feat: crop max with and height (#13)

Author: fenos

config/config.go

@@ -39,6 +39,8 @@ var (
 	MaxAnimationFrames int
 	MaxSvgCheckBytes   int
 	MaxRedirects       int
+	CropMaxWidth       int
+	CropMaxHeight      int
 
 	JpegProgressive       bool
 	PngInterlaced         bool
@@ -383,6 +385,9 @@ func Configure() error {
 
 	configurators.Int(&MaxRedirects, "IMGPROXY_MAX_REDIRECTS")
 
+	configurators.Int(&CropMaxWidth, "IMGPROXY_CROP_MAX_WIDTH")
+	configurators.Int(&CropMaxHeight, "IMGPROXY_CROP_MAX_HEIGHT")
+
 	configurators.Patterns(&AllowedSources, "IMGPROXY_ALLOWED_SOURCES")
 
 	configurators.Bool(&SanitizeSvg, "IMGPROXY_SANITIZE_SVG")

processing/prepare.go

@@ -3,6 +3,7 @@ package processing
 import (
 	"math"
 
+	"github.com/imgproxy/imgproxy/v3/config"
 	"github.com/imgproxy/imgproxy/v3/imagedata"
 	"github.com/imgproxy/imgproxy/v3/imagetype"
 	"github.com/imgproxy/imgproxy/v3/imath"
@@ -45,6 +46,15 @@ func calcScale(width, height int, po *options.ProcessingOptions, imgtype imagety
 	var wshrink, hshrink float64
 
 	srcW, srcH := float64(width), float64(height)
+
+	if config.CropMaxWidth > 0 && srcW > float64(config.CropMaxWidth) {
+		po.Width = config.CropMaxWidth
+	}
+
+	if config.CropMaxHeight > 0 && srcH > float64(config.CropMaxHeight) {
+		po.Height = config.CropMaxHeight
+	}
+
 	dstW, dstH := float64(po.Width), float64(po.Height)
 
 	if po.Width == 0 {