WP_REST_Attachments_Controller::create_item_permissions_check( WP_REST_Request $request ): true|WP_Error

Source

public function create_item_permissions_check( $request ) {
	$ret = parent::create_item_permissions_check( $request );

	if ( ! $ret || is_wp_error( $ret ) ) {
		return $ret;
	}

	if ( ! current_user_can( 'upload_files' ) ) {
		return new WP_Error(
			'rest_cannot_create',
			__( 'Sorry, you are not allowed to upload media on this site.' ),
			array( 'status' => 400 )
		);
	}

	// Attaching media to a post requires ability to edit said post.
	if ( ! empty( $request['post'] ) && ! current_user_can( 'edit_post', (int) $request['post'] ) ) {
		return new WP_Error(
			'rest_cannot_edit',
			__( 'Sorry, you are not allowed to upload media to this post.' ),
			array( 'status' => rest_authorization_required_code() )
		);
	}
	$files = $request->get_file_params();

	/**
	 * Filter whether the server should prevent uploads for image types it doesn't support. Default true.
	 *
	 * Developers can use this filter to enable uploads of certain image types. By default image types that are not
	 * supported by the server are prevented from being uploaded.
	 *
	 * @since 6.8.0
	 *
	 * @param bool        $check_mime Whether to prevent uploads of unsupported image types.
	 * @param string|null $mime_type  The mime type of the file being uploaded (if available).
	 */
	$prevent_unsupported_uploads = apply_filters( 'wp_prevent_unsupported_mime_type_uploads', true, isset( $files['file']['type'] ) ? $files['file']['type'] : null );

	// If the upload is an image, check if the server can handle the mime type.
	if (
		$prevent_unsupported_uploads &&
		isset( $files['file']['type'] ) &&
		str_starts_with( $files['file']['type'], 'image/' )
	) {
		// Check if the image editor supports the type.
		if ( ! wp_image_editor_supports( array( 'mime_type' => $files['file']['type'] ) ) ) {
			return new WP_Error(
				'rest_upload_image_type_not_supported',
				__( 'The web server cannot generate responsive image sizes for this image. Convert it to JPEG or PNG before uploading.' ),
				array( 'status' => 400 )
			);
		}
	}

	return true;
}

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