From 47cbb529f5723b246125ae083a193e11481b89ef Mon Sep 17 00:00:00 2001
From: George Halkiadakis <gchalkiadakis@sklavenitis.co.gr>
Date: Sun, 12 Mar 2023 07:01:30 +0200
Subject: initializing classroom structure using anom framework

---
 classes/session/FilesSession.php | 142 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 classes/session/FilesSession.php

(limited to 'classes/session/FilesSession.php')

diff --git a/classes/session/FilesSession.php b/classes/session/FilesSession.php
new file mode 100644
index 0000000..8762776
--- /dev/null
+++ b/classes/session/FilesSession.php
@@ -0,0 +1,142 @@
+<?php
+
+/** FileSessionHandler
+ * is a custom File-based Session Handler
+ * 
+ * Could be useful when implemented along with data-cryptography,
+ * otherwise php's default session handler (which is also file-based)
+ * seems to be the obvious way to go;
+ * 
+ * NOTE:
+ * if shared sessions accros an array of servers is needed,
+ * a database-session handler is probably the best choice.
+ * 
+ * TODO:
+ * implement cryptography
+ */
+class FileSessionHandler implements SessionHandlerInterface
+{
+    /** The filesystem instance. */
+    protected $sessionName;
+
+    /** The path where all sessions should be stored. */
+    protected $path;
+
+    /** The number of minutes the session should be valid. */
+    protected $minutes;
+
+    /**
+     * Create a new file driven session-handler instance.
+     *
+     * @param  string  $path
+     * @param  int  $minutes
+     * @return void
+     */
+    public function __construct()
+    {
+        // values comming from configuration
+        $this->sess_filename = $path;
+        $this->minutes = $minutes;
+
+        // Set handler to overide SESSION
+        session_set_save_handler(
+            array($this, "open"),
+            array($this, "close"),
+            array($this, "read"),
+            array($this, "write"),
+            array($this, "destroy"),
+            array($this, "gc")
+        );
+
+        // Start the session
+        session_name(SESSION_NAME);
+        session_start();
+    }
+
+    /** open
+     * set filename;
+     * no need to touch the filesystem yet
+     * return true (always)
+     */
+    public function open($savePath, $sessionName): bool
+    {
+        $this->sess_filename = $this->$path .'/'. $sessionName;
+        return true;
+    }
+
+    /** close
+     * nothing needs to be closed;
+     * return true (always)
+     */
+    public function close(): bool
+    {
+        return true;
+    }
+
+    /** read
+     * chech if file exists; if not return false
+     * read data
+     */
+    public function read($sessionId): string|false
+    {
+        if (!file_exists($filename) || !is_readable($filename)) return false;
+        return file_get_contents($filename);
+
+        # if ($this->files->isFile($path = $this->path.'/'.$sessionId) &&
+        #     $this->files->lastModified($path) >= Carbon::now()->subMinutes($this->minutes)->getTimestamp()) {
+        #     return $this->files->sharedGet($path);
+        # }
+
+        # depricated? return '';
+    }
+
+    /** write
+     * data serielized already by php's internal session engine
+     */
+    public function write($sessionId, $data): bool
+    {
+        $h = fopen($filename, 'w');
+        if (fwrite($h,$data) === false) {
+            throw new Exception('Could not write session data');
+            return false;
+          }
+          fclose($h);
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return bool
+     */
+    public function destroy($sassionID): bool
+    {
+        unlink($this->sassionID);
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return int
+     */
+    public function gc($lifetime) : int
+    {
+        $files = Finder::create()
+                    ->in($this->path)
+                    ->files()
+                    ->ignoreDotFiles(true)
+                    ->date('<= now - '.$lifetime.' seconds');
+
+        $deletedSessions = 0;
+
+        foreach ($files as $file) {
+            $this->files->delete($file->getRealPath());
+            $deletedSessions++;
+        }
+
+        return $deletedSessions;
+    }
+}
-- 
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