gotosocial/internal/federation/dereferencing/account.go

890 lines
29 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"
"encoding/json"
"errors"
"io"
"net/url"
"time"
"github.com/superseriousbusiness/activity/streams"
"github.com/superseriousbusiness/activity/streams/vocab"
"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"
)
// accountUpToDate returns whether the given account model is both updateable (i.e.
// non-instance remote account) and whether it needs an update based on `fetched_at`.
func accountUpToDate(account *gtsmodel.Account) bool {
if account.IsLocal() {
// Can't update local accounts.
return true
}
if !account.CreatedAt.IsZero() && account.IsInstance() {
// Existing instance account. No need for update.
return true
}
// If this account was updated recently (last interval), we return as-is.
if next := account.FetchedAt.Add(6 * time.Hour); time.Now().Before(next) {
return true
}
return false
}
// GetAccountByURI: implements Dereferencer{}.GetAccountByURI.
func (d *deref) GetAccountByURI(ctx context.Context, requestUser string, uri *url.URL) (*gtsmodel.Account, ap.Accountable, error) {
// Fetch and dereference account if necessary.
account, apubAcc, err := d.getAccountByURI(ctx,
requestUser,
uri,
)
if err != nil {
return nil, nil, err
}
if apubAcc != nil {
// This account was updated, enqueue re-dereference featured posts.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
if err := d.dereferenceAccountFeatured(ctx, requestUser, account); err != nil {
log.Errorf(ctx, "error fetching account featured collection: %v", err)
}
})
}
return account, apubAcc, nil
}
// getAccountByURI is a package internal form of .GetAccountByURI() that doesn't bother dereferencing featured posts on update.
func (d *deref) getAccountByURI(ctx context.Context, requestUser string, uri *url.URL) (*gtsmodel.Account, ap.Accountable, error) {
var (
account *gtsmodel.Account
uriStr = uri.String()
err error
)
// Search the database for existing account with URI.
account, err = d.state.DB.GetAccountByURI(
// 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 account %s by uri: %w", uriStr, err)
}
if account == nil {
// Else, search the database for existing by URL.
account, err = d.state.DB.GetAccountByURL(
gtscontext.SetBarebones(ctx),
uriStr,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("error checking database for account %s by url: %w", uriStr, err)
}
}
if account == nil {
// Ensure that this is isn't a search for a local account.
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 dereferencing.
return d.enrichAccount(ctx, requestUser, uri, &gtsmodel.Account{
ID: id.NewULID(),
Domain: uri.Host,
URI: uriStr,
}, nil)
}
// Check whether needs update.
if accountUpToDate(account) {
// This is existing up-to-date account, ensure it is populated.
if err := d.state.DB.PopulateAccount(ctx, account); err != nil {
log.Errorf(ctx, "error populating existing account: %v", err)
}
return account, nil, nil
}
// Try to update existing account model.
latest, apubAcc, err := d.enrichAccount(ctx,
requestUser,
uri,
account,
nil,
)
if err != nil {
log.Errorf(ctx, "error enriching remote account: %v", err)
// Update fetch-at to slow re-attempts.
account.FetchedAt = time.Now()
_ = d.state.DB.UpdateAccount(ctx, account, "fetched_at")
// Fallback to existing.
return account, nil, nil
}
return latest, apubAcc, nil
}
// GetAccountByUsernameDomain: implements Dereferencer{}.GetAccountByUsernameDomain.
func (d *deref) GetAccountByUsernameDomain(ctx context.Context, requestUser string, username string, domain string) (*gtsmodel.Account, ap.Accountable, error) {
if domain == config.GetHost() || domain == config.GetAccountDomain() {
// We do local lookups using an empty domain,
// else it will fail the db search below.
domain = ""
}
// Search the database for existing account with USERNAME@DOMAIN.
account, err := d.state.DB.GetAccountByUsernameDomain(
// request a barebones object, it may be in the
// db but with related models not yet dereferenced.
gtscontext.SetBarebones(ctx),
username, domain,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("error checking database for account %s@%s: %w", username, domain, err)
}
if account == nil {
if domain == "" {
// failed local lookup, will be db.ErrNoEntries.
return nil, nil, gtserror.SetUnretrievable(err)
}
// Create and pass-through a new bare-bones model for dereferencing.
account, apubAcc, err := d.enrichAccount(ctx, requestUser, nil, &gtsmodel.Account{
ID: id.NewULID(),
Username: username,
Domain: domain,
}, nil)
if err != nil {
return nil, nil, err
}
// This account was updated, enqueue dereference featured posts.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
if err := d.dereferenceAccountFeatured(ctx, requestUser, account); err != nil {
log.Errorf(ctx, "error fetching account featured collection: %v", err)
}
})
return account, apubAcc, nil
}
// Try to update existing account model.
latest, apubAcc, err := d.RefreshAccount(ctx,
requestUser,
account,
nil,
false,
)
if err != nil {
// Fallback to existing.
return account, nil, nil //nolint
}
if apubAcc == nil {
// This is existing up-to-date account, ensure it is populated.
if err := d.state.DB.PopulateAccount(ctx, account); err != nil {
log.Errorf(ctx, "error populating existing account: %v", err)
}
}
return latest, apubAcc, nil
}
// RefreshAccount: implements Dereferencer{}.RefreshAccount.
func (d *deref) RefreshAccount(ctx context.Context, requestUser string, account *gtsmodel.Account, apubAcc ap.Accountable, force bool) (*gtsmodel.Account, ap.Accountable, error) {
// Check whether needs update (and not forced).
if accountUpToDate(account) && !force {
return account, nil, nil
}
// Parse the URI from account.
uri, err := url.Parse(account.URI)
if err != nil {
return nil, nil, gtserror.Newf("invalid account uri %q: %w", account.URI, err)
}
// Try to update + deref existing account model.
latest, apubAcc, err := d.enrichAccount(ctx,
requestUser,
uri,
account,
apubAcc,
)
if err != nil {
log.Errorf(ctx, "error enriching remote account: %v", err)
// Update fetch-at to slow re-attempts.
account.FetchedAt = time.Now()
_ = d.state.DB.UpdateAccount(ctx, account, "fetched_at")
return nil, nil, err
}
// This account was updated, enqueue re-dereference featured posts.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
if err := d.dereferenceAccountFeatured(ctx, requestUser, account); err != nil {
log.Errorf(ctx, "error fetching account featured collection: %v", err)
}
})
return latest, apubAcc, nil
}
// RefreshAccountAsync: implements Dereferencer{}.RefreshAccountAsync.
func (d *deref) RefreshAccountAsync(ctx context.Context, requestUser string, account *gtsmodel.Account, apubAcc ap.Accountable, force bool) {
// Check whether needs update (and not forced).
if accountUpToDate(account) && !force {
return
}
// Parse the URI from account.
uri, err := url.Parse(account.URI)
if err != nil {
log.Errorf(ctx, "invalid account uri %q: %v", account.URI, err)
return
}
// Enqueue a worker function to enrich this account async.
d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
latest, _, err := d.enrichAccount(ctx, requestUser, uri, account, apubAcc)
if err != nil {
log.Errorf(ctx, "error enriching remote account: %v", err)
return
}
// This account was updated, re-dereference account featured posts.
if err := d.dereferenceAccountFeatured(ctx, requestUser, latest); err != nil {
log.Errorf(ctx, "error fetching account featured collection: %v", err)
}
})
}
// enrichAccount will enrich the given account, whether a new barebones model, or existing model from the database. It handles necessary dereferencing, webfingering etc.
func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.URL, account *gtsmodel.Account, apubAcc ap.Accountable) (*gtsmodel.Account, ap.Accountable, error) {
// Pre-fetch a transport for requesting username, used by later deref procedures.
tsport, err := d.transportController.NewTransportForUsername(ctx, requestUser)
if err != nil {
return nil, nil, gtserror.Newf("couldn't create transport: %w", err)
}
if account.Username != "" {
// A username was provided so we can attempt a webfinger, this ensures up-to-date accountdomain info.
accDomain, accURI, err := d.fingerRemoteAccount(ctx, tsport, account.Username, account.Domain)
if err != nil {
if account.URI == "" {
// this is a new account (to us) with username@domain
// but failed webfinger, nothing more we can do.
err := gtserror.Newf("error webfingering account: %w", err)
return nil, nil, gtserror.SetUnretrievable(err)
}
// Simply log this error and move on, we already have an account URI.
log.Errorf(ctx, "error webfingering[1] remote account %s@%s: %v", account.Username, account.Domain, err)
}
if err == nil {
if account.Domain != accDomain {
// After webfinger, we now have correct account domain from which we can do a final DB check.
alreadyAccount, err := d.state.DB.GetAccountByUsernameDomain(ctx, account.Username, accDomain)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("db err looking for account again after webfinger: %w", err)
}
if alreadyAccount != nil {
// Enrich existing account.
account = alreadyAccount
}
}
// Update account with latest info.
account.URI = accURI.String()
account.Domain = accDomain
uri = accURI
}
}
if uri == nil {
// No URI provided / found, must parse from account.
uri, err = url.Parse(account.URI)
if err != nil {
return nil, nil, gtserror.Newf("invalid uri %q: %w", account.URI, 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 {
return nil, nil, gtserror.Newf("%s is blocked", uri.Host)
}
// Mark deref+update handshake start.
d.startHandshake(requestUser, uri)
defer d.stopHandshake(requestUser, uri)
if apubAcc == nil {
// Dereference latest version of the account.
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 acc from data.
apubAcc, err = ap.ResolveAccountable(ctx, b)
if err != nil {
return nil, nil, gtserror.Newf("error resolving accountable from data for account %s: %w", uri, err)
}
}
// Convert the dereferenced AP account object to our GTS model.
latestAcc, err := d.typeConverter.ASRepresentationToAccount(ctx,
apubAcc,
account.Domain,
)
if err != nil {
return nil, nil, gtserror.Newf("error converting accountable to gts model for account %s: %w", uri, err)
}
if account.Username == "" {
// No username was provided, so no webfinger was attempted earlier.
//
// Now we have a username we can attempt again, to ensure up-to-date
// accountDomain info. For this final attempt we should use the domain
// of the ID of the dereffed account, rather than the URI we were given.
//
// This avoids cases where we were given a URI like
// https://example.org/@someone@somewhere.else and we've been redirected
// from example.org to somewhere.else: we want to take somewhere.else
// as the accountDomain then, not the example.org we were redirected from.
// Assume the host from the returned ActivityPub representation.
idProp := apubAcc.GetJSONLDId()
if idProp == nil || !idProp.IsIRI() {
return nil, nil, gtserror.New("no id property found on person, or id was not an iri")
}
// Get IRI host value.
accHost := idProp.GetIRI().Host
latestAcc.Domain, _, err = d.fingerRemoteAccount(ctx,
tsport,
latestAcc.Username,
accHost,
)
if err != nil {
// We still couldn't webfinger the account, so we're not certain
// what the accountDomain actually is. Still, we can make a solid
// guess that it's the Host of the ActivityPub URI of the account.
// If we're wrong, we can just try again in a couple days.
log.Errorf(ctx, "error webfingering[2] remote account %s@%s: %v", latestAcc.Username, accHost, err)
latestAcc.Domain = accHost
}
}
// Ensure ID is set and update fetch time.
latestAcc.ID = account.ID
latestAcc.FetchedAt = time.Now()
// Ensure the account's avatar media is populated, passing in existing to check for chages.
if err := d.fetchRemoteAccountAvatar(ctx, tsport, account, latestAcc); err != nil {
log.Errorf(ctx, "error fetching remote avatar for account %s: %v", uri, err)
}
// Ensure the account's avatar media is populated, passing in existing to check for chages.
if err := d.fetchRemoteAccountHeader(ctx, tsport, account, latestAcc); err != nil {
log.Errorf(ctx, "error fetching remote header for account %s: %v", uri, err)
}
// Fetch the latest remote account emoji IDs used in account display name/bio.
if _, err = d.fetchRemoteAccountEmojis(ctx, latestAcc, requestUser); err != nil {
log.Errorf(ctx, "error fetching remote emojis for account %s: %v", uri, err)
}
if account.CreatedAt.IsZero() {
// CreatedAt will be zero if no local copy was
// found in one of the GetAccountBy___() functions.
//
// Set time of creation from the last-fetched date.
latestAcc.CreatedAt = latestAcc.FetchedAt
latestAcc.UpdatedAt = latestAcc.FetchedAt
// This is new, put it in the database.
err := d.state.DB.PutAccount(ctx, latestAcc)
if errors.Is(err, db.ErrAlreadyExists) {
// TODO: replace this quick fix with per-URI deref locks.
latestAcc, err = d.state.DB.GetAccountByURI(ctx, latestAcc.URI)
return latestAcc, nil, err
}
if err != nil {
return nil, nil, gtserror.Newf("error putting in database: %w", err)
}
} else {
// Set time of update from the last-fetched date.
latestAcc.UpdatedAt = latestAcc.FetchedAt
// Use existing account values.
latestAcc.CreatedAt = account.CreatedAt
latestAcc.Language = account.Language
// This is an existing account, update the model in the database.
if err := d.state.DB.UpdateAccount(ctx, latestAcc); err != nil {
return nil, nil, gtserror.Newf("error updating database: %w", err)
}
}
return latestAcc, apubAcc, nil
}
func (d *deref) fetchRemoteAccountAvatar(ctx context.Context, tsport transport.Transport, existing, account *gtsmodel.Account) error {
if account.AvatarRemoteURL == "" {
// No fetching to do.
return nil
}
// By default we set the original media attachment ID.
account.AvatarMediaAttachmentID = existing.AvatarMediaAttachmentID
if account.AvatarMediaAttachmentID != "" &&
existing.AvatarRemoteURL == account.AvatarRemoteURL {
// Look for an existing media attachment by the known ID.
media, err := d.state.DB.GetAttachmentByID(ctx, existing.AvatarMediaAttachmentID)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return gtserror.Newf("error getting attachment %s: %w", existing.AvatarMediaAttachmentID, err)
}
if media != nil && *media.Cached {
// Media already cached,
// use this existing.
return nil
}
}
// Parse and validate the newly provided media URL.
avatarURI, err := url.Parse(account.AvatarRemoteURL)
if err != nil {
return gtserror.Newf("error parsing url %s: %w", account.AvatarRemoteURL, err)
}
// Acquire lock for derefs map.
unlock := d.derefAvatarsMu.Lock()
defer unlock()
// Look for an existing dereference in progress.
processing, ok := d.derefAvatars[account.AvatarRemoteURL]
if !ok {
var err error
// Set the media data function to dereference avatar from URI.
data := func(ctx context.Context) (io.ReadCloser, int64, error) {
return tsport.DereferenceMedia(ctx, avatarURI)
}
// Create new media processing request from the media manager instance.
processing, err = d.mediaManager.PreProcessMedia(ctx, data, account.ID, &media.AdditionalMediaInfo{
Avatar: func() *bool { v := true; return &v }(),
RemoteURL: &account.AvatarRemoteURL,
})
if err != nil {
return gtserror.Newf("error preprocessing media for attachment %s: %w", account.AvatarRemoteURL, err)
}
// Store media in map to mark as processing.
d.derefAvatars[account.AvatarRemoteURL] = processing
defer func() {
// On exit safely remove media from map.
unlock := d.derefAvatarsMu.Lock()
delete(d.derefAvatars, account.AvatarRemoteURL)
unlock()
}()
}
// Unlock map.
unlock()
// Start media attachment loading (blocking call).
if _, err := processing.LoadAttachment(ctx); err != nil {
return gtserror.Newf("error loading attachment %s: %w", account.AvatarRemoteURL, err)
}
// Set the newly loaded avatar media attachment ID.
account.AvatarMediaAttachmentID = processing.AttachmentID()
return nil
}
func (d *deref) fetchRemoteAccountHeader(ctx context.Context, tsport transport.Transport, existing, account *gtsmodel.Account) error {
if account.HeaderRemoteURL == "" {
// No fetching to do.
return nil
}
// By default we set the original media attachment ID.
account.HeaderMediaAttachmentID = existing.HeaderMediaAttachmentID
if account.HeaderMediaAttachmentID != "" &&
existing.HeaderRemoteURL == account.HeaderRemoteURL {
// Look for an existing media attachment by the known ID.
media, err := d.state.DB.GetAttachmentByID(ctx, existing.HeaderMediaAttachmentID)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return gtserror.Newf("error getting attachment %s: %w", existing.HeaderMediaAttachmentID, err)
}
if media != nil && *media.Cached {
// Media already cached,
// use this existing.
return nil
}
}
// Parse and validate the newly provided media URL.
headerURI, err := url.Parse(account.HeaderRemoteURL)
if err != nil {
return gtserror.Newf("error parsing url %s: %w", account.HeaderRemoteURL, err)
}
// Acquire lock for derefs map.
unlock := d.derefHeadersMu.Lock()
defer unlock()
// Look for an existing dereference in progress.
processing, ok := d.derefHeaders[account.HeaderRemoteURL]
if !ok {
var err error
// Set the media data function to dereference avatar from URI.
data := func(ctx context.Context) (io.ReadCloser, int64, error) {
return tsport.DereferenceMedia(ctx, headerURI)
}
// Create new media processing request from the media manager instance.
processing, err = d.mediaManager.PreProcessMedia(ctx, data, account.ID, &media.AdditionalMediaInfo{
Header: func() *bool { v := true; return &v }(),
RemoteURL: &account.HeaderRemoteURL,
})
if err != nil {
return gtserror.Newf("error preprocessing media for attachment %s: %w", account.HeaderRemoteURL, err)
}
// Store media in map to mark as processing.
d.derefHeaders[account.HeaderRemoteURL] = processing
defer func() {
// On exit safely remove media from map.
unlock := d.derefHeadersMu.Lock()
delete(d.derefHeaders, account.HeaderRemoteURL)
unlock()
}()
}
// Unlock map.
unlock()
// Start media attachment loading (blocking call).
if _, err := processing.LoadAttachment(ctx); err != nil {
return gtserror.Newf("error loading attachment %s: %w", account.HeaderRemoteURL, err)
}
// Set the newly loaded avatar media attachment ID.
account.HeaderMediaAttachmentID = processing.AttachmentID()
return nil
}
func (d *deref) fetchRemoteAccountEmojis(ctx context.Context, targetAccount *gtsmodel.Account, requestingUsername string) (bool, error) {
maybeEmojis := targetAccount.Emojis
maybeEmojiIDs := targetAccount.EmojiIDs
// It's possible that the account had emoji IDs set on it, but not Emojis
// themselves, depending on how it was fetched before being passed to us.
//
// If we only have IDs, fetch the emojis from the db. We know they're in
// there or else they wouldn't have IDs.
if len(maybeEmojiIDs) > len(maybeEmojis) {
maybeEmojis = make([]*gtsmodel.Emoji, 0, len(maybeEmojiIDs))
for _, emojiID := range maybeEmojiIDs {
maybeEmoji, err := d.state.DB.GetEmojiByID(ctx, emojiID)
if err != nil {
return false, err
}
maybeEmojis = append(maybeEmojis, maybeEmoji)
}
}
// For all the maybe emojis we have, we either fetch them from the database
// (if we haven't already), or dereference them from the remote instance.
gotEmojis, err := d.populateEmojis(ctx, maybeEmojis, requestingUsername)
if err != nil {
return false, err
}
// Extract the ID of each fetched or dereferenced emoji, so we can attach
// this to the account if necessary.
gotEmojiIDs := make([]string, 0, len(gotEmojis))
for _, e := range gotEmojis {
gotEmojiIDs = append(gotEmojiIDs, e.ID)
}
var (
changed = false // have the emojis for this account changed?
maybeLen = len(maybeEmojis)
gotLen = len(gotEmojis)
)
// if the length of everything is zero, this is simple:
// nothing has changed and there's nothing to do
if maybeLen == 0 && gotLen == 0 {
return changed, nil
}
// if the *amount* of emojis on the account has changed, then the got emojis
// are definitely different from the previous ones (if there were any) --
// the account has either more or fewer emojis set on it now, so take the
// discovered emojis as the new correct ones.
if maybeLen != gotLen {
changed = true
targetAccount.Emojis = gotEmojis
targetAccount.EmojiIDs = gotEmojiIDs
return changed, nil
}
// if the lengths are the same but not all of the slices are
// zero, something *might* have changed, so we have to check
// 1. did we have emojis before that we don't have now?
for _, maybeEmoji := range maybeEmojis {
var stillPresent bool
for _, gotEmoji := range gotEmojis {
if maybeEmoji.URI == gotEmoji.URI {
// the emoji we maybe had is still present now,
// so we can stop checking gotEmojis
stillPresent = true
break
}
}
if !stillPresent {
// at least one maybeEmoji is no longer present in
// the got emojis, so we can stop checking now
changed = true
targetAccount.Emojis = gotEmojis
targetAccount.EmojiIDs = gotEmojiIDs
return changed, nil
}
}
// 2. do we have emojis now that we didn't have before?
for _, gotEmoji := range gotEmojis {
var wasPresent bool
for _, maybeEmoji := range maybeEmojis {
// check emoji IDs here as well, because unreferenced
// maybe emojis we didn't already have would not have
// had IDs set on them yet
if gotEmoji.URI == maybeEmoji.URI && gotEmoji.ID == maybeEmoji.ID {
// this got emoji was present already in the maybeEmoji,
// so we can stop checking through maybeEmojis
wasPresent = true
break
}
}
if !wasPresent {
// at least one gotEmojis was not present in
// the maybeEmojis, so we can stop checking now
changed = true
targetAccount.Emojis = gotEmojis
targetAccount.EmojiIDs = gotEmojiIDs
return changed, nil
}
}
return changed, nil
}
// dereferenceAccountFeatured dereferences an account's featuredCollectionURI (if not empty). For each discovered status, this status will
// be dereferenced (if necessary) and marked as pinned (if necessary). Then, old pins will be removed if they're not included in new pins.
func (d *deref) dereferenceAccountFeatured(ctx context.Context, requestUser string, account *gtsmodel.Account) error {
uri, err := url.Parse(account.FeaturedCollectionURI)
if err != nil {
return err
}
// Pre-fetch a transport for requesting username, used by later deref procedures.
tsport, err := d.transportController.NewTransportForUsername(ctx, requestUser)
if err != nil {
return gtserror.Newf("couldn't create transport: %w", err)
}
b, err := tsport.Dereference(ctx, uri)
if err != nil {
return err
}
m := make(map[string]interface{})
if err := json.Unmarshal(b, &m); err != nil {
return gtserror.Newf("error unmarshalling bytes into json: %w", err)
}
t, err := streams.ToType(ctx, m)
if err != nil {
return gtserror.Newf("error resolving json into ap vocab type: %w", err)
}
if t.GetTypeName() != ap.ObjectOrderedCollection {
return gtserror.Newf("%s was not an OrderedCollection", uri)
}
collection, ok := t.(vocab.ActivityStreamsOrderedCollection)
if !ok {
return gtserror.New("couldn't coerce OrderedCollection")
}
items := collection.GetActivityStreamsOrderedItems()
if items == nil {
return gtserror.New("nil orderedItems")
}
// Get previous pinned statuses (we'll need these later).
wasPinned, err := d.state.DB.GetAccountPinnedStatuses(ctx, account.ID)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return gtserror.Newf("error getting account pinned statuses: %w", err)
}
statusURIs := make([]*url.URL, 0, items.Len())
for iter := items.Begin(); iter != items.End(); iter = iter.Next() {
var statusURI *url.URL
switch {
case iter.IsActivityStreamsNote():
// We got a whole Note. Extract the URI.
if note := iter.GetActivityStreamsNote(); note != nil {
if id := note.GetJSONLDId(); id != nil {
statusURI = id.GetIRI()
}
}
case iter.IsActivityStreamsArticle():
// We got a whole Article. Extract the URI.
if article := iter.GetActivityStreamsArticle(); article != nil {
if id := article.GetJSONLDId(); id != nil {
statusURI = id.GetIRI()
}
}
default:
// Try to get just the URI.
statusURI = iter.GetIRI()
}
if statusURI == nil {
continue
}
if statusURI.Host != uri.Host {
// If this status doesn't share a host with its featured
// collection URI, we shouldn't trust it. Just move on.
continue
}
// Already append this status URI to our slice.
// We do this here so that even if we can't get
// the status in the next part for some reason,
// we still know it was *meant* to be pinned.
statusURIs = append(statusURIs, statusURI)
status, _, err := d.getStatusByURI(ctx, requestUser, statusURI)
if err != nil {
// We couldn't get the status, bummer. Just log + move on, we can try later.
log.Errorf(ctx, "error getting status from featured collection %s: %v", statusURI, err)
continue
}
// If the status was already pinned, we don't need to do anything.
if !status.PinnedAt.IsZero() {
continue
}
if status.AccountID != account.ID {
// Someone's pinned a status that doesn't
// belong to them, this doesn't work for us.
continue
}
if status.BoostOfID != "" {
// Someone's pinned a boost. This also
// doesn't work for us.
continue
}
// All conditions are met for this status to
// be pinned, so we can finally update it.
status.PinnedAt = time.Now()
if err := d.state.DB.UpdateStatus(ctx, status, "pinned_at"); err != nil {
log.Errorf(ctx, "error updating status in featured collection %s: %v", status.URI, err)
continue
}
}
// Now that we know which statuses are pinned, we should
// *unpin* previous pinned statuses that aren't included.
outerLoop:
for _, status := range wasPinned {
for _, statusURI := range statusURIs {
if status.URI == statusURI.String() {
// This status is included in most recent
// pinned uris. No need to keep checking.
continue outerLoop
}
}
// Status was pinned before, but is not included
// in most recent pinned uris, so unpin it now.
status.PinnedAt = time.Time{}
if err := d.state.DB.UpdateStatus(ctx, status, "pinned_at"); err != nil {
log.Errorf(ctx, "error unpinning status %s: %v", status.URI, err)
continue
}
}
return nil
}