svg-sanitizer

This is my attempt at building a decent SVG sanitizer in PHP. The work is largely borrowed from DOMPurify.

Installation

Either require enshrined/svg-sanitize through composer or download the repo and include the old way!

Usage

Using this is fairly easy. Create a new instance of enshrined\svgSanitize\Sanitizer and then call the sanitize whilst passing in your dirty SVG/XML

Basic Example

use enshrined\svgSanitize\Sanitizer;

// Create a new sanitizer instance
$sanitizer = new Sanitizer();

// Load the dirty svg
$dirtySVG = file_get_contents('filthy.svg');

// Pass it to the sanitizer and get it back clean
$cleanSVG = $sanitizer->sanitize($dirtySVG);

// Now do what you want with your clean SVG/XML data

Output

This will either return a sanitized SVG/XML string or boolean false if XML parsing failed (usually due to a badly formatted file).

Options

You may pass your own whitelist of tags and attributes by using the Sanitizer::setAllowedTags and Sanitizer::setAllowedAttrs methods respectively.

These methods require that you implement the enshrined\svgSanitize\data\TagInterface or enshrined\svgSanitize\data\AttributeInterface.

Remove remote references

You have the option to remove attributes that reference remote files, this will stop HTTP leaks but will add an overhead to the sanitizer.

This defaults to false, set to true to remove references.

$sanitizer->removeRemoteReferences(true);

Viewing Sanitization Issues

You may use the getXmlIssues() method to return an array of issues that occurred during sanitization.

This may be useful for logging or providing feedback to the user on why an SVG was refused.

$issues = $sanitizer->getXmlIssues();

Minification

You can minify the XML output by calling $sanitizer->minify(true);.

Demo

There is a demo available at: http://svg.enshrined.co.uk/

WordPress

I've just released a WordPress plugin containing this code so you can sanitize your WordPress uploads. It's available from the WordPress plugin directory: https://wordpress.org/plugins/safe-svg/