From 1a62f6755db996363819004ee56ad3544f614d24 Mon Sep 17 00:00:00 2001
From: Andreas Neue <an@dnix.de>
Date: Sat, 22 May 2021 20:58:57 +0200
Subject: [PATCH] Added blur method

---
 main.go | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/main.go b/main.go
index 03b40d0..f6df336 100644
--- a/main.go
+++ b/main.go
@@ -53,20 +53,23 @@ func transform(w http.ResponseWriter, r *http.Request) {
 
 	buf := []byte{}
 	errMsg := ""
-	errCode := 200
+	errCode := 0
 
 	switch method {
 	case "pass":
 		break
-		
+
 	case "resize":
 		buf, errMsg, errCode = doResize(resp.Body, args)
 		if buf == nil {
 			writeError(w, imgPath, method, errMsg, errCode)
 		}
 
-	case "thumbnail":
-		break
+	case "blur":
+		buf, errMsg, errCode = doBlur(resp.Body, args)
+		if buf == nil {
+			writeError(w, imgPath, method, errMsg, errCode)
+		}
 
 	default:
 		writeError(w, imgPath, method, "unknown method", http.StatusBadRequest)
@@ -133,6 +136,28 @@ func doResize(body io.ReadCloser, args string) ([]byte, string, int) {
 	return buf, "", 0
 }
 
+func doBlur(body io.ReadCloser, args string) ([]byte, string, int) {
+	// Convert width and heigh to integers
+	sigma, err := strconv.ParseFloat(args, 64)
+	if err != nil {
+		return nil, "invalid sigma", http.StatusInternalServerError
+	}
+	img, err := vips.NewImageFromReader(body)
+	if err != nil {
+		return nil, fmt.Sprintf("%v", err), http.StatusInternalServerError
+	}
+	err = img.GaussianBlur(sigma)
+	if err != nil {
+		return nil, fmt.Sprintf("%v", err), http.StatusInternalServerError
+	}
+	ep := vips.NewDefaultExportParams() // default export params are sufficient
+	buf, _, _ := img.Export(ep)
+	if err != nil {
+		return nil, fmt.Sprintf("%v", err), http.StatusInternalServerError
+	}
+	return buf, "", 0
+}
+
 func writeError(w http.ResponseWriter, imgPath, method, err string, status int) {
 	w.WriteHeader(status)
 	w.Write([]byte(fmt.Sprintf("Error [%s %s]: %s", method, imgPath, err)))