iris-chat 0.1.50

Iris Chat command line client and shared encrypted chat core
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

use super::*;

/// Presentation only: valid content references never expose a hash/key in a
/// notification or chat-list excerpt. The saved body and attachment stay intact.
pub(super) fn without_hash_references(text: &str) -> String {
    let bytes = text.as_bytes();
    let mut output = String::with_capacity(text.len());
    let mut cursor = 0;
    let mut copied = 0;
    while let Some(relative) = text[cursor..].find("nhash1") {
        let hash_start = cursor + relative;
        let mut end = hash_start;
        while bytes.get(end).is_some_and(u8::is_ascii_alphanumeric) {
            end += 1;
        }
        cursor = end;
        if hashtree_core::nhash_decode(&text[hash_start..end]).is_err() {
            continue;
        }
        let mut start = hash_start;
        for prefix in ["htree://", "nhash://"] {
            if text[..start].ends_with(prefix) {
                start -= prefix.len();
                break;
            }
        }
        if text[..start]
            .chars()
            .next_back()
            .is_some_and(|c| c.is_alphanumeric() || c == '_')
        {
            continue;
        }
        let mut label = "Attachment";
        if bytes.get(end) == Some(&b'/') {
            let filename_start = end + 1;
            end = filename_start;
            while bytes
                .get(end)
                .is_some_and(|byte| !byte.is_ascii_whitespace() && !b"<>\"')]}".contains(byte))
            {
                end += 1;
            }
            while end > filename_start
                && bytes
                    .get(end - 1)
                    .is_some_and(|byte| b".,;:!?".contains(byte))
            {
                end -= 1;
            }
            if let Some(attachment) = parse_file_link(&text[start..end]) {
                label = attachment_preview_label(&attachment);
            }
        }
        // Markdown/image wrappers are one attachment reference, not visible
        // punctuation around a hidden URL. Plain parentheses remain readable.
        if bytes.get(end) == Some(&b')') && text[..start].ends_with("](") {
            if let Some(open) = text[..start - 2].rfind('[') {
                let title = &text[open + 1..start - 2];
                if !title.contains(['\n', '[', ']']) {
                    start = if open > 0 && bytes.get(open - 1) == Some(&b'!') {
                        open - 1
                    } else {
                        open
                    };
                    end += 1;
                }
            }
        }
        if start < copied {
            continue;
        }
        output.push_str(&text[copied..start]);
        output.push_str(label);
        copied = end;
        cursor = end;
    }
    output.push_str(&text[copied..]);
    output
}

#[cfg(test)]
mod tests {
    use super::*;
    const HASH: &str = "nhash1qqsqzqgpqyqszqgpqyqszqgpqyqszqgpqyqszqgpqyqszqgpqyqszqge7dr00";
    #[test]
    fn nhash_preview_validates_checksum_and_preserves_captions_and_wrappers() {
        assert!(hashtree_core::nhash_decode(HASH).is_ok());
        for (input, expected) in [
            (HASH.to_string(), "Attachment"),
            (format!("Caption {HASH}"), "Caption Attachment"),
            (format!("({HASH})"), "(Attachment)"),
            (
                format!("htree://{HASH} nhash://{HASH}"),
                "Attachment Attachment",
            ),
            (format!("[Download]({HASH})"), "Attachment"),
            (format!("![Image](htree://{HASH}/photo.png)"), "Photo"),
            (format!("Caption {HASH}/clip.mp4!"), "Caption Video!"),
            (
                "A literal nhash1bad is ordinary text".into(),
                "A literal nhash1bad is ordinary text",
            ),
        ] {
            assert_eq!(without_hash_references(&input), expected, "{input}");
        }
        for input in [
            format!("prefix{HASH}"),
            format!("é{HASH}"),
            format!("_{HASH}"),
        ] {
            assert_eq!(without_hash_references(&input), input);
        }
        assert_eq!(
            without_hash_references(&format!("{HASH}, {HASH}!")),
            "Attachment, Attachment!"
        );
        let invalid = format!("{}x", &HASH[..HASH.len() - 1]);
        assert_eq!(without_hash_references(&invalid), invalid);
    }
    #[test]
    fn nhash_preview_sanitizes_reply_and_forward_bodies_without_rewriting_content() {
        let body = format!("↩ Alex: Earlier {HASH}\n\nCaption {HASH}");
        assert_eq!(chat_message_body_preview(&body), "Caption Attachment");
        assert!(body.contains(HASH));
        assert_eq!(
            chat_message_body_preview(&format!("Forwarded:\n\n{HASH}")),
            "Forwarded:\n\nAttachment"
        );
    }
}