Add support for multiple certificates to targetproxy

pkg/cloudprovider/providers/gce/gce_targetproxy.go

@@ -85,10 +85,14 @@ func (gce *GCECloud) SetUrlMapForTargetHttpsProxy(proxy *compute.TargetHttpsProx
 }
 
 // SetSslCertificateForTargetHttpsProxy sets the given SslCertificate for the given TargetHttpsProxy.
-func (gce *GCECloud) SetSslCertificateForTargetHttpsProxy(proxy *compute.TargetHttpsProxy, sslCert *compute.SslCertificate) error {
+func (gce *GCECloud) SetSslCertificateForTargetHttpsProxy(proxy *compute.TargetHttpsProxy, sslCerts []*compute.SslCertificate) error {
 	mc := newTargetProxyMetricContext("set_ssl_cert")
+	var allCerts []string
+	for _, cert := range sslCerts {
+		allCerts = append(allCerts, cert.SelfLink)
+	}
 	req := &compute.TargetHttpsProxiesSetSslCertificatesRequest{
-		SslCertificates: []string{sslCert.SelfLink},
+		SslCertificates: allCerts,
 	}
 	return mc.Observe(gce.c.TargetHttpsProxies().SetSslCertificates(context.Background(), meta.GlobalKey(proxy.Name), req))
 }