eip_712_utils 0.1.0

A Rust library providing utilities for EIP-712 message signing
Documentation 
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use crate::eip712::EIP712;
use crate::encode::hash_structured_data;
use rustc_hex::ToHex;
use serde_json::from_str;

pub fn create_domain(
    name: &str,
    version: &str,
    chain_id: &str,
    verifying_contract: &str,
) -> String {
    format!(
        r#"{{
        "name": "{}",
        "version": "{}",
        "chainId": "{}",
        "verifyingContract": "{}"
    }}"#,
        name, version, chain_id, verifying_contract
    )
}

pub fn create_message(token_id: &str, amount: &str, to: &str, nonce: &str) -> String {
    format!(
        r#"{{
        "tokenId": "{}",
        "amount": "{}",
        "to": "{}",
        "nonce": "{}"
    }}"#,
        token_id, amount, to, nonce
    )
}

pub fn generate_eip712_json_string(domain: &str, message: &str) -> String {
    let json = format!(
        r#"{{
        "primaryType": "NFTData",
        "domain": {},
        "message": {},
        "types": {{
            "EIP712Domain": [
                {{ "name": "name", "type": "string" }},
                {{ "name": "version", "type": "string" }},
                {{ "name": "chainId", "type": "uint256" }},
                {{ "name": "verifyingContract", "type": "address" }}
            ],
            "NFTData": [
                {{ "name": "tokenId", "type": "uint256" }},
                {{ "name": "amount", "type": "uint256" }},
                {{ "name": "to", "type": "address" }},
                {{ "name": "nonce", "type": "uint256" }}
            ]
        }}
    }}"#,
        domain, message
    );

    json
}

pub fn hash_structured_data_string(json: String) -> String {
    let typed_data = from_str::<EIP712>(&json).unwrap();
    let result = hash_structured_data(typed_data).unwrap().to_hex::<String>();
    result
}

#[cfg(test)]
mod tests {

    use crate::FieldType;

    use super::*;
    use rustc_hex::ToHex;
    use serde_json::json;

    #[test]
    fn it_creates_json_string() {
        let name = "AionRisingNFTs";
        let version = "0.0.1";
        let chain_id = "0x7A69";
        let verifying_contract = "0x037eDa3aDB1198021A9b2e88C22B464fD38db3f3";
        let token_id = "0x1";
        let amount = "0x1";
        let to = "0x7FA9385bE102ac3EAc297483Dd6233D62b3e1496";
        let nonce = "0x1";

        let domain_string = create_domain(name, version, chain_id, verifying_contract);
        let message_string = create_message(token_id, amount, to, nonce);
        let json = generate_eip712_json_string(&domain_string, &message_string);

        let expected_json = r#"{
            "primaryType": "NFTData",
            "domain": {
                "name": "AionRisingNFTs",
                "version": "0.0.1",
                "chainId": "0x7A69",
                "verifyingContract": "0x037eDa3aDB1198021A9b2e88C22B464fD38db3f3"
            },
            "message": {
                "tokenId": "0x1",
                "amount": "0x1",
                "to": "0x7FA9385bE102ac3EAc297483Dd6233D62b3e1496",
                "nonce": "0x1"
            },
            "types": {
                "EIP712Domain": [
                    { "name": "name", "type": "string" },
                    { "name": "version", "type": "string" },
                    { "name": "chainId", "type": "uint256" },
                    { "name": "verifyingContract", "type": "address" }
                ],
                "NFTData": [
                    { "name": "tokenId", "type": "uint256" },
                    { "name": "amount", "type": "uint256" },
                    { "name": "to", "type": "address" },
                    { "name": "nonce", "type": "uint256" }
                ]
            }
        }"#;

        let v1: serde_json::Value = from_str(&json).unwrap();
        let v2: serde_json::Value = from_str(&expected_json).unwrap();
        assert_eq!(v1, v2);
    }

    #[test]
    fn it_hashes_data_correctly() {
        let name = "AionRisingNFTs";
        let version = "0.0.1";
        let chain_id = "0x7A69";
        let verifying_contract = "0x037eDa3aDB1198021A9b2e88C22B464fD38db3f3";
        let token_id = "0x1";
        let amount = "0x1";
        let to = "0x7FA9385bE102ac3EAc297483Dd6233D62b3e1496";
        let nonce = "0x1";

        let custom_fields = vec![
            FieldType {
                name: "tokenId".to_string(),
                type_: "uint256".to_string(),
            },
            FieldType {
                name: "amount".to_string(),
                type_: "uint256".to_string(),
            },
            FieldType {
                name: "to".to_string(),
                type_: "address".to_string(),
            },
            FieldType {
                name: "nonce".to_string(),
                type_: "uint256".to_string(),
            },
        ];

        let data: EIP712 = EIP712::builder()
            .domain(name, version, chain_id, verifying_contract)
            .custom_field(("NFTData".to_string(), custom_fields))
            .message(json!({
                "tokenId": token_id,
                "amount": amount,
                "to": to,
                "nonce": nonce
            }))
            .build();

        let result = hash_structured_data(data).unwrap().to_hex::<String>();
        assert_eq!(
            result,
            "77915d20c811f39572463a234db9b776d518d07d9682a825be0d79752745a4c7"
        );
    }
}