Added dropbox api support as service and cleaned up get single call

middleware/app_be/services/dropboxservice.py

@@ -0,0 +1,64 @@
+import requests
+from django.conf import settings
+import dropbox
+
+
+class DropboxService:
+
+    @staticmethod
+    def create_file(filename: str, file: bytes) -> bool:
+        """Create / save (or overwrite) an file on the dropbox storage.
+
+        :param filename: filename
+        :param file: bytes representation of the file
+        :return: Whether file was successfully uploaded
+        """
+        try:
+            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
+            dbx.files_upload(file, settings.DROPBOX_IMAGE_FOLDER + filename)
+        except:
+            return False
+        return True
+
+    @staticmethod
+    def read_file(filename: str) -> bytes:
+        """Read  file on the dropbox storage.
+
+        :param filename: filename
+        :return: bytes representation of the file or None on error
+        """
+        file_bytes: bytes
+        try:
+            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
+            f: requests.models.Response
+            metadata, f = dbx.files_download(settings.DROPBOX_IMAGE_FOLDER + filename)
+            file_bytes = f.content
+            if f is not None:
+                f.close()
+        except:
+            print("Error downloading file from dropbox")
+        return file_bytes
+
+    @staticmethod
+    def update_file(filename: str, file: bytes) -> bool:
+        """Update (currently: overwrite) an file on the dropbox storage.
+
+        :param filename: filename of the file
+        :param file: bytes representation of the file
+        :return: Whether file was successfully uploaded
+        """
+        return DropboxService.create_file(filename, file)
+
+    @staticmethod
+    def delete_file(filename: str) -> bool:
+        """Delete an file from the dropbox storage.
+
+        :param filename: filename of the file
+        :return: Whether file was successfully deleted
+        """
+        try:
+            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
+            dbx.files_delete_v2(settings.DROPBOX_IMAGE_FOLDER + filename)
+        except:
+            return False
+        return True

middleware/app_be/services/wrapperservice.py

@@ -0,0 +1,13 @@
+import base64
+
+
+class WrapperService:
+
+    @staticmethod
+    def wrap_file(file_bytes: bytes) -> str:
+        file_encoded_b64 = base64.b64encode(file_bytes)
+        return file_encoded_b64.decode('utf-8')
+
+    @staticmethod
+    def unwrap_file(file_str: str) -> bytes:
+        return base64.b64decode(file_str)