use serde::de::{Deserializer, Error, Unexpected, Visitor};
use std::fmt;
struct FileVisitor;
impl<'de> Visitor<'de> for FileVisitor {
type Value = Vec<u8>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "a path to an existing file")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
use std::fs::File;
use std::io::Read;
let mut data = Vec::new();
File::open(v)
.and_then(|mut file| file.read_to_end(&mut data).map(|_| data))
.map_err(|_| Error::invalid_value(Unexpected::Str(v), &self))
}
}
pub fn file<'de, D>(deserializer: D) -> Result<Vec<u8>, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(FileVisitor)
}
#[cfg(feature = "jose")]
pub use crate::jose::serde::algorithm;