proxy: send proxy version in user-agent header

proxy/pkg/server/api.go

@@ -3,6 +3,7 @@ package server
 import (
 	"crypto/sha512"
 	"encoding/hex"
+	"fmt"
 	"math/rand"
 	"net/http"
 	"net/url"
@@ -106,8 +107,7 @@ func getTLSTransport() http.RoundTripper {
 // NewAPIController initialise new API Controller instance from URL and API token
 func NewAPIController(pbURL url.URL, token string) *APIController {
 	transport := httptransport.New(pbURL.Host, client.DefaultBasePath, []string{pbURL.Scheme})
-
-	transport.Transport = getTLSTransport()
+	transport.Transport = SetUserAgent(getTLSTransport(), fmt.Sprintf("passbook-proxy@%s", pkg.VERSION))
 
 	// create the transport
 	auth := httptransport.BasicAuth("", token)

proxy/pkg/server/api_uag.go

@@ -0,0 +1,20 @@
+package server
+
+import "net/http"
+
+func SetUserAgent(inner http.RoundTripper, userAgent string) http.RoundTripper {
+	return &addUGA{
+		inner: inner,
+		Agent: userAgent,
+	}
+}
+
+type addUGA struct {
+	inner http.RoundTripper
+	Agent string
+}
+
+func (ug *addUGA) RoundTrip(r *http.Request) (*http.Response, error) {
+	r.Header.Set("User-Agent", ug.Agent)
+	return ug.inner.RoundTrip(r)
+}

proxy/pkg/server/api_ws.go

@@ -24,6 +24,7 @@ func (ac *APIController) initWS(pbURL url.URL, outpostUUID strfmt.UUID) {
 
 	header := http.Header{
 		"Authorization": []string{authHeader},
+		"User-Agent":    []string{fmt.Sprintf("passbook-proxy@%s", pkg.VERSION)},
 	}
 
 	value, set := os.LookupEnv("PASSBOOK_INSECURE")