[wp-kama embed] https://wp-kama.com/2017 Allow Upload SVG for WordPress

Allow_SVG_Upload.php

<?php

/**
 * Allow uploading svg webp file types
 *
 * @version 1.1
 */
final class Allow_SVG_Upload {

	public static function init(): void {

		// Allow file types to be uploaded
		add_filter( 'upload_mimes', [ __CLASS__, 'upload_allow_types' ] );
		add_filter( 'wp_check_filetype_and_ext', [ __CLASS__, 'fix_svg_mime_type' ], 10, 5 );
		add_filter( 'wp_prepare_attachment_for_js', [ __CLASS__, 'show_svg_in_media_library' ] );

		add_filter( 'wp_handle_sideload_prefilter', [ __CLASS__, 'check_upload_file_size' ] );
		add_filter( 'wp_handle_upload_prefilter', [ __CLASS__, 'check_upload_file_size' ] );

		add_filter( 'getimagesize_mimes_to_exts', [ __CLASS__, 'more_mimes_to_exts' ] );
		add_filter( 'image_sideload_extensions', [ __CLASS__, 'more_image_sideload_extensions' ] );
	}

	public static function upload_allow_types( $mimes ){

		if( current_user_can( 'upload_files' ) ){
			$mimes['svg']  = 'image/svg+xml';
		}

		$mimes['webp'] = 'image/webp';

		// deactivate existing
		unset( $mimes['mp4a'] );

		return $mimes;
	}

	public static function more_image_sideload_extensions( $allowed ){
		$allowed[] = 'svg';

		return $allowed;
	}

	public static function more_mimes_to_exts( $mime_to_ext ){
		$mime_to_ext['image/webp'] = 'webp';

		return $mime_to_ext;
	}

	public static function fix_svg_mime_type( $data, $file, $filename, $mimes, $real_mime = '' ){

		// WP 5.1 +
		if( version_compare( $GLOBALS['wp_version'], '5.1.0', '>=' ) ){
			$dosvg = in_array( $real_mime, [ 'image/svg', 'image/svg+xml' ] );
		}
		else{
			$dosvg = ( '.svg' === strtolower( substr( $filename, -4 ) ) );
		}

		// mime type was reset, let's fix it
		// and also check file size and user permissions
		if( $dosvg ){
			if( current_user_can( 'upload_files' ) ){
				$data['ext']  = 'svg';
				$data['type'] = 'image/svg+xml';
			}
			// prohibit
			else {
				$data['ext'] = $type_and_ext['type'] = false;
			}
		}

		return $data;
	}

	/**
	 * Generates data for displaying SVGs as images in the media library.
	 */
	public static function show_svg_in_media_library( $response ) {

		if ( $response['mime'] === 'image/svg+xml' ) {
			$response['sizes'] = [
				'medium' => [
					'url' => $response['url'],
				],
				// when editing a image
				'full' => [
					'url' => $response['url'],
				],
			];
		}

		return $response;
	}

	/**
	 * Limit the size of uploaded files by type
	 */
	public static function check_upload_file_size( $file ){

		if( ! $file ){
			return $file;
		}

		// for SVG
		if( str_contains( ( $file['type'] ?? '' ), 'image/svg+xml' ) ){
			$size_limit = 500 * 1024; // max size in KB

			if( (int) $file['size'] > $size_limit ){
				$file['error'] = sprintf(
					__( 'ERROR: Размер этого типа файлов не может превышать %s', 'km' ),
					size_format( $size_limit )
				);
			}
		}

		return $file;
	}

}