From 4a3827f7c072b50a84c5656c2cb56cea8fcf589b Mon Sep 17 00:00:00 2001
From: Valentin CZERYBA <valcze80@gmail.com>
Date: Wed, 11 Oct 2023 23:45:12 +0200
Subject: [PATCH] add dependencies

---
 app/dependencies.py   | 74 +++++++++++++++++++++++++++++++++++++++++++
 app/main.py           |  1 +
 app/models/users.py   | 13 ++++----
 app/routers/events.py |  0
 app/routers/users.py  | 10 ++++++
 5 files changed, 91 insertions(+), 7 deletions(-)
 create mode 100644 app/dependencies.py
 create mode 100644 app/routers/events.py

diff --git a/app/dependencies.py b/app/dependencies.py
new file mode 100644
index 0000000..c34a1f7
--- /dev/null
+++ b/app/dependencies.py
@@ -0,0 +1,74 @@
+from datetime import datetime, timedelta
+from typing import Annotated
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+
+
+fake_users = [
+    # password foo
+    {'id': 1, 'username': 'admin', 'password': '$2b$12$N.i74Kle18n5Toxhas.rVOjZreVC2WM34fCidNDyhSNgxVlbKwX7i',
+     'permissions': ['items:read', 'items:write', 'users:read', 'users:write']
+    },
+    # password bar
+    {'id': 2, 'username': 'client', 'password': '$2b$12$KUgpw1m0LF/s9NS1ZB5rRO2cA5D13MqRm56ab7ik2ixftXW/aqEyq',
+     'permissions': ['items:read']}
+]
+
+SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password):
+    return pwd_context.hash(password)
+
+def get_user(db, username: str):
+    for user in db:
+        if username == user.username:
+            return UserInDB(**user)
+
+def authenticate_user(fake_db, username: str, password: str):
+    user = get_user(fake_db, username)
+    if not user:
+        return False
+    if not verify_password(password, user.password):
+        return False
+    return user
+
+def create_access_token(data: dict, expires_delta: timedelta | None = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        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
+        token_data = TokenData(username=username)
+    except JWTError:
+        raise credentials_exception
+    user = get_user(fake_users, username=token_data.username)
+    if user is None:
+        raise credentials_exception
+    return user
diff --git a/app/main.py b/app/main.py
index 5dfe2c7..a50b2c5 100644
--- a/app/main.py
+++ b/app/main.py
@@ -2,6 +2,7 @@ from fastapi import FastAPI
 
 from .routers import users
 
+
 app = FastAPI()
 
 app.include_router(users.router)
diff --git a/app/models/users.py b/app/models/users.py
index b3da0b6..e1b9b4d 100644
--- a/app/models/users.py
+++ b/app/models/users.py
@@ -1,12 +1,11 @@
 from pydantic import BaseModel
-from pydantic_mongo import AbstractRepository, ObjectIdField
 
 
-class Users(BaseModel):
-    id: ObjectIdField = None
+class User(BaseModel):
+    id: int
     username: str
+    password: str
+    permissions: list[str] = []
 
-
-class UsersRepository(AbstractRepository[Users]):
-    class Meta:
-        collection_name = users
\ No newline at end of file
+class UserInDB(User):
+    password: str
\ No newline at end of file
diff --git a/app/routers/events.py b/app/routers/events.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/routers/users.py b/app/routers/users.py
index e3352a8..2dabaa1 100644
--- a/app/routers/users.py
+++ b/app/routers/users.py
@@ -1,5 +1,15 @@
 from fastapi import APIRouter
 
+fake_users = [
+    # password foo
+    {'id': 1, 'username': 'admin', 'password': '$2b$12$N.i74Kle18n5Toxhas.rVOjZreVC2WM34fCidNDyhSNgxVlbKwX7i',
+     'permissions': ['items:read', 'items:write', 'users:read', 'users:write']
+    },
+    # password bar
+    {'id': 2, 'username': 'client', 'password': '$2b$12$KUgpw1m0LF/s9NS1ZB5rRO2cA5D13MqRm56ab7ik2ixftXW/aqEyq',
+     'permissions': ['items:read']}
+]
+
 router = APIRouter()
 
 @router.get("/users/", tags=["users"])