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use crate::headers::{HeaderName, HeaderValue, Headers, CONTENT_LENGTH};
use crate::Status;
#[derive(Debug)]
pub struct ContentLength {
length: u64,
}
#[allow(clippy::len_without_is_empty)]
impl ContentLength {
pub fn new(length: u64) -> Self {
Self { length }
}
pub fn from_headers(headers: impl AsRef<Headers>) -> crate::Result<Option<Self>> {
let headers = match headers.as_ref().get(CONTENT_LENGTH) {
Some(headers) => headers,
None => return Ok(None),
};
let value = headers.iter().last().unwrap();
let length = value.as_str().trim().parse().status(400)?;
Ok(Some(Self { length }))
}
pub fn apply(&self, mut headers: impl AsMut<Headers>) {
headers.as_mut().insert(self.name(), self.value());
}
pub fn name(&self) -> HeaderName {
CONTENT_LENGTH
}
pub fn value(&self) -> HeaderValue {
let output = format!("{}", self.length);
unsafe { HeaderValue::from_bytes_unchecked(output.into()) }
}
pub fn len(&self) -> u64 {
self.length
}
pub fn set_len(&mut self, len: u64) {
self.length = len;
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::headers::Headers;
#[test]
fn smoke() -> crate::Result<()> {
let content_len = ContentLength::new(12);
let mut headers = Headers::new();
content_len.apply(&mut headers);
let content_len = ContentLength::from_headers(headers)?.unwrap();
assert_eq!(content_len.len(), 12);
Ok(())
}
#[test]
fn bad_request_on_parse_error() -> crate::Result<()> {
let mut headers = Headers::new();
headers.insert(CONTENT_LENGTH, "<nori ate the tag. yum.>");
let err = ContentLength::from_headers(headers).unwrap_err();
assert_eq!(err.status(), 400);
Ok(())
}
}