Function sniffMimeType

packages/plugins/openapi/src/sdk/invoke.ts:439–469

(bytes: Uint8Array)

};

const sniffMimeType = (bytes: Uint8Array): string | null => {
  if (startsWithBytes(bytes, [0xff, 0xd8, 0xff])) return "image/jpeg";
  if (startsWithBytes(bytes, [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])) {
    return "image/png";
  }
  if (
    startsWithBytes(bytes, [0x47, 0x49, 0x46, 0x38, 0x37, 0x61]) ||
    startsWithBytes(bytes, [0x47, 0x49, 0x46, 0x38, 0x39, 0x61])
  ) {
    return "image/gif";
  }
  if (
    startsWithBytes(bytes, [0x52, 0x49, 0x46, 0x46]) &&
    bytes[8] === 0x57 &&
    bytes[9] === 0x45 &&
    bytes[10] === 0x42 &&
    bytes[11] === 0x50
  ) {
    return "image/webp";
  }
  if (startsWithBytes(bytes, [0x25, 0x50, 0x44, 0x46, 0x2d])) return "application/pdf";
  if (
    startsWithBytes(bytes, [0x50, 0x4b, 0x03, 0x04]) ||
    startsWithBytes(bytes, [0x50, 0x4b, 0x05, 0x06]) ||
    startsWithBytes(bytes, [0x50, 0x4b, 0x07, 0x08])
  ) {
    return "application/zip";
  }
  if (isLikelyUtf8Text(bytes)) return "text/plain";
  return null;
};

const bytesFromBase64Prefix = (base64: string): Uint8Array => {
  const prefix = base64.slice(0, Math.min(base64.length, 64));