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use regex::Regex;
use std::{convert::TryFrom, fmt::Display, str::FromStr};
use lazy_static::lazy_static;
use serde::{Deserialize, Serialize};
use unicase::UniCase;
use unicode_normalization::UnicodeNormalization;
lazy_static! {
static ref USERNAME_PATTERN: Regex = Regex::new(r"^\w{2,32}$").unwrap();
}
#[derive(Clone, Debug, Serialize, Deserialize, PartialOrd, Ord)]
#[serde(try_from = "&str")]
pub struct Username(String);
impl PartialEq for Username {
fn eq(&self, other: &Self) -> bool {
UniCase::new(self) == UniCase::new(other)
}
}
impl Eq for Username {}
impl Display for Username {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> {
f.write_str(&self.0)
}
}
impl AsRef<str> for Username {
#[inline]
fn as_ref(&self) -> &str {
self.0.as_ref()
}
}
impl std::ops::Deref for Username {
type Target = str;
fn deref(&self) -> &str {
self.0.as_ref()
}
}
impl TryFrom<&str> for Username {
type Error = String;
fn try_from(value: &str) -> Result<Username, String> {
Username::from_str(value)
}
}
impl FromStr for Username {
type Err = String;
fn from_str(src: &str) -> Result<Self, Self::Err> {
let unicode_normalized = src.nfkc().collect::<String>();
if !USERNAME_PATTERN.is_match(&unicode_normalized) {
return Err("invalid username format".to_owned());
}
Ok(Username(unicode_normalized))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn unicode_normalization_works() {
assert_eq!(
Username::from_str("\u{005a}\u{006f}\u{00e9}").unwrap(),
Username::from_str("\u{005a}\u{006f}\u{0065}\u{0301}").unwrap()
);
}
#[test]
fn case_folding_works() {
assert_eq!(
Username::from_str("Coté").unwrap(),
Username::from_str("coté").unwrap()
);
assert_eq!(
Username::from_str("Maße").unwrap(),
Username::from_str("MASSE").unwrap()
);
assert_eq!(
Username::from_str("foobar").unwrap(),
Username::from_str("FoObAr").unwrap()
);
}
#[test]
fn too_long_name() {
assert!(Username::from_str("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").is_err());
}
#[test]
fn too_short_name() {
assert!(Username::from_str("a").is_err());
}
#[test]
fn mixed_case() {
assert_eq!(
Username::from_str("A_lic123").unwrap().to_string(),
"A_lic123"
);
}
#[test]
fn numbers_symbols_work() {
assert_eq!(
Username::from_str("a_lic123").unwrap().to_string(),
"a_lic123"
);
}
#[test]
fn works_with_unicode() {
assert_eq!(Username::from_str("山本").unwrap().to_string(), "山本");
}
#[test]
fn works() {
assert_eq!(
Username::from_str("alice").unwrap(),
Username("alice".to_owned())
);
}
#[test]
fn formats_correctly() {
let user = Username("alice".to_owned());
assert_eq!(format!("{}:password", user), "alice:password");
}
#[test]
fn reject_invalid_usernames() {
let rejected_user = Username::from_str("no-hyphens-allowed");
assert!(rejected_user.is_err());
}
#[test]
fn deserialize_usernames() {
use serde_json;
let rejected_deserialize: Result<Username, _> =
serde_json::from_str(r#""no-hyphens-allowed""#);
assert!(rejected_deserialize.is_err());
let valid_deserialize: Result<Username, _> =
serde_json::from_str(r#""underscores_fine_though""#);
assert_eq!(
valid_deserialize.unwrap().0,
String::from("underscores_fine_though")
);
}
}