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::str::FromStr;
  8
  9use minidom::IntoAttributeValue;
 10
 11use error::Error;
 12
 13use helpers::Base64;
 14use base64;
 15
 16#[allow(non_camel_case_types)]
 17#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 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 From<Algo> for String {
 49    fn from(algo: Algo) -> String {
 50        String::from(match algo {
 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 text,
 59        })
 60    }
 61}
 62
 63impl IntoAttributeValue for Algo {
 64    fn into_attribute_value(self) -> Option<String> {
 65        Some(String::from(self))
 66    }
 67}
 68
 69generate_element_with_text!(
 70    #[derive(PartialEq)]
 71    Hash, "hash", HASHES,
 72    [
 73        algo: Algo = "algo" => required
 74    ],
 75    hash: Base64<Vec<u8>>
 76);
 77
 78impl Hash {
 79    pub fn new(algo: Algo, hash: Vec<u8>) -> Hash {
 80        Hash {
 81            algo,
 82            hash,
 83        }
 84    }
 85
 86    pub fn from_base64(algo: Algo, hash: &str) -> Result<Hash, Error> {
 87        Ok(Hash::new(algo, base64::decode(hash)?))
 88    }
 89}
 90
 91#[cfg(test)]
 92mod tests {
 93    use super::*;
 94    use try_from::TryFrom;
 95    use minidom::Element;
 96
 97    #[test]
 98    fn test_simple() {
 99        let elem: Element = "<hash xmlns='urn:xmpp:hashes:2' algo='sha-256'>2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=</hash>".parse().unwrap();
100        let hash = Hash::try_from(elem).unwrap();
101        assert_eq!(hash.algo, Algo::Sha_256);
102        assert_eq!(hash.hash, base64::decode("2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=").unwrap());
103    }
104
105    #[test]
106    fn test_unknown() {
107        let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
108        let error = Hash::try_from(elem).unwrap_err();
109        let message = match error {
110            Error::ParseError(string) => string,
111            _ => panic!(),
112        };
113        assert_eq!(message, "This is not a hash element.");
114    }
115
116    #[test]
117    fn test_invalid_child() {
118        let elem: Element = "<hash xmlns='urn:xmpp:hashes:2'><coucou/></hash>".parse().unwrap();
119        let error = Hash::try_from(elem).unwrap_err();
120        let message = match error {
121            Error::ParseError(string) => string,
122            _ => panic!(),
123        };
124        assert_eq!(message, "Unknown child in hash element.");
125    }
126}