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use std::io::{Error as IoError, ErrorKind as IoErrorKind};
use http::{
header::{CONTENT_LENGTH, TRANSFER_ENCODING},
HeaderMap, HeaderValue, Version,
};
use crate::CHUNKED;
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum BodyFraming {
ContentLength(usize),
Chunked,
Neither,
}
impl BodyFraming {
pub fn update_content_length_value(&mut self, value: usize) -> Result<(), IoError> {
match self {
Self::ContentLength(n) => {
*n = value;
Ok(())
}
_ => Err(IoError::new(
IoErrorKind::InvalidInput,
"Not in ContentLength",
)),
}
}
}
pub trait BodyFramingDetector {
fn detect(&self) -> Result<BodyFraming, IoError>;
}
impl BodyFramingDetector for (&HeaderMap<HeaderValue>, &Version) {
fn detect(&self) -> Result<BodyFraming, IoError> {
let (headers, version) = *self;
if let Some(header_value) = headers.get(CONTENT_LENGTH) {
let value_str = header_value
.to_str()
.map_err(|err| IoError::new(IoErrorKind::InvalidInput, err))?;
let value: usize = value_str
.parse()
.map_err(|err| IoError::new(IoErrorKind::InvalidInput, err))?;
return Ok(BodyFraming::ContentLength(value));
}
if version == &Version::HTTP_11 {
if let Some(header_value) = headers.get(TRANSFER_ENCODING) {
if header_value == CHUNKED {
return Ok(BodyFraming::Chunked);
}
}
}
Ok(BodyFraming::Neither)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn detect() -> Result<(), Box<dyn std::error::Error>> {
let mut header_map = HeaderMap::new();
header_map.insert("Content-Length", "1".parse().unwrap());
assert_eq!(
(&header_map, &Version::HTTP_11).detect()?,
BodyFraming::ContentLength(1)
);
header_map.clear();
header_map.insert("Transfer-Encoding", "chunked".parse().unwrap());
assert_eq!(
(&header_map, &Version::HTTP_10).detect()?,
BodyFraming::Neither
);
assert_eq!(
(&header_map, &Version::HTTP_11).detect()?,
BodyFraming::Chunked
);
header_map.clear();
assert_eq!(
(&header_map, &Version::HTTP_11).detect()?,
BodyFraming::Neither
);
Ok(())
}
}