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PhabricatorPDFDocumentEngine.php
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			<?php

			final class PhabricatorPDFDocumentEngine
			extends PhabricatorDocumentEngine {

			const ENGINEKEY = 'pdf';

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

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

			protected function canRenderDocumentType(PhabricatorDocumentRef $ref) {
			$viewable_types = PhabricatorEnv::getEnvConfig('files.viewable-mime-types');
			$viewable_types = array_keys($viewable_types);

			$pdf_types = array(
			'application/pdf',
			);

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

			protected function newDocumentContent(PhabricatorDocumentRef $ref) {
			$viewer = $this->getViewer();

			$file = $ref->getFile();
			if ($file) {
			$source_uri = $file->getViewURI();
			} else {
			throw new PhutilMethodNotImplementedException();
			}

			$name = $ref->getName();
			$length = $ref->getByteLength();

			$link = id(new PhabricatorFileLinkView())
			->setViewer($viewer)
			->setFileName($name)
			->setFileViewURI($source_uri)
			->setFileViewable(true)
			->setFileSize(phutil_format_bytes($length));

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

			return $container;
			}

			}