[chore] Refactor account deleting/block logic, tidy up some other processing things (#1599)

* start refactoring account deletion

* update to use state.DB

* further messing about

* some more tidying up

* more tidying, cleaning, nice-making

* further adventures in refactoring and the woes of technical debt

* update fr accept/reject

* poking + prodding

* fix up deleting

* create fave uri

* don't log using requestingAccount.ID because it might be nil

* move getBookmarks function

* use exists query to check for status bookmark

* use deletenotifications func

* fiddle

* delete follow request notif

* split up some db functions

* Fix possible nil pointer panic

* fix more possible nil pointers

* fix license headers

* warn when follow missing (target) account

* return wrapped err when bookmark/fave models can't be retrieved

* simplify self account delete

* warn log likely race condition

* de-sillify status delete loop

* move error check due north

* warn when unfollowSideEffects has no target account

* warn when no boost account is found

* warn + dump follow when no account

* more warnings

* warn on fave account not set

* move for loop inside anonymous function

* fix funky logic

* don't remove mutual account items on block;
do make sure unfollow occurs in both directions!

1 files changed, 172 insertions, 0 deletions

diff --git a/internal/db/bundb/statusfave.go b/internal/db/bundb/statusfave.go
new file mode 100644
index 000000000..c42ab249f
--- /dev/null
+++ b/internal/db/bundb/statusfave.go
@@ -0,0 +1,172 @@
+// 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 bundb
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
+	"github.com/uptrace/bun"
+)
+
+type statusFaveDB struct {
+	conn  *DBConn
+	state *state.State
+}
+
+func (s *statusFaveDB) GetStatusFave(ctx context.Context, id string) (*gtsmodel.StatusFave, db.Error) {
+	fave := new(gtsmodel.StatusFave)
+
+	err := s.conn.
+		NewSelect().
+		Model(fave).
+		Where("? = ?", bun.Ident("status_fave.ID"), id).
+		Scan(ctx)
+	if err != nil {
+		return nil, s.conn.ProcessError(err)
+	}
+
+	fave.Account, err = s.state.DB.GetAccountByID(ctx, fave.AccountID)
+	if err != nil {
+		return nil, fmt.Errorf("error getting status fave account %q: %w", fave.AccountID, err)
+	}
+
+	fave.TargetAccount, err = s.state.DB.GetAccountByID(ctx, fave.TargetAccountID)
+	if err != nil {
+		return nil, fmt.Errorf("error getting status fave target account %q: %w", fave.TargetAccountID, err)
+	}
+
+	fave.Status, err = s.state.DB.GetStatusByID(ctx, fave.StatusID)
+	if err != nil {
+		return nil, fmt.Errorf("error getting status fave status %q: %w", fave.StatusID, err)
+	}
+
+	return fave, nil
+}
+
+func (s *statusFaveDB) GetStatusFaveByAccountID(ctx context.Context, accountID string, statusID string) (*gtsmodel.StatusFave, db.Error) {
+	var id string
+
+	err := s.conn.
+		NewSelect().
+		TableExpr("? AS ?", bun.Ident("status_faves"), bun.Ident("status_fave")).
+		Column("status_fave.id").
+		Where("? = ?", bun.Ident("status_fave.account_id"), accountID).
+		Where("? = ?", bun.Ident("status_fave.status_id"), statusID).
+		Scan(ctx, &id)
+	if err != nil {
+		return nil, s.conn.ProcessError(err)
+	}
+
+	return s.GetStatusFave(ctx, id)
+}
+
+func (s *statusFaveDB) GetStatusFaves(ctx context.Context, statusID string) ([]*gtsmodel.StatusFave, db.Error) {
+	ids := []string{}
+
+	if err := s.conn.
+		NewSelect().
+		TableExpr("? AS ?", bun.Ident("status_faves"), bun.Ident("status_fave")).
+		Column("status_fave.id").
+		Where("? = ?", bun.Ident("status_fave.status_id"), statusID).
+		Scan(ctx, &ids); err != nil {
+		return nil, s.conn.ProcessError(err)
+	}
+
+	faves := make([]*gtsmodel.StatusFave, 0, len(ids))
+	for _, id := range ids {
+		fave, err := s.GetStatusFave(ctx, id)
+		if err != nil {
+			log.Errorf(ctx, "error getting status fave %q: %v", id, err)
+			continue
+		}
+
+		faves = append(faves, fave)
+	}
+
+	return faves, nil
+}
+
+func (s *statusFaveDB) PutStatusFave(ctx context.Context, statusFave *gtsmodel.StatusFave) db.Error {
+	_, err := s.conn.
+		NewInsert().
+		Model(statusFave).
+		Exec(ctx)
+
+	return s.conn.ProcessError(err)
+}
+
+func (s *statusFaveDB) DeleteStatusFave(ctx context.Context, id string) db.Error {
+	_, err := s.conn.
+		NewDelete().
+		TableExpr("? AS ?", bun.Ident("status_faves"), bun.Ident("status_fave")).
+		Where("? = ?", bun.Ident("status_fave.id"), id).
+		Exec(ctx)
+
+	return s.conn.ProcessError(err)
+}
+
+func (s *statusFaveDB) DeleteStatusFaves(ctx context.Context, targetAccountID string, originAccountID string) db.Error {
+	if targetAccountID == "" && originAccountID == "" {
+		return errors.New("DeleteStatusFaves: one of targetAccountID or originAccountID must be set")
+	}
+
+	// TODO: Capture fave IDs in a RETURNING
+	// statement (when faves have a cache),
+	// + use the IDs to invalidate cache entries.
+
+	q := s.conn.
+		NewDelete().
+		TableExpr("? AS ?", bun.Ident("status_faves"), bun.Ident("status_fave"))
+
+	if targetAccountID != "" {
+		q = q.Where("? = ?", bun.Ident("status_fave.target_account_id"), targetAccountID)
+	}
+
+	if originAccountID != "" {
+		q = q.Where("? = ?", bun.Ident("status_fave.account_id"), originAccountID)
+	}
+
+	if _, err := q.Exec(ctx); err != nil {
+		return s.conn.ProcessError(err)
+	}
+
+	return nil
+}
+
+func (s *statusFaveDB) DeleteStatusFavesForStatus(ctx context.Context, statusID string) db.Error {
+	// TODO: Capture fave IDs in a RETURNING
+	// statement (when faves have a cache),
+	// + use the IDs to invalidate cache entries.
+
+	q := s.conn.
+		NewDelete().
+		TableExpr("? AS ?", bun.Ident("status_faves"), bun.Ident("status_fave")).
+		Where("? = ?", bun.Ident("status_fave.status_id"), statusID)
+
+	if _, err := q.Exec(ctx); err != nil {
+		return s.conn.ProcessError(err)
+	}
+
+	return nil
+}