pro_metadata/
utils.rs

1// Copyright 2018-2021 Parity Technologies (UK) Ltd.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use crate::serde_hex;
16
17/// Serializes the given bytes as byte string.
18pub fn serialize_as_byte_str<S>(bytes: &[u8], serializer: S) -> Result<S::Ok, S::Error>
19where
20    S: serde::Serializer,
21{
22    if bytes.is_empty() {
23        // Return empty string without prepended `0x`.
24        return serializer.serialize_str("")
25    }
26    serde_hex::serialize(bytes, serializer)
27}
28
29/// Deserializes the given hex string with optional `0x` prefix.
30pub fn deserialize_from_byte_str<'de, D>(deserializer: D) -> Result<Vec<u8>, D::Error>
31where
32    D: serde::Deserializer<'de>,
33{
34    struct Visitor;
35
36    impl<'b> serde::de::Visitor<'b> for Visitor {
37        type Value = Vec<u8>;
38
39        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
40            write!(formatter, "hex string with optional 0x prefix")
41        }
42
43        fn visit_str<E: serde::de::Error>(self, v: &str) -> Result<Self::Value, E> {
44            let result = if v.starts_with("0x") {
45                serde_hex::from_hex(v)
46            } else {
47                serde_hex::from_hex(&format!("0x{}", v))
48            };
49            result.map_err(E::custom)
50        }
51
52        fn visit_string<E: serde::de::Error>(self, v: String) -> Result<Self::Value, E> {
53            self.visit_str(&v)
54        }
55    }
56
57    deserializer.deserialize_str(Visitor)
58}
pro_metadata/utils.rs

pro_metadata/
utils.rs
