added logging for user ip and email on log-in (#133)

Problem
Currently no audit trail for log ins

Solution
- added logging of email, date, and ip address when the user succeeds and fails log in

Ticket URL
https://mediform.atlassian.net/browse/MEDI-88

Documentation
NA

Tests Run
- make testapi
- tested that logs show in expected cases

app/api/routes/login.py

@@ -1,7 +1,8 @@
 from typing import Any
 
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Request
 from sqlalchemy.orm import Session
+from datetime import datetime
 
 from api.schemas.users import UserLogin, UserLoginResponse
 from api.models.user import get_user_by_email
@@ -12,31 +13,45 @@
 import yaml
 
 router = APIRouter()
+logger = logging.getLogger(__name__)
 
 @router.post("/login", status_code=200, response_model=UserLoginResponse, name="login")
-def login_user(user: UserLogin) -> Any:
+def login_user(user: UserLogin, request: Request) -> Any:
     """
     Login a user if they provide a matching email and password to one found in the database,
     otherwise return exceptions.
     """
+    client_host = request.client.host
     # Determine which database to use based on the user group
     if user.user_group and user.user_group in db_functions:
         db_generator = db_functions[user.user_group]()
         db = next(db_generator)
     else:
+        logger.info(
+            f"User '{user.email}' login attempt failed due to: invalid user group at {datetime.now()} from IP address {client_host}"
+        )
         raise HTTPException(status_code=400, detail="Invalid user group.")
 
     found_user = get_user_by_email(db, str(user.email))
     if found_user is None:
+        logger.info(
+            f"User '{user.email}' login attempt failed due to: no user found with those credentials at {datetime.now()} from IP address {client_host}"
+        )
         raise HTTPException(
             status_code=401, detail="Unable to retrieve a user with those credentials."
         )
 
     if not verify_password(found_user.hashed_password, user.password):
+        logger.info(
+            f"User '{user.email}' login attempt failed due to: mismatched user and password at {datetime.now()} from IP address {client_host}"
+        )
         raise HTTPException(
             status_code=401, detail="Username and password do not match."
         )
 
     token = generate_auth_token(data={"sub": found_user.email}, user_group=user.user_group)
+    logger.info(
+        f"User '{user.email}' has successfully logged in at {datetime.now()} from IP address {client_host}"
+    )
 
     return UserLoginResponse(access_token=token)