sark-core 0.2.2

the L7 layer for dope
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
146
147
148

use std::ops::ControlFlow;

use crate::error::{Error, Result};
use crate::http::codec::Header;
use crate::http::codec::header_utils::CsvScanMode;

#[derive(Clone, Copy)]
pub(super) struct TransferEncodingInfo {
    pub(super) has_transfer_encoding: bool,
    pub(super) is_chunked: bool,
}

#[derive(Clone, Copy, Debug, Default)]
pub struct HeaderScan {
    pub content_length: Option<usize>,
    pub has_transfer_encoding: bool,
    pub is_chunked_transfer: bool,
    pub has_expect: bool,
    pub expect_continue: bool,
    pub duplicate_content_length: bool,
    pub accept_encoding_gzip: bool,
}

impl crate::http::codec::Parse {
    pub(super) fn parse_transfer_encoding_value(value: &[u8]) -> Result<TransferEncodingInfo> {
        let mut saw_any = false;
        let mut saw_chunked = false;
        let mut last_is_chunked = false;
        let mut invalid_encoding = false;
        let mut invalid_ordering = false;

        Header::scan_csv_tokens(
            value,
            CsvScanMode::Strict,
            |token: &[u8]| -> ControlFlow<()> {
                if !token.is_ascii() {
                    invalid_encoding = true;
                    return ControlFlow::Break(());
                }
                saw_any = true;
                let is_chunked = token.eq_ignore_ascii_case(b"chunked");
                if saw_chunked && !last_is_chunked {
                    invalid_ordering = true;
                    return ControlFlow::Break(());
                }
                if saw_chunked && !is_chunked {
                    invalid_ordering = true;
                    return ControlFlow::Break(());
                }
                if is_chunked {
                    saw_chunked = true;
                }
                last_is_chunked = is_chunked;
                ControlFlow::Continue(())
            },
        )
        .and_then(|_| {
            if invalid_encoding {
                return Err(Error::BadRequest("Invalid Transfer-Encoding".into()));
            }
            if invalid_ordering {
                return Err(Error::BadRequest(
                    "Invalid Transfer-Encoding ordering".into(),
                ));
            }
            if saw_any {
                Ok(())
            } else {
                Err(Error::BadRequest("Invalid Transfer-Encoding".into()))
            }
        })?;
        if saw_chunked && !last_is_chunked {
            return Err(Error::BadRequest(
                "Invalid Transfer-Encoding ordering".into(),
            ));
        }

        Ok(TransferEncodingInfo {
            has_transfer_encoding: saw_any,
            is_chunked: saw_chunked && last_is_chunked,
        })
    }

    pub fn header_scan(headers: &[httparse::Header<'_>]) -> Result<HeaderScan> {
        let mut content_length: Option<usize> = None;
        let mut saw_content_length = false;
        let mut has_transfer_encoding = false;
        let mut is_chunked_transfer = false;
        let mut has_expect = false;
        let mut expect_continue = false;
        let mut duplicate_content_length = false;

        for h in headers.iter().filter(|h| !h.name.is_empty()) {
            if h.name.eq_ignore_ascii_case("content-length") {
                if saw_content_length {
                    duplicate_content_length = true;
                }
                saw_content_length = true;
                let len = Header::content_length(h.value)?;
                content_length = Some(len);
                continue;
            }

            if h.name.eq_ignore_ascii_case("transfer-encoding") {
                let te = Self::parse_transfer_encoding_value(h.value)?;
                has_transfer_encoding = has_transfer_encoding || te.has_transfer_encoding;
                if te.is_chunked {
                    is_chunked_transfer = true;
                }
                continue;
            }

            if h.name.eq_ignore_ascii_case("expect") {
                has_expect = true;
                if Header::trimmed_eq_ascii_case(h.value, b"100-continue") {
                    expect_continue = true;
                }
            }
        }

        Ok(HeaderScan {
            content_length,
            has_transfer_encoding,
            is_chunked_transfer,
            has_expect,
            expect_continue,
            duplicate_content_length,
            accept_encoding_gzip: false,
        })
    }

    pub fn content_length(headers: &[httparse::Header<'_>]) -> Result<Option<usize>> {
        for h in headers {
            if h.name.eq_ignore_ascii_case("content-length") {
                return Ok(Some(Header::content_length(h.value)?));
            }
        }
        Ok(None)
    }

    pub fn is_chunked(headers: &[httparse::Header<'_>]) -> bool {
        Header::has_name(headers, "transfer-encoding")
            && headers.iter().any(|h| {
                h.name.eq_ignore_ascii_case("transfer-encoding")
                    && Header::has_token(h.value, b"chunked")
            })
    }
}