1e8ffb02a3
MonthYear used for card expiries; bounds 2000..=2099 are intentional. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
64 lines
1.8 KiB
Rust
64 lines
1.8 KiB
Rust
//! Time helpers and the `MonthYear` type used for card expiries.
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use serde::{Deserialize, Serialize};
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/// Current Unix timestamp in seconds.
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pub fn now_unix() -> i64 {
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chrono::Utc::now().timestamp()
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}
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/// Month + year (1-12 / e.g. 2026). Used for card expiries.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
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pub struct MonthYear {
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pub month: u8,
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pub year: u16,
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}
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impl MonthYear {
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pub fn new(month: u8, year: u16) -> Result<Self, &'static str> {
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if !(1..=12).contains(&month) {
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return Err("month must be 1..=12");
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}
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if year < 2000 || year > 2099 {
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return Err("year must be 2000..=2099");
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}
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Ok(Self { month, year })
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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 now_unix_is_positive_and_recent() {
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let t = now_unix();
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assert!(t > 1_700_000_000); // after late 2023
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assert!(t < 4_000_000_000); // before 2096
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}
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#[test]
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fn month_year_constructor_rejects_bad_month() {
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assert!(MonthYear::new(0, 2026).is_err());
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assert!(MonthYear::new(13, 2026).is_err());
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assert!(MonthYear::new(1, 2026).is_ok());
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assert!(MonthYear::new(12, 2026).is_ok());
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}
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#[test]
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fn month_year_constructor_rejects_bad_year() {
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assert!(MonthYear::new(1, 1999).is_err());
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assert!(MonthYear::new(1, 2100).is_err());
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assert!(MonthYear::new(1, 2000).is_ok());
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assert!(MonthYear::new(1, 2099).is_ok());
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}
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#[test]
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fn month_year_round_trips_through_json() {
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let my = MonthYear::new(7, 2030).unwrap();
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let json = serde_json::to_string(&my).unwrap();
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let parsed: MonthYear = serde_json::from_str(&json).unwrap();
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assert_eq!(parsed, my);
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}
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}
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