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1from fastapi import FastAPI, HTTPException, Header
2from typing import Optional
3import secrets
4 
5app = FastAPI()
6 
7users = {}
8campaigns = {}
9donations = {}
10tokens = {}
11 
12user_id_counter = 1
13campaign_id_counter = 1
14donation_id_counter = 1
15 
16# Pre-seed some campaigns
17campaigns[1] = {"id": 1, "name": "Clean Water for Village", "description": "Help bring clean water to rural areas", "amount_raised": 0, "donor_count": 0}
18campaigns[2] = {"id": 2, "name": "School Supplies Drive", "description": "Provide notebooks and pencils to underprivileged children", "amount_raised": 0, "donor_count": 0}
19campaign_id_counter = 3
20 
21def get_current_user(authorization: str = Header(None)):
22    if not authorization:
23        raise HTTPException(status_code=401, detail="Missing auth token")
24    token = authorization.replace("Bearer ", "")
25    if token not in tokens:
26        raise HTTPException(status_code=401, detail="Invalid token")
27    return tokens[token]
28 
29@app.post("/signup")
30def signup(username: str, password: str):
31    global user_id_counter
32    for u in users.values():
33        if u["username"] == username:
34            raise HTTPException(status_code=400, detail="Username already exists")
35    user_id = user_id_counter
36    users[user_id] = {"id": user_id, "username": username, "password": password}
37    user_id_counter += 1
38    return {"id": user_id, "username": username}
39 
40@app.post("/login")
41def login(username: str, password: str):
42    for u in users.values():
43        if u["username"] == username and u["password"] == password:
44            token = secrets.token_hex(16)
45            tokens[token] = u["id"]
46            return {"token": token}
47    raise HTTPException(status_code=401, detail="Invalid credentials")
48 
49@app.get("/campaigns")
50def get_campaigns():
51    return list(campaigns.values())
52 
53@app.get("/campaign/{campaign_id}")
54def get_campaign(campaign_id: int):
55    if campaign_id not in campaigns:
56        raise HTTPException(status_code=404, detail="Campaign not found")
57    return campaigns[campaign_id]
58 
59@app.post("/campaign")
60def create_campaign(name: str, description: str, authorization: str = Header(None)):
61    user_id = get_current_user(authorization)
62    global campaign_id_counter
63    campaign_id = campaign_id_counter
64    campaigns[campaign_id] = {"id": campaign_id, "name": name, "description": description, "amount_raised": 0, "donor_count": 0, "created_by": user_id}
65    campaign_id_counter += 1
66    return campaigns[campaign_id]
67 
68@app.post("/donate")
69def donate(campaign_id: int, amount: float, anonymous: bool = False, authorization: str = Header(None)):
70    user_id = get_current_user(authorization)
71    if campaign_id not in campaigns:
72        raise HTTPException(status_code=404, detail="Campaign not found")
73    global donation_id_counter
74    donation_id = donation_id_counter
75    donations[donation_id] = {"id": donation_id, "campaign_id": campaign_id, "amount": amount, "anonymous": anonymous, "donor_id": user_id}
76    donation_id_counter += 1
77    campaigns[campaign_id]["amount_raised"] += amount
78    campaigns[campaign_id]["donor_count"] += 1
79    return donations[donation_id]
80 
81@app.get("/donation/{donation_id}")
82def get_donation(donation_id: int):
83    if donation_id not in donations:
84        raise HTTPException(status_code=404, detail="Donation not found")
85    return donations[donation_id]
86 
87@app.get("/user/{user_id}")
88def get_user(user_id: int):
89    if user_id not in users:
90        raise HTTPException(status_code=404, detail="User not found")
91    return {"id": users[user_id]["id"], "username": users[user_id]["username"]}

1fastapi
2uvicorn