fix: certificate hash encoding during lookup

Author: subnova

gateway/registry/remote.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strings"
 )
 
 type RemoteRegistry struct {
@@ -59,6 +60,9 @@ type CertificateResponse struct {
 }
 
 func (r RemoteRegistry) LookupCertificate(certHash string) (*x509.Certificate, error) {
+	certHash = strings.Replace(certHash, "/", "_", -1)
+	certHash = strings.Replace(certHash, "-", "+", -1)
+
 	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v0/certificate/%s", r.ManagerApiAddr, certHash), nil)
 	if err != nil {
 		return nil, fmt.Errorf("creating http request: %w", err)