svg-scanner.php

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#!/usr/bin/env php
<?php
 
/*
 * Simple program that uses svg-sanitizer
 * to find issues in files specified on the
 * command line, and prints a JSON output with
 * the issues found on exit.
 */
 
require_once( __DIR__ . '/data/AttributeInterface.php' );
require_once( __DIR__ . '/data/TagInterface.php' );
require_once( __DIR__ . '/data/AllowedAttributes.php' );
require_once( __DIR__ . '/data/AllowedTags.php' );
require_once( __DIR__ . '/Sanitizer.php' );
 
 
/*
 * Print array as JSON and then
 * exit program with a particular
 * exit-code.
 */
 
function sysexit(
        $results,
        $status
) {
        echo json_encode(
                $results,
                JSON_PRETTY_PRINT
        );
 
        exit( $status );
}
 
 
/*
 * Main part begins
 */
 
global $argv;
 
/*
 * Set up results array, to
 * be printed on exit.
 */
$results = array(
        'totals' => array(
                'errors' => 0,
        ),
 
        'files' => array(
        ),
);
 
 
/*
 * Catch files to scan from $argv.
 */
 
$files_to_scan = $argv;
unset( $files_to_scan[0] );
 
$files_to_scan = array_values(
        $files_to_scan
);
 
/*
 * Catch no file specified.
 */
 
if ( empty( $files_to_scan ) ) {
        $results['totals']['errors']++;
        $results['messages'] = array(
                array( 'No files to scan specified' ),
        );
 
        sysexit(
                $results,
                1
        );
}
 
/*
 * Initialize the SVG scanner.
 *
 * Make sure to allow custom attributes,
 * and to remove remote references.
 */
$sanitizer = new enshrined\svgSanitize\Sanitizer();
 
$sanitizer->removeRemoteReferences( true );
 
/*
 * Scan each file specified to be scanned.
 */
 
foreach( $files_to_scan as $file_name ) {
        /*
         * Read SVG file.
         */
        $svg_file = @file_get_contents( $file_name );
 
        /*
         * If not found, report that and continue.
         */
        if ( false === $svg_file ) {
                $results['totals']['errors']++;
 
                $results['files'][ $file_name ][] = array(
                        'errors' => 1,
                        'messages' => array(
                                array(
                                        'message' => 'File specified could not be read (' . $file_name . ')',
                                        'line' => null,
                                ),
                        ),
                );
 
                continue;
        }
 
        /*
         * Sanitize file and get issues found.
         */
        $sanitize_status = $sanitizer->sanitize( $svg_file );
 
        $xml_issues = $sanitizer->getXmlIssues();
 
        /*
         * If we find no issues, simply note that.
         */
        if ( empty( $xml_issues ) && ( false !== $sanitize_status ) ) {
                $results['files'][ $file_name ] = array(
                        'errors' => 0,
                        'messages' => array()
                );
        }
 
        /*
         * Could not sanitize the file.
         */
        else if (
                ( '' === $sanitize_status ) ||
                ( false === $sanitize_status )
        ) {
                $results['totals']['errors']++;
 
                $results['files'][ $file_name ] = array(
                        'errors' => 1,
                        'messages' => array(
                                array(
                                        'message' => 'Unable to sanitize file \'' . $file_name . '\'' ,
                                        'line' => null,
                                )
                        ),
                );
        }
 
        /*
         * If we find issues, note it and update statistics.
         */
 
        else {
                $results['totals']['errors'] += count( $xml_issues );
 
                $results['files'][ $file_name ] = array(
                        'errors' => count( $xml_issues ),
                        'messages' => $xml_issues,
                );
        }
 
        unset( $svg_file );
        unset( $xml_issues );
        unset( $sanitize_status );
}
 
 
/*
 * Exit with a status
 * that reflects what issues
 * we found.
 */
sysexit(
        $results,
        ( $results['totals']['errors'] === 0 ? 0 : 1 )
);