nano-web 1.4.2

Static file server built with Rust with pre-compressed in-memory caching
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use bytes::Bytes;
use std::sync::Arc;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Encoding {
    Identity,
    Gzip,
    Brotli,
    Zstd,
}

impl Encoding {
    pub const ALL: [Self; 4] = [Self::Identity, Self::Gzip, Self::Brotli, Self::Zstd];

    /// Parse Accept-Encoding header, priority: br > zstd > gzip > identity.
    /// Splits on comma to avoid substring false positives (e.g. "br" matching "vibrant").
    /// Respects q=0 (encoding explicitly rejected by client).
    pub fn from_accept_encoding(accept: &str) -> Self {
        let mut best = Self::Identity;
        for part in accept.split(',') {
            let mut segments = part.split(';');
            let token = segments.next().unwrap_or("").trim();

            // q=0 means the encoding is explicitly rejected
            let rejected = segments.any(|s| {
                s.trim()
                    .strip_prefix("q=")
                    .and_then(|v| v.trim().parse::<f32>().ok())
                    .is_some_and(|q| q == 0.0)
            });
            if rejected {
                continue;
            }

            match token {
                "br" => return Self::Brotli, // highest priority, short-circuit
                "zstd" => best = Self::Zstd,
                "gzip" if !matches!(best, Self::Zstd) => best = Self::Gzip,
                _ => {}
            }
        }
        best
    }
}

#[derive(Debug, Clone)]
pub struct ResponseBuffer {
    pub body: Bytes,
    pub content_type: Arc<str>,
    pub content_encoding: Option<&'static str>,
    pub etag: Arc<str>,
    pub last_modified: Arc<str>,
    pub cache_control: Arc<str>,
    pub content_length: Arc<str>,
    /// Whether Vary: Accept-Encoding should be sent (true for all compressible types)
    pub vary_encoding: bool,
}

impl ResponseBuffer {
    pub fn new(
        body: Bytes,
        content_type: Arc<str>,
        content_encoding: Option<&'static str>,
        etag: Arc<str>,
        last_modified: Arc<str>,
        cache_control: Arc<str>,
        vary_encoding: bool,
    ) -> Self {
        let content_length: Arc<str> = Arc::from(body.len().to_string().as_str());
        Self {
            body,
            content_type,
            content_encoding,
            etag,
            last_modified,
            cache_control,
            content_length,
            vary_encoding,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_encoding_priority() {
        assert_eq!(
            Encoding::from_accept_encoding("gzip, br, zstd"),
            Encoding::Brotli
        );
        assert_eq!(Encoding::from_accept_encoding("br"), Encoding::Brotli);
        assert_eq!(Encoding::from_accept_encoding("gzip, zstd"), Encoding::Zstd);
        assert_eq!(Encoding::from_accept_encoding("zstd"), Encoding::Zstd);
        assert_eq!(Encoding::from_accept_encoding("gzip"), Encoding::Gzip);
        assert_eq!(
            Encoding::from_accept_encoding("deflate"),
            Encoding::Identity
        );
        assert_eq!(Encoding::from_accept_encoding(""), Encoding::Identity);
    }

    #[test]
    fn test_encoding_no_substring_false_positives() {
        assert_eq!(
            Encoding::from_accept_encoding("vibrant"),
            Encoding::Identity
        );
        assert_eq!(Encoding::from_accept_encoding("broken"), Encoding::Identity);
    }

    #[test]
    fn test_encoding_with_quality_values() {
        assert_eq!(
            Encoding::from_accept_encoding("gzip;q=1.0, br;q=0.8"),
            Encoding::Brotli
        );
        assert_eq!(
            Encoding::from_accept_encoding("gzip;q=0.5, zstd;q=1.0"),
            Encoding::Zstd
        );
    }

    #[test]
    fn test_encoding_respects_q_zero() {
        // q=0 means explicitly rejected
        assert_eq!(
            Encoding::from_accept_encoding("br;q=0, gzip"),
            Encoding::Gzip
        );
        assert_eq!(
            Encoding::from_accept_encoding("br;q=0, zstd;q=0, gzip"),
            Encoding::Gzip
        );
        assert_eq!(
            Encoding::from_accept_encoding("br;q=0, zstd;q=0, gzip;q=0"),
            Encoding::Identity
        );
        assert_eq!(
            Encoding::from_accept_encoding("gzip;q=0"),
            Encoding::Identity
        );
    }
}