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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional
4import secrets
5import time
6 
7app = FastAPI()
8 
9users = {}
10tokens = {}
11campaigns = {}
12donations = {}
13next_user_id = 1
14next_campaign_id = 1
15next_donation_id = 1
16 
17def get_current_user(authorization: str = Header(None)):
18    if not authorization:
19        raise HTTPException(status_code=401, detail="Missing auth header")
20    token = authorization.replace("Bearer ", "")
21    if token not in tokens:
22        raise HTTPException(status_code=401, detail="Invalid token")
23    return tokens[token]
24 
25class SignupRequest(BaseModel):
26    username: str
27    password: str
28 
29class LoginRequest(BaseModel):
30    username: str
31    password: str
32 
33class CampaignCreate(BaseModel):
34    name: str
35    target_amount: float
36 
37class DonationCreate(BaseModel):
38    campaign_id: int
39    amount: float
40    recurring: bool = False
41 
42@app.post("/signup")
43def signup(req: SignupRequest):
44    global next_user_id
45    if req.username in [u["username"] for u in users.values()]:
46        raise HTTPException(status_code=400, detail="Username taken")
47    user_id = next_user_id
48    next_user_id += 1
49    users[user_id] = {"id": user_id, "username": req.username, "password": req.password}
50    return {"id": user_id, "username": req.username}
51 
52@app.post("/login")
53def login(req: LoginRequest):
54    for uid, u in users.items():
55        if u["username"] == req.username and u["password"] == req.password:
56            token = secrets.token_hex(16)
57            tokens[token] = uid
58            return {"token": token, "user_id": uid}
59    raise HTTPException(status_code=401, detail="Invalid credentials")
60 
61@app.get("/user/{user_id}")
62def get_user(user_id: int):
63    if user_id not in users:
64        raise HTTPException(status_code=404, detail="User not found")
65    return users[user_id]
66 
67@app.post("/campaign")
68def create_campaign(req: CampaignCreate, authorization: str = Header(None)):
69    current_user = get_current_user(authorization)
70    global next_campaign_id
71    campaign_id = next_campaign_id
72    next_campaign_id += 1
73    campaigns[campaign_id] = {
74        "id": campaign_id,
75        "name": req.name,
76        "target_amount": req.target_amount,
77        "total_raised": 0.0,
78        "created_by": current_user
79    }
80    return campaigns[campaign_id]
81 
82@app.get("/campaign/{campaign_id}")
83def get_campaign(campaign_id: int):
84    if campaign_id not in campaigns:
85        raise HTTPException(status_code=404, detail="Campaign not found")
86    return campaigns[campaign_id]
87 
88@app.post("/donation")
89def create_donation(req: DonationCreate, authorization: str = Header(None)):
90    current_user = get_current_user(authorization)
91    if req.campaign_id not in campaigns:
92        raise HTTPException(status_code=404, detail="Campaign not found")
93    global next_donation_id
94    donation_id = next_donation_id
95    next_donation_id += 1
96    donation = {
97        "id": donation_id,
98        "campaign_id": req.campaign_id,
99        "user_id": current_user,
100        "amount": req.amount,
101        "recurring": req.recurring,
102        "timestamp": time.time()
103    }
104    donations[donation_id] = donation
105    campaigns[req.campaign_id]["total_raised"] += req.amount
106    return donation
107 
108@app.get("/donation/{donation_id}")
109def get_donation(donation_id: int):
110    if donation_id not in donations:
111        raise HTTPException(status_code=404, detail="Donation not found")
112    return donations[donation_id]
113 
114@app.get("/campaign/{campaign_id}/rankings")
115def get_campaign_rankings(campaign_id: int):
116    if campaign_id not in campaigns:
117        raise HTTPException(status_code=404, detail="Campaign not found")
118    user_totals = {}
119    for d in donations.values():
120        if d["campaign_id"] == campaign_id:
121            uid = d["user_id"]
122            user_totals[uid] = user_totals.get(uid, 0) + d["amount"]
123    sorted_users = sorted(user_totals.items(), key=lambda x: x[1], reverse=True)
124    rankings = []
125    for rank, (uid, total) in enumerate(sorted_users, start=1):
126        username = users.get(uid, {}).get("username", "unknown")
127        rankings.append({"rank": rank, "user_id": uid, "username": username, "total_donated": total})
128    return rankings

1fastapi
2uvicorn