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#[cfg(feature = "http1")]
use bytes::BytesMut;
use http::header::CONTENT_LENGTH;
use http::header::{HeaderValue, ValueIter};
use http::HeaderMap;
#[cfg(all(feature = "http2", feature = "client"))]
use http::Method;
#[cfg(feature = "http1")]
pub(super) fn connection_keep_alive(value: &HeaderValue) -> bool {
connection_has(value, "keep-alive")
}
#[cfg(feature = "http1")]
pub(super) fn connection_close(value: &HeaderValue) -> bool {
connection_has(value, "close")
}
#[cfg(feature = "http1")]
fn connection_has(value: &HeaderValue, needle: &str) -> bool {
if let Ok(s) = value.to_str() {
for val in s.split(',') {
if val.trim().eq_ignore_ascii_case(needle) {
return true;
}
}
}
false
}
#[cfg(all(feature = "http1", feature = "server"))]
pub(super) fn content_length_parse(value: &HeaderValue) -> Option<u64> {
from_digits(value.as_bytes())
}
pub(super) fn content_length_parse_all(headers: &HeaderMap) -> Option<u64> {
content_length_parse_all_values(headers.get_all(CONTENT_LENGTH).into_iter())
}
pub(super) fn content_length_parse_all_values(values: ValueIter<'_, HeaderValue>) -> Option<u64> {
// If multiple Content-Length headers were sent, everything can still
// be alright if they all contain the same value, and all parse
// correctly. If not, then it's an error.
let mut content_length: Option<u64> = None;
for h in values {
if let Ok(line) = h.to_str() {
for v in line.split(',') {
if let Some(n) = from_digits(v.trim().as_bytes()) {
if content_length.is_none() {
content_length = Some(n)
} else if content_length != Some(n) {
return None;
}
} else {
return None
}
}
} else {
return None
}
}
return content_length
}
fn from_digits(bytes: &[u8]) -> Option<u64> {
// cannot use FromStr for u64, since it allows a signed prefix
let mut result = 0u64;
const RADIX: u64 = 10;
if bytes.is_empty() {
return None;
}
for &b in bytes {
// can't use char::to_digit, since we haven't verified these bytes
// are utf-8.
match b {
b'0'..=b'9' => {
result = result.checked_mul(RADIX)?;
result = result.checked_add((b - b'0') as u64)?;
},
_ => {
// not a DIGIT, get outta here!
return None;
}
}
}
Some(result)
}
#[cfg(all(feature = "http2", feature = "client"))]
pub(super) fn method_has_defined_payload_semantics(method: &Method) -> bool {
match *method {
Method::GET | Method::HEAD | Method::DELETE | Method::CONNECT => false,
_ => true,
}
}
#[cfg(feature = "http2")]
pub(super) fn set_content_length_if_missing(headers: &mut HeaderMap, len: u64) {
headers
.entry(CONTENT_LENGTH)
.or_insert_with(|| HeaderValue::from(len));
}
#[cfg(feature = "http1")]
pub(super) fn transfer_encoding_is_chunked(headers: &HeaderMap) -> bool {
is_chunked(headers.get_all(http::header::TRANSFER_ENCODING).into_iter())
}
#[cfg(feature = "http1")]
pub(super) fn is_chunked(mut encodings: ValueIter<'_, HeaderValue>) -> bool {
// chunked must always be the last encoding, according to spec
if let Some(line) = encodings.next_back() {
return is_chunked_(line);
}
false
}
#[cfg(feature = "http1")]
pub(super) fn is_chunked_(value: &HeaderValue) -> bool {
// chunked must always be the last encoding, according to spec
if let Ok(s) = value.to_str() {
if let Some(encoding) = s.rsplit(',').next() {
return encoding.trim().eq_ignore_ascii_case("chunked");
}
}
false
}
#[cfg(feature = "http1")]
pub(super) fn add_chunked(mut entry: http::header::OccupiedEntry<'_, HeaderValue>) {
const CHUNKED: &str = "chunked";
if let Some(line) = entry.iter_mut().next_back() {
// + 2 for ", "
let new_cap = line.as_bytes().len() + CHUNKED.len() + 2;
let mut buf = BytesMut::with_capacity(new_cap);
buf.extend_from_slice(line.as_bytes());
buf.extend_from_slice(b", ");
buf.extend_from_slice(CHUNKED.as_bytes());
*line = HeaderValue::from_maybe_shared(buf.freeze())
.expect("original header value plus ascii is valid");
return;
}
entry.insert(HeaderValue::from_static(CHUNKED));
}