/
decode.go
68 lines (59 loc) · 1.85 KB
/
decode.go
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package api
import (
"crypto/sha256"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"github.com/go-fed/httpsig"
"github.com/yukimochi/Activity-Relay/models"
)
func decodeActivity(request *http.Request) (*models.Activity, *models.Actor, []byte, error) {
request.Header.Set("Host", request.Host)
body, err := io.ReadAll(request.Body)
// Verify HTTPSignature
verifier, err := httpsig.NewVerifier(request)
if err != nil {
return nil, nil, nil, err
}
KeyID := verifier.KeyId()
keyOwnerActor := new(models.Actor)
err = keyOwnerActor.RetrieveRemoteActor(KeyID, fmt.Sprintf("%s (golang net/http; Activity-Relay %s; %s)", GlobalConfig.ServerServiceName(), version, GlobalConfig.ServerHostname().Host), ActorCache)
if err != nil {
return nil, nil, nil, err
}
PubKey, err := models.ReadPublicKeyRSAFromString(keyOwnerActor.PublicKey.PublicKeyPem)
if PubKey == nil {
return nil, nil, nil, errors.New("failed parse PublicKey from string")
}
if err != nil {
return nil, nil, nil, err
}
err = verifier.Verify(PubKey, httpsig.RSA_SHA256)
if err != nil {
return nil, nil, nil, err
}
// Verify Digest
givenDigest := request.Header.Get("Digest")
hash := sha256.New()
hash.Write(body)
b := hash.Sum(nil)
calculatedDigest := "SHA-256=" + base64.StdEncoding.EncodeToString(b)
if givenDigest != calculatedDigest {
return nil, nil, nil, errors.New("digest header is mismatch")
}
// Parse Activity
var activity models.Activity
err = json.Unmarshal(body, &activity)
if err != nil {
return nil, nil, nil, err
}
var remoteActor models.Actor
err = remoteActor.RetrieveRemoteActor(activity.Actor, fmt.Sprintf("%s (golang net/http; Activity-Relay %s; %s)", GlobalConfig.ServerServiceName(), version, GlobalConfig.ServerHostname().Host), ActorCache)
if err != nil {
return nil, nil, nil, err
}
return &activity, &remoteActor, body, nil
}