gotosocial/internal/federation/dereference.go
Tobi Smethurst 846057f0d6
Block/unblock (#96)
* remote + local block logic, incl. federation

* improve blocking stuff

* fiddle with display of blocked profiles

* go fmt
2021-07-11 16:22:21 +02:00

526 lines
19 KiB
Go

package federation
import (
"context"
"encoding/json"
"errors"
"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/id"
"github.com/superseriousbusiness/gotosocial/internal/transport"
"github.com/superseriousbusiness/gotosocial/internal/typeutils"
)
func (f *federator) DereferenceRemoteAccount(username string, remoteAccountID *url.URL) (typeutils.Accountable, error) {
f.startHandshake(username, remoteAccountID)
defer f.stopHandshake(username, remoteAccountID)
if blocked, err := f.blockedDomain(remoteAccountID.Host); blocked || err != nil {
return nil, fmt.Errorf("DereferenceRemoteAccount: domain %s is blocked", remoteAccountID.Host)
}
transport, err := f.GetTransportForUser(username)
if err != nil {
return nil, fmt.Errorf("transport err: %s", err)
}
b, err := transport.Dereference(context.Background(), remoteAccountID)
if err != nil {
return nil, fmt.Errorf("error deferencing %s: %s", remoteAccountID.String(), err)
}
m := make(map[string]interface{})
if err := json.Unmarshal(b, &m); err != nil {
return nil, fmt.Errorf("error unmarshalling bytes into json: %s", err)
}
t, err := streams.ToType(context.Background(), m)
if err != nil {
return nil, fmt.Errorf("error resolving json into ap vocab type: %s", err)
}
switch t.GetTypeName() {
case string(gtsmodel.ActivityStreamsPerson):
p, ok := t.(vocab.ActivityStreamsPerson)
if !ok {
return nil, errors.New("error resolving type as activitystreams person")
}
return p, nil
case string(gtsmodel.ActivityStreamsApplication):
p, ok := t.(vocab.ActivityStreamsApplication)
if !ok {
return nil, errors.New("error resolving type as activitystreams application")
}
return p, nil
case string(gtsmodel.ActivityStreamsService):
p, ok := t.(vocab.ActivityStreamsService)
if !ok {
return nil, errors.New("error resolving type as activitystreams service")
}
return p, nil
}
return nil, fmt.Errorf("type name %s not supported", t.GetTypeName())
}
func (f *federator) DereferenceRemoteStatus(username string, remoteStatusID *url.URL) (typeutils.Statusable, error) {
if blocked, err := f.blockedDomain(remoteStatusID.Host); blocked || err != nil {
return nil, fmt.Errorf("DereferenceRemoteStatus: domain %s is blocked", remoteStatusID.Host)
}
transport, err := f.GetTransportForUser(username)
if err != nil {
return nil, fmt.Errorf("transport err: %s", err)
}
b, err := transport.Dereference(context.Background(), remoteStatusID)
if err != nil {
return nil, fmt.Errorf("error deferencing %s: %s", remoteStatusID.String(), err)
}
m := make(map[string]interface{})
if err := json.Unmarshal(b, &m); err != nil {
return nil, fmt.Errorf("error unmarshalling bytes into json: %s", err)
}
t, err := streams.ToType(context.Background(), m)
if err != nil {
return nil, fmt.Errorf("error resolving json into ap vocab type: %s", err)
}
// Article, Document, Image, Video, Note, Page, Event, Place, Mention, Profile
switch t.GetTypeName() {
case gtsmodel.ActivityStreamsArticle:
p, ok := t.(vocab.ActivityStreamsArticle)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsArticle")
}
return p, nil
case gtsmodel.ActivityStreamsDocument:
p, ok := t.(vocab.ActivityStreamsDocument)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsDocument")
}
return p, nil
case gtsmodel.ActivityStreamsImage:
p, ok := t.(vocab.ActivityStreamsImage)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsImage")
}
return p, nil
case gtsmodel.ActivityStreamsVideo:
p, ok := t.(vocab.ActivityStreamsVideo)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsVideo")
}
return p, nil
case gtsmodel.ActivityStreamsNote:
p, ok := t.(vocab.ActivityStreamsNote)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsNote")
}
return p, nil
case gtsmodel.ActivityStreamsPage:
p, ok := t.(vocab.ActivityStreamsPage)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsPage")
}
return p, nil
case gtsmodel.ActivityStreamsEvent:
p, ok := t.(vocab.ActivityStreamsEvent)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsEvent")
}
return p, nil
case gtsmodel.ActivityStreamsPlace:
p, ok := t.(vocab.ActivityStreamsPlace)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsPlace")
}
return p, nil
case gtsmodel.ActivityStreamsProfile:
p, ok := t.(vocab.ActivityStreamsProfile)
if !ok {
return nil, errors.New("error resolving type as ActivityStreamsProfile")
}
return p, nil
}
return nil, fmt.Errorf("type name %s not supported", t.GetTypeName())
}
func (f *federator) DereferenceRemoteInstance(username string, remoteInstanceURI *url.URL) (*gtsmodel.Instance, error) {
if blocked, err := f.blockedDomain(remoteInstanceURI.Host); blocked || err != nil {
return nil, fmt.Errorf("DereferenceRemoteInstance: domain %s is blocked", remoteInstanceURI.Host)
}
transport, err := f.GetTransportForUser(username)
if err != nil {
return nil, fmt.Errorf("transport err: %s", err)
}
return transport.DereferenceInstance(context.Background(), remoteInstanceURI)
}
// dereferenceStatusFields fetches all the information we temporarily pinned to an incoming
// federated status, back in the federating db's Create function.
//
// When a status comes in from the federation API, there are certain fields that
// haven't been dereferenced yet, because we needed to provide a snappy synchronous
// response to the caller. By the time it reaches this function though, it's being
// processed asynchronously, so we have all the time in the world to fetch the various
// bits and bobs that are attached to the status, and properly flesh it out, before we
// send the status to any timelines and notify people.
//
// Things to dereference and fetch here:
//
// 1. Media attachments.
// 2. Hashtags.
// 3. Emojis.
// 4. Mentions.
// 5. Posting account.
// 6. Replied-to-status.
//
// SIDE EFFECTS:
// This function will deference all of the above, insert them in the database as necessary,
// and attach them to the status. The status itself will not be added to the database yet,
// that's up the caller to do.
func (f *federator) DereferenceStatusFields(status *gtsmodel.Status, requestingUsername string) error {
l := f.log.WithFields(logrus.Fields{
"func": "dereferenceStatusFields",
"status": fmt.Sprintf("%+v", status),
})
l.Debug("entering function")
statusURI, err := url.Parse(status.URI)
if err != nil {
return fmt.Errorf("DereferenceStatusFields: couldn't parse status URI %s: %s", status.URI, err)
}
if blocked, err := f.blockedDomain(statusURI.Host); blocked || err != nil {
return fmt.Errorf("DereferenceStatusFields: domain %s is blocked", statusURI.Host)
}
t, err := f.GetTransportForUser(requestingUsername)
if err != nil {
return fmt.Errorf("error creating transport: %s", err)
}
// the status should have an ID by now, but just in case it doesn't let's generate one here
// because we'll need it further down
if status.ID == "" {
newID, err := id.NewULIDFromTime(status.CreatedAt)
if err != nil {
return err
}
status.ID = newID
}
// 1. Media attachments.
//
// At this point we should know:
// * the media type of the file we're looking for (a.File.ContentType)
// * the blurhash (a.Blurhash)
// * the file type (a.Type)
// * the remote URL (a.RemoteURL)
// This should be enough to pass along to the media processor.
attachmentIDs := []string{}
for _, a := range status.GTSMediaAttachments {
l.Debugf("dereferencing attachment: %+v", a)
// it might have been processed elsewhere so check first if it's already in the database or not
maybeAttachment := &gtsmodel.MediaAttachment{}
err := f.db.GetWhere([]db.Where{{Key: "remote_url", Value: a.RemoteURL}}, maybeAttachment)
if err == nil {
// we already have it in the db, dereferenced, no need to do it again
l.Debugf("attachment already exists with id %s", maybeAttachment.ID)
attachmentIDs = append(attachmentIDs, maybeAttachment.ID)
continue
}
if _, ok := err.(db.ErrNoEntries); !ok {
// we have a real error
return fmt.Errorf("error checking db for existence of attachment with remote url %s: %s", a.RemoteURL, err)
}
// it just doesn't exist yet so carry on
l.Debug("attachment doesn't exist yet, calling ProcessRemoteAttachment", a)
deferencedAttachment, err := f.mediaHandler.ProcessRemoteAttachment(t, a, status.AccountID)
if err != nil {
l.Errorf("error dereferencing status attachment: %s", err)
continue
}
l.Debugf("dereferenced attachment: %+v", deferencedAttachment)
deferencedAttachment.StatusID = status.ID
deferencedAttachment.Description = a.Description
if err := f.db.Put(deferencedAttachment); err != nil {
return fmt.Errorf("error inserting dereferenced attachment with remote url %s: %s", a.RemoteURL, err)
}
attachmentIDs = append(attachmentIDs, deferencedAttachment.ID)
}
status.Attachments = attachmentIDs
// 2. Hashtags
// 3. Emojis
// 4. Mentions
// At this point, mentions should have the namestring and mentionedAccountURI set on them.
//
// We should dereference any accounts mentioned here which we don't have in our db yet, by their URI.
mentions := []string{}
for _, m := range status.GTSMentions {
if m.ID == "" {
mID, err := id.NewRandomULID()
if err != nil {
return err
}
m.ID = mID
}
uri, err := url.Parse(m.MentionedAccountURI)
if err != nil {
l.Debugf("error parsing mentioned account uri %s: %s", m.MentionedAccountURI, err)
continue
}
m.StatusID = status.ID
m.OriginAccountID = status.GTSAuthorAccount.ID
m.OriginAccountURI = status.GTSAuthorAccount.URI
targetAccount := &gtsmodel.Account{}
if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: uri.String()}}, targetAccount); err != nil {
// proper error
if _, ok := err.(db.ErrNoEntries); !ok {
return fmt.Errorf("db error checking for account with uri %s", uri.String())
}
// we just don't have it yet, so we should go get it....
accountable, err := f.DereferenceRemoteAccount(requestingUsername, uri)
if err != nil {
// we can't dereference it so just skip it
l.Debugf("error dereferencing remote account with uri %s: %s", uri.String(), err)
continue
}
targetAccount, err = f.typeConverter.ASRepresentationToAccount(accountable, false)
if err != nil {
l.Debugf("error converting remote account with uri %s into gts model: %s", uri.String(), err)
continue
}
targetAccountID, err := id.NewRandomULID()
if err != nil {
return err
}
targetAccount.ID = targetAccountID
if err := f.db.Put(targetAccount); err != nil {
return fmt.Errorf("db error inserting account with uri %s", uri.String())
}
}
// by this point, we know the targetAccount exists in our database with an ID :)
m.TargetAccountID = targetAccount.ID
if err := f.db.Put(m); err != nil {
return fmt.Errorf("error creating mention: %s", err)
}
mentions = append(mentions, m.ID)
}
status.Mentions = mentions
return nil
}
func (f *federator) DereferenceAccountFields(account *gtsmodel.Account, requestingUsername string, refresh bool) error {
l := f.log.WithFields(logrus.Fields{
"func": "dereferenceAccountFields",
"requestingUsername": requestingUsername,
})
accountURI, err := url.Parse(account.URI)
if err != nil {
return fmt.Errorf("DereferenceAccountFields: couldn't parse account URI %s: %s", account.URI, err)
}
if blocked, err := f.blockedDomain(accountURI.Host); blocked || err != nil {
return fmt.Errorf("DereferenceAccountFields: domain %s is blocked", accountURI.Host)
}
t, err := f.GetTransportForUser(requestingUsername)
if err != nil {
return fmt.Errorf("error getting transport for user: %s", err)
}
// fetch the header and avatar
if err := f.fetchHeaderAndAviForAccount(account, t, refresh); err != nil {
// if this doesn't work, just skip it -- we can do it later
l.Debugf("error fetching header/avi for account: %s", err)
}
if err := f.db.UpdateByID(account.ID, account); err != nil {
return fmt.Errorf("error updating account in database: %s", err)
}
return nil
}
func (f *federator) DereferenceAnnounce(announce *gtsmodel.Status, requestingUsername string) error {
if announce.GTSBoostedStatus == nil || announce.GTSBoostedStatus.URI == "" {
// we can't do anything unfortunately
return errors.New("DereferenceAnnounce: no URI to dereference")
}
boostedStatusURI, err := url.Parse(announce.GTSBoostedStatus.URI)
if err != nil {
return fmt.Errorf("DereferenceAnnounce: couldn't parse boosted status URI %s: %s", announce.GTSBoostedStatus.URI, err)
}
if blocked, err := f.blockedDomain(boostedStatusURI.Host); blocked || err != nil {
return fmt.Errorf("DereferenceAnnounce: domain %s is blocked", boostedStatusURI.Host)
}
// check if we already have the boosted status in the database
boostedStatus := &gtsmodel.Status{}
err = f.db.GetWhere([]db.Where{{Key: "uri", Value: announce.GTSBoostedStatus.URI}}, boostedStatus)
if err == nil {
// nice, we already have it so we don't actually need to dereference it from remote
announce.Content = boostedStatus.Content
announce.ContentWarning = boostedStatus.ContentWarning
announce.ActivityStreamsType = boostedStatus.ActivityStreamsType
announce.Sensitive = boostedStatus.Sensitive
announce.Language = boostedStatus.Language
announce.Text = boostedStatus.Text
announce.BoostOfID = boostedStatus.ID
announce.BoostOfAccountID = boostedStatus.AccountID
announce.Visibility = boostedStatus.Visibility
announce.VisibilityAdvanced = boostedStatus.VisibilityAdvanced
announce.GTSBoostedStatus = boostedStatus
return nil
}
// we don't have it so we need to dereference it
statusable, err := f.DereferenceRemoteStatus(requestingUsername, boostedStatusURI)
if err != nil {
return fmt.Errorf("dereferenceAnnounce: error dereferencing remote status with id %s: %s", announce.GTSBoostedStatus.URI, err)
}
// make sure we have the author account in the db
attributedToProp := statusable.GetActivityStreamsAttributedTo()
for iter := attributedToProp.Begin(); iter != attributedToProp.End(); iter = iter.Next() {
accountURI := iter.GetIRI()
if accountURI == nil {
continue
}
if err := f.db.GetWhere([]db.Where{{Key: "uri", Value: accountURI.String()}}, &gtsmodel.Account{}); err == nil {
// we already have it, fine
continue
}
// we don't have the boosted status author account yet so dereference it
accountable, err := f.DereferenceRemoteAccount(requestingUsername, accountURI)
if err != nil {
return fmt.Errorf("dereferenceAnnounce: error dereferencing remote account with id %s: %s", accountURI.String(), err)
}
account, err := f.typeConverter.ASRepresentationToAccount(accountable, false)
if err != nil {
return fmt.Errorf("dereferenceAnnounce: error converting dereferenced account with id %s into account : %s", accountURI.String(), err)
}
accountID, err := id.NewRandomULID()
if err != nil {
return err
}
account.ID = accountID
if err := f.db.Put(account); err != nil {
return fmt.Errorf("dereferenceAnnounce: error putting dereferenced account with id %s into database : %s", accountURI.String(), err)
}
if err := f.DereferenceAccountFields(account, requestingUsername, false); err != nil {
return fmt.Errorf("dereferenceAnnounce: error dereferencing fields on account with id %s : %s", accountURI.String(), err)
}
}
// now convert the statusable into something we can understand
boostedStatus, err = f.typeConverter.ASStatusToStatus(statusable)
if err != nil {
return fmt.Errorf("dereferenceAnnounce: error converting dereferenced statusable with id %s into status : %s", announce.GTSBoostedStatus.URI, err)
}
boostedStatusID, err := id.NewULIDFromTime(boostedStatus.CreatedAt)
if err != nil {
return nil
}
boostedStatus.ID = boostedStatusID
if err := f.db.Put(boostedStatus); err != nil {
return fmt.Errorf("dereferenceAnnounce: error putting dereferenced status with id %s into the db: %s", announce.GTSBoostedStatus.URI, err)
}
// now dereference additional fields straight away (we're already async here so we have time)
if err := f.DereferenceStatusFields(boostedStatus, requestingUsername); err != nil {
return fmt.Errorf("dereferenceAnnounce: error dereferencing status fields for status with id %s: %s", announce.GTSBoostedStatus.URI, err)
}
// update with the newly dereferenced fields
if err := f.db.UpdateByID(boostedStatus.ID, boostedStatus); err != nil {
return fmt.Errorf("dereferenceAnnounce: error updating dereferenced status in the db: %s", err)
}
// we have everything we need!
announce.Content = boostedStatus.Content
announce.ContentWarning = boostedStatus.ContentWarning
announce.ActivityStreamsType = boostedStatus.ActivityStreamsType
announce.Sensitive = boostedStatus.Sensitive
announce.Language = boostedStatus.Language
announce.Text = boostedStatus.Text
announce.BoostOfID = boostedStatus.ID
announce.BoostOfAccountID = boostedStatus.AccountID
announce.Visibility = boostedStatus.Visibility
announce.VisibilityAdvanced = boostedStatus.VisibilityAdvanced
announce.GTSBoostedStatus = boostedStatus
return nil
}
// fetchHeaderAndAviForAccount fetches the header and avatar for a remote account, using a transport
// on behalf of requestingUsername.
//
// targetAccount's AvatarMediaAttachmentID and HeaderMediaAttachmentID will be updated as necessary.
//
// SIDE EFFECTS: remote header and avatar will be stored in local storage, and the database will be updated
// to reflect the creation of these new attachments.
func (f *federator) fetchHeaderAndAviForAccount(targetAccount *gtsmodel.Account, t transport.Transport, refresh bool) error {
accountURI, err := url.Parse(targetAccount.URI)
if err != nil {
return fmt.Errorf("fetchHeaderAndAviForAccount: couldn't parse account URI %s: %s", targetAccount.URI, err)
}
if blocked, err := f.blockedDomain(accountURI.Host); blocked || err != nil {
return fmt.Errorf("fetchHeaderAndAviForAccount: domain %s is blocked", accountURI.Host)
}
if targetAccount.AvatarRemoteURL != "" && (targetAccount.AvatarMediaAttachmentID == "" || refresh) {
a, err := f.mediaHandler.ProcessRemoteHeaderOrAvatar(t, &gtsmodel.MediaAttachment{
RemoteURL: targetAccount.AvatarRemoteURL,
Avatar: true,
}, targetAccount.ID)
if err != nil {
return fmt.Errorf("error processing avatar for user: %s", err)
}
targetAccount.AvatarMediaAttachmentID = a.ID
}
if targetAccount.HeaderRemoteURL != "" && (targetAccount.HeaderMediaAttachmentID == "" || refresh) {
a, err := f.mediaHandler.ProcessRemoteHeaderOrAvatar(t, &gtsmodel.MediaAttachment{
RemoteURL: targetAccount.HeaderRemoteURL,
Header: true,
}, targetAccount.ID)
if err != nil {
return fmt.Errorf("error processing header for user: %s", err)
}
targetAccount.HeaderMediaAttachmentID = a.ID
}
return nil
}