mirror of
https://gitlab.com/xmpp-rs/xmpp-rs.git
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137 lines
4 KiB
Rust
137 lines
4 KiB
Rust
// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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use std::convert::TryFrom;
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use std::str::FromStr;
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use minidom::{Element, IntoAttributeValue};
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use error::Error;
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use ns;
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#[allow(non_camel_case_types)]
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#[derive(Debug, Clone, PartialEq)]
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pub enum Algo {
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Sha_1,
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Sha_256,
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Sha_512,
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Sha3_256,
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Sha3_512,
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Blake2b_256,
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Blake2b_512,
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Unknown(String),
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}
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impl FromStr for Algo {
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type Err = Error;
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fn from_str(s: &str) -> Result<Algo, Error> {
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Ok(match s {
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"" => return Err(Error::ParseError("'algo' argument can’t be empty.")),
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"sha-1" => Algo::Sha_1,
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"sha-256" => Algo::Sha_256,
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"sha-512" => Algo::Sha_512,
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"sha3-256" => Algo::Sha3_256,
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"sha3-512" => Algo::Sha3_512,
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"blake2b-256" => Algo::Blake2b_256,
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"blake2b-512" => Algo::Blake2b_512,
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value => Algo::Unknown(value.to_owned()),
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})
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}
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}
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impl IntoAttributeValue for Algo {
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fn into_attribute_value(self) -> Option<String> {
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Some(String::from(match self {
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Algo::Sha_1 => "sha-1",
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Algo::Sha_256 => "sha-256",
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Algo::Sha_512 => "sha-512",
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Algo::Sha3_256 => "sha3-256",
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Algo::Sha3_512 => "sha3-512",
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Algo::Blake2b_256 => "blake2b-256",
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Algo::Blake2b_512 => "blake2b-512",
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Algo::Unknown(text) => return Some(text),
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}))
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}
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}
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#[derive(Debug, Clone, PartialEq)]
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pub struct Hash {
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pub algo: Algo,
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pub hash: String,
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}
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impl<'a> TryFrom<&'a Element> for Hash {
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type Error = Error;
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fn try_from(elem: &'a Element) -> Result<Hash, Error> {
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if !elem.is("hash", ns::HASHES) {
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return Err(Error::ParseError("This is not a hash element."));
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}
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for _ in elem.children() {
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return Err(Error::ParseError("Unknown child in hash element."));
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}
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let algo = match elem.attr("algo") {
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None => Err(Error::ParseError("Mandatory argument 'algo' not present in hash element.")),
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Some(text) => Algo::from_str(text),
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}?;
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let hash = match elem.text().as_ref() {
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"" => return Err(Error::ParseError("Hash element shouldn’t be empty.")),
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text => text.to_owned(),
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};
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Ok(Hash {
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algo: algo,
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hash: hash,
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})
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}
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}
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impl<'a> Into<Element> for &'a Hash {
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fn into(self) -> Element {
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Element::builder("hash")
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.ns(ns::HASHES)
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.attr("algo", self.algo.clone())
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.append(self.hash.clone())
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.build()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_simple() {
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let elem: Element = "<hash xmlns='urn:xmpp:hashes:2' algo='sha-256'>2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=</hash>".parse().unwrap();
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let hash = Hash::try_from(&elem).unwrap();
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assert_eq!(hash.algo, Algo::Sha_256);
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assert_eq!(hash.hash, "2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=");
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}
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#[test]
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fn test_unknown() {
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let elem: Element = "<replace xmlns='urn:xmpp:message-correct:0'/>".parse().unwrap();
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let error = Hash::try_from(&elem).unwrap_err();
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let message = match error {
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Error::ParseError(string) => string,
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_ => panic!(),
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};
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assert_eq!(message, "This is not a hash element.");
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}
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#[test]
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fn test_invalid_child() {
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let elem: Element = "<hash xmlns='urn:xmpp:hashes:2'><coucou/></hash>".parse().unwrap();
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let error = Hash::try_from(&elem).unwrap_err();
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let message = match error {
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Error::ParseError(string) => string,
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_ => panic!(),
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};
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assert_eq!(message, "Unknown child in hash element.");
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}
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}
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