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;
8use std::str::FromStr;
9
10use minidom::{Element, IntoAttributeValue};
11
12use error::Error;
13
14use ns;
15
16#[allow(non_camel_case_types)]
17#[derive(Debug, Clone, PartialEq)]
18pub enum Algo {
19 Sha_1,
20 Sha_256,
21 Sha_512,
22 Sha3_256,
23 Sha3_512,
24 Blake2b_256,
25 Blake2b_512,
26 Unknown(String),
27}
28
29impl FromStr for Algo {
30 type Err = Error;
31
32 fn from_str(s: &str) -> Result<Algo, Error> {
33 Ok(match s {
34 "" => return Err(Error::ParseError("'algo' argument can’t be empty.")),
35
36 "sha-1" => Algo::Sha_1,
37 "sha-256" => Algo::Sha_256,
38 "sha-512" => Algo::Sha_512,
39 "sha3-256" => Algo::Sha3_256,
40 "sha3-512" => Algo::Sha3_512,
41 "blake2b-256" => Algo::Blake2b_256,
42 "blake2b-512" => Algo::Blake2b_512,
43 value => Algo::Unknown(value.to_owned()),
44 })
45 }
46}
47
48impl IntoAttributeValue for Algo {
49 fn into_attribute_value(self) -> Option<String> {
50 Some(String::from(match self {
51 Algo::Sha_1 => "sha-1",
52 Algo::Sha_256 => "sha-256",
53 Algo::Sha_512 => "sha-512",
54 Algo::Sha3_256 => "sha3-256",
55 Algo::Sha3_512 => "sha3-512",
56 Algo::Blake2b_256 => "blake2b-256",
57 Algo::Blake2b_512 => "blake2b-512",
58 Algo::Unknown(text) => return Some(text),
59 }))
60 }
61}
62
63#[derive(Debug, Clone, PartialEq)]
64pub struct Hash {
65 pub algo: Algo,
66 pub hash: String,
67}
68
69impl TryFrom<Element> for Hash {
70 type Error = Error;
71
72 fn try_from(elem: Element) -> Result<Hash, Error> {
73 if !elem.is("hash", ns::HASHES) {
74 return Err(Error::ParseError("This is not a hash element."));
75 }
76 for _ in elem.children() {
77 return Err(Error::ParseError("Unknown child in hash element."));
78 }
79 let algo = get_attr!(elem, "algo", required);
80 let hash = match elem.text().as_ref() {
81 "" => return Err(Error::ParseError("Hash element shouldn’t be empty.")),
82 text => text.to_owned(),
83 };
84 Ok(Hash {
85 algo: algo,
86 hash: hash,
87 })
88 }
89}
90
91impl Into<Element> for Hash {
92 fn into(self) -> Element {
93 Element::builder("hash")
94 .ns(ns::HASHES)
95 .attr("algo", self.algo)
96 .append(self.hash.clone())
97 .build()
98 }
99}
100
101#[cfg(test)]
102mod tests {
103 use super::*;
104
105 #[test]
106 fn test_simple() {
107 let elem: Element = "<hash xmlns='urn:xmpp:hashes:2' algo='sha-256'>2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=</hash>".parse().unwrap();
108 let hash = Hash::try_from(elem).unwrap();
109 assert_eq!(hash.algo, Algo::Sha_256);
110 assert_eq!(hash.hash, "2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=");
111 }
112
113 #[test]
114 fn test_unknown() {
115 let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
116 let error = Hash::try_from(elem).unwrap_err();
117 let message = match error {
118 Error::ParseError(string) => string,
119 _ => panic!(),
120 };
121 assert_eq!(message, "This is not a hash element.");
122 }
123
124 #[test]
125 fn test_invalid_child() {
126 let elem: Element = "<hash xmlns='urn:xmpp:hashes:2'><coucou/></hash>".parse().unwrap();
127 let error = Hash::try_from(elem).unwrap_err();
128 let message = match error {
129 Error::ParseError(string) => string,
130 _ => panic!(),
131 };
132 assert_eq!(message, "Unknown child in hash element.");
133 }
134}