138 lines
4.0 KiB
Rust
138 lines
4.0 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// OpenEthereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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//! Serializable wrapper around vector of bytes
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use rustc_hex::{FromHex, ToHex};
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use serde::{
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de::{Error, Visitor},
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Deserialize, Deserializer, Serialize, Serializer,
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};
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use std::fmt;
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/// Wrapper structure around vector of bytes.
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#[derive(Debug, PartialEq, Eq, Default, Hash, Clone)]
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pub struct Bytes(pub Vec<u8>);
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impl Bytes {
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/// Simple constructor.
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pub fn new(bytes: Vec<u8>) -> Bytes {
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Bytes(bytes)
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}
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/// Convert back to vector
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pub fn into_vec(self) -> Vec<u8> {
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self.0
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}
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}
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impl From<Vec<u8>> for Bytes {
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fn from(bytes: Vec<u8>) -> Bytes {
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Bytes(bytes)
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}
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}
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impl Into<Vec<u8>> for Bytes {
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fn into(self) -> Vec<u8> {
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self.0
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}
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}
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impl Serialize for Bytes {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let mut serialized = "0x".to_owned();
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serialized.push_str(self.0.to_hex().as_ref());
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serializer.serialize_str(serialized.as_ref())
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}
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}
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impl<'a> Deserialize<'a> for Bytes {
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fn deserialize<D>(deserializer: D) -> Result<Bytes, D::Error>
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where
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D: Deserializer<'a>,
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{
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deserializer.deserialize_any(BytesVisitor)
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}
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}
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struct BytesVisitor;
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impl<'a> Visitor<'a> for BytesVisitor {
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type Value = Bytes;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "a 0x-prefixed, hex-encoded vector of bytes")
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}
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fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
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where
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E: Error,
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{
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if value.len() >= 2 && value.starts_with("0x") && value.len() & 1 == 0 {
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Ok(Bytes::new(FromHex::from_hex(&value[2..]).map_err(|e| {
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Error::custom(format!("Invalid hex: {}", e))
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})?))
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} else {
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Err(Error::custom(
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"Invalid bytes format. Expected a 0x-prefixed hex string with even length",
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))
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}
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}
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fn visit_string<E>(self, value: String) -> Result<Self::Value, E>
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where
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E: Error,
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{
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self.visit_str(value.as_ref())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use rustc_hex::FromHex;
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use serde_json;
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#[test]
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fn test_bytes_serialize() {
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let bytes = Bytes("0123456789abcdef".from_hex().unwrap());
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let serialized = serde_json::to_string(&bytes).unwrap();
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assert_eq!(serialized, r#""0x0123456789abcdef""#);
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}
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#[test]
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fn test_bytes_deserialize() {
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let bytes0: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""∀∂""#);
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let bytes1: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""""#);
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let bytes2: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""0x123""#);
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let bytes3: Result<Bytes, serde_json::Error> = serde_json::from_str(r#""0xgg""#);
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let bytes4: Bytes = serde_json::from_str(r#""0x""#).unwrap();
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let bytes5: Bytes = serde_json::from_str(r#""0x12""#).unwrap();
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let bytes6: Bytes = serde_json::from_str(r#""0x0123""#).unwrap();
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assert!(bytes0.is_err());
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assert!(bytes1.is_err());
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assert!(bytes2.is_err());
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assert!(bytes3.is_err());
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assert_eq!(bytes4, Bytes(vec![]));
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assert_eq!(bytes5, Bytes(vec![0x12]));
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assert_eq!(bytes6, Bytes(vec![0x1, 0x23]));
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}
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}
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