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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 transport
import (
"crypto"
"fmt"
"github.com/go-fed/activity/pub"
"github.com/go-fed/httpsig"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/config"
)
// Controller generates transports for use in making federation requests to other servers.
type Controller interface {
NewTransport(pubKeyID string, privkey crypto.PrivateKey) (pub.Transport, error)
}
type controller struct {
config *config.Config
clock pub.Clock
client pub.HttpClient
appAgent string
}
// NewController returns an implementation of the Controller interface for creating new transports
func NewController(config *config.Config, clock pub.Clock, client pub.HttpClient, log *logrus.Logger) Controller {
return &controller{
config: config,
clock: clock,
client: client,
appAgent: fmt.Sprintf("%s %s", config.ApplicationName, config.Host),
}
}
// NewTransport returns a new http signature transport with the given public key id (a URL), and the given private key.
func (c *controller) NewTransport(pubKeyID string, privkey crypto.PrivateKey) (pub.Transport, error) {
prefs := []httpsig.Algorithm{httpsig.RSA_SHA256, httpsig.RSA_SHA512}
digestAlgo := httpsig.DigestSha256
getHeaders := []string{"(request-target)", "date"}
postHeaders := []string{"(request-target)", "date", "digest"}
getSigner, _, err := httpsig.NewSigner(prefs, digestAlgo, getHeaders, httpsig.Signature)
if err != nil {
return nil, fmt.Errorf("error creating get signer: %s", err)
}
postSigner, _, err := httpsig.NewSigner(prefs, digestAlgo, postHeaders, httpsig.Signature)
if err != nil {
return nil, fmt.Errorf("error creating post signer: %s", err)
}
return pub.NewHttpSigTransport(c.client, c.appAgent, c.clock, getSigner, postSigner, pubKeyID, privkey), nil
}
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