Notifications (#34)

Notifications working for:

* Mentions
* Faves
* New follow requests
* New followers

internal/federation/federatingdb/accept.go

@@ -0,0 +1,94 @@
+package federatingdb
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func (f *federatingDB) Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "Accept",
+			"asType": accept.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(accept)
+	if err != nil {
+		return err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	l.Debugf("received ACCEPT asType %s", string(b))
+
+	fromFederatorChanI := ctx.Value(util.APFromFederatorChanKey)
+	if fromFederatorChanI == nil {
+		l.Error("ACCEPT: from federator channel wasn't set on context")
+		return nil
+	}
+	fromFederatorChan, ok := fromFederatorChanI.(chan gtsmodel.FromFederator)
+	if !ok {
+		l.Error("ACCEPT: from federator channel was set on context but couldn't be parsed")
+		return nil
+	}
+
+	inboxAcctI := ctx.Value(util.APAccount)
+	if inboxAcctI == nil {
+		l.Error("ACCEPT: inbox account wasn't set on context")
+		return nil
+	}
+	inboxAcct, ok := inboxAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("ACCEPT: inbox account was set on context but couldn't be parsed")
+		return nil
+	}
+
+	acceptObject := accept.GetActivityStreamsObject()
+	if acceptObject == nil {
+		return errors.New("ACCEPT: no object set on vocab.ActivityStreamsAccept")
+	}
+
+	for iter := acceptObject.Begin(); iter != acceptObject.End(); iter = iter.Next() {
+		switch iter.GetType().GetTypeName() {
+		case string(gtsmodel.ActivityStreamsFollow):
+			// ACCEPT FOLLOW
+			asFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
+			if !ok {
+				return errors.New("ACCEPT: couldn't parse follow into vocab.ActivityStreamsFollow")
+			}
+			// convert the follow to something we can understand
+			gtsFollow, err := f.typeConverter.ASFollowToFollow(asFollow)
+			if err != nil {
+				return fmt.Errorf("ACCEPT: 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 != inboxAcct.ID {
+				return errors.New("ACCEPT: follow object account and inbox account were not the same")
+			}
+			follow, err := f.db.AcceptFollowRequest(gtsFollow.AccountID, gtsFollow.TargetAccountID)
+			if err != nil {
+				return err
+			}
+
+			fromFederatorChan <- gtsmodel.FromFederator{
+				APObjectType:     gtsmodel.ActivityStreamsFollow,
+				APActivityType:   gtsmodel.ActivityStreamsAccept,
+				GTSModel:         follow,
+				ReceivingAccount: inboxAcct,
+			}
+
+			return nil
+		}
+	}
+
+	return nil
+}

internal/federation/federatingdb/create.go

@@ -0,0 +1,161 @@
+/*
+   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"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// Create adds a new entry to the database which must be able to be
+// keyed by its id.
+//
+// Note that Activity values received from federated peers may also be
+// created in the database this way if the Federating Protocol is
+// enabled. The client may freely decide to store only the id instead of
+// the entire value.
+//
+// The library makes this call only after acquiring a lock first.
+//
+// Under certain conditions and network activities, Create may be called
+// multiple times for the same ActivityStreams object.
+func (f *federatingDB) Create(ctx context.Context, asType vocab.Type) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "Create",
+			"asType": asType.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(asType)
+	if err != nil {
+		return err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+
+	l.Debugf("received CREATE asType %s", string(b))
+
+	targetAcctI := ctx.Value(util.APAccount)
+	if targetAcctI == nil {
+		l.Error("target account wasn't set on context")
+		return nil
+	}
+	targetAcct, ok := targetAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("target account was set on context but couldn't be parsed")
+		return nil
+	}
+
+	fromFederatorChanI := ctx.Value(util.APFromFederatorChanKey)
+	if fromFederatorChanI == nil {
+		l.Error("from federator channel wasn't set on context")
+		return nil
+	}
+	fromFederatorChan, ok := fromFederatorChanI.(chan gtsmodel.FromFederator)
+	if !ok {
+		l.Error("from federator channel was set on context but couldn't be parsed")
+		return nil
+	}
+
+	switch asType.GetTypeName() {
+	case gtsmodel.ActivityStreamsCreate:
+		create, ok := asType.(vocab.ActivityStreamsCreate)
+		if !ok {
+			return errors.New("could not convert type to create")
+		}
+		object := create.GetActivityStreamsObject()
+		for objectIter := object.Begin(); objectIter != object.End(); objectIter = objectIter.Next() {
+			switch objectIter.GetType().GetTypeName() {
+			case gtsmodel.ActivityStreamsNote:
+				note := objectIter.GetActivityStreamsNote()
+				status, err := f.typeConverter.ASStatusToStatus(note)
+				if err != nil {
+					return fmt.Errorf("error converting note to status: %s", err)
+				}
+				if err := f.db.Put(status); err != nil {
+					if _, ok := err.(db.ErrAlreadyExists); ok {
+						return nil
+					}
+					return fmt.Errorf("database error inserting status: %s", err)
+				}
+
+				fromFederatorChan <- gtsmodel.FromFederator{
+					APObjectType:     gtsmodel.ActivityStreamsNote,
+					APActivityType:   gtsmodel.ActivityStreamsCreate,
+					GTSModel:         status,
+					ReceivingAccount: targetAcct,
+				}
+			}
+		}
+	case gtsmodel.ActivityStreamsFollow:
+		follow, ok := asType.(vocab.ActivityStreamsFollow)
+		if !ok {
+			return errors.New("could not convert type to follow")
+		}
+
+		followRequest, err := f.typeConverter.ASFollowToFollowRequest(follow)
+		if err != nil {
+			return fmt.Errorf("could not convert Follow to follow request: %s", err)
+		}
+
+		if err := f.db.Put(followRequest); err != nil {
+			return fmt.Errorf("database error inserting follow request: %s", err)
+		}
+
+		fromFederatorChan <- gtsmodel.FromFederator{
+			APObjectType:     gtsmodel.ActivityStreamsFollow,
+			APActivityType:   gtsmodel.ActivityStreamsCreate,
+			GTSModel:         followRequest,
+			ReceivingAccount: targetAcct,
+		}
+	case gtsmodel.ActivityStreamsLike:
+		like, ok := asType.(vocab.ActivityStreamsLike)
+		if !ok {
+			return errors.New("could not convert type to like")
+		}
+
+		fave, err := f.typeConverter.ASLikeToFave(like)
+		if err != nil {
+			return fmt.Errorf("could not convert Like to fave: %s", err)
+		}
+
+		if err := f.db.Put(fave); err != nil {
+			return fmt.Errorf("database error inserting fave: %s", err)
+		}
+
+		fromFederatorChan <- gtsmodel.FromFederator{
+			APObjectType:     gtsmodel.ActivityStreamsLike,
+			APActivityType:   gtsmodel.ActivityStreamsCreate,
+			GTSModel:         fave,
+			ReceivingAccount: targetAcct,
+		}
+	}
+	return nil
+}

internal/federation/federatingdb/db.go

@@ -0,0 +1,59 @@
+/*
+   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"
+	"sync"
+
+	"github.com/go-fed/activity/pub"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+)
+
+// DB wraps the pub.Database interface with a couple of custom functions for GoToSocial.
+type DB interface {
+	pub.Database
+	Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error
+	Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error
+}
+
+// FederatingDB uses the underlying DB interface to implement the go-fed pub.Database interface.
+// It doesn't care what the underlying implementation of the DB interface is, as long as it works.
+type federatingDB struct {
+	locks         *sync.Map
+	db            db.DB
+	config        *config.Config
+	log           *logrus.Logger
+	typeConverter typeutils.TypeConverter
+}
+
+// New returns a DB interface using the given database, config, and logger.
+func New(db db.DB, config *config.Config, log *logrus.Logger) DB {
+	return &federatingDB{
+		locks:         new(sync.Map),
+		db:            db,
+		config:        config,
+		log:           log,
+		typeConverter: typeutils.NewConverter(config, db),
+	}
+}

internal/federation/federatingdb/delete.go

@@ -0,0 +1,86 @@
+package federatingdb
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// Delete removes the entry with the given id.
+//
+// Delete is only called for federated objects. Deletes from the Social
+// Protocol instead call Update to create a Tombstone.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Delete(ctx context.Context, id *url.URL) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "Delete",
+			"id":   id.String(),
+		},
+	)
+	l.Debugf("received DELETE id %s", id.String())
+
+	inboxAcctI := ctx.Value(util.APAccount)
+	if inboxAcctI == nil {
+		l.Error("inbox account wasn't set on context")
+		return nil
+	}
+	inboxAcct, ok := inboxAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("inbox account was set on context but couldn't be parsed")
+		return nil
+	}
+
+	fromFederatorChanI := ctx.Value(util.APFromFederatorChanKey)
+	if fromFederatorChanI == nil {
+		l.Error("from federator channel wasn't set on context")
+		return nil
+	}
+	fromFederatorChan, ok := fromFederatorChanI.(chan gtsmodel.FromFederator)
+	if !ok {
+		l.Error("from federator channel was set on context but couldn't be parsed")
+		return nil
+	}
+
+	// in a delete we only get the URI, we can't know if we have a status or a profile or something else,
+	// so we have to try a few different things...
+	where := []db.Where{{Key: "uri", Value: id.String()}}
+
+	s := &gtsmodel.Status{}
+	if err := f.db.GetWhere(where, s); err == nil {
+		// it's a status
+		l.Debugf("uri is for status with id: %s", s.ID)
+		if err := f.db.DeleteByID(s.ID, &gtsmodel.Status{}); err != nil {
+			return fmt.Errorf("Delete: err deleting status: %s", err)
+		}
+		fromFederatorChan <- gtsmodel.FromFederator{
+			APObjectType:     gtsmodel.ActivityStreamsNote,
+			APActivityType:   gtsmodel.ActivityStreamsDelete,
+			GTSModel:         s,
+			ReceivingAccount: inboxAcct,
+		}
+	}
+
+	a := &gtsmodel.Account{}
+	if err := f.db.GetWhere(where, a); err == nil {
+		// it's an account
+		l.Debugf("uri is for an account with id: %s", s.ID)
+		if err := f.db.DeleteByID(a.ID, &gtsmodel.Account{}); err != nil {
+			return fmt.Errorf("Delete: err deleting account: %s", err)
+		}
+		fromFederatorChan <- gtsmodel.FromFederator{
+			APObjectType:     gtsmodel.ActivityStreamsProfile,
+			APActivityType:   gtsmodel.ActivityStreamsDelete,
+			GTSModel:         a,
+			ReceivingAccount: inboxAcct,
+		}
+	}
+
+	return nil
+}

internal/federation/federatingdb/exists.go

@@ -0,0 +1,24 @@
+package federatingdb
+
+import (
+	"context"
+	"net/url"
+
+	"github.com/sirupsen/logrus"
+)
+
+// Exists returns true if the database has an entry for the specified
+// id. It may not be owned by this application instance.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Exists(c context.Context, id *url.URL) (exists bool, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "Exists",
+			"id":   id.String(),
+		},
+	)
+	l.Debugf("entering EXISTS function with id %s", id.String())
+
+	return false, nil
+}

internal/federation/federatingdb/followers.go

@@ -0,0 +1,55 @@
+package federatingdb
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+// Followers obtains the Followers Collection for an actor with the
+// given id.
+//
+// If modified, the library will then call Update.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Followers(c context.Context, actorIRI *url.URL) (followers vocab.ActivityStreamsCollection, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":     "Followers",
+			"actorIRI": actorIRI.String(),
+		},
+	)
+	l.Debugf("entering FOLLOWERS function with actorIRI %s", actorIRI.String())
+
+	acct := &gtsmodel.Account{}
+	if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: actorIRI.String()}}, acct); err != nil {
+		return nil, fmt.Errorf("db error getting account with uri %s: %s", actorIRI.String(), err)
+	}
+
+	acctFollowers := []gtsmodel.Follow{}
+	if err := f.db.GetFollowersByAccountID(acct.ID, &acctFollowers); err != nil {
+		return nil, fmt.Errorf("db error getting followers for account id %s: %s", acct.ID, err)
+	}
+
+	followers = streams.NewActivityStreamsCollection()
+	items := streams.NewActivityStreamsItemsProperty()
+	for _, follow := range acctFollowers {
+		gtsFollower := &gtsmodel.Account{}
+		if err := f.db.GetByID(follow.AccountID, gtsFollower); err != nil {
+			return nil, fmt.Errorf("db error getting account id %s: %s", follow.AccountID, err)
+		}
+		uri, err := url.Parse(gtsFollower.URI)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing %s as url: %s", gtsFollower.URI, err)
+		}
+		items.AppendIRI(uri)
+	}
+	followers.SetActivityStreamsItems(items)
+	return
+}

internal/federation/federatingdb/following.go

@@ -0,0 +1,55 @@
+package federatingdb
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+// Following obtains the Following Collection for an actor with the
+// given id.
+//
+// If modified, the library will then call Update.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Following(c context.Context, actorIRI *url.URL) (following vocab.ActivityStreamsCollection, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":     "Following",
+			"actorIRI": actorIRI.String(),
+		},
+	)
+	l.Debugf("entering FOLLOWING function with actorIRI %s", actorIRI.String())
+
+	acct := &gtsmodel.Account{}
+	if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: actorIRI.String()}}, acct); err != nil {
+		return nil, fmt.Errorf("db error getting account with uri %s: %s", actorIRI.String(), err)
+	}
+
+	acctFollowing := []gtsmodel.Follow{}
+	if err := f.db.GetFollowingByAccountID(acct.ID, &acctFollowing); err != nil {
+		return nil, fmt.Errorf("db error getting following for account id %s: %s", acct.ID, err)
+	}
+
+	following = streams.NewActivityStreamsCollection()
+	items := streams.NewActivityStreamsItemsProperty()
+	for _, follow := range acctFollowing {
+		gtsFollowing := &gtsmodel.Account{}
+		if err := f.db.GetByID(follow.AccountID, gtsFollowing); err != nil {
+			return nil, fmt.Errorf("db error getting account id %s: %s", follow.AccountID, err)
+		}
+		uri, err := url.Parse(gtsFollowing.URI)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing %s as url: %s", gtsFollowing.URI, err)
+		}
+		items.AppendIRI(uri)
+	}
+	following.SetActivityStreamsItems(items)
+	return
+}

internal/federation/federatingdb/get.go

@@ -0,0 +1,83 @@
+/*
+   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"
+	"net/url"
+
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// Get returns the database entry for the specified id.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Get(c context.Context, id *url.URL) (value vocab.Type, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "Get",
+			"id":   id.String(),
+		},
+	)
+	l.Debug("entering GET function")
+
+	if util.IsUserPath(id) {
+		acct := &gtsmodel.Account{}
+		if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: id.String()}}, acct); err != nil {
+			return nil, err
+		}
+		l.Debug("is user path! returning account")
+		return f.typeConverter.AccountToAS(acct)
+	}
+
+	if util.IsFollowersPath(id) {
+		acct := &gtsmodel.Account{}
+		if err := f.db.GetWhere([]db.Where{{Key: "followers_uri", Value: id.String()}}, acct); err != nil {
+			return nil, err
+		}
+
+		followersURI, err := url.Parse(acct.FollowersURI)
+		if err != nil {
+			return nil, err
+		}
+
+		return f.Followers(c, followersURI)
+	}
+
+	if util.IsFollowingPath(id) {
+		acct := &gtsmodel.Account{}
+		if err := f.db.GetWhere([]db.Where{{Key: "following_uri", Value: id.String()}}, acct); err != nil {
+			return nil, err
+		}
+
+		followingURI, err := url.Parse(acct.FollowingURI)
+		if err != nil {
+			return nil, err
+		}
+
+		return f.Following(c, followingURI)
+	}
+
+	return nil, errors.New("could not get")
+}

internal/federation/federatingdb/inbox.go

@@ -0,0 +1,73 @@
+package federatingdb
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/pub"
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// InboxContains returns true if the OrderedCollection at 'inbox'
+// contains the specified 'id'.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) InboxContains(c context.Context, inbox, id *url.URL) (contains bool, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "InboxContains",
+			"id":   id.String(),
+		},
+	)
+	l.Debugf("entering INBOXCONTAINS function with for inbox %s and id %s", inbox.String(), id.String())
+
+	if !util.IsInboxPath(inbox) {
+		return false, fmt.Errorf("%s is not an inbox URI", inbox.String())
+	}
+
+	activityI := c.Value(util.APActivity)
+	if activityI == nil {
+		return false, fmt.Errorf("no activity was set for id %s", id.String())
+	}
+	activity, ok := activityI.(pub.Activity)
+	if !ok || activity == nil {
+		return false, fmt.Errorf("could not parse contextual activity for id %s", id.String())
+	}
+
+	l.Debugf("activity type %s for id %s", activity.GetTypeName(), id.String())
+
+	return false, nil
+}
+
+// GetInbox returns the first ordered collection page of the outbox at
+// the specified IRI, for prepending new items.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) GetInbox(c context.Context, inboxIRI *url.URL) (inbox vocab.ActivityStreamsOrderedCollectionPage, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "GetInbox",
+		},
+	)
+	l.Debugf("entering GETINBOX function with inboxIRI %s", inboxIRI.String())
+	return streams.NewActivityStreamsOrderedCollectionPage(), nil
+}
+
+// SetInbox saves the inbox value given from GetInbox, with new items
+// prepended. Note that the new items must not be added as independent
+// database entries. Separate calls to Create will do that.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) SetInbox(c context.Context, inbox vocab.ActivityStreamsOrderedCollectionPage) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "SetInbox",
+		},
+	)
+	l.Debug("entering SETINBOX function")
+	return nil
+}

internal/federation/federatingdb/liked.go

@@ -0,0 +1,26 @@
+package federatingdb
+
+import (
+	"context"
+	"net/url"
+
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+)
+
+// Liked obtains the Liked Collection for an actor with the
+// given id.
+//
+// If modified, the library will then call Update.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Liked(c context.Context, actorIRI *url.URL) (liked vocab.ActivityStreamsCollection, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":     "Liked",
+			"actorIRI": actorIRI.String(),
+		},
+	)
+	l.Debugf("entering LIKED function with actorIRI %s", actorIRI.String())
+	return nil, nil
+}

internal/federation/federatingdb/lock.go

@@ -0,0 +1,70 @@
+/*
+   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"
+	"net/url"
+	"sync"
+)
+
+// Lock takes a lock for the object at the specified id. If an error
+// is returned, the lock must not have been taken.
+//
+// The lock must be able to succeed for an id that does not exist in
+// the database. This means acquiring the lock does not guarantee the
+// entry exists in the database.
+//
+// Locks are encouraged to be lightweight and in the Go layer, as some
+// processes require tight loops acquiring and releasing locks.
+//
+// Used to ensure race conditions in multiple requests do not occur.
+func (f *federatingDB) Lock(c context.Context, id *url.URL) error {
+	// Before any other Database methods are called, the relevant `id`
+	// entries are locked to allow for fine-grained concurrency.
+
+	// Strategy: create a new lock, if stored, continue. Otherwise, lock the
+	// existing mutex.
+	mu := &sync.Mutex{}
+	mu.Lock() // Optimistically lock if we do store it.
+	i, loaded := f.locks.LoadOrStore(id.String(), mu)
+	if loaded {
+		mu = i.(*sync.Mutex)
+		mu.Lock()
+	}
+	return nil
+}
+
+// Unlock makes the lock for the object at the specified id available.
+// If an error is returned, the lock must have still been freed.
+//
+// Used to ensure race conditions in multiple requests do not occur.
+func (f *federatingDB) Unlock(c context.Context, id *url.URL) error {
+	// Once Go-Fed is done calling Database methods, the relevant `id`
+	// entries are unlocked.
+
+	i, ok := f.locks.Load(id.String())
+	if !ok {
+		return errors.New("missing an id in unlock")
+	}
+	mu := i.(*sync.Mutex)
+	mu.Unlock()
+	return nil
+}

internal/federation/federatingdb/outbox.go

@@ -0,0 +1,71 @@
+package federatingdb
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// GetOutbox returns the first ordered collection page of the outbox
+// at the specified IRI, for prepending new items.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) GetOutbox(c context.Context, outboxIRI *url.URL) (inbox vocab.ActivityStreamsOrderedCollectionPage, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "GetOutbox",
+		},
+	)
+	l.Debug("entering GETOUTBOX function")
+
+	return streams.NewActivityStreamsOrderedCollectionPage(), nil
+}
+
+// SetOutbox saves the outbox value given from GetOutbox, with new items
+// prepended. Note that the new items must not be added as independent
+// database entries. Separate calls to Create will do that.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) SetOutbox(c context.Context, outbox vocab.ActivityStreamsOrderedCollectionPage) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "SetOutbox",
+		},
+	)
+	l.Debug("entering SETOUTBOX function")
+
+	return nil
+}
+
+// OutboxForInbox fetches the corresponding actor's outbox IRI for the
+// actor's inbox IRI.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) OutboxForInbox(c context.Context, inboxIRI *url.URL) (outboxIRI *url.URL, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":     "OutboxForInbox",
+			"inboxIRI": inboxIRI.String(),
+		},
+	)
+	l.Debugf("entering OUTBOXFORINBOX function with inboxIRI %s", inboxIRI.String())
+
+	if !util.IsInboxPath(inboxIRI) {
+		return nil, fmt.Errorf("%s is not an inbox URI", inboxIRI.String())
+	}
+	acct := &gtsmodel.Account{}
+	if err := f.db.GetWhere([]db.Where{{Key: "inbox_uri", Value: inboxIRI.String()}}, acct); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			return nil, fmt.Errorf("no actor found that corresponds to inbox %s", inboxIRI.String())
+		}
+		return nil, fmt.Errorf("db error searching for actor with inbox %s", inboxIRI.String())
+	}
+	return url.Parse(acct.OutboxURI)
+}

internal/federation/federatingdb/owns.go

@@ -0,0 +1,123 @@
+/*
+   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"
+	"fmt"
+	"net/url"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// Owns returns true if the IRI belongs to this instance, and if
+// the database has an entry for the IRI.
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Owns(c context.Context, id *url.URL) (bool, error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func": "Owns",
+			"id":   id.String(),
+		},
+	)
+	l.Debugf("entering OWNS function with id %s", id.String())
+
+	// if the id host isn't this instance host, we don't own this IRI
+	if id.Host != f.config.Host {
+		l.Debugf("we DO NOT own activity because the host is %s not %s", id.Host, f.config.Host)
+		return false, nil
+	}
+
+	// apparently it belongs to this host, so what *is* it?
+
+	// check if it's a status, eg /users/example_username/statuses/SOME_UUID_OF_A_STATUS
+	if util.IsStatusesPath(id) {
+		_, uid, err := util.ParseStatusesPath(id)
+		if err != nil {
+			return false, fmt.Errorf("error parsing statuses path for url %s: %s", id.String(), err)
+		}
+		if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: uid}}, &gtsmodel.Status{}); err != nil {
+			if _, ok := err.(db.ErrNoEntries); ok {
+				// there are no entries for this status
+				return false, nil
+			}
+			// an actual error happened
+			return false, fmt.Errorf("database error fetching status with id %s: %s", uid, err)
+		}
+		l.Debug("we DO own this")
+		return true, nil
+	}
+
+	// check if it's a user, eg /users/example_username
+	if util.IsUserPath(id) {
+		username, err := util.ParseUserPath(id)
+		if err != nil {
+			return false, fmt.Errorf("error parsing statuses path for url %s: %s", id.String(), err)
+		}
+		if err := f.db.GetLocalAccountByUsername(username, &gtsmodel.Account{}); err != nil {
+			if _, ok := err.(db.ErrNoEntries); ok {
+				// there are no entries for this username
+				return false, nil
+			}
+			// an actual error happened
+			return false, fmt.Errorf("database error fetching account with username %s: %s", username, err)
+		}
+		l.Debug("we DO own this")
+		return true, nil
+	}
+
+	if util.IsFollowersPath(id) {
+		username, err := util.ParseFollowersPath(id)
+		if err != nil {
+			return false, fmt.Errorf("error parsing statuses path for url %s: %s", id.String(), err)
+		}
+		if err := f.db.GetLocalAccountByUsername(username, &gtsmodel.Account{}); err != nil {
+			if _, ok := err.(db.ErrNoEntries); ok {
+				// there are no entries for this username
+				return false, nil
+			}
+			// an actual error happened
+			return false, fmt.Errorf("database error fetching account with username %s: %s", username, err)
+		}
+		l.Debug("we DO own this")
+		return true, nil
+	}
+
+	if util.IsFollowingPath(id) {
+		username, err := util.ParseFollowingPath(id)
+		if err != nil {
+			return false, fmt.Errorf("error parsing statuses path for url %s: %s", id.String(), err)
+		}
+		if err := f.db.GetLocalAccountByUsername(username, &gtsmodel.Account{}); err != nil {
+			if _, ok := err.(db.ErrNoEntries); ok {
+				// there are no entries for this username
+				return false, nil
+			}
+			// an actual error happened
+			return false, fmt.Errorf("database error fetching account with username %s: %s", username, err)
+		}
+		l.Debug("we DO own this")
+		return true, nil
+	}
+
+	return false, fmt.Errorf("could not match activityID: %s", id.String())
+}

internal/federation/federatingdb/undo.go

@@ -0,0 +1,89 @@
+package federatingdb
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func (f *federatingDB) Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "Undo",
+			"asType": undo.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(undo)
+	if err != nil {
+		return err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	l.Debugf("received UNDO asType %s", string(b))
+
+	targetAcctI := ctx.Value(util.APAccount)
+	if targetAcctI == nil {
+		l.Error("UNDO: target account wasn't set on context")
+		return nil
+	}
+	targetAcct, ok := targetAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("UNDO: target account was set on context but couldn't be parsed")
+		return nil
+	}
+
+	undoObject := undo.GetActivityStreamsObject()
+	if undoObject == nil {
+		return errors.New("UNDO: no object set on vocab.ActivityStreamsUndo")
+	}
+
+	for iter := undoObject.Begin(); iter != undoObject.End(); iter = iter.Next() {
+		switch iter.GetType().GetTypeName() {
+		case string(gtsmodel.ActivityStreamsFollow):
+			// UNDO FOLLOW
+			ASFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
+			if !ok {
+				return errors.New("UNDO: couldn't parse follow into vocab.ActivityStreamsFollow")
+			}
+			// make sure the actor owns the follow
+			if !sameActor(undo.GetActivityStreamsActor(), ASFollow.GetActivityStreamsActor()) {
+				return errors.New("UNDO: follow actor and activity actor not the same")
+			}
+			// convert the follow to something we can understand
+			gtsFollow, err := f.typeConverter.ASFollowToFollow(ASFollow)
+			if err != nil {
+				return fmt.Errorf("UNDO: 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.TargetAccountID != targetAcct.ID {
+				return errors.New("UNDO: follow object account and inbox account were not the same")
+			}
+			// delete any existing FOLLOW
+			if err := f.db.DeleteWhere([]db.Where{{Key: "uri", Value: gtsFollow.URI}}, &gtsmodel.Follow{}); err != nil {
+				return fmt.Errorf("UNDO: db error removing follow: %s", err)
+			}
+			// delete any existing FOLLOW REQUEST
+			if err := f.db.DeleteWhere([]db.Where{{Key: "uri", Value: gtsFollow.URI}}, &gtsmodel.FollowRequest{}); err != nil {
+				return fmt.Errorf("UNDO: db error removing follow request: %s", err)
+			}
+			l.Debug("follow undone")
+			return nil
+		case string(gtsmodel.ActivityStreamsLike):
+			// UNDO LIKE
+		case string(gtsmodel.ActivityStreamsAnnounce):
+			// UNDO BOOST/REBLOG/ANNOUNCE
+		}
+	}
+
+	return nil
+}

internal/federation/federatingdb/update.go

@@ -0,0 +1,142 @@
+package federatingdb
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+// Update sets an existing entry to the database based on the value's
+// id.
+//
+// Note that Activity values received from federated peers may also be
+// updated in the database this way if the Federating Protocol is
+// enabled. The client may freely decide to store only the id instead of
+// the entire value.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) Update(ctx context.Context, asType vocab.Type) error {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "Update",
+			"asType": asType.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(asType)
+	if err != nil {
+		return err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+
+	l.Debugf("received UPDATE asType %s", string(b))
+
+	receivingAcctI := ctx.Value(util.APAccount)
+	if receivingAcctI == nil {
+		l.Error("receiving account wasn't set on context")
+	}
+	receivingAcct, ok := receivingAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("receiving account was set on context but couldn't be parsed")
+	}
+
+	requestingAcctI := ctx.Value(util.APRequestingAccount)
+	if receivingAcctI == nil {
+		l.Error("requesting account wasn't set on context")
+	}
+	requestingAcct, ok := requestingAcctI.(*gtsmodel.Account)
+	if !ok {
+		l.Error("requesting account was set on context but couldn't be parsed")
+	}
+
+	fromFederatorChanI := ctx.Value(util.APFromFederatorChanKey)
+	if fromFederatorChanI == nil {
+		l.Error("from federator channel wasn't set on context")
+	}
+	fromFederatorChan, ok := fromFederatorChanI.(chan gtsmodel.FromFederator)
+	if !ok {
+		l.Error("from federator channel was set on context but couldn't be parsed")
+	}
+
+	typeName := asType.GetTypeName()
+	if typeName == gtsmodel.ActivityStreamsApplication ||
+		typeName == gtsmodel.ActivityStreamsGroup ||
+		typeName == gtsmodel.ActivityStreamsOrganization ||
+		typeName == gtsmodel.ActivityStreamsPerson ||
+		typeName == gtsmodel.ActivityStreamsService {
+		// it's an UPDATE to some kind of account
+		var accountable typeutils.Accountable
+
+		switch asType.GetTypeName() {
+		case gtsmodel.ActivityStreamsApplication:
+			l.Debug("got update for APPLICATION")
+			i, ok := asType.(vocab.ActivityStreamsApplication)
+			if !ok {
+				return errors.New("could not convert type to application")
+			}
+			accountable = i
+		case gtsmodel.ActivityStreamsGroup:
+			l.Debug("got update for GROUP")
+			i, ok := asType.(vocab.ActivityStreamsGroup)
+			if !ok {
+				return errors.New("could not convert type to group")
+			}
+			accountable = i
+		case gtsmodel.ActivityStreamsOrganization:
+			l.Debug("got update for ORGANIZATION")
+			i, ok := asType.(vocab.ActivityStreamsOrganization)
+			if !ok {
+				return errors.New("could not convert type to organization")
+			}
+			accountable = i
+		case gtsmodel.ActivityStreamsPerson:
+			l.Debug("got update for PERSON")
+			i, ok := asType.(vocab.ActivityStreamsPerson)
+			if !ok {
+				return errors.New("could not convert type to person")
+			}
+			accountable = i
+		case gtsmodel.ActivityStreamsService:
+			l.Debug("got update for SERVICE")
+			i, ok := asType.(vocab.ActivityStreamsService)
+			if !ok {
+				return errors.New("could not convert type to service")
+			}
+			accountable = i
+		}
+
+		updatedAcct, err := f.typeConverter.ASRepresentationToAccount(accountable, true)
+		if err != nil {
+			return fmt.Errorf("error converting to account: %s", err)
+		}
+
+		if requestingAcct.URI != updatedAcct.URI {
+			return fmt.Errorf("update for account %s was requested by account %s, this is not valid", updatedAcct.URI, requestingAcct.URI)
+		}
+
+		updatedAcct.ID = requestingAcct.ID // set this here so the db will update properly instead of trying to PUT this and getting constraint issues
+		if err := f.db.UpdateByID(requestingAcct.ID, updatedAcct); err != nil {
+			return fmt.Errorf("database error inserting updated account: %s", err)
+		}
+
+		fromFederatorChan <- gtsmodel.FromFederator{
+			APObjectType:     gtsmodel.ActivityStreamsProfile,
+			APActivityType:   gtsmodel.ActivityStreamsUpdate,
+			GTSModel:         updatedAcct,
+			ReceivingAccount: receivingAcct,
+		}
+
+	}
+
+	return nil
+}

internal/federation/federatingdb/util.go

@@ -0,0 +1,187 @@
+/*
+   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"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/google/uuid"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func sameActor(activityActor vocab.ActivityStreamsActorProperty, followActor vocab.ActivityStreamsActorProperty) bool {
+	if activityActor == nil || followActor == nil {
+		return false
+	}
+	for aIter := activityActor.Begin(); aIter != activityActor.End(); aIter = aIter.Next() {
+		for fIter := followActor.Begin(); fIter != followActor.End(); fIter = fIter.Next() {
+			if aIter.GetIRI() == nil {
+				return false
+			}
+			if fIter.GetIRI() == nil {
+				return false
+			}
+			if aIter.GetIRI().String() == fIter.GetIRI().String() {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// NewID creates a new IRI id for the provided activity or object. The
+// implementation does not need to set the 'id' property and simply
+// needs to determine the value.
+//
+// The go-fed library will handle setting the 'id' property on the
+// activity or object provided with the value returned.
+func (f *federatingDB) NewID(c context.Context, t vocab.Type) (id *url.URL, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":   "NewID",
+			"asType": t.GetTypeName(),
+		},
+	)
+	m, err := streams.Serialize(t)
+	if err != nil {
+		return nil, err
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return nil, err
+	}
+	l.Debugf("received NEWID request for asType %s", string(b))
+
+	switch t.GetTypeName() {
+	case gtsmodel.ActivityStreamsFollow:
+		// FOLLOW
+		// ID might already be set on a follow we've created, so check it here and return it if it is
+		follow, ok := t.(vocab.ActivityStreamsFollow)
+		if !ok {
+			return nil, errors.New("newid: follow couldn't be parsed into vocab.ActivityStreamsFollow")
+		}
+		idProp := follow.GetJSONLDId()
+		if idProp != nil {
+			if idProp.IsIRI() {
+				return idProp.GetIRI(), nil
+			}
+		}
+		// it's not set so create one based on the actor set on the follow (ie., the followER not the followEE)
+		actorProp := follow.GetActivityStreamsActor()
+		if actorProp != nil {
+			for iter := actorProp.Begin(); iter != actorProp.End(); iter = iter.Next() {
+				// take the IRI of the first actor we can find (there should only be one)
+				if iter.IsIRI() {
+					actorAccount := &gtsmodel.Account{}
+					if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: iter.GetIRI().String()}}, actorAccount); err == nil { // if there's an error here, just use the fallback behavior -- we don't need to return an error here
+						return url.Parse(util.GenerateURIForFollow(actorAccount.Username, f.config.Protocol, f.config.Host, uuid.NewString()))
+					}
+				}
+			}
+		}
+	case gtsmodel.ActivityStreamsNote:
+		// NOTE aka STATUS
+		// ID might already be set on a note we've created, so check it here and return it if it is
+		note, ok := t.(vocab.ActivityStreamsNote)
+		if !ok {
+			return nil, errors.New("newid: note couldn't be parsed into vocab.ActivityStreamsNote")
+		}
+		idProp := note.GetJSONLDId()
+		if idProp != nil {
+			if idProp.IsIRI() {
+				return idProp.GetIRI(), nil
+			}
+		}
+	case gtsmodel.ActivityStreamsLike:
+		// LIKE aka FAVE
+		// ID might already be set on a fave we've created, so check it here and return it if it is
+		fave, ok := t.(vocab.ActivityStreamsLike)
+		if !ok {
+			return nil, errors.New("newid: fave couldn't be parsed into vocab.ActivityStreamsLike")
+		}
+		idProp := fave.GetJSONLDId()
+		if idProp != nil {
+			if idProp.IsIRI() {
+				return idProp.GetIRI(), nil
+			}
+		}
+	}
+
+	// fallback default behavior: just return a random UUID after our protocol and host
+	return url.Parse(fmt.Sprintf("%s://%s/%s", f.config.Protocol, f.config.Host, uuid.NewString()))
+}
+
+// ActorForOutbox fetches the actor's IRI for the given outbox IRI.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) ActorForOutbox(c context.Context, outboxIRI *url.URL) (actorIRI *url.URL, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":     "ActorForOutbox",
+			"inboxIRI": outboxIRI.String(),
+		},
+	)
+	l.Debugf("entering ACTORFOROUTBOX function with outboxIRI %s", outboxIRI.String())
+
+	if !util.IsOutboxPath(outboxIRI) {
+		return nil, fmt.Errorf("%s is not an outbox URI", outboxIRI.String())
+	}
+	acct := &gtsmodel.Account{}
+	if err := f.db.GetWhere([]db.Where{{Key: "outbox_uri", Value: outboxIRI.String()}}, acct); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			return nil, fmt.Errorf("no actor found that corresponds to outbox %s", outboxIRI.String())
+		}
+		return nil, fmt.Errorf("db error searching for actor with outbox %s", outboxIRI.String())
+	}
+	return url.Parse(acct.URI)
+}
+
+// ActorForInbox fetches the actor's IRI for the given outbox IRI.
+//
+// The library makes this call only after acquiring a lock first.
+func (f *federatingDB) ActorForInbox(c context.Context, inboxIRI *url.URL) (actorIRI *url.URL, err error) {
+	l := f.log.WithFields(
+		logrus.Fields{
+			"func":     "ActorForInbox",
+			"inboxIRI": inboxIRI.String(),
+		},
+	)
+	l.Debugf("entering ACTORFORINBOX function with inboxIRI %s", inboxIRI.String())
+
+	if !util.IsInboxPath(inboxIRI) {
+		return nil, fmt.Errorf("%s is not an inbox URI", inboxIRI.String())
+	}
+	acct := &gtsmodel.Account{}
+	if err := f.db.GetWhere([]db.Where{{Key: "inbox_uri", Value: inboxIRI.String()}}, acct); err != nil {
+		if _, ok := err.(db.ErrNoEntries); ok {
+			return nil, fmt.Errorf("no actor found that corresponds to inbox %s", inboxIRI.String())
+		}
+		return nil, fmt.Errorf("db error searching for actor with inbox %s", inboxIRI.String())
+	}
+	return url.Parse(acct.URI)
+}