131 lines
3.4 KiB
Rust
131 lines
3.4 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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//! Lenient bytes json deserialization for test json files.
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use rustc_hex::FromHex;
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use serde::{
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de::{Error, Visitor},
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Deserialize, Deserializer,
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};
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use std::{fmt, ops::Deref, str::FromStr};
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/// Lenient bytes json deserialization for test json files.
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#[derive(Default, Debug, PartialEq, Eq, Clone, PartialOrd, Ord)]
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pub struct Bytes(pub Vec<u8>);
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impl Bytes {
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/// Creates bytes struct.
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pub fn new(v: Vec<u8>) -> Self {
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Bytes(v)
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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 Deref for Bytes {
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type Target = [u8];
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fn deref(&self) -> &[u8] {
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&self.0
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}
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}
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impl FromStr for Bytes {
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type Err = String;
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fn from_str(value: &str) -> Result<Self, Self::Err> {
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let v = match value.len() {
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0 => vec![],
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2 if value.starts_with("0x") => vec![],
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_ if value.starts_with("0x") && value.len() % 2 == 1 => {
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let v = "0".to_owned() + &value[2..];
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FromHex::from_hex(v.as_str()).unwrap_or(vec![])
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}
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_ if value.starts_with("0x") => FromHex::from_hex(&value[2..]).unwrap_or(vec![]),
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_ => FromHex::from_hex(value).unwrap_or(vec![]),
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};
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Ok(Bytes(v))
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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<Self, 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 hex encoded string 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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Bytes::from_str(value).map_err(Error::custom)
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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 test {
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use crate::bytes::Bytes;
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use serde_json;
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#[test]
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fn bytes_deserialization() {
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let s = r#"["", "0x", "0x12", "1234", "0x001"]"#;
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let deserialized: Vec<Bytes> = serde_json::from_str(s).unwrap();
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assert_eq!(
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deserialized,
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vec![
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Bytes(vec![]),
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Bytes(vec![]),
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Bytes(vec![0x12]),
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Bytes(vec![0x12, 0x34]),
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Bytes(vec![0, 1])
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]
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);
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}
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#[test]
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fn bytes_into() {
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let bytes = Bytes(vec![0xff, 0x11]);
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let v: Vec<u8> = bytes.into();
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assert_eq!(vec![0xff, 0x11], v);
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}
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}
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