4ed22af9e5
Adapted from MikaelKW/nodecast-tv-plus commits c267d98d734753a09b08d267c8ec2c3fa11c33f5, b761690bac7626a3cc5ddf754d96b14a02f506fe, and 5524fdaffed5c6a44ae69474e7eaa2f18d428c75. Preserve every parser batch, decode gzip once, and retain live channel metadata. Co-authored-by: Mikael <mikaelkwessel@gmail.com>
95 lines
3.5 KiB
JavaScript
95 lines
3.5 KiB
JavaScript
function createValidatedCalendarDate(year, month, day, hour, minute, second) {
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if (
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month < 1 || month > 12 ||
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day < 1 || day > 31 ||
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hour < 0 || hour > 23 ||
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minute < 0 || minute > 59 ||
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second < 0 || second > 59
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) {
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return null;
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}
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// setUTCFullYear avoids Date.UTC's special handling of years 0-99.
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const calendarDate = new Date(0);
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calendarDate.setUTCFullYear(year, month - 1, day);
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calendarDate.setUTCHours(hour, minute, second, 0);
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// Date normalizes impossible calendar values (for example February 30),
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// so compare every component before accepting it.
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if (
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calendarDate.getUTCFullYear() !== year ||
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calendarDate.getUTCMonth() !== month - 1 ||
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calendarDate.getUTCDate() !== day ||
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calendarDate.getUTCHours() !== hour ||
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calendarDate.getUTCMinutes() !== minute ||
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calendarDate.getUTCSeconds() !== second
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) {
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return null;
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}
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return calendarDate;
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}
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function parseTimezoneOffset(timezone) {
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if (!timezone || timezone.toUpperCase() === 'Z') return 0;
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const normalized = timezone.replace(':', '');
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const offsetHours = Number(normalized.slice(1, 3));
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const offsetRemainder = Number(normalized.slice(3, 5));
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if (offsetHours > 23 || offsetRemainder > 59) return null;
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const total = (offsetHours * 60) + offsetRemainder;
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return normalized[0] === '-' ? -total : total;
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}
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/**
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* Parse an XMLTV date/time. XMLTV permits YYYYMMDDHHmmss or a shorter
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* initial precision (for example YYYYMMDDHHmm, YYYYMMDDHH, or YYYYMMDD).
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* Missing components use the earliest value in that precision and UTC is
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* assumed when no numeric offset is provided.
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* @param {string} dateStr - XMLTV format date string
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* @returns {Date|null}
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*/
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function parseXmltvDate(dateStr) {
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if (!dateStr) return null;
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const value = String(dateStr).trim();
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const match = value.match(/^(\d{4}(?:\d{2}){0,5})\s*(Z|[+-]\d{4})?$/i);
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if (!match) {
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// Preserve the existing compatibility fallback for explicit ISO 8601
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// timestamps without accepting arbitrary host-dependent date strings.
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const isoMatch = value.match(/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(?::(\d{2})(?:\.\d{1,3})?)?(Z|[+-]\d{2}:?\d{2})$/i);
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if (!isoMatch) return null;
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const [, year, month, day, hour, minute, second = '0', timezone] = isoMatch;
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if (!createValidatedCalendarDate(
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Number(year),
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Number(month),
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Number(day),
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Number(hour),
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Number(minute),
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Number(second)
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) || parseTimezoneOffset(timezone) === null) return null;
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const isoDate = new Date(value);
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return Number.isNaN(isoDate.getTime()) ? null : isoDate;
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}
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const digits = match[1];
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const timezone = match[2]?.toUpperCase();
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const year = Number(digits.slice(0, 4));
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const month = digits.length >= 6 ? Number(digits.slice(4, 6)) : 1;
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const day = digits.length >= 8 ? Number(digits.slice(6, 8)) : 1;
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const hour = digits.length >= 10 ? Number(digits.slice(8, 10)) : 0;
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const minute = digits.length >= 12 ? Number(digits.slice(10, 12)) : 0;
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const second = digits.length >= 14 ? Number(digits.slice(12, 14)) : 0;
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const calendarDate = createValidatedCalendarDate(year, month, day, hour, minute, second);
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const offsetMinutes = parseTimezoneOffset(timezone);
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if (!calendarDate || offsetMinutes === null) return null;
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return new Date(calendarDate.getTime() - (offsetMinutes * 60 * 1000));
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}
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module.exports = { parseXmltvDate };
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