130 lines
4.7 KiB
TypeScript
130 lines
4.7 KiB
TypeScript
const ID_SIZE = 24;
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const URLSafeCharacters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.~';
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export function unifySlug(slug: string | string[]): string
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{
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return (Array.isArray(slug) ? slug.join('/') : slug);
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}
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export function getID()
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{
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for (var id = [], i = 0; i < ID_SIZE; i++)
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id.push(URLSafeCharacters[URLSafeCharacters.length * Math.random() | 0]);
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return id.join("");
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}
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export function encodeBase(value: string): string
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{
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if(value === '')
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return '';
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const buffer = Buffer.from(value, 'utf8'), base = BigInt(URLSafeCharacters.length);
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let nb = BigInt('0x' + buffer.toHex()), result = [];
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while(nb > 0)
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{
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const remaining = nb % base;
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result.push(URLSafeCharacters[Number(remaining)]);
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nb = (nb - remaining) / base;
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}
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const text = result.reverse().join('');
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return text;
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}
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export function decodeBase(value: string): string
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{
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if(value === '')
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return '';
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const result = '', base = BigInt(URLSafeCharacters.length);
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let nb = BigInt(0);
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value.split('').forEach(e => nb = nb * base + BigInt(URLSafeCharacters.indexOf(e)));
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const text = Buffer.from(nb.toString(16), 'hex').toString('utf8');
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return text;
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}
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export function group<
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T,
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K extends keyof T,
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V extends keyof T,
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KeyType extends string | number | symbol = Extract<T[K], string | number | symbol>
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>(
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table: T[],
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key: K & (T[K] extends string | number | symbol ? K : never),
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value: V
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): Record<KeyType, T[V]> {
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return table.reduce((p, v) => {
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p[v[key] as KeyType] = v[value];
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return p;
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}, {} as Record<KeyType, T[V]>);
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}
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export function parsePath(path: string): string
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{
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return path.replace(/(\d+?)\. ?/g, '').toLowerCase().replaceAll(" ", "-").normalize("NFD").replaceAll(/[\u0300-\u036f]/g, "").replaceAll('(', '').replaceAll(')', '').replace(/\-+/g, '-');
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}
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export function parseId(id: string | undefined): string | undefined
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{
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return id;
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//return id?.normalize('NFD')?.replace(/[\u0300-\u036f]/g, '')?.replace(/^\d\. */g, '')?.replace(/\s/g, "-")?.replace(/%/g, "-percent")?.replace(/\?/g, "-q")?.toLowerCase();
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}
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export function padLeft(text: string, pad: string, length: number): string
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{
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return text.concat(pad.repeat(length - text.length));
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}
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export function padRight(text: string, pad: string, length: number): string
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{
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return pad.repeat(length - text.length).concat(text);
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}
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export function format(date: Date, template: string): string
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{
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const transforms: Record<string, (date: Date) => string> = {
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"yyyy": (date: Date) => date.getUTCFullYear().toString(),
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"MM": (date: Date) => padRight((date.getUTCMonth() + 1).toString(), '0', 2),
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"dd": (date: Date) => padRight(date.getUTCDate().toString(), '0', 2),
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"mm": (date: Date) => padRight(date.getUTCMinutes().toString(), '0', 2),
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"HH": (date: Date) => padRight(date.getUTCHours().toString(), '0', 2),
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"ss": (date: Date) => padRight(date.getUTCSeconds().toString(), '0', 2),
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};
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const keys = Object.keys(transforms);
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for(const key of keys)
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{
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template = key in transforms ? template.replaceAll(key, () => transforms[key]!(date)) : template;
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}
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return template;
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}
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export function clamp(x: number, min: number, max: number): number
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{
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return x > max ? max : x < min ? min : x;
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}
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export function lerp(x: number, a: number, b: number): number
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{
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return (1-x)*a+x*b;
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}
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// The value position is randomized
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// The metadata separator is randomized from the URLSafeCharacters set
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// The URI is (| == picked separator) |v_length|first part of the hash + value + second part of the hash|v_pos as hex.
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export function cryptURI(key: string, value: number): string
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{
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const hash = Bun.hash.crc32(key + value.toString()).toString(16);
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const pos = Math.floor(Math.random() * hash.length);
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const separator = URLSafeCharacters[URLSafeCharacters.length * Math.random() | 0]!;
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return encodeBase(separator + value.toString().length + separator + hash.substring(0, pos) + value + hash.substring(pos) + separator + pos);
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}
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export function decryptURI(uri: string, key: string): number | undefined
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{
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const _uri = decodeBase(uri);
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const separator = _uri.charAt(0);
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const length = parseInt(_uri.substring(1, _uri.indexOf(separator, 1)), 10);
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const pos = parseInt(_uri.substring(_uri.lastIndexOf(separator) + 1), 16);
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const _hash = _uri.substring(_uri.lastIndexOf(separator, _uri.length - pos.toString(16).length - 2) + 1, _uri.lastIndexOf(separator));
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const value = _hash.substring(pos, pos + length);
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const hash = _hash.substring(0, pos) + _hash.substring(pos + length);
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if(Bun.hash.crc32(key + value).toString(16) === hash)
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return parseInt(value, 10);
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else
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return undefined;
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} |