bigbuffet-rw/packages/pl-api/lib/entities/utils.ts

import * as v from 'valibot';

/** Validate to Mastodon's date format, or use the current date. */
const dateSchema = z.string().datetime({ offset: true }).catch(new Date().toUTCString());

/** Validates individual items in an array, dropping any that aren't valid. */
const filteredArray = <T extends z.ZodTypeAny>(schema: T) =>
  z.any().array().catch([])
    .transform((arr) => (
      arr.map((item) => {
        const parsed = schema.safeParse(item);
        return parsed.success ? parsed.data : undefined;
      }).filter((item): item is v.InferOutput<T> => Boolean(item))
    ));

/** Validates the string as an emoji. */
const emojiSchema = v.pipe(v.string(), v.emoji());

/** MIME schema, eg `image/png`. */
const mimeSchema = v.pipe(v.string(), v.regex(/^\w+\/[-+.\w]+$/));

/** valibot schema to force the value into an object, if it isn't already. */
const coerceObject = <T extends v.ObjectEntries>(shape: T) =>
  v.pipe(
    v.any(),
    v.transform((input) => typeof input === 'object' ? input : {}),
    v.object(shape),
  );

export { filteredArray, emojiSchema, dateSchema, mimeSchema, coerceObject };