Implement #527 resize image on upload (#538)

* resize image on upload

* #527 resize only if bigger than 500px

build.gradle

@@ -182,6 +182,7 @@ dependencies {
     compile 'de.danielbechler:java-object-diff:0.95'
     compile 'com.github.scribejava:scribejava-core:5.0.0'
     compile 'org.apache.poi:poi-ooxml:3.17'
+    compile 'org.imgscalr:imgscalr-lib:4.2'
 
     testCompile "org.springframework:spring-test:$springVersion"
     testCompile "com.insightfullogic:lambda-behave:0.3"

src/main/java/alfio/controller/api/admin/FileUploadApiController.java

@@ -18,12 +18,19 @@
 
 import alfio.manager.FileUploadManager;
 import alfio.model.modification.UploadBase64FileModification;
+import org.imgscalr.Scalr;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+
 import static org.springframework.web.bind.annotation.RequestMethod.POST;
 
 @RestController
@@ -38,8 +45,28 @@ public FileUploadApiController(FileUploadManager fileUploadManager) {
     }
 
     @RequestMapping(value = "/file/upload", method = POST)
-    public ResponseEntity<String> uploadFile(@RequestBody UploadBase64FileModification upload) {
+    public ResponseEntity<String> uploadFile(@RequestParam(required = false, value = "resizeImage", defaultValue = "false") boolean resizeImage,
+                                             @RequestBody UploadBase64FileModification upload) {
         try {
+
+            if (resizeImage) {
+                BufferedImage image = ImageIO.read(new ByteArrayInputStream(upload.getFile()));
+                //resize only if the image is bigger than 500px on one of the side
+                if(image.getWidth() > 500 || image.getHeight() > 500) {
+                    UploadBase64FileModification resized = new UploadBase64FileModification();
+                    BufferedImage thumbImg = Scalr.resize(image, Scalr.Method.QUALITY, Scalr.Mode.AUTOMATIC, 500, 500, Scalr.OP_ANTIALIAS);
+                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+                    ImageIO.write(thumbImg, "png", baos);
+
+                    resized.setFile(baos.toByteArray());
+                    resized.setAttributes(upload.getAttributes());
+                    resized.setName(upload.getName());
+                    resized.setType("image/png");
+                    upload = resized;
+                }
+            }
+
             return ResponseEntity.ok(fileUploadManager.insertFile(upload));
         } catch (Exception e) {
             return ResponseEntity.badRequest().build();

src/main/webapp/resources/js/admin/directive/admin-directive.js

@@ -450,7 +450,7 @@
                         $scope.$applyAsync(function() {
                             var imageBase64 = e.target.result;
                             $scope.imageBase64 = imageBase64;
-                            FileUploadService.upload({file : imageBase64.substring(imageBase64.indexOf('base64,') + 7), type : files[0].type, name : files[0].name}).success(function(imageId) {
+                            FileUploadService.uploadImageWithResize({file : imageBase64.substring(imageBase64.indexOf('base64,') + 7), type : files[0].type, name : files[0].name}).success(function(imageId) {
                                 $scope.obj.fileBlobId = imageId;
                             })
                         })

src/main/webapp/resources/js/admin/service/service.js

@@ -660,6 +660,10 @@
         return {
             upload : function(file) {
                 return $http['post']('/admin/api/file/upload', file).error(HttpErrorHandler.handle);
+            },
+
+            uploadImageWithResize: function(file) {
+                return $http['post']('/admin/api/file/upload?resizeImage=true', file).error(HttpErrorHandler.handle);
             }
         };
     });