add reject federatingdb handler

internal/federation/federatingdb/db.go

@@ -35,6 +35,7 @@ type DB interface {
 	pub.Database
 	Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error
 	Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error
+	Reject(ctx context.Context, reject vocab.ActivityStreamsReject) error
 	Announce(ctx context.Context, announce vocab.ActivityStreamsAnnounce) error
 }
 

internal/federation/federatingdb/reject.go

@@ -0,0 +1,119 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   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 federatingdb
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func (f *federatingDB) Reject(ctx context.Context, reject vocab.ActivityStreamsReject) error {
+	l := logrus.WithFields(
+		logrus.Fields{
+			"func": "Reject",
+		},
+	)
+
+	if logrus.GetLevel() >= logrus.DebugLevel {
+		i, err := marshalItem(reject)
+		if err != nil {
+			return err
+		}
+		l = l.WithField("reject", i)
+		l.Debug("entering Reject")
+	}
+
+	receivingAccount, _, fromFederatorChan := extractFromCtx(ctx)
+	if receivingAccount == nil || fromFederatorChan == nil {
+		// If the receiving account or federator channel wasn't set on the context, that means this request didn't pass
+		// through the API, but came from inside GtS as the result of another activity on this instance. That being so,
+		// we can safely just ignore this activity, since we know we've already processed it elsewhere.
+		return nil
+	}
+
+	rejectObject := reject.GetActivityStreamsObject()
+	if rejectObject == nil {
+		return errors.New("Reject: no object set on vocab.ActivityStreamsReject")
+	}
+
+	for iter := rejectObject.Begin(); iter != rejectObject.End(); iter = iter.Next() {
+		// check if the object is an IRI
+		if iter.IsIRI() {
+			// we have just the URI of whatever is being rejected, so we need to find out what it is
+			rejectedObjectIRI := iter.GetIRI()
+			if util.IsFollowPath(rejectedObjectIRI) {
+				// REJECT FOLLOW
+				gtsFollowRequest := &gtsmodel.FollowRequest{}
+				if err := f.db.GetWhere(ctx, []db.Where{{Key: "uri", Value: rejectedObjectIRI.String()}}, gtsFollowRequest); err != nil {
+					return fmt.Errorf("Reject: couldn't get follow request with id %s from the database: %s", rejectedObjectIRI.String(), err)
+				}
+
+				// make sure the addressee of the original follow is the same as whatever inbox this landed in
+				if gtsFollowRequest.AccountID != receivingAccount.ID {
+					return errors.New("Reject: follow object account and inbox account were not the same")
+				}
+
+				if _, err := f.db.RejectFollowRequest(ctx, gtsFollowRequest.AccountID, gtsFollowRequest.TargetAccountID); err != nil {
+					return err
+				}
+
+				return nil
+			}
+		}
+
+		// check if iter is an AP object / type
+		if iter.GetType() == nil {
+			continue
+		}
+
+		switch iter.GetType().GetTypeName() {
+		// we have the whole object so we can figure out what we're rejecting
+		case ap.ActivityFollow:
+			// REJECT FOLLOW
+			asFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
+			if !ok {
+				return errors.New("Reject: couldn't parse follow into vocab.ActivityStreamsFollow")
+			}
+			// convert the follow to something we can understand
+			gtsFollow, err := f.typeConverter.ASFollowToFollow(ctx, asFollow)
+			if err != nil {
+				return fmt.Errorf("Reject: error converting asfollow to gtsfollow: %s", err)
+			}
+			// make sure the addressee of the original follow is the same as whatever inbox this landed in
+			if gtsFollow.AccountID != receivingAccount.ID {
+				return errors.New("Reject: follow object account and inbox account were not the same")
+			}
+			if _, err := f.db.RejectFollowRequest(ctx, gtsFollow.AccountID, gtsFollow.TargetAccountID); err != nil {
+				return err
+			}
+
+			return nil
+		}
+	}
+
+	return nil
+}

internal/federation/federatingprotocol.go

@@ -250,16 +250,17 @@ func (f *federator) FederatingCallbacks(ctx context.Context) (wrapped pub.Federa
 		OnFollow: pub.OnFollowDoNothing,
 	}
 
+	// override some default behaviors and trigger our own side effects
 	other = []interface{}{
-		// override default undo behavior and trigger our own side effects
 		func(ctx context.Context, undo vocab.ActivityStreamsUndo) error {
 			return f.FederatingDB().Undo(ctx, undo)
 		},
-		// override default accept behavior and trigger our own side effects
 		func(ctx context.Context, accept vocab.ActivityStreamsAccept) error {
 			return f.FederatingDB().Accept(ctx, accept)
 		},
-		// override default announce behavior and trigger our own side effects
+		func(ctx context.Context, reject vocab.ActivityStreamsReject) error {
+			return f.FederatingDB().Reject(ctx, reject)
+		},
 		func(ctx context.Context, announce vocab.ActivityStreamsAnnounce) error {
 			return f.FederatingDB().Announce(ctx, announce)
 		},