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use std::fmt::Display;
use std::ops::Deref;
use std::str::FromStr;
use anyhow::bail;
use serde::de::Error;
use serde::{Deserialize, Deserializer, Serialize};
#[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize)]
#[repr(transparent)]
#[serde(transparent)]
pub struct Name(String);
impl Name {
#[inline]
fn validate(s: impl AsRef<str>) -> anyhow::Result<()> {
let s = s.as_ref();
if s.is_empty() {
bail!("empty user name")
}
if s.find(|c| !matches!(c, '0'..='9' | 'a'..='z' | 'A'..='Z'))
.is_some()
{
bail!("invalid characters in user name")
} else {
Ok(())
}
}
}
impl Deref for Name {
type Target = String;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<'de> Deserialize<'de> for Name {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let name = String::deserialize(deserializer)?;
name.try_into().map_err(D::Error::custom)
}
}
impl Display for Name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
impl FromStr for Name {
type Err = anyhow::Error;
#[inline]
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::validate(s).map(|()| Self(s.into()))
}
}
impl TryFrom<String> for Name {
type Error = anyhow::Error;
#[inline]
fn try_from(s: String) -> Result<Self, Self::Error> {
Self::validate(&s).map(|()| Self(s))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn from_str() {
assert!("".parse::<Name>().is_err());
assert!(" ".parse::<Name>().is_err());
assert!("/".parse::<Name>().is_err());
assert!("name/".parse::<Name>().is_err());
assert!("/name".parse::<Name>().is_err());
assert!("n%ame".parse::<Name>().is_err());
assert!("n.ame".parse::<Name>().is_err());
assert_eq!("name".parse::<Name>().unwrap(), Name("name".into()));
assert_eq!("n4M3".parse::<Name>().unwrap(), Name("n4M3".into()));
}
}