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use std::borrow::Cow;
use thiserror::Error;
#[derive(Debug, Error, Clone)]
#[non_exhaustive]
pub enum HttpRequestError {
#[error("couldn't convert http header value to string for header key {key}")]
HeaderValueToStr { key: String },
#[error("unexpected error: {reason}")]
Unexpected { reason: String },
}
pub trait HttpRequest {
fn get_header_concatenated_values<'a>(&'a self, header_name: &str) -> Result<Cow<'a, str>, HttpRequestError>;
fn get_lowercased_method(&self) -> Result<Cow<'_, str>, HttpRequestError>;
fn get_target(&self) -> Result<Cow<'_, str>, HttpRequestError>;
}
#[cfg(feature = "http_trait_impl")]
mod http_trait_impl {
use super::*;
impl HttpRequest for http::request::Parts {
fn get_header_concatenated_values<'a>(&'a self, header_name: &str) -> Result<Cow<'a, str>, HttpRequestError> {
let mut values = Vec::new();
let all_values = self.headers.get_all(header_name);
for value in all_values {
let value_str = value.to_str().map_err(|_| HttpRequestError::HeaderValueToStr {
key: header_name.to_owned(),
})?;
values.push(value_str.trim());
}
Ok(Cow::Owned(values.join(", ")))
}
fn get_lowercased_method(&self) -> Result<Cow<'_, str>, HttpRequestError> {
Ok(Cow::Owned(self.method.as_str().to_lowercase()))
}
fn get_target(&self) -> Result<Cow<'_, str>, HttpRequestError> {
Ok(Cow::Borrowed(self.uri.path()))
}
}
impl<T> HttpRequest for http::request::Request<T> {
fn get_header_concatenated_values<'a>(&'a self, header_name: &str) -> Result<Cow<'a, str>, HttpRequestError> {
let mut values = Vec::new();
let all_values = self.headers().get_all(header_name);
for value in all_values {
let value_str = value.to_str().map_err(|_| HttpRequestError::HeaderValueToStr {
key: header_name.to_owned(),
})?;
values.push(value_str.trim());
}
Ok(Cow::Owned(values.join(", ")))
}
fn get_lowercased_method(&self) -> Result<Cow<'_, str>, HttpRequestError> {
Ok(Cow::Owned(self.method().as_str().to_lowercase()))
}
fn get_target(&self) -> Result<Cow<'_, str>, HttpRequestError> {
Ok(Cow::Borrowed(self.uri().path()))
}
}
#[cfg(test)]
mod tests {
use super::*;
use http::{header, method::Method, request};
#[test]
fn http_request_parts() {
let req = request::Builder::new()
.method(Method::GET)
.uri("/foo")
.header("Host", "example.org")
.header(header::DATE, "Tue, 07 Jun 2014 20:51:35 GMT")
.header("X-Example", " Example header with some whitespace. ")
.header("X-EmptyHeader", "")
.header(header::CACHE_CONTROL, "max-age=60")
.header(header::CACHE_CONTROL, "must-revalidate")
.body(())
.expect("couldn't build request");
let (parts, _) = req.into_parts();
assert_eq!(parts.get_target().expect("target"), "/foo");
assert_eq!(parts.get_lowercased_method().expect("method"), "get");
assert_eq!(
parts.get_header_concatenated_values("host").expect("host"),
"example.org"
);
assert_eq!(
parts.get_header_concatenated_values("date").expect("date"),
"Tue, 07 Jun 2014 20:51:35 GMT"
);
assert_eq!(
parts.get_header_concatenated_values("x-example").expect("example"),
"Example header with some whitespace."
);
assert_eq!(
parts.get_header_concatenated_values("X-EmptyHeader").expect("empty"),
""
);
assert_eq!(
parts
.get_header_concatenated_values(header::CACHE_CONTROL.as_str())
.expect("cache control"),
"max-age=60, must-revalidate"
);
}
#[test]
fn http_request_request() {
let req = request::Builder::new()
.method(Method::GET)
.uri("/foo")
.header("Host", "example.org")
.header(header::DATE, "Tue, 07 Jun 2014 20:51:35 GMT")
.header("X-Example", " Example header with some whitespace. ")
.header("X-EmptyHeader", "")
.header(header::CACHE_CONTROL, "max-age=60")
.header(header::CACHE_CONTROL, "must-revalidate")
.body(())
.expect("couldn't build request");
assert_eq!(req.get_target().expect("target"), "/foo");
assert_eq!(req.get_lowercased_method().expect("method"), "get");
assert_eq!(req.get_header_concatenated_values("host").expect("host"), "example.org");
assert_eq!(
req.get_header_concatenated_values("date").expect("date"),
"Tue, 07 Jun 2014 20:51:35 GMT"
);
assert_eq!(
req.get_header_concatenated_values("x-example").expect("example"),
"Example header with some whitespace."
);
assert_eq!(req.get_header_concatenated_values("X-EmptyHeader").expect("empty"), "");
assert_eq!(
req.get_header_concatenated_values(header::CACHE_CONTROL.as_str())
.expect("cache control"),
"max-age=60, must-revalidate"
);
}
}
}