Add utilities module to support basic auth

inboard/app/utilities.py

@@ -0,0 +1,21 @@
+import os
+from secrets import compare_digest
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBasic, HTTPBasicCredentials
+
+
+def basic_auth(credentials: HTTPBasicCredentials = Depends(HTTPBasic())) -> str:
+    correct_username = compare_digest(
+        credentials.username, str(os.getenv("BASIC_AUTH_USERNAME"))
+    )
+    correct_password = compare_digest(
+        credentials.password, str(os.getenv("BASIC_AUTH_PASSWORD"))
+    )
+    if not (correct_username and correct_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Basic"},
+        )
+    return credentials.username