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View source for Re: Open Graph protocol integration

The ##file_link## table tracks all used files of a page.
The ##external_link## table tracks analog external images.

**How and where you want determine the image you wanna use?** Guess this is the main question, the rest is just code. So we can for example  parse / set a file_id as metadata into the page table.

This can be integrated in the properties or attachments handler. On the other hand you can add a additional ##og## table and handler, totally independent from the core application. 

/theme/_common/_header.php
%%
	$tpl->og_title		= $this->page['title'];
	$tpl->og_type		= 'article';
	$tpl->og_url		= $this->href('', $this->tag, null, null, null, null, null, true);
	$tpl->og_image		= $this->page['image'];
	$tpl->og_description	= $this->page['description'] ?? null;
%%
/theme/_common/_header.tpl
%%
	[= og _ =
		<meta property="og:title" content="[ ' title | e ' ]">
		<meta property="og:site_name" content="[ ' db: site_name | e ' ]">
		<meta property="og:type" content="[ ' type | e ' ]">
		<meta property="og:url" content="[ ' url | e ' ]">
		<meta property="og:image" content="[ ' image | e ' ]">
		<meta property="og:description" content="[ ' description | e ' ]">
	=]
%%