When receiving an "Update" activity check permissions #893
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Right now we do not check any permissions when receiving an "Update" (=edit) activity.
That means at the moment any user can send an "Update" activity to any post and mbin would just apply that update, regardless of whether the user should be able to do so as long as the HTTP headers are valid.
This PR implements a permission like this: a user should be able to modify a post if: