Bug/48678/restore dav error response

apps/dav/composer/composer/autoload_classmap.php

@@ -276,7 +276,7 @@
     'OCA\\DAV\\Events\\SubscriptionUpdatedEvent' => $baseDir . '/../lib/Events/SubscriptionUpdatedEvent.php',
     'OCA\\DAV\\Exception\\ServerMaintenanceMode' => $baseDir . '/../lib/Exception/ServerMaintenanceMode.php',
     'OCA\\DAV\\Exception\\UnsupportedLimitOnInitialSyncException' => $baseDir . '/../lib/Exception/UnsupportedLimitOnInitialSyncException.php',
-    'OCA\\DAV\\Files\\ErrorPagePlugin' => $baseDir . '/../lib/Files/ErrorPagePlugin.php',
+    'OCA\\DAV\\Files\\BrowserErrorPagePlugin' => $baseDir . '/../lib/Files/BrowserErrorPagePlugin.php',
     'OCA\\DAV\\Files\\FileSearchBackend' => $baseDir . '/../lib/Files/FileSearchBackend.php',
     'OCA\\DAV\\Files\\FilesHome' => $baseDir . '/../lib/Files/FilesHome.php',
     'OCA\\DAV\\Files\\LazySearchBackend' => $baseDir . '/../lib/Files/LazySearchBackend.php',

apps/dav/composer/composer/autoload_static.php

@@ -291,7 +291,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Events\\SubscriptionUpdatedEvent' => __DIR__ . '/..' . '/../lib/Events/SubscriptionUpdatedEvent.php',
         'OCA\\DAV\\Exception\\ServerMaintenanceMode' => __DIR__ . '/..' . '/../lib/Exception/ServerMaintenanceMode.php',
         'OCA\\DAV\\Exception\\UnsupportedLimitOnInitialSyncException' => __DIR__ . '/..' . '/../lib/Exception/UnsupportedLimitOnInitialSyncException.php',
-        'OCA\\DAV\\Files\\ErrorPagePlugin' => __DIR__ . '/..' . '/../lib/Files/ErrorPagePlugin.php',
+        'OCA\\DAV\\Files\\BrowserErrorPagePlugin' => __DIR__ . '/..' . '/../lib/Files/BrowserErrorPagePlugin.php',
         'OCA\\DAV\\Files\\FileSearchBackend' => __DIR__ . '/..' . '/../lib/Files/FileSearchBackend.php',
         'OCA\\DAV\\Files\\FilesHome' => __DIR__ . '/..' . '/../lib/Files/FilesHome.php',
         'OCA\\DAV\\Files\\LazySearchBackend' => __DIR__ . '/..' . '/../lib/Files/LazySearchBackend.php',

apps/dav/lib/Connector/Sabre/Server.php

@@ -7,6 +7,9 @@
  */
 namespace OCA\DAV\Connector\Sabre;
 
+use Sabre\DAV\Exception;
+use Sabre\DAV\Version;
+
 /**
  * Class \OCA\DAV\Connector\Sabre\Server
  *
@@ -26,9 +29,11 @@ public function __construct($treeOrNode = null) {
 		$this->enablePropfindDepthInfinity = true;
 	}
 
-	// Copied from 3rdparty/sabre/dav/lib/DAV/Server.php
-	// Should be them exact same without the exception output.
-	public function start(): void {
+	/**
+	 *
+	 * @return void
+	 */
+	public function start() {
 		try {
 			// If nginx (pre-1.2) is used as a proxy server, and SabreDAV as an
 			// origin, we must make sure we send back HTTP/1.0 if this was
@@ -42,10 +47,74 @@ public function start(): void {
 			$this->httpRequest->setBaseUrl($this->getBaseUri());
 			$this->invokeMethod($this->httpRequest, $this->httpResponse);
 		} catch (\Throwable $e) {
+			if ($e instanceof \TypeError) {
+				/*
+				 * The TypeError includes the file path where the error occurred,
+				 * potentially revealing the installation directory.
+				 *
+				 * By re-throwing the exception, we ensure that the
+				 * default exception handler processes it.
+				 */
+				throw $e;
+			}
+
 			try {
 				$this->emit('exception', [$e]);
 			} catch (\Exception $ignore) {
 			}
+
+			$DOM = new \DOMDocument('1.0', 'utf-8');
+			$DOM->formatOutput = true;
+
+			$error = $DOM->createElementNS('DAV:', 'd:error');
+			$error->setAttribute('xmlns:s', self::NS_SABREDAV);
+			$DOM->appendChild($error);
+
+			$h = function ($v) {
+				return htmlspecialchars((string)$v, ENT_NOQUOTES, 'UTF-8');
+			};
+
+			if (self::$exposeVersion) {
+				$error->appendChild($DOM->createElement('s:sabredav-version', $h(Version::VERSION)));
+			}
+
+			$error->appendChild($DOM->createElement('s:exception', $h(get_class($e))));
+			$error->appendChild($DOM->createElement('s:message', $h($e->getMessage())));
+			if ($this->debugExceptions) {
+				$error->appendChild($DOM->createElement('s:file', $h($e->getFile())));
+				$error->appendChild($DOM->createElement('s:line', $h($e->getLine())));
+				$error->appendChild($DOM->createElement('s:code', $h($e->getCode())));
+				$error->appendChild($DOM->createElement('s:stacktrace', $h($e->getTraceAsString())));
+			}
+
+			if ($this->debugExceptions) {
+				$previous = $e;
+				while ($previous = $previous->getPrevious()) {
+					$xPrevious = $DOM->createElement('s:previous-exception');
+					$xPrevious->appendChild($DOM->createElement('s:exception', $h(get_class($previous))));
+					$xPrevious->appendChild($DOM->createElement('s:message', $h($previous->getMessage())));
+					$xPrevious->appendChild($DOM->createElement('s:file', $h($previous->getFile())));
+					$xPrevious->appendChild($DOM->createElement('s:line', $h($previous->getLine())));
+					$xPrevious->appendChild($DOM->createElement('s:code', $h($previous->getCode())));
+					$xPrevious->appendChild($DOM->createElement('s:stacktrace', $h($previous->getTraceAsString())));
+					$error->appendChild($xPrevious);
+				}
+			}
+
+			if ($e instanceof Exception) {
+				$httpCode = $e->getHTTPCode();
+				$e->serialize($this, $error);
+				$headers = $e->getHTTPHeaders($this);
+			} else {
+				$httpCode = 500;
+				$headers = [];
+			}
+			$headers['Content-Type'] = 'application/xml; charset=utf-8';
+
+			$this->httpResponse->setStatus($httpCode);
+			$this->httpResponse->setHeaders($headers);
+			$this->httpResponse->setBody($DOM->saveXML());
+			$this->sapi->sendResponse($this->httpResponse);
 		}
 	}
 }

apps/dav/lib/Connector/Sabre/ServerFactory.php

@@ -12,7 +12,7 @@
 use OCA\DAV\CalDAV\DefaultCalendarValidator;
 use OCA\DAV\DAV\CustomPropertiesBackend;
 use OCA\DAV\DAV\ViewOnlyPlugin;
-use OCA\DAV\Files\ErrorPagePlugin;
+use OCA\DAV\Files\BrowserErrorPagePlugin;
 use OCA\Theming\ThemingDefaults;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Folder;
@@ -90,7 +90,9 @@ public function createServer(string $baseUri,
 			$server->addPlugin(new FakeLockerPlugin());
 		}
 
-		$server->addPlugin(new ErrorPagePlugin($this->request, $this->config));
+		if (BrowserErrorPagePlugin::isBrowserRequest($this->request)) {
+			$server->addPlugin(new BrowserErrorPagePlugin());
+		}
 
 		// wait with registering these until auth is handled and the filesystem is setup
 		$server->on('beforeMethod:*', function () use ($server, $objectTree, $viewCallBack): void {

apps/dav/lib/Files/ErrorPagePlugin.php → apps/dav/lib/Files/BrowserErrorPagePlugin.php

@@ -7,22 +7,17 @@
  */
 namespace OCA\DAV\Files;
 
+use OC\AppFramework\Http\Request;
 use OC_Template;
 use OCP\AppFramework\Http\ContentSecurityPolicy;
-use OCP\IConfig;
 use OCP\IRequest;
 use Sabre\DAV\Exception;
 use Sabre\DAV\Server;
 use Sabre\DAV\ServerPlugin;
 
-class ErrorPagePlugin extends ServerPlugin {
-	private ?Server $server = null;
-
-	public function __construct(
-		private IRequest $request,
-		private IConfig $config,
-	) {
-	}
+class BrowserErrorPagePlugin extends ServerPlugin {
+	/** @var Server */
+	private $server;
 
 	/**
 	 * This initializes the plugin.
@@ -31,12 +26,35 @@ public function __construct(
 	 * addPlugin is called.
 	 *
 	 * This method should set up the required event subscriptions.
+	 *
+	 * @param Server $server
+	 * @return void
 	 */
-	public function initialize(Server $server): void {
+	public function initialize(Server $server) {
 		$this->server = $server;
 		$server->on('exception', [$this, 'logException'], 1000);
 	}
 
+	/**
+	 * @param IRequest $request
+	 * @return bool
+	 */
+	public static function isBrowserRequest(IRequest $request) {
+		if ($request->getMethod() !== 'GET') {
+			return false;
+		}
+		return $request->isUserAgent([
+			Request::USER_AGENT_IE,
+			Request::USER_AGENT_MS_EDGE,
+			Request::USER_AGENT_CHROME,
+			Request::USER_AGENT_FIREFOX,
+			Request::USER_AGENT_SAFARI,
+		]);
+	}
+
+	/**
+	 * @param \Throwable $ex
+	 */
 	public function logException(\Throwable $ex): void {
 		if ($ex instanceof Exception) {
 			$httpCode = $ex->getHTTPCode();
@@ -47,7 +65,7 @@ public function logException(\Throwable $ex): void {
 		}
 		$this->server->httpResponse->addHeaders($headers);
 		$this->server->httpResponse->setStatus($httpCode);
-		$body = $this->generateBody($ex, $httpCode);
+		$body = $this->generateBody($httpCode);
 		$this->server->httpResponse->setBody($body);
 		$csp = new ContentSecurityPolicy();
 		$this->server->httpResponse->addHeader('Content-Security-Policy', $csp->buildPolicy());
@@ -58,32 +76,18 @@ public function logException(\Throwable $ex): void {
 	 * @codeCoverageIgnore
 	 * @return bool|string
 	 */
-	public function generateBody(\Throwable $ex, int $httpCode): mixed {
-		if ($this->acceptHtml()) {
-			$templateName = 'exception';
-			$renderAs = 'guest';
-			if ($httpCode === 403 || $httpCode === 404) {
-				$templateName = (string)$httpCode;
-			}
-		} else {
-			$templateName = 'xml_exception';
-			$renderAs = null;
-			$this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
-		}
+	public function generateBody(int $httpCode) {
+		$request = \OC::$server->getRequest();
 
-		$debug = $this->config->getSystemValueBool('debug', false);
+		$templateName = 'exception';
+		if ($httpCode === 403 || $httpCode === 404) {
+			$templateName = (string)$httpCode;
+		}
 
-		$content = new OC_Template('core', $templateName, $renderAs);
+		$content = new OC_Template('core', $templateName, 'guest');
 		$content->assign('title', $this->server->httpResponse->getStatusText());
-		$content->assign('remoteAddr', $this->request->getRemoteAddress());
-		$content->assign('requestID', $this->request->getId());
-		$content->assign('debugMode', $debug);
-		$content->assign('errorClass', get_class($ex));
-		$content->assign('errorMsg', $ex->getMessage());
-		$content->assign('errorCode', $ex->getCode());
-		$content->assign('file', $ex->getFile());
-		$content->assign('line', $ex->getLine());
-		$content->assign('exception', $ex);
+		$content->assign('remoteAddr', $request->getRemoteAddress());
+		$content->assign('requestID', $request->getId());
 		return $content->fetchPage();
 	}
 
@@ -92,15 +96,6 @@ public function generateBody(\Throwable $ex, int $httpCode): mixed {
 	 */
 	public function sendResponse() {
 		$this->server->sapi->sendResponse($this->server->httpResponse);
-	}
-
-	private function acceptHtml(): bool {
-		foreach (explode(',', $this->request->getHeader('Accept')) as $part) {
-			$subparts = explode(';', $part);
-			if (str_ends_with($subparts[0], '/html')) {
-				return true;
-			}
-		}
-		return false;
+		exit();
 	}
 }

apps/dav/lib/Server.php

@@ -54,7 +54,7 @@
 use OCA\DAV\DAV\ViewOnlyPlugin;
 use OCA\DAV\Events\SabrePluginAddEvent;
 use OCA\DAV\Events\SabrePluginAuthInitEvent;
-use OCA\DAV\Files\ErrorPagePlugin;
+use OCA\DAV\Files\BrowserErrorPagePlugin;
 use OCA\DAV\Files\FileSearchBackend;
 use OCA\DAV\Files\LazySearchBackend;
 use OCA\DAV\Profiler\ProfilerPlugin;
@@ -244,7 +244,9 @@ public function __construct(
 			$this->server->addPlugin(new FakeLockerPlugin());
 		}
 
-		$this->server->addPlugin(new ErrorPagePlugin($this->request, \OC::$server->getConfig()));
+		if (BrowserErrorPagePlugin::isBrowserRequest($request)) {
+			$this->server->addPlugin(new BrowserErrorPagePlugin());
+		}
 
 		$lazySearchBackend = new LazySearchBackend();
 		$this->server->addPlugin(new SearchPlugin($lazySearchBackend));

apps/dav/tests/testsuits/caldavtest/tests/CalDAV/sync-report.xml

@@ -2701,7 +2701,7 @@
 					<callback>prepostcondition</callback>
 					<arg>
 						<name>error</name>
-						<value>{http://sabredav.org/ns}exception</value>
+						<value>{DAV:}valid-sync-token</value>
 					</arg>
 					<arg>
 						<name>ignoreextras</name>

apps/dav/tests/unit/DAV/ErrorPagePluginTest.php → apps/dav/tests/unit/DAV/BrowserErrorPagePluginTest.php

@@ -7,20 +7,20 @@
  */
 namespace OCA\DAV\Tests\unit\DAV;
 
-use OCA\DAV\Files\ErrorPagePlugin;
+use OCA\DAV\Files\BrowserErrorPagePlugin;
 use Sabre\DAV\Exception\NotFound;
 use Sabre\HTTP\Response;
 
-class ErrorPagePluginTest extends \Test\TestCase {
+class BrowserErrorPagePluginTest extends \Test\TestCase {
 
 	/**
 	 * @dataProvider providesExceptions
 	 * @param $expectedCode
 	 * @param $exception
 	 */
 	public function test($expectedCode, $exception): void {
-		/** @var ErrorPagePlugin | \PHPUnit\Framework\MockObject\MockObject $plugin */
-		$plugin = $this->getMockBuilder(ErrorPagePlugin::class)->disableOriginalConstructor()->setMethods(['sendResponse', 'generateBody'])->getMock();
+		/** @var BrowserErrorPagePlugin | \PHPUnit\Framework\MockObject\MockObject $plugin */
+		$plugin = $this->getMockBuilder(BrowserErrorPagePlugin::class)->setMethods(['sendResponse', 'generateBody'])->getMock();
 		$plugin->expects($this->once())->method('generateBody')->willReturn(':boom:');
 		$plugin->expects($this->once())->method('sendResponse');
 		/** @var \Sabre\DAV\Server | \PHPUnit\Framework\MockObject\MockObject $server */

build/integration/dav_features/caldav.feature

@@ -5,15 +5,17 @@ Feature: caldav
     Given user "user0" exists
     When "admin" requests calendar "user0/MyCalendar" on the endpoint "/remote.php/dav/calendars/"
     Then The CalDAV HTTP status code should be "404"
-    And The exception is "Internal Server Error"
+    And The exception is "Sabre\DAV\Exception\NotFound"
+    And The error message is "Node with name 'MyCalendar' could not be found"
 
   Scenario: Accessing a not shared calendar of another user
     Given user "user0" exists
     Given "admin" creates a calendar named "MyCalendar"
     Given The CalDAV HTTP status code should be "201"
     When "user0" requests calendar "admin/MyCalendar" on the endpoint "/remote.php/dav/calendars/"
     Then The CalDAV HTTP status code should be "404"
-    And The exception is "Internal Server Error"
+    And The exception is "Sabre\DAV\Exception\NotFound"
+    And The error message is "Calendar with name 'MyCalendar' could not be found"
 
   Scenario: Accessing a not shared calendar of another user via the legacy endpoint
     Given user "user0" exists
@@ -28,7 +30,8 @@ Feature: caldav
     Given user "user0" exists
     When "user0" requests calendar "admin/MyCalendar" on the endpoint "/remote.php/dav/calendars/"
     Then The CalDAV HTTP status code should be "404"
-    And The exception is "Internal Server Error"
+    And The exception is "Sabre\DAV\Exception\NotFound"
+    And The error message is "Node with name 'MyCalendar' could not be found"
 
   Scenario: Accessing a not existing calendar of another user via the legacy endpoint
     Given user "user0" exists
@@ -41,7 +44,8 @@ Feature: caldav
     Given user "user0" exists
     When "user0" requests calendar "admin/MyCalendar" on the endpoint "/remote.php/dav/calendars/"
     Then The CalDAV HTTP status code should be "404"
-    And The exception is "Internal Server Error"
+    And The exception is "Sabre\DAV\Exception\NotFound"
+    And The error message is "Node with name 'MyCalendar' could not be found"
 
   Scenario: Creating a new calendar
     When "admin" creates a calendar named "MyCalendar"
@@ -62,15 +66,17 @@ Feature: caldav
     Given user "user0" exists
     When "user0" sends a create calendar request to "admin/MyCalendar2" on the endpoint "/remote.php/dav/calendars/"
     Then The CalDAV HTTP status code should be "404"
-    And The exception is "Internal Server Error"
+    And The exception is "Sabre\DAV\Exception\NotFound"
+    And The error message is "Node with name 'admin' could not be found"
 
   Scenario: Create calendar request for existing calendar of another user
     Given user "user0" exists
     When "admin" creates a calendar named "MyCalendar2"
     Then The CalDAV HTTP status code should be "201"
     When "user0" sends a create calendar request to "admin/MyCalendar2" on the endpoint "/remote.php/dav/calendars/"
     Then The CalDAV HTTP status code should be "404"
-    And The exception is "Internal Server Error"
+    And The exception is "Sabre\DAV\Exception\NotFound"
+    And The error message is "Node with name 'admin' could not be found"
 
   Scenario: Update a principal's schedule-default-calendar-URL
     Given user "user0" exists