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Dapper / ERC-1271 wallet signature validation in Ruby
require 'web3/eth'
ERC_1271_MAGIC_VALUE = '1626ba7e'
ERC_1271_ABI = <<~JSON
[
{
"constant": true,
"inputs": [
{
"name": "hash",
"type": "bytes32"
},
{
"name": "_signature",
"type": "bytes"
}
],
"name": "isValidSignature",
"outputs": [
{
"name": "magicValue",
"type": "bytes4"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
]
JSON
rpc_host = 'mainnet.infura.io'
rpc_path = '/v3/YOUR_RPC_PATH_HERE'
web3 = Web3::Eth::Rpc.new host: rpc_host,
port: 443,
connect_options: {
use_ssl: true,
rpc_path: rpc_path
}
address = '0x77f7111B2b211BC504dE66b13F3A8a04cD182842'
challenge = Web3::Eth::Abi::Utils.keccak256('Follow Niftytown.com!')
signature = ['051912aa60d32687c0e9dc37d335b1bb226c24a31fca40a23cce11e8b417bee11ca668ead2e901ab276eea194e70c4eec71908f10fecc1390f187fb56d7ce2c81bd17faa5de3424c79cfc2dc8b0b074229efedc40cbeac8c835a373589b0b122277bae737503b29ceedf735ab2148523854be4818bb66c13a0b3f28349357678801c'].pack('H*')
contract = web3.eth.contract(ERC_1271_ABI)
wallet = contract.at(address)
result = wallet.isValidSignature(challenge, signature)
if result.unpack('H*').first == ERC_1271_MAGIC_VALUE
puts 'Authorized'
else
puts 'Unauthorized'
end
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