public inferImageType()

in source/image-handler/image-request.ts [384:407]

• 24 lines of code
• 9 McCabe index (conditional complexity)

  public inferImageType(imageBuffer: Buffer): string {
    const imageSignature = imageBuffer.slice(0, 4).toString('hex').toUpperCase();
    switch (imageSignature) {
      case '89504E47':
        return 'image/png';
      case 'FFD8FFDB':
      case 'FFD8FFE0':
      case 'FFD8FFEE':
      case 'FFD8FFE1':
        return 'image/jpeg';
      case '52494646':
        return 'image/webp';
      case '49492A00':
        return 'image/tiff';
      case '4D4D002A':
        return 'image/tiff';
      default:
        throw new ImageHandlerError(
          StatusCodes.INTERNAL_SERVER_ERROR,
          'RequestTypeError',
          'The file does not have an extension and the file type could not be inferred. Please ensure that your original image is of a supported file type (jpg, png, tiff, webp, svg). Refer to the documentation for additional guidance on forming image requests.'
        );
    }
  }