33 lines
876 B
JavaScript
33 lines
876 B
JavaScript
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let canonicalBase32 = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
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let canonicalBase32Rev = {};
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for (let i = 0; i < canonicalBase32.length; ++i) {
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canonicalBase32Rev[canonicalBase32.charAt(i)] = i;
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}
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// Works on BigInt to support numbers larger than (1 << 31).
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function decodeCanonicalBase32(string) {
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let result = 0n;
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let cursor = 0b1n;
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for (let i = string.length - 1; i >= 0; --i) {
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result += cursor * BigInt(canonicalBase32Rev[string[i]]);
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cursor <<= 5n;
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}
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return result;
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}
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export function getTimestamp(ulid) {
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return new Date(Number(decodeCanonicalBase32(ulid.substring(0, 10))));
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}
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export function isCanonicalUlid(id) {
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if (id.length != 26) {
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return false;
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}
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for (let i = 0; i < id.length; ++i) {
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if (!canonicalBase32.includes(id.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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