1
0
mirror of https://github.com/erusev/parsedown.git synced 2023-08-10 21:13:06 +03:00
Better Markdown Parser in PHP https://parsedown.org
Go to file
2019-04-07 17:34:40 +01:00
src Limit recursion depth by configurable 2019-04-07 17:34:40 +01:00
tests Limit recursion depth by configurable 2019-04-07 17:34:40 +01:00
.gitattributes Add .gitignore to export ignore in .gitattribtutes 2018-03-26 18:47:33 +01:00
.gitignore Cache spec locally for 5 minutes 2019-04-07 16:38:13 +01:00
.php_cs.dist Add some style cleanup rules already followed 2019-04-07 16:38:06 +01:00
.travis.yml Improve tests 2019-04-07 16:38:18 +01:00
composer.json Remove format error 2019-04-07 16:38:46 +01:00
infection.json.dist These classes of mutations would be caught be static analysis 2019-04-07 16:38:18 +01:00
LICENSE.txt Update LICENSE.txt 2018-01-01 14:09:31 +01:00
phpunit.xml.dist Add some component level tests 2019-04-07 16:38:17 +01:00
psalm.xml Improve tests 2019-04-07 16:38:18 +01:00
README.md Update README to match Travis breadth 2019-04-07 16:38:45 +01:00

Parsedown

Parsedown

Build Status Total Downloads Version License

Better Markdown Parser in PHP - Demo.

Features

Installation

Install the composer package:

composer require erusev/parsedown

Or download the latest release and include Parsedown.php

Example

$Parsedown = new Parsedown();

echo $Parsedown->text('Hello _Parsedown_!'); # prints: <p>Hello <em>Parsedown</em>!</p>

You can also parse inline markdown only:

echo $Parsedown->line('Hello _Parsedown_!'); # prints: Hello <em>Parsedown</em>!

More examples in the wiki and in this video tutorial.

Security

Parsedown is capable of escaping user-input within the HTML that it generates. Additionally Parsedown will apply sanitisation to additional scripting vectors (such as scripting link destinations) that are introduced by the markdown syntax itself.

To tell Parsedown that it is processing untrusted user-input, use the following:

$Parsedown->setSafeMode(true);

If instead, you wish to allow HTML within untrusted user-input, but still want output to be free from XSS it is recommended that you make use of a HTML sanitiser that allows HTML tags to be whitelisted, like HTML Purifier.

In both cases you should strongly consider employing defence-in-depth measures, like deploying a Content-Security-Policy (a browser security feature) so that your page is likely to be safe even if an attacker finds a vulnerability in one of the first lines of defence above.

Security of Parsedown Extensions

Safe mode does not necessarily yield safe results when using extensions to Parsedown. Extensions should be evaluated on their own to determine their specific safety against XSS.

Escaping HTML

⚠️  WARNING: This method isn't safe from XSS!

If you wish to escape HTML in trusted input, you can use the following:

$Parsedown->setMarkupEscaped(true);

Beware that this still allows users to insert unsafe scripting vectors, such as links like [xss](javascript:alert%281%29).

Questions

How does Parsedown work?

It tries to read Markdown like a human. First, it looks at the lines. Its interested in how the lines start. This helps it recognise blocks. It knows, for example, that if a line starts with a - then perhaps it belongs to a list. Once it recognises the blocks, it continues to the content. As it reads, it watches out for special characters. This helps it recognise inline elements (or inlines).

We call this approach "line based". We believe that Parsedown is the first Markdown parser to use it. Since the release of Parsedown, other developers have used the same approach to develop other Markdown parsers in PHP and in other languages.

Is it compliant with CommonMark?

It passes most of the CommonMark tests. Most of the tests that don't pass deal with cases that are quite uncommon. Still, as CommonMark matures, compliance should improve.

Who uses it?

Laravel Framework, Bolt CMS, Grav CMS, Herbie CMS, Kirby CMS, October CMS, Pico CMS, Statamic CMS, phpDocumentor, RaspberryPi.org, Symfony Demo and more.

How can I help?

Use it, star it, share it and if you feel generous, donate.