imageTypeBasedOnIpfsCid.ts

import axios from 'axios';
import { fromBuffer } from 'file-type';
import { equals, includes, isEmpty, isNil, last, split } from 'ramda';
/**
 * Checks is the payload image and if it is will also check do we need to process it, the searchParams are not empty. Internally this method will fetch the minimum amount of bytes (4100) using the Range header and try to determine the mime type.
 *
 * Example:
 *
 * ```ts
 * // this will return false because it doesn't have the searchParams
 * url = 'ipfs/bafykCID/image1.png'
 *
 * // this will return true because it has the searchParams
 * url = 'ipfs/bafykCID/image1.png?w=100'
 * ```
 * @param url -
 * @param queryParams -
 * @returns
 */
export async function imageTypeBasedOnIpfsCid(
  url: URL,
  queryParams: Record<string, unknown>
): Promise<{ process: boolean; cid: string }> {
  // @TODO maybe use .head and diff response type
  const c = await axios.get(url.toString(), {
    responseType: 'arraybuffer',
    // get first minimum amount of bytes to see is it image or not
    headers: { Range: `bytes=0-${minimumBytes}` }
  });

  const mimeT = await fromBuffer(c.data);

  const res = {
    mime: mimeT.mime,
    cid: last(split(',', c.headers['x-ipfs-roots'])) as string
  };
  return res;
}