71 lines
2.8 KiB
Go
71 lines
2.8 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 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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"io"
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"net/url"
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"sync"
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"github.com/go-fed/httpsig"
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"github.com/superseriousbusiness/activity/pub"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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)
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// Transport wraps the pub.Transport interface with some additional functionality for fetching remote media.
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//
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// Since the transport has the concept of 'shortcuts' for fetching data locally rather than remotely, it is
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// not *always* the case that calling a Transport function does an http call, but it usually will for remote
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// hosts or resources for which a shortcut isn't provided by the transport controller (also in this package).
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type Transport interface {
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pub.Transport
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// DereferenceMedia fetches the given media attachment IRI, returning the reader and filesize.
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DereferenceMedia(ctx context.Context, iri *url.URL) (io.ReadCloser, int, error)
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// DereferenceInstance dereferences remote instance information, first by checking /api/v1/instance, and then by checking /.well-known/nodeinfo.
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DereferenceInstance(ctx context.Context, iri *url.URL) (*gtsmodel.Instance, error)
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// Finger performs a webfinger request with the given username and domain, and returns the bytes from the response body.
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Finger(ctx context.Context, targetUsername string, targetDomains string) ([]byte, error)
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// SigTransport returns the underlying http signature transport wrapped by the GoToSocial transport.
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SigTransport() pub.Transport
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}
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// transport implements the Transport interface
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type transport struct {
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client pub.HttpClient
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appAgent string
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gofedAgent string
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clock pub.Clock
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pubKeyID string
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privkey crypto.PrivateKey
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sigTransport *pub.HttpSigTransport
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getSigner httpsig.Signer
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getSignerMu *sync.Mutex
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// shortcuts for dereferencing things that exist on our instance without making an http call to ourself
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dereferenceFollowersShortcut func(ctx context.Context, iri *url.URL) ([]byte, error)
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dereferenceUserShortcut func(ctx context.Context, iri *url.URL) ([]byte, error)
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}
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func (t *transport) SigTransport() pub.Transport {
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return t.sigTransport
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}
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