Add invite links

backend/app/api/v1/marathons.py

@@ -18,6 +18,7 @@ from app.schemas import (
     MarathonUpdate,
     MarathonResponse,
     MarathonListItem,
+    MarathonPublicInfo,
     JoinMarathon,
     ParticipantInfo,
     ParticipantWithUser,
@@ -30,6 +31,35 @@ from app.schemas import (
 router = APIRouter(prefix="/marathons", tags=["marathons"])
 
 
+# Public endpoint (no auth required)
+@router.get("/by-code/{invite_code}", response_model=MarathonPublicInfo)
+async def get_marathon_by_code(invite_code: str, db: DbSession):
+    """Get public marathon info by invite code. No authentication required."""
+    result = await db.execute(
+        select(Marathon, func.count(Participant.id).label("participants_count"))
+        .outerjoin(Participant)
+        .options(selectinload(Marathon.creator))
+        .where(Marathon.invite_code == invite_code)
+        .group_by(Marathon.id)
+    )
+    row = result.first()
+
+    if not row:
+        raise HTTPException(status_code=404, detail="Marathon not found")
+
+    marathon = row[0]
+    participants_count = row[1]
+
+    return MarathonPublicInfo(
+        id=marathon.id,
+        title=marathon.title,
+        description=marathon.description,
+        status=marathon.status,
+        participants_count=participants_count,
+        creator_nickname=marathon.creator.nickname,
+    )
+
+
 def generate_invite_code() -> str:
     return secrets.token_urlsafe(8)
 

backend/app/schemas/__init__.py

@@ -12,6 +12,7 @@ from app.schemas.marathon import (
     MarathonUpdate,
     MarathonResponse,
     MarathonListItem,
+    MarathonPublicInfo,
     ParticipantInfo,
     ParticipantWithUser,
     JoinMarathon,
@@ -65,6 +66,7 @@ __all__ = [
     "MarathonUpdate",
     "MarathonResponse",
     "MarathonListItem",
+    "MarathonPublicInfo",
     "ParticipantInfo",
     "ParticipantWithUser",
     "JoinMarathon",

backend/app/schemas/marathon.py

@@ -79,6 +79,19 @@ class JoinMarathon(BaseModel):
     invite_code: str
 
 
+class MarathonPublicInfo(BaseModel):
+    """Public info about marathon for invite page (no auth required)"""
+    id: int
+    title: str
+    description: str | None
+    status: str
+    participants_count: int
+    creator_nickname: str
+
+    class Config:
+        from_attributes = True
+
+
 class LeaderboardEntry(BaseModel):
     rank: int
     user: UserPublic