init backend presensi

app/Modules/Attendance/Models/QrAttendanceTokenModel.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Modules\Attendance\Models;
+
+use CodeIgniter\Model;
+
+/**
+ * Token QR untuk absen mapel: guru generate, siswa scan.
+ */
+class QrAttendanceTokenModel extends Model
+{
+    protected $table            = 'qr_attendance_tokens';
+    protected $primaryKey       = 'id';
+    protected $useAutoIncrement = true;
+    protected $returnType       = 'array';
+    protected $allowedFields    = [
+        'schedule_id',
+        'token',
+        'expires_at',
+        'created_by_user_id',
+    ];
+    protected $useTimestamps = true;
+    protected $dateFormat    = 'datetime';
+    protected $createdField  = 'created_at';
+    protected $updatedField  = 'updated_at';
+
+    /** Token valid (default) 15 menit */
+    public const VALID_MINUTES = 15;
+
+    /**
+     * Generate token untuk schedule_id. Returns token string or null on failure.
+     */
+    public function generateForSchedule(int $scheduleId, ?int $createdByUserId = null): ?string
+    {
+        $token = bin2hex(random_bytes(16));
+        $expires = date('Y-m-d H:i:s', strtotime('+' . self::VALID_MINUTES . ' minutes'));
+
+        $id = $this->insert([
+            'schedule_id'         => $scheduleId,
+            'token'               => $token,
+            'expires_at'          => $expires,
+            'created_by_user_id'  => $createdByUserId,
+        ]);
+
+        return $id ? $token : null;
+    }
+
+    /**
+     * Validate token: return row (schedule_id, expires_at) if valid and not expired; null otherwise.
+     */
+    public function validateToken(string $token): ?array
+    {
+        $row = $this->where('token', $token)->first();
+        if (!$row || !is_array($row)) {
+            return null;
+        }
+        $expiresAt = $row['expires_at'] ?? null;
+        if (!$expiresAt || strtotime($expiresAt) < time()) {
+            return null;
+        }
+        return [
+            'schedule_id' => (int) $row['schedule_id'],
+            'expires_at'  => $row['expires_at'],
+        ];
+    }
+}