moderation log: fix improperly migrated data

Some of the actions used to have a user map as a subject, which was then
changed to an array of user maps. However instead of migrating old data
there was just a hack to transform it every time, moreover this hack
didn't include all possible actions, which resulted in crashes. This
commit fixes the crashes by introducing a proper database migration for old data.

Closes #1606

2 files changed, 9 insertions, 76 deletions

diff --git a/lib/pleroma/moderation_log.ex b/lib/pleroma/moderation_log.ex
index c81477f48..e32895f70 100644
--- a/lib/pleroma/moderation_log.ex
+++ b/lib/pleroma/moderation_log.ex
@@ -392,24 +392,6 @@ defmodule Pleroma.ModerationLog do
         data: %{
           "actor" => %{"nickname" => actor_nickname},
           "action" => "activate",
-          "subject" => user
-        }
-      })
-      when is_map(user) do
-    get_log_entry_message(%ModerationLog{
-      data: %{
-        "actor" => %{"nickname" => actor_nickname},
-        "action" => "activate",
-        "subject" => [user]
-      }
-    })
-  end
-
-  @spec get_log_entry_message(ModerationLog) :: String.t()
-  def get_log_entry_message(%ModerationLog{
-        data: %{
-          "actor" => %{"nickname" => actor_nickname},
-          "action" => "activate",
           "subject" => users
         }
       }) do
@@ -421,24 +403,6 @@ defmodule Pleroma.ModerationLog do
         data: %{
           "actor" => %{"nickname" => actor_nickname},
           "action" => "deactivate",
-          "subject" => user
-        }
-      })
-      when is_map(user) do
-    get_log_entry_message(%ModerationLog{
-      data: %{
-        "actor" => %{"nickname" => actor_nickname},
-        "action" => "deactivate",
-        "subject" => [user]
-      }
-    })
-  end
-
-  @spec get_log_entry_message(ModerationLog) :: String.t()
-  def get_log_entry_message(%ModerationLog{
-        data: %{
-          "actor" => %{"nickname" => actor_nickname},
-          "action" => "deactivate",
           "subject" => users
         }
       }) do
@@ -478,26 +442,6 @@ defmodule Pleroma.ModerationLog do
         data: %{
           "actor" => %{"nickname" => actor_nickname},
           "action" => "grant",
-          "subject" => user,
-          "permission" => permission
-        }
-      })
-      when is_map(user) do
-    get_log_entry_message(%ModerationLog{
-      data: %{
-        "actor" => %{"nickname" => actor_nickname},
-        "action" => "grant",
-        "subject" => [user],
-        "permission" => permission
-      }
-    })
-  end
-
-  @spec get_log_entry_message(ModerationLog) :: String.t()
-  def get_log_entry_message(%ModerationLog{
-        data: %{
-          "actor" => %{"nickname" => actor_nickname},
-          "action" => "grant",
           "subject" => users,
           "permission" => permission
         }
@@ -510,26 +454,6 @@ defmodule Pleroma.ModerationLog do
         data: %{
           "actor" => %{"nickname" => actor_nickname},
           "action" => "revoke",
-          "subject" => user,
-          "permission" => permission
-        }
-      })
-      when is_map(user) do
-    get_log_entry_message(%ModerationLog{
-      data: %{
-        "actor" => %{"nickname" => actor_nickname},
-        "action" => "revoke",
-        "subject" => [user],
-        "permission" => permission
-      }
-    })
-  end
-
-  @spec get_log_entry_message(ModerationLog) :: String.t()
-  def get_log_entry_message(%ModerationLog{
-        data: %{
-          "actor" => %{"nickname" => actor_nickname},
-          "action" => "revoke",
           "subject" => users,
           "permission" => permission
         }
diff --git a/priv/repo/migrations/20200307103755_fix_moderation_log_subjects.exs b/priv/repo/migrations/20200307103755_fix_moderation_log_subjects.exs
new file mode 100644
index 000000000..d1c8539e1
--- /dev/null
+++ b/priv/repo/migrations/20200307103755_fix_moderation_log_subjects.exs
@@ -0,0 +1,9 @@
+defmodule Pleroma.Repo.Migrations.FixModerationLogSubjects do
+  use Ecto.Migration
+
+  def change do
+    execute(
+      "update moderation_log set data = safe_jsonb_set(data, '{subject}', safe_jsonb_set('[]'::jsonb, '{0}', data->'subject')) where jsonb_typeof(data->'subject') != 'array' and data->>'action' = ANY('{revoke,grant,activate,deactivate,delete}');"
+    )
+  end
+end