collectionpage.go (2545B)
1 // GoToSocial 2 // Copyright (C) GoToSocial Authors admin@gotosocial.org 3 // SPDX-License-Identifier: AGPL-3.0-or-later 4 // 5 // This program is free software: you can redistribute it and/or modify 6 // it under the terms of the GNU Affero General Public License as published by 7 // the Free Software Foundation, either version 3 of the License, or 8 // (at your option) any later version. 9 // 10 // This program is distributed in the hope that it will be useful, 11 // but WITHOUT ANY WARRANTY; without even the implied warranty of 12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 // GNU Affero General Public License for more details. 14 // 15 // You should have received a copy of the GNU Affero General Public License 16 // along with this program. If not, see <http://www.gnu.org/licenses/>. 17 18 package dereferencing 19 20 import ( 21 "context" 22 "encoding/json" 23 "errors" 24 "fmt" 25 "net/url" 26 27 "github.com/superseriousbusiness/activity/streams" 28 "github.com/superseriousbusiness/activity/streams/vocab" 29 "github.com/superseriousbusiness/gotosocial/internal/ap" 30 ) 31 32 // dereferenceCollectionPage returns the activitystreams CollectionPage at the specified IRI, or an error if something goes wrong. 33 func (d *deref) dereferenceCollectionPage(ctx context.Context, username string, pageIRI *url.URL) (ap.CollectionPageable, error) { 34 if blocked, err := d.state.DB.IsDomainBlocked(ctx, pageIRI.Host); blocked || err != nil { 35 return nil, fmt.Errorf("DereferenceCollectionPage: domain %s is blocked", pageIRI.Host) 36 } 37 38 transport, err := d.transportController.NewTransportForUsername(ctx, username) 39 if err != nil { 40 return nil, fmt.Errorf("DereferenceCollectionPage: error creating transport: %s", err) 41 } 42 43 b, err := transport.Dereference(ctx, pageIRI) 44 if err != nil { 45 return nil, fmt.Errorf("DereferenceCollectionPage: error deferencing %s: %s", pageIRI.String(), err) 46 } 47 48 m := make(map[string]interface{}) 49 if err := json.Unmarshal(b, &m); err != nil { 50 return nil, fmt.Errorf("DereferenceCollectionPage: error unmarshalling bytes into json: %s", err) 51 } 52 53 t, err := streams.ToType(ctx, m) 54 if err != nil { 55 return nil, fmt.Errorf("DereferenceCollectionPage: error resolving json into ap vocab type: %s", err) 56 } 57 58 if t.GetTypeName() != ap.ObjectCollectionPage { 59 return nil, fmt.Errorf("DereferenceCollectionPage: type name %s not supported", t.GetTypeName()) 60 } 61 62 p, ok := t.(vocab.ActivityStreamsCollectionPage) 63 if !ok { 64 return nil, errors.New("DereferenceCollectionPage: error resolving type as activitystreams collection page") 65 } 66 67 return p, nil 68 }