55 lines
1.5 KiB
Rust
55 lines
1.5 KiB
Rust
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#![allow(clippy::type_complexity)]
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pub trait Validator {
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type Output;
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type Error;
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fn to_fn(&self) -> Box<dyn Fn(String) -> Result<Self::Output, Self::Error>>;
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}
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#[derive(thiserror::Error, Debug)]
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pub enum PinError {
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#[error("PIN too short: {0} < {1}")]
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TooShort(usize, usize),
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#[error("PIN too long: {0} > {1}")]
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TooLong(usize, usize),
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#[error("PIN contained invalid characters (found {0} at position {1})")]
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InvalidCharacters(char, usize),
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}
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#[derive(Default, Clone)]
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pub struct PinValidator {
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pub min_length: Option<usize>,
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pub max_length: Option<usize>,
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pub range: Option<std::ops::RangeInclusive<char>>,
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}
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impl Validator for PinValidator {
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type Output = String;
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type Error = PinError;
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fn to_fn(&self) -> Box<dyn Fn(String) -> Result<String, PinError>> {
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let min_len = self.min_length.unwrap_or(usize::MIN);
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let max_len = self.max_length.unwrap_or(usize::MAX);
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let range = self.range.clone().unwrap_or('0'..='9');
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Box::new(move |mut s: String| {
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s.truncate(s.trim_end().len());
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let len = s.len();
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if len < min_len {
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return Err(PinError::TooShort(len, min_len));
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}
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if len > max_len {
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return Err(PinError::TooLong(len, max_len));
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}
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for (index, ch) in s.chars().enumerate() {
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if !range.contains(&ch) {
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return Err(PinError::InvalidCharacters(ch, index));
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}
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}
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Ok(s)
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})
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}
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}
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