emerald-vault-core 0.26.6

/*
Copyright 2019 ETCDEV GmbH

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
//! # JSON serialize format for hex encoded account addresses (without '0x' prefix)

use super::core::Address;
use regex::Regex;
use serde::de;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::str::FromStr;

impl<'de> Deserialize<'de> for Address {
    fn deserialize<D>(deserializer: D) -> Result<Address, D::Error>
    where
        D: Deserializer<'de>,
    {
        String::deserialize(deserializer)
            .map(|s| format!("0x{}", s))
            .and_then(|s| Address::from_str(&s).map_err(de::Error::custom))
    }
}

impl Serialize for Address {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&self.to_string()[2..]) /* cut '0x' prefix */
    }
}

/// Try to extract `Address` from JSON formatted text
pub fn try_extract_address(text: &str) -> Option<Address> {
    lazy_static! {
        static ref ADDR_RE: Regex = Regex::new(r#"address.+?([a-fA-F0-9]{40})"#).unwrap();
    }

    ADDR_RE
        .captures(text)
        .and_then(|g| g.get(1).map(|m| format!("0x{}", m.as_str())))
        .and_then(|s| s.parse().ok())
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::tests::*;

    #[test]
    fn should_encode_default_address() {
        assert_eq!(
            serde_json::to_string(&Address::default()).unwrap(),
            "\"0000000000000000000000000000000000000000\""
        );
    }

    #[test]
    fn should_decode_zero_address() {
        assert_eq!(
            serde_json::from_str::<Address>("\"0000000000000000000000000000000000000000\"")
                .unwrap(),
            Address::default()
        );
    }

    #[test]
    fn should_encode_real_address() {
        let addr = Address([
            0x0e, 0x7c, 0x04, 0x51, 0x10, 0xb8, 0xdb, 0xf2, 0x97, 0x65, 0x04, 0x73, 0x80, 0x89,
            0x89, 0x19, 0xc5, 0xcb, 0x56, 0xf4,
        ]);

        assert_eq!(
            serde_json::to_string(&addr).unwrap(),
            "\"0e7c045110b8dbf29765047380898919c5cb56f4\""
        );
    }

    #[test]
    fn should_decode_real_address() {
        let addr = Address([
            0x0e, 0x7c, 0x04, 0x51, 0x10, 0xb8, 0xdb, 0xf2, 0x97, 0x65, 0x04, 0x73, 0x80, 0x89,
            0x89, 0x19, 0xc5, 0xcb, 0x56, 0xf4,
        ]);

        assert_eq!(
            serde_json::from_str::<Address>("\"0e7c045110b8dbf29765047380898919c5cb56f4\"")
                .unwrap(),
            addr
        );
    }

    #[test]
    fn should_not_decode_wrong_address() {
        assert!(
            serde_json::from_str::<Address>("\"__7c045110b8dbf29765047380898919c5cb56f4\"")
                .is_err()
        );
    }

    #[test]
    fn should_not_decode_not_string_address() {
        assert!(serde_json::from_str::<Address>("1234567890").is_err());
    }

    #[test]
    fn should_not_decode_empty_address() {
        assert!(serde_json::from_str::<Address>("\"\"").is_err());
    }

    #[test]
    fn should_not_decode_absent_address() {
        assert!(serde_json::from_str::<Address>("").is_err());
    }

    #[test]
    fn should_extract_address_single_quoted() {
        assert_eq!(
            try_extract_address(r#"address: '008aeeda4d805471df9b2a5b0f38a0c3bcba786b',"#),
            Some(
                "0x008aeeda4d805471df9b2a5b0f38a0c3bcba786b"
                    .parse::<Address>()
                    .unwrap(),
            )
        );
    }

    #[test]
    fn should_extract_address_double_quoted() {
        assert_eq!(
            try_extract_address(r#""address": "0047201aed0b69875b24b614dda0270bcd9f11cc","#),
            Some(
                "0x0047201aed0b69875b24b614dda0270bcd9f11cc"
                    .parse::<Address>()
                    .unwrap(),
            )
        );
    }

    #[test]
    fn should_extract_address_with_optional_fields() {
        assert_eq!(
            try_extract_address(
                r#"  },
                     "address": "3f4e0668c20e100d7c2a27d4b177ac65b2875d26",
                     "meta": "{}",
                     "name": "83c175d2ef1229ab10eb6726500a4303ab729e6e44dfaac274fe75c870b23a63",
                   }"#,
            ),
            Some(
                "0x3f4e0668c20e100d7c2a27d4b177ac65b2875d26"
                    .parse::<Address>()
                    .unwrap(),
            )
        );
    }

    #[test]
    fn should_ignore_text_without_address() {
        assert_eq!(try_extract_address("\"version\": 3"), None);
    }

    #[test]
    fn should_ignore_empty_text() {
        assert_eq!(try_extract_address(""), None);
    }
}