gotosocial/internal/federation/dereferencing/status.go

485 lines
16 KiB
Go

// 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 dereferencing
import (
"context"
"errors"
"io"
"net/url"
"time"
"github.com/superseriousbusiness/gotosocial/internal/ap"
"github.com/superseriousbusiness/gotosocial/internal/config"
"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/media"
"github.com/superseriousbusiness/gotosocial/internal/transport"
)
// statusUpToDate returns whether the given status model is both updateable
// (i.e. remote status) and whether it needs an update based on `fetched_at`.
func statusUpToDate(status *gtsmodel.Status) bool {
if *status.Local {
// Can't update local statuses.
return true
}
// If this status was updated recently (last interval), we return as-is.
if next := status.FetchedAt.Add(2 * time.Hour); time.Now().Before(next) {
return true
}
return false
}
// GetStatus: implements Dereferencer{}.GetStatus().
func (d *deref) GetStatusByURI(ctx context.Context, requestUser string, uri *url.URL) (*gtsmodel.Status, ap.Statusable, error) {
// Fetch and dereference status if necessary.
status, apubStatus, err := d.getStatusByURI(ctx,
requestUser,
uri,
)
if err != nil {
return nil, nil, err
}
if apubStatus != nil {
// This status was updated, enqueue re-dereferencing the whole thread.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
d.dereferenceThread(ctx, requestUser, uri, status, apubStatus)
})
}
return status, apubStatus, nil
}
// getStatusByURI is a package internal form of .GetStatusByURI() that doesn't bother dereferencing the whole thread on update.
func (d *deref) getStatusByURI(ctx context.Context, requestUser string, uri *url.URL) (*gtsmodel.Status, ap.Statusable, error) {
var (
status *gtsmodel.Status
uriStr = uri.String()
err error
)
// Search the database for existing status with URI.
status, err = d.state.DB.GetStatusByURI(
// request a barebones object, it may be in the
// db but with related models not yet dereferenced.
gtscontext.SetBarebones(ctx),
uriStr,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("error checking database for status %s by uri: %w", uriStr, err)
}
if status == nil {
// Else, search the database for existing by URL.
status, err = d.state.DB.GetStatusByURL(
gtscontext.SetBarebones(ctx),
uriStr,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("error checking database for status %s by url: %w", uriStr, err)
}
}
if status == nil {
// Ensure that this isn't a search for a local status.
if uri.Host == config.GetHost() || uri.Host == config.GetAccountDomain() {
return nil, nil, gtserror.SetUnretrievable(err) // this will be db.ErrNoEntries
}
// Create and pass-through a new bare-bones model for deref.
return d.enrichStatus(ctx, requestUser, uri, &gtsmodel.Status{
Local: func() *bool { var false bool; return &false }(),
URI: uriStr,
}, nil)
}
// Check whether needs update.
if statusUpToDate(status) {
// This is existing up-to-date status, ensure it is populated.
if err := d.state.DB.PopulateStatus(ctx, status); err != nil {
log.Errorf(ctx, "error populating existing status: %v", err)
}
return status, nil, nil
}
// Try to update + deref existing status model.
latest, apubStatus, err := d.enrichStatus(ctx,
requestUser,
uri,
status,
nil,
)
if err != nil {
log.Errorf(ctx, "error enriching remote status: %v", err)
// Update fetch-at to slow re-attempts.
status.FetchedAt = time.Now()
_ = d.state.DB.UpdateStatus(ctx, status, "fetched_at")
// Fallback to existing.
return status, nil, nil
}
return latest, apubStatus, nil
}
// RefreshStatus: implements Dereferencer{}.RefreshStatus().
func (d *deref) RefreshStatus(ctx context.Context, requestUser string, status *gtsmodel.Status, apubStatus ap.Statusable, force bool) (*gtsmodel.Status, ap.Statusable, error) {
// Check whether needs update.
if !force && statusUpToDate(status) {
return status, nil, nil
}
// Parse the URI from status.
uri, err := url.Parse(status.URI)
if err != nil {
return nil, nil, gtserror.Newf("invalid status uri %q: %w", status.URI, err)
}
// Try to update + deref existing status model.
latest, apubStatus, err := d.enrichStatus(ctx,
requestUser,
uri,
status,
apubStatus,
)
if err != nil {
return nil, nil, err
}
// This status was updated, enqueue re-dereferencing the whole thread.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
d.dereferenceThread(ctx, requestUser, uri, latest, apubStatus)
})
return latest, apubStatus, nil
}
// RefreshStatusAsync: implements Dereferencer{}.RefreshStatusAsync().
func (d *deref) RefreshStatusAsync(ctx context.Context, requestUser string, status *gtsmodel.Status, apubStatus ap.Statusable, force bool) {
// Check whether needs update.
if statusUpToDate(status) {
return
}
// Parse the URI from status.
uri, err := url.Parse(status.URI)
if err != nil {
log.Errorf(ctx, "invalid status uri %q: %v", status.URI, err)
return
}
// Enqueue a worker function to re-fetch this status async.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
latest, apubStatus, err := d.enrichStatus(ctx, requestUser, uri, status, apubStatus)
if err != nil {
log.Errorf(ctx, "error enriching remote status: %v", err)
return
}
// This status was updated, re-dereference the whole thread.
d.dereferenceThread(ctx, requestUser, uri, latest, apubStatus)
})
}
// enrichStatus will enrich the given status, whether a new
// barebones model, or existing model from the database.
// It handles necessary dereferencing, database updates, etc.
func (d *deref) enrichStatus(
ctx context.Context,
requestUser string,
uri *url.URL,
status *gtsmodel.Status,
apubStatus ap.Statusable,
) (*gtsmodel.Status, ap.Statusable, error) {
// Pre-fetch a transport for requesting username, used by later dereferencing.
tsport, err := d.transportController.NewTransportForUsername(ctx, requestUser)
if err != nil {
return nil, nil, gtserror.Newf("couldn't create transport: %w", err)
}
// Check whether this account URI is a blocked domain / subdomain.
if blocked, err := d.state.DB.IsDomainBlocked(ctx, uri.Host); err != nil {
return nil, nil, gtserror.Newf("error checking blocked domain: %w", err)
} else if blocked {
err = gtserror.Newf("%s is blocked", uri.Host)
return nil, nil, gtserror.SetUnretrievable(err)
}
if apubStatus == nil {
// Dereference latest version of the status.
b, err := tsport.Dereference(ctx, uri)
if err != nil {
err := gtserror.Newf("error deferencing %s: %w", uri, err)
return nil, nil, gtserror.SetUnretrievable(err)
}
// Attempt to resolve ActivityPub status from data.
apubStatus, err = ap.ResolveStatusable(ctx, b)
if err != nil {
return nil, nil, gtserror.Newf("error resolving statusable from data for account %s: %w", uri, err)
}
}
// Get the attributed-to account in order to fetch profile.
attributedTo, err := ap.ExtractAttributedToURI(apubStatus)
if err != nil {
return nil, nil, gtserror.New("attributedTo was empty")
}
// Ensure we have the author account of the status dereferenced (+ up-to-date).
if author, _, err := d.getAccountByURI(ctx, requestUser, attributedTo); err != nil {
if status.AccountID == "" {
// Provided status account is nil, i.e. this is a new status / author, so a deref fail is unrecoverable.
return nil, nil, gtserror.Newf("failed to dereference status author %s: %w", uri, err)
}
} else if status.AccountID != "" && status.AccountID != author.ID {
// There already existed an account for this status author, but account ID changed. This shouldn't happen!
log.Warnf(ctx, "status author account ID changed: old=%s new=%s", status.AccountID, author.ID)
}
// ActivityPub model was recently dereferenced, so assume that passed status
// may contain out-of-date information, convert AP model to our GTS model.
latestStatus, err := d.typeConverter.ASStatusToStatus(ctx, apubStatus)
if err != nil {
return nil, nil, gtserror.Newf("error converting statusable to gts model for status %s: %w", uri, err)
}
// Use existing status ID.
latestStatus.ID = status.ID
if latestStatus.ID == "" {
// Generate new status ID from the provided creation date.
latestStatus.ID, err = id.NewULIDFromTime(latestStatus.CreatedAt)
if err != nil {
return nil, nil, gtserror.Newf("invalid created at date: %w", err)
}
}
// Carry-over values and set fetch time.
latestStatus.FetchedAt = time.Now()
latestStatus.Local = status.Local
// Ensure the status' mentions are populated, and pass in existing to check for changes.
if err := d.fetchStatusMentions(ctx, requestUser, status, latestStatus); err != nil {
return nil, nil, gtserror.Newf("error populating mentions for status %s: %w", uri, err)
}
// TODO: populateStatusTags()
// Ensure the status' media attachments are populated, passing in existing to check for changes.
if err := d.fetchStatusAttachments(ctx, tsport, status, latestStatus); err != nil {
return nil, nil, gtserror.Newf("error populating attachments for status %s: %w", uri, err)
}
// Ensure the status' emoji attachments are populated, passing in existing to check for changes.
if err := d.fetchStatusEmojis(ctx, requestUser, status, latestStatus); err != nil {
return nil, nil, gtserror.Newf("error populating emojis for status %s: %w", uri, err)
}
if status.CreatedAt.IsZero() {
// CreatedAt will be zero if no local copy was
// found in one of the GetStatusBy___() functions.
//
// This is new, put the status in the database.
err := d.state.DB.PutStatus(ctx, latestStatus)
if errors.Is(err, db.ErrAlreadyExists) {
// TODO: replace this quick fix with per-URI deref locks.
latestStatus, err = d.state.DB.GetStatusByURI(ctx, latestStatus.URI)
return latestStatus, nil, err
}
if err != nil {
return nil, nil, gtserror.Newf("error putting in database: %w", err)
}
} else {
// This is an existing status, update the model in the database.
if err := d.state.DB.UpdateStatus(ctx, latestStatus); err != nil {
return nil, nil, gtserror.Newf("error updating database: %w", err)
}
}
return latestStatus, apubStatus, nil
}
func (d *deref) fetchStatusMentions(ctx context.Context, requestUser string, existing, status *gtsmodel.Status) error {
// Allocate new slice to take the yet-to-be created mention IDs.
status.MentionIDs = make([]string, len(status.Mentions))
for i := range status.Mentions {
mention := status.Mentions[i]
// Look for existing mention with target account URI first.
existing, ok := existing.GetMentionByTargetURI(mention.TargetAccountURI)
if ok && existing.ID != "" {
status.Mentions[i] = existing
status.MentionIDs[i] = existing.ID
continue
}
// Ensure that mention account URI is parseable.
accountURI, err := url.Parse(mention.TargetAccountURI)
if err != nil {
log.Errorf(ctx, "invalid account uri %q: %v", mention.TargetAccountURI, err)
continue
}
// Ensure we have the account of the mention target dereferenced.
mention.TargetAccount, _, err = d.getAccountByURI(ctx, requestUser, accountURI)
if err != nil {
log.Errorf(ctx, "failed to dereference account %s: %v", accountURI, err)
continue
}
// Generate new ID according to status creation.
mention.ID, err = id.NewULIDFromTime(status.CreatedAt)
if err != nil {
log.Errorf(ctx, "invalid created at date: %v", err)
mention.ID = id.NewULID() // just use "now"
}
// Set known further mention details.
mention.CreatedAt = status.CreatedAt
mention.UpdatedAt = status.UpdatedAt
mention.OriginAccount = status.Account
mention.OriginAccountID = status.AccountID
mention.OriginAccountURI = status.AccountURI
mention.TargetAccountID = mention.TargetAccount.ID
mention.TargetAccountURI = mention.TargetAccount.URI
mention.TargetAccountURL = mention.TargetAccount.URL
mention.StatusID = status.ID
mention.Status = status
// Place the new mention into the database.
if err := d.state.DB.PutMention(ctx, mention); err != nil {
return gtserror.Newf("error putting mention in database: %w", err)
}
// Set the *new* mention and ID.
status.Mentions[i] = mention
status.MentionIDs[i] = mention.ID
}
for i := 0; i < len(status.MentionIDs); {
if status.MentionIDs[i] == "" {
// This is a failed mention population, likely due
// to invalid incoming data / now-deleted accounts.
copy(status.Mentions[i:], status.Mentions[i+1:])
copy(status.MentionIDs[i:], status.MentionIDs[i+1:])
status.Mentions = status.Mentions[:len(status.Mentions)-1]
status.MentionIDs = status.MentionIDs[:len(status.MentionIDs)-1]
continue
}
i++
}
return nil
}
func (d *deref) fetchStatusAttachments(ctx context.Context, tsport transport.Transport, existing, status *gtsmodel.Status) error {
// Allocate new slice to take the yet-to-be fetched attachment IDs.
status.AttachmentIDs = make([]string, len(status.Attachments))
for i := range status.Attachments {
placeholder := status.Attachments[i]
// Look for existing media attachment with remoet URL first.
existing, ok := existing.GetAttachmentByRemoteURL(placeholder.RemoteURL)
if ok && existing.ID != "" && *existing.Cached {
status.Attachments[i] = existing
status.AttachmentIDs[i] = existing.ID
continue
}
// Ensure a valid media attachment remote URL.
remoteURL, err := url.Parse(placeholder.RemoteURL)
if err != nil {
log.Errorf(ctx, "invalid remote media url %q: %v", placeholder.RemoteURL, err)
continue
}
// Start pre-processing remote media at remote URL.
processing, err := d.mediaManager.PreProcessMedia(ctx, func(ctx context.Context) (io.ReadCloser, int64, error) {
return tsport.DereferenceMedia(ctx, remoteURL)
}, status.AccountID, &media.AdditionalMediaInfo{
StatusID: &status.ID,
RemoteURL: &placeholder.RemoteURL,
Description: &placeholder.Description,
Blurhash: &placeholder.Blurhash,
})
if err != nil {
log.Errorf(ctx, "error processing attachment: %v", err)
continue
}
// Force attachment loading *right now*.
media, err := processing.LoadAttachment(ctx)
if err != nil {
log.Errorf(ctx, "error loading attachment: %v", err)
continue
}
// Set the *new* attachment and ID.
status.Attachments[i] = media
status.AttachmentIDs[i] = media.ID
}
for i := 0; i < len(status.AttachmentIDs); {
if status.AttachmentIDs[i] == "" {
// This is a failed attachment population, this may
// be due to us not currently supporting a media type.
copy(status.Attachments[i:], status.Attachments[i+1:])
copy(status.AttachmentIDs[i:], status.AttachmentIDs[i+1:])
status.Attachments = status.Attachments[:len(status.Attachments)-1]
status.AttachmentIDs = status.AttachmentIDs[:len(status.AttachmentIDs)-1]
continue
}
i++
}
return nil
}
func (d *deref) fetchStatusEmojis(ctx context.Context, requestUser string, existing, status *gtsmodel.Status) error {
// Fetch the full-fleshed-out emoji objects for our status.
emojis, err := d.populateEmojis(ctx, status.Emojis, requestUser)
if err != nil {
return gtserror.Newf("failed to populate emojis: %w", err)
}
// Iterate over and get their IDs.
emojiIDs := make([]string, 0, len(emojis))
for _, e := range emojis {
emojiIDs = append(emojiIDs, e.ID)
}
// Set known emoji details.
status.Emojis = emojis
status.EmojiIDs = emojiIDs
return nil
}