| 1 | //! Timestamp helpers for comparing against App Store Connect's expiry |
| 2 | //! strings without a date-parsing dependency. |
| 3 | |
| 4 | /// Whether an ISO-8601 UTC timestamp is in the past. |
| 5 | /// |
| 6 | /// Lexicographic comparison is sound for the fixed-width UTC timestamps |
| 7 | /// App Store Connect returns, and avoids a date-parsing dependency for a |
| 8 | /// field that is only ever compared and displayed. |
| 9 | pub fn is_expired(expiration_date: &str, now: &str) -> bool { |
| 10 | expiration_date < now |
| 11 | } |
| 12 | |
| 13 | /// Current UTC time as `YYYY-MM-DDTHH:MM:SS`, for comparison against |
| 14 | /// Apple's expiry strings. |
| 15 | pub fn now_iso8601() -> String { |
| 16 | let secs = std::time::SystemTime::now() |
| 17 | .duration_since(std::time::UNIX_EPOCH) |
| 18 | .unwrap_or_default() |
| 19 | .as_secs() as i64; |
| 20 | |
| 21 | // days_from_civil, inverted. Shifting the era to March makes the leap |
| 22 | // day the last day of the year, which removes every special case. |
| 23 | let days = secs.div_euclid(86_400); |
| 24 | let secs_of_day = secs.rem_euclid(86_400); |
| 25 | let z = days + 719_468; |
| 26 | let era = z.div_euclid(146_097); |
| 27 | let doe = z.rem_euclid(146_097); |
| 28 | let yoe = (doe - doe / 1460 + doe / 36_524 - doe / 146_096) / 365; |
| 29 | let y = yoe + era * 400; |
| 30 | let doy = doe - (365 * yoe + yoe / 4 - yoe / 100); |
| 31 | let mp = (5 * doy + 2) / 153; |
| 32 | let d = doy - (153 * mp + 2) / 5 + 1; |
| 33 | let m = if mp < 10 { mp + 3 } else { mp - 9 }; |
| 34 | let y = if m <= 2 { y + 1 } else { y }; |
| 35 | |
| 36 | format!( |
| 37 | "{:04}-{:02}-{:02}T{:02}:{:02}:{:02}", |
| 38 | y, |
| 39 | m, |
| 40 | d, |
| 41 | secs_of_day / 3600, |
| 42 | (secs_of_day % 3600) / 60, |
| 43 | secs_of_day % 60 |
| 44 | ) |
| 45 | } |