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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 
17class SignupRequest(BaseModel):
18    username: str
19    password: str
20 
21class LoginRequest(BaseModel):
22    username: str
23    password: str
24 
25class CampaignCreate(BaseModel):
26    goal_amount: float
27    title: str
28 
29class DonateRequest(BaseModel):
30    campaign_id: int
31    amount: float
32    message: str = ""
33 
34def get_user_id(authorization: str = Header(...)):
35    token = authorization.replace("Bearer ", "")
36    if token not in tokens:
37        raise HTTPException(status_code=401, detail="Invalid token")
38    return tokens[token]
39 
40@app.post("/signup")
41def signup(req: SignupRequest):
42    global next_user_id
43    user_id = next_user_id
44    next_user_id += 1
45    users[user_id] = {"username": req.username, "password": req.password}
46    return {"user_id": user_id, "message": "User created"}
47 
48@app.post("/login")
49def login(req: LoginRequest):
50    for uid, u in users.items():
51        if u["username"] == req.username and u["password"] == req.password:
52            token = secrets.token_hex(16)
53            tokens[token] = uid
54            return {"token": token}
55    raise HTTPException(status_code=401, detail="Invalid credentials")
56 
57@app.get("/campaigns")
58def get_campaigns():
59    result = []
60    for cid, c in campaigns.items():
61        total_raised = sum(d["amount"] for d in donations.values() if d["campaign_id"] == cid)
62        donor_count = len(set(d["user_id"] for d in donations.values() if d["campaign_id"] == cid))
63        result.append({
64            "id": cid,
65            "title": c["title"],
66            "goal_amount": c["goal_amount"],
67            "raised": total_raised,
68            "donor_count": donor_count
69        })
70    return result
71 
72@app.post("/donate")
73def donate(req: DonateRequest, authorization: str = Header(...)):
74    user_id = get_user_id(authorization)
75    if req.campaign_id not in campaigns:
76        raise HTTPException(status_code=404, detail="Campaign not found")
77    global next_donation_id
78    donation_id = next_donation_id
79    next_donation_id += 1
80    donations[donation_id] = {
81        "id": donation_id,
82        "campaign_id": req.campaign_id,
83        "user_id": user_id,
84        "amount": req.amount,
85        "message": req.message,
86        "timestamp": time.time()
87    }
88    return {"donation_id": donation_id, "message": "Donation recorded"}
89 
90@app.get("/campaigns/{campaign_id}")
91def get_campaign(campaign_id: int):
92    if campaign_id not in campaigns:
93        raise HTTPException(status_code=404, detail="Campaign not found")
94    c = campaigns[campaign_id]
95    total_raised = sum(d["amount"] for d in donations.values() if d["campaign_id"] == campaign_id)
96    donor_count = len(set(d["user_id"] for d in donations.values() if d["campaign_id"] == campaign_id))
97    return {
98        "id": campaign_id,
99        "title": c["title"],
100        "goal_amount": c["goal_amount"],
101        "raised": total_raised,
102        "donor_count": donor_count
103    }
104 
105@app.post("/campaigns")
106def create_campaign(req: CampaignCreate, authorization: str = Header(...)):
107    user_id = get_user_id(authorization)
108    global next_campaign_id
109    campaign_id = next_campaign_id
110    next_campaign_id += 1
111    campaigns[campaign_id] = {
112        "id": campaign_id,
113        "title": req.title,
114        "goal_amount": req.goal_amount,
115        "owner_id": user_id
116    }
117    return {"campaign_id": campaign_id, "message": "Campaign created"}

1fastapi
2uvicorn