GoToSocial/internal/processing/parsemention.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 processing
import (
"context"
"fmt"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/federation"
"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/state"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
// GetParseMentionFunc returns a new ParseMentionFunc using the provided state and federator.
// State is used for doing local database lookups; federator is used for remote account lookups (if necessary).
func GetParseMentionFunc(state *state.State, federator *federation.Federator) gtsmodel.ParseMentionFunc {
return func(ctx context.Context, namestring string, originAccountID string, statusID string) (*gtsmodel.Mention, error) {
// Get the origin account first since
// we'll need it to create the mention.
originAcct, err := state.DB.GetAccountByID(ctx, originAccountID)
if err != nil {
return nil, fmt.Errorf(
"db error getting mention origin account %s: %w",
originAccountID, err,
)
}
// Parse target components from the
// "@someone@example.org" namestring.
targetUsername, targetHost, err := util.ExtractNamestringParts(namestring)
if err != nil {
return nil, fmt.Errorf(
"error extracting mention target: %w",
err,
)
}
// It's a "local" mention if namestring
// looks like one of the following:
//
// - "@someone" with no host component.
// - "@someone@gts.example.org" and we're host "gts.example.org".
// - "@someone@example.org" and we're account-domain "example.org".
local := targetHost == "" ||
targetHost == config.GetHost() ||
targetHost == config.GetAccountDomain()
// Either a local or remote
// target for the mention.
var targetAcct *gtsmodel.Account
if local {
// Lookup local target accounts in the db only.
targetAcct, err = state.DB.GetAccountByUsernameDomain(ctx, targetUsername, "")
if err != nil {
return nil, fmt.Errorf(
"db error getting mention local target account %s: %w",
targetUsername, err,
)
}
} else {
// If origin account is local, use
// it to do potential dereference.
// Else fallback to empty string,
// which uses instance account.
var requestUser string
if originAcct.IsLocal() {
requestUser = originAcct.Username
}
targetAcct, _, err = federator.GetAccountByUsernameDomain(
gtscontext.SetFastFail(ctx),
requestUser,
targetUsername,
targetHost,
)
if err != nil {
return nil, fmt.Errorf(
"error fetching mention remote target account: %w",
err,
)
}
}
// Return mention with useful populated fields,
// but *don't* store it in the database; that's
// up to the calling function to do, if they want.
return &gtsmodel.Mention{
ID: id.NewULID(),
StatusID: statusID,
OriginAccountID: originAcct.ID,
OriginAccountURI: originAcct.URI,
OriginAccount: originAcct,
TargetAccountID: targetAcct.ID,
TargetAccountURI: targetAcct.URI,
TargetAccountURL: targetAcct.URL,
TargetAccount: targetAcct,
NameString: namestring,
}, nil
}
}