add env file support

.env.example

@@ -0,0 +1,2 @@
+JWT_SECRET=your_jwt_secret_key_here
+JWT_ALGORITHM=HS256

.gitignore

@@ -1,3 +1,4 @@
 __pycache__
 .venv
 database.db
+.env

database.py

@@ -1,11 +1,10 @@
 from models import User
 from passlib.context import CryptContext
+from settings import settings
 import sqlite3
 import jwt
 import datetime
 
-JWT_SECRET = "secret"
-
 connection = sqlite3.connect('database.db')
 connection.row_factory = sqlite3.Row
 cursor = connection.cursor()
@@ -46,4 +45,4 @@ def login(user: User) -> str:
           "exp": exp
      }
      
-     return jwt.encode(payload=payload, key=JWT_SECRET, algorithm="HS256")
+     return jwt.encode(payload=payload, key=settings.jwt_secret, algorithm=settings.jwt_algorithm)

requirements.txt

@@ -1,3 +1,4 @@
 fastapi[standard]==0.121.2
 passlib==1.7.4
 pyjwt==2.10.1
+pydantic-settings==2.12.0

settings.py

@@ -0,0 +1,9 @@
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file='.env', env_file_encoding='utf-8')
+
+    jwt_secret: str
+    jwt_algorithm: str
+
+settings = Settings()