Implement external signer

python/CHANGELOG

@@ -1,3 +1,6 @@
+- 0.1.0-unreleased
+	* Implement external signer
+	* Standardize cli arg flags
 - 0.0.3
 	* Add viewer cli
 - 0.0.2

python/eth_address_declarator/runnable/add.py

@@ -13,7 +13,9 @@ import logging
 
 # third-party imports
 import web3
-
+from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
+from crypto_dev_signer.keystore import DictKeystore
+from crypto_dev_signer.eth.helper import EthTxExecutor
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -26,33 +28,62 @@ data_dir = os.path.join(script_dir, '..', 'data')
 
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
 argparser.add_argument('-r', '--contract-address', dest='r', type=str, help='Address declaration contract address')
-argparser.add_argument('-o', '--declarator-address', dest='o', type=str, help='Signing address for the declaration')
+argparser.add_argument('-a', '--signer-address', dest='a', type=str, help='Accounts declarator owner')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 argparser.add_argument('address', type=str, help='Ethereum address to add declaration to')
 argparser.add_argument('declaration', type=str, help='SHA256 sum of endorsement data to add')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
+
+block_last = args.w
+block_all = args.ww
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    logg.debug('now have key for signer address {}'.format(signer_address))
+signer = EIP155Signer(keystore)
+
+chain_pair = args.i.split(':')
+chain_id = int(chain_pair[1])
+
+helper = EthTxExecutor(
+        w3,
+        signer_address,
+        signer,
+        chain_id,
+        block=args.ww,
+    )
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
-
     f = open(os.path.join(args.abi_dir, 'AddressDeclarator.json'), 'r')
     abi = json.load(f)
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
-    if args.o != None:
-        w3.eth.defaultAccount = args.o
-    logg.debug('endorser address {}'.format(w3.eth.defaultAccount))
-
     c = w3.eth.contract(abi=abi, address=args.r)
 
-    tx_hash = c.functions.addDeclaration(args.address, args.declaration).transact()
+    (tx_hash, rcpt) = helper.sign_and_send(
-    print(tx_hash.hex())
+            [
+                c.functions.addDeclaration(args.address, args.declaration).buildTransaction,
+                ],
+            )
+    print(tx_hash)
 
 
 if __name__ == '__main__':

python/eth_address_declarator/runnable/deploy.py

@@ -13,7 +13,9 @@ import logging
 
 # third-party imports
 import web3
-
+from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
+from crypto_dev_signer.keystore import DictKeystore
+from crypto_dev_signer.eth.helper import EthTxExecutor
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -26,18 +28,48 @@ data_dir = os.path.join(script_dir, '..', 'data')
 
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
-argparser.add_argument('-o', '--owner', dest='o', type=str, help='Accounts declarator owner')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
+argparser.add_argument('-a', '--signer-address', dest='a', type=str, help='Accounts declarator owner')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 argparser.add_argument('owner_description_digest', type=str, help='SHA256 of description metadata of contract deployer')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
+
+block_last = args.w
+block_all = args.ww
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    logg.debug('now have key for signer address {}'.format(signer_address))
+signer = EIP155Signer(keystore)
+
+chain_pair = args.i.split(':')
+chain_id = int(chain_pair[1])
+
+helper = EthTxExecutor(
+        w3,
+        signer_address,
+        signer,
+        chain_id,
+        block=args.ww,
+    )
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
-
     f = open(os.path.join(args.abi_dir, 'AddressDeclarator.json'), 'r')
     abi = json.load(f)
     f.close()
@@ -46,15 +78,15 @@ def main():
     bytecode = f.read()
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
-    if args.o != None:
-        w3.eth.defaultAccount = args.o
-    logg.debug('owner address {}'.format(w3.eth.defaultAccount))
-
     c = w3.eth.contract(abi=abi, bytecode=bytecode)
     logg.info('digest {}'.format(args.owner_description_digest))
-    tx_hash = c.constructor(args.owner_description_digest).transact()
 
+    (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.constructor(args.owner_description_digest).buildTransaction,
+                ],
+                force_wait=True,
+            )
     rcpt = w3.eth.getTransactionReceipt(tx_hash)
 
     print(rcpt.contractAddress)

python/eth_address_declarator/runnable/view.py

@@ -14,7 +14,7 @@ import logging
 
 # third-party imports
 import web3
-
+from crypto_dev_signer.keystore import DictKeystore
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -28,17 +28,23 @@ data_dir = os.path.join(script_dir, '..', 'data')
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
 argparser.add_argument('-r', '--contract-address', dest='r', type=str, help='Address declaration contract address')
-argparser.add_argument('-o', '--declarator-address', dest='o', type=str, help='Signing address for the declaration')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
+argparser.add_argument('-a', '-declarator-address', dest='a', type=str, help='Signing address for the declaration')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
 argparser.add_argument('--resolve', action='store_true', help='Attempt to resolve the hashes to actual content')
 argparser.add_argument('--resolve-http', dest='resolve_http', type=str, help='Base url to look up content hashes')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 argparser.add_argument('address', type=str, help='Ethereum declaration address to look up')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
 
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
 
 def try_sha256(s):
     r = urllib.request.urlopen(os.path.join(args.resolve_http, s.hex()))
@@ -47,22 +53,32 @@ def try_sha256(s):
 def try_utf8(s):
     return s.decode('utf-8')
 
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    logg.debug('now have key for signer address {}'.format(signer_address))
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
 
     f = open(os.path.join(args.abi_dir, 'AddressDeclarator.json'), 'r')
     abi = json.load(f)
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
+    declarator_address = signer_address
-    if args.o != None:
+    if declarator_address == None:
-        w3.eth.defaultAccount = args.o
+        declarator_address = args.a
-    logg.debug('endorser address {}'.format(w3.eth.defaultAccount))
+    if declarator_address == None:
+        sys.stderr.write('missing declarator address, specify -y or -a\n')
+        sys.exit(1)
+
+    logg.debug('declarator address {}'.format(declarator_address))
 
     c = w3.eth.contract(abi=abi, address=args.r)
 
-    declarations = c.functions.declaration(w3.eth.defaultAccount, args.address).call()
+    declarations = c.functions.declaration(declarator_address, args.address).call()
 
     for d in declarations:
         if not args.resolve:

python/eth_token_index/runnable/add.py

@@ -14,7 +14,9 @@ import hashlib
 
 # third-party imports
 import web3
-
+from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
+from crypto_dev_signer.keystore import DictKeystore
+from crypto_dev_signer.eth.helper import EthTxExecutor
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -27,19 +29,49 @@ data_dir = os.path.join(script_dir, '..', 'data')
 
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
 argparser.add_argument('-r', '--contract-address', dest='r', type=str, help='Token endorsement contract address')
-argparser.add_argument('-o', '--owner-address', dest='o', type=str, help='Address to use to sign endorsement transaction')
+argparser.add_argument('-a', '--signer-address', dest='a', type=str, help='Accounts declarator owner')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 argparser.add_argument('address', type=str, help='Ethereum address to add declaration to')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
+
+block_last = args.w
+block_all = args.ww
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    logg.debug('now have key for signer address {}'.format(signer_address))
+signer = EIP155Signer(keystore)
+
+chain_pair = args.i.split(':')
+chain_id = int(chain_pair[1])
+
+helper = EthTxExecutor(
+        w3,
+        signer_address,
+        signer,
+        chain_id,
+        block=args.ww,
+    )
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
-
     f = open(os.path.join(args.abi_dir, 'TokenUniqueSymbolIndex.json'), 'r')
     abi = json.load(f)
     f.close()
@@ -51,11 +83,6 @@ def main():
     t = w3.eth.contract(abi=erc20_abi, address=args.address)
     token_symbol = t.functions.symbol().call()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
-    if args.o != None:
-        w3.eth.defaultAccount = args.o
-    logg.debug('owner address {}'.format(w3.eth.defaultAccount))
-
     c = w3.eth.contract(abi=abi, address=args.r)
 
     h = hashlib.new('sha256')
@@ -63,8 +90,13 @@ def main():
     z = h.digest()
     logg.info('token symbol {} => {}'.format(token_symbol, z.hex()))
 
-    tx_hash = c.functions.register('0x' + z.hex(), args.address).transact()
+    (tx_hash, rcpt) = helper.sign_and_send(
-    print(tx_hash.hex())
+            [
+                c.functions.register('0x' + z.hex(), args.address).buildTransaction,
+                ],
+            )
+
+    print(tx_hash)
 
 
 if __name__ == '__main__':

python/eth_token_index/runnable/deploy.py

@@ -13,7 +13,9 @@ import logging
 
 # third-party imports
 import web3
-
+from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
+from crypto_dev_signer.keystore import DictKeystore
+from crypto_dev_signer.eth.helper import EthTxExecutor
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()
@@ -26,17 +28,47 @@ data_dir = os.path.join(script_dir, '..', 'data')
 
 argparser = argparse.ArgumentParser()
 argparser.add_argument('-p', '--provider', dest='p', default='http://localhost:8545', type=str, help='Web3 provider url (http only)')
-argparser.add_argument('-o', '--owner', dest='o', type=str, help='Accounts declarator owner')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, default='Ethereum:1', help='Chain specification string')
+argparser.add_argument('-w', action='store_true', help='Wait for the last transaction to be confirmed')
+argparser.add_argument('-ww', action='store_true', help='Wait for every transaction to be confirmed')
+argparser.add_argument('-a', '--signer-address', dest='a', type=str, help='Accounts declarator owner')
+argparser.add_argument('-y', '--key-file', dest='y', type=str, help='Ethereum keystore file to use for signing')
 argparser.add_argument('--abi-dir', dest='abi_dir', type=str, default=data_dir, help='Directory containing bytecode and abi (default: {})'.format(data_dir))
 argparser.add_argument('-v', action='store_true', help='Be verbose')
+argparser.add_argument('-vv', action='store_true', help='Be more verbose')
 args = argparser.parse_args()
 
-if args.v:
+if args.vv:
     logg.setLevel(logging.DEBUG)
+elif args.v:
+    logg.setLevel(logging.INFO)
+
+block_last = args.w
+block_all = args.ww
+
+w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
+
+signer_address = None
+keystore = DictKeystore()
+if args.y != None:
+    logg.debug('loading keystore file {}'.format(args.y))
+    signer_address = keystore.import_keystore_file(args.y)
+    logg.debug('now have key for signer address {}'.format(signer_address))
+signer = EIP155Signer(keystore)
+
+chain_pair = args.i.split(':')
+chain_id = int(chain_pair[1])
+
+helper = EthTxExecutor(
+        w3,
+        signer_address,
+        signer,
+        chain_id,
+        block=args.ww,
+    )
+
 
 def main():
-    w3 = web3.Web3(web3.Web3.HTTPProvider(args.p))
-
     f = open(os.path.join(args.abi_dir, 'TokenUniqueSymbolIndex.json'), 'r')
     abi = json.load(f)
     f.close()
@@ -45,16 +77,14 @@ def main():
     bytecode = f.read()
     f.close()
 
-    w3.eth.defaultAccount = w3.eth.accounts[0]
-    if args.o != None:
-        w3.eth.defaultAccount = args.o
-    logg.debug('owner address {}'.format(w3.eth.defaultAccount))
-
     c = w3.eth.contract(abi=abi, bytecode=bytecode)
-    tx_hash = c.constructor().transact()
-
-    rcpt = w3.eth.getTransactionReceipt(tx_hash)
 
+    (tx_hash, rcpt) = helper.sign_and_send(
+            [
+                c.constructor().buildTransaction,
+                ],
+                force_wait=True,
+            )
     print(rcpt.contractAddress)
 
 

python/setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = eth-address-index
-version = 0.0.3
+version = 0.1.0a1
 description = Signed metadata declarations for ethereum addresses
 author = Louis Holbrook
 author_email = dev@holbrook.no
@@ -30,6 +30,7 @@ packages =
 	eth_token_index.runnable
 install_requires =
 	web3==5.12.2
+	crypto-dev-signer~=0.4.13b2
 tests_require =
 	eth-tester==0.5.0b2
 	py-evm==0.3.0a20

solidity/AddressDeclarator.sol

@@ -1,4 +1,4 @@
-pragma solidity >=0.6.12;
+pragma solidity >0.6.11;
 
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -13,7 +13,7 @@ contract AddressDeclarator {
 	mapping( address => address[] ) declaratorReverse;
 	bytes32[][] public contents;
 
-	constructor(bytes32 _initialDescription) {
+	constructor(bytes32 _initialDescription) public {
 		bytes32[] memory foundation;
 
 		owner = msg.sender;

solidity/Makefile

@@ -1,19 +1,19 @@
+SOLC = /usr/bin/solc
+
 all:
-	solc AddressDeclarator.sol --abi | awk 'NR>3' > AddressDeclarator.json
+	$(SOLC) AddressDeclarator.sol --abi --evm-version byzantium | awk 'NR>3' > AddressDeclarator.json
-	solc AddressDeclarator.sol --bin | awk 'NR>3' > AddressDeclarator.bin
+	$(SOLC) AddressDeclarator.sol --bin --evm-version byzantium | awk 'NR>3' > AddressDeclarator.bin
 	truncate -s -1 AddressDeclarator.bin
-	solc TokenUniqueSymbolIndex.sol --abi | awk 'NR>3' > TokenUniqueSymbolIndex.json
+	$(SOLC) TokenUniqueSymbolIndex.sol --abi --evm-version byzantium | awk 'NR>3' > TokenUniqueSymbolIndex.json
-	solc TokenUniqueSymbolIndex.sol --bin | awk 'NR>3' > TokenUniqueSymbolIndex.bin
+	$(SOLC) TokenUniqueSymbolIndex.sol --bin --evm-version byzantium | awk 'NR>3' > TokenUniqueSymbolIndex.bin
 	truncate -s -1 TokenUniqueSymbolIndex.bin
 
-
-old:
-	solc TokenEndorser.sol --abi | awk 'NR>3' > TokenEndorser.json
-	solc TokenEndorser.sol --bin | awk 'NR>3' > TokenEndorser.bin
-	truncate -s -1 TokenEndorser.bin
-
 test: all
 	#python test.py
 	python test_tokenindex.py
+
+install: all
+	cp -v AddressDeclarator.{json,bin} ../python/eth_address_declarator/data/
+	cp -v TokenUniqueSymbolIndex.{json,bin} ../python/eth_token_index/data/
 	
-.PHONY: test
+.PHONY: test install

solidity/TokenEndorser.json

@@ -1 +0,0 @@
-[{"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"}]

solidity/TokenEndorser.sol

@@ -1,59 +0,0 @@
-pragma solidity >=0.6.12;
-
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-contract TokenEndorsement {
-
-	uint256 count;
-	mapping ( bytes32 => bytes32 ) public endorsement;
-	mapping ( address => uint256 ) public tokenIndex;
-	mapping ( address => uint256[] ) public endorser;
-	mapping ( address => uint256 ) public endorserTokenCount;
-	mapping ( string => address ) public tokenSymbolIndex;
-	address[] public tokens;
-
-	event EndorsementAdded(address indexed _token, address indexed _adder, uint256 indexed _index, bytes32 _data);
-
-	constructor() {
-		count = 1;
-		tokens.push(address(0x0));
-	}
-
-	function register(address _token) private returns (bool) {
-		if (tokenIndex[_token] > 0) {
-			return false;
-		}
-		(bool _ok, bytes memory _r) = _token.call(abi.encodeWithSignature('symbol()'));
-		require(_ok);
-
-		string memory token_symbol = abi.decode(_r, (string));
-		require(tokenSymbolIndex[token_symbol] == address(0));
-
-		tokens.push(_token);
-		tokenIndex[_token] = count;
-		tokenSymbolIndex[token_symbol] = _token;
-		count++;
-		return true;
-	}
-
-	function add(address _token, bytes32 _data) public returns (bool) {
-		register(_token);
-		bytes32 k;
-		bytes memory signMaterial = new bytes(40);
-		bytes memory addrBytes = abi.encodePacked(_token);
-		for (uint256 i = 0; i < 20; i++) {
-			signMaterial[i] = addrBytes[i];
-		}
-		addrBytes = abi.encodePacked(msg.sender);
-		for (uint256 i = 0; i < 20; i++) {
-			signMaterial[i+20] = addrBytes[i];
-		}
-		k = sha256(signMaterial);
-		require(endorsement[k] == bytes32(0x00));
-		endorsement[k] = _data;
-		endorser[msg.sender].push(tokenIndex[_token]);
-		endorserTokenCount[msg.sender]++;
-		emit EndorsementAdded(_token, msg.sender, count, _data);
-		return true;
-	}
-}

solidity/TokenUniqueSymbolIndex.sol

@@ -1,4 +1,4 @@
-pragma solidity >=0.6.12;
+pragma solidity >0.6.11;
 
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -10,7 +10,7 @@ contract TokenUniqueSymbolIndex {
 	mapping ( bytes32 => uint256 ) public registry;
 	address[] tokens;
 
-	constructor() {
+	constructor() public {
 		owner = msg.sender;
 		tokens.push(address(0));
 	}