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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional, List
4import secrets
5import hashlib
6 
7app = FastAPI()
8 
9users = {}
10tokens = {}
11recipes = {}
12recipe_id_counter = 1
13 
14def get_current_user(authorization: str = Header(None)):
15    if not authorization:
16        raise HTTPException(status_code=401, detail="Missing auth header")
17    token = authorization.replace("Bearer ", "")
18    if token not in tokens:
19        raise HTTPException(status_code=401, detail="Invalid token")
20    return tokens[token]
21 
22class SignupRequest(BaseModel):
23    username: str
24    password: str
25 
26class LoginRequest(BaseModel):
27    username: str
28    password: str
29 
30class RecipeCreate(BaseModel):
31    title: str
32    ingredients: List[str]
33    instructions: str
34    difficulty: str = "medium"
35    is_vegetarian: bool = False
36 
37class RecipeUpdate(BaseModel):
38    ingredients: Optional[List[str]] = None
39    instructions: Optional[str] = None
40    difficulty: Optional[str] = None
41    is_vegetarian: Optional[bool] = None
42 
43@app.post("/signup")
44def signup(req: SignupRequest):
45    if req.username in users:
46        raise HTTPException(status_code=400, detail="Username taken")
47    users[req.username] = hashlib.sha256(req.password.encode()).hexdigest()
48    token = secrets.token_hex(16)
49    tokens[token] = req.username
50    return {"token": token}
51 
52@app.post("/login")
53def login(req: LoginRequest):
54    if req.username not in users:
55        raise HTTPException(status_code=400, detail="Invalid credentials")
56    if users[req.username] != hashlib.sha256(req.password.encode()).hexdigest():
57        raise HTTPException(status_code=400, detail="Invalid credentials")
58    token = secrets.token_hex(16)
59    tokens[token] = req.username
60    return {"token": token}
61 
62@app.post("/recipes")
63def create_recipe(recipe: RecipeCreate, authorization: str = Header(None)):
64    get_current_user(authorization)
65    global recipe_id_counter
66    recipe_id = recipe_id_counter
67    recipe_id_counter += 1
68    recipes[recipe_id] = {
69        "id": recipe_id,
70        "title": recipe.title,
71        "ingredients": recipe.ingredients,
72        "instructions": recipe.instructions,
73        "difficulty": recipe.difficulty,
74        "is_vegetarian": recipe.is_vegetarian
75    }
76    return recipes[recipe_id]
77 
78@app.get("/recipes/{recipe_id}")
79def get_recipe(recipe_id: int, authorization: str = Header(None)):
80    get_current_user(authorization)
81    if recipe_id not in recipes:
82        raise HTTPException(status_code=404, detail="Recipe not found")
83    return recipes[recipe_id]
84 
85@app.patch("/recipes/{recipe_id}")
86def update_recipe(recipe_id: int, update: RecipeUpdate, authorization: str = Header(None)):
87    get_current_user(authorization)
88    if recipe_id not in recipes:
89        raise HTTPException(status_code=404, detail="Recipe not found")
90    recipe = recipes[recipe_id]
91    if update.ingredients is not None:
92        recipe["ingredients"] = update.ingredients
93    if update.instructions is not None:
94        recipe["instructions"] = update.instructions
95    if update.difficulty is not None:
96        recipe["difficulty"] = update.difficulty
97    if update.is_vegetarian is not None:
98        recipe["is_vegetarian"] = update.is_vegetarian
99    return recipe

1fastapi
2uvicorn