Add support for eth_signTypedData RPC call

Author: Bhargavasomu

web3/_utils/module_testing/eth_module.py

@@ -202,6 +202,76 @@ def test_eth_sign(self, web3, unlocked_account_dual_type):
         )
         assert new_signature != signature
 
+    def test_eth_signTypedData(self, web3, unlocked_account_dual_type):
+        validJSONMessage = '''
+            {
+                "types": {
+                    "EIP712Domain": [
+                        {"name": "name", "type": "string"},
+                        {"name": "version", "type": "string"},
+                        {"name": "chainId", "type": "uint256"},
+                        {"name": "verifyingContract", "type": "address"}
+                    ],
+                    "Person": [
+                        {"name": "name", "type": "string"},
+                        {"name": "wallet", "type": "address"}
+                    ],
+                    "Mail": [
+                        {"name": "from", "type": "Person"},
+                        {"name": "to", "type": "Person"},
+                        {"name": "contents", "type": "string"}
+                    ]
+                },
+                "primaryType": "Mail",
+                "domain": {
+                    "name": "Ether Mail",
+                    "version": "1",
+                    "chainId": 1,
+                    "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
+                },
+                "message": {
+                    "from": {
+                        "name": "Cow",
+                        "wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
+                    },
+                    "to": {
+                        "name": "Bob",
+                        "wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
+                    },
+                    "contents": "Hello, Bob!"
+                }
+            }
+        '''
+        signature = web3.eth.signTypedData(
+            unlocked_account_dual_type,
+            validJSONMessage
+        )
+        assert is_bytes(signature)
+        assert len(signature) == 32 + 32 + 1
+
+        # # test other formats
+        # hexsign = web3.eth.sign(
+        #     unlocked_account_dual_type,
+        #     hexstr='0x4d6573736167652074c3b6207369676e2e204c6f6e676572207468616e206861736821'
+        # )
+        # assert hexsign == signature
+        #
+        # intsign = web3.eth.sign(
+        #     unlocked_account_dual_type,
+        #     0x4d6573736167652074c3b6207369676e2e204c6f6e676572207468616e206861736821
+        # )
+        # assert intsign == signature
+        #
+        # bytessign = web3.eth.sign(
+        #     unlocked_account_dual_type, b'Message t\xc3\xb6 sign. Longer than hash!'
+        # )
+        # assert bytessign == signature
+        #
+        # new_signature = web3.eth.sign(
+        #     unlocked_account_dual_type, text='different message is different'
+        # )
+        # assert new_signature != signature
+
     def test_eth_signTransaction(self, web3, unlocked_account):
         txn_params = {
             'from': unlocked_account,

web3/_utils/rpc_abi.py

@@ -52,6 +52,7 @@
     'eth_sendTransaction': TRANSACTION_PARAMS_ABIS,
     'eth_signTransaction': TRANSACTION_PARAMS_ABIS,
     'eth_sign': ['address', 'bytes'],
+    'eth_signTypedData': ['address', None],
     'eth_submitHashrate': ['uint', 'bytes32'],
     'eth_submitWork': ['bytes8', 'bytes32', 'bytes32'],
     # personal

web3/eth.py

@@ -320,6 +320,11 @@ def signTransaction(self, transaction):
             "eth_signTransaction", [transaction],
         )
 
+    def signTypedData(self, account, jsonMessage):
+        return self.web3.manager.request_blocking(
+            "eth_signTypedData", [account, jsonMessage],
+        )
+
     @apply_to_return_value(HexBytes)
     def call(self, transaction, block_identifier=None):
         # TODO: move to middleware

web3/middleware/exception_retry_request.py

@@ -47,6 +47,7 @@
     'eth_getCompilers',
     'eth_getWork',
     'eth_sign',
+    'eth_signTypedData',
     'eth_sendRawTransaction',
     'personal_importRawKey',
     'personal_newAccount',

web3/middleware/pythonic.py

@@ -355,6 +355,7 @@ def to_hexbytes(num_bytes, val, variable_length=False):
         'eth_sendTransaction': to_hexbytes(32),
         'eth_signTransaction': apply_formatter_if(is_not_null, signed_tx_formatter),
         'eth_sign': HexBytes,
+        'eth_signTypedData': HexBytes,
         'eth_syncing': apply_formatter_if(is_not_false, syncing_formatter),
         # personal
         'personal_importRawKey': to_checksum_address,