1#[cfg(all(feature = "client", feature = "http1"))]
2use bytes::BytesMut;
3use http::header::HeaderValue;
4#[cfg(all(feature = "http2", feature = "client"))]
5use http::Method;
6#[cfg(any(feature = "client", all(feature = "server", feature = "http2")))]
7use http::{
8 header::{ValueIter, CONTENT_LENGTH},
9 HeaderMap,
10};
11
12#[cfg(feature = "http1")]
13pub(super) fn connection_keep_alive(value: &HeaderValue) -> bool {
14 connection_has(value, needle:"keep-alive")
15}
16
17#[cfg(feature = "http1")]
18pub(super) fn connection_close(value: &HeaderValue) -> bool {
19 connection_has(value, needle:"close")
20}
21
22#[cfg(feature = "http1")]
23fn connection_has(value: &HeaderValue, needle: &str) -> bool {
24 if let Ok(s: &str) = value.to_str() {
25 for val: &str in s.split(',') {
26 if val.trim().eq_ignore_ascii_case(needle) {
27 return true;
28 }
29 }
30 }
31 false
32}
33
34#[cfg(all(feature = "http1", feature = "server"))]
35pub(super) fn content_length_parse(value: &HeaderValue) -> Option<u64> {
36 from_digits(value.as_bytes())
37}
38
39#[cfg(any(feature = "client", all(feature = "server", feature = "http2")))]
40pub(super) fn content_length_parse_all(headers: &HeaderMap) -> Option<u64> {
41 content_length_parse_all_values(headers.get_all(CONTENT_LENGTH).into_iter())
42}
43
44#[cfg(any(feature = "client", all(feature = "server", feature = "http2")))]
45pub(super) fn content_length_parse_all_values(values: ValueIter<'_, HeaderValue>) -> Option<u64> {
46 // If multiple Content-Length headers were sent, everything can still
47 // be alright if they all contain the same value, and all parse
48 // correctly. If not, then it's an error.
49
50 let mut content_length: Option<u64> = None;
51 for h in values {
52 if let Ok(line) = h.to_str() {
53 for v in line.split(',') {
54 if let Some(n) = from_digits(v.trim().as_bytes()) {
55 if content_length.is_none() {
56 content_length = Some(n)
57 } else if content_length != Some(n) {
58 return None;
59 }
60 } else {
61 return None;
62 }
63 }
64 } else {
65 return None;
66 }
67 }
68
69 content_length
70}
71
72fn from_digits(bytes: &[u8]) -> Option<u64> {
73 // cannot use FromStr for u64, since it allows a signed prefix
74 let mut result = 0u64;
75 const RADIX: u64 = 10;
76
77 if bytes.is_empty() {
78 return None;
79 }
80
81 for &b in bytes {
82 // can't use char::to_digit, since we haven't verified these bytes
83 // are utf-8.
84 match b {
85 b'0'..=b'9' => {
86 result = result.checked_mul(RADIX)?;
87 result = result.checked_add((b - b'0') as u64)?;
88 }
89 _ => {
90 // not a DIGIT, get outta here!
91 return None;
92 }
93 }
94 }
95
96 Some(result)
97}
98
99#[cfg(all(feature = "http2", feature = "client"))]
100pub(super) fn method_has_defined_payload_semantics(method: &Method) -> bool {
101 !matches!(
102 *method,
103 Method::GET | Method::HEAD | Method::DELETE | Method::CONNECT
104 )
105}
106
107#[cfg(feature = "http2")]
108pub(super) fn set_content_length_if_missing(headers: &mut HeaderMap, len: u64) {
109 headers
110 .entry(CONTENT_LENGTH)
111 .or_insert_with(|| HeaderValue::from(len));
112}
113
114#[cfg(all(feature = "client", feature = "http1"))]
115pub(super) fn transfer_encoding_is_chunked(headers: &HeaderMap) -> bool {
116 is_chunked(encodings:headers.get_all(key:http::header::TRANSFER_ENCODING).into_iter())
117}
118
119#[cfg(all(feature = "client", feature = "http1"))]
120pub(super) fn is_chunked(mut encodings: ValueIter<'_, HeaderValue>) -> bool {
121 // chunked must always be the last encoding, according to spec
122 if let Some(line: &HeaderValue) = encodings.next_back() {
123 return is_chunked_(line);
124 }
125
126 false
127}
128
129#[cfg(feature = "http1")]
130pub(super) fn is_chunked_(value: &HeaderValue) -> bool {
131 // chunked must always be the last encoding, according to spec
132 if let Ok(s: &str) = value.to_str() {
133 if let Some(encoding: &str) = s.rsplit(',').next() {
134 return encoding.trim().eq_ignore_ascii_case("chunked");
135 }
136 }
137
138 false
139}
140
141#[cfg(all(feature = "client", feature = "http1"))]
142pub(super) fn add_chunked(mut entry: http::header::OccupiedEntry<'_, HeaderValue>) {
143 const CHUNKED: &str = "chunked";
144
145 if let Some(line: &mut HeaderValue) = entry.iter_mut().next_back() {
146 // + 2 for ", "
147 let new_cap: usize = line.as_bytes().len() + CHUNKED.len() + 2;
148 let mut buf: BytesMut = BytesMut::with_capacity(new_cap);
149 buf.extend_from_slice(extend:line.as_bytes());
150 buf.extend_from_slice(extend:b", ");
151 buf.extend_from_slice(CHUNKED.as_bytes());
152
153 *line = HeaderValue::from_maybe_shared(buf.freeze())
154 .expect(msg:"original header value plus ascii is valid");
155 return;
156 }
157
158 entry.insert(HeaderValue::from_static(CHUNKED));
159}
160