145 lines
4.1 KiB
Rust
145 lines
4.1 KiB
Rust
use std::fmt::Write;
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use bytes::BytesMut;
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use http::HeaderMap;
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use http::header::{CONTENT_LENGTH, TRANSFER_ENCODING};
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use http::header::{HeaderValue, OccupiedEntry, ValueIter};
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/// Maximum number of bytes needed to serialize a u64 into ASCII decimal.
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const MAX_DECIMAL_U64_BYTES: usize = 20;
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pub fn connection_keep_alive(value: &HeaderValue) -> bool {
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connection_has(value, "keep-alive")
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}
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pub fn connection_close(value: &HeaderValue) -> bool {
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connection_has(value, "close")
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}
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fn connection_has(value: &HeaderValue, needle: &str) -> bool {
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if let Ok(s) = value.to_str() {
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for val in s.split(',') {
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if eq_ascii(val.trim(), needle) {
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return true;
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}
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}
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}
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false
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}
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pub fn content_length_parse(value: &HeaderValue) -> Option<u64> {
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value
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.to_str()
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.ok()
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.and_then(|s| s.parse().ok())
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}
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pub fn content_length_parse_all(headers: &HeaderMap) -> Option<u64> {
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content_length_parse_all_values(headers.get_all(CONTENT_LENGTH).into_iter())
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}
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pub fn content_length_parse_all_values(values: ValueIter<HeaderValue>) -> Option<u64> {
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// If multiple Content-Length headers were sent, everything can still
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// be alright if they all contain the same value, and all parse
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// correctly. If not, then it's an error.
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let folded = values
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.fold(None, |prev, line| match prev {
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Some(Ok(prev)) => {
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Some(line
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.to_str()
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.map_err(|_| ())
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.and_then(|s| s.parse().map_err(|_| ()))
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.and_then(|n| if prev == n { Ok(n) } else { Err(()) }))
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},
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None => {
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Some(line
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.to_str()
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.map_err(|_| ())
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.and_then(|s| s.parse().map_err(|_| ())))
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},
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Some(Err(())) => Some(Err(())),
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});
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if let Some(Ok(n)) = folded {
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Some(n)
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} else {
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None
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}
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}
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pub fn content_length_value(len: u64) -> HeaderValue {
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let mut len_buf = BytesMut::with_capacity(MAX_DECIMAL_U64_BYTES);
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write!(len_buf, "{}", len)
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.expect("BytesMut can hold a decimal u64");
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// safe because u64 Display is ascii numerals
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unsafe {
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HeaderValue::from_shared_unchecked(len_buf.freeze())
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}
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}
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pub fn transfer_encoding_is_chunked(headers: &HeaderMap) -> bool {
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is_chunked(headers.get_all(TRANSFER_ENCODING).into_iter())
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}
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pub fn is_chunked(mut encodings: ValueIter<HeaderValue>) -> bool {
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// chunked must always be the last encoding, according to spec
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if let Some(line) = encodings.next_back() {
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return is_chunked_(line);
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}
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false
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}
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pub fn is_chunked_(value: &HeaderValue) -> bool {
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// chunked must always be the last encoding, according to spec
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if let Ok(s) = value.to_str() {
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if let Some(encoding) = s.rsplit(',').next() {
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return eq_ascii(encoding.trim(), "chunked");
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}
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}
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false
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}
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pub fn add_chunked(mut entry: OccupiedEntry<HeaderValue>) {
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const CHUNKED: &'static str = "chunked";
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if let Some(line) = entry.iter_mut().next_back() {
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// + 2 for ", "
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let new_cap = line.as_bytes().len() + CHUNKED.len() + 2;
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let mut buf = BytesMut::with_capacity(new_cap);
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buf.copy_from_slice(line.as_bytes());
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buf.copy_from_slice(b", ");
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buf.copy_from_slice(CHUNKED.as_bytes());
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*line = HeaderValue::from_shared(buf.freeze())
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.expect("original header value plus ascii is valid");
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return;
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}
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entry.insert(HeaderValue::from_static(CHUNKED));
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}
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fn eq_ascii(left: &str, right: &str) -> bool {
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// As of Rust 1.23, str gained this method inherently, and so the
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// compiler says this trait is unused.
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//
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// TODO: Once our minimum Rust compiler version is >=1.23, this can be removed.
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#[allow(unused, deprecated)]
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use std::ascii::AsciiExt;
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left.eq_ignore_ascii_case(right)
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn assert_max_decimal_u64_bytes() {
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assert_eq!(
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super::MAX_DECIMAL_U64_BYTES,
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::std::u64::MAX.to_string().len()
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);
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}
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}
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