22 lines
540 B
Rust
22 lines
540 B
Rust
use hex;
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use serde::de::{self, Visitor};
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use std::fmt;
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pub struct HexVisitor;
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impl<'de> Visitor<'de> for HexVisitor {
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type Value = Vec<u8>;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a hex string (irrelevant of prefix)")
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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: de::Error,
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{
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Ok(hex::decode(value.trim_start_matches("0x"))
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.map_err(|e| de::Error::custom(format!("invalid hex ({:?})", e)))?)
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}
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}
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