feat(kube): use local kubectl for all deployments (#5488)

api/http/proxy/factory/agent/transport.go

@@ -0,0 +1,39 @@
+package agent
+
+import (
+	"net/http"
+
+	portainer "github.com/portainer/portainer/api"
+)
+
+type (
+	// Transport is an http.Transport wrapper that adds custom http headers to communicate to an Agent
+	Transport struct {
+		httpTransport      *http.Transport
+		signatureService   portainer.DigitalSignatureService
+		endpointIdentifier portainer.EndpointID
+	}
+)
+
+// NewTransport returns a new transport that can be used to send signed requests to a Portainer agent
+func NewTransport(signatureService portainer.DigitalSignatureService, httpTransport *http.Transport) *Transport {
+	transport := &Transport{
+		httpTransport:    httpTransport,
+		signatureService: signatureService,
+	}
+
+	return transport
+}
+
+// RoundTrip is the implementation of the the http.RoundTripper interface
+func (transport *Transport) RoundTrip(request *http.Request) (*http.Response, error) {
+	signature, err := transport.signatureService.CreateSignature(portainer.PortainerAgentSignatureMessage)
+	if err != nil {
+		return nil, err
+	}
+
+	request.Header.Set(portainer.PortainerAgentPublicKeyHeader, transport.signatureService.EncodedPublicKey())
+	request.Header.Set(portainer.PortainerAgentSignatureHeader, signature)
+
+	return transport.httpTransport.RoundTrip(request)
+}