parse gbfs_api_url from provider registry (#69)

mds/providers.py

@@ -15,11 +15,15 @@ class Provider():
     """
     A simple model for an entry in the Provider registry.
     """
-    def __init__(self, provider_name, provider_id, url, mds_api_url, **kwargs):
-        self.provider_name = provider_name
+    def __init__(self, *args, **kwargs):
+        self.provider_name = kwargs.pop("provider_name", None)
+
+        provider_id = kwargs.pop("provider_id", None)
         self.provider_id = provider_id if isinstance(provider_id, UUID) else UUID(provider_id)
-        self.url = self._clean_url(url)
-        self.mds_api_url = self._clean_url(mds_api_url)
+
+        self.url = self._clean_url(kwargs.pop("url", None))
+        self.mds_api_url = self._clean_url(kwargs.pop("mds_api_url", None))
+        self.gbfs_api_url = self._clean_url(kwargs.pop("gbfs_api_url", None))
 
         for k,v in kwargs.items():
             setattr(self, k, v)
@@ -31,8 +35,11 @@ def _clean_url(self, url):
         """
         Helper to return a normalized URL
         """
-        url = url.lower().rstrip("/")
-        return url if url.startswith("https://") else f"https://{url}"
+        if url:
+            url = url.lower().rstrip("/")
+            return url if url.startswith("https://") else f"https://{url}"
+        else:
+            return None
 
     def configure(self, config, use_id=False):
         """