From: Dessalines <dessalines@users.noreply.github.com>
Date: Mon, 22 Nov 2021 18:57:03 +0000 (-0500)
Subject: Adding unique constraint for activity ap_id. Fixes #1878 (#1935)
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Adding unique constraint for activity ap_id. Fixes #1878 (#1935)

* Adding unique constraint for activity ap_id. Fixes #1878

* Removing is_activity_already_known
---

diff --git a/crates/apub/src/activities/community/announce.rs b/crates/apub/src/activities/community/announce.rs
index 2784039b..cc30a89f 100644
--- a/crates/apub/src/activities/community/announce.rs
+++ b/crates/apub/src/activities/community/announce.rs
@@ -1,7 +1,7 @@
 use crate::{
   activities::{generate_activity_id, send_lemmy_activity, verify_activity, verify_is_public},
   activity_lists::AnnouncableActivities,
-  http::{is_activity_already_known, ActivityCommonFields},
+  http::ActivityCommonFields,
   insert_activity,
   objects::community::ApubCommunity,
   protocol::activities::{community::announce::AnnounceActivity, CreateOrUpdateType},
@@ -109,9 +109,6 @@ impl ActivityHandler for AnnounceActivity {
         let object_value = serde_json::to_value(&self.object)?;
         let object_data: ActivityCommonFields = serde_json::from_value(object_value.to_owned())?;
 
-        if is_activity_already_known(context.pool(), &object_data.id).await? {
-          return Ok(());
-        }
         insert_activity(&object_data.id, object_value, false, true, context.pool()).await?;
       }
     }
diff --git a/crates/apub/src/http/mod.rs b/crates/apub/src/http/mod.rs
index 18e654d4..03eb9e5b 100644
--- a/crates/apub/src/http/mod.rs
+++ b/crates/apub/src/http/mod.rs
@@ -24,7 +24,7 @@ use lemmy_apub_lib::{
   traits::{ActivityHandler, ActorType},
   APUB_JSON_CONTENT_TYPE,
 };
-use lemmy_db_schema::{source::activity::Activity, DbPool};
+use lemmy_db_schema::source::activity::Activity;
 use lemmy_utils::{location_info, LemmyError};
 use lemmy_websocket::LemmyContext;
 use log::info;
@@ -97,10 +97,6 @@ where
     .await?;
   verify_signature(&request, &actor.public_key())?;
 
-  // Do nothing if we received the same activity before
-  if is_activity_already_known(context.pool(), &activity_data.id).await? {
-    return Ok(HttpResponse::Ok().finish());
-  }
   info!("Verifying activity {}", activity_data.id.to_string());
   activity
     .verify(&Data::new(context.clone()), request_counter)
@@ -178,21 +174,6 @@ pub(crate) async fn get_activity(
   }
 }
 
-pub(crate) async fn is_activity_already_known(
-  pool: &DbPool,
-  activity_id: &Url,
-) -> Result<bool, LemmyError> {
-  let activity_id = activity_id.to_owned().into();
-  let existing = blocking(pool, move |conn| {
-    Activity::read_from_apub_id(conn, &activity_id)
-  })
-  .await?;
-  match existing {
-    Ok(_) => Ok(true),
-    Err(_) => Ok(false),
-  }
-}
-
 fn assert_activity_not_local(id: &Url, hostname: &str) -> Result<(), LemmyError> {
   let activity_domain = id.domain().context(location_info!())?;
 
diff --git a/crates/db_schema/src/impls/activity.rs b/crates/db_schema/src/impls/activity.rs
index 5ec5d49d..d946d628 100644
--- a/crates/db_schema/src/impls/activity.rs
+++ b/crates/db_schema/src/impls/activity.rs
@@ -127,7 +127,7 @@ mod tests {
     let inserted_activity = Activity::create(&conn, &activity_form).unwrap();
 
     let expected_activity = Activity {
-      ap_id: Some(ap_id.clone()),
+      ap_id: ap_id.clone(),
       id: inserted_activity.id,
       data: test_json,
       local: true,
diff --git a/crates/db_schema/src/schema.rs b/crates/db_schema/src/schema.rs
index 6cd2e2af..034edbe9 100644
--- a/crates/db_schema/src/schema.rs
+++ b/crates/db_schema/src/schema.rs
@@ -5,7 +5,7 @@ table! {
         local -> Bool,
         published -> Timestamp,
         updated -> Nullable<Timestamp>,
-        ap_id -> Nullable<Text>,
+        ap_id -> Text,
         sensitive -> Nullable<Bool>,
     }
 }
diff --git a/crates/db_schema/src/source/activity.rs b/crates/db_schema/src/source/activity.rs
index c5ac833e..5bdeb1db 100644
--- a/crates/db_schema/src/source/activity.rs
+++ b/crates/db_schema/src/source/activity.rs
@@ -10,7 +10,7 @@ pub struct Activity {
   pub local: bool,
   pub published: chrono::NaiveDateTime,
   pub updated: Option<chrono::NaiveDateTime>,
-  pub ap_id: Option<DbUrl>,
+  pub ap_id: DbUrl,
   pub sensitive: Option<bool>,
 }
 
diff --git a/migrations/2021-11-22-135324_add_activity_ap_id_index/down.sql b/migrations/2021-11-22-135324_add_activity_ap_id_index/down.sql
new file mode 100644
index 00000000..d2d3ad9d
--- /dev/null
+++ b/migrations/2021-11-22-135324_add_activity_ap_id_index/down.sql
@@ -0,0 +1,5 @@
+alter table activity alter column ap_id drop not null;
+
+create unique index idx_activity_unique_apid on activity ((data ->> 'id'::text));
+
+drop index idx_activity_ap_id;
diff --git a/migrations/2021-11-22-135324_add_activity_ap_id_index/up.sql b/migrations/2021-11-22-135324_add_activity_ap_id_index/up.sql
new file mode 100644
index 00000000..fedd94f5
--- /dev/null
+++ b/migrations/2021-11-22-135324_add_activity_ap_id_index/up.sql
@@ -0,0 +1,22 @@
+
+-- Delete the empty ap_ids
+delete from activity where ap_id is null;
+
+-- Make it required
+alter table activity alter column ap_id set not null;
+
+-- Delete dupes, keeping the first one
+delete
+from activity
+where id not in (
+  select min(id)
+  from activity
+  group by ap_id
+);
+
+-- The index
+create unique index idx_activity_ap_id on activity(ap_id);
+
+-- Drop the old index
+drop index idx_activity_unique_apid;
+