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1from fastapi import FastAPI, HTTPException, Header
2from typing import Optional
3import random
4import string
5 
6app = FastAPI()
7 
8# In-memory stores
9users = {}
10sessions = {}
11next_user_id = 1
12next_session_id = 1
13tokens = {}
14 
15def generate_token():
16    return ''.join(random.choices(string.ascii_letters + string.digits, k=32))
17 
18def get_current_user(authorization: Optional[str] = Header(None)):
19    if not authorization:
20        raise HTTPException(status_code=401, detail="Missing authorization header")
21    token = authorization.replace("Bearer ", "")
22    if token not in tokens:
23        raise HTTPException(status_code=401, detail="Invalid token")
24    return tokens[token]
25 
26@app.post("/signup")
27def signup(username: str, password: str):
28    global next_user_id
29    if username in [u["username"] for u in users.values()]:
30        raise HTTPException(status_code=400, detail="Username already exists")
31    user_id = next_user_id
32    next_user_id += 1
33    users[user_id] = {"id": user_id, "username": username, "password": password}
34    return {"id": user_id, "username": username}
35 
36@app.post("/login")
37def login(username: str, password: str):
38    for user in users.values():
39        if user["username"] == username and user["password"] == password:
40            token = generate_token()
41            tokens[token] = user["id"]
42            return {"token": token}
43    raise HTTPException(status_code=401, detail="Invalid credentials")
44 
45@app.get("/sessions/{session_id}")
46def get_session(session_id: int, authorization: Optional[str] = Header(None)):
47    get_current_user(authorization)
48    if session_id not in sessions:
49        raise HTTPException(status_code=404, detail="Session not found")
50    return sessions[session_id]
51 
52@app.post("/sessions")
53def create_session(title: str, speaker: str, room_number: str, time_slot: str, attendee_access_tier: str, authorization: Optional[str] = Header(None)):
54    get_current_user(authorization)
55    global next_session_id
56    session_id = next_session_id
57    next_session_id += 1
58    sessions[session_id] = {
59        "id": session_id,
60        "title": title,
61        "speaker": speaker,
62        "room_number": room_number,
63        "time_slot": time_slot,
64        "attendee_access_tier": attendee_access_tier
65    }
66    return sessions[session_id]
67 
68@app.put("/sessions/{session_id}")
69def update_session(session_id: int, title: Optional[str] = None, speaker: Optional[str] = None, room_number: Optional[str] = None, time_slot: Optional[str] = None, attendee_access_tier: Optional[str] = None, authorization: Optional[str] = Header(None)):
70    get_current_user(authorization)
71    if session_id not in sessions:
72        raise HTTPException(status_code=404, detail="Session not found")
73    if title is not None:
74        sessions[session_id]["title"] = title
75    if speaker is not None:
76        sessions[session_id]["speaker"] = speaker
77    if room_number is not None:
78        sessions[session_id]["room_number"] = room_number
79    if time_slot is not None:
80        sessions[session_id]["time_slot"] = time_slot
81    if attendee_access_tier is not None:
82        sessions[session_id]["attendee_access_tier"] = attendee_access_tier
83    return sessions[session_id]

1fastapi
2uvicorn