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