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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional
4import secrets
5 
6app = FastAPI()
7 
8users = {}
9tokens = {}
10campaigns = {}
11donations = {}
12next_user_id = 1
13next_campaign_id = 1
14next_donation_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    description: Optional[str] = None
27 
28class DonationCreate(BaseModel):
29    campaign_id: int
30    amount: float
31    recurring: bool = False
32 
33def get_current_user(authorization: Optional[str] = Header(None)):
34    if not authorization:
35        raise HTTPException(status_code=401, detail="Missing auth header")
36    token = authorization.replace("Bearer ", "")
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    if any(u["username"] == req.username for u in users.values()):
45        raise HTTPException(status_code=400, detail="Username taken")
46    uid = next_user_id
47    next_user_id += 1
48    users[uid] = {"id": uid, "username": req.username, "password": req.password}
49    return {"id": uid, "username": req.username}
50 
51@app.post("/login")
52def login(req: LoginRequest):
53    for u in users.values():
54        if u["username"] == req.username and u["password"] == req.password:
55            token = secrets.token_hex(16)
56            tokens[token] = u["id"]
57            return {"token": token}
58    raise HTTPException(status_code=401, detail="Invalid credentials")
59 
60@app.get("/campaigns/{campaign_id}")
61def get_campaign(campaign_id: int):
62    if campaign_id not in campaigns:
63        raise HTTPException(status_code=404, detail="Campaign not found")
64    return campaigns[campaign_id]
65 
66@app.post("/campaigns")
67def create_campaign(req: CampaignCreate, authorization: Optional[str] = Header(None)):
68    user_id = get_current_user(authorization)
69    global next_campaign_id
70    cid = next_campaign_id
71    next_campaign_id += 1
72    campaigns[cid] = {"id": cid, "name": req.name, "description": req.description, "owner_id": user_id}
73    return campaigns[cid]
74 
75@app.get("/donors/{donor_id}")
76def get_donor(donor_id: int):
77    if donor_id not in users:
78        raise HTTPException(status_code=404, detail="Donor not found")
79    return {"id": users[donor_id]["id"], "username": users[donor_id]["username"]}
80 
81@app.post("/donations")
82def create_donation(req: DonationCreate, authorization: Optional[str] = Header(None)):
83    user_id = get_current_user(authorization)
84    if req.campaign_id not in campaigns:
85        raise HTTPException(status_code=404, detail="Campaign not found")
86    global next_donation_id
87    did = next_donation_id
88    next_donation_id += 1
89    donations[did] = {
90        "id": did,
91        "campaign_id": req.campaign_id,
92        "donor_id": user_id,
93        "amount": req.amount,
94        "recurring": req.recurring
95    }
96    return donations[did]
97 
98@app.get("/donations/{donation_id}")
99def get_donation(donation_id: int):
100    if donation_id not in donations:
101        raise HTTPException(status_code=404, detail="Donation not found")
102    return donations[donation_id]
103 
104@app.get("/campaigns/{campaign_id}/total")
105def get_campaign_total(campaign_id: int):
106    if campaign_id not in campaigns:
107        raise HTTPException(status_code=404, detail="Campaign not found")
108    total = sum(d["amount"] for d in donations.values() if d["campaign_id"] == campaign_id)
109    return {"campaign_id": campaign_id, "total_raised": total}
110 
111@app.get("/campaigns/{campaign_id}/history")
112def get_campaign_history(campaign_id: int):
113    if campaign_id not in campaigns:
114        raise HTTPException(status_code=404, detail="Campaign not found")
115    history = []
116    for d in donations.values():
117        if d["campaign_id"] == campaign_id:
118            history.append({
119                "donation_id": d["id"],
120                "amount": d["amount"],
121                "recurring": d["recurring"],
122                "donor_id": d["donor_id"]
123            })
124    return {"campaign_id": campaign_id, "donations": history}

1fastapi
2uvicorn