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 try_from::TryFrom;
8
9use minidom::Element;
10
11use error::Error;
12
13use ns;
14
15/// Structure representing an `<encryption xmlns='urn:xmpp:eme:0'/>` element.
16#[derive(Debug, Clone)]
17pub struct ExplicitMessageEncryption {
18 /// Namespace of the encryption scheme used.
19 pub namespace: String,
20
21 /// User-friendly name for the encryption scheme, should be `None` for OTR,
22 /// legacy OpenPGP and OX.
23 pub name: Option<String>,
24}
25
26impl TryFrom<Element> for ExplicitMessageEncryption {
27 type Err = Error;
28
29 fn try_from(elem: Element) -> Result<ExplicitMessageEncryption, Error> {
30 check_self!(elem, "encryption", ns::EME);
31 check_no_children!(elem, "encryption");
32 check_no_unknown_attributes!(elem, "encryption", ["namespace", "name"]);
33 Ok(ExplicitMessageEncryption {
34 namespace: get_attr!(elem, "namespace", required),
35 name: get_attr!(elem, "name", optional),
36 })
37 }
38}
39
40impl From<ExplicitMessageEncryption> for Element {
41 fn from(eme: ExplicitMessageEncryption) -> Element {
42 Element::builder("encryption")
43 .ns(ns::EME)
44 .attr("namespace", eme.namespace)
45 .attr("name", eme.name)
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 a 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}