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package transport
import (
"context"
"crypto"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"sync"
"github.com/go-fed/activity/pub"
"github.com/go-fed/httpsig"
"github.com/sirupsen/logrus"
)
// Transport wraps the pub.Transport interface with some additional
// functionality for fetching remote media.
type Transport interface {
pub.Transport
DereferenceMedia(c context.Context, iri *url.URL, expectedContentType string) ([]byte, error)
// Finger performs a webfinger request with the given username and domain, and returns the bytes from the response body.
Finger(c context.Context, targetUsername string, targetDomains string) ([]byte, error)
}
// transport implements the Transport interface
type transport struct {
client pub.HttpClient
appAgent string
gofedAgent string
clock pub.Clock
pubKeyID string
privkey crypto.PrivateKey
sigTransport *pub.HttpSigTransport
getSigner httpsig.Signer
getSignerMu *sync.Mutex
log *logrus.Logger
}
func (t *transport) BatchDeliver(c context.Context, b []byte, recipients []*url.URL) error {
return t.sigTransport.BatchDeliver(c, b, recipients)
}
func (t *transport) Deliver(c context.Context, b []byte, to *url.URL) error {
l := t.log.WithField("func", "Deliver")
l.Debugf("performing POST to %s", to.String())
return t.sigTransport.Deliver(c, b, to)
}
func (t *transport) Dereference(c context.Context, iri *url.URL) ([]byte, error) {
l := t.log.WithField("func", "Dereference")
l.Debugf("performing GET to %s", iri.String())
return t.sigTransport.Dereference(c, iri)
}
func (t *transport) DereferenceMedia(c context.Context, iri *url.URL, expectedContentType string) ([]byte, error) {
l := t.log.WithField("func", "DereferenceMedia")
l.Debugf("performing GET to %s", iri.String())
req, err := http.NewRequest("GET", iri.String(), nil)
if err != nil {
return nil, err
}
req = req.WithContext(c)
if expectedContentType == "" {
req.Header.Add("Accept", "*/*")
} else {
req.Header.Add("Accept", expectedContentType)
}
req.Header.Add("Date", t.clock.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
req.Header.Add("User-Agent", fmt.Sprintf("%s %s", t.appAgent, t.gofedAgent))
req.Header.Set("Host", iri.Host)
t.getSignerMu.Lock()
err = t.getSigner.SignRequest(t.privkey, t.pubKeyID, req, nil)
t.getSignerMu.Unlock()
if err != nil {
return nil, err
}
resp, err := t.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("GET request to %s failed (%d): %s", iri.String(), resp.StatusCode, resp.Status)
}
return ioutil.ReadAll(resp.Body)
}
func (t *transport) Finger(c context.Context, targetUsername string, targetDomain string) ([]byte, error) {
l := t.log.WithField("func", "Finger")
urlString := fmt.Sprintf("https://%s/.well-known/webfinger?resource=acct:%s@%s", targetDomain, targetUsername, targetDomain)
l.Debugf("performing GET to %s", urlString)
iri, err := url.Parse(urlString)
if err != nil {
return nil, fmt.Errorf("Finger: error parsing url %s: %s", urlString, err)
}
l.Debugf("performing GET to %s", iri.String())
req, err := http.NewRequest("GET", iri.String(), nil)
if err != nil {
return nil, err
}
req = req.WithContext(c)
req.Header.Add("Accept", "application/json")
req.Header.Add("Accept", "application/jrd+json")
req.Header.Add("Date", t.clock.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
req.Header.Add("User-Agent", fmt.Sprintf("%s %s", t.appAgent, t.gofedAgent))
req.Header.Set("Host", iri.Host)
t.getSignerMu.Lock()
err = t.getSigner.SignRequest(t.privkey, t.pubKeyID, req, nil)
t.getSignerMu.Unlock()
if err != nil {
return nil, err
}
resp, err := t.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("GET request to %s failed (%d): %s", iri.String(), resp.StatusCode, resp.Status)
}
return ioutil.ReadAll(resp.Body)
}
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