feat: add token approve builder

crypto/enums/abi_function.py

@@ -8,3 +8,6 @@ class AbiFunction(Enum):
     USERNAME_RESIGNATION = 'resignUsername'
     VALIDATOR_REGISTRATION = 'registerValidator'
     VALIDATOR_RESIGNATION = 'resignValidator'
+    UPDATE_VALIDATOR = 'updateValidator'
+    TRANSFER = 'transfer'
+    APPROVE = 'approve'

crypto/enums/contract_abi_type.py

@@ -4,4 +4,5 @@ class ContractAbiType(Enum):
     CUSTOM = 'custom'
     CONSENSUS = 'consensus'
     MULTIPAYMENT = 'multipayment'
+    TOKEN = 'token'
     USERNAMES = 'usernames'

crypto/transactions/builder/token_approve_builder.py

@@ -0,0 +1,27 @@
+from crypto.enums.abi_function import AbiFunction
+from crypto.enums.contract_abi_type import ContractAbiType
+from crypto.transactions.builder.abstract_transaction_builder import (
+    AbstractTransactionBuilder,
+)
+from crypto.transactions.types.evm_call import EvmCall
+from crypto.utils.abi_encoder import AbiEncoder
+from crypto.utils.transaction_utils import TransactionUtils
+
+
+class TokenApproveBuilder(AbstractTransactionBuilder):
+    def contract_address(self, address):
+        self.transaction.data['to'] = address
+        return self
+
+    def spender(self, address, amount):
+        encoder = AbiEncoder(ContractAbiType.TOKEN)
+        payload = encoder.encode_function_call(
+            AbiFunction.APPROVE.value, [address, amount]
+        )
+        self.transaction.data['data'] = TransactionUtils.parse_hex_from_str(
+            payload
+        )
+        return self
+
+    def get_transaction_instance(self, data):
+        return EvmCall(data)

crypto/transactions/builder/token_transfer_builder.py

@@ -0,0 +1,27 @@
+from crypto.enums.abi_function import AbiFunction
+from crypto.enums.contract_abi_type import ContractAbiType
+from crypto.transactions.builder.abstract_transaction_builder import (
+    AbstractTransactionBuilder,
+)
+from crypto.transactions.types.evm_call import EvmCall
+from crypto.utils.abi_encoder import AbiEncoder
+from crypto.utils.transaction_utils import TransactionUtils
+
+
+class TokenTransferBuilder(AbstractTransactionBuilder):
+    def contract_address(self, address):
+        self.transaction.data['to'] = address
+        return self
+
+    def recipient(self, address, amount):
+        encoder = AbiEncoder(ContractAbiType.TOKEN)
+        payload = encoder.encode_function_call(
+            AbiFunction.TRANSFER.value, [address, amount]
+        )
+        self.transaction.data['data'] = TransactionUtils.parse_hex_from_str(
+            payload
+        )
+        return self
+
+    def get_transaction_instance(self, data):
+        return EvmCall(data)