From 8ad5baee0ac859b7d5637281eebf11b12fc502db Mon Sep 17 00:00:00 2001
From: mschoen <marcelschoen@yahoo.com>
Date: Sat, 10 Sep 2022 13:49:56 +0200
Subject: [PATCH] Implementing drag-and-drop file upload.

---
 .../org/acme/FloppyImageUploadResource.java   |  89 ++++---
 .../resources/META-INF/resources/index.html   | 205 +++++++++++++++-
 .../META-INF/resources/jquery-3.6.1.min.js    |   2 +
 .../resources/META-INF/resources/retroio.css  | 218 ++++++++++++++++++
 4 files changed, 480 insertions(+), 34 deletions(-)
 create mode 100644 app/src/main/resources/META-INF/resources/jquery-3.6.1.min.js

diff --git a/app/src/main/java/org/acme/FloppyImageUploadResource.java b/app/src/main/java/org/acme/FloppyImageUploadResource.java
index 9b1d323..05e9a3e 100644
--- a/app/src/main/java/org/acme/FloppyImageUploadResource.java
+++ b/app/src/main/java/org/acme/FloppyImageUploadResource.java
@@ -51,54 +51,78 @@ public Response uploadFile(MultipartFormDataInput input) {
         File finalDir = new File(uploadDir, uuid);
         finalDir.mkdirs();
 
-        String fileName = "";
+        String fileName = null;
 
         Map<String, List<InputPart>> uploadForm = input.getFormDataMap();
-        List<InputPart> inputParts = uploadForm.get("uploadedFile");
+        boolean isAjax = uploadForm.containsKey("ajax");
+        for(String key : uploadForm.keySet()) {
+            System.out.println(">> KEY: " + key);
+            for(InputPart value : uploadForm.get(key)) {
+                System.out.println("-----> PART: ");
+                for(String header : value.getHeaders().keySet()) {
+                    System.out.println("------> header: " + header + ": " + value.getHeaders().get(key));
+                }
+            }
+        }
+        List<InputPart> inputParts = uploadForm.get("files[]");
 
         for (InputPart inputPart : inputParts) {
+            MultivaluedMap<String, String> header = inputPart.getHeaders();
+            fileName = getFileName(header);
+            if(fileName != null && !fileName.isEmpty()) {
+                break;
+            }
+        }
 
-            try {
-
-                MultivaluedMap<String, String> header = inputPart.getHeaders();
-                fileName = getFileName(header);
-                if (fileName.contains(".")) {
-
-                    File finalImageFile = new File(finalDir, fileName);
-                    ImageType imageType = ImageType.getTypeFromFile(finalImageFile);
-
-                    if (imageType != ImageType.unknown) {
+        if(fileName != null && fileName.contains(".")) {
+            File finalImageFile = new File(finalDir, fileName);
+            ImageType imageType = ImageType.getTypeFromFile(finalImageFile);
+            System.out.println("Image type: " + imageType.name());
+            if(imageType == ImageType.unknown) {
+                return Response.status(500).entity("Invalid/unsupported file format").build();
+            }
 
-                        // convert the uploaded file to inputstream
-                        InputStream inputStream = inputPart.getBody(InputStream.class, null);
+            try {
+                System.out.println("********** FILENAME: " + fileName);
+                for (InputPart inputPart : inputParts) {
+                    System.out.println("> process part...");
+                    MultivaluedMap<String, String> header = inputPart.getHeaders();
+
+                    // convert the uploaded file to inputstream
+                    InputStream inputStream = inputPart.getBody(InputStream.class, null);
+                    byte[] bytes = IOUtils.toByteArray(inputStream);
+                    writeFile(bytes, finalImageFile);
+                }
 
-                        byte[] bytes = IOUtils.toByteArray(inputStream);
 
-                        writeFile(bytes, finalImageFile);
+                File unpackDir = new File(finalDir, fileName + "-unpacked");
+                unpackDir.mkdirs();
 
-                        File unpackDir = new File(finalDir, fileName + "-unpacked");
-                        unpackDir.mkdirs();
+                ImageHandler imageHandler = ImageHandlerFactory.get(imageType);
+                VirtualDisk virtualDisk = imageHandler.loadImage(finalImageFile);
+                virtualDisk.exportToDirectory(unpackDir);
 
-                        ImageHandler imageHandler = ImageHandlerFactory.get(imageType);
-                        VirtualDisk virtualDisk = imageHandler.loadImage(finalImageFile);
-                        virtualDisk.exportToDirectory(unpackDir);
+                System.out.println("Done");
 
-                        System.out.println("Done");
+                URI uri = URI.create("/files/browse?path=" + uuid + "/" + unpackDir.getName() + "&image=" + fileName);
 
-                        URI uri = URI.create("/files/browse?path=" + uuid + "/" + unpackDir.getName() + "&image=" + fileName);
-                        return Response.status(302).location(uri).build();
+                System.out.println("------------- IS AJAX CLIENT: " + isAjax);
 
-                    }
+                if(!isAjax) {
+                    return Response.status(302).location(uri).build();
+                } else {
+                    return Response.status(200).entity("{ \"url\": \"" + uri + "\" }").build();
                 }
 
-                return Response.status(500).entity("Invalid/unsupported file format").build();
-
             } catch (Exception e) {
                 e.printStackTrace();
                 return Response.status(500).entity("Unknown error: " + e).build();
             }
-        }
 
+        } else {
+            System.err.println("------> Unable to find filename");
+        }
+System.err.println("------> FAILURE");
         return Response.status(500).entity("Upload failed.").build();
     }
 
@@ -117,11 +141,14 @@ private String getFileName(MultivaluedMap<String, String> header) {
 
                 String[] name = filename.split("=");
 
-                String finalFileName = name[1].trim().replaceAll("\"", "");
-                return finalFileName;
+                String finalFileName = name[1].trim().replaceAll("\"", "").trim();
+                if(!filename.isEmpty()) {
+                    System.out.println(">> Found filename: " + finalFileName);
+                    return finalFileName;
+                }
             }
         }
-        return "unknown";
+        return null;
     }
 
     //save to somewhere
diff --git a/app/src/main/resources/META-INF/resources/index.html b/app/src/main/resources/META-INF/resources/index.html
index b644d68..8c9ce6d 100644
--- a/app/src/main/resources/META-INF/resources/index.html
+++ b/app/src/main/resources/META-INF/resources/index.html
@@ -1,9 +1,13 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="en" class="no-js">
 <head>
     <meta charset="UTF-8">
     <title>RetroIO Floppy Image Loader</title>
     <link rel="stylesheet" href="retroio.css">
+
+    <!-- remove this if you use Modernizr -->
+    <script>(function(e,t,n){var r=e.querySelectorAll("html")[0];r.className=r.className.replace(/(^|\s)no-js(\s|$)/,"$1js$2")})(document,window,0);</script>
+
 </head>
 <body>
 <div style="margin: 30px;">
@@ -44,7 +48,7 @@ <h3>About</h3>
     </div>
 
     <h3>File Upload</h3>
-
+<!--
     <form action="/handler/upload" enctype="multipart/form-data" method="post">
 
         <p>
@@ -53,6 +57,201 @@ <h3>File Upload</h3>
 
         <input type="submit" value="Upload Image" />
     </form>
-</div>
+-->
+
+    <form method="post" action="/handler/upload" enctype="multipart/form-data" novalidate class="box">
+
+
+        <div class="box__input">
+            <input type="file" name="files[]" id="file" class="box__file" data-multiple-caption="{count} files selected" />
+            <label for="file"><strong>Choose a file</strong><span class="box__dragndrop"> or drag it here</span>.</label>
+            <button type="submit" class="box__button">Upload</button>
+        </div>
+
+
+        <div class="box__uploading">Uploading&hellip;</div>
+        <div class="box__success">Done! <a href="https://css-tricks.com/examples/DragAndDropFileUploading//?" class="box__restart" role="button">Upload more?</a></div>
+        <div class="box__error">Error! <span></span>. <a href="https://css-tricks.com/examples/DragAndDropFileUploading//?" class="box__restart" role="button">Try again!</a></div>
+    </form></div>
+
+
+
+<!--
+
+	JQUERY DEPENDENCY
+
+-->
+<script src="jquery-3.6.1.min.js"></script>
+<script>
+
+	'use strict';
+
+	;( function( $, window, document, undefined )
+	{
+		// feature detection for drag&drop upload
+
+		var isAdvancedUpload = function()
+			{
+				var div = document.createElement( 'div' );
+				return ( ( 'draggable' in div ) || ( 'ondragstart' in div && 'ondrop' in div ) ) && 'FormData' in window && 'FileReader' in window;
+			}();
+
+
+		// applying the effect for every form
+
+		$( '.box' ).each( function()
+		{
+			var $form		 = $( this ),
+				$input		 = $form.find( 'input[type="file"]' ),
+				$label		 = $form.find( 'label' ),
+				$errorMsg	 = $form.find( '.box__error span' ),
+				$restart	 = $form.find( '.box__restart' ),
+				droppedFiles = false,
+				showFiles	 = function( files )
+				{
+					$label.text( files.length > 1 ? ( $input.attr( 'data-multiple-caption' ) || '' ).replace( '{count}', files.length ) : files[ 0 ].name );
+				};
+
+			// letting the server side to know we are going to make an Ajax request
+			$form.append( '<input type="hidden" name="ajax" value="1" />' );
+
+			// automatically submit the form on file select
+			$input.on( 'change', function( e )
+			{
+				showFiles( e.target.files );
+
+
+				$form.trigger( 'submit' );
+
+
+			});
+
+
+			// drag&drop files if the feature is available
+			if( isAdvancedUpload )
+			{
+				$form
+				.addClass( 'has-advanced-upload' ) // letting the CSS part to know drag&drop is supported by the browser
+				.on( 'drag dragstart dragend dragover dragenter dragleave drop', function( e )
+				{
+					// preventing the unwanted behaviours
+					e.preventDefault();
+					e.stopPropagation();
+				})
+				.on( 'dragover dragenter', function() //
+				{
+					$form.addClass( 'is-dragover' );
+				})
+				.on( 'dragleave dragend drop', function()
+				{
+					$form.removeClass( 'is-dragover' );
+				})
+				.on( 'drop', function( e )
+				{
+					droppedFiles = e.originalEvent.dataTransfer.files; // the files that were dropped
+					showFiles( droppedFiles );
+
+
+					$form.trigger( 'submit' ); // automatically submit the form on file drop
+
+
+				});
+			}
+
+
+			// if the form was submitted
+
+			$form.on( 'submit', function( e )
+			{
+				// preventing the duplicate submissions if the current one is in progress
+				if( $form.hasClass( 'is-uploading' ) ) return false;
+
+				$form.addClass( 'is-uploading' ).removeClass( 'is-error' );
+
+				if( isAdvancedUpload ) // ajax file upload for modern browsers
+				{
+					e.preventDefault();
+
+					// gathering the form data
+					var ajaxData = new FormData( $form.get( 0 ) );
+					if( droppedFiles )
+					{
+						$.each( droppedFiles, function( i, file )
+						{
+							ajaxData.append( $input.attr( 'name' ), file );
+						});
+					}
+
+					// ajax request
+					$.ajax(
+					{
+						url: 			$form.attr( 'action' ),
+						type:			$form.attr( 'method' ),
+						data: 			ajaxData,
+						dataType:		'json',
+						cache:			false,
+						contentType:	false,
+						processData:	false,
+						complete: function()
+						{
+							$form.removeClass( 'is-uploading' );
+						},
+						success: function( data )
+						{
+                            window.location.href = data.url;
+						},
+						error: function()
+						{
+                            alert( 'Error. Please, contact the webmaster!' );
+                            /*
+                            if (data.redirect) {
+                                // data.redirect contains the string URL to redirect to
+                                alert( 'Redirect to:' + data.redirect );
+                                window.location.href = data.redirect;
+                            } else {
+                                alert( 'Error. Please, contact the webmaster!' );
+                            }
+                             */
+						}
+					});
+				}
+				else // fallback Ajax solution upload for older browsers
+				{
+					var iframeName	= 'uploadiframe' + new Date().getTime(),
+						$iframe		= $( '<iframe name="' + iframeName + '" style="display: none;"></iframe>' );
+
+					$( 'body' ).append( $iframe );
+					$form.attr( 'target', iframeName );
+
+					$iframe.one( 'load', function()
+					{
+						var data = $.parseJSON( $iframe.contents().find( 'body' ).text() );
+						$form.removeClass( 'is-uploading' ).addClass( data.success == true ? 'is-success' : 'is-error' ).removeAttr( 'target' );
+						if( !data.success ) $errorMsg.text( data.error );
+						$iframe.remove();
+					});
+				}
+			});
+
+
+			// restart the form if has a state of error/success
+
+			$restart.on( 'click', function( e )
+			{
+				e.preventDefault();
+				$form.removeClass( 'is-error is-success' );
+				$input.trigger( 'click' );
+			});
+
+			// Firefox focus bug fix for file input
+			$input
+			.on( 'focus', function(){ $input.addClass( 'has-focus' ); })
+			.on( 'blur', function(){ $input.removeClass( 'has-focus' ); });
+		});
+
+	})( jQuery, window, document );
+
+</script>
+
 </body>
 </html>
diff --git a/app/src/main/resources/META-INF/resources/jquery-3.6.1.min.js b/app/src/main/resources/META-INF/resources/jquery-3.6.1.min.js
new file mode 100644
index 0000000..2c69bc9
--- /dev/null
+++ b/app/src/main/resources/META-INF/resources/jquery-3.6.1.min.js
@@ -0,0 +1,2 @@
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diff --git a/app/src/main/resources/META-INF/resources/retroio.css b/app/src/main/resources/META-INF/resources/retroio.css
index 1e675a7..82d40bb 100644
--- a/app/src/main/resources/META-INF/resources/retroio.css
+++ b/app/src/main/resources/META-INF/resources/retroio.css
@@ -1,3 +1,221 @@
+
+.container
+{
+    width: 100%;
+    max-width: 680px; /* 800 */
+    text-align: center;
+    margin: 0 auto;
+}
+
+.container h1
+{
+    font-size: 42px;
+    font-weight: 300;
+    color: #0f3c4b;
+    margin-bottom: 40px;
+}
+.container h1 a:hover,
+.container h1 a:focus
+{
+    color: #39bfd3;
+}
+
+.container nav
+{
+    margin-bottom: 40px;
+}
+.container nav a
+{
+    border-bottom: 2px solid #c8dadf;
+    display: inline-block;
+    padding: 4px 8px;
+    margin: 0 5px;
+}
+.container nav a.is-selected
+{
+    font-weight: 700;
+    color: #39bfd3;
+    border-bottom-color: currentColor;
+}
+.container nav a:not( .is-selected ):hover,
+.container nav a:not( .is-selected ):focus
+{
+    border-bottom-color: #0f3c4b;
+}
+
+.container footer
+{
+    color: #92b0b3;
+    margin-top: 40px;
+}
+.container footer p + p
+{
+    margin-top: 1em;
+}
+.container footer a:hover,
+.container footer a:focus
+{
+    color: #39bfd3;
+}
+
+.box
+{
+    font-size: 1.25rem; /* 20 */
+    background-color: #c8dadf;
+    position: relative;
+    padding: 100px 20px;
+}
+.box.has-advanced-upload
+{
+    outline: 2px dashed #92b0b3;
+    outline-offset: -10px;
+
+    -webkit-transition: outline-offset .15s ease-in-out, background-color .15s linear;
+    transition: outline-offset .15s ease-in-out, background-color .15s linear;
+}
+.box.is-dragover
+{
+    outline-offset: -20px;
+    outline-color: #c8dadf;
+    background-color: #fff;
+}
+.box__dragndrop,
+.box__icon
+{
+    display: none;
+}
+.box.has-advanced-upload .box__dragndrop
+{
+    display: inline;
+}
+.box.has-advanced-upload .box__icon
+{
+    width: 100%;
+    height: 80px;
+    fill: #92b0b3;
+    display: block;
+    margin-bottom: 40px;
+}
+
+.box.is-uploading .box__input,
+.box.is-success .box__input,
+.box.is-error .box__input
+{
+    visibility: hidden;
+}
+
+.box__uploading,
+.box__success,
+.box__error
+{
+    display: none;
+}
+.box.is-uploading .box__uploading,
+.box.is-success .box__success,
+.box.is-error .box__error
+{
+    display: block;
+    position: absolute;
+    top: 50%;
+    right: 0;
+    left: 0;
+
+    -webkit-transform: translateY( -50% );
+    transform: translateY( -50% );
+}
+.box__uploading
+{
+    font-style: italic;
+}
+.box__success
+{
+    -webkit-animation: appear-from-inside .25s ease-in-out;
+    animation: appear-from-inside .25s ease-in-out;
+}
+@-webkit-keyframes appear-from-inside
+{
+    from	{ -webkit-transform: translateY( -50% ) scale( 0 ); }
+    75%		{ -webkit-transform: translateY( -50% ) scale( 1.1 ); }
+    to		{ -webkit-transform: translateY( -50% ) scale( 1 ); }
+}
+@keyframes appear-from-inside
+{
+    from	{ transform: translateY( -50% ) scale( 0 ); }
+    75%		{ transform: translateY( -50% ) scale( 1.1 ); }
+    to		{ transform: translateY( -50% ) scale( 1 ); }
+}
+
+.box__restart
+{
+    font-weight: 700;
+}
+.box__restart:focus,
+.box__restart:hover
+{
+    color: #39bfd3;
+}
+
+.js .box__file
+{
+    width: 0.1px;
+    height: 0.1px;
+    opacity: 0;
+    overflow: hidden;
+    position: absolute;
+    z-index: -1;
+}
+.js .box__file + label
+{
+    max-width: 80%;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    cursor: pointer;
+    display: inline-block;
+    overflow: hidden;
+}
+.js .box__file + label:hover strong,
+.box__file:focus + label strong,
+.box__file.has-focus + label strong
+{
+    color: #39bfd3;
+}
+.js .box__file:focus + label,
+.js .box__file.has-focus + label
+{
+    outline: 1px dotted #000;
+    outline: -webkit-focus-ring-color auto 5px;
+}
+.js .box__file + label *
+{
+    /* pointer-events: none; */ /* in case of FastClick lib use */
+}
+
+.no-js .box__file + label
+{
+    display: none;
+}
+
+.no-js .box__button
+{
+    display: block;
+}
+.box__button
+{
+    font-weight: 700;
+    color: #e5edf1;
+    background-color: #39bfd3;
+    display: none;
+    padding: 8px 16px;
+    margin: 40px auto 0;
+}
+.box__button:hover,
+.box__button:focus
+{
+    background-color: #0f3c4b;
+}
+
+/* ----------------------------------------------------------------- */
+
 body {
     margin: 0;
     font-family: "Segoe UI",Arial,sans-serif;