GoToSocial/internal/federation/federatingdb/create.go

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/*
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"
"strings"
"github.com/go-fed/activity/streams/vocab"
"github.com/sirupsen/logrus"
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"github.com/superseriousbusiness/gotosocial/internal/ap"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
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"github.com/superseriousbusiness/gotosocial/internal/messages"
)
// 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 := logrus.WithFields(
logrus.Fields{
"func": "Create",
},
)
if logrus.GetLevel() >= logrus.DebugLevel {
i, err := marshalItem(asType)
if err != nil {
return err
}
l = l.WithField("create", i)
l.Debug("entering Create")
}
receivingAccount, requestingAccount, 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,
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// we can safely just ignore this activity, since we know we've already processed it elsewhere.
return nil
}
switch asType.GetTypeName() {
case ap.ActivityBlock:
// BLOCK SOMETHING
return f.activityBlock(ctx, asType, receivingAccount, requestingAccount, fromFederatorChan)
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case ap.ActivityCreate:
// CREATE SOMETHING
return f.activityCreate(ctx, asType, receivingAccount, requestingAccount, fromFederatorChan)
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case ap.ActivityFollow:
// FOLLOW SOMETHING
return f.activityFollow(ctx, asType, receivingAccount, requestingAccount, fromFederatorChan)
case ap.ActivityLike:
// LIKE SOMETHING
return f.activityLike(ctx, asType, receivingAccount, requestingAccount, fromFederatorChan)
}
return nil
}
/*
BLOCK HANDLERS
*/
func (f *federatingDB) activityBlock(ctx context.Context, asType vocab.Type, receiving *gtsmodel.Account, requestingAccount *gtsmodel.Account, fromFederatorChan chan messages.FromFederator) error {
blockable, ok := asType.(vocab.ActivityStreamsBlock)
if !ok {
return errors.New("activityBlock: could not convert type to block")
}
block, err := f.typeConverter.ASBlockToBlock(ctx, blockable)
if err != nil {
return fmt.Errorf("activityBlock: could not convert Block to gts model block")
}
newID, err := id.NewULID()
if err != nil {
return err
}
block.ID = newID
if err := f.db.Put(ctx, block); err != nil {
return fmt.Errorf("activityBlock: database error inserting block: %s", err)
}
fromFederatorChan <- messages.FromFederator{
APObjectType: ap.ActivityBlock,
APActivityType: ap.ActivityCreate,
GTSModel: block,
ReceivingAccount: receiving,
}
return nil
}
/*
CREATE HANDLERS
*/
func (f *federatingDB) activityCreate(ctx context.Context, asType vocab.Type, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account, fromFederatorChan chan messages.FromFederator) error {
create, ok := asType.(vocab.ActivityStreamsCreate)
if !ok {
return errors.New("activityCreate: could not convert type to create")
}
// create should have an object
object := create.GetActivityStreamsObject()
if object == nil {
return errors.New("Create had no Object")
}
errs := []string{}
// iterate through the object(s) to see what we're meant to be creating
for objectIter := object.Begin(); objectIter != object.End(); objectIter = objectIter.Next() {
asObjectType := objectIter.GetType()
if asObjectType == nil {
// currently we can't do anything with just a Create of something that's not an Object with a type
// TODO: process a Create with an Object that's just a URI or something
errs = append(errs, "object of Create was not a Type")
continue
}
// we have a type -- what is it?
asObjectTypeName := asObjectType.GetTypeName()
switch asObjectTypeName {
case ap.ObjectNote:
// CREATE A NOTE
if err := f.createNote(ctx, objectIter.GetActivityStreamsNote(), receivingAccount, requestingAccount, fromFederatorChan); err != nil {
errs = append(errs, err.Error())
}
default:
errs = append(errs, fmt.Sprintf("received an object on a Create that we couldn't handle: %s", asObjectType.GetTypeName()))
}
}
if len(errs) != 0 {
return fmt.Errorf("activityCreate: one or more errors while processing activity: %s", strings.Join(errs, "; "))
}
return nil
}
// createNote handles a Create activity with a Note type.
func (f *federatingDB) createNote(ctx context.Context, note vocab.ActivityStreamsNote, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account, fromFederatorChan chan messages.FromFederator) error {
l := logrus.WithFields(logrus.Fields{
"func": "createNote",
"receivingAccount": receivingAccount.URI,
"requestingAccount": requestingAccount.URI,
})
// Check if we have a forward.
// In other words, was the note posted to our inbox by at least one actor who actually created the note, or are they just forwarding it?
forward := true
// note should have an attributedTo
noteAttributedTo := note.GetActivityStreamsAttributedTo()
if noteAttributedTo == nil {
return errors.New("createNote: note had no attributedTo")
}
// compare the attributedTo(s) with the actor who posted this to our inbox
for attributedToIter := noteAttributedTo.Begin(); attributedToIter != noteAttributedTo.End(); attributedToIter = attributedToIter.Next() {
if !attributedToIter.IsIRI() {
continue
}
iri := attributedToIter.GetIRI()
if requestingAccount.URI == iri.String() {
// at least one creator of the note, and the actor who posted the note to our inbox, are the same, so it's not a forward
forward = false
}
}
// If we do have a forward, we should ignore the content for now and just dereference based on the URL/ID of the note instead, to get the note straight from the horse's mouth
if forward {
l.Trace("note is a forward")
id := note.GetJSONLDId()
if !id.IsIRI() {
// if the note id isn't an IRI, there's nothing we can do here
return nil
}
// pass the note iri into the processor and have it do the dereferencing instead of doing it here
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fromFederatorChan <- messages.FromFederator{
APObjectType: ap.ObjectNote,
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APActivityType: ap.ActivityCreate,
APIri: id.GetIRI(),
GTSModel: nil,
ReceivingAccount: receivingAccount,
}
return nil
}
// if we reach this point, we know it's not a forwarded status, so proceed with processing it as normal
status, err := f.typeConverter.ASStatusToStatus(ctx, note)
if err != nil {
return fmt.Errorf("createNote: error converting note to status: %s", err)
}
// id the status based on the time it was created
statusID, err := id.NewULIDFromTime(status.CreatedAt)
if err != nil {
return err
}
status.ID = statusID
if err := f.db.PutStatus(ctx, status); err != nil {
if err == db.ErrAlreadyExists {
// the status already exists in the database, which means we've already handled everything else,
// so we can just return nil here and be done with it.
return nil
}
// an actual error has happened
return fmt.Errorf("createNote: database error inserting status: %s", err)
}
fromFederatorChan <- messages.FromFederator{
APObjectType: ap.ObjectNote,
APActivityType: ap.ActivityCreate,
GTSModel: status,
ReceivingAccount: receivingAccount,
}
return nil
}
/*
FOLLOW HANDLERS
*/
func (f *federatingDB) activityFollow(ctx context.Context, asType vocab.Type, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account, fromFederatorChan chan messages.FromFederator) error {
follow, ok := asType.(vocab.ActivityStreamsFollow)
if !ok {
return errors.New("activityFollow: could not convert type to follow")
}
followRequest, err := f.typeConverter.ASFollowToFollowRequest(ctx, follow)
if err != nil {
return fmt.Errorf("activityFollow: could not convert Follow to follow request: %s", err)
}
newID, err := id.NewULID()
if err != nil {
return err
}
followRequest.ID = newID
if err := f.db.Put(ctx, followRequest); err != nil {
return fmt.Errorf("activityFollow: database error inserting follow request: %s", err)
}
fromFederatorChan <- messages.FromFederator{
APObjectType: ap.ActivityFollow,
APActivityType: ap.ActivityCreate,
GTSModel: followRequest,
ReceivingAccount: receivingAccount,
}
return nil
}
/*
LIKE HANDLERS
*/
func (f *federatingDB) activityLike(ctx context.Context, asType vocab.Type, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account, fromFederatorChan chan messages.FromFederator) error {
like, ok := asType.(vocab.ActivityStreamsLike)
if !ok {
return errors.New("activityLike: could not convert type to like")
}
fave, err := f.typeConverter.ASLikeToFave(ctx, like)
if err != nil {
return fmt.Errorf("activityLike: could not convert Like to fave: %s", err)
}
newID, err := id.NewULID()
if err != nil {
return err
}
fave.ID = newID
if err := f.db.Put(ctx, fave); err != nil {
return fmt.Errorf("activityLike: database error inserting fave: %s", err)
}
fromFederatorChan <- messages.FromFederator{
APObjectType: ap.ActivityLike,
APActivityType: ap.ActivityCreate,
GTSModel: fave,
ReceivingAccount: receivingAccount,
}
return nil
}