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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 = {}
12campaign_id_counter = 1
13donation_id_counter = 1
14user_id_counter = 1
15 
16class SignupRequest(BaseModel):
17    email: str
18    password: str
19 
20class LoginRequest(BaseModel):
21    email: str
22    password: str
23 
24class CampaignCreate(BaseModel):
25    name: str
26    goal_amount: float
27    status: Optional[str] = "active"
28    tier: Optional[str] = None
29 
30class CampaignUpdate(BaseModel):
31    name: Optional[str] = None
32    goal_amount: Optional[float] = None
33    status: Optional[str] = None
34    tier: Optional[str] = None
35 
36class DonationCreate(BaseModel):
37    amount: float
38    donor_name: Optional[str] = None
39    campaign_id: int
40 
41def get_current_user(authorization: str = Header(None)):
42    if not authorization:
43        raise HTTPException(status_code=401, detail="Missing auth header")
44    token = authorization.replace("Bearer ", "")
45    if token not in tokens:
46        raise HTTPException(status_code=401, detail="Invalid token")
47    return tokens[token]
48 
49@app.post("/signup")
50def signup(req: SignupRequest):
51    global user_id_counter
52    for u in users.values():
53        if u["email"] == req.email:
54            raise HTTPException(status_code=400, detail="Email already exists")
55    user_id = user_id_counter
56    user_id_counter += 1
57    users[user_id] = {"id": user_id, "email": req.email, "password": req.password}
58    token = secrets.token_hex(16)
59    tokens[token] = user_id
60    return {"user_id": user_id, "token": token}
61 
62@app.post("/login")
63def login(req: LoginRequest):
64    for uid, u in users.items():
65        if u["email"] == req.email and u["password"] == req.password:
66            token = secrets.token_hex(16)
67            tokens[token] = uid
68            return {"token": token}
69    raise HTTPException(status_code=401, detail="Invalid credentials")
70 
71@app.post("/campaigns")
72def create_campaign(c: CampaignCreate, authorization: str = Header(None)):
73    get_current_user(authorization)
74    global campaign_id_counter
75    campaign_id = campaign_id_counter
76    campaign_id_counter += 1
77    campaigns[campaign_id] = {
78        "id": campaign_id,
79        "name": c.name,
80        "goal_amount": c.goal_amount,
81        "status": c.status,
82        "tier": c.tier
83    }
84    return campaigns[campaign_id]
85 
86@app.get("/campaigns/{campaign_id}")
87def get_campaign(campaign_id: int, authorization: str = Header(None)):
88    get_current_user(authorization)
89    if campaign_id not in campaigns:
90        raise HTTPException(status_code=404, detail="Campaign not found")
91    return campaigns[campaign_id]
92 
93@app.put("/campaigns/{campaign_id}")
94def update_campaign(campaign_id: int, c: CampaignUpdate, authorization: str = Header(None)):
95    get_current_user(authorization)
96    if campaign_id not in campaigns:
97        raise HTTPException(status_code=404, detail="Campaign not found")
98    camp = campaigns[campaign_id]
99    if c.name is not None:
100        camp["name"] = c.name
101    if c.goal_amount is not None:
102        camp["goal_amount"] = c.goal_amount
103    if c.status is not None:
104        camp["status"] = c.status
105    if c.tier is not None:
106        camp["tier"] = c.tier
107    return camp
108 
109@app.post("/donations")
110def create_donation(d: DonationCreate, authorization: str = Header(None)):
111    get_current_user(authorization)
112    global donation_id_counter
113    if d.campaign_id not in campaigns:
114        raise HTTPException(status_code=404, detail="Campaign not found")
115    donation_id = donation_id_counter
116    donation_id_counter += 1
117    donations[donation_id] = {
118        "id": donation_id,
119        "amount": d.amount,
120        "donor_name": d.donor_name,
121        "campaign_id": d.campaign_id
122    }
123    return donations[donation_id]
124 
125@app.get("/donations/{donation_id}")
126def get_donation(donation_id: int, authorization: str = Header(None)):
127    get_current_user(authorization)
128    if donation_id not in donations:
129        raise HTTPException(status_code=404, detail="Donation not found")
130    return donations[donation_id]

1fastapi
2uvicorn