Create app/main.py

app/main.py

@@ -0,0 +1,122 @@
+from fastapi import FastAPI, Depends, HTTPException, status, File, UploadFile, Response
+from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from pydantic import BaseModel
+from datetime import datetime, timedelta
+from io import BytesIO
+from PIL import Image, ImageDraw
+import numpy as np
+from ultralytics import YOLO
+
+# Configuración JWT
+SECRET_KEY = "clave-ultra-secreta"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+# Hash de contraseñas
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# Base de datos falsa
+fake_users_db = {
+    "uriel": {
+        "username": "uriel",
+        "full_name": "Uriel Escalona",
+        "email": "uriel@example.com",
+        "hashed_password": pwd_context.hash("1234"),
+        "disabled": False
+    }
+}
+
+# Modelos
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+class TokenData(BaseModel):
+    username: str | None = None
+
+class User(BaseModel):
+    username: str
+    full_name: str
+    email: str
+    disabled: bool | None = None
+
+class UserInDB(User):
+    hashed_password: str
+
+# Autenticación
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+app = FastAPI()
+model = YOLO("yolov8n.pt")
+
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_user(db, username: str):
+    if username in db:
+        user_dict = db[username]
+        return UserInDB(**user_dict)
+
+def authenticate_user(db, username: str, password: str):
+    user = get_user(db, username)
+    if not user or not verify_password(password, user.hashed_password):
+        return False
+    return user
+
+def create_access_token(data: dict, expires_delta: timedelta | None = None):
+    to_encode = data.copy()
+    expire = datetime.utcnow() + (expires_delta or timedelta(minutes=15))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+async def get_current_user(token: str = Depends(oauth2_scheme)):
+    credentials_exception = HTTPException(
+        status_code=401,
+        detail="No autorizado",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+        user = get_user(fake_users_db, username)
+        if user is None:
+            raise credentials_exception
+        return user
+    except JWTError:
+        raise credentials_exception
+
+# Endpoint para login
+@app.post("/token", response_model=Token)
+async def login(form_data: OAuth2PasswordRequestForm = Depends()):
+    user = authenticate_user(fake_users_db, form_data.username, form_data.password)
+    if not user:
+        raise HTTPException(status_code=401, detail="Credenciales inválidas")
+    access_token = create_access_token(data={"sub": user.username}, expires_delta=timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
+    return {"access_token": access_token, "token_type": "bearer"}
+
+# Endpoint protegido: recibe imagen y devuelve con cajas
+@app.post("/detectar/")
+async def detectar_yolo(file: UploadFile = File(...), current_user: User = Depends(get_current_user)):
+    contents = await file.read()
+    image = Image.open(BytesIO(contents)).convert("RGB")
+    img_array = np.array(image)
+
+    results = model.predict(img_array)
+    draw = ImageDraw.Draw(image)
+
+    for r in results:
+        for box in r.boxes:
+            cls = int(box.cls[0])
+            label = model.names[cls]
+            bbox = box.xyxy[0].tolist()
+            draw.rectangle(bbox, outline="red", width=2)
+            draw.text((bbox[0], bbox[1]), label, fill="white")
+
+    output = BytesIO()
+    image.save(output, format="PNG")
+    output.seek(0)
+    return Response(content=output.read(), media_type="image/png")