Remove Metadata on RAW image

config/config.go

@@ -31,6 +31,7 @@ const (
   "IMG_MAP": {},
   "ALLOWED_TYPES": ["jpg","png","jpeg","bmp","svg","heic","nef"],
   "CONVERT_TYPES": ["webp","avif","jxl"],
+  "STRIP_METADATA": true,
   "ENABLE_EXTRA_PARAMS": false
   "READ_BUFFER_SIZE": 4096,
   "CONCURRENCY": 262144,
@@ -78,6 +79,7 @@ type WebpConfig struct {
 	EnableJXL  bool `json:"ENABLE_JXL"`
 
 	EnableExtraParams bool `json:"ENABLE_EXTRA_PARAMS"`
+	StripMetadata     bool `json:"STRIP_METADATA"`
 	ReadBufferSize    int  `json:"READ_BUFFER_SIZE"`
 	Concurrency       int  `json:"CONCURRENCY"`
 	DisableKeepalive  bool `json:"DISABLE_KEEPALIVE"`
@@ -100,6 +102,7 @@ func NewWebPConfig() *WebpConfig {
 		EnableJXL:  false,
 
 		EnableExtraParams: false,
+		StripMetadata:     true,
 		ReadBufferSize:    4096,
 		Concurrency:       262144,
 		DisableKeepalive:  false,
@@ -188,6 +191,16 @@ func LoadConfig() {
 			log.Warnf("WEBP_ENABLE_EXTRA_PARAMS is not a valid boolean, using value in config.json %t", Config.EnableExtraParams)
 		}
 	}
+	if os.Getenv("WEBP_STRIP_METADATA") != "" {
+		stripMetadata := os.Getenv("WEBP_STRIP_METADATA")
+		if stripMetadata == "true" {
+			Config.StripMetadata = true
+		} else if stripMetadata == "false" {
+			Config.StripMetadata = false
+		} else {
+			log.Warnf("WEBP_STRIP_METADATA is not a valid boolean, using value in config.json %t", Config.StripMetadata)
+		}
+	}
 	if os.Getenv("WEBP_IMG_MAP") != "" {
 		// TODO
 	}

encoder/encoder.go

@@ -189,13 +189,13 @@ func avifEncoder(img *vips.ImageRef, rawPath string, optimizedPath string) error
 	if quality >= 100 {
 		buf, _, err = img.ExportAvif(&vips.AvifExportParams{
 			Lossless:      true,
-			StripMetadata: true,
+			StripMetadata: config.Config.StripMetadata,
 		})
 	} else {
 		buf, _, err = img.ExportAvif(&vips.AvifExportParams{
 			Quality:       quality,
 			Lossless:      false,
-			StripMetadata: true,
+			StripMetadata: config.Config.StripMetadata,
 		})
 	}
 
@@ -227,15 +227,15 @@ func webpEncoder(img *vips.ImageRef, rawPath string, optimizedPath string) error
 		//   use_lossless_preset = 0;   // disable -z option
 		buf, _, err = img.ExportWebp(&vips.WebpExportParams{
 			Lossless:      true,
-			StripMetadata: true,
+			StripMetadata: config.Config.StripMetadata,
 		})
 	} else {
 		// If some special images cannot encode with default ReductionEffort(0), then retry from 0 to 6
 		// Example: https://github.com/webp-sh/webp_server_go/issues/234
 		ep := vips.WebpExportParams{
 			Quality:       quality,
 			Lossless:      false,
-			StripMetadata: true,
+			StripMetadata: config.Config.StripMetadata,
 		}
 		for i := range 7 {
 			ep.ReductionEffort = i

encoder/process.go

@@ -100,6 +100,9 @@ func ResizeItself(raw, dest string, extraParams config.ExtraParams) {
 		return
 	}
 	_ = resizeImage(img, extraParams)
+	if config.Config.StripMetadata {
+		img.RemoveMetadata()
+	}
 	buf, _, _ := img.ExportNative()
 	_ = os.WriteFile(dest, buf, 0600)
 	img.Close()