markdown-youtube

Adding Youtube video just like adding an Image.

![isyoutube](youtube link here)// it's that simple

For example, markdown-youtube will convert the following line virtually:

![isyoutube](https://www.youtube.com/watch?v=Wwp9eaVVW_8)

to:

<iframe src="https://www.youtube.com/embed/Wwp9eaVVW_8"></iframe>

Manage iframe height, width, border, margin, etc. using CSS. Something like:

iframe {
  width: 80%;
  height:350px;
  border: 0;
  margin: 0 auto;
  display:block;
}

Why use it?

You can't let your user to use IFrame for adding video in Markdown for Security reason.

In JavaScript

I've modified Pagedown's Markdown.Converter.js and Markdown.Sanitizer.js to Support Youtube video.

In PHP

I've also modified michelf's php-markdown Markdown Extra in markdown.php to Support Youtube video.

How does this work?

In JavaScript,

1. Check for isyoutube,
2. Given url characters are escaped,
3. Match Given url host to www.youtube.com,
4. Slice v's value from the URL,
5. Now place it inside '<iframe src="https://www.youtube.com/embed/'+value of v+'"></iframe>',
6. This iframe is sanitized in Markdown.Sanitizer.js. Just similar to img tag sanitization.

In Markdown.php you need to use Markdown Extra. The working process is almost same as in JavaScript except sanitization.

For Sanitization process I used HTMLPurifier.

 $config->set('HTML.Trusted', true);
 $config->set('Filter.YouTube', true);