1 files changed, 43 insertions, 0 deletions
diff --git a/backend/src/esi/refresh_token.py b/backend/src/esi/refresh_token.py
new file mode 100644
index 0000000..0b3e4a3
--- /dev/null
+++ b/backend/src/esi/refresh_token.py
@@ -0,0 +1,43 @@
+import base64
+import datetime
+import os
+
+from .shared_flow import send_token_request
+
+def get_access_token_from_refresh_token(refresh_token: str) -> dict[str, any]:
+    """
+    Obtains a new access token using a refresh token.
+
+    This function uses the provided refresh token to request a new access token
+    from the authentication server. It updates the expiration time of the token.
+
+    Args:
+        refresh_token: The refresh token used to obtain a new access token.
+
+    Returns:
+        A dictionary containing the new access token data, including 'expires_at'.
+    """
+    client_id = os.getenv('CLIENT_ID')
+    secret_key = os.getenv('SECRET_KEY')
+
+    if not client_id or not secret_key:
+        raise EnvironmentError("CLIENT_ID and SECRET_KEY must be set in environment variables.")
+
+    user_pass = f"{client_id}:{secret_key}"
+    basic_auth = base64.urlsafe_b64encode(user_pass.encode('utf-8')).decode()
+    auth_header = f"Basic {basic_auth}"
+
+    form_values = {
+        "grant_type": "refresh_token",
+        "refresh_token": refresh_token,
+    }
+
+    headers = {"Authorization": auth_header}
+
+    response = send_token_request(form_values, add_headers=headers)
+    data = response.json()
+
+    current_timestamp = int(datetime.datetime.now().timestamp())
+    data["expires_at"] = current_timestamp + data.get("expires_in", 0)
+
+    return data