Initial QSfera import

Server/pkg/middleware/version.go

@@ -0,0 +1,21 @@
+package middleware
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// Version writes the current version to the headers.
+func Version(name, version string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Header().Set(
+				fmt.Sprintf("X-%s-VERSION", strings.ToUpper(name)),
+				version,
+			)
+
+			next.ServeHTTP(w, r)
+		})
+	}
+}