Add interface, contract token symbol external call

python/eth_token_endorser/__init__.py

@@ -0,0 +1 @@
+from .token import TokenEndorser

python/eth_token_endorser/data/TokenEndorser.json

@@ -1 +1 @@
-[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_token","type":"address"},{"indexed":true,"internalType":"address","name":"_adder","type":"address"},{"indexed":true,"internalType":"uint256","name":"_index","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"_data","type":"bytes32"}],"name":"EndorsementAdded","type":"event"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"bytes32","name":"_data","type":"bytes32"}],"name":"add","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"endorsement","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"endorsers","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tokens","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]
+[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_token","type":"address"},{"indexed":true,"internalType":"address","name":"_adder","type":"address"},{"indexed":true,"internalType":"uint256","name":"_index","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"_data","type":"bytes32"}],"name":"EndorsementAdded","type":"event"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"bytes32","name":"_data","type":"bytes32"}],"name":"add","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"endorsement","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"endorser","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"endorserTokenCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"","type":"string"}],"name":"tokenSymbolIndex","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tokens","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

python/eth_token_endorser/token.py

@@ -0,0 +1,79 @@
+# Author:	Louis Holbrook <dev@holbrook.no> 0826EDA1702D1E87C6E2875121D2E7BB88C2A746
+# SPDX-License-Identifier:	GPL-3.0-or-later
+# File-version: 1
+# Description: Python interface to abi and bin files for faucet contracts
+
+# standard imports
+import logging
+import json
+import os
+import hashlib
+
+logg = logging.getLogger(__name__)
+
+moddir = os.path.dirname(__file__)
+datadir = os.path.join(moddir, 'data')
+
+
+class TokenEndorser:
+
+    __abi = None
+    __bytecode = None
+    __address = None
+
+    def __init__(self, w3, address, signer_address=None):
+        abi = TokenEndorser.abi()
+        TokenEndorser.bytecode()
+        self.__address = address
+        self.contract = w3.eth.contract(abi=abi, address=address)
+        self.w3 = w3
+        if signer_address != None:
+            self.signer_address = signer_address
+        else:
+            if type(self.w3.eth.defaultAccount).__name__ == 'Empty':
+                self.w3.eth.defaultAccount = self.w3.eth.accounts[0]
+            self.signer_address = self.w3.eth.defaultAccount
+
+
+    @staticmethod
+    def abi():
+        if TokenEndorser.__abi == None:
+            f = open(os.path.join(datadir, 'TokenEndorser.json'), 'r')
+            TokenEndorser.__abi = json.load(f)
+            f.close()
+        return TokenEndorser.__abi
+
+
+    @staticmethod
+    def bytecode():
+        if TokenEndorser.__bytecode == None:
+            f = open(os.path.join(datadir, 'TokenEndorser.bin'))
+            TokenEndorser.__bytecode = f.read()
+            f.close()
+        return TokenEndorser.__bytecode
+
+
+    def token_from_symbol(self, symbol):
+        return self.contract.functions.tokenSymbolIndex(symbol).call()
+
+
+    def endorsed_tokens(self, endorser_address):
+        tokens = []
+        for i in range(self.contract.functions.endorserTokenCount(endorser_address).call()):
+            tidx = self.contract.functions.endorser(endorser_address, i).call()
+            t = self.contract.functions.tokens(tidx).call()
+            tokens.append(t)
+        return tokens
+
+
+    def add(self, token_address, data):
+        self.contract.functions.add(token_address, data).transact({'from': self.signer_address})
+
+
+def to_endorsement_key(token_address_hex, endorser_address_hex):
+    h = hashlib.new('sha256')
+    h.update(bytes.fromhex(token_address_hex[2:]))
+    h.update(bytes.fromhex(endorser_address_hex[2:]))
+    return h.digest()
+
+