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
28#[cfg(test)]
29mod tests {
30    use minidom::Element;
31    use error::Error;
32    use eme;
33
34    #[test]
35    fn test_simple() {
36        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='urn:xmpp:otr:0'/>".parse().unwrap();
37        let encryption = eme::parse_explicit_message_encryption(&elem).unwrap();
38        assert_eq!(encryption.namespace, "urn:xmpp:otr:0");
39        assert_eq!(encryption.name, None);
40
41        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='some.unknown.mechanism' name='SuperMechanism'/>".parse().unwrap();
42        let encryption = eme::parse_explicit_message_encryption(&elem).unwrap();
43        assert_eq!(encryption.namespace, "some.unknown.mechanism");
44        assert_eq!(encryption.name, Some(String::from("SuperMechanism")));
45    }
46
47    #[test]
48    fn test_unknown() {
49        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
50        let error = eme::parse_explicit_message_encryption(&elem).unwrap_err();
51        let message = match error {
52            Error::ParseError(string) => string,
53            _ => panic!(),
54        };
55        assert_eq!(message, "This is not an encryption element.");
56    }
57
58    #[test]
59    fn test_invalid_child() {
60        let elem: Element = "<encryption xmlns='urn:xmpp:eme:0'><coucou/></encryption>".parse().unwrap();
61        let error = eme::parse_explicit_message_encryption(&elem).unwrap_err();
62        let message = match error {
63            Error::ParseError(string) => string,
64            _ => panic!(),
65        };
66        assert_eq!(message, "Unknown child in encryption element.");
67    }
68}