matrix-bridge-telegram 0.1.0

A bridge between Matrix and Telegram written in Rust
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

use regex::Regex;
use std::sync::LazyLock;

static HTML_TAG_REGEX: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"<[^>]*>").unwrap());

pub fn strip_html_tags(input: &str) -> String {
    HTML_TAG_REGEX.replace_all(input, "").to_string()
}

pub fn escape_html(input: &str) -> String {
    input
        .replace('&', "&amp;")
        .replace('<', "&lt;")
        .replace('>', "&gt;")
        .replace('"', "&quot;")
        .replace('\'', "&#39;")
}

pub fn escape_markdown(input: &str) -> String {
    input
        .replace('_', r"\_")
        .replace('*', r"\*")
        .replace('[', r"\[")
        .replace(']', r"\]")
        .replace('(', r"\(")
        .replace(')', r"\)")
        .replace('~', r"\~")
        .replace('`', r"\`")
        .replace('>', r"\>")
        .replace('#', r"\#")
        .replace('+', r"\+")
        .replace('-', r"\-")
        .replace('=', r"\=")
        .replace('|', r"\|")
        .replace('{', r"\{")
        .replace('}', r"\}")
        .replace('.', r"\.")
        .replace('!', r"\!")
}

pub fn truncate_string(s: &str, max_len: usize) -> &str {
    if s.len() <= max_len {
        s
    } else {
        let mut end = max_len;
        while !s.is_char_boundary(end) && end > 0 {
            end -= 1;
        }
        &s[..end]
    }
}

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

    #[test]
    fn test_strip_html_tags() {
        assert_eq!(strip_html_tags("<b>hello</b>"), "hello");
        assert_eq!(strip_html_tags("<a href=\"test\">link</a>"), "link");
    }

    #[test]
    fn test_escape_html() {
        assert_eq!(escape_html("<script>"), "&lt;script&gt;");
        assert_eq!(escape_html("a & b"), "a &amp; b");
    }

    #[test]
    fn test_truncate_string() {
        assert_eq!(truncate_string("hello world", 5), "hello");
        assert_eq!(truncate_string("hello", 10), "hello");
    }
}