mirror of https://github.com/http-rs/http-types
104 lines
2.7 KiB
Rust
104 lines
2.7 KiB
Rust
use crate::headers::{Header, HeaderName, HeaderValue, Headers, CONTENT_LENGTH};
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use crate::Status;
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/// The size of the entity-body, in bytes, sent to the recipient.
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///
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/// # Specifications
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///
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/// - [RFC 7230, section 3.3.2: Content-Length](https://tools.ietf.org/html/rfc7230#section-3.3.2)
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///
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/// # Examples
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///
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/// ```
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/// # fn main() -> http_types::Result<()> {
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/// #
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/// use http_types::Response;
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/// use http_types::content::{ContentLength};
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///
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/// let content_len = ContentLength::new(12);
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///
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/// let mut res = Response::new(200);
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/// res.insert_header(&content_len, &content_len);
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///
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/// let content_len = ContentLength::from_headers(res)?.unwrap();
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/// assert_eq!(content_len.len(), 12);
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/// #
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/// # Ok(()) }
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/// ```
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#[derive(Debug)]
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pub struct ContentLength {
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length: u64,
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}
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#[allow(clippy::len_without_is_empty)]
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impl ContentLength {
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/// Create a new instance.
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pub fn new(length: u64) -> Self {
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Self { length }
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}
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/// Create a new instance from headers.
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pub fn from_headers(headers: impl AsRef<Headers>) -> crate::Result<Option<Self>> {
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let headers = match headers.as_ref().get(CONTENT_LENGTH) {
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Some(headers) => headers,
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None => return Ok(None),
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};
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// If we successfully parsed the header then there's always at least one
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// entry. We want the last entry.
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let value = headers.iter().last().unwrap();
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let length = value.as_str().trim().parse().status(400)?;
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Ok(Some(Self { length }))
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}
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/// Get the content length.
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pub fn len(&self) -> u64 {
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self.length
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}
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/// Set the content length.
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pub fn set_len(&mut self, len: u64) {
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self.length = len;
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}
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}
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impl Header for ContentLength {
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fn header_name(&self) -> HeaderName {
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CONTENT_LENGTH
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}
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fn header_value(&self) -> HeaderValue {
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let output = format!("{}", self.length);
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// SAFETY: the internal string is validated to be ASCII.
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unsafe { HeaderValue::from_bytes_unchecked(output.into()) }
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::headers::Headers;
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#[test]
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fn smoke() -> crate::Result<()> {
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let content_len = ContentLength::new(12);
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let mut headers = Headers::new();
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content_len.apply_header(&mut headers);
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let content_len = ContentLength::from_headers(headers)?.unwrap();
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assert_eq!(content_len.len(), 12);
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Ok(())
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}
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#[test]
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fn bad_request_on_parse_error() {
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let mut headers = Headers::new();
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headers
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.insert(CONTENT_LENGTH, "<nori ate the tag. yum.>")
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.unwrap();
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let err = ContentLength::from_headers(headers).unwrap_err();
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assert_eq!(err.status(), 400);
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}
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}
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