[feature] Receive notification when followed account posts (if desired) (#1680)

* start working on notifs for new posts

* tidy up a bit

* update swagger

* carry over show reblogs + notify from follow req

* test notify on status post

* update column slice

* dedupe update logic + add tests

* fix own boosts not being timelined

* avoid type check, passing unnecessary accounts

* remove unnecessary 'inReplyToID' check

* add a couple todo's for future db functions

1 files changed, 140 insertions, 0 deletions

diff --git a/internal/processing/account/follow_test.go b/internal/processing/account/follow_test.go
new file mode 100644
index 000000000..70a28eea2
--- /dev/null
+++ b/internal/processing/account/follow_test.go
@@ -0,0 +1,140 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package account_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/testrig"
+)
+
+type FollowTestSuite struct {
+	AccountStandardTestSuite
+}
+
+func (suite *FollowTestSuite) TestUpdateExistingFollowChangeBoth() {
+	ctx := context.Background()
+	requestingAccount := suite.testAccounts["local_account_1"]
+	targetAccount := suite.testAccounts["admin_account"]
+
+	// Change both Reblogs and Notify.
+	// Trace logs should show a query similar to this:
+	//	UPDATE "follows" AS "follow" SET "show_reblogs" = FALSE, "notify" = TRUE, "updated_at" = '2023-04-09 11:42:39.424705+00:00' WHERE ("follow"."id" = '01F8PY8RHWRQZV038T4E8T9YK8')
+	relationship, err := suite.accountProcessor.FollowCreate(ctx, requestingAccount, &apimodel.AccountFollowRequest{
+		ID:      targetAccount.ID,
+		Reblogs: testrig.FalseBool(),
+		Notify:  testrig.TrueBool(),
+	})
+
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	suite.False(relationship.ShowingReblogs)
+	suite.True(relationship.Notifying)
+}
+
+func (suite *FollowTestSuite) TestUpdateExistingFollowChangeNotifyIgnoreReblogs() {
+	ctx := context.Background()
+	requestingAccount := suite.testAccounts["local_account_1"]
+	targetAccount := suite.testAccounts["admin_account"]
+
+	// Change Notify, ignore Reblogs.
+	// Trace logs should show a query similar to this:
+	//	UPDATE "follows" AS "follow" SET "notify" = TRUE, "updated_at" = '2023-04-09 11:40:33.827858+00:00' WHERE ("follow"."id" = '01F8PY8RHWRQZV038T4E8T9YK8')
+	relationship, err := suite.accountProcessor.FollowCreate(ctx, requestingAccount, &apimodel.AccountFollowRequest{
+		ID:     targetAccount.ID,
+		Notify: testrig.TrueBool(),
+	})
+
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	suite.True(relationship.ShowingReblogs)
+	suite.True(relationship.Notifying)
+}
+
+func (suite *FollowTestSuite) TestUpdateExistingFollowChangeNotifySetReblogs() {
+	ctx := context.Background()
+	requestingAccount := suite.testAccounts["local_account_1"]
+	targetAccount := suite.testAccounts["admin_account"]
+
+	// Change Notify, set Reblogs to same value as before.
+	// Trace logs should show a query similar to this:
+	//	UPDATE "follows" AS "follow" SET "notify" = TRUE, "updated_at" = '2023-04-09 11:40:33.827858+00:00' WHERE ("follow"."id" = '01F8PY8RHWRQZV038T4E8T9YK8')
+	relationship, err := suite.accountProcessor.FollowCreate(ctx, requestingAccount, &apimodel.AccountFollowRequest{
+		ID:      targetAccount.ID,
+		Notify:  testrig.TrueBool(),
+		Reblogs: testrig.TrueBool(),
+	})
+
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	suite.True(relationship.ShowingReblogs)
+	suite.True(relationship.Notifying)
+}
+
+func (suite *FollowTestSuite) TestUpdateExistingFollowChangeNothing() {
+	ctx := context.Background()
+	requestingAccount := suite.testAccounts["local_account_1"]
+	targetAccount := suite.testAccounts["admin_account"]
+
+	// Set Notify and Reblogs to same values as before.
+	// Trace logs should show no update query.
+	relationship, err := suite.accountProcessor.FollowCreate(ctx, requestingAccount, &apimodel.AccountFollowRequest{
+		ID:      targetAccount.ID,
+		Notify:  testrig.FalseBool(),
+		Reblogs: testrig.TrueBool(),
+	})
+
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	suite.True(relationship.ShowingReblogs)
+	suite.False(relationship.Notifying)
+}
+
+func (suite *FollowTestSuite) TestUpdateExistingFollowSetNothing() {
+	ctx := context.Background()
+	requestingAccount := suite.testAccounts["local_account_1"]
+	targetAccount := suite.testAccounts["admin_account"]
+
+	// Don't set Notify or Reblogs.
+	// Trace logs should show no update query.
+	relationship, err := suite.accountProcessor.FollowCreate(ctx, requestingAccount, &apimodel.AccountFollowRequest{
+		ID: targetAccount.ID,
+	})
+
+	if err != nil {
+		suite.FailNow(err.Error())
+	}
+
+	suite.True(relationship.ShowingReblogs)
+	suite.False(relationship.Notifying)
+}
+
+func TestFollowTestS(t *testing.T) {
+	suite.Run(t, new(FollowTestSuite))
+}