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;
  8use std::str::FromStr;
  9
 10use minidom::{Element, IntoAttributeValue};
 11
 12use error::Error;
 13
 14use ns;
 15use helpers::Base64;
 16use base64;
 17
 18#[allow(non_camel_case_types)]
 19#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 20pub enum Algo {
 21    Sha_1,
 22    Sha_256,
 23    Sha_512,
 24    Sha3_256,
 25    Sha3_512,
 26    Blake2b_256,
 27    Blake2b_512,
 28    Unknown(String),
 29}
 30
 31impl FromStr for Algo {
 32    type Err = Error;
 33
 34    fn from_str(s: &str) -> Result<Algo, Error> {
 35        Ok(match s {
 36            "" => return Err(Error::ParseError("'algo' argument can’t be empty.")),
 37
 38            "sha-1" => Algo::Sha_1,
 39            "sha-256" => Algo::Sha_256,
 40            "sha-512" => Algo::Sha_512,
 41            "sha3-256" => Algo::Sha3_256,
 42            "sha3-512" => Algo::Sha3_512,
 43            "blake2b-256" => Algo::Blake2b_256,
 44            "blake2b-512" => Algo::Blake2b_512,
 45            value => Algo::Unknown(value.to_owned()),
 46        })
 47    }
 48}
 49
 50impl From<Algo> for String {
 51    fn from(algo: Algo) -> String {
 52        String::from(match algo {
 53            Algo::Sha_1 => "sha-1",
 54            Algo::Sha_256 => "sha-256",
 55            Algo::Sha_512 => "sha-512",
 56            Algo::Sha3_256 => "sha3-256",
 57            Algo::Sha3_512 => "sha3-512",
 58            Algo::Blake2b_256 => "blake2b-256",
 59            Algo::Blake2b_512 => "blake2b-512",
 60            Algo::Unknown(text) => return text,
 61        })
 62    }
 63}
 64
 65impl IntoAttributeValue for Algo {
 66    fn into_attribute_value(self) -> Option<String> {
 67        Some(String::from(self))
 68    }
 69}
 70
 71generate_element_with_text!(
 72    #[derive(PartialEq)]
 73    Hash, "hash", ns::HASHES,
 74    [
 75        algo: Algo = "algo" => required
 76    ],
 77    hash: Base64<Vec<u8>>
 78);
 79
 80impl Hash {
 81    pub fn new(algo: Algo, hash: Vec<u8>) -> Hash {
 82        Hash {
 83            algo,
 84            hash,
 85        }
 86    }
 87
 88    pub fn from_base64(algo: Algo, hash: &str) -> Result<Hash, Error> {
 89        Ok(Hash::new(algo, base64::decode(hash)?))
 90    }
 91}
 92
 93#[cfg(test)]
 94mod tests {
 95    use super::*;
 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}