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/*
GoToSocial
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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"
"fmt"
"net/url"
"strings"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/transport"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
func (d *deref) fingerRemoteAccount(ctx context.Context, transport transport.Transport, targetUsername string, targetHost string) (accountDomain string, accountURI *url.URL, err error) {
b, err := transport.Finger(ctx, targetUsername, targetHost)
if err != nil {
err = fmt.Errorf("fingerRemoteAccount: error fingering @%s@%s: %s", targetUsername, targetHost, err)
return
}
resp := &apimodel.WellKnownResponse{}
if err = json.Unmarshal(b, resp); err != nil {
err = fmt.Errorf("fingerRemoteAccount: could not unmarshal server response as WebfingerAccountResponse while dereferencing @%s@%s: %s", targetUsername, targetHost, err)
return
}
if len(resp.Links) == 0 {
err = fmt.Errorf("fingerRemoteAccount: no links found in webfinger response %s", string(b))
return
}
if resp.Subject == "" {
err = fmt.Errorf("fingerRemoteAccount: no subject found in webfinger response %s", string(b))
return
}
_, accountDomain, err = util.ExtractWebfingerParts(resp.Subject)
if err != nil {
err = fmt.Errorf("fingerRemoteAccount: error extracting webfinger subject parts: %s", err)
}
// look through the links for the first one that matches what we need
for _, l := range resp.Links {
if l.Rel == "self" && (strings.EqualFold(l.Type, "application/activity+json") || strings.EqualFold(l.Type, "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"")) {
if uri, thiserr := url.Parse(l.Href); thiserr == nil && (uri.Scheme == "http" || uri.Scheme == "https") {
// found it!
accountURI = uri
return
}
}
}
err = errors.New("fingerRemoteAccount: no match found in webfinger response")
return
}
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