@wordpress/upload-media/build-module/validate-mime-type.js

Core media upload logic.

/**
 * WordPress dependencies
 */
import { __, sprintf } from '@wordpress/i18n';

/**
 * Internal dependencies
 */
import { UploadError } from './upload-error';

/**
 * Verifies if the caller (e.g. a block) supports this mime type.
 *
 * @param file         File object.
 * @param allowedTypes List of allowed mime types.
 */
export function validateMimeType(file, allowedTypes) {
  if (!allowedTypes) {
    return;
  }

  // Allowed type specified by consumer.
  const isAllowedType = allowedTypes.some(allowedType => {
    // If a complete mimetype is specified verify if it matches exactly the mime type of the file.
    if (allowedType.includes('/')) {
      return allowedType === file.type;
    }
    // Otherwise a general mime type is used, and we should verify if the file mimetype starts with it.
    return file.type.startsWith(`${allowedType}/`);
  });
  if (file.type && !isAllowedType) {
    throw new UploadError({
      code: 'MIME_TYPE_NOT_SUPPORTED',
      message: sprintf(
      // translators: %s: file name.
      __('%s: Sorry, this file type is not supported here.'), file.name),
      file
    });
  }
}
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