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create.go
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// 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 federatingdb
import (
"context"
"errors"
"fmt"
"codeberg.org/gruf/go-logger/v2/level"
"github.com/miekg/dns"
"github.com/superseriousbusiness/activity/streams/vocab"
"github.com/superseriousbusiness/gotosocial/internal/ap"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
"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"
)
// 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 {
if log.Level() >= level.TRACE {
i, err := marshalItem(asType)
if err != nil {
return err
}
log.
WithContext(ctx).
WithField("create", i).
Trace("entering Create")
}
activityContext := getActivityContext(ctx)
if activityContext.internal {
return nil // Already processed.
}
requestingAcct := activityContext.requestingAcct
receivingAcct := activityContext.receivingAcct
if requestingAcct.IsMoving() {
// A Moving account
// can't do this.
return nil
}
switch asType.GetTypeName() {
case ap.ActivityBlock:
// BLOCK SOMETHING
return f.activityBlock(ctx, asType, receivingAcct, requestingAcct)
case ap.ActivityCreate:
// CREATE SOMETHING
return f.activityCreate(ctx, asType, receivingAcct, requestingAcct)
case ap.ActivityFollow:
// FOLLOW SOMETHING
return f.activityFollow(ctx, asType, receivingAcct, requestingAcct)
case ap.ActivityLike:
// LIKE SOMETHING
return f.activityLike(ctx, asType, receivingAcct, requestingAcct)
case ap.ActivityFlag:
// FLAG / REPORT SOMETHING
return f.activityFlag(ctx, asType, receivingAcct, requestingAcct)
}
return nil
}
/*
BLOCK HANDLERS
*/
func (f *federatingDB) activityBlock(ctx context.Context, asType vocab.Type, receiving *gtsmodel.Account, requesting *gtsmodel.Account) error {
blockable, ok := asType.(vocab.ActivityStreamsBlock)
if !ok {
return errors.New("activityBlock: could not convert type to block")
}
block, err := f.converter.ASBlockToBlock(ctx, blockable)
if err != nil {
return fmt.Errorf("activityBlock: could not convert Block to gts model block")
}
if block.AccountID != requesting.ID {
return fmt.Errorf(
"activityBlock: requestingAccount %s is not Block actor account %s",
requesting.URI, block.Account.URI,
)
}
if block.TargetAccountID != receiving.ID {
return fmt.Errorf(
"activityBlock: inbox account %s is not Block object account %s",
receiving.URI, block.TargetAccount.URI,
)
}
block.ID = id.NewULID()
if err := f.state.DB.PutBlock(ctx, block); err != nil {
return fmt.Errorf("activityBlock: database error inserting block: %s", err)
}
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APObjectType: ap.ActivityBlock,
APActivityType: ap.ActivityCreate,
GTSModel: block,
Receiving: receiving,
Requesting: requesting,
})
return nil
}
/*
CREATE HANDLERS
*/
// activityCreate handles asType Create by checking
// the Object entries of the Create and calling other
// handlers as appropriate.
func (f *federatingDB) activityCreate(
ctx context.Context,
asType vocab.Type,
receivingAccount *gtsmodel.Account,
requestingAccount *gtsmodel.Account,
) error {
create, ok := asType.(vocab.ActivityStreamsCreate)
if !ok {
return gtserror.Newf("could not convert asType %T to ActivityStreamsCreate", asType)
}
var errs gtserror.MultiError
// Extract objects from create activity.
objects := ap.ExtractObjects(create)
// Extract PollOptionables (votes!) from objects slice.
optionables, objects := ap.ExtractPollOptionables(objects)
if len(optionables) > 0 {
// Handle provided poll vote(s) creation, this can
// be for single or multiple votes in the same poll.
err := f.createPollOptionables(ctx,
receivingAccount,
requestingAccount,
optionables,
)
if err != nil {
errs.Appendf("error creating poll vote(s): %w", err)
}
}
// Extract Statusables from objects slice (this must be
// done AFTER extracting options due to how AS typing works).
statusables, objects := ap.ExtractStatusables(objects)
for _, statusable := range statusables {
// Check if this is a forwarded object, i.e. did
// the account making the request also create this?
forwarded := !isSender(statusable, requestingAccount)
// Handle create event for this statusable.
if err := f.createStatusable(ctx,
receivingAccount,
requestingAccount,
statusable,
forwarded,
); err != nil {
errs.Appendf("error creating statusable: %w", err)
}
}
if len(objects) > 0 {
// Log any unhandled objects after filtering for debug purposes.
log.Debugf(ctx, "unhandled CREATE types: %v", typeNames(objects))
}
return errs.Combine()
}
// createPollOptionable handles a Create activity for a PollOptionable.
// This function doesn't handle database insertion, only validation checks
// before passing off to a worker for asynchronous processing.
func (f *federatingDB) createPollOptionables(
ctx context.Context,
receiver *gtsmodel.Account,
requester *gtsmodel.Account,
options []ap.PollOptionable,
) error {
var (
// the origin Status w/ Poll the vote
// options are in. This gets set on first
// iteration, relevant checks performed
// then re-used in each further iteration.
inReplyTo *gtsmodel.Status
// the resulting slices of Poll.Option
// choice indices passed into the new
// created PollVote object.
choices []int
)
for _, option := range options {
// Extract the "inReplyTo" property.
inReplyToURIs := ap.GetInReplyTo(option)
if len(inReplyToURIs) != 1 {
return gtserror.Newf("invalid inReplyTo property length: %d", len(inReplyToURIs))
}
// Stringify the inReplyTo URI.
statusURI := inReplyToURIs[0].String()
if inReplyTo == nil {
var err error
// This is the first object in the activity slice,
// check database for the poll source status by URI.
inReplyTo, err = f.state.DB.GetStatusByURI(ctx, statusURI)
if err != nil {
return gtserror.Newf("error getting poll source from database %s: %w", statusURI, err)
}
switch {
// The origin status isn't a poll?
case inReplyTo.PollID == "":
return gtserror.Newf("poll vote in status %s without poll", statusURI)
// We don't own the poll ...
case !*inReplyTo.Local:
return gtserror.Newf("poll vote in remote status %s", statusURI)
}
// Check whether user has already vote in this poll.
// (we only check this for the first object, as multiple
// may be sent in response to a multiple-choice poll).
vote, err := f.state.DB.GetPollVoteBy(
gtscontext.SetBarebones(ctx),
inReplyTo.PollID,
requester.ID,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return gtserror.Newf("error getting status %s poll votes from database: %w", statusURI, err)
}
if vote != nil {
log.Warnf(ctx, "%s has already voted in poll %s", requester.URI, statusURI)
return nil // this is a useful warning for admins to report to us from logs
}
}
if statusURI != inReplyTo.URI {
// All activity votes should be to the same poll per activity.
return gtserror.New("votes to multiple polls in single activity")
}
// Extract the poll option name.
name := ap.ExtractName(option)
// Check that this is a valid option name.
choice := inReplyTo.Poll.GetChoice(name)
if choice == -1 {
return gtserror.Newf("poll vote in status %s invalid: %s", statusURI, name)
}
// Append the option index to choices.
choices = append(choices, choice)
}
// Enqueue message to the fedi API worker with poll vote(s).
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APActivityType: ap.ActivityCreate,
APObjectType: ap.ActivityQuestion,
GTSModel: >smodel.PollVote{
ID: id.NewULID(),
Choices: choices,
AccountID: requester.ID,
Account: requester,
PollID: inReplyTo.PollID,
Poll: inReplyTo.Poll,
},
Receiving: receiver,
Requesting: requester,
})
return nil
}
// createStatusable handles a Create activity for a Statusable.
// This function won't insert anything in the database yet,
// but will pass the Statusable (if appropriate) through to
// the processor for further asynchronous processing.
func (f *federatingDB) createStatusable(
ctx context.Context,
receiver *gtsmodel.Account,
requester *gtsmodel.Account,
statusable ap.Statusable,
forwarded bool,
) error {
// Check whether this status is both
// relevant, and doesn't look like spam.
err := f.spamFilter.StatusableOK(ctx,
receiver,
requester,
statusable,
)
switch {
case err == nil:
// No problem!
case gtserror.IsNotRelevant(err):
// This case is quite common if a remote (Mastodon)
// instance forwards a message to us which is a reply
// from someone else to a status we've also replied to.
//
// It does this to try to ensure thread completion, but
// we have our own thread fetching mechanism anyway.
log.Debugf(ctx,
"status %s is not relevant to receiver (%v); dropping it",
ap.GetJSONLDId(statusable), err,
)
return nil
case gtserror.IsSpam(err):
// Log this at a higher level so admins can
// gauge how much spam is being sent to them.
//
// TODO: add Prometheus metrics for this.
log.Infof(ctx,
"status %s looked like spam (%v); dropping it",
ap.GetJSONLDId(statusable), err,
)
return nil
default:
// A real error has occurred.
return gtserror.Newf("error checking relevancy/spam: %w", err)
}
// If we do have a forward, we should ignore the content
// and instead deref based on the URI of the statusable.
//
// In other words, don't automatically trust whoever sent
// this status to us, but fetch the authentic article from
// the server it originated from.
if forwarded {
// Pass the statusable URI (APIri) into the processor
// worker and do the rest of the processing asynchronously.
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APObjectType: ap.ObjectNote,
APActivityType: ap.ActivityCreate,
APIRI: ap.GetJSONLDId(statusable),
APObject: nil,
GTSModel: nil,
Receiving: receiver,
Requesting: requester,
})
return nil
}
// Do the rest of the processing asynchronously. The processor
// will handle inserting/updating + further dereferencing the status.
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APObjectType: ap.ObjectNote,
APActivityType: ap.ActivityCreate,
APIRI: nil,
GTSModel: nil,
APObject: statusable,
Receiving: receiver,
Requesting: requester,
})
return nil
}
/*
FOLLOW HANDLERS
*/
func (f *federatingDB) activityFollow(ctx context.Context, asType vocab.Type, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account) error {
follow, ok := asType.(vocab.ActivityStreamsFollow)
if !ok {
return errors.New("activityFollow: could not convert type to follow")
}
followRequest, err := f.converter.ASFollowToFollowRequest(ctx, follow)
if err != nil {
return fmt.Errorf("activityFollow: could not convert Follow to follow request: %s", err)
}
if followRequest.AccountID != requestingAccount.ID {
return fmt.Errorf(
"activityFollow: requestingAccount %s is not Follow actor account %s",
requestingAccount.URI, followRequest.Account.URI,
)
}
if followRequest.TargetAccountID != receivingAccount.ID {
return fmt.Errorf(
"activityFollow: inbox account %s is not Follow object account %s",
receivingAccount.URI, followRequest.TargetAccount.URI,
)
}
followRequest.ID = id.NewULID()
if err := f.state.DB.PutFollowRequest(ctx, followRequest); err != nil {
return fmt.Errorf("activityFollow: database error inserting follow request: %s", err)
}
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APObjectType: ap.ActivityFollow,
APActivityType: ap.ActivityCreate,
GTSModel: followRequest,
Receiving: receivingAccount,
Requesting: requestingAccount,
})
return nil
}
/*
LIKE HANDLERS
*/
func (f *federatingDB) activityLike(ctx context.Context, asType vocab.Type, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account) error {
like, ok := asType.(vocab.ActivityStreamsLike)
if !ok {
return errors.New("activityLike: could not convert type to like")
}
fave, err := f.converter.ASLikeToFave(ctx, like)
if err != nil {
return fmt.Errorf("activityLike: could not convert Like to fave: %w", err)
}
if fave.AccountID != requestingAccount.ID {
return fmt.Errorf(
"activityLike: requestingAccount %s is not Like actor account %s",
requestingAccount.URI, fave.Account.URI,
)
}
fave.ID = id.NewULID()
if err := f.state.DB.PutStatusFave(ctx, fave); err != nil {
if errors.Is(err, db.ErrAlreadyExists) {
// The Like already exists in the database, which
// means we've already handled side effects. We can
// just return nil here and be done with it.
return nil
}
return fmt.Errorf("activityLike: database error inserting fave: %w", err)
}
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APObjectType: ap.ActivityLike,
APActivityType: ap.ActivityCreate,
GTSModel: fave,
Receiving: receivingAccount,
Requesting: requestingAccount,
})
return nil
}
/*
FLAG HANDLERS
*/
func (f *federatingDB) activityFlag(ctx context.Context, asType vocab.Type, receivingAccount *gtsmodel.Account, requestingAccount *gtsmodel.Account) error {
flag, ok := asType.(vocab.ActivityStreamsFlag)
if !ok {
return errors.New("activityFlag: could not convert type to flag")
}
report, err := f.converter.ASFlagToReport(ctx, flag)
if err != nil {
return fmt.Errorf("activityFlag: could not convert Flag to report: %w", err)
}
// Requesting account must have at
// least two domains from the right
// in common with reporting account.
if dns.CompareDomainName(
requestingAccount.Domain,
report.Account.Domain,
) < 2 {
return fmt.Errorf(
"activityFlag: requesting account %s does not share a domain with Flag Actor account %s",
requestingAccount.URI, report.Account.URI,
)
}
if report.TargetAccountID != receivingAccount.ID {
return fmt.Errorf(
"activityFlag: inbox account %s is not Flag object account %s",
receivingAccount.URI, report.TargetAccount.URI,
)
}
report.ID = id.NewULID()
if err := f.state.DB.PutReport(ctx, report); err != nil {
return fmt.Errorf("activityFlag: database error inserting report: %w", err)
}
f.state.Workers.Federator.Queue.Push(&messages.FromFediAPI{
APObjectType: ap.ActivityFlag,
APActivityType: ap.ActivityCreate,
GTSModel: report,
Receiving: receivingAccount,
Requesting: requestingAccount,
})
return nil
}