1// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
 2//
 3// This Source Code Form is subject to the terms of the Mozilla Public
 4// License, v. 2.0. If a copy of the MPL was not distributed with this
 5// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 6
 7use minidom::Element;
 8
 9use error::Error;
10
11use ns;
12
13#[derive(Debug, Clone)]
14pub struct ExplicitMessageEncryption {
15    pub namespace: String,
16    pub name: Option<String>,
17}
18
19pub fn parse_explicit_message_encryption(root: &Element) -> Result<ExplicitMessageEncryption, Error> {
20    if !root.is("encryption", ns::EME) {
21        return Err(Error::ParseError("This is not an encryption element."));
22    }
23    for _ in root.children() {
24        return Err(Error::ParseError("Unknown child in encryption element."));
25    }
26    let namespace = root.attr("namespace").ok_or(Error::ParseError("Mandatory argument 'namespace' not present in encryption element."))?.to_owned();
27    let name = root.attr("name").and_then(|value| value.parse().ok());
28    Ok(ExplicitMessageEncryption {
29        namespace: namespace,
30        name: name,
31    })
32}
33
34pub fn serialise(eme: &ExplicitMessageEncryption) -> Element {
35    Element::builder("encryption")
36            .ns(ns::EME)
37            .attr("namespace", eme.namespace.clone())
38            .attr("name", eme.name.clone())
39            .build()
40}
41
42#[cfg(test)]
43mod tests {
44    use minidom::Element;
45    use error::Error;
46    use eme;
47
48    #[test]
49    fn test_simple() {
50        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='urn:xmpp:otr:0'/>".parse().unwrap();
51        let encryption = eme::parse_explicit_message_encryption(&elem).unwrap();
52        assert_eq!(encryption.namespace, "urn:xmpp:otr:0");
53        assert_eq!(encryption.name, None);
54
55        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='some.unknown.mechanism' name='SuperMechanism'/>".parse().unwrap();
56        let encryption = eme::parse_explicit_message_encryption(&elem).unwrap();
57        assert_eq!(encryption.namespace, "some.unknown.mechanism");
58        assert_eq!(encryption.name, Some(String::from("SuperMechanism")));
59    }
60
61    #[test]
62    fn test_unknown() {
63        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
64        let error = eme::parse_explicit_message_encryption(&elem).unwrap_err();
65        let message = match error {
66            Error::ParseError(string) => string,
67            _ => panic!(),
68        };
69        assert_eq!(message, "This is not an encryption element.");
70    }
71
72    #[test]
73    fn test_invalid_child() {
74        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0'><coucou/></encryption>".parse().unwrap();
75        let error = eme::parse_explicit_message_encryption(&elem).unwrap_err();
76        let message = match error {
77            Error::ParseError(string) => string,
78            _ => panic!(),
79        };
80        assert_eq!(message, "Unknown child in encryption element.");
81    }
82
83    #[test]
84    fn test_serialise() {
85        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='coucou'/>".parse().unwrap();
86        let eme = eme::ExplicitMessageEncryption { namespace: String::from("coucou"), name: None };
87        let elem2 = eme::serialise(&eme);
88        assert_eq!(elem, elem2);
89    }
90}