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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional
4import secrets
5 
6app = FastAPI()
7 
8campaigns = {}
9donations = {}
10users = {}
11tokens = {}
12next_campaign_id = 1
13next_donation_id = 1
14next_user_id = 1
15 
16class SignupRequest(BaseModel):
17    username: str
18    password: str
19 
20class LoginRequest(BaseModel):
21    username: str
22    password: str
23 
24class CampaignCreate(BaseModel):
25    name: str
26    target_amount: float
27 
28class DonationCreate(BaseModel):
29    campaign_id: int
30    amount: float
31    donor_name: Optional[str] = "Anonymous"
32 
33def get_current_user(authorization: str = Header(...)):
34    if not authorization.startswith("Bearer "):
35        raise HTTPException(status_code=401, detail="Invalid auth header")
36    token = authorization[7:]
37    if token not in tokens:
38        raise HTTPException(status_code=401, detail="Invalid token")
39    return tokens[token]
40 
41@app.post("/signup")
42def signup(req: SignupRequest):
43    global next_user_id
44    uid = next_user_id
45    next_user_id += 1
46    users[uid] = {"id": uid, "username": req.username, "password": req.password}
47    token = secrets.token_hex(16)
48    tokens[token] = uid
49    return {"user_id": uid, "token": token}
50 
51@app.post("/login")
52def login(req: LoginRequest):
53    for uid, u in users.items():
54        if u["username"] == req.username and u["password"] == req.password:
55            token = secrets.token_hex(16)
56            tokens[token] = uid
57            return {"user_id": uid, "token": token}
58    raise HTTPException(status_code=401, detail="Invalid credentials")
59 
60@app.post("/campaigns")
61def create_campaign(campaign: CampaignCreate, authorization: str = Header(...)):
62    get_current_user(authorization)
63    global next_campaign_id
64    cid = next_campaign_id
65    next_campaign_id += 1
66    campaigns[cid] = {
67        "id": cid,
68        "name": campaign.name,
69        "target_amount": campaign.target_amount,
70        "total_donations": 0.0,
71        "donation_count": 0
72    }
73    return campaigns[cid]
74 
75@app.get("/campaigns/{campaign_id}")
76def get_campaign(campaign_id: int, authorization: str = Header(...)):
77    get_current_user(authorization)
78    if campaign_id not in campaigns:
79        raise HTTPException(status_code=404, detail="Campaign not found")
80    return campaigns[campaign_id]
81 
82@app.post("/donations")
83def create_donation(donation: DonationCreate, authorization: str = Header(...)):
84    get_current_user(authorization)
85    global next_donation_id
86    if donation.campaign_id not in campaigns:
87        raise HTTPException(status_code=404, detail="Campaign not found")
88    did = next_donation_id
89    next_donation_id += 1
90    donations[did] = {
91        "id": did,
92        "campaign_id": donation.campaign_id,
93        "amount": donation.amount,
94        "donor_name": donation.donor_name
95    }
96    campaign = campaigns[donation.campaign_id]
97    campaign["total_donations"] += donation.amount
98    campaign["donation_count"] += 1
99    return donations[did]
100 
101@app.get("/donations/{donation_id}")
102def get_donation(donation_id: int, authorization: str = Header(...)):
103    get_current_user(authorization)
104    if donation_id not in donations:
105        raise HTTPException(status_code=404, detail="Donation not found")
106    return donations[donation_id]

1fastapi
2uvicorn