ILIAS-eLearning · sKarki999 · Mar 5, 2026 · Feb 9, 2026 · Feb 11, 2026 · Mar 4, 2026
diff --git a/components/ILIAS/Mail/classes/class.ilMailLuceneSearcher.php b/components/ILIAS/Mail/classes/class.ilMailLuceneSearcher.php
@@ -35,7 +35,12 @@ public function search(int $user_id, int $mail_folder_id): void
         }
 
         try {
-            $xml = ilRpcClientFactory::factory('RPCSearchHandler')->searchMail();
+            $xml = ilRpcClientFactory::factory('RPCSearchHandler')->searchMail(
+                CLIENT_ID . '_' . $this->settings->get('inst_id', '0'),
+                $user_id,
+                $this->query_parser->getQuery(),
+                $mail_folder_id
+            );
         } catch (Exception $e) {
             ilLoggerFactory::getLogger('mail')->critical($e->getMessage());
             throw $e;

diff --git a/components/ILIAS/WebServices/RPC/classes/class.ilRpcClient.php b/components/ILIAS/WebServices/RPC/classes/class.ilRpcClient.php
@@ -19,15 +19,12 @@
 declare(strict_types=1);
 
 /**
- * Class ilRpcClient
- *
  * @author Fabian Wolf <wolf@leifos.com>
- * @ingroup ServicesWebServicesRPC
  *
  * List of all known RPC methods...
  *
  * RPCIndexHandler:
- * @method void index() index(string $client, bool $bool) Prefix/Package: RPCIndexHandler
+ * @method bool index() index(string $client, bool $bool) Prefix/Package: RPCIndexHandler
  * @method void indexObjects() indexObjects(string $client, array $object_ids) Prefix/Package: RPCIndexHandler
  *
  * RPCTransformationHandler:
@@ -48,56 +45,38 @@ class ilRpcClient
     protected string $url;
     protected string $prefix = '';
     protected int $timeout = 0;
-    protected string $encoding = '';
 
     protected ilLogger $logger;
 
     /**
-     * ilRpcClient constructor.
-     * @param string $a_url URL to connect to
-     * @param string $a_prefix Optional prefix for method names
-     * @param int $a_timeout The maximum number of seconds to allow ilRpcClient to connect.
-     * @param string $a_encoding Character encoding
+     * @param string $url     URL to connect to
+     * @param string $prefix  Optional prefix for method names
+     * @param int    $timeout The maximum number of seconds to allow ilRpcClient to connect.
      * @throws ilRpcClientException
      */
-    public function __construct(string $a_url, string $a_prefix = '', int $a_timeout = 0, string $a_encoding = 'utf-8')
+    public function __construct(string $url, string $prefix = '', int $timeout = 0)
     {
         global $DIC;
 
         $this->logger = $DIC->logger()->wsrv();
-
-        if (!extension_loaded('xmlrpc')) {
-            ilLoggerFactory::getLogger('wsrv')->error('RpcClient Xmlrpc extension not enabled');
-            throw new ilRpcClientException('Xmlrpc extension not enabled.', 50);
-        }
-
-        $this->url = $a_url;
-        $this->prefix = $a_prefix;
-        $this->timeout = $a_timeout;
-        $this->encoding = $a_encoding;
+        $this->url = $url;
+        $this->prefix = $prefix;
+        $this->timeout = $timeout;
     }
 
     /**
-     * Magic caller to all RPC functions
-     *
-     * @param string $a_method Method name
-     * @param array $a_params Argument array
-     * @return mixed Returns either an array, or an integer, or a string, or a boolean according to the response returned by the XMLRPC method.
+     * @param string $method Method name
+     * @param (string|int|bool|int[])[] $parameters Argument array
+     * @return string|stdClass Depends on the response returned by the XMLRPC method.
      * @throws ilRpcClientException
      */
-    public function __call(string $a_method, array $a_params)
+    public function __call(string $method, array $parameters): string|bool|stdClass
     {
         //prepare xml post data
-        $method_name = str_replace('_', '.', $this->prefix . $a_method);
-        $rpc_options = array(
-            'verbosity' => 'newlines_only',
-            'escaping' => 'markup'
-        );
+        $method_name = str_replace('_', '.', $this->prefix . $method);
+
+        $post_data = $this->encodeRequest($method_name, $parameters);
 
-        if ($this->encoding) {
-            $rpc_options['encoding'] = $this->encoding;
-        }
-        $post_data = xmlrpc_encode_request($method_name, $a_params, $rpc_options);
         //try to connect to the given url
         try {
             $curl = new ilCurlConnection($this->url);
@@ -111,7 +90,7 @@ public function __call(string $a_method, array $a_params)
                 $curl->setOpt(CURLOPT_TIMEOUT, $this->timeout);
             }
             $this->logger->debug('RpcClient request to ' . $this->url . ' / ' . $method_name);
-            $xml_resp = $curl->exec();
+            $xml_response = $curl->exec();
         } catch (ilCurlConnectionException $e) {
             $this->logger->error(
                 'RpcClient could not connect to ' . $this->url . ' ' .
@@ -120,18 +99,200 @@ public function __call(string $a_method, array $a_params)
             throw new ilRpcClientException($e->getMessage(), $e->getCode());
         }
 
-        //prepare output, throw exception if rpc fault is detected
-        $resp = xmlrpc_decode($xml_resp, $this->encoding);
+        //return output, throw exception if rpc fault is detected
+        return $this->handleResponse($xml_response);
+    }
 
-        //xmlrpc_is_fault can just handle arrays as response
-        if (is_array($resp) && xmlrpc_is_fault($resp)) {
-            $this->logger->error('RpcClient recieved error ' . $resp['faultCode'] . ': ' . $resp['faultString']);
-            throw new ilRpcClientException(
-                'RPC-Server returned fault message: ' .
-                $resp['faultString'],
-                $resp['faultCode']
-            );
+    /**
+     * @param (string|int|bool|int[])[] $parameters
+     * @throws ilRpcClientException
+     */
+    protected function encodeRequest(string $method, array $parameters): string
+    {
+        $xml = new DOMDocument('1.0', 'UTF-8');
+        $method_call = $xml->createElement('methodCall');
+        $method_name = $xml->createElement('methodName', $method);
+        $params = $xml->createElement('params');
+
+        foreach ($parameters as $parameter) {
+            match (true) {
+                is_string($parameter) => $encoded_parameter = $this->encodeString($parameter),
+                is_int($parameter) => $encoded_parameter = $this->encodeInteger($parameter),
+                is_bool($parameter) => $encoded_parameter = $this->encodeBoolean($parameter),
+                $this->isListOfIntegers($parameter) => $encoded_parameter = $this->encodeListOfIntegers(...$parameter),
+                default => throw new ilRpcClientException(
+                    'Invalid parameter type, only string, int, bool, and int[] are supported.'
+                )
+            };
+            $params->appendChild($xml->importNode($this->wrapParameter($encoded_parameter)->documentElement, true));
+        }
+
+        $method_call->appendChild($method_name);
+        $method_call->appendChild($params);
+
+        $xml->appendChild($method_call);
+        return $xml->saveXML();
+    }
+
+    protected function isListOfIntegers(mixed $parameter): bool
+    {
+        if (!is_array($parameter)) {
+            return false;
+        }
+        foreach ($parameter as $entries) {
+            if (!is_int($entries)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    protected function wrapParameter(DOMDocument $encoded_parameter): DOMDocument
+    {
+        $xml = new DOMDocument('1.0', 'UTF-8');
+        $param = $xml->createElement('param');
+        $value = $xml->createElement('value');
+
+        $value->appendChild($xml->importNode($encoded_parameter->documentElement, true));
+        $param->appendChild($value);
+
+        $xml->appendChild($param);
+        return $xml;
+    }
+
+    protected function encodeString(string $parameter): DOMDocument
+    {
+        $xml = new DOMDocument('1.0', 'UTF-8');
+        $xml->appendChild($xml->createElement('string', $parameter));
+        return $xml;
+    }
+
+    protected function encodeInteger(int $parameter): DOMDocument
+    {
+        $xml = new DOMDocument('1.0', 'UTF-8');
+        $xml->appendChild($xml->createElement('int', (string) $parameter));
+        return $xml;
+    }
+
+    protected function encodeBoolean(bool $parameter): DOMDocument
+    {
+        $xml = new DOMDocument('1.0', 'UTF-8');
+        $xml->appendChild($xml->createElement('boolean', $parameter ? '1' : '0'));
+        return $xml;
+    }
+
+    protected function encodeListOfIntegers(int ...$parameters): DOMDocument
+    {
+        $xml = new DOMDocument('1.0', 'UTF-8');
+        $array = $xml->createElement('array');
+        $data = $xml->createElement('data');
+
+        foreach ($parameters as $parameter) {
+            $value = $xml->createElement('value');
+            $value->appendChild($xml->importNode($this->encodeInteger($parameter)->documentElement, true));
+            $data->appendChild($value);
+        }
+        $array->appendChild($data);
+
+        $xml->appendChild($array);
+        return $xml;
+    }
+
+    /**
+     * Returns decoded response if not faulty, otherwise throws exception.
+     * @throws ilRpcClientException
+     */
+    public function handleResponse(string $xml): string|bool|stdClass
+    {
+        $response = new DOMDocument('1.0', 'UTF-8');
+        $response->preserveWhiteSpace = false;
+        $response->loadXML($xml);
+
+        if (!$response) {
+            throw new ilRpcClientException('Invalid XML response');
+        }
+
+        $response_body = $response->documentElement->childNodes->item(0);
+
+        if ($response_body === null) {
+            throw new ilRpcClientException('Empty response');
+        }
+
+        $this->logger->dump($response_body);
+
+        return match ($response_body->nodeName) {
+            'params' => $this->decodeOKResponse($response_body),
+            'fault' => $this->handleFaultResponse($response_body),
+            default => throw new ilRpcClientException('Unexpected element in response: ' . get_class($response_body)),
+        };
+    }
+
+    protected function decodeOKResponse(DOMElement $response_body): string|bool|stdClass
+    {
+        $param_child = $response_body->getElementsByTagName('value')->item(0)?->childNodes?->item(0);
+
+        if ($param_child === null) {
+            throw new ilRpcClientException('No value in response');
+        }
+
+        return match ($param_child->nodeName) {
+            'string' => $this->decodeString($param_child),
+            '#text' => $this->decodeString($param_child), // org.apache.xmlrpc returns java strings as unwrapped text node
+            'base64' => $this->decodeBase64($param_child),
+            'boolean' => $this->decodeBoolean($param_child),
+            default => throw new ilRpcClientException('Unexpected element in response value: ' . $param_child->nodeName),
+        };
+    }
+
+    protected function decodeString(DOMNode $string): string
+    {
+        return (string) $string->nodeValue;
+    }
+
+    protected function decodeBase64(DOMNode $base64): stdClass
+    {
+        return (object) base64_decode((string) $base64->nodeValue);
+    }
+
+    protected function decodeBoolean(DOMNode $boolean): bool
+    {
+        return (bool) $boolean->nodeValue;
+    }
+
+    /**
+     * @throws ilRpcClientException
+     */
+    protected function handleFaultResponse(DOMElement $response_body): string
+    {
+        $fault_code = null;
+        $fault_string = null;
+
+        $members = $response_body->getElementsByTagName('member');
+        foreach ($members as $member) {
+            $name = $member->getElementsByTagName('name')->item(0)?->nodeValue;
+            if ($name === 'faultCode') {
+                if ($fault_code !== null) {
+                    throw new ilRpcClientException('Multiple codes in fault response.');
+                }
+                $fault_code = (int) $member->getElementsByTagName('int')->item(0)?->nodeValue;
+            }
+            if ($name === 'faultString') {
+                if ($fault_string !== null) {
+                    throw new ilRpcClientException('Multiple strings in fault response.');
+                }
+                $fault_string = $member->getElementsByTagName('string')->item(0)?->nodeValue;
+            }
+        }
+
+        if ($fault_code === null || $fault_string === null) {
+            throw new ilRpcClientException('No code or no string in fault respsonse');
         }
-        return $resp;
+
+        $this->logger->error('RpcClient recieved error ' . $fault_code . ': ' . $fault_string);
+        throw new ilRpcClientException(
+            'RPC-Server returned fault message: ' .
+            $fault_string,
+            $fault_code
+        );
     }
 }
diff --git a/components/ILIAS/WebServices/RPC/classes/class.ilRpcClientFactory.php b/components/ILIAS/WebServices/RPC/classes/class.ilRpcClientFactory.php
@@ -17,26 +17,22 @@
  *********************************************************************/
 
 declare(strict_types=1);
+
 /**
- * @classDescription Factory for ILIAS rpc client
  * @author Stefan Meyer <meyer@leifos.com>
  */
 class ilRpcClientFactory
 {
     /**
-     * Creates an ilRpcClient instance to our ilServer
-     *
-     * @param string $a_package Package name
-     * @param int $a_timeout The maximum number of seconds to allow ilRpcClient to connect.
-     * @return ilRpcClient
+     * @param string $package Package name
+     * @param int    $timeout The maximum number of seconds to allow ilRpcClient to connect.
      */
-    public static function factory(string $a_package, int $a_timeout = 0): ilRpcClient
+    public static function factory(string $package, int $timeout = 0): ilRpcClient
     {
         return new ilRpcClient(
             ilRPCServerSettings::getInstance()->getServerUrl(),
-            $a_package . '.',
-            $a_timeout,
-            'UTF-8'
+            $package . '.',
+            $timeout
         );
     }
 }
diff --git a/components/ILIAS/WebServices/RPC/lib/README.md b/components/ILIAS/WebServices/RPC/lib/README.md
@@ -27,12 +27,12 @@ This Java server has been tested with Open JDK Java Runtime 17.
 To be able to index and search for non-ASCII characters your system should
 support UTF-8 encodings.
 
-PHP curl and xmlrpc are required for using the Java server features.
+PHP curl is required for using the Java server features.
 
 On Debian-based systems try:
 
 ````shell
-> apt-get install php-curl php-xmlrpc openjdk-17-jdk-headless
+> apt-get install php-curl openjdk-17-jdk-headless
 ````
 Dependencies and the build process is managed via maven
 ```shell
@@ -180,4 +180,4 @@ if no installation id is given.
 
 ```shell
 > java -jar /foo/bar/target/ilServer.jar /foo/bar/ilServer.ini search <CLIENT_INFO> "ilias"
-```
+```
diff --git a/docs/configuration/install.md b/docs/configuration/install.md
@@ -118,7 +118,6 @@ gd, dom, xsl, pdo, pdo_mysql, curl, json, simplexml, libxml, xml, zip, imagick,
 
 **Optional PHP Extensions:**
 
-* `xmlrpc` for the ILIAS RPC server
 * `soap` for SOAP user administration 
 * `ldap` for LDAP user authentication
 
@@ -128,7 +127,7 @@ Alternatively, it can be obtained directly from [getcomposer.org](https://getcom
 Composer may be optional when using the prepacked ILIAS from [Download & Releases](https://docu.ilias.de/go/pg/197851_35), but it is necessary when using plugins to rebuild the PHP autoload classmap.
 
 ```shell
-apt install apache2 libapache2-mod-php php php-gd php-xsl php-imagick php-curl php-mysql php-xmlrpc php-soap php-ldap composer
+apt install apache2 libapache2-mod-php php php-gd php-xsl php-imagick php-curl php-mysql php-soap php-ldap composer
 ```
 
 Create a directory for the html sources (e.g. `/var/www/ilias`) which is referenced in the apache2 vhost and also a directory outside the web servers docroot (e.g. `/var/www/files`) for files stored by ILIAS.