Implement set user role from admin panel

db/sqlite.py

@@ -466,6 +466,15 @@ class DB:
             (until, user_id)
         )
 
+    def set_user_role(self, user_id, role):
+        return self.change_one('''
+            update users
+            set role = ?
+            where user_id = ?
+            ''',
+            (role, user_id)
+        )
+
     def change_one(self, query, values):
         db = self._db()
         c = db.cursor()

main.py

@@ -530,6 +530,19 @@ def admin_new_user():
         flash(str(e), 'error')
     return redirect(url_for('admin'))
 
+@app.route('/admin/user/<int:user_id>/edit/role/', methods = ['POST'])
+def admin_set_role(user_id):
+    try:
+        role = request.form['role']
+        if role not in ('0', '1', '2'):
+            flash(f'Invalid role type ({role})', 'error')
+        else:
+            db.set_user_role(user_id, role)
+            flash('Set user role', 'success')
+    except Exception as e:
+        flash(str(e), 'error')
+    return redirect(url_for('admin'))
+
 @app.route('/admin/restart/', methods = ['POST'])
 def admin_restart():
     chk, user = _admin_check()