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// Copyright 2018-2022 Parity Technologies (UK) Ltd.
// This file is part of cargo-contract.
//
// cargo-contract is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// cargo-contract is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with cargo-contract. If not, see <http://www.gnu.org/licenses/>.
use impl_serde::serialize as serde_hex;
/// Serializes the given bytes as byte string.
pub fn serialize_as_byte_str<S>(bytes: &[u8], serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
if bytes.is_empty() {
// Return empty string without prepended `0x`.
return serializer.serialize_str("")
}
serde_hex::serialize(bytes, serializer)
}
/// Deserializes the given hex string with optional `0x` prefix.
pub fn deserialize_from_byte_str<'de, D>(deserializer: D) -> Result<Vec<u8>, D::Error>
where
D: serde::Deserializer<'de>,
{
struct Visitor;
impl<'b> serde::de::Visitor<'b> for Visitor {
type Value = Vec<u8>;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(formatter, "hex string with optional 0x prefix")
}
fn visit_str<E: serde::de::Error>(self, v: &str) -> Result<Self::Value, E> {
let result = from_hex(v);
result.map_err(E::custom)
}
fn visit_string<E: serde::de::Error>(self, v: String) -> Result<Self::Value, E> {
self.visit_str(&v)
}
}
deserializer.deserialize_str(Visitor)
}
/// Deserializes the given hex string with optional `0x` prefix.
pub fn deserialize_from_byte_str_array<'de, D>(
deserializer: D,
) -> Result<[u8; 32], D::Error>
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where
D: serde::Deserializer<'de>,
{
struct Visitor;
impl<'b> serde::de::Visitor<'b> for Visitor {
type Value = [u8; 32];
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(formatter, "hex string with optional 0x prefix")
}
fn visit_str<E: serde::de::Error>(self, v: &str) -> Result<Self::Value, E> {
let result = from_hex(v).map_err(E::custom)?;
if result.len() != 32 {
Err(E::custom("Expected exactly 32 bytes"))
} else {
let mut arr = [0u8; 32];
arr.copy_from_slice(&result[..]);
Ok(arr)
}
}
fn visit_string<E: serde::de::Error>(self, v: String) -> Result<Self::Value, E> {
self.visit_str(&v)
}
}
deserializer.deserialize_str(Visitor)
}
fn from_hex(v: &str) -> Result<Vec<u8>, serde_hex::FromHexError> {
if v.starts_with("0x") {
serde_hex::from_hex(v)
} else {
serde_hex::from_hex(&format!("0x{}", v))
}
}