token-validator: use cookies instead of localStorage to store auth token

token-validator/db.go

@@ -109,7 +109,7 @@ CREATE TABLE IF NOT EXISTS student_pong(
 	if _, err := db.Exec(`
 CREATE TABLE IF NOT EXISTS student_sessions(
   id_session BLOB(255) NOT NULL,
-  id_student INTEGER NOT NULL,
+  id_student INTEGER,
   time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   FOREIGN KEY(id_student) REFERENCES students(id_student)
 ) DEFAULT CHARACTER SET = utf8 COLLATE = utf8_bin;