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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional
4import random
5import string
6 
7app = FastAPI()
8 
9users = {}
10events = {}
11orders = {}
12tokens = {}
13next_user_id = 1
14next_event_id = 1
15next_order_id = 1
16 
17def generate_token():
18    return ''.join(random.choices(string.ascii_letters + string.digits, k=32))
19 
20def get_current_user(authorization: Optional[str] = Header(None)):
21    if not authorization:
22        raise HTTPException(status_code=401, detail="No auth header")
23    token = authorization.replace("Bearer ", "")
24    user_id = tokens.get(token)
25    if not user_id:
26        raise HTTPException(status_code=401, detail="Invalid token")
27    return user_id
28 
29class UserCreate(BaseModel):
30    username: str
31    password: str
32 
33class LoginRequest(BaseModel):
34    username: str
35    password: str
36 
37class EventCreate(BaseModel):
38    title: str
39    speaker: str
40    date: str
41    capacity: int
42    price: float
43 
44class PurchaseRequest(BaseModel):
45    event_id: int
46 
47@app.post("/signup")
48def signup(user: UserCreate):
49    global next_user_id
50    for u in users.values():
51        if u["username"] == user.username:
52            raise HTTPException(status_code=400, detail="User exists")
53    user_id = next_user_id
54    next_user_id += 1
55    users[user_id] = {"id": user_id, "username": user.username, "password": user.password}
56    token = generate_token()
57    tokens[token] = user_id
58    return {"user_id": user_id, "token": token}
59 
60@app.post("/login")
61def login(req: LoginRequest):
62    for uid, u in users.items():
63        if u["username"] == req.username and u["password"] == req.password:
64            token = generate_token()
65            tokens[token] = uid
66            return {"token": token}
67    raise HTTPException(status_code=401, detail="Invalid credentials")
68 
69@app.get("/events")
70def list_events():
71    upcoming = [e for e in events.values() if e["capacity"] > 0]
72    return {"events": upcoming}
73 
74@app.get("/events/{event_id}")
75def get_event(event_id: int):
76    event = events.get(event_id)
77    if not event:
78        raise HTTPException(status_code=404, detail="Event not found")
79    return event
80 
81@app.post("/events")
82def create_event(event: EventCreate, authorization: Optional[str] = Header(None)):
83    get_current_user(authorization)
84    global next_event_id
85    event_id = next_event_id
86    next_event_id += 1
87    events[event_id] = {
88        "id": event_id,
89        "title": event.title,
90        "speaker": event.speaker,
91        "date": event.date,
92        "capacity": event.capacity,
93        "price": event.price
94    }
95    return events[event_id]
96 
97@app.post("/purchase")
98def purchase_ticket(purchase: PurchaseRequest, authorization: Optional[str] = Header(None)):
99    user_id = get_current_user(authorization)
100    event = events.get(purchase.event_id)
101    if not event:
102        raise HTTPException(status_code=404, detail="Event not found")
103    if event["capacity"] <= 0:
104        raise HTTPException(status_code=400, detail="Event sold out")
105    event["capacity"] -= 1
106    global next_order_id
107    order_id = next_order_id
108    next_order_id += 1
109    join_link = f"https://zoom.us/j/{random.randint(100000000, 999999999)}"
110    orders[order_id] = {
111        "id": order_id,
112        "user_id": user_id,
113        "event_id": purchase.event_id,
114        "join_link": join_link
115    }
116    return {
117        "order_id": order_id,
118        "event_title": event["title"],
119        "join_link": join_link,
120        "message": "Confirmation sent (simulated)"
121    }
122 
123@app.get("/orders/{order_id}")
124def get_order(order_id: int, authorization: Optional[str] = Header(None)):
125    get_current_user(authorization)
126    order = orders.get(order_id)
127    if not order:
128        raise HTTPException(status_code=404, detail="Order not found")
129    return order

1fastapi
2uvicorn