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/*
GoToSocial
Copyright (C) 2021 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"
"github.com/superseriousbusiness/activity/streams"
"github.com/superseriousbusiness/activity/streams/vocab"
"github.com/superseriousbusiness/gotosocial/internal/ap"
)
// DereferenceCollectionPage returns the activitystreams CollectionPage at the specified IRI, or an error if something goes wrong.
func (d *deref) DereferenceCollectionPage(ctx context.Context, username string, pageIRI *url.URL) (ap.CollectionPageable, error) {
if blocked, err := d.db.IsDomainBlocked(ctx, pageIRI.Host); blocked || err != nil {
return nil, fmt.Errorf("DereferenceCollectionPage: domain %s is blocked", pageIRI.Host)
}
transport, err := d.transportController.NewTransportForUsername(ctx, username)
if err != nil {
return nil, fmt.Errorf("DereferenceCollectionPage: error creating transport: %s", err)
}
b, err := transport.Dereference(ctx, pageIRI)
if err != nil {
return nil, fmt.Errorf("DereferenceCollectionPage: error deferencing %s: %s", pageIRI.String(), err)
}
m := make(map[string]interface{})
if err := json.Unmarshal(b, &m); err != nil {
return nil, fmt.Errorf("DereferenceCollectionPage: error unmarshalling bytes into json: %s", err)
}
t, err := streams.ToType(ctx, m)
if err != nil {
return nil, fmt.Errorf("DereferenceCollectionPage: error resolving json into ap vocab type: %s", err)
}
if t.GetTypeName() != ap.ObjectCollectionPage {
return nil, fmt.Errorf("DereferenceCollectionPage: type name %s not supported", t.GetTypeName())
}
p, ok := t.(vocab.ActivityStreamsCollectionPage)
if !ok {
return nil, errors.New("DereferenceCollectionPage: error resolving type as activitystreams collection page")
}
return p, nil
}
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