xmpp-rs/src/util/helpers.rs

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// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
use crate::util::error::Error;
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use jid::Jid;
use std::str::FromStr;
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/// Codec for plain text content.
pub struct PlainText;
impl PlainText {
pub fn decode(s: &str) -> Result<Option<String>, Error> {
Ok(match s {
"" => None,
text => Some(text.to_owned()),
})
}
pub fn encode(string: &Option<String>) -> Option<String> {
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string.as_ref().map(ToOwned::to_owned)
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}
}
/// Codec for trimmed plain text content.
pub struct TrimmedPlainText;
impl TrimmedPlainText {
pub fn decode(s: &str) -> Result<String, Error> {
Ok(match s.trim() {
"" => return Err(Error::ParseError("URI missing in uri.")),
text => text.to_owned(),
})
}
pub fn encode(string: &str) -> Option<String> {
Some(string.to_owned())
}
}
/// Codec wrapping base64 encode/decode.
pub struct Base64;
impl Base64 {
pub fn decode(s: &str) -> Result<Vec<u8>, Error> {
Ok(base64::decode(s)?)
}
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pub fn encode(b: &[u8]) -> Option<String> {
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Some(base64::encode(b))
}
}
/// Codec wrapping base64 encode/decode, while ignoring whitespace characters.
pub struct WhitespaceAwareBase64;
impl WhitespaceAwareBase64 {
pub fn decode(s: &str) -> Result<Vec<u8>, Error> {
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let s: String = s.chars().filter(|ch| *ch != ' ' && *ch != '\n' && *ch != '\t').collect();
Ok(base64::decode(&s)?)
}
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pub fn encode(b: &[u8]) -> Option<String> {
Some(base64::encode(b))
}
}
/// Codec for colon-separated bytes of uppercase hexadecimal.
pub struct ColonSeparatedHex;
impl ColonSeparatedHex {
pub fn decode(s: &str) -> Result<Vec<u8>, Error> {
let mut bytes = vec![];
for i in 0..(1 + s.len()) / 3 {
let byte = u8::from_str_radix(&s[3 * i..3 * i + 2], 16)?;
if 3 * i + 2 < s.len() {
assert_eq!(&s[3 * i + 2..3 * i + 3], ":");
}
bytes.push(byte);
}
Ok(bytes)
}
pub fn encode(b: &[u8]) -> Option<String> {
let mut bytes = vec![];
for byte in b {
bytes.push(format!("{:02X}", byte));
}
Some(bytes.join(":"))
}
}
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/// Codec for a JID.
pub struct JidCodec;
impl JidCodec {
pub fn decode(s: &str) -> Result<Jid, Error> {
Ok(Jid::from_str(s)?)
}
pub fn encode(jid: &Jid) -> Option<String> {
Some(jid.to_string())
}
}