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| 1 | +#!/usr/bin/env python3 |
| 2 | +"""Resolve an ENS name via local Reth (the same shape SNRC will use). |
| 3 | +
|
| 4 | +Usage: |
| 5 | + ./ens-lookup.py # defaults to simplexchat.eth |
| 6 | + ./ens-lookup.py vitalik.eth |
| 7 | + ./ens-lookup.py corevo.eth |
| 8 | +
|
| 9 | +Requires: pip install --break-system-packages 'eth-hash[pycryptodome]' |
| 10 | +""" |
| 11 | + |
| 12 | +import base64 |
| 13 | +import json |
| 14 | +import sys |
| 15 | +from urllib.request import Request, urlopen |
| 16 | + |
| 17 | +from eth_hash.auto import keccak |
| 18 | + |
| 19 | +RPC = "http://127.0.0.1:8545" |
| 20 | +# ENS Registry (current, post-2020 migration) |
| 21 | +ENS_REGISTRY = "0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e" |
| 22 | + |
| 23 | + |
| 24 | +def rpc(method, params): |
| 25 | + body = json.dumps({"jsonrpc": "2.0", "method": method, "params": params, "id": 1}).encode() |
| 26 | + req = Request(RPC, data=body, headers={"Content-Type": "application/json"}) |
| 27 | + res = json.loads(urlopen(req, timeout=15).read()) |
| 28 | + if "error" in res: |
| 29 | + raise RuntimeError(res["error"]) |
| 30 | + return res["result"] |
| 31 | + |
| 32 | + |
| 33 | +def namehash(name: str) -> bytes: |
| 34 | + """ENS namehash — recursive keccak256 over reversed labels.""" |
| 35 | + node = b"\x00" * 32 |
| 36 | + if name: |
| 37 | + for label in reversed(name.split(".")): |
| 38 | + node = keccak(node + keccak(label.encode())) |
| 39 | + return node |
| 40 | + |
| 41 | + |
| 42 | +def selector(signature: str) -> str: |
| 43 | + return "0x" + keccak(signature.encode())[:4].hex() |
| 44 | + |
| 45 | + |
| 46 | +def eth_call(to: str, data: str) -> str: |
| 47 | + return rpc("eth_call", [{"to": to, "data": data}, "latest"]) |
| 48 | + |
| 49 | + |
| 50 | +def decode_address(hex_data: str) -> str: |
| 51 | + return "0x" + hex_data[-40:] |
| 52 | + |
| 53 | + |
| 54 | +def decode_bytes(hex_data: str) -> bytes: |
| 55 | + raw = bytes.fromhex(hex_data[2:] if hex_data.startswith("0x") else hex_data) |
| 56 | + if len(raw) < 64: |
| 57 | + return b"" |
| 58 | + length = int.from_bytes(raw[32:64], "big") |
| 59 | + return raw[64:64 + length] |
| 60 | + |
| 61 | + |
| 62 | +def encode_text_call(node: bytes, key: str) -> str: |
| 63 | + """ABI-encode text(bytes32 node, string key). String arg is dynamic: |
| 64 | + offset (=0x40) + length + right-padded data.""" |
| 65 | + sel = selector("text(bytes32,string)") |
| 66 | + head = node.hex() + (0x40).to_bytes(32, "big").hex() |
| 67 | + key_bytes = key.encode() |
| 68 | + body = len(key_bytes).to_bytes(32, "big").hex() + key_bytes.hex() |
| 69 | + # right-pad to 32-byte boundary |
| 70 | + pad = (-len(key_bytes)) % 32 |
| 71 | + body += "00" * pad |
| 72 | + return sel + head + body |
| 73 | + |
| 74 | + |
| 75 | +def text(resolver: str, node: bytes, key: str) -> str: |
| 76 | + raw = decode_bytes(eth_call(resolver, encode_text_call(node, key))) |
| 77 | + return raw.decode("utf-8", errors="replace") if raw else "" |
| 78 | + |
| 79 | + |
| 80 | +# Common ENS text keys (ENSIP-5). Resolvers may return empty for any of these. |
| 81 | +TEXT_KEYS = [ |
| 82 | + "url", |
| 83 | + "avatar", |
| 84 | + "description", |
| 85 | + "email", |
| 86 | + "notice", |
| 87 | + "keywords", |
| 88 | + "com.twitter", |
| 89 | + "com.github", |
| 90 | + "com.discord", |
| 91 | + "org.telegram", |
| 92 | + "io.keybase", |
| 93 | + "xyz.farcaster", |
| 94 | +] |
| 95 | + |
| 96 | + |
| 97 | +def decode_contenthash(raw: bytes) -> str: |
| 98 | + """ENS contenthash → human-readable URI (best-effort).""" |
| 99 | + if not raw: |
| 100 | + return "(empty)" |
| 101 | + # Multicodec prefixes: |
| 102 | + # 0xe301 = ipfs-ns + dag-pb (CIDv0/v1) |
| 103 | + # 0xe501 = ipns-ns |
| 104 | + # 0xe40101701b... = swarm |
| 105 | + if raw[:2] == b"\xe3\x01": |
| 106 | + cid_bytes = raw[2:] |
| 107 | + # Base32 lowercase + 'b' prefix per CIDv1 spec |
| 108 | + b32 = base64.b32encode(cid_bytes).decode().lower().rstrip("=") |
| 109 | + return f"ipfs://b{b32}" |
| 110 | + if raw[:2] == b"\xe5\x01": |
| 111 | + cid_bytes = raw[2:] |
| 112 | + b32 = base64.b32encode(cid_bytes).decode().lower().rstrip("=") |
| 113 | + return f"ipns://b{b32}" |
| 114 | + return "0x" + raw.hex() |
| 115 | + |
| 116 | + |
| 117 | +def main(): |
| 118 | + name = sys.argv[1] if len(sys.argv) > 1 else "simplexchat.eth" |
| 119 | + |
| 120 | + print(f" name: {name}") |
| 121 | + node = namehash(name) |
| 122 | + print(f" namehash: 0x{node.hex()}") |
| 123 | + |
| 124 | + # 1. Ask the registry which resolver is responsible for this name |
| 125 | + resolver_data = selector("resolver(bytes32)") + node.hex() |
| 126 | + resolver_raw = eth_call(ENS_REGISTRY, resolver_data) |
| 127 | + resolver = decode_address(resolver_raw) |
| 128 | + print(f" resolver: {resolver}") |
| 129 | + if resolver == "0x0000000000000000000000000000000000000000": |
| 130 | + print(" → no resolver set for this name") |
| 131 | + return |
| 132 | + |
| 133 | + node_hex = node.hex() |
| 134 | + |
| 135 | + # 2. Ask the resolver for the address |
| 136 | + try: |
| 137 | + addr = decode_address(eth_call(resolver, selector("addr(bytes32)") + node_hex)) |
| 138 | + print(f" address: {addr}") |
| 139 | + except Exception as e: |
| 140 | + print(f" address: (error: {e})") |
| 141 | + |
| 142 | + # 3. Ask the resolver for the content hash (IPFS pointer) |
| 143 | + try: |
| 144 | + ch = decode_bytes(eth_call(resolver, selector("contenthash(bytes32)") + node_hex)) |
| 145 | + print(f" contenthash: {decode_contenthash(ch)}") |
| 146 | + except Exception as e: |
| 147 | + print(f" contenthash: (not supported: {e})") |
| 148 | + |
| 149 | + # 4. Owner from the registry |
| 150 | + try: |
| 151 | + owner = decode_address(eth_call(ENS_REGISTRY, selector("owner(bytes32)") + node_hex)) |
| 152 | + print(f" owner: {owner}") |
| 153 | + except Exception as e: |
| 154 | + print(f" owner: (error: {e})") |
| 155 | + |
| 156 | + # 5. Text records (EIP-634). Print only the non-empty ones. |
| 157 | + print(" text records:") |
| 158 | + for key in TEXT_KEYS: |
| 159 | + try: |
| 160 | + v = text(resolver, node, key) |
| 161 | + if v: |
| 162 | + print(f" {key:<16s} {v}") |
| 163 | + except Exception as e: |
| 164 | + print(f" {key:<16s} (error: {e})") |
| 165 | + |
| 166 | + |
| 167 | +if __name__ == "__main__": |
| 168 | + main() |
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