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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional
4import secrets
5 
6app = FastAPI()
7 
8users = {}
9tokens = {}
10listings = {}
11listing_id_counter = 1
12 
13class SignupRequest(BaseModel):
14    username: str
15    password: str
16 
17class LoginRequest(BaseModel):
18    username: str
19    password: str
20 
21class ListingCreate(BaseModel):
22    title: str
23    price: float
24    condition: str
25    is_featured: Optional[bool] = False
26    seller_tier: Optional[str] = "standard"
27 
28class ListingUpdate(BaseModel):
29    title: Optional[str] = None
30    price: Optional[float] = None
31    condition: Optional[str] = None
32    is_featured: Optional[bool] = None
33    seller_tier: Optional[str] = None
34 
35@app.post("/signup")
36def signup(req: SignupRequest):
37    if req.username in users:
38        raise HTTPException(400, "User exists")
39    users[req.username] = {"password": req.password}
40    return {"ok": True}
41 
42@app.post("/login")
43def login(req: LoginRequest):
44    user = users.get(req.username)
45    if not user or user["password"] != req.password:
46        raise HTTPException(401, "Invalid credentials")
47    token = secrets.token_hex(16)
48    tokens[token] = req.username
49    return {"token": token}
50 
51def get_current_user(authorization: str = Header(...)):
52    token = authorization.replace("Bearer ", "")
53    if token not in tokens:
54        raise HTTPException(401, "Invalid token")
55    return tokens[token]
56 
57@app.post("/listings")
58def create_listing(listing: ListingCreate, user: str = Header(...)):
59    global listing_id_counter
60    listing_id = listing_id_counter
61    listing_id_counter += 1
62    listings[listing_id] = {
63        "id": listing_id,
64        "title": listing.title,
65        "price": listing.price,
66        "condition": listing.condition,
67        "is_featured": listing.is_featured,
68        "seller_tier": listing.seller_tier,
69        "seller": user
70    }
71    return listings[listing_id]
72 
73@app.get("/listings/{listing_id}")
74def get_listing(listing_id: int):
75    if listing_id not in listings:
76        raise HTTPException(404, "Not found")
77    return listings[listing_id]
78 
79@app.patch("/listings/{listing_id}")
80def update_listing(listing_id: int, update: ListingUpdate, user: str = Header(...)):
81    if listing_id not in listings:
82        raise HTTPException(404, "Not found")
83    listing = listings[listing_id]
84    if update.title is not None:
85        listing["title"] = update.title
86    if update.price is not None:
87        listing["price"] = update.price
88    if update.condition is not None:
89        listing["condition"] = update.condition
90    if update.is_featured is not None:
91        listing["is_featured"] = update.is_featured
92    if update.seller_tier is not None:
93        listing["seller_tier"] = update.seller_tier
94    return listing

1fastapi
2uvicorn