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

/*
 * Copyright Stalwart Labs Ltd. See the COPYING
 * file at the top-level directory of this distribution.
 *
 * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
 * option. This file may not be copied, modified, or distributed
 * except according to those terms.
 */

use crate::{parsers::MessageStream, HeaderValue};

impl<'x> MessageStream<'x> {
    pub fn parse_id(&mut self) -> HeaderValue<'x> {
        let mut token_start: usize = 0;
        let mut token_end: usize = 0;
        let mut token_invalid_start: usize = 0; // Handle broken clients
        let mut token_invalid_end: usize = 0; // Handle broken clients
        let mut is_id_part = false;
        let mut ids = Vec::new();

        while let Some(&ch) = self.next() {
            match ch {
                b'\n' => {
                    if !self.try_next_is_space() {
                        return match ids.len() {
                            1 => HeaderValue::Text(ids.pop().unwrap()),
                            0 => {
                                if token_invalid_start > 0 {
                                    HeaderValue::Text(String::from_utf8_lossy(
                                        self.bytes(token_invalid_start - 1..token_invalid_end),
                                    ))
                                } else {
                                    HeaderValue::Empty
                                }
                            }
                            _ => HeaderValue::TextList(ids),
                        };
                    } else {
                        continue;
                    }
                }
                b'<' => {
                    is_id_part = true;
                    continue;
                }
                b'>' => {
                    is_id_part = false;
                    if token_start > 0 {
                        ids.push(String::from_utf8_lossy(
                            self.bytes(token_start - 1..token_end),
                        ));
                        token_start = 0;
                    } else {
                        continue;
                    }
                }
                b' ' | b'\t' | b'\r' => continue,
                _ => {}
            }
            if is_id_part {
                if token_start == 0 {
                    token_start = self.offset();
                }
                token_end = self.offset();
            } else {
                if token_invalid_start == 0 {
                    token_invalid_start = self.offset();
                }
                token_invalid_end = self.offset();
            }
        }

        HeaderValue::Empty
    }
}
#[cfg(test)]
mod tests {
    use std::borrow::Cow;

    use crate::parsers::{fields::load_tests, MessageStream};

    #[test]
    fn parse_message_ids() {
        for test in load_tests::<Option<Vec<Cow<'static, str>>>>("id.json") {
            assert_eq!(
                MessageStream::new(test.header.as_bytes())
                    .parse_id()
                    .into_text_list(),
                test.expected,
                "failed for {:?}",
                test.header
            );
        }
    }
}