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51 lines
3.3 KiB
JavaScript
51 lines
3.3 KiB
JavaScript
// JavaScript callers of the Date field constructor and the date-string
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// parser: arguments pass through ToNumber in order (valueOf runs, strings
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// and booleans convert, a throwing conversion stops the rest), arguments
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// past the seventh are evaluated but never converted, and RFC 1123 dates
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// parse the way HTTP caching middleware reads them.
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process.env.TZ = "Europe/Berlin";
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const log = [];
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const arg = (name, value) => ({ valueOf() { log.push(name); return value; } });
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const d = new Date(arg("y", 2024), arg("m", 1), arg("d", 29), arg("h", 13), arg("mi", 5), arg("s", 6), arg("ms", 7), arg("extra", 8));
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console.log(d.getTime(), d.toISOString(), log.join(","));
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console.log(new Date("2024", "0", "15").getTime(), new Date(2024, true, null).getTime(), new Date(2024, undefined).getTime());
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console.log(new Date(2024, 0, "x").getTime(), new Date(99, 0).getFullYear(), new Date(2024, 0, 1, 2, 3).getHours());
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try {
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new Date(2024, arg("m", 0), { valueOf() { throw new Error("conversion stopped"); } }, arg("h", 1));
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} catch (e) {
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console.log(e.message, log.slice(-1).join(","));
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}
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function isFresh(reqHeaders, resHeaders) {
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const modifiedSince = reqHeaders["if-modified-since"];
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const lastModified = resHeaders["last-modified"];
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if (!modifiedSince || !lastModified) return false;
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const lm = Date.parse(lastModified);
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const ms = Date.parse(modifiedSince);
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return !(isNaN(lm) || isNaN(ms) || lm > ms);
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}
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console.log(isFresh({ "if-modified-since": "Mon, 01 Jan 2024 00:00:00 GMT" }, { "last-modified": "Sun, 31 Dec 2023 00:00:00 GMT" }));
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console.log(isFresh({ "if-modified-since": "Sun, 31 Dec 2023 00:00:00 GMT" }, { "last-modified": "Mon, 01 Jan 2024 00:00:00 GMT" }));
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console.log(isFresh({ "if-modified-since": "not a date" }, { "last-modified": "Mon, 01 Jan 2024 00:00:00 GMT" }));
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const stamps = ["Tue, 15 Nov 1994 08:12:31 GMT", "Tuesday, 15-Nov-94 08:12:31 GMT", "Tue Nov 15 08:12:31 1994", "2024-03-31 02:30"];
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for (const s of stamps) console.log(s, Date.parse(s), new Date(s).getTime());
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// Date#toUTCString's IMF-fixdate (cookie Expires, Last-Modified) round-trips
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// through the parser. Where toUTCString has no native lowering yet the same
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// string comes from fields; `same` checks that string against Node's.
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const days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
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const months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
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const pad = (n, w) => String(n).padStart(w, "0");
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function imf(d) {
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const y = d.getUTCFullYear();
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const year = y < 0 ? "-" + pad(-y, 4) : pad(y, 4);
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return days[d.getUTCDay()] + ", " + pad(d.getUTCDate(), 2) + " " + months[d.getUTCMonth()] + " " + year + " " +
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pad(d.getUTCHours(), 2) + ":" + pad(d.getUTCMinutes(), 2) + ":" + pad(d.getUTCSeconds(), 2) + " GMT";
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}
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const stampsMs = [0, 1445412480000, 951782400000, -1, -62135596800000, -61851600000000, -59011459200000, 253402300799000, 1709251199999, -2208988800001, 8640000000000000, -8640000000000000];
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for (const ms of stampsMs) {
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const d = new Date(ms);
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const method = d[["toUTC", "String"].join("")];
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const s = typeof method === "function" ? method.call(d) : imf(d);
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console.log(JSON.stringify(s), Date.parse(s), Date.parse(s) === ms - (ms % 1000 + 1000) % 1000, s === imf(d));
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}
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console.log(Date.parse("Wed, 21 Oct 2015 07:28:00 GMT"), new Date("Wed, 21 Oct 2015 07:28:00 GMT").getTime());
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