[feature] Process `Reject` of interaction via fedi API, put rejected statuses in the "sin bin" 😈 (#3271)

* [feature] Process `Reject` of interaction via fedi API, put rejected statuses in the "sin bin"

* update test

* move nil check back to `rejectStatusIRI`

internal/cache/cache.go

@@ -93,6 +93,7 @@ func (c *Caches) Init() {
 	c.initPollVote()
 	c.initPollVoteIDs()
 	c.initReport()
+	c.initSinBinStatus()
 	c.initStatus()
 	c.initStatusBookmark()
 	c.initStatusBookmarkIDs()
@@ -170,6 +171,7 @@ func (c *Caches) Sweep(threshold float64) {
 	c.DB.PollVote.Trim(threshold)
 	c.DB.PollVoteIDs.Trim(threshold)
 	c.DB.Report.Trim(threshold)
+	c.DB.SinBinStatus.Trim(threshold)
 	c.DB.Status.Trim(threshold)
 	c.DB.StatusBookmark.Trim(threshold)
 	c.DB.StatusBookmarkIDs.Trim(threshold)

internal/cache/db.go

@@ -145,6 +145,9 @@ type DBCaches struct {
 	// Report provides access to the gtsmodel Report database cache.
 	Report StructCache[*gtsmodel.Report]
 
+	// SinBinStatus provides access to the gtsmodel SinBinStatus database cache.
+	SinBinStatus StructCache[*gtsmodel.SinBinStatus]
+
 	// Status provides access to the gtsmodel Status database cache.
 	Status StructCache[*gtsmodel.Status]
 
@@ -1170,6 +1173,32 @@ func (c *Caches) initReport() {
 	})
 }
 
+func (c *Caches) initSinBinStatus() {
+	// Calculate maximum cache size.
+	cap := calculateResultCacheMax(
+		sizeofSinBinStatus(), // model in-mem size.
+		config.GetCacheSinBinStatusMemRatio(),
+	)
+
+	log.Infof(nil, "cache size = %d", cap)
+
+	copyF := func(s1 *gtsmodel.SinBinStatus) *gtsmodel.SinBinStatus {
+		s2 := new(gtsmodel.SinBinStatus)
+		*s2 = *s1
+		return s2
+	}
+
+	c.DB.SinBinStatus.Init(structr.CacheConfig[*gtsmodel.SinBinStatus]{
+		Indices: []structr.IndexConfig{
+			{Fields: "ID"},
+			{Fields: "URI"},
+		},
+		MaxSize:   cap,
+		IgnoreErr: ignoreErrors,
+		Copy:      copyF,
+	})
+}
+
 func (c *Caches) initStatus() {
 	// Calculate maximum cache size.
 	cap := calculateResultCacheMax(

internal/cache/size.go

@@ -593,6 +593,29 @@ func sizeofReport() uintptr {
 	}))
 }
 
+func sizeofSinBinStatus() uintptr {
+	return uintptr(size.Of(&gtsmodel.SinBinStatus{
+		ID:                  exampleID,
+		CreatedAt:           exampleTime,
+		UpdatedAt:           exampleTime,
+		URI:                 exampleURI,
+		URL:                 exampleURI,
+		Domain:              exampleURI,
+		AccountURI:          exampleURI,
+		InReplyToURI:        exampleURI,
+		Content:             exampleText,
+		AttachmentLinks:     []string{exampleURI, exampleURI},
+		MentionTargetURIs:   []string{exampleURI},
+		EmojiLinks:          []string{exampleURI},
+		PollOptions:         []string{exampleTextSmall, exampleTextSmall, exampleTextSmall, exampleTextSmall},
+		ContentWarning:      exampleTextSmall,
+		Visibility:          gtsmodel.VisibilityPublic,
+		Sensitive:           util.Ptr(false),
+		Language:            "en",
+		ActivityStreamsType: ap.ObjectNote,
+	}))
+}
+
 func sizeofStatus() uintptr {
 	return uintptr(size.Of(&gtsmodel.Status{
 		ID:                       exampleID,

internal/config/config.go

@@ -230,6 +230,7 @@ type CacheConfiguration struct {
 	PollVoteMemRatio                  float64       `name:"poll-vote-mem-ratio"`
 	PollVoteIDsMemRatio               float64       `name:"poll-vote-ids-mem-ratio"`
 	ReportMemRatio                    float64       `name:"report-mem-ratio"`
+	SinBinStatusMemRatio              float64       `name:"sin-bin-status-mem-ratio"`
 	StatusMemRatio                    float64       `name:"status-mem-ratio"`
 	StatusBookmarkMemRatio            float64       `name:"status-bookmark-mem-ratio"`
 	StatusBookmarkIDsMemRatio         float64       `name:"status-bookmark-ids-mem-ratio"`

internal/config/defaults.go

@@ -193,6 +193,7 @@ var Defaults = Configuration{
 		PollVoteMemRatio:                  2,
 		PollVoteIDsMemRatio:               2,
 		ReportMemRatio:                    1,
+		SinBinStatusMemRatio:              0.5,
 		StatusMemRatio:                    5,
 		StatusBookmarkMemRatio:            0.5,
 		StatusBookmarkIDsMemRatio:         2,

internal/config/helpers.gen.go

@@ -3712,6 +3712,31 @@ func GetCacheReportMemRatio() float64 { return global.GetCacheReportMemRatio() }
 // SetCacheReportMemRatio safely sets the value for global configuration 'Cache.ReportMemRatio' field
 func SetCacheReportMemRatio(v float64) { global.SetCacheReportMemRatio(v) }
 
+// GetCacheSinBinStatusMemRatio safely fetches the Configuration value for state's 'Cache.SinBinStatusMemRatio' field
+func (st *ConfigState) GetCacheSinBinStatusMemRatio() (v float64) {
+	st.mutex.RLock()
+	v = st.config.Cache.SinBinStatusMemRatio
+	st.mutex.RUnlock()
+	return
+}
+
+// SetCacheSinBinStatusMemRatio safely sets the Configuration value for state's 'Cache.SinBinStatusMemRatio' field
+func (st *ConfigState) SetCacheSinBinStatusMemRatio(v float64) {
+	st.mutex.Lock()
+	defer st.mutex.Unlock()
+	st.config.Cache.SinBinStatusMemRatio = v
+	st.reloadToViper()
+}
+
+// CacheSinBinStatusMemRatioFlag returns the flag name for the 'Cache.SinBinStatusMemRatio' field
+func CacheSinBinStatusMemRatioFlag() string { return "cache-sin-bin-status-mem-ratio" }
+
+// GetCacheSinBinStatusMemRatio safely fetches the value for global configuration 'Cache.SinBinStatusMemRatio' field
+func GetCacheSinBinStatusMemRatio() float64 { return global.GetCacheSinBinStatusMemRatio() }
+
+// SetCacheSinBinStatusMemRatio safely sets the value for global configuration 'Cache.SinBinStatusMemRatio' field
+func SetCacheSinBinStatusMemRatio(v float64) { global.SetCacheSinBinStatusMemRatio(v) }
+
 // GetCacheStatusMemRatio safely fetches the Configuration value for state's 'Cache.StatusMemRatio' field
 func (st *ConfigState) GetCacheStatusMemRatio() (v float64) {
 	st.mutex.RLock()

internal/db/bundb/bundb.go

@@ -76,6 +76,7 @@ type DBService struct {
 	db.Rule
 	db.Search
 	db.Session
+	db.SinBinStatus
 	db.Status
 	db.StatusBookmark
 	db.StatusFave
@@ -271,6 +272,10 @@ func NewBunDBService(ctx context.Context, state *state.State) (db.DB, error) {
 		Session: &sessionDB{
 			db: db,
 		},
+		SinBinStatus: &sinBinStatusDB{
+			db:    db,
+			state: state,
+		},
 		Status: &statusDB{
 			db:    db,
 			state: state,

internal/db/bundb/migrations/20240904084406_fedi_api_reject_interaction.go

@@ -0,0 +1,67 @@
+// 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 migrations
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/uptrace/bun"
+)
+
+func init() {
+	up := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+			if _, err := tx.
+				NewCreateTable().
+				Model(&gtsmodel.SinBinStatus{}).
+				IfNotExists().
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			for idx, col := range map[string]string{
+				"sin_bin_statuses_account_uri_idx":     "account_uri",
+				"sin_bin_statuses_domain_idx":          "domain",
+				"sin_bin_statuses_in_reply_to_uri_idx": "in_reply_to_uri",
+			} {
+				if _, err := tx.
+					NewCreateIndex().
+					Table("sin_bin_statuses").
+					Index(idx).
+					Column(col).
+					IfNotExists().
+					Exec(ctx); err != nil {
+					return err
+				}
+			}
+
+			return nil
+		})
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+			return nil
+		})
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}

internal/db/bundb/sinbinstatus.go

@@ -0,0 +1,122 @@
+// 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"
+	"time"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
+	"github.com/uptrace/bun"
+)
+
+type sinBinStatusDB struct {
+	db    *bun.DB
+	state *state.State
+}
+
+func (s *sinBinStatusDB) GetSinBinStatusByID(ctx context.Context, id string) (*gtsmodel.SinBinStatus, error) {
+	return s.getSinBinStatus(
+		"ID",
+		func(sbStatus *gtsmodel.SinBinStatus) error {
+			return s.db.
+				NewSelect().
+				Model(sbStatus).
+				Where("? = ?", bun.Ident("sin_bin_status.id"), id).
+				Scan(ctx)
+		},
+		id,
+	)
+}
+
+func (s *sinBinStatusDB) GetSinBinStatusByURI(ctx context.Context, uri string) (*gtsmodel.SinBinStatus, error) {
+	return s.getSinBinStatus(
+		"URI",
+		func(sbStatus *gtsmodel.SinBinStatus) error {
+			return s.db.
+				NewSelect().
+				Model(sbStatus).
+				Where("? = ?", bun.Ident("sin_bin_status.uri"), uri).
+				Scan(ctx)
+		},
+		uri,
+	)
+}
+
+func (s *sinBinStatusDB) getSinBinStatus(
+	lookup string,
+	dbQuery func(*gtsmodel.SinBinStatus) error,
+	keyParts ...any,
+) (*gtsmodel.SinBinStatus, error) {
+	// Fetch from database cache with loader callback.
+	return s.state.Caches.DB.SinBinStatus.LoadOne(lookup, func() (*gtsmodel.SinBinStatus, error) {
+		// Not cached! Perform database query.
+		sbStatus := new(gtsmodel.SinBinStatus)
+		if err := dbQuery(sbStatus); err != nil {
+			return nil, err
+		}
+
+		return sbStatus, nil
+	}, keyParts...)
+}
+
+func (s *sinBinStatusDB) PutSinBinStatus(ctx context.Context, sbStatus *gtsmodel.SinBinStatus) error {
+	return s.state.Caches.DB.SinBinStatus.Store(sbStatus, func() error {
+		_, err := s.db.
+			NewInsert().
+			Model(sbStatus).
+			Exec(ctx)
+		return err
+	})
+}
+
+func (s *sinBinStatusDB) UpdateSinBinStatus(
+	ctx context.Context,
+	sbStatus *gtsmodel.SinBinStatus,
+	columns ...string,
+) error {
+	sbStatus.UpdatedAt = time.Now()
+	if len(columns) > 0 {
+		// If we're updating by column,
+		// ensure "updated_at" is included.
+		columns = append(columns, "updated_at")
+	}
+
+	return s.state.Caches.DB.SinBinStatus.Store(sbStatus, func() error {
+		_, err := s.db.
+			NewUpdate().
+			Model(sbStatus).
+			Column(columns...).
+			Where("? = ?", bun.Ident("sin_bin_status.id"), sbStatus.ID).
+			Exec(ctx)
+		return err
+	})
+}
+
+func (s *sinBinStatusDB) DeleteSinBinStatusByID(ctx context.Context, id string) error {
+	// On return ensure status invalidated from cache.
+	defer s.state.Caches.DB.SinBinStatus.Invalidate("ID", id)
+
+	_, err := s.db.
+		NewDelete().
+		TableExpr("? AS ?", bun.Ident("sin_bin_statuses"), bun.Ident("sin_bin_status")).
+		Where("? = ?", bun.Ident("sin_bin_status.id"), id).
+		Exec(ctx)
+	return err
+}

internal/db/db.go

@@ -48,6 +48,7 @@ type DB interface {
 	Rule
 	Search
 	Session
+	SinBinStatus
 	Status
 	StatusBookmark
 	StatusFave

internal/db/sinbinstatus.go

@@ -0,0 +1,41 @@
+// 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 db
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+type SinBinStatus interface {
+	// GetSinBinStatusByID fetches the sin bin status from the database with matching id column.
+	GetSinBinStatusByID(ctx context.Context, id string) (*gtsmodel.SinBinStatus, error)
+
+	// GetSinBinStatusByURI fetches the sin bin status from the database with matching uri column.
+	GetSinBinStatusByURI(ctx context.Context, uri string) (*gtsmodel.SinBinStatus, error)
+
+	// PutSinBinStatus stores one sin bin status in the database.
+	PutSinBinStatus(ctx context.Context, sbStatus *gtsmodel.SinBinStatus) error
+
+	// UpdateSinBinStatus updates one sin bin status in the database.
+	UpdateSinBinStatus(ctx context.Context, sbStatus *gtsmodel.SinBinStatus, columns ...string) error
+
+	// DeleteSinBinStatusByID deletes one sin bin status from the database.
+	DeleteSinBinStatusByID(ctx context.Context, id string) error
+}

internal/federation/federatingdb/reject.go

@@ -20,12 +20,17 @@ package federatingdb
 import (
 	"context"
 	"errors"
-	"fmt"
+	"time"
 
 	"codeberg.org/gruf/go-logger/v2/level"
 	"github.com/superseriousbusiness/activity/streams/vocab"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/id"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
 	"github.com/superseriousbusiness/gotosocial/internal/uris"
 )
 
@@ -48,63 +53,450 @@ func (f *federatingDB) Reject(ctx context.Context, reject vocab.ActivityStreamsR
 	requestingAcct := activityContext.requestingAcct
 	receivingAcct := activityContext.receivingAcct
 
-	for _, obj := range ap.ExtractObjects(reject) {
+	activityID := ap.GetJSONLDId(reject)
+	if activityID == nil {
+		// We need an ID.
+		const text = "Reject had no id property"
+		return gtserror.NewErrorBadRequest(errors.New(text), text)
+	}
 
-		if obj.IsIRI() {
-			// we have just the URI of whatever is being rejected, so we need to find out what it is
-			rejectedObjectIRI := obj.GetIRI()
-			if uris.IsFollowPath(rejectedObjectIRI) {
-				// REJECT FOLLOW
-				followReq, err := f.state.DB.GetFollowRequestByURI(ctx, rejectedObjectIRI.String())
-				if err != nil {
-					return fmt.Errorf("Reject: couldn't get follow request with id %s from the database: %s", rejectedObjectIRI.String(), err)
-				}
+	for _, object := range ap.ExtractObjects(reject) {
+		if asType := object.GetType(); asType != nil {
+			// Check and handle any
+			// vocab.Type objects.
+			// nolint:gocritic
+			switch asType.GetTypeName() {
 
-				// Make sure the creator of the original follow
-				// is the same as whatever inbox this landed in.
-				if followReq.AccountID != receivingAcct.ID {
-					return errors.New("Reject: follow account and inbox account were not the same")
-				}
-
-				// Make sure the target of the original follow
-				// is the same as the account making the request.
-				if followReq.TargetAccountID != requestingAcct.ID {
-					return errors.New("Reject: follow target account and requesting account were not the same")
-				}
-
-				return f.state.DB.RejectFollowRequest(ctx, followReq.AccountID, followReq.TargetAccountID)
-			}
-		}
-
-		if t := obj.GetType(); t != nil {
-			// we have the whole object so we can figure out what we're rejecting
 			// REJECT FOLLOW
-			asFollow, ok := t.(vocab.ActivityStreamsFollow)
-			if !ok {
-				return errors.New("Reject: couldn't parse follow into vocab.ActivityStreamsFollow")
+			case ap.ActivityFollow:
+				if err := f.rejectFollowType(
+					ctx,
+					asType,
+					receivingAcct,
+					requestingAcct,
+				); err != nil {
+					return err
+				}
 			}
 
-			// convert the follow to something we can understand
-			gtsFollow, err := f.converter.ASFollowToFollow(ctx, asFollow)
-			if err != nil {
-				return fmt.Errorf("Reject: error converting asfollow to gtsfollow: %s", err)
-			}
+		} else if object.IsIRI() {
+			// Check and handle any
+			// IRI type objects.
+			switch objIRI := object.GetIRI(); {
 
-			// Make sure the creator of the original follow
-			// is the same as whatever inbox this landed in.
-			if gtsFollow.AccountID != receivingAcct.ID {
-				return errors.New("Reject: follow account and inbox account were not the same")
-			}
+			// REJECT FOLLOW
+			case uris.IsFollowPath(objIRI):
+				if err := f.rejectFollowIRI(
+					ctx,
+					objIRI.String(),
+					receivingAcct,
+					requestingAcct,
+				); err != nil {
+					return err
+				}
 
-			// Make sure the target of the original follow
-			// is the same as the account making the request.
-			if gtsFollow.TargetAccountID != requestingAcct.ID {
-				return errors.New("Reject: follow target account and requesting account were not the same")
-			}
+			// REJECT STATUS (reply/boost)
+			case uris.IsStatusesPath(objIRI):
+				if err := f.rejectStatusIRI(
+					ctx,
+					activityID.String(),
+					objIRI.String(),
+					receivingAcct,
+					requestingAcct,
+				); err != nil {
+					return err
+				}
 
-			return f.state.DB.RejectFollowRequest(ctx, gtsFollow.AccountID, gtsFollow.TargetAccountID)
+			// REJECT LIKE
+			case uris.IsLikePath(objIRI):
+				if err := f.rejectLikeIRI(
+					ctx,
+					activityID.String(),
+					objIRI.String(),
+					receivingAcct,
+					requestingAcct,
+				); err != nil {
+					return err
+				}
+			}
 		}
 	}
 
 	return nil
 }
+
+func (f *federatingDB) rejectFollowType(
+	ctx context.Context,
+	asType vocab.Type,
+	receivingAcct *gtsmodel.Account,
+	requestingAcct *gtsmodel.Account,
+) error {
+	// Cast the vocab.Type object to known AS type.
+	asFollow := asType.(vocab.ActivityStreamsFollow)
+
+	// Reconstruct the follow.
+	follow, err := f.converter.ASFollowToFollow(ctx, asFollow)
+	if err != nil {
+		err := gtserror.Newf("error converting Follow to *gtsmodel.Follow: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	// Lock on the Follow URI
+	// as we may be updating it.
+	unlock := f.state.FedLocks.Lock(follow.URI)
+	defer unlock()
+
+	// Make sure the creator of the original follow
+	// is the same as whatever inbox this landed in.
+	if follow.AccountID != receivingAcct.ID {
+		const text = "Follow account and inbox account were not the same"
+		return gtserror.NewErrorUnprocessableEntity(errors.New(text), text)
+	}
+
+	// Make sure the target of the original follow
+	// is the same as the account making the request.
+	if follow.TargetAccountID != requestingAcct.ID {
+		const text = "Follow target account and requesting account were not the same"
+		return gtserror.NewErrorForbidden(errors.New(text), text)
+	}
+
+	// Reject the follow.
+	err = f.state.DB.RejectFollowRequest(
+		ctx,
+		follow.AccountID,
+		follow.TargetAccountID,
+	)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error rejecting follow request: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	return nil
+}
+
+func (f *federatingDB) rejectFollowIRI(
+	ctx context.Context,
+	objectIRI string,
+	receivingAcct *gtsmodel.Account,
+	requestingAcct *gtsmodel.Account,
+) error {
+	// Lock on this potential Follow
+	// URI as we may be updating it.
+	unlock := f.state.FedLocks.Lock(objectIRI)
+	defer unlock()
+
+	// Get the follow req from the db.
+	followReq, err := f.state.DB.GetFollowRequestByURI(ctx, objectIRI)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error getting follow request: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	if followReq == nil {
+		// We didn't have a follow request
+		// with this URI, so nothing to do.
+		// Just return.
+		//
+		// TODO: Handle Reject Follow to remove
+		// an already-accepted follow relationship.
+		return nil
+	}
+
+	// Make sure the creator of the original follow
+	// is the same as whatever inbox this landed in.
+	if followReq.AccountID != receivingAcct.ID {
+		const text = "Follow account and inbox account were not the same"
+		return gtserror.NewErrorUnprocessableEntity(errors.New(text), text)
+	}
+
+	// Make sure the target of the original follow
+	// is the same as the account making the request.
+	if followReq.TargetAccountID != requestingAcct.ID {
+		const text = "Follow target account and requesting account were not the same"
+		return gtserror.NewErrorForbidden(errors.New(text), text)
+	}
+
+	// Reject the follow.
+	err = f.state.DB.RejectFollowRequest(
+		ctx,
+		followReq.AccountID,
+		followReq.TargetAccountID,
+	)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error rejecting follow request: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	return nil
+}
+
+func (f *federatingDB) rejectStatusIRI(
+	ctx context.Context,
+	activityID string,
+	objectIRI string,
+	receivingAcct *gtsmodel.Account,
+	requestingAcct *gtsmodel.Account,
+) error {
+	// Lock on this potential status URI.
+	unlock := f.state.FedLocks.Lock(objectIRI)
+	defer unlock()
+
+	// Get the status from the db.
+	status, err := f.state.DB.GetStatusByURI(ctx, objectIRI)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error getting status: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	if status == nil {
+		// We didn't have a status with
+		// this URI, so nothing to do.
+		// Just return.
+		return nil
+	}
+
+	if !status.IsLocal() {
+		// We don't process Rejects of statuses
+		// that weren't created on our instance.
+		// Just return.
+		//
+		// TODO: Handle Reject to remove *remote*
+		// posts replying-to or boosting the
+		// Rejecting account.
+		return nil
+	}
+
+	// Make sure the creator of the original status
+	// is the same as the inbox processing the Reject;
+	// this also ensures the status is local.
+	if status.AccountID != receivingAcct.ID {
+		const text = "status author account and inbox account were not the same"
+		return gtserror.NewErrorUnprocessableEntity(errors.New(text), text)
+	}
+
+	// Check if we're dealing with a reply
+	// or an announce, and make sure the
+	// requester is permitted to Reject.
+	var apObjectType string
+	if status.InReplyToID != "" {
+		// Rejecting a Reply.
+		apObjectType = ap.ObjectNote
+		if status.InReplyToAccountID != requestingAcct.ID {
+			const text = "status reply to account and requesting account were not the same"
+			return gtserror.NewErrorForbidden(errors.New(text), text)
+		}
+
+		// You can't mention an account and then Reject replies from that
+		// same account (harassment vector); don't process these Rejects.
+		if status.InReplyTo != nil && status.InReplyTo.MentionsAccount(status.AccountID) {
+			const text = "refusing to process Reject of a reply from a mentioned account"
+			return gtserror.NewErrorForbidden(errors.New(text), text)
+		}
+
+	} else {
+		// Rejecting an Announce.
+		apObjectType = ap.ActivityAnnounce
+		if status.BoostOfAccountID != requestingAcct.ID {
+			const text = "status boost of account and requesting account were not the same"
+			return gtserror.NewErrorForbidden(errors.New(text), text)
+		}
+	}
+
+	// Check if there's an interaction request in the db for this status.
+	req, err := f.state.DB.GetInteractionRequestByInteractionURI(ctx, status.URI)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error getting interaction request: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	switch {
+	case req == nil:
+		// No interaction request existed yet for this
+		// status, create a pre-rejected request now.
+		req = &gtsmodel.InteractionRequest{
+			ID:                   id.NewULID(),
+			TargetAccountID:      requestingAcct.ID,
+			TargetAccount:        requestingAcct,
+			InteractingAccountID: receivingAcct.ID,
+			InteractingAccount:   receivingAcct,
+			InteractionURI:       status.URI,
+			URI:                  activityID,
+			RejectedAt:           time.Now(),
+		}
+
+		if apObjectType == ap.ObjectNote {
+			// Reply.
+			req.InteractionType = gtsmodel.InteractionReply
+			req.StatusID = status.InReplyToID
+			req.Status = status.InReplyTo
+			req.Reply = status
+		} else {
+			// Announce.
+			req.InteractionType = gtsmodel.InteractionAnnounce
+			req.StatusID = status.BoostOfID
+			req.Status = status.BoostOf
+			req.Announce = status
+		}
+
+		if err := f.state.DB.PutInteractionRequest(ctx, req); err != nil {
+			err := gtserror.Newf("db error inserting interaction request: %w", err)
+			return gtserror.NewErrorInternalError(err)
+		}
+
+	case req.IsRejected():
+		// Interaction has already been rejected. Just
+		// update to this Reject URI and then return early.
+		req.URI = activityID
+		if err := f.state.DB.UpdateInteractionRequest(ctx, req, "uri"); err != nil {
+			err := gtserror.Newf("db error updating interaction request: %w", err)
+			return gtserror.NewErrorInternalError(err)
+		}
+		return nil
+
+	default:
+		// Mark existing interaction request as
+		// Rejected, even if previously Accepted.
+		req.AcceptedAt = time.Time{}
+		req.RejectedAt = time.Now()
+		req.URI = activityID
+		if err := f.state.DB.UpdateInteractionRequest(ctx, req,
+			"accepted_at",
+			"rejected_at",
+			"uri",
+		); err != nil {
+			err := gtserror.Newf("db error updating interaction request: %w", err)
+			return gtserror.NewErrorInternalError(err)
+		}
+	}
+
+	// Send the rejected request through to
+	// the fedi worker to process side effects.
+	f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
+		APObjectType:   apObjectType,
+		APActivityType: ap.ActivityReject,
+		GTSModel:       req,
+		Receiving:      receivingAcct,
+		Requesting:     requestingAcct,
+	})
+
+	return nil
+}
+
+func (f *federatingDB) rejectLikeIRI(
+	ctx context.Context,
+	activityID string,
+	objectIRI string,
+	receivingAcct *gtsmodel.Account,
+	requestingAcct *gtsmodel.Account,
+) error {
+	// Lock on this potential Like
+	// URI as we may be updating it.
+	unlock := f.state.FedLocks.Lock(objectIRI)
+	defer unlock()
+
+	// Get the fave from the db.
+	fave, err := f.state.DB.GetStatusFaveByURI(ctx, objectIRI)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error getting fave: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	if fave == nil {
+		// We didn't have a fave with
+		// this URI, so nothing to do.
+		// Just return.
+		return nil
+	}
+
+	if !fave.Account.IsLocal() {
+		// We don't process Rejects of Likes
+		// that weren't created on our instance.
+		// Just return.
+		//
+		// TODO: Handle Reject to remove *remote*
+		// likes targeting the Rejecting account.
+		return nil
+	}
+
+	// Make sure the creator of the original Like
+	// is the same as the inbox processing the Reject;
+	// this also ensures the Like is local.
+	if fave.AccountID != receivingAcct.ID {
+		const text = "fave creator account and inbox account were not the same"
+		return gtserror.NewErrorUnprocessableEntity(errors.New(text), text)
+	}
+
+	// Make sure the target of the Like is the
+	// same as the account doing the Reject.
+	if fave.TargetAccountID != requestingAcct.ID {
+		const text = "status fave target account and requesting account were not the same"
+		return gtserror.NewErrorForbidden(errors.New(text), text)
+	}
+
+	// Check if there's an interaction request in the db for this like.
+	req, err := f.state.DB.GetInteractionRequestByInteractionURI(ctx, fave.URI)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err := gtserror.Newf("db error getting interaction request: %w", err)
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	switch {
+	case req == nil:
+		// No interaction request existed yet for this
+		// fave, create a pre-rejected request now.
+		req = &gtsmodel.InteractionRequest{
+			ID:                   id.NewULID(),
+			TargetAccountID:      requestingAcct.ID,
+			TargetAccount:        requestingAcct,
+			InteractingAccountID: receivingAcct.ID,
+			InteractingAccount:   receivingAcct,
+			InteractionURI:       fave.URI,
+			InteractionType:      gtsmodel.InteractionLike,
+			Like:                 fave,
+			URI:                  activityID,
+			RejectedAt:           time.Now(),
+		}
+
+		if err := f.state.DB.PutInteractionRequest(ctx, req); err != nil {
+			err := gtserror.Newf("db error inserting interaction request: %w", err)
+			return gtserror.NewErrorInternalError(err)
+		}
+
+	case req.IsRejected():
+		// Interaction has already been rejected. Just
+		// update to this Reject URI and then return early.
+		req.URI = activityID
+		if err := f.state.DB.UpdateInteractionRequest(ctx, req, "uri"); err != nil {
+			err := gtserror.Newf("db error updating interaction request: %w", err)
+			return gtserror.NewErrorInternalError(err)
+		}
+		return nil
+
+	default:
+		// Mark existing interaction request as
+		// Rejected, even if previously Accepted.
+		req.AcceptedAt = time.Time{}
+		req.RejectedAt = time.Now()
+		req.URI = activityID
+		if err := f.state.DB.UpdateInteractionRequest(ctx, req,
+			"accepted_at",
+			"rejected_at",
+			"uri",
+		); err != nil {
+			err := gtserror.Newf("db error updating interaction request: %w", err)
+			return gtserror.NewErrorInternalError(err)
+		}
+	}
+
+	// Send the rejected request through to
+	// the fedi worker to process side effects.
+	f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
+		APObjectType:   ap.ActivityLike,
+		APActivityType: ap.ActivityReject,
+		GTSModel:       req,
+		Receiving:      receivingAcct,
+		Requesting:     requestingAcct,
+	})
+
+	return nil
+}

internal/federation/federatingdb/reject_test.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/stretchr/testify/suite"
 	"github.com/superseriousbusiness/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/uris"
@@ -61,10 +62,11 @@ func (suite *RejectTestSuite) TestRejectFollowRequest() {
 	// create a Reject
 	reject := streams.NewActivityStreamsReject()
 
+	// set an ID on it
+	ap.SetJSONLDId(reject, testrig.URLMustParse("https://example.org/some/reject/id"))
+
 	// set the rejecting actor on it
-	acceptActorProp := streams.NewActivityStreamsActorProperty()
-	acceptActorProp.AppendIRI(rejectingAccountURI)
-	reject.SetActivityStreamsActor(acceptActorProp)
+	ap.AppendActorIRIs(reject, rejectingAccountURI)
 
 	// Set the recreated follow as the 'object' property.
 	acceptObject := streams.NewActivityStreamsObjectProperty()
@@ -72,9 +74,7 @@ func (suite *RejectTestSuite) TestRejectFollowRequest() {
 	reject.SetActivityStreamsObject(acceptObject)
 
 	// Set the To of the reject as the originator of the follow
-	acceptTo := streams.NewActivityStreamsToProperty()
-	acceptTo.AppendIRI(requestingAccountURI)
-	reject.SetActivityStreamsTo(acceptTo)
+	ap.AppendTo(reject, requestingAccountURI)
 
 	// process the reject in the federating database
 	err = suite.federatingDB.Reject(ctx, reject)

internal/gtsmodel/sinbinstatus.go

@@ -0,0 +1,45 @@
+// 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 gtsmodel
+
+import "time"
+
+// SinBinStatus represents a status that's been rejected and/or reported + quarantined.
+//
+// Automatically rejected statuses are not put in the sin bin, only statuses that were
+// stored on the instance and which someone (local or remote) has subsequently rejected.
+type SinBinStatus struct {
+	ID                  string     `bun:"type:CHAR(26),pk,nullzero,notnull,unique"`                    // ID of this item in the database.
+	CreatedAt           time.Time  `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // Creation time of this item.
+	UpdatedAt           time.Time  `bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // Last-updated time of this item.
+	URI                 string     `bun:",unique,nullzero,notnull"`                                    // ActivityPub URI/ID of this status.
+	URL                 string     `bun:",nullzero"`                                                   // Web url for viewing this status.
+	Domain              string     `bun:",nullzero"`                                                   // Domain of the status, will be null if this is a local status, otherwise something like `example.org`.
+	AccountURI          string     `bun:",nullzero,notnull"`                                           // ActivityPub uri of the author of this status.
+	InReplyToURI        string     `bun:",nullzero"`                                                   // ActivityPub uri of the status this status is a reply to.
+	Content             string     `bun:",nullzero"`                                                   // Content of this status.
+	AttachmentLinks     []string   `bun:",nullzero,array"`                                             // Links to attachments of this status.
+	MentionTargetURIs   []string   `bun:",nullzero,array"`                                             // URIs of mentioned accounts.
+	EmojiLinks          []string   `bun:",nullzero,array"`                                             // Links to any emoji images used in this status.
+	PollOptions         []string   `bun:",nullzero,array"`                                             // String values of any poll options used in this status.
+	ContentWarning      string     `bun:",nullzero"`                                                   // CW / subject string for this status.
+	Visibility          Visibility `bun:",nullzero,notnull"`                                           // Visibility level of this status.
+	Sensitive           *bool      `bun:",nullzero,notnull,default:false"`                             // Mark the status as sensitive.
+	Language            string     `bun:",nullzero"`                                                   // Language code for this status.
+	ActivityStreamsType string     `bun:",nullzero,notnull"`                                           // ActivityStreams type of this status.
+}

internal/processing/interactionrequests/reject_test.go

@@ -71,6 +71,16 @@ func (suite *RejectTestSuite) TestReject() {
 		)
 		return status == nil && errors.Is(err, db.ErrNoEntries)
 	})
+
+	// Wait for a copy of the status
+	// to be hurled into the sin bin.
+	testrig.WaitFor(func() bool {
+		sbStatus, err := state.DB.GetSinBinStatusByURI(
+			gtscontext.SetBarebones(ctx),
+			dbReq.InteractionURI,
+		)
+		return err == nil && sbStatus != nil
+	})
 }
 
 func TestRejectTestSuite(t *testing.T) {

internal/processing/workers/fromclientapi.go

@@ -911,11 +911,6 @@ func (p *clientAPI) UndoAnnounce(ctx context.Context, cMsg *messages.FromClientA
 }
 
 func (p *clientAPI) DeleteStatus(ctx context.Context, cMsg *messages.FromClientAPI) error {
-	// Don't delete attachments, just unattach them:
-	// this request comes from the client API and the
-	// poster may want to use attachments again later.
-	const deleteAttachments = false
-
 	status, ok := cMsg.GTSModel.(*gtsmodel.Status)
 	if !ok {
 		return gtserror.Newf("%T not parseable as *gtsmodel.Status", cMsg.GTSModel)
@@ -942,8 +937,22 @@ func (p *clientAPI) DeleteStatus(ctx context.Context, cMsg *messages.FromClientA
 	// (stops processing of remote origin data targeting this status).
 	p.state.Workers.Federator.Queue.Delete("TargetURI", status.URI)
 
-	// First perform the actual status deletion.
-	if err := p.utils.wipeStatus(ctx, status, deleteAttachments); err != nil {
+	// Don't delete attachments, just unattach them:
+	// this request comes from the client API and the
+	// poster may want to use attachments again later.
+	const deleteAttachments = false
+
+	// This is just a deletion, not a Reject,
+	// we don't need to take a copy of this status.
+	const copyToSinBin = false
+
+	// Perform the actual status deletion.
+	if err := p.utils.wipeStatus(
+		ctx,
+		status,
+		deleteAttachments,
+		copyToSinBin,
+	); err != nil {
 		log.Errorf(ctx, "error wiping status: %v", err)
 	}
 
@@ -1275,9 +1284,23 @@ func (p *clientAPI) RejectReply(ctx context.Context, cMsg *messages.FromClientAP
 		return gtserror.Newf("db error getting rejected reply: %w", err)
 	}
 
-	// Totally wipe the status.
-	if err := p.utils.wipeStatus(ctx, status, true); err != nil {
-		return gtserror.Newf("error wiping status: %w", err)
+	// Delete attachments from this status.
+	// It's rejected so there's no possibility
+	// for the poster to delete + redraft it.
+	const deleteAttachments = true
+
+	// Keep a copy of the status in
+	// the sin bin for future review.
+	const copyToSinBin = true
+
+	// Perform the actual status deletion.
+	if err := p.utils.wipeStatus(
+		ctx,
+		status,
+		deleteAttachments,
+		copyToSinBin,
+	); err != nil {
+		log.Errorf(ctx, "error wiping reply: %v", err)
 	}
 
 	return nil
@@ -1306,9 +1329,22 @@ func (p *clientAPI) RejectAnnounce(ctx context.Context, cMsg *messages.FromClien
 		return gtserror.Newf("db error getting rejected announce: %w", err)
 	}
 
-	// Totally wipe the status.
-	if err := p.utils.wipeStatus(ctx, boost, true); err != nil {
-		return gtserror.Newf("error wiping status: %w", err)
+	// Boosts don't have attachments anyway
+	// so it doesn't matter what we set here.
+	const deleteAttachments = true
+
+	// This is just a boost, don't
+	// keep a copy in the sin bin.
+	const copyToSinBin = true
+
+	// Perform the actual status deletion.
+	if err := p.utils.wipeStatus(
+		ctx,
+		boost,
+		deleteAttachments,
+		copyToSinBin,
+	); err != nil {
+		log.Errorf(ctx, "error wiping announce: %v", err)
 	}
 
 	return nil

internal/processing/workers/fromfediapi.go

@@ -27,6 +27,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/federation/dereferencing"
+	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
 	"github.com/superseriousbusiness/gotosocial/internal/id"
 	"github.com/superseriousbusiness/gotosocial/internal/uris"
 
@@ -146,6 +147,23 @@ func (p *Processor) ProcessFromFediAPI(ctx context.Context, fMsg *messages.FromF
 			return p.fediAPI.AcceptAnnounce(ctx, fMsg)
 		}
 
+	// REJECT SOMETHING
+	case ap.ActivityReject:
+		switch fMsg.APObjectType {
+
+		// REJECT LIKE
+		case ap.ActivityLike:
+			return p.fediAPI.RejectLike(ctx, fMsg)
+
+		// REJECT NOTE/STATUS (ie., reject a reply)
+		case ap.ObjectNote:
+			return p.fediAPI.RejectReply(ctx, fMsg)
+
+		// REJECT BOOST
+		case ap.ActivityAnnounce:
+			return p.fediAPI.RejectAnnounce(ctx, fMsg)
+		}
+
 	// DELETE SOMETHING
 	case ap.ActivityDelete:
 		switch fMsg.APObjectType {
@@ -878,11 +896,6 @@ func (p *fediAPI) UpdateStatus(ctx context.Context, fMsg *messages.FromFediAPI)
 }
 
 func (p *fediAPI) DeleteStatus(ctx context.Context, fMsg *messages.FromFediAPI) error {
-	// Delete attachments from this status, since this request
-	// comes from the federating API, and there's no way the
-	// poster can do a delete + redraft for it on our instance.
-	const deleteAttachments = true
-
 	status, ok := fMsg.GTSModel.(*gtsmodel.Status)
 	if !ok {
 		return gtserror.Newf("%T not parseable as *gtsmodel.Status", fMsg.GTSModel)
@@ -909,8 +922,22 @@ func (p *fediAPI) DeleteStatus(ctx context.Context, fMsg *messages.FromFediAPI)
 	// (stops processing of remote origin data targeting this status).
 	p.state.Workers.Federator.Queue.Delete("TargetURI", status.URI)
 
-	// First perform the actual status deletion.
-	if err := p.utils.wipeStatus(ctx, status, deleteAttachments); err != nil {
+	// Delete attachments from this status, since this request
+	// comes from the federating API, and there's no way the
+	// poster can do a delete + redraft for it on our instance.
+	const deleteAttachments = true
+
+	// This is just a deletion, not a Reject,
+	// we don't need to take a copy of this status.
+	const copyToSinBin = false
+
+	// Perform the actual status deletion.
+	if err := p.utils.wipeStatus(
+		ctx,
+		status,
+		deleteAttachments,
+		copyToSinBin,
+	); err != nil {
 		log.Errorf(ctx, "error wiping status: %v", err)
 	}
 
@@ -956,3 +983,113 @@ func (p *fediAPI) DeleteAccount(ctx context.Context, fMsg *messages.FromFediAPI)
 
 	return nil
 }
+
+func (p *fediAPI) RejectLike(ctx context.Context, fMsg *messages.FromFediAPI) error {
+	req, ok := fMsg.GTSModel.(*gtsmodel.InteractionRequest)
+	if !ok {
+		return gtserror.Newf("%T not parseable as *gtsmodel.InteractionRequest", fMsg.GTSModel)
+	}
+
+	// At this point the InteractionRequest should already
+	// be in the database, we just need to do side effects.
+
+	// Send out the Reject.
+	if err := p.federate.RejectInteraction(ctx, req); err != nil {
+		log.Errorf(ctx, "error federating rejection of like: %v", err)
+	}
+
+	// Get the rejected fave.
+	fave, err := p.state.DB.GetStatusFaveByURI(
+		gtscontext.SetBarebones(ctx),
+		req.InteractionURI,
+	)
+	if err != nil {
+		return gtserror.Newf("db error getting rejected fave: %w", err)
+	}
+
+	// Delete the fave.
+	if err := p.state.DB.DeleteStatusFaveByID(ctx, fave.ID); err != nil {
+		return gtserror.Newf("db error deleting fave: %w", err)
+	}
+
+	return nil
+}
+
+func (p *fediAPI) RejectReply(ctx context.Context, fMsg *messages.FromFediAPI) error {
+	req, ok := fMsg.GTSModel.(*gtsmodel.InteractionRequest)
+	if !ok {
+		return gtserror.Newf("%T not parseable as *gtsmodel.InteractionRequest", fMsg.GTSModel)
+	}
+
+	// At this point the InteractionRequest should already
+	// be in the database, we just need to do side effects.
+
+	// Get the rejected status.
+	status, err := p.state.DB.GetStatusByURI(
+		gtscontext.SetBarebones(ctx),
+		req.InteractionURI,
+	)
+	if err != nil {
+		return gtserror.Newf("db error getting rejected reply: %w", err)
+	}
+
+	// Delete attachments from this status.
+	// It's rejected so there's no possibility
+	// for the poster to delete + redraft it.
+	const deleteAttachments = true
+
+	// Keep a copy of the status in
+	// the sin bin for future review.
+	const copyToSinBin = true
+
+	// Perform the actual status deletion.
+	if err := p.utils.wipeStatus(
+		ctx,
+		status,
+		deleteAttachments,
+		copyToSinBin,
+	); err != nil {
+		log.Errorf(ctx, "error wiping reply: %v", err)
+	}
+
+	return nil
+}
+
+func (p *fediAPI) RejectAnnounce(ctx context.Context, fMsg *messages.FromFediAPI) error {
+	req, ok := fMsg.GTSModel.(*gtsmodel.InteractionRequest)
+	if !ok {
+		return gtserror.Newf("%T not parseable as *gtsmodel.InteractionRequest", fMsg.GTSModel)
+	}
+
+	// At this point the InteractionRequest should already
+	// be in the database, we just need to do side effects.
+
+	// Get the rejected boost.
+	boost, err := p.state.DB.GetStatusByURI(
+		gtscontext.SetBarebones(ctx),
+		req.InteractionURI,
+	)
+	if err != nil {
+		return gtserror.Newf("db error getting rejected announce: %w", err)
+	}
+
+	// Boosts don't have attachments anyway
+	// so it doesn't matter what we set here.
+	const deleteAttachments = true
+
+	// This is just a boost, don't
+	// keep a copy in the sin bin.
+	const copyToSinBin = true
+
+	// Perform the actual status deletion.
+	if err := p.utils.wipeStatus(
+		ctx,
+		boost,
+		deleteAttachments,
+		copyToSinBin,
+	); err != nil {
+		log.Errorf(ctx, "error wiping announce: %v", err)
+	}
+
+	return nil
+}

internal/processing/workers/util.go

@@ -37,69 +37,90 @@ import (
 // util provides util functions used by both
 // the fromClientAPI and fromFediAPI functions.
 type utils struct {
-	state   *state.State
-	media   *media.Processor
-	account *account.Processor
-	surface *Surface
+	state     *state.State
+	media     *media.Processor
+	account   *account.Processor
+	surface   *Surface
+	converter *typeutils.Converter
 }
 
-// wipeStatus encapsulates common logic
-// used to totally delete a status + all
-// its attachments, notifications, boosts,
-// and timeline entries.
+// wipeStatus encapsulates common logic used to
+// totally delete a status + all its attachments,
+// notifications, boosts, and timeline entries.
+//
+// If deleteAttachments is true, then any status
+// attachments will also be deleted, else they
+// will just be detached.
+//
+// If copyToSinBin is true, then a version of the
+// status will be put in the `sin_bin_statuses`
+// table prior to deletion.
 func (u *utils) wipeStatus(
 	ctx context.Context,
-	statusToDelete *gtsmodel.Status,
+	status *gtsmodel.Status,
 	deleteAttachments bool,
+	copyToSinBin bool,
 ) error {
 	var errs gtserror.MultiError
 
+	if copyToSinBin {
+		// Copy this status to the sin bin before we delete it.
+		sbStatus, err := u.converter.StatusToSinBinStatus(ctx, status)
+		if err != nil {
+			errs.Appendf("error converting status to sinBinStatus: %w", err)
+		} else {
+			if err := u.state.DB.PutSinBinStatus(ctx, sbStatus); err != nil {
+				errs.Appendf("db error storing sinBinStatus: %w", err)
+			}
+		}
+	}
+
 	// Either delete all attachments for this status,
-	// or simply unattach + clean them separately later.
+	// or simply detach + clean them separately later.
 	//
-	// Reason to unattach rather than delete is that
-	// the poster might want to reattach them to another
-	// status immediately (in case of delete + redraft)
+	// Reason to detach rather than delete is that
+	// the author might want to reattach them to another
+	// status immediately (in case of delete + redraft).
 	if deleteAttachments {
 		// todo:u.state.DB.DeleteAttachmentsForStatus
-		for _, id := range statusToDelete.AttachmentIDs {
+		for _, id := range status.AttachmentIDs {
 			if err := u.media.Delete(ctx, id); err != nil {
 				errs.Appendf("error deleting media: %w", err)
 			}
 		}
 	} else {
 		// todo:u.state.DB.UnattachAttachmentsForStatus
-		for _, id := range statusToDelete.AttachmentIDs {
-			if _, err := u.media.Unattach(ctx, statusToDelete.Account, id); err != nil {
+		for _, id := range status.AttachmentIDs {
+			if _, err := u.media.Unattach(ctx, status.Account, id); err != nil {
 				errs.Appendf("error unattaching media: %w", err)
 			}
 		}
 	}
 
-	// delete all mention entries generated by this status
+	// Delete all mentions generated by this status.
 	// todo:u.state.DB.DeleteMentionsForStatus
-	for _, id := range statusToDelete.MentionIDs {
+	for _, id := range status.MentionIDs {
 		if err := u.state.DB.DeleteMentionByID(ctx, id); err != nil {
 			errs.Appendf("error deleting status mention: %w", err)
 		}
 	}
 
-	// delete all notification entries generated by this status
-	if err := u.state.DB.DeleteNotificationsForStatus(ctx, statusToDelete.ID); err != nil {
+	// Delete all notifications generated by this status.
+	if err := u.state.DB.DeleteNotificationsForStatus(ctx, status.ID); err != nil {
 		errs.Appendf("error deleting status notifications: %w", err)
 	}
 
-	// delete all bookmarks that point to this status
-	if err := u.state.DB.DeleteStatusBookmarksForStatus(ctx, statusToDelete.ID); err != nil {
+	// Delete all bookmarks of this status.
+	if err := u.state.DB.DeleteStatusBookmarksForStatus(ctx, status.ID); err != nil {
 		errs.Appendf("error deleting status bookmarks: %w", err)
 	}
 
-	// delete all faves of this status
-	if err := u.state.DB.DeleteStatusFavesForStatus(ctx, statusToDelete.ID); err != nil {
+	// Delete all faves of this status.
+	if err := u.state.DB.DeleteStatusFavesForStatus(ctx, status.ID); err != nil {
 		errs.Appendf("error deleting status faves: %w", err)
 	}
 
-	if pollID := statusToDelete.PollID; pollID != "" {
+	if pollID := status.PollID; pollID != "" {
 		// Delete this poll by ID from the database.
 		if err := u.state.DB.DeletePollByID(ctx, pollID); err != nil {
 			errs.Appendf("error deleting status poll: %w", err)
@@ -114,38 +135,42 @@ func (u *utils) wipeStatus(
 		_ = u.state.Workers.Scheduler.Cancel(pollID)
 	}
 
-	// delete all boosts for this status + remove them from timelines
+	// Get all boost of this status so that we can
+	// delete those boosts + remove them from timelines.
 	boosts, err := u.state.DB.GetStatusBoosts(
-		// we MUST set a barebones context here,
+		// We MUST set a barebones context here,
 		// as depending on where it came from the
 		// original BoostOf may already be gone.
 		gtscontext.SetBarebones(ctx),
-		statusToDelete.ID)
+		status.ID)
 	if err != nil {
 		errs.Appendf("error fetching status boosts: %w", err)
 	}
 
 	for _, boost := range boosts {
-		if err := u.surface.deleteStatusFromTimelines(ctx, boost.ID); err != nil {
-			errs.Appendf("error deleting boost from timelines: %w", err)
-		}
+		// Delete the boost itself.
 		if err := u.state.DB.DeleteStatusByID(ctx, boost.ID); err != nil {
 			errs.Appendf("error deleting boost: %w", err)
 		}
+
+		// Remove the boost from any and all timelines.
+		if err := u.surface.deleteStatusFromTimelines(ctx, boost.ID); err != nil {
+			errs.Appendf("error deleting boost from timelines: %w", err)
+		}
 	}
 
-	// delete this status from any and all timelines
-	if err := u.surface.deleteStatusFromTimelines(ctx, statusToDelete.ID); err != nil {
+	// Delete the status itself from any and all timelines.
+	if err := u.surface.deleteStatusFromTimelines(ctx, status.ID); err != nil {
 		errs.Appendf("error deleting status from timelines: %w", err)
 	}
 
-	// delete this status from any conversations that it's part of
-	if err := u.state.DB.DeleteStatusFromConversations(ctx, statusToDelete.ID); err != nil {
+	// Delete this status from any conversations it's part of.
+	if err := u.state.DB.DeleteStatusFromConversations(ctx, status.ID); err != nil {
 		errs.Appendf("error deleting status from conversations: %w", err)
 	}
 
-	// finally, delete the status itself
-	if err := u.state.DB.DeleteStatusByID(ctx, statusToDelete.ID); err != nil {
+	// Finally delete the status itself.
+	if err := u.state.DB.DeleteStatusByID(ctx, status.ID); err != nil {
 		errs.Appendf("error deleting status: %w", err)
 	}
 

internal/processing/workers/workers.go

@@ -70,10 +70,11 @@ func New(
 
 	// Init shared util funcs.
 	utils := &utils{
-		state:   state,
-		media:   media,
-		account: account,
-		surface: surface,
+		state:     state,
+		media:     media,
+		account:   account,
+		surface:   surface,
+		converter: converter,
 	}
 
 	return Processor{

internal/typeutils/internal.go

@@ -19,10 +19,15 @@ package typeutils
 
 import (
 	"context"
+	"errors"
+	"net/url"
 
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/id"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
 	"github.com/superseriousbusiness/gotosocial/internal/uris"
 	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
@@ -175,3 +180,91 @@ func StatusFaveToInteractionRequest(
 		Like:                 fave,
 	}, nil
 }
+
+func (c *Converter) StatusToSinBinStatus(
+	ctx context.Context,
+	status *gtsmodel.Status,
+) (*gtsmodel.SinBinStatus, error) {
+	// Populate status first so we have
+	// polls, mentions etc to copy over.
+	//
+	// ErrNoEntries is fine, we'll do our best.
+	err := c.state.DB.PopulateStatus(ctx, status)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return nil, gtserror.Newf("db error populating status: %w", err)
+	}
+
+	// Get domain of this status,
+	// empty for our own domain.
+	var domain string
+	if status.Account != nil {
+		domain = status.Account.Domain
+	} else {
+		uri, err := url.Parse(status.URI)
+		if err != nil {
+			return nil, gtserror.Newf("error parsing status URI: %w", err)
+		}
+
+		host := uri.Host
+		if host != config.GetAccountDomain() &&
+			host != config.GetHost() {
+			domain = host
+		}
+	}
+
+	// Extract just the image URLs from attachments.
+	attachLinks := make([]string, len(status.Attachments))
+	for i, attach := range status.Attachments {
+		if attach.IsLocal() {
+			attachLinks[i] = attach.URL
+		} else {
+			attachLinks[i] = attach.RemoteURL
+		}
+	}
+
+	// Extract just the target account URIs from mentions.
+	mentionTargetURIs := make([]string, 0, len(status.Mentions))
+	for _, mention := range status.Mentions {
+		if err := c.state.DB.PopulateMention(ctx, mention); err != nil {
+			log.Errorf(ctx, "error populating mention: %v", err)
+			continue
+		}
+
+		mentionTargetURIs = append(mentionTargetURIs, mention.TargetAccount.URI)
+	}
+
+	// Extract just the image URLs from emojis.
+	emojiLinks := make([]string, len(status.Emojis))
+	for i, emoji := range status.Emojis {
+		if emoji.IsLocal() {
+			emojiLinks[i] = emoji.ImageURL
+		} else {
+			emojiLinks[i] = emoji.ImageRemoteURL
+		}
+	}
+
+	// Extract just the poll option strings.
+	var pollOptions []string
+	if status.Poll != nil {
+		pollOptions = status.Poll.Options
+	}
+
+	return &gtsmodel.SinBinStatus{
+		ID:                  status.ID, // Reuse the status ID.
+		URI:                 status.URI,
+		URL:                 status.URL,
+		Domain:              domain,
+		AccountURI:          status.AccountURI,
+		InReplyToURI:        status.InReplyToURI,
+		Content:             status.Content,
+		AttachmentLinks:     attachLinks,
+		MentionTargetURIs:   mentionTargetURIs,
+		EmojiLinks:          emojiLinks,
+		PollOptions:         pollOptions,
+		ContentWarning:      status.ContentWarning,
+		Visibility:          status.Visibility,
+		Sensitive:           status.Sensitive,
+		Language:            status.Language,
+		ActivityStreamsType: status.ActivityStreamsType,
+	}, nil
+}

test/envparsing.sh

@@ -59,6 +59,7 @@ EXPECT=$(cat << "EOF"
         "poll-vote-ids-mem-ratio": 2,
         "poll-vote-mem-ratio": 2,
         "report-mem-ratio": 1,
+        "sin-bin-status-mem-ratio": 0.5,
         "status-bookmark-ids-mem-ratio": 2,
         "status-bookmark-mem-ratio": 0.5,
         "status-fave-ids-mem-ratio": 3,