icp_eth/
lib.rs

1use std::{rc::Rc, str::FromStr};
2
3use eth_rpc::call_contract;
4use ethers_core::{
5    abi::{Contract, Token},
6    types::{Address, RecoveryMessage, Signature},
7};
8use util::to_hex;
9
10mod eth_rpc;
11mod util;
12
13// Load relevant ABIs (Ethereum equivalent of Candid interfaces)
14thread_local! {
15    static ERC_721: Rc<Contract> = Rc::new(include_abi!("../abi/erc721.json"));
16    static ERC_1155: Rc<Contract> = Rc::new(include_abi!("../abi/erc1155.json"));
17}
18
19#[cfg(feature = "canpack")]
20canpack::export! {
21    /// Verify an ECDSA signature (message signed by an Ethereum wallet).
22    #[canpack(update)]
23    pub fn ecdsa_verify(eth_address: String, message: String, signature: String) -> bool {
24        Signature::from_str(&signature)
25            .unwrap()
26            .verify(
27                RecoveryMessage::Data(message.into_bytes()),
28                Address::from_str(&eth_address).unwrap(),
29            )
30            .is_ok()
31    }
32
33    /// Find the owner of an ERC-721 NFT by calling the Ethereum blockchain.
34    #[canpack(update)]
35    pub async fn erc721_owner_of(network: String, contract_address: String, token_id: u64) -> String {
36        // TODO: access control
37        // TODO: cycles estimation for HTTP outcalls
38
39        let abi = &ERC_721.with(Rc::clone);
40        let result = call_contract(
41            &network,
42            contract_address,
43            abi,
44            "ownerOf",
45            &[Token::Uint(token_id.into())],
46        )
47        .await;
48        match result.get(0) {
49            Some(Token::Address(a)) => to_hex(a.as_bytes()),
50            _ => panic!("Unexpected result"),
51        }
52    }
53
54    /// Find the balance of an ERC-1155 token by calling the Ethereum blockchain.
55    #[canpack(update)]
56    pub async fn erc1155_balance_of(
57        network: String,
58        contract_address: String,
59        owner_address: String,
60        token_id: u64,
61    ) -> u128 {
62        let owner_address =
63            ethers_core::types::Address::from_str(&owner_address).expect("Invalid owner address");
64
65        let abi = &ERC_1155.with(Rc::clone);
66        let result = call_contract(
67            &network,
68            contract_address,
69            abi,
70            "balanceOf",
71            &[
72                Token::Address(owner_address.into()),
73                Token::Uint(token_id.into()),
74            ],
75        )
76        .await;
77        match result.get(0) {
78            Some(Token::Uint(n)) => n.as_u128(),
79            _ => panic!("Unexpected result"),
80        }
81    }
82}
icp_eth/lib.rs

icp_eth/
lib.rs
