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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 transport
import (
"context"
"errors"
"net/http"
"net/url"
apiutil "code.superseriousbusiness.org/gotosocial/internal/api/util"
"code.superseriousbusiness.org/gotosocial/internal/config"
"code.superseriousbusiness.org/gotosocial/internal/db"
"code.superseriousbusiness.org/gotosocial/internal/gtserror"
"code.superseriousbusiness.org/gotosocial/internal/log"
)
func (t *transport) Dereference(ctx context.Context, iri *url.URL) (*http.Response, error) {
// If the request is to us, we can try to shortcut
// rather than going through the normal request flow.
//
// Only bail on a real error, otherwise continue
// to just make a normal http request to ourself.
if iri.Host == config.GetHost() {
rsp, err := t.controller.dereferenceLocal(ctx, iri)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
// Real error.
err := gtserror.Newf("error trying dereferenceLocal: %w", err)
return nil, err
}
if rsp != nil {
// Got something!
//
// No need for
// further business.
return rsp, nil
}
// Blast out a cheeky warning so we can keep track of this.
log.Warnf(ctx, "about to perform request to self: GET %s", iri)
}
// Build IRI just once
iriStr := iri.String()
// Prepare new HTTP request to endpoint
req, err := http.NewRequestWithContext(ctx, "GET", iriStr, nil)
if err != nil {
return nil, err
}
req.Header.Add("Accept", string(apiutil.AppActivityLDJSON)+","+string(apiutil.AppActivityJSON))
req.Header.Add("Accept-Charset", "utf-8")
// Perform the HTTP request
rsp, err := t.GET(req)
if err != nil {
return nil, err
}
// Ensure a non-error status response.
if rsp.StatusCode != http.StatusOK {
err := gtserror.NewFromResponse(rsp)
_ = rsp.Body.Close() // done with body
return nil, err
}
// Ensure that the incoming request content-type is expected.
if ct := rsp.Header.Get("Content-Type"); !apiutil.ASContentType(ct) {
err := gtserror.Newf("non activity streams response: %s", ct)
_ = rsp.Body.Close() // done with body
return nil, gtserror.SetMalformed(err)
}
return rsp, nil
}
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