Initial attempt at modularizing CSP integration

atst/domain/csp/__init__.py

@@ -0,0 +1,11 @@
+from .files import RackspaceFiles
+
+
+class MockCSP:
+
+    def __init__(self, file_provider):
+        self.files = file_provider
+
+
+def make_csp_provider(app):
+    app.csp = MockCSP(RackspaceFiles(app))

atst/domain/csp/files.py

@@ -0,0 +1,30 @@
+from atst.uploader import Uploader
+
+
+class Files:
+    def upload(self, fyle): # pragma: no cover
+        """Store the file object `fyle` in the CSP. This method returns the
+        object name that can be used to later look up the file."""
+        raise NotImplementedError()
+
+    def download(self, object_name): # pragma: no cover
+        """Retrieve the stored file represented by `object_name`. Returns a
+        file object.
+        """
+        raise NotImplementedError()
+
+
+class RackspaceFiles(Files):
+    def __init__(self, app):
+        self.uploader = Uploader(
+            provider=app.config.get("STORAGE_PROVIDER"),
+            container=app.config.get("STORAGE_CONTAINER"),
+            key=app.config.get("STORAGE_KEY"),
+            secret=app.config.get("STORAGE_SECRET"),
+        )
+
+    def upload(self, fyle):
+        return self.uploader.upload(fyle)
+
+    def download(self, object_name):
+        return self.uploader.download_stream(object_name)