From 637cfe967f45ef9ea96e7e18b937554fbb0aab81 Mon Sep 17 00:00:00 2001
From: Space-Banane <paulwaehner923@gmail.com>
Date: Wed, 20 May 2026 21:53:36 +0200
Subject: [PATCH] Add session expiry tracking and enforcement

---
 backend/main.py | 47 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 3 deletions(-)

diff --git a/backend/main.py b/backend/main.py
index 775ac51..297711c 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -18,6 +18,7 @@ from pydantic import BaseModel
 STATIC_DIR = Path("frontend/dist")
 PUBLIC_DIR = Path("public")
 SESSION_COOKIE = "jellomator_session"
+SESSION_TTL_SECONDS = int(os.getenv("SESSION_TTL_SECONDS", "86400"))
 DB_HOST = os.getenv("DB_HOST", "mariadb")
 DB_PORT = int(os.getenv("DB_PORT", "3306"))
 DB_USER = os.getenv("DB_USER", "jellomator")
@@ -80,10 +81,18 @@ def init_db():
                 token varchar(255) primary key,
                 user_id bigint not null,
                 created_at varchar(64) not null,
+                expires_at varchar(64) null,
+                last_seen_at varchar(64) null,
                 index (user_id),
                 constraint sessions_user_fk foreign key (user_id) references users(id) on delete cascade
             ) engine=InnoDB default charset=utf8mb4
             """)
+            cur.execute("show columns from sessions like 'expires_at'")
+            if cur.fetchone() is None:
+                cur.execute("alter table sessions add column expires_at varchar(64) null after created_at")
+            cur.execute("show columns from sessions like 'last_seen_at'")
+            if cur.fetchone() is None:
+                cur.execute("alter table sessions add column last_seen_at varchar(64) null after expires_at")
             cur.execute("""
             create table if not exists links(
                 id bigint auto_increment primary key,
@@ -121,15 +130,43 @@ class LoginIn(BaseModel):
     password: str
 
 
+def utc_now_iso() -> str:
+    return datetime.utcnow().isoformat()
+
+
+def expires_at_iso() -> str:
+    now = datetime.utcnow().timestamp()
+    return datetime.utcfromtimestamp(now + SESSION_TTL_SECONDS).isoformat()
+
+
 def current_user(request: Request):
     token = request.cookies.get(SESSION_COOKIE)
     if not token:
         return None
     with db() as c:
         with c.cursor() as cur:
-            cur.execute("select u.username,u.role from sessions s join users u on u.id=s.user_id where s.token=%s", (token,))
+            cur.execute(
+                "select s.expires_at,u.username,u.role from sessions s join users u on u.id=s.user_id where s.token=%s",
+                (token,),
+            )
             row = cur.fetchone()
-    return row if row else None
+            if not row:
+                return None
+            expires_at = row.get("expires_at")
+            now = datetime.utcnow()
+            if expires_at:
+                try:
+                    if now >= datetime.fromisoformat(expires_at):
+                        cur.execute("delete from sessions where token=%s", (token,))
+                        return None
+                except ValueError:
+                    cur.execute("delete from sessions where token=%s", (token,))
+                    return None
+            cur.execute(
+                "update sessions set last_seen_at=%s where token=%s",
+                (utc_now_iso(), token),
+            )
+    return {"username": row["username"], "role": row["role"]}
 
 
 def require_admin(request: Request):
@@ -179,7 +216,11 @@ def login(inp: LoginIn):
             raise HTTPException(401, "Invalid credentials")
         token = secrets.token_urlsafe(32)
         with c.cursor() as cur:
-            cur.execute("insert into sessions(token,user_id,created_at) values (%s,%s,%s)", (token, row["id"], datetime.utcnow().isoformat()))
+            now = utc_now_iso()
+            cur.execute(
+                "insert into sessions(token,user_id,created_at,expires_at,last_seen_at) values (%s,%s,%s,%s,%s)",
+                (token, row["id"], now, expires_at_iso(), now),
+            )
     response = JSONResponse({"ok": True})
     response.set_cookie(SESSION_COOKIE, token, httponly=True, samesite="lax", secure=False, path="/")
     return response