Bugfix/task id bytes (#917)

* Ensuring we return a string object, not bytes

* encode woes

Author: kevgliss

src/dispatch/plugins/dispatch_slack/actions.py

@@ -31,8 +31,7 @@
 
 def base64_decode(input: str):
     """Returns a b64 decoded string."""
-    return base64.b64decode(input).decode("ascii")
-
+    return base64.b64decode(input.encode("ascii")).decode("ascii")
 
 async def handle_slack_action(*, db_session, client, request, background_tasks):
     """Handles slack action message."""

src/dispatch/plugins/dispatch_slack/commands.py

@@ -69,7 +69,7 @@
 
 def base64_encode(input: str):
     """Returns a b64 encoded string."""
-    return base64.b64encode(input).decode("ascii")
+    return base64.b64encode(input.encode("ascii")).decode("ascii")
 
 
 def check_command_restrictions(