100 lines
3.6 KiB
Markdown
100 lines
3.6 KiB
Markdown
# ProcessWire SVG Sanitizer
|
|
|
|
## A FileValidator module for ProcessWire 3.x
|
|
|
|
Installation of this module is recommended if using SVG file uploads
|
|
in ProcessWire, as SVG files can easily contain malicious code. On the other hand,
|
|
if you do not need SVG file uploads then you should simply prevent their use by
|
|
never adding "svg" as a file extension to your file/image fields.
|
|
|
|
When installed, this module will automatically sanitize SVG files uploaded to file
|
|
or image fields in ProcessWire (InputfieldFile and InputfieldImage). It will also
|
|
apply to anything else that calls the `$sanitizer->validateFile()` API method.
|
|
|
|
This module does not guarantee that SVG files are safe, but it does help to
|
|
significantly reduce the risks associated with SVG files by sanitizing them from
|
|
known problematic tabs and attributes that can be present in SVG files. If you
|
|
want to be 100% safe then do not allow SVG file uploads at all.
|
|
|
|
The FileValidatorModule interface and this module file are MIT licensed,
|
|
while the svg-sanitizer library in the /svgSanitize/ dir is GPL 2.0.
|
|
As a result, if your usage does not support GPL code, you should inquire with
|
|
the developer of the sanitizer lib before using this module in your project:
|
|
<https://github.com/darylldoyle>
|
|
|
|
This module was developed by @adrianbj and @ryancramerdesign in 2015 and updated
|
|
in 2020 to replace the existing SVG library with a more up-to-date version located
|
|
at: <https://github.com/darylldoyle/svg-sanitizer>
|
|
|
|
|
|
## Requirements
|
|
|
|
- ProcessWire 3.0.148 or newer (3.0.164+ recommended).
|
|
- PHP must have the "dom" and "libxml" extensions (most already do).
|
|
|
|
|
|
## Install
|
|
|
|
1. Copy all of the files for this module into a new directory named:
|
|
`/site/modules/FileValidatorSvgSanitizer/`
|
|
2. In your ProcessWire admin, navigate to: “Modules > Refresh”
|
|
3. Click “Install” for module “SVG File Sanitizer/Validator”.
|
|
|
|
|
|
## Upgrade
|
|
|
|
To upgrade the module, remove your old FileValidatorSvgSanitizer directory
|
|
(or hide it by placing a period in front of it) and then follow steps 1
|
|
and 2 of the Install directions above.
|
|
|
|
Because of the SVG library change, please note the following feature changes
|
|
in version 2+ relative to version 1:
|
|
|
|
1. It does not use a `$config->FileValidatorSvgSanitizer` config array.
|
|
2. Whitelists of tags and attributes are configurable in module settings.
|
|
3. It only rejects SVG files that cannot be made valid through sanitization.
|
|
4. Sanitization seems to be quite a bit better than the previous.
|
|
5. It optionally includes the ability to minify whitespace in an SVG file.
|
|
6. It performs more verbose logging of issues in the file-validator log.
|
|
|
|
|
|
## General usage
|
|
|
|
This module is used automatically on any SVG files uploaded to file or image
|
|
fields in ProcessWire that use InputfieldFile or InputfieldImage. It is also
|
|
used on any SVG files passed to `$sanitizer->validateFile()`.
|
|
|
|
Activity for this module can be found in “Setup > Logs > File-validator”.
|
|
It logs any issues it identifies and cleans out of SVG files.
|
|
|
|
## API usage
|
|
|
|
To use the module directly:
|
|
~~~~~
|
|
$validator = $modules->get('FileValidatorSvgSanitizer');
|
|
$result = $validator->isValid('/path/to/file.svg');
|
|
|
|
if($result === true) {
|
|
// true: file is valid as-is
|
|
} else if($result) {
|
|
// 1: file was made valid through sanitization
|
|
} else {
|
|
// false: file is not valid svg
|
|
}
|
|
~~~~~
|
|
To use the module through the `$sanitizer` API var, you can validate
|
|
in the same way as any other file type:
|
|
~~~~~
|
|
$result = $sanitizer->validateFile('/path/to/file.svg');
|
|
|
|
if($result === null) {
|
|
// null: no FileValidator module available for given file type
|
|
} else if($result) {
|
|
// true: file is valid or was made valid
|
|
} else {
|
|
// false: file is not valid
|
|
}
|
|
~~~~~
|
|
|
|
|
|
|