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

// Copyright (c) 2018 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
use digest::Digest;
use sha1::Sha1;

use crate::core::{FromXml, IntoXml};
use crate::ns::COMPONENT;

/// The main authentication mechanism for components.
#[derive(FromXml, IntoXml, Debug, Clone, PartialEq, Default)]
#[xml(namespace = COMPONENT, name = "handshake")]
pub struct Handshake {
    /// If Some, contains the hex-encoded SHA-1 of the concatenation of the
    /// stream id and the password, and is used to authenticate against the
    /// server.
    ///
    /// If None, it is the successful reply from the server, the stream is now
    /// fully established and both sides can now exchange stanzas.
    #[xml(text)]
    pub data: String,
}

impl Handshake {
    /// Creates a successful reply from a server.
    pub fn new() -> Handshake {
        Handshake::default()
    }

    /// Creates an authentication request from the component.
    pub fn from_password_and_stream_id(password: &str, stream_id: &str) -> Handshake {
        let input = String::from(stream_id) + password;
        let hash = Sha1::digest(input.as_bytes());
        let content = format!("{:x}", hash);
        Handshake { data: content }
    }
}

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

    #[cfg(target_pointer_width = "32")]
    #[test]
    fn test_size() {
        assert_size!(Handshake, 12);
    }

    #[cfg(target_pointer_width = "64")]
    #[test]
    fn test_size() {
        assert_size!(Handshake, 24);
    }

    #[test]
    fn test_simple() {
        let elem: Element = "<handshake xmlns='jabber:component:accept'/>"
            .parse()
            .unwrap();
        let handshake = Handshake::try_from(elem).unwrap();
        assert_eq!(handshake.data, "");

        let elem: Element = "<handshake xmlns='jabber:component:accept'>Coucou</handshake>"
            .parse()
            .unwrap();
        let handshake = Handshake::try_from(elem).unwrap();
        assert_eq!(handshake.data, String::from("Coucou"));
    }

    #[test]
    fn test_constructors() {
        let handshake = Handshake::new();
        assert_eq!(handshake.data, "");

        let handshake = Handshake::from_password_and_stream_id("123456", "sid");
        assert_eq!(
            handshake.data,
            String::from("9accec263ab84a43c6037ccf7cd48cb1d3f6df8e")
        );
    }
}