112 lines
3.7 KiB
Go
112 lines
3.7 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package transport
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import (
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"context"
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"crypto"
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"fmt"
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"sync"
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"github.com/go-fed/activity/pub"
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"github.com/go-fed/httpsig"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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)
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// Controller generates transports for use in making federation requests to other servers.
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type Controller interface {
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NewTransport(pubKeyID string, privkey crypto.PrivateKey) (Transport, error)
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NewTransportForUsername(ctx context.Context, username string) (Transport, error)
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}
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type controller struct {
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config *config.Config
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db db.DB
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clock pub.Clock
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client pub.HttpClient
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appAgent string
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}
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// NewController returns an implementation of the Controller interface for creating new transports
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func NewController(config *config.Config, db db.DB, clock pub.Clock, client pub.HttpClient) Controller {
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return &controller{
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config: config,
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db: db,
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clock: clock,
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client: client,
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appAgent: fmt.Sprintf("%s %s", config.ApplicationName, config.Host),
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}
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}
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// NewTransport returns a new http signature transport with the given public key id (a URL), and the given private key.
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func (c *controller) NewTransport(pubKeyID string, privkey crypto.PrivateKey) (Transport, error) {
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prefs := []httpsig.Algorithm{httpsig.RSA_SHA256}
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digestAlgo := httpsig.DigestSha256
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getHeaders := []string{httpsig.RequestTarget, "host", "date"}
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postHeaders := []string{httpsig.RequestTarget, "host", "date", "digest"}
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getSigner, _, err := httpsig.NewSigner(prefs, digestAlgo, getHeaders, httpsig.Signature, 120)
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if err != nil {
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return nil, fmt.Errorf("error creating get signer: %s", err)
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}
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postSigner, _, err := httpsig.NewSigner(prefs, digestAlgo, postHeaders, httpsig.Signature, 120)
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if err != nil {
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return nil, fmt.Errorf("error creating post signer: %s", err)
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}
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sigTransport := pub.NewHttpSigTransport(c.client, c.appAgent, c.clock, getSigner, postSigner, pubKeyID, privkey)
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return &transport{
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client: c.client,
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appAgent: c.appAgent,
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gofedAgent: "(go-fed/activity v1.0.0)",
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clock: c.clock,
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pubKeyID: pubKeyID,
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privkey: privkey,
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sigTransport: sigTransport,
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getSigner: getSigner,
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getSignerMu: &sync.Mutex{},
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}, nil
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}
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func (c *controller) NewTransportForUsername(ctx context.Context, username string) (Transport, error) {
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// We need an account to use to create a transport for dereferecing something.
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// If a username has been given, we can fetch the account with that username and use it.
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// Otherwise, we can take the instance account and use those credentials to make the request.
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var u string
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if username == "" {
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u = c.config.Host
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} else {
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u = username
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}
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ourAccount, err := c.db.GetLocalAccountByUsername(ctx, u)
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if err != nil {
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return nil, fmt.Errorf("error getting account %s from db: %s", username, err)
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}
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transport, err := c.NewTransport(ourAccount.PublicKeyURI, ourAccount.PrivateKey)
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if err != nil {
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return nil, fmt.Errorf("error creating transport for user %s: %s", username, err)
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}
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return transport, nil
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}
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