feat: connect backend with the frontend

backend/config.py

@@ -1,15 +1,20 @@
 from pydantic_settings import BaseSettings
-from typing import Literal
+from typing import Literal, List
 
 class Settings(BaseSettings):
     database_url: str
     environment: Literal["dev", "stage", "prod"]
     hashids_salt: str
     encoder_alphabet: str
+    allow_origins: str
 
     class Config:
         env_file = ".env"
         env_file_encoding = "utf-8"
 
+    def get_allow_origins(self) -> List[str]:
+        return [origin.strip() for origin in self.allow_origins.split(",")]
+    
+
 # Singleton instance of settings
 settings = Settings()

backend/main.py

@@ -1,4 +1,5 @@
 from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
 
 from backend.config import settings
 from backend.db import database, Base, engine
@@ -6,6 +7,14 @@ from backend.routes import shortener_router
 
 app = FastAPI()
 
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.get_allow_origins(),
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
 @app.on_event("startup")
 async def startup():
     await database.connect()