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 std::convert::TryFrom;
8
9use minidom::Element;
10
11use error::Error;
12
13use ns;
14
15#[derive(Debug, Clone)]
16pub struct ExplicitMessageEncryption {
17 pub namespace: String,
18 pub name: Option<String>,
19}
20
21impl<'a> TryFrom<&'a Element> for ExplicitMessageEncryption {
22 type Error = Error;
23
24 fn try_from(elem: &'a Element) -> Result<ExplicitMessageEncryption, Error> {
25 if !elem.is("encryption", ns::EME) {
26 return Err(Error::ParseError("This is not an encryption element."));
27 }
28 for _ in elem.children() {
29 return Err(Error::ParseError("Unknown child in encryption element."));
30 }
31 let namespace = elem.attr("namespace").ok_or(Error::ParseError("Mandatory argument 'namespace' not present in encryption element."))?.to_owned();
32 let name = elem.attr("name").and_then(|value| value.parse().ok());
33 Ok(ExplicitMessageEncryption {
34 namespace: namespace,
35 name: name,
36 })
37 }
38}
39
40impl<'a> Into<Element> for &'a ExplicitMessageEncryption {
41 fn into(self) -> Element {
42 Element::builder("encryption")
43 .ns(ns::EME)
44 .attr("namespace", self.namespace.clone())
45 .attr("name", self.name.clone())
46 .build()
47 }
48}
49
50#[cfg(test)]
51mod tests {
52 use super::*;
53
54 #[test]
55 fn test_simple() {
56 let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='urn:xmpp:otr:0'/>".parse().unwrap();
57 let encryption = ExplicitMessageEncryption::try_from(&elem).unwrap();
58 assert_eq!(encryption.namespace, "urn:xmpp:otr:0");
59 assert_eq!(encryption.name, None);
60
61 let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='some.unknown.mechanism' name='SuperMechanism'/>".parse().unwrap();
62 let encryption = ExplicitMessageEncryption::try_from(&elem).unwrap();
63 assert_eq!(encryption.namespace, "some.unknown.mechanism");
64 assert_eq!(encryption.name, Some(String::from("SuperMechanism")));
65 }
66
67 #[test]
68 fn test_unknown() {
69 let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
70 let error = ExplicitMessageEncryption::try_from(&elem).unwrap_err();
71 let message = match error {
72 Error::ParseError(string) => string,
73 _ => panic!(),
74 };
75 assert_eq!(message, "This is not an encryption element.");
76 }
77
78 #[test]
79 fn test_invalid_child() {
80 let elem: Element = "<encryption xmlns='urn:xmpp:eme:0'><coucou/></encryption>".parse().unwrap();
81 let error = ExplicitMessageEncryption::try_from(&elem).unwrap_err();
82 let message = match error {
83 Error::ParseError(string) => string,
84 _ => panic!(),
85 };
86 assert_eq!(message, "Unknown child in encryption element.");
87 }
88
89 #[test]
90 fn test_serialise() {
91 let elem: Element = "<encryption xmlns='urn:xmpp:eme:0' namespace='coucou'/>".parse().unwrap();
92 let eme = ExplicitMessageEncryption { namespace: String::from("coucou"), name: None };
93 let elem2 = (&eme).into();
94 assert_eq!(elem, elem2);
95 }
96}