64 lines
1.7 KiB
TypeScript
64 lines
1.7 KiB
TypeScript
import z from "zod";
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const XOR_CODE = 23442827791579n;
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const MASK_CODE = 2251799813685247n;
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const MAX_AID = 1n << 51n;
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const BASE = 58n;
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const data = "FcwAPNKTMug3GV5Lj7EJnHpWsx4tb8haYeviqBz6rkCy12mUSDQX9RdoZf";
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export function av2bv(aid: number) {
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const bytes = ["B", "V", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0"];
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let bvIndex = bytes.length - 1;
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let tmp = (MAX_AID | BigInt(aid)) ^ XOR_CODE;
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while (tmp > 0) {
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bytes[bvIndex] = data[Number(tmp % BigInt(BASE))];
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tmp = tmp / BASE;
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bvIndex -= 1;
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}
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[bytes[3], bytes[9]] = [bytes[9], bytes[3]];
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[bytes[4], bytes[7]] = [bytes[7], bytes[4]];
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return bytes.join("") as `BV1${string}`;
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}
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export function bv2av(bvid: `BV1${string}`) {
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const bvidArr = Array.from<string>(bvid);
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[bvidArr[3], bvidArr[9]] = [bvidArr[9], bvidArr[3]];
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[bvidArr[4], bvidArr[7]] = [bvidArr[7], bvidArr[4]];
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bvidArr.splice(0, 3);
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const tmp = bvidArr.reduce((pre, bvidChar) => pre * BASE + BigInt(data.indexOf(bvidChar)), 0n);
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return Number((tmp & MASK_CODE) ^ XOR_CODE);
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}
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const BV_REGEX = /^BV1[1-9A-HJ-NP-Za-km-z]{9}$/;
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const bvSchema = z.string().regex(BV_REGEX);
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const AV_REGEX = /^av[0-9]+$/;
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const avSchema = z.string().regex(AV_REGEX);
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export function detectBiliID(id: string) {
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if (bvSchema.safeParse(id).success) {
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return {
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type: "bv" as const,
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id: id as `BV1${string}`
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};
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} else if (avSchema.safeParse(id).success) {
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return {
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type: "av" as const,
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id: id as `av${string}`
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};
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}
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return null;
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}
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export function biliIDToAID(id: string) {
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const detected = detectBiliID(id);
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if (!detected) {
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return null;
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}
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if (detected.type === "bv") {
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return bv2av(detected.id);
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} else {
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return Number.parseInt(detected.id.slice(2));
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}
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}
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