Add optional secure headers to responses

cmd/whatismyip.go

@@ -17,6 +17,7 @@ import (
 	"github.com/dcarrillo/whatismyip/router"
 
 	"github.com/gin-gonic/gin"
+	"github.com/unrolled/secure"
 )
 
 var (
@@ -138,6 +139,28 @@ func setupEngine() {
 	engine = gin.New()
 	engine.Use(gin.LoggerWithFormatter(httputils.GetLogFormatter))
 	engine.Use(gin.Recovery())
+	if setting.App.EnableSecureHeaders {
+		engine.Use(addSecureHeaders())
+	}
 	_ = engine.SetTrustedProxies(nil)
 	engine.TrustedPlatform = setting.App.TrustedHeader
 }
+
+func addSecureHeaders() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		err := secure.New(secure.Options{
+			BrowserXssFilter:   true,
+			ContentTypeNosniff: true,
+			FrameDeny:          true,
+		}).Process(c.Writer, c.Request)
+		if err != nil {
+			c.Abort()
+			return
+		}
+
+		// Avoid header rewrite if response is a redirection.
+		if status := c.Writer.Status(); status > 300 && status < 399 {
+			c.Abort()
+		}
+	}
+}