +141,7 @@ module.exports = class TypedMessageManager extends EventEmitter {
         }, 'Expected EIP712 typed data')
         break
       case 'V3':
+      case 'V4':
         let data
         assert.equal(typeof params, 'object', 'Params should be an object.')
         assert.ok('data' in params, 'Params must include a data field.')
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 1007412c6..1bf34a074 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -341,6 +341,7 @@ module.exports = class MetamaskController extends EventEmitter {
       processEthSignMessage: this.newUnsignedMessage.bind(this),
       processTypedMessage: this.newUnsignedTypedMessage.bind(this),
       processTypedMessageV3: this.newUnsignedTypedMessage.bind(this),
+      processTypedMessageV4: this.newUnsignedTypedMessage.bind(this),
       processPersonalMessage: this.newUnsignedPersonalMessage.bind(this),
       getPendingNonce: this.getPendingNonce.bind(this),
     }
@@ -1141,6 +1142,9 @@ module.exports = class MetamaskController extends EventEmitter {
           case 'V3':
             signature = sigUtil.signTypedData(privKey, { data: JSON.parse(cleanMsgParams.data) })
             break
+          case 'V4':
+            signature = sigUtil.signTypedData_v4(privKey, { data: JSON.parse(cleanMsgParams.data) })
+            break
         }
       } else {
         signature = await keyring.signTypedData(address, cleanMsgParams.data)
@@ -1797,4 +1801,3 @@ module.exports = class MetamaskController extends EventEmitter {
     return this.keyringController.setLocked()
   }
 }
-
diff --git a/ui/app/components/app/signature-request.js b/ui/app/components/app/signature-request.js
index 9c0f53f57..039485f88 100644
--- a/ui/app/components/app/signature-request.js
+++ b/ui/app/components/app/signature-request.js
@@ -215,7 +215,7 @@ SignatureRequest.prototype.msgHexToText = function (hex) {
 }
 
 // eslint-disable-next-line react/display-name
-SignatureRequest.prototype.renderTypedDataV3 = function (data) {
+SignatureRequest.prototype.renderTypedData = function (data) {
   const { domain, message } = JSON.parse(data)
   return [
     h('div.request-signature__typed-container', [
@@ -267,8 +267,9 @@ SignatureRequest.prototype.renderBody = function () {
       }),
     }, [notice]),
 
-    h('div.request-signature__rows', type === 'eth_signTypedData' && version === 'V3' ?
-      this.renderTypedDataV3(data) :
+    h('div.request-signature__rows',
+      type === 'eth_signTypedData' && (version === 'V3' || version === 'V4') ?
+      this.renderTypedData(data) :
       rows.map(({ name, value }) => {
         if (typeof value === 'boolean') {
           value = value.toString()