User management and module improvements

- Added daily_mirror module to permissions system
- Fixed user module management - updates now work correctly
- Implemented dashboard module filtering based on user permissions
- Fixed warehouse create_locations page (config parser and delete)
- Implemented POST-Redirect-GET pattern to prevent duplicate entries
- Added application license system with validation middleware
- Cleaned up debug logging code
- Improved user module selection with fetch API instead of form submit

py_app/app/__init__.py

@@ -20,6 +20,55 @@ def create_app():
     # Add 'now' function to Jinja2 globals
     app.jinja_env.globals['now'] = datetime.now
     
+    # Add license check middleware
+    @app.before_request
+    def check_license_middleware():
+        from flask import session, request, redirect, url_for, flash, render_template
+        import os
+        import json
+        from datetime import datetime
+        
+        # Skip license check for static files, login page, and superadmin users
+        if request.endpoint and (
+            request.endpoint == 'static' or
+            request.endpoint == 'main.login' or
+            request.path.startswith('/static/')
+        ):
+            return None
+        
+        # Skip if user is not logged in (will be redirected to login by other means)
+        if 'user' not in session:
+            return None
+        
+        # Skip license check for superadmin
+        if session.get('role') == 'superadmin':
+            return None
+        
+        # Check license validity
+        license_path = os.path.join(app.instance_path, 'app_license.json')
+        
+        if not os.path.exists(license_path):
+            session.clear()
+            flash('⚠️ Application License Missing - Please contact your superadmin to generate a license key.', 'danger')
+            return redirect(url_for('main.login'))
+        
+        try:
+            with open(license_path, 'r') as f:
+                license_data = json.load(f)
+            
+            valid_until = datetime.strptime(license_data['valid_until'], '%Y-%m-%d')
+            
+            if datetime.utcnow().date() > valid_until.date():
+                session.clear()
+                flash(f'⚠️ Application License Expired on {license_data["valid_until"]} - Please contact your superadmin to renew the license.', 'danger')
+                return redirect(url_for('main.login'))
+        except Exception as e:
+            session.clear()
+            flash('⚠️ License Validation Error - Please contact your superadmin.', 'danger')
+            return redirect(url_for('main.login'))
+        
+        return None
+    
     # Initialize automatic backup scheduler
     from app.backup_scheduler import init_backup_scheduler
     init_backup_scheduler(app)