PhabricatorImageDocumentEngine.php
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	<?php

	final class PhabricatorImageDocumentEngine
	extends PhabricatorDocumentEngine {

	const ENGINEKEY = 'image';

	public function getViewAsLabel(PhabricatorDocumentRef $ref) {
	return pht('View as Image');
	}

	protected function getDocumentIconIcon(PhabricatorDocumentRef $ref) {
	return 'fa-file-image-o';
	}

	protected function getByteLengthLimit() {
	return (1024 * 1024 * 64);
	}

	protected function canRenderDocumentType(PhabricatorDocumentRef $ref) {
	$file = $ref->getFile();
	if ($file) {
	return $file->isViewableImage();
	}

	$viewable_types = PhabricatorEnv::getEnvConfig('files.viewable-mime-types');
	$viewable_types = array_keys($viewable_types);

	$image_types = PhabricatorEnv::getEnvConfig('files.image-mime-types');
	$image_types = array_keys($image_types);

	return
	$ref->hasAnyMimeType($viewable_types) &&
	$ref->hasAnyMimeType($image_types);
	}

	protected function newDocumentContent(PhabricatorDocumentRef $ref) {
	$file = $ref->getFile();
	if ($file) {
	$source_uri = $file->getViewURI();
	} else {
	// We could use a "data:" URI here. It's not yet clear if or when we'll
	// have a ref but no backing file.
	throw new PhutilMethodNotImplementedException();
	}

	$image = phutil_tag(
	'img',
	array(
	'src' => $source_uri,
	));

	$linked_image = phutil_tag(
	'a',
	array(
	'href' => $source_uri,
	'rel' => 'noreferrer',
	),
	$image);

	$container = phutil_tag(
	'div',
	array(
	'class' => 'document-engine-image',
	),
	$linked_image);

	return $container;
	}

	}