Merge branch 'main' into issue-3911issue-3911

1 files changed, 254 insertions, 0 deletions

diff --git a/lib/elearning/ObjectConnections.php b/lib/elearning/ObjectConnections.php
new file mode 100644
index 0000000..e360f71
--- /dev/null
+++ b/lib/elearning/ObjectConnections.php
@@ -0,0 +1,254 @@
+<?php
+# Lifter002: DONE
+# Lifter003: TEST
+# Lifter007: TODO
+# Lifter010: TODO
+/**
+* class to handle object connections
+*
+* This class contains methods to handle connections between stud.ip-objects and external content.
+*
+* @author   Arne Schröder <schroeder@data-quest.de>
+* @access   public
+* @modulegroup  elearning_interface_modules
+* @module       ObjectConnections
+* @package  ELearning-Interface
+*/
+class ObjectConnections
+{
+    var $id;
+    var $object_connections;
+    /**
+    * constructor
+    *
+    * init class.
+    * @access public
+    * @param string $object_id object-id
+    */
+    function __construct($object_id = "")
+    {
+        $this->id = $object_id;
+        if ($object_id != "")
+            $this->readData();
+    }
+
+    /**
+    * read object connections
+    *
+    * gets object connections from database
+    * @access public
+    */
+    function readData()
+    {
+        global $ELEARNING_INTERFACE_MODULES;
+
+        $this->object_connections = [];
+
+        $query = "SELECT system_type, module_type, module_id, chdate
+                  FROM object_contentmodules
+                  WHERE object_id = ?
+                  ORDER BY chdate DESC";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([$this->id]);
+
+        $module_count = 0;
+        while ($row = $statement->fetch(PDO::FETCH_ASSOC)) {
+            // show only connected modules with valid module-type
+            if ($ELEARNING_INTERFACE_MODULES[$row['system_type']]['types'][$row['module_type']] == '') {
+                continue;
+            }
+            $module_count += 1;
+            $d_system_type = $row['system_type'];
+            $d_module_type = $row['module_type'];
+            $d_module_id   = $row['module_id'];
+
+            $reference = $d_system_type . '_' . $d_module_type . '_' . $d_module_id;
+            $this->object_connections[$reference]['cms']    = $d_system_type;
+            $this->object_connections[$reference]['type']   = $d_module_type;
+            $this->object_connections[$reference]['id']     = $d_module_id;
+            $this->object_connections[$reference]['chdate'] = $row['chdate'];
+        }
+
+        if ($module_count == 0) {
+            $this->object_connections = false;
+        }
+    }
+
+    /**
+    * get object connections
+    *
+    * returns object connections
+    * @access public
+    * @return array object connections
+    */
+    function getConnections()
+    {
+        return $this->object_connections;
+    }
+
+    /**
+    * get connection-status
+    *
+    * returns true, if object has connections
+    * @access public
+    * @return boolean connection-status
+    */
+    function isConnected()
+    {
+        return (boolean) $this->object_connections;
+    }
+
+    /**
+     * get connection-status
+     *
+     * returns true, if object has connections
+     * @access public
+     * @param string $object_id object-id (optional)
+     * @return boolean connection-status
+     */
+    public static function isObjectConnected($object_id)
+    {
+        $query = "SELECT 1 FROM object_contentmodules WHERE object_id = ?";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([$object_id]);
+        return (bool)$statement->fetchColumn();
+    }
+
+    /**
+    * get module-id
+    *
+    * returns module-id of given connection
+    * @access public
+    * @param string $connection_object_id object-id
+    * @param string $connection_module_type module-type
+    * @param string $connection_cms system-type
+    * @return string module-id
+    */
+    public static function getConnectionModuleId($connection_object_id, $connection_module_type, $connection_cms)
+    {
+        $query = "SELECT module_id
+                  FROM object_contentmodules
+                  WHERE object_id = ? AND system_type = ? AND module_type = ?";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([
+            $connection_object_id,
+            $connection_cms,
+            $connection_module_type
+        ]);
+        return $statement->fetchColumn() ?: false;
+    }
+
+    /**
+    * set connection
+    *
+    * sets connection with object
+    * @access public
+    * @param string $connection_object_id object-id
+    * @param string $connection_module_id module-id
+    * @param string $connection_module_type module-type
+    * @param string $connection_cms system-type
+    * @return boolean successful
+    */
+    public static function setConnection($connection_object_id, $connection_module_id, $connection_module_type, $connection_cms)
+    {
+        $query = "SELECT 1
+                  FROM object_contentmodules
+                  WHERE object_id = ? AND module_id = ? AND system_type = ?
+                    AND module_type = ?";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([
+            $connection_object_id,
+            $connection_module_id,
+            $connection_cms,
+            $connection_module_type
+        ]);
+        $check = $statement->fetchColumn();
+
+        if ($check) {
+            $query = "UPDATE object_contentmodules
+                      SET module_type = ?, chdate = UNIX_TIMESTAMP()
+                      WHERE object_id = ? AND module_id = ? AND system_type = ?";
+            $statement = DBManager::get()->prepare($query);
+            $statement->execute([
+                $connection_module_type,
+                $connection_object_id,
+                $connection_module_id,
+                $connection_cms
+            ]);
+        } else {
+            $query = "INSERT INTO object_contentmodules
+                        (object_id, module_id, system_type, module_type, mkdate, chdate)
+                      VALUES (?, ?, ?, ?, UNIX_TIMESTAMP(), UNIX_TIMESTAMP())";
+            $statement = DBManager::get()->prepare($query);
+            $statement->execute([
+                $connection_object_id,
+                $connection_module_id,
+                $connection_cms,
+                $connection_module_type
+            ]);
+        }
+        return true;
+    }
+
+    /**
+    * unset connection
+    *
+    * deletes connection with object
+    * @access public
+    * @param string $connection_object_id object-id
+    * @param string $connection_module_id module-id
+    * @param string $connection_module_type module-type
+    * @param string $connection_cms system-type
+    * @return boolean successful
+    */
+    public static function unsetConnection($connection_object_id, $connection_module_id, $connection_module_type, $connection_cms)
+    {
+        $query = "SELECT 1
+                  FROM object_contentmodules
+                  WHERE object_id = ? AND module_id = ? AND system_type = ?
+                    AND module_type = ?";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([
+            $connection_object_id,
+            $connection_module_id,
+            $connection_cms,
+            $connection_module_type
+        ]);
+        $check = $statement->fetchColumn();
+
+
+        if ($check) {
+            $query = "DELETE FROM object_contentmodules
+                      WHERE object_id = ? AND module_id = ? AND system_type = ?
+                        AND module_type = ?";
+            $statement = DBManager::get()->prepare($query);
+            $statement->execute([
+                $connection_object_id,
+                $connection_module_id,
+                $connection_cms,
+                $connection_module_type
+            ]);
+            return true;
+        }
+        return false;
+    }
+
+    public static function GetConnectedSystems($object_id)
+    {
+        $query = "SELECT DISTINCT system_type
+                  FROM object_contentmodules
+                  WHERE object_id = ?";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([$object_id]);
+        return $statement->fetchAll(PDO::FETCH_COLUMN);
+    }
+
+    public static function DeleteAllConnections($object_id, $cms_type)
+    {
+        $query = "DELETE FROM object_contentmodules
+                  WHERE object_id = ? AND system_type = ?";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([$object_id, $cms_type]);
+        return $statement->rowCount();
+    }
+}