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	diff --git a/src/controller/DiagramController.php b/src/controller/DiagramController.php
	index 4508f02..65220bf 100644
	--- a/src/controller/DiagramController.php
	+++ b/src/controller/DiagramController.php
	@@ -1,947 +1,947 @@
	<?php
	final class DiagramController extends PhabricatorController {
	/**
	* Processes incoming HTTP requests from Diagram application
	*/
	public function handleRequest(AphrontRequest $request) {

	$this->setRequest($request);

	// detetermine if GET or POST HTTP call
	if ($request->isHTTPPost()) {
	// process POST calls (like save action)
	return $this->handleHttpPostCall($request);
	}

	// determine type of URL by means of DiagramApplication route parameters
	$diagramphid = $request->getURIData('diagramphid');
	$diagramid = $request->getURIData('diagramid');
	$versioneddiagramid = $request->getURIData('versioneddiagramid');
	$version = $request->getURIData('version');
	$route = $request->getURIData('route');
	$versioninfoDiagramID = $request->getURIData('versioninfodiagram');
	$versioninfoPage = $request->getURIData('versioninfopage');
	$loadDiagramName = $request->getURIData('loadDiagramName');
	$loadDiagramPHID = $request->getURIData('loadDiagramPHID');
	$loadDiagramVersion = $request->getURIData('loadDiagramVersion');

	if (isset($diagramphid) && !empty(trim($diagramphid))) {
	// return PNG image data
	$diagram = id(new DiagramVersion())->loadByDiagramPHID($diagramphid);
	if ($diagram !== null) {
	$response = new AphrontFileResponse();
	$response->setMimeType('image/png');
	$response->setContent($diagram->getData());
	return $response;
	}
	}


	if (isset($versioninfoDiagramID) && !empty(trim($versioninfoDiagramID))) {
	// return diagram version info
	if (!isset($versioninfoPage) \|\| empty(trim($versioninfoPage))) {
	// versioninfoPage was dismissed -> initialize to 1
	$versioninfoPage = "1";
	}

	$diagramVersions = id(new DiagramVersion())->loadByDiagramID(
	$versioninfoDiagramID);

	if ($diagramVersions !== null) {
	$result = [];
	$viewer = $request->getViewer();

	// determine total count of versions
	$totalcount = count($diagramVersions);

	// filter out some of the versions we want to show
	$pageSize = 10;
	$diagramVersions = array_slice($diagramVersions,
	($versioninfoPage - 1) * $pageSize,
	$pageSize
	);

	// calculate number of pages
	$totalpages = ceil($totalcount / $pageSize);

	// create menu-items
	foreach ($diagramVersions as $diagramVersion) {
	$author = $diagramVersion->getAuthorPHID();

	$user = id(new PhabricatorPeopleQuery())
	->setViewer($viewer)
	->withPHIDs(array(
	$author
	))
	->executeOne();

	$dateModified = $diagramVersion->getDateModified();

	$result[] = array(
	"id" => $diagramVersion->getVersion(),
	"datetime" => phabricator_datetime($dateModified, $viewer),
	"author" => $user->getUsername()
	);
	}

	// reply back
	$response = id(new AphrontJSONResponse())->setAddJSONShield(false)
	->setContent(array(
	"data" => $result,
	"pagecount" => $totalpages,
	"nopager" => $totalcount <= $pageSize
	));
	return $response;
	} else {
	// version info requested for inexistant diagram
	$response = id(new AphrontJSONResponse())->setAddJSONShield(false)
	->setContent(array(
	"data" => array(),
	"pagecount" => 0
	));
	return $response;
	}
	}

	if ($route == 'loadJsExtension') {
	$response = new AphrontFileResponse();
	$response->setMimeType('application/javascript');

	$base64_data = "";
	if (isset($loadDiagramName) && !empty(trim($loadDiagramName))) {
	$diagram_id = (int) substr($loadDiagramName, strlen("DIAG"));
	if (isset($loadDiagramVersion) && !empty(trim($loadDiagramVersion))) {
	$diagramVersion = id(new DiagramVersion())->loadByVersionedDiagramID(
	$diagram_id,
	$loadDiagramVersion);
	} else {
	$diagramVersion = id(new DiagramVersion())->loadLatestByDiagramID(
	$diagram_id);
	}
	if ($diagramVersion) {
	$data = $diagramVersion->getData();
	$base64_data = base64_encode($data);
	}
	}

	$response->setContent('loadJsExtension("'
	. $loadDiagramName
	. '", "'
	. $loadDiagramPHID
	. '", "'
	. $loadDiagramVersion
	. '", "'
	. $base64_data
	. '");');
	return $response;
	}

	$root = '';
	$file = rtrim($request->getPath(), '/');
	$root = dirname(phutil_get_library_root('diagram'));

	// determine from which application area the file should be loaded:
	// 1) Phorge extension source
	// or 2) drawio source
	if ($route == 'iframe') {
	// load from drawio source
	if ($file == '/diagram/iframe')
	$file .= '/index.html';
	if ($versioneddiagramid != null && $version != null) {
	$file = preg_replace(
	"/^\/diagram\/$versioneddiagramid\/$version" ."iframe\//",
	"data/drawio/src/main/webapp/",
	$file);
	} else {
	$file = preg_replace("/^\/diagram\/($diagramid\/?)?iframe\//",
	"data/drawio/src/main/webapp/",
	$file);
	}
	} else {
	// load from extension source
	if (rtrim($file, '/') == '/diagram') {
	return $this->showApplication($request);
	}

	if ($versioneddiagramid !== null && $version !== null) {
	$file = preg_replace(
	'/^\/diagram\/' . $versioneddiagramid . '\/'. $version . '\/?/',
	'data/',
	$file
	);
	$file = rtrim($file, '/') . '/' . $versioneddiagramid;
	} else {
	$file = preg_replace(
	'/^\/diagram\/(' . $diagramid . '\/)?/',
	'data/',
	$file
	);
	}
	}

	// check if we are trying to load "iframe loader" files,
	// if so, correct the path accordingly
	if ($file == "data/drawio/src/main/webapp/index.html") {
	return $this->showIframe($request);
	}
	else
	if ($file == "data/drawio/src/main/webapp/iframe.css"
	\|\| $file == "data/drawio/src/main/webapp/iframe-toolbtn.css"
	\|\| $file == "data/drawio/src/main/webapp/iframe1.js"
	\|\| $file == "data/drawio/src/main/webapp/iframe2.js"
	\|\| $file == "data/drawio/src/main/webapp/iframe-toolbtn.js") {
	$file = str_replace("drawio/src/main/webapp/", "", $file);
	}

	// determine full path
	$path = $root . '/' . $file;

	if (file_exists($path) == false \|\| is_readable($path) == false) {
	if (preg_match('/^data\/DIAG(\d+)$/', $file, $matches)) {
	$diagram_id = (int) $matches[1];
	if ($version === null) {
	$diagramVersion = id(new DiagramVersion())->loadLatestByDiagramID(
	$diagram_id);
	} else {
	$diagramVersion = id(new DiagramVersion())->loadByVersionedDiagramID(
	$diagram_id, $version);
	}
	if ($diagramVersion) {
	$data = $diagramVersion->getData();
	$base64_data = base64_encode($data);

	$diagram = id(new Diagram())->loadByID($diagram_id);

	return $this->showApplication(
	$request,
	'DIAG' . $diagram_id,
	$diagram->getPHID(),
	$version ?? "",
	$base64_data
	);
	}
	}

	// Invalid URL
	$response = id(new Aphront404Response());
	return $response;
	} else {
	// process Iframe content
	switch (pathinfo($file, PATHINFO_EXTENSION)) {
	case 'html':
	$response = id(new PlainHtmlWebpageResponse())
	->setFrameable(true)
	->setContent(file_get_contents($path));
	break;
	case 'js':
	$response = new AphrontFileResponse();
	$response->setMimeType('application/javascript');
	break;
	case 'css':
	$response = new AphrontFileResponse();
	$response->setMimeType('text/css');
	break;
	case 'txt':
	$response = new AphrontFileResponse();
	$response->setMimeType('text/plain');
	break;
	case 'png':
	$response = new AphrontFileResponse();
	$response->setMimeType('image/png');
	break;
	case 'gif':
	$response = new AphrontFileResponse();
	$response->setMimeType('image/gif');
	break;
	case 'jpg':
	case 'jpeg':
	$response = new AphrontFileResponse();
	$response->setMimeType('image/jpeg');
	break;
	default:
	$response = new AphrontFileResponse();
	$response->setMimeType('application/octet-stream');
	break;
	}
	try {
	$response->setContent(file_get_contents($path));
	} catch (Exception $e) {
	$response->setContent($route);
	}
	return $response;
	}
	}

	/**
	* Compares the draw.io tEXt metadata from 2 PNG base64 strings.
	* The content looks like this:
	* <mxfile host="..." modified="..." agent="..." etag="..." version="..."...>
	* <diagram id="O253AQcHVgjdl_wygdBA" name="Page-1">
	* <mxGraphModel ...>
	* <root>
	* ...
	* </mxCell>
	* </root>
	* </mxGraphModel>
	* </diagram>
	* </mxfile>
	*
	* The modified and etag attributes of mxfile will always be different.
	* They are cut out before the 2 strings are compared.
	*/
	public static function equalPngMetaData($base64_1, $base64_2) {
	$base64 = array($base64_1, $base64_2);
	$textData = array();
	for ($i = 0; $i < 2; $i++) {
	$data = base64_decode($base64[$i]);
	$fp = fopen('data://text/plain;base64,' . base64_encode($data), 'rb');
	$sig = fread($fp, 8);
	if ($sig != "\x89PNG\x0d\x0a\x1a\x0a") {
	fclose($fp);
	return false;
	}
	$textData[$i] = array();
	while (!feof($fp)) {
	try {
	$chunk = unpack('Nlength/a4type', fread($fp, 8));
	} catch (Exception $e) {
	// invalid base64 data
	return false;
	}
	if ($chunk['type'] == 'IEND') break;
	if ($chunk['type'] == 'tEXt') {
	list($key, $val) = explode("\0", fread($fp, $chunk['length']));
	if ($key == 'mxfile') {
	// Decode the URL-encoded XML data
	$decodedVal = urldecode($val);
	// Load the XML and remove the modified and etag attributes
	$xml = simplexml_load_string($decodedVal);
	unset($xml->attributes()->modified);
	unset($xml->attributes()->etag);
	// Save the modified XML as the value
	$val = $xml->asXML();
	}
	$textData[$i][$key] = $val;
	fseek($fp, 4, SEEK_CUR);
	} else {
	fseek($fp, $chunk['length'] + 4, SEEK_CUR);
	}
	}
	fclose($fp);
	}

	if (isset($textData[0]['mxfile']) && isset($textData[1]['mxfile'])) {
	// Both arrays contain the mxfile key, compare their values
	return $textData[0]['mxfile'] == $textData[1]['mxfile'];
	} else {
	// At least one of the arrays doesn't contain mxfile key, return false
	return false;
	}
	}

	/**
	* Processes HTTP POST calls from Diagram application, like 'Save' action
	*/
	private function handleHttpPostCall(AphrontRequest $request) {
	$subscriptionphid = $request->getURIData('subscriptionphid');

	if (isset($subscriptionphid) && !empty(trim($subscriptionphid))) {
	// get list of subscriber for specified diagram phid
	$subscribers = PhabricatorSubscribersQuery::loadSubscribersForPHID(
	$subscriptionphid);

	// verify if viewer is subscriber
	$viewer = $request->getViewer();
	if ($viewer == null) {
	$isSubscribed = false;
	} else {
	$isSubscribed = in_array($viewer->getPHID(),$subscribers);
	}

	// reply back
	$response = id(new AphrontJSONResponse())->setAddJSONShield(false)
	->setContent(array(
	"subscribed" => $isSubscribed
	));
	return $response;
	}

	$base64_data = $request->getStr("data");
	$diagram_id = $request->getStr("diagramID");

	// cut off "data:image/png;base64,"
	$base64_data = substr($base64_data, strpos($base64_data, ',') + 1);

	if ($diagram_id != "") {
	// check if we are trying to save the same data as the current data
	$diagram = id(new DiagramVersion())->loadLatestByDiagramID($diagram_id);
	if ($diagram !== null) {
	$data = $diagram->getData();
	$old_data = base64_encode($data);

	if (DiagramController::equalPngMetaData($base64_data, $old_data)) {
	// data hasn't been modified
	// => do not create new version
	$response = id(new AphrontJSONResponse())->setAddJSONShield(false)
	->setContent(array(
	"Status" => "OK",
	"DiagramID" => $diagram->getDiagramID(),
	"Version" => $diagram->getVersion()
	));
	return $response;
	}
	}
	}

	// Set the options for the new file
	$options = array(
	'name' => 'diagram.png',
	'viewPolicy' => PhabricatorPolicies::POLICY_USER,
	'mime-type' => 'image/png',
	'actor' => $this->getViewer(),
	'diagramID' => $diagram_id
	);

	try {
	// Create the new file object
	$diagram = DiagramVersion::newFromFileData($base64_data, $options);

	$diagram->publishNewVersion($request, $diagram->getDiagramID());

	$response = id(new AphrontJSONResponse())->setAddJSONShield(false)
	->setContent(array(
	"Status" => "OK",
	"DiagramID" => $diagram->getDiagramID(),
	"Version" => $diagram->getVersion()
	));
	return $response;
	} catch (Exception $e) {
	$response = id(new AphrontJSONResponse())->setAddJSONShield(false)
	->setContent(array(
	"Status" => "ERROR",
	"Error" => $e->getMessage(),
	));
	return $response;
	}
	}

	/**
	* Verifies if the given base64 data is draw.io compatible
	*/
	public static function isDrawioPngBase64($base64) {
	$data = base64_decode($base64);
	$fp = fopen('data://text/plain;base64,' . base64_encode($data), 'rb');
	$sig = fread($fp, 8);
	if ($sig != "\x89PNG\x0d\x0a\x1a\x0a") {
	fclose($fp);
	return false;
	}
	while (!feof($fp)) {
	try {
	$chunk = unpack('Nlength/a4type', fread($fp, 8));
	} catch (Exception $e) {
	// invalid base64 data
	return false;
	}
	if ($chunk['type'] == 'IEND') break;
	if ($chunk['type'] == 'tEXt') {
	list($key, $val) = explode("\0", fread($fp, $chunk['length']));
	if ($key == 'mxfile') {
	fclose($fp);
	return true;
	}
	fseek($fp, 4, SEEK_CUR);
	} else {
	fseek($fp, $chunk['length'] + 4, SEEK_CUR);
	}
	}
	fclose($fp);
	return false;
	}

	/**
	* Shows the draw.io application integrated in Phorge's layout
	*/
	private function showApplication(
	AphrontRequest $request,
	string $diagramName = null,
	string $diagramPHID = null,
	string $diagramVersion = null,
	string $diagramBase64 = null
	) {
	$applicationUrl = "/" . explode("/", $request->getPath())[1];

	$content = phutil_tag(
	'div',
	array(),
	array(
	phutil_tag(
	'div',
	array(
	'id' => 'mainScreen',
	)),
	phutil_tag('div',
	array(),
	array(
	phutil_tag(
	'img',
	array(
	'class' => 'drawio',
	)),
	)),
	phutil_tag(
	'script',
	array(
	'src' => 'phorge_extension.js',
	'defer' => true
	),
	''
	),
	phutil_tag(
	'script',
	array(
	'src' => $applicationUrl . '/loadJsExtension/'
	. $diagramName
	. '/'
	. $diagramPHID
	. '/'
	. $diagramVersion
	. '/',
	'defer' => true
	),
	''
	),
	phutil_tag(
	'div',
	array(
	'class' => 'crumbs',
	'style' => 'top:48px;'
	. 'margin-left: 4px;'
	. 'position: fixed;'
	. 'font-weight: bold;'
	),
	array(
	phutil_tag(
	'a',
	array(
	'href' => $applicationUrl
	),
	array(
	phutil_tag(
	'span',
	array(
	'class' => 'phui-font-fa fa-sitemap',
	'style' => 'padding-right:5px;'
	))
	)),
	phutil_tag(
	'a',
	array(
	'href' => $applicationUrl
	),
	'Diagram'
	),
	phutil_tag(
	'span',
	array(
	'class' => 'diagramName',
	'style' => 'display:none'
	),
	array(
	phutil_tag(
	'span',
	array(
	'style' => 'margin: 5px;'
	. 'opacity: .5;'
	),
	'>'
	),
	phutil_tag(
	'a',
	array(),
	''
	),
	phutil_tag(
	'span',
	array(
	'class' => 'version',
	'style' => 'margin-left: 8px;'
	. 'color: #999;'),
	''),
	))
	))
	));

	$view = id(new PhabricatorStandardPageView())
	->setRequest($request)
	->setController($this)
	->setDeviceReady(true)
	->setTitle("Diagrams")
	->appendChild($content);

	$response = id(new AphrontWebpageResponse())
	->setContent($view->render());

	return $response;
	}

	/**
	* Shows the internal draw.io application
	*/
	private function showIframe(
	AphrontRequest $request
	) {
	$content = phutil_tag(
	'html',
	array(),
	array(
	phutil_tag(
	'head',
	array(),
	array(
	phutil_tag(
	'title',
	array(),
	'Flowchart Maker & Online Diagram Software'
	),
	phutil_tag(
	'meta',
	array(
	'charset' => 'utf-8'
	)
	),
	phutil_tag(
	'meta',
	array(
	'http-equiv' => 'content-type',
	'content' => 'text/html; charset=utf-8'
	)
	),
	phutil_tag(
	'meta',
	array(
	'name' => 'viewport',
	'content' => 'width=device-width, initial-scale=1.0, '
	. 'maximum-scale=1.0, user-scalable=no'
	)
	),
	phutil_tag(
	'meta',
	array(
	'name' => 'mobile-web-app-capable',
	'content' => 'yes'
	)
	),
	phutil_tag(
	'link',
	array(
	'rel' => 'stylesheet',
	'type' => 'text/css',
	'href' => 'iframe.css'
	)
	),
	phutil_tag(
	'link',
	array(
	'rel' => 'stylesheet',
	'type' => 'text/css',
	'href' => 'iframe-toolbtn.css'
	)
	),
	phutil_tag(
	'link',
	array(
	'rel' => 'stylesheet',
	'type' => 'text/css',
	'href' => 'styles/grapheditor.css'
	)
	),
	phutil_tag(
	'script',
	array(
	'type' => 'text/javascript',
	'src' => 'iframe1.js',
	'defer' => true
	)
	)
	)
	),
	phutil_tag(
	'body',
	array(
	'class' => 'geEditor'
	),
	array(
	phutil_tag(
	'div',
	array(
	'id' => 'geinfo'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'geBlock'
	),
	array(
	phutil_tag(
	'h1',
	array(),
	'Flowchart Maker and Online Diagram Software'
	),
	phutil_tag(
	'p',
	array(),
	'draw.io is free online diagram software. You can use '
	. 'it as a flowchart maker, network diagram software, '
	. 'to create UML online, as an ER diagram tool, to '
	. 'design database schema, to build BPMN online, as a '
	. 'circuit diagram maker, and more. draw.io can import '
	. '.vsdx, Gliffy™ and Lucidchart™ files.'
	),
	phutil_tag(
	'h2',
	array(
	'id' => 'gestatus'
	),
	'Loading...'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'init-spinner'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'content'
	),
	array(
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(0deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -1s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(27deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.923077ss;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(55deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.846154s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(83deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.769231s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(110deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.692308s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(138deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.615385s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(166deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.538462s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(193deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.461538s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(221deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.384615s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(249deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.307692s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(276deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.230769s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(304deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.153846s;'
	)
	)
	),
	phutil_tag(
	'div',
	array(
	'class' => 'spike',
	'style' => 'transform: rotate(332deg)'
	. ' translatex(13px);'
	),
	phutil_tag(
	'div',
	array(
	'class' => 'animator',
	'style' => 'animation-delay: -0.0769231s;'
	)
	)
	)
	)
	)
	)
	)
	- ),
	+ )
	),
	phutil_tag(
	'script',
	array(
	'type' => 'text/javascript',
	'src' => 'iframe2.js',
	'defer' => true
	)
	),
	phutil_tag(
	'script',
	array(
	'type' => 'text/javascript',
	'src' => 'iframe-toolbtn.js',
	'defer' => true
	)
	)
	)
	)
	)
	);

	$response = id(new PlainHtmlWebpageResponse())
	->setFrameable(true)
	->setContent($content);

	return $response;
	}
	}

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