gotosocial/internal/processing/account/follow.go

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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package account
import (
"context"
"errors"
"fmt"
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"github.com/superseriousbusiness/gotosocial/internal/ap"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
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"github.com/superseriousbusiness/gotosocial/internal/messages"
"github.com/superseriousbusiness/gotosocial/internal/uris"
)
// FollowCreate handles a follow request to an account, either remote or local.
func (p *Processor) FollowCreate(ctx context.Context, requestingAccount *gtsmodel.Account, form *apimodel.AccountFollowRequest) (*apimodel.Relationship, gtserror.WithCode) {
targetAccount, errWithCode := p.getFollowTarget(ctx, requestingAccount.ID, form.ID)
if errWithCode != nil {
return nil, errWithCode
}
// Check if a follow exists already.
if follows, err := p.state.DB.IsFollowing(ctx, requestingAccount, targetAccount); err != nil {
err = fmt.Errorf("FollowCreate: db error checking follow: %w", err)
return nil, gtserror.NewErrorInternalError(err)
} else if follows {
// Already follows, just return current relationship.
return p.RelationshipGet(ctx, requestingAccount, form.ID)
}
// Check if a follow request exists already.
if followRequested, err := p.state.DB.IsFollowRequested(ctx, requestingAccount, targetAccount); err != nil {
err = fmt.Errorf("FollowCreate: db error checking follow request: %w", err)
return nil, gtserror.NewErrorInternalError(err)
} else if followRequested {
// Already follow requested, just return current relationship.
return p.RelationshipGet(ctx, requestingAccount, form.ID)
}
// Create and store a new follow request.
followID, err := id.NewRandomULID()
if err != nil {
return nil, gtserror.NewErrorInternalError(err)
}
followURI := uris.GenerateURIForFollow(requestingAccount.Username, followID)
fr := &gtsmodel.FollowRequest{
ID: followID,
URI: followURI,
AccountID: requestingAccount.ID,
Account: requestingAccount,
TargetAccountID: form.ID,
TargetAccount: targetAccount,
ShowReblogs: form.Reblogs,
Notify: form.Notify,
}
if err := p.state.DB.Put(ctx, fr); err != nil {
err = fmt.Errorf("FollowCreate: error creating follow request in db: %s", err)
return nil, gtserror.NewErrorInternalError(err)
}
if targetAccount.IsLocal() && !*targetAccount.Locked {
// If the target account is local and not locked,
// we can already accept the follow request and
// skip any further processing.
//
// Because we know the requestingAccount is also
// local, we don't need to federate the accept out.
if _, err := p.state.DB.AcceptFollowRequest(ctx, requestingAccount.ID, form.ID); err != nil {
err = fmt.Errorf("FollowCreate: error accepting follow request for local unlocked account: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
} else if targetAccount.IsRemote() {
// Otherwise we leave the follow request as it is,
// and we handle the rest of the process async.
p.state.Workers.EnqueueClientAPI(ctx, messages.FromClientAPI{
APObjectType: ap.ActivityFollow,
APActivityType: ap.ActivityCreate,
GTSModel: fr,
OriginAccount: requestingAccount,
TargetAccount: targetAccount,
})
}
return p.RelationshipGet(ctx, requestingAccount, form.ID)
}
// FollowRemove handles the removal of a follow/follow request to an account, either remote or local.
func (p *Processor) FollowRemove(ctx context.Context, requestingAccount *gtsmodel.Account, targetAccountID string) (*apimodel.Relationship, gtserror.WithCode) {
targetAccount, errWithCode := p.getFollowTarget(ctx, requestingAccount.ID, targetAccountID)
if errWithCode != nil {
return nil, errWithCode
}
// Unfollow and deal with side effects.
msgs, err := p.unfollow(ctx, requestingAccount, targetAccount)
if err != nil {
return nil, gtserror.NewErrorNotFound(fmt.Errorf("FollowRemove: account %s not found in the db: %s", targetAccountID, err))
}
// Batch queue accreted client api messages.
p.state.Workers.EnqueueClientAPI(ctx, msgs...)
return p.RelationshipGet(ctx, requestingAccount, targetAccountID)
}
/*
Utility functions.
*/
// getFollowTarget is a convenience function which:
// - Checks if account is trying to follow/unfollow itself.
// - Returns not found if there's a block in place between accounts.
// - Returns target account according to its id.
func (p *Processor) getFollowTarget(ctx context.Context, requestingAccountID string, targetAccountID string) (*gtsmodel.Account, gtserror.WithCode) {
// Account can't follow or unfollow itself.
if requestingAccountID == targetAccountID {
err := errors.New("account can't follow or unfollow itself")
return nil, gtserror.NewErrorNotAcceptable(err)
}
// Do nothing if a block exists in either direction between accounts.
if blocked, err := p.state.DB.IsBlocked(ctx, requestingAccountID, targetAccountID, true); err != nil {
err = fmt.Errorf("db error checking block between accounts: %w", err)
return nil, gtserror.NewErrorInternalError(err)
} else if blocked {
err = errors.New("block exists between accounts")
return nil, gtserror.NewErrorNotFound(err)
}
// Ensure target account retrievable.
targetAccount, err := p.state.DB.GetAccountByID(ctx, targetAccountID)
if err != nil {
if !errors.Is(err, db.ErrNoEntries) {
// Real db error.
err = fmt.Errorf("db error looking for target account %s: %w", targetAccountID, err)
return nil, gtserror.NewErrorInternalError(err)
}
// Account not found.
err = fmt.Errorf("target account %s not found in the db", targetAccountID)
return nil, gtserror.NewErrorNotFound(err, err.Error())
}
return targetAccount, nil
}
// unfollow is a convenience function for having requesting account
// unfollow (and un follow request) target account, if follows and/or
// follow requests exist.
//
// If a follow and/or follow request was removed this way, one or two
// messages will be returned which should then be processed by a client
// api worker.
func (p *Processor) unfollow(ctx context.Context, requestingAccount *gtsmodel.Account, targetAccount *gtsmodel.Account) ([]messages.FromClientAPI, error) {
msgs := []messages.FromClientAPI{}
if fURI, err := p.state.DB.Unfollow(ctx, requestingAccount.ID, targetAccount.ID); err != nil {
err = fmt.Errorf("unfollow: error deleting follow from %s targeting %s: %w", requestingAccount.ID, targetAccount.ID, err)
return nil, err
} else if fURI != "" {
// Follow status changed, process side effects.
msgs = append(msgs, messages.FromClientAPI{
APObjectType: ap.ActivityFollow,
APActivityType: ap.ActivityUndo,
GTSModel: &gtsmodel.Follow{
AccountID: requestingAccount.ID,
TargetAccountID: targetAccount.ID,
URI: fURI,
},
OriginAccount: requestingAccount,
TargetAccount: targetAccount,
})
}
if frURI, err := p.state.DB.UnfollowRequest(ctx, requestingAccount.ID, targetAccount.ID); err != nil {
err = fmt.Errorf("unfollow: error deleting follow request from %s targeting %s: %w", requestingAccount.ID, targetAccount.ID, err)
return nil, err
} else if frURI != "" {
// Follow request status changed, process side effects.
msgs = append(msgs, messages.FromClientAPI{
APObjectType: ap.ActivityFollow,
APActivityType: ap.ActivityUndo,
GTSModel: &gtsmodel.Follow{
AccountID: requestingAccount.ID,
TargetAccountID: targetAccount.ID,
URI: frURI,
},
OriginAccount: requestingAccount,
TargetAccount: targetAccount,
})
}
return msgs, nil
}