gotosocial/internal/federation/dereferencing/account.go
kim 3b7faac604
[bugfix] concurrent map writes in dereferencer media processing maps (#2964)
* removes the avatar / header deref maps as we now have per-uri status / account locks, adds retries on data-races, adds separate emoji map mutex

* work with a copy of account / status for each retry loop

* revert to old data race behaviour, it gets too complicated otherwise

---------

Co-authored-by: tobi <tobi.smethurst@protonmail.com>
2024-06-06 10:50:14 +02:00

1210 lines
38 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/activity/pub"
"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"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
// accountFresh returns true if the given account is
// still considered "fresh" according to the desired
// freshness window (falls back to default if nil).
//
// Local accounts will always be considered fresh because
// there's no remote state that could have changed.
//
// True is also returned for suspended accounts, since
// we'll never want to try to refresh one of these.
//
// Return value of false indicates that the account
// is not fresh and should be refreshed from remote.
func accountFresh(
account *gtsmodel.Account,
window *FreshnessWindow,
) bool {
if window == nil {
window = DefaultAccountFreshness
}
if account.IsLocal() {
// Can't refresh
// local accounts.
return true
}
if account.IsSuspended() {
// Can't/won't refresh
// suspended accounts.
return true
}
if account.IsInstance() &&
!account.IsNew() {
// Existing instance account.
// No need for refresh.
return true
}
// Moment when the account is
// considered stale according to
// desired freshness window.
staleAt := account.FetchedAt.Add(
time.Duration(*window),
)
// It's still fresh if the time now
// is not past the point of staleness.
return !time.Now().After(staleAt)
}
// GetAccountByURI will attempt to fetch an accounts by its URI, first checking the database. In the case of a newly-met remote model, or a remote model
// whose last_fetched date is beyond a certain interval, the account will be dereferenced. In the case of dereferencing, some low-priority account information
// may be enqueued for asynchronous fetching, e.g. featured account statuses (pins). An ActivityPub object indicates the account was dereferenced.
func (d *Dereferencer) GetAccountByURI(ctx context.Context, requestUser string, uri *url.URL) (*gtsmodel.Account, ap.Accountable, error) {
// Fetch and dereference account if necessary.
account, accountable, err := d.getAccountByURI(ctx,
requestUser,
uri,
)
if err != nil {
return nil, nil, err
}
if accountable != nil {
// This account was updated, enqueue re-dereference featured posts.
d.state.Workers.Dereference.Queue.Push(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, accountable, nil
}
// getAccountByURI is a package internal form of .GetAccountByURI() that doesn't bother dereferencing featured posts on update.
func (d *Dereferencer) 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.enrichAccountSafely(ctx, requestUser, uri, &gtsmodel.Account{
ID: id.NewULID(),
Domain: uri.Host,
URI: uriStr,
}, nil)
}
if accountFresh(account, nil) {
// This is an existing account that is up-to-date,
// before returning ensure it is fully 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, accountable, err := d.enrichAccountSafely(ctx,
requestUser,
uri,
account,
nil,
)
if err != nil {
log.Errorf(ctx, "error enriching remote account: %v", err)
// Fallback to existing.
return account, nil, nil
}
return latest, accountable, nil
}
// GetAccountByUsernameDomain will attempt to fetch an accounts by its username@domain, first checking the database. In the case of a newly-met remote model,
// or a remote model whose last_fetched date is beyond a certain interval, the account will be dereferenced. In the case of dereferencing, some low-priority
// account information may be enqueued for asynchronous fetching, e.g. featured account statuses (pins). An ActivityPub object indicates the account was dereferenced.
func (d *Dereferencer) GetAccountByUsernameDomain(ctx context.Context, requestUser string, username string, domain string) (*gtsmodel.Account, ap.Accountable, error) {
account, accountable, err := d.getAccountByUsernameDomain(
ctx,
requestUser,
username,
domain,
)
if err != nil {
return nil, nil, err
}
if accountable != nil {
// This account was updated, enqueue re-dereference featured posts.
d.state.Workers.Dereference.Queue.Push(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, accountable, nil
}
// getAccountByUsernameDomain is a package internal form of
// GetAccountByUsernameDomain() that doesn't bother deref of featured posts.
func (d *Dereferencer) 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, accountable, err := d.enrichAccountSafely(ctx, requestUser, nil, &gtsmodel.Account{
ID: id.NewULID(),
Domain: domain,
Username: username,
}, nil)
if err != nil {
return nil, nil, err
}
return account, accountable, nil
}
// Try to update existing account model.
latest, accountable, err := d.RefreshAccount(ctx,
requestUser,
account,
nil,
nil,
)
if err != nil {
// Fallback to existing.
return account, nil, nil //nolint
}
if accountable == nil {
// This is existing up-to-date account, ensure it is populated.
if err := d.state.DB.PopulateAccount(ctx, latest); err != nil {
log.Errorf(ctx, "error populating existing account: %v", err)
}
}
return latest, accountable, nil
}
// RefreshAccount updates the given account if it's a
// remote account, and considered stale / not fresh
// based on Account.FetchedAt and desired freshness.
//
// An updated account model is returned, but in the
// case of dereferencing, some low-priority account
// info may be enqueued for asynchronous fetching,
// e.g. featured account statuses (pins).
//
// An ActivityPub object indicates the account was
// dereferenced (i.e. updated).
func (d *Dereferencer) RefreshAccount(
ctx context.Context,
requestUser string,
account *gtsmodel.Account,
accountable ap.Accountable,
window *FreshnessWindow,
) (*gtsmodel.Account, ap.Accountable, error) {
// If no incoming data is provided,
// check whether account needs refresh.
if accountable == nil &&
accountFresh(account, window) {
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 passed account model.
latest, accountable, err := d.enrichAccountSafely(ctx,
requestUser,
uri,
account,
accountable,
)
if err != nil {
log.Errorf(ctx, "error enriching remote account: %v", err)
return nil, nil, gtserror.Newf("error enriching remote account: %w", err)
}
if accountable != nil {
// This account was updated, enqueue re-dereference featured posts.
d.state.Workers.Dereference.Queue.Push(func(ctx context.Context) {
if err := d.dereferenceAccountFeatured(ctx, requestUser, latest); err != nil {
log.Errorf(ctx, "error fetching account featured collection: %v", err)
}
})
}
return latest, accountable, nil
}
// RefreshAccountAsync enqueues the given account for
// an asychronous update fetching, if it's a remote
// account, and considered stale / not fresh based on
// Account.FetchedAt and desired freshness.
//
// This is a more optimized form of manually enqueueing
// .UpdateAccount() to the federation worker, since it
// only enqueues update if necessary.
func (d *Dereferencer) RefreshAccountAsync(
ctx context.Context,
requestUser string,
account *gtsmodel.Account,
accountable ap.Accountable,
window *FreshnessWindow,
) {
// If no incoming data is provided,
// check whether account needs refresh.
if accountable == nil &&
accountFresh(account, window) {
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.Dereference.Queue.Push(func(ctx context.Context) {
latest, accountable, err := d.enrichAccountSafely(ctx, requestUser, uri, account, accountable)
if err != nil {
log.Errorf(ctx, "error enriching remote account: %v", err)
return
}
if accountable != nil {
// This account was updated, enqueue re-dereference featured posts.
if err := d.dereferenceAccountFeatured(ctx, requestUser, latest); err != nil {
log.Errorf(ctx, "error fetching account featured collection: %v", err)
}
}
})
}
// enrichAccountSafely wraps enrichAccount() to perform
// it within the State{}.FedLocks mutexmap, which protects
// dereferencing actions with per-URI mutex locks.
func (d *Dereferencer) enrichAccountSafely(
ctx context.Context,
requestUser string,
uri *url.URL,
account *gtsmodel.Account,
accountable ap.Accountable,
) (*gtsmodel.Account, ap.Accountable, error) {
// Noop if account suspended;
// we don't want to deref it.
if account.IsSuspended() {
return account, nil, nil
}
// By default use account.URI
// as the per-URI deref lock.
var uriStr string
if account.URI != "" {
uriStr = account.URI
} else {
// No URI is set yet, instead generate a faux-one from user+domain.
uriStr = "https://" + account.Domain + "/users/" + account.Username
}
// Acquire per-URI deref lock, wraping unlock
// to safely defer in case of panic, while still
// performing more granular unlocks when needed.
unlock := d.state.FedLocks.Lock(uriStr)
unlock = util.DoOnce(unlock)
defer unlock()
// Perform status enrichment with passed vars.
latest, apubAcc, err := d.enrichAccount(ctx,
requestUser,
uri,
account,
accountable,
)
if gtserror.StatusCode(err) >= 400 {
if account.IsNew() {
// This was a new account enrich
// attempt which failed before we
// got to store it, so we can't
// return anything useful.
return nil, nil, err
}
// We had this account stored already
// before this enrichment attempt.
//
// Update fetched_at to slow re-attempts
// but don't return early. We can still
// return the model we had stored already.
account.FetchedAt = time.Now()
if err := d.state.DB.UpdateAccount(ctx, account, "fetched_at"); err != nil {
log.Error(ctx, "error updating %s fetched_at: %v", uriStr, err)
}
}
// Unlock now
// we're done.
unlock()
if errors.Is(err, db.ErrAlreadyExists) {
// Ensure AP model isn't set,
// otherwise this indicates WE
// enriched the account.
apubAcc = nil
// DATA RACE! We likely lost out to another goroutine
// in a call to db.Put(Account). Look again in DB by URI.
latest, err = d.state.DB.GetAccountByURI(ctx, account.URI)
if err != nil {
err = gtserror.Newf("error getting account %s from database after race: %w", uriStr, err)
}
}
return latest, apubAcc, 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 *Dereferencer) 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)
switch {
case err != nil && 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)
case err != nil:
// 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,
)
case account.Domain != accDomain:
// After webfinger, we now have correct account domain from which we can do a final DB check.
alreadyAcc, err := d.state.DB.GetAccountByUsernameDomain(ctx, account.Username, accDomain)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("db error getting account after webfinger: %w", err)
}
if alreadyAcc != nil {
// We had this account stored
// under discovered accountDomain.
//
// Proceed with this account.
account = alreadyAcc
}
// Whether we had the account or not, we
// now have webfinger info relevant to the
// account, so fallthrough to set webfinger
// info on either the account we just found,
// or the stub account we were passed.
fallthrough
default:
// 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 {
err := gtserror.Newf("invalid uri %q: %w", account.URI, err)
return nil, nil, gtserror.SetUnretrievable(err)
}
// Check URI scheme ahead of time for more useful errs.
if uri.Scheme != "http" && uri.Scheme != "https" {
err := gtserror.Newf("invalid uri %q: scheme must be http(s)", account.URI)
return nil, nil, gtserror.SetUnretrievable(err)
}
}
/*
BY THIS POINT we must have an account URI set,
either provided, pinned to the account, or
obtained via webfinger call.
*/
// 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 {
// We were not given any (partial) ActivityPub
// version of this account as a parameter.
// Dereference latest version of the account.
rsp, err := tsport.Dereference(ctx, uri)
if err != nil {
err := gtserror.Newf("error dereferencing %s: %w", uri, err)
return nil, nil, gtserror.SetUnretrievable(err)
}
// Attempt to resolve ActivityPub acc from response.
apubAcc, err = ap.ResolveAccountable(ctx, rsp.Body)
// Tidy up now done.
_ = rsp.Body.Close()
if err != nil {
// ResolveAccountable will set gtserror.WrongType
// on the returned error, so we don't need to do it here.
err = gtserror.Newf("error resolving accountable %s: %w", uri, err)
return nil, nil, err
}
// Check whether input URI and final returned URI
// have changed (i.e. we followed some redirects).
if finalURIStr := rsp.Request.URL.String(); //
finalURIStr != uri.String() {
// NOTE: this URI check + database call is performed
// AFTER reading and closing response body, for performance.
//
// Check whether we have this account stored under *final* URI.
alreadyAcc, err := d.state.DB.GetAccountByURI(ctx, finalURIStr)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, nil, gtserror.Newf("db error getting account after redirects: %w", err)
}
if alreadyAcc != nil {
// We had this account stored
// under discovered final URI.
//
// Proceed with this account.
account = alreadyAcc
}
// Update the input URI to
// the final determined URI
// for later URI checks.
uri = rsp.Request.URL
}
}
/*
BY THIS POINT we must have the ActivityPub
representation of the account, either provided,
or obtained via a dereference call.
*/
// Convert the dereferenced AP account object to our GTS model.
//
// We put this in the variable latestAcc because we might want
// to compare the provided account model with this fresh version,
// in order to check if anything changed since we last saw it.
latestAcc, err := d.converter.ASRepresentationToAccount(ctx,
apubAcc,
account.Domain,
)
if err != nil {
// ASRepresentationToAccount will set Malformed on the
// returned error, so we don't need to do it here.
err = gtserror.Newf("error converting %s to gts model: %w", uri, err)
return nil, nil, err
}
if account.Username == "" {
// Assume the host from the
// ActivityPub representation.
id := ap.GetJSONLDId(apubAcc)
if id == nil {
return nil, nil, gtserror.New("no id property found on person, or id was not an iri")
}
// Get IRI host value.
accHost := id.Host
// 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.
latestAcc.Domain, _, err = d.fingerRemoteAccount(ctx,
tsport,
latestAcc.Username,
accHost,
)
if err != nil {
// Webfingering account still failed, so we're not certain
// what the accountDomain actually is. Exit here for safety.
return nil, nil, gtserror.Newf(
"error webfingering remote account %s@%s: %w",
latestAcc.Username, accHost, err,
)
}
}
if latestAcc.Domain == "" {
// Ensure we have a domain set by this point,
// otherwise it gets stored as a local user!
return nil, nil, gtserror.Newf("empty domain for %s", uri)
}
// Ensure the final parsed account URI / URL matches
// the input URI we fetched (or received) it as.
if expect := uri.String(); latestAcc.URI != expect &&
latestAcc.URL != expect {
return nil, nil, gtserror.Newf(
"dereferenced account uri %s does not match %s",
latestAcc.URI, expect,
)
}
/*
BY THIS POINT we have more or less a fullly-formed
representation of the target account, derived from
a combination of webfinger lookups and dereferencing.
Further fetching beyond this point is for peripheral
things like account avatar, header, emojis, stats.
*/
// Ensure internal db 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)
}
// Fetch followers/following count for this account.
if err := d.fetchRemoteAccountStats(ctx, latestAcc, requestUser); err != nil {
log.Errorf(ctx, "error fetching remote stats for account %s: %v", uri, err)
}
if account.IsNew() {
// Prefer published/created time from
// apubAcc, fall back to FetchedAt value.
if latestAcc.CreatedAt.IsZero() {
latestAcc.CreatedAt = latestAcc.FetchedAt
}
// Set time of update from the last-fetched date.
latestAcc.UpdatedAt = latestAcc.FetchedAt
// This is new, put it in the database.
err := d.state.DB.PutAccount(ctx, latestAcc)
if err != nil {
return nil, nil, gtserror.Newf("error putting in database: %w", err)
}
} else {
// Prefer published time from apubAcc,
// fall back to previous stored value.
if latestAcc.CreatedAt.IsZero() {
latestAcc.CreatedAt = account.CreatedAt
}
// Set time of update from the last-fetched date.
latestAcc.UpdatedAt = latestAcc.FetchedAt
// 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 *Dereferencer) fetchRemoteAccountAvatar(ctx context.Context, tsport transport.Transport, existing, latestAcc *gtsmodel.Account) error {
if latestAcc.AvatarRemoteURL == "" {
// No avatar set on newest model, leave
// latest avatar attachment ID empty.
return nil
}
// By default we keep the previous media attachment ID. This will only
// be changed if and when we have the new media loaded into storage.
latestAcc.AvatarMediaAttachmentID = existing.AvatarMediaAttachmentID
// If we had a media attachment ID already, and the URL
// of the attachment hasn't changed from existing -> latest,
// then we may be able to just keep our existing attachment
// without having to make any remote calls.
if latestAcc.AvatarMediaAttachmentID != "" &&
existing.AvatarRemoteURL == latestAcc.AvatarRemoteURL {
// Ensure we have media attachment with 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)
}
// Ensure attachment has correct properties.
if media != nil && media.RemoteURL == latestAcc.AvatarRemoteURL {
// We already have the most up-to-date
// media attachment, keep using it.
return nil
}
}
// If we reach here, we know we need to fetch the most
// up-to-date version of the attachment from remote.
// Parse and validate the newly provided media URL.
avatarURI, err := url.Parse(latestAcc.AvatarRemoteURL)
if err != nil {
return gtserror.Newf("error parsing url %s: %w", latestAcc.AvatarRemoteURL, err)
}
// 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 := d.mediaManager.PreProcessMedia(data, latestAcc.ID, &media.AdditionalMediaInfo{
Avatar: func() *bool { v := true; return &v }(),
RemoteURL: &latestAcc.AvatarRemoteURL,
})
// Start media attachment loading (blocking call).
if _, err := processing.LoadAttachment(ctx); err != nil {
return gtserror.Newf("error loading attachment %s: %w", latestAcc.AvatarRemoteURL, err)
}
// Set the newly loaded avatar media attachment ID.
latestAcc.AvatarMediaAttachmentID = processing.AttachmentID()
return nil
}
func (d *Dereferencer) fetchRemoteAccountHeader(ctx context.Context, tsport transport.Transport, existing, latestAcc *gtsmodel.Account) error {
if latestAcc.HeaderRemoteURL == "" {
// No header set on newest model, leave
// latest header attachment ID empty.
return nil
}
// By default we keep the previous media attachment ID. This will only
// be changed if and when we have the new media loaded into storage.
latestAcc.HeaderMediaAttachmentID = existing.HeaderMediaAttachmentID
// If we had a media attachment ID already, and the URL
// of the attachment hasn't changed from existing -> latest,
// then we may be able to just keep our existing attachment
// without having to make any remote calls.
if latestAcc.HeaderMediaAttachmentID != "" &&
existing.HeaderRemoteURL == latestAcc.HeaderRemoteURL {
// Ensure we have media attachment with 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)
}
// Ensure attachment has correct properties.
if media != nil && media.RemoteURL == latestAcc.HeaderRemoteURL {
// We already have the most up-to-date
// media attachment, keep using it.
return nil
}
}
// If we reach here, we know we need to fetch the most
// up-to-date version of the attachment from remote.
// Parse and validate the newly provided media URL.
headerURI, err := url.Parse(latestAcc.HeaderRemoteURL)
if err != nil {
return gtserror.Newf("error parsing url %s: %w", latestAcc.HeaderRemoteURL, err)
}
// 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 := d.mediaManager.PreProcessMedia(data, latestAcc.ID, &media.AdditionalMediaInfo{
Header: func() *bool { v := true; return &v }(),
RemoteURL: &latestAcc.HeaderRemoteURL,
})
// Start media attachment loading (blocking call).
if _, err := processing.LoadAttachment(ctx); err != nil {
return gtserror.Newf("error loading attachment %s: %w", latestAcc.HeaderRemoteURL, err)
}
// Set the newly loaded avatar media attachment ID.
latestAcc.HeaderMediaAttachmentID = processing.AttachmentID()
return nil
}
func (d *Dereferencer) 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
}
func (d *Dereferencer) fetchRemoteAccountStats(ctx context.Context, account *gtsmodel.Account, requestUser string) error {
// Ensure we have a stats model for this account.
if account.Stats == nil {
if err := d.state.DB.PopulateAccountStats(ctx, account); err != nil {
return gtserror.Newf("db error getting account stats: %w", err)
}
}
// We want to update stats by getting remote
// followers/following/statuses counts for
// this account.
//
// If we fail getting any particular stat,
// it will just fall back to counting local.
// Followers first.
if count, err := d.countCollection(
ctx,
account.FollowersURI,
requestUser,
); err != nil {
// Log this but don't bail.
log.Warnf(ctx,
"couldn't count followers for @%s@%s: %v",
account.Username, account.Domain, err,
)
} else if count > 0 {
// Positive integer is useful!
account.Stats.FollowersCount = &count
}
// Now following.
if count, err := d.countCollection(
ctx,
account.FollowingURI,
requestUser,
); err != nil {
// Log this but don't bail.
log.Warnf(ctx,
"couldn't count following for @%s@%s: %v",
account.Username, account.Domain, err,
)
} else if count > 0 {
// Positive integer is useful!
account.Stats.FollowingCount = &count
}
// Now statuses count.
if count, err := d.countCollection(
ctx,
account.OutboxURI,
requestUser,
); err != nil {
// Log this but don't bail.
log.Warnf(ctx,
"couldn't count statuses for @%s@%s: %v",
account.Username, account.Domain, err,
)
} else if count > 0 {
// Positive integer is useful!
account.Stats.StatusesCount = &count
}
// Update stats now.
if err := d.state.DB.UpdateAccountStats(
ctx,
account.Stats,
"followers_count",
"following_count",
"statuses_count",
); err != nil {
return gtserror.Newf("db error updating account stats: %w", err)
}
return nil
}
// countCollection parses the given uriStr,
// dereferences the result as a collection
// type, and returns total items as 0, or
// a positive integer, or -1 if total items
// cannot be counted.
//
// Error will be returned for invalid non-empty
// URIs or dereferencing isses.
func (d *Dereferencer) countCollection(
ctx context.Context,
uriStr string,
requestUser string,
) (int, error) {
if uriStr == "" {
return -1, nil
}
uri, err := url.Parse(uriStr)
if err != nil {
return -1, err
}
collect, err := d.dereferenceCollection(ctx, requestUser, uri)
if err != nil {
return -1, err
}
return collect.TotalItems(), 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 *Dereferencer) dereferenceAccountFeatured(ctx context.Context, requestUser string, account *gtsmodel.Account) error {
uri, err := url.Parse(account.FeaturedCollectionURI)
if err != nil {
return err
}
collect, err := d.dereferenceCollection(ctx, requestUser, uri)
if err != nil {
return err
}
// 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)
}
var statusURIs []*url.URL
for {
// Get next collect item.
item := collect.NextItem()
if item == nil {
break
}
// Check for available IRI.
itemIRI, _ := pub.ToId(item)
if itemIRI == nil {
continue
}
if itemIRI.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, itemIRI)
// Search for status by URI. Note this may return an existing model
// we have stored with an error from attempted update, so check both.
status, _, _, err := d.getStatusByURI(ctx, requestUser, itemIRI)
if err != nil {
log.Errorf(ctx, "error getting status from featured collection %s: %v", itemIRI, err)
if status == nil {
// This is only unactionable
// if no status was returned.
continue
}
}
// If the status was already pinned,
// we don't need to do anything.
if !status.PinnedAt.IsZero() {
continue
}
if status.AccountURI != account.URI {
// 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. (note
// we check using BoostOfID since
// BoostOfURI isn't *always* set).
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
}