doc: changelog

.hgtags

@@ -0,0 +1,2 @@
+e2250a7fd29052ea767f18e1459cabea4cd7efd3 release-1.0.0
+b8975b9e75648a7c2a5003c67db92cf2216e01c0 release-1.0.1

Makefile

@@ -2,7 +2,7 @@
 # Makefile for contented
 #
 
-VERSION:=1.0.0
+VERSION:=1.1.0
 
 SOURCES:=Makefile \
 	static \

Server.go

@@ -20,9 +20,11 @@ type ServerPublicProperties struct {
 }
 
 type ServerOptions struct {
-	DataDirectory  string
+	DataDirectory      string
-	DBPath         string
+	DBPath             string
-	BandwidthLimit int64
+	BandwidthLimit     int64
+	TrustXForwardedFor bool
+	EnableHomepage     bool
 	ServerPublicProperties
 }
 
@@ -75,7 +77,13 @@ func (this *Server) handleAbout(w http.ResponseWriter) {
 	this.serveJsonObject(w, this.opts.ServerPublicProperties)
 }
 
-func remoteIP(r *http.Request) string {
+func (this *Server) remoteIP(r *http.Request) string {
+	if this.opts.TrustXForwardedFor {
+		if xff := r.Header.Get("X-Forwarded-For"); len(xff) > 0 {
+			return xff
+		}
+	}
+
 	return strings.TrimRight(strings.TrimRight(r.RemoteAddr, "0123456789"), ":")
 }
 
@@ -86,6 +94,7 @@ const (
 
 func (this *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set(`Server`, SERVER_HEADER)
+	w.Header().Set(`Access-Control-Allow-Origin`, `*`) // Blanket allow CORS
 	if this.opts.MaxUploadBytes > 0 {
 		r.Body = http.MaxBytesReader(w, r.Body, this.opts.MaxUploadBytes)
 	}
@@ -108,11 +117,13 @@ func (this *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		this.handleUpload(w, r)
 
 	} else if r.Method == "OPTIONS" {
-		// Blanket allow
+		// Blanket allow (headers already set)
-		w.Header().Set(`Access-Control-Allow-Origin`, `*`)
 		w.WriteHeader(200)
 
-	} else if static, err := Asset(r.URL.Path[1:]); err == nil && r.Method == "GET" {
+	} else if r.Method == "GET" && r.URL.Path == `/` && this.opts.EnableHomepage {
+		http.Redirect(w, r, `/index.html`, http.StatusFound)
+
+	} else if static, err := Asset(r.URL.Path[1:]); err == nil && r.Method == "GET" && (this.opts.EnableHomepage || r.URL.Path != `/index.html`) {
 		http.ServeContent(w, r, r.URL.Path[1:], this.startTime, bytes.NewReader(static))
 
 	} else {

TODO.txt

@@ -8,6 +8,6 @@ TODO
 
 - Nicer preview page after uploading
 
-- Option to disable manual uploading from the landing page
-
 - Gallery preview (multiple element hashid)
+
+- Prevent selecting around the toggle buttons (firefox for android)

_dist/README.txt

@@ -6,9 +6,11 @@ You can use contented as a standalone upload server, or you can use the SDK to e
 
 =FEATURES=
 
-- Drag and drop uploader, or fallback classic uploader, or pastebin-style uploader
+- Drag and drop upload
 - Multiple files upload
 - Pastebin upload
+- Custom drawing upload ([url=https://github.com/Leimi/drawingboard.js]via[/url])
+- Ctrl-V upload
 - SDK-oriented design for embedding, including CORS support
 - Mobile friendly HTML interface
 - Preserves uploaded filename and content-type metadata
@@ -24,6 +26,8 @@ You can use contented as a standalone upload server, or you can use the SDK to e
         Directory for stored content (default "")
   -db string
         Path for metadata database (default "contented.db")
+  -enableHomepage
+        Enable homepage (disable for embedded use only) (default true)
   -listen string
          (default "127.0.0.1:80")
   -max int
@@ -32,8 +36,12 @@ You can use contented as a standalone upload server, or you can use the SDK to e
         Maximum upload speed in bytes/sec (set zero for unlimited)
   -title string
         Title used in web interface (default "contented")
+  -trustXForwardedFor
+        Trust X-Forwarded-For reverse proxy headers
 `
 
+If you are hosting behind a reverse proxy, remember to set its post body size parameter appropriately (e.g. `client_max_body_size` for nginx).
+
 =USAGE (HTTP)=
 
 The server responds on the following URLs:
@@ -44,18 +52,31 @@ The server responds on the following URLs:
 
 =USAGE (EMBEDDING FOR WEB)=
 
-Your webpage should load the SDK from the contented server, then call the `contented.init` function to display the upload widget over the top of an existing DOM element.
+Your webpage should load the SDK from the contented server, then call the `contented.init` function to display the upload widget over the top of an existing DOM element. Your callback will be passed an array of file IDs of any uploaded items.
 
-The SDK will run your callback, passing it the file IDs of any uploaded items.
+`<script type="text/javascript" src="SERVER_ADDR/sdk.js"></script>
-
-The SDK depends on jQuery.
-
-`
-<script type="text/javascript" src="SERVER_ADDR/sdk.js"></script>
 contented.init("#target", function(/* String[] */ items) {});
 `
 
 =CHANGELOG=
 
+2017-10-15: 1.1.0
+- Feature: Drawing mode
+- Feature: Ctrl+V image upload
+- Feature: Option to trust X-Forwarded-For headers when using a reverse proxy
+- Feature: Add `getDownloadURL`, `getInfoJSONURL`, `getPreviewURL` SDK methods
+- Feature: Option to disable uploading via the homepage
+- Feature: Add button to repeat when uploading from homepage
+- Enhancement: Automatically load library dependencies
+- Enhancement: Display homepage widget using the full screen size
+- Include drawingboard.js 0.4.6 (MIT license)
+- Fix a cosmetic issue with javascript console output
+- Fix a cosmetic issue with error messages if an upload failed
+
+2017-10-08: 1.0.1
+- Fix an issue with CORS preflight requests
+- Fix an issue with index URLs
+
 2017-10-08: 1.0.0
 - Initial public release
+- Include jQuery 1.12.4 (MIT license)

cmd/contented/main.go

@@ -18,13 +18,17 @@ func main() {
 	appTitle := flag.String("title", "contented", "Title used in web interface")
 	maxUploadMb := flag.Int("max", 8, "Maximum size of uploaded files in MiB (set zero for unlimited)")
 	maxUploadSpeed := flag.Int("speed", 0, "Maximum upload speed in bytes/sec (set zero for unlimited)")
+	trustXForwardedFor := flag.Bool("trustXForwardedFor", false, "Trust X-Forwarded-For reverse proxy headers")
+	enableHomepage := flag.Bool("enableHomepage", true, "Enable homepage (disable for embedded use only)")
 
 	flag.Parse()
 
 	svr, err := contented.NewServer(&contented.ServerOptions{
-		DataDirectory:  *dataDir,
+		DataDirectory:      *dataDir,
-		DBPath:         *dbPath,
+		DBPath:             *dbPath,
-		BandwidthLimit: int64(*maxUploadSpeed),
+		BandwidthLimit:     int64(*maxUploadSpeed),
+		TrustXForwardedFor: *trustXForwardedFor,
+		EnableHomepage:     *enableHomepage,
 		ServerPublicProperties: contented.ServerPublicProperties{
 			AppTitle:       *appTitle,
 			MaxUploadBytes: int64(*maxUploadMb) * 1024 * 1024,

download.go

@@ -10,7 +10,7 @@ import (
 func (this *Server) handleView(w http.ResponseWriter, r *http.Request, fileID string) {
 	err := this.handleViewInternal(w, r, r.URL.Path[len(downloadUrlPrefix):])
 	if err != nil {
-		log.Printf("%s View failed: %s\n", r.RemoteAddr, err.Error())
+		log.Printf("%s View failed: %s\n", this.remoteIP(r), err.Error())
 		if os.IsNotExist(err) {
 			http.Error(w, "File not found", 404)
 		} else {

static/index.html

@@ -7,9 +7,23 @@
 		<style type="text/css">
 html, body {
 	font-family: sans-serif;
+	margin:0;
+	width:100%;
+	height:100%;
+}
+#padder {
+	height:100%;
+	position:relative;
 }
 #surrogate-area {
-    height:300px;
+    position:absolute;
+    top:10px;
+    bottom:10px;
+    left:10px;
+    right:10px;
+}
+button.again {
+	margin-top:2em;
 }
 /* hide close button */
 .contented-close {
@@ -18,9 +32,11 @@ html, body {
 		</style>
 	</head>
 	<body>
-        <div id="surrogate-area">
+		<div id="padder">
-            Loading...
+			<div id="surrogate-area">
-        </div>
+				Loading...
+			</div>
+		</div>
         
         <script type="text/javascript" src="/jquery-1.12.4.min.js"></script>
 		<script type="text/javascript" src="/sdk.js"></script>
@@ -45,11 +61,16 @@ contented.init("#surrogate-area", function(items) {
     for (var i = 0; i < items.length; ++i) {
         $table.append($("<tr>").append([
             $("<td>").text(items[i]),
-            $("<td>").html("<a target='_blank' href='/get/" + items[i] + "'>get</a>"),
+            $("<td>").html("<a target='_blank' href='" + contented.getDownloadURL(items[i]) + "'>get</a>"),
-            $("<td>").html("<a target='_blank' href='/info/" + items[i] + "'>info</a>")
+            $("<td>").html("<a target='_blank' href='" + contented.getInfoJSONURL(items[i]) + "'>info</a>"),
         ]))
     }
-    $("#surrogate-area").html($table);
+    $("#surrogate-area").html([
+		$table,
+		$("<button>").addClass("again").text("Again...").click(function() {
+			window.location.href = window.location.href;
+		}),
+	]);
 
 });
 		</script>

static/sdk.js

@@ -1,214 +1,29 @@
 ;
-var contented = (function ($, currentScriptPath) {
-    "use strict";
 
-    var baseURL = currentScriptPath.replace('sdk.js', '');
+//
 
-    var formatBytes = function(bytes) {
+var contented = (function() {
-        if (bytes < 1024) {
+	"use strict";
-            return bytes + " B";
+	
-        } else if (bytes < (1024*1024)) {
+	// @ref https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob 
-            return (bytes / 1024).toFixed(1) + " KiB";
+	if (!HTMLCanvasElement.prototype.toBlob) {
-        } else if (bytes < (1024*1024*1024)) {
+		Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
-            return (bytes / (1024*1024)).toFixed(1) + " MiB";
+			value: function (callback, type, quality) {
-        } else {
-            return (bytes / (1024*1024*1024)).toFixed(1) + " GiB";
-        }
-    };
 
-    /**
+				var binStr = atob( this.toDataURL(type, quality).split(',')[1] ),
-     * supportsDrop returns whether drag-and-drop is supported by this browser.
+					len = binStr.length,
-     *
+					arr = new Uint8Array(len);
-     * @return bool
-     */
-    var supportsDrop = function () {
-        return ('ondrop' in window && 'FormData' in window && 'FileReader' in window);
-    }
 
-    /**
+				for (var i = 0; i < len; i++ ) {
-     * initArea shows the contented upload widget over the top of a target DOM element.
+					arr[i] = binStr.charCodeAt(i);
-     *
+				}
-     * @param any        element       Drop target (string selector / DOMElement / jQuery)
-     * @param Function   onUploaded    Called with an array of upload IDs
-     * @param Function   onClose       Called when the widget is being destroyed
-     */
-    var initArea = function (elementSelector, onUploaded, onClose) {
-        onUploaded = onUploaded || function () { };
-        onClose = onClose || function () { };
 
-        if ($(elementSelector).length != 1) {
+				callback( new Blob( [arr], {type: type || 'image/png'} ) );
-            return; // should only find one element
+			}
-        }
+		});
-        var element = $(elementSelector)[0];
+	}
-
-        // <input type="hidden" name="MAX_FILE_SIZE" value="` + ret.MaxUploadBytes + `" /> 
-
-        // Create a new div for ourselves on top of the existing area
-        $.get(baseURL + "about", function (ret) {
-            
-            var extraText = "";
-            if (ret.MaxUploadBytes > 0) {
-                extraText = " (max " + formatBytes(ret.MaxUploadBytes) + ")";
-            }
-
-            $.get(baseURL + "widget.html", function (widgetHtml) {
-
-                var $f = $("<div>").html(widgetHtml);
-                $f.find(".contented-extratext").text(extraText);
-
-                var ourClose = function () {
-                    $f.remove(); // remove from dom
-                    onClose(); // upstream close
-                };
-                $f.find(".contented-close").click(function () {
-                    ourClose();
-                })
-
-                var setType = function (type) {
-                    $f.find(".contented-upload-type").removeClass("contented-upload-type-active");
-                    $f.find(".contented-upload-type[data-upload-type=" + type + "]").addClass("contented-upload-type-active");
-
-                    $f.find(".contented-upload-if").removeClass("contented-active");
-                    $f.find(".contented-if-" + type).addClass("contented-active");
-                };
-
-                $f.find(".contented-upload-type").click(function () {
-                    setType($(this).attr('data-upload-type'));
-                });
-
-                if (!supportsDrop()) {
-                    // switch default
-                    setType('file');
-                }
-
-                //
-
-                var $element = $(element);
-                var offset = $element.offset();
-
-                $f.css({
-                    'position': 'absolute',
-                    'left': offset.left + "px",
-                    'top': offset.top + "px",
-                    'width': $element.width() + "px",
-                    'min-width': $element.width() + "px",
-                    'max-width': $element.width() + "px",
-                    'height': $element.height() + "px",
-                    'min-height': $element.height() + "px",
-                    'max-height': $element.height() + "px"
-                });
-
-                $f.find('.contented').on('dragover dragenter', function (e) {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    $(this).addClass('is-dragging');
-                });
-
-                $f.find('.contented').on('dragleave dragend', function (e) {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    $(this).removeClass('is-dragging');
-                });
-
-                $f.find('.contented').on('drop', function (e) {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    handleUploadFrom(e.originalEvent.dataTransfer.files);
-                });
-
-                $f.find('.contented-file-upload').on('click', function(e) {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    handleUploadFrom($(".contented-file-selector")[0].files);
-                });
-
-                $f.find('.contented-paste-upload').on('click', function(e) {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    var blob = new Blob([$(".contented-if-paste textarea").val()], {type : 'text/plain'});
-                    handleUploadFrom([blob]);
-                });
-
-                $("body").append($f);
-
-                var setProgressCaption = function(message) {
-                    $f.find(".contented-if-progress label").text(message);
-                };
-                var setProgressPercentage = function(frc) {
-                    $f.find(".contented-progress-element").css('width', (frc * 100) + "%");
-                };
-
-                var handleUploadFrom = function (files) {
-
-                    setProgressCaption("Uploading, please wait...");
-                    setProgressPercentage(0);
-                    setType("progress");
-
-                    $f.find(".contented-upload-type-selector").hide();
-                    $f.find(".contented").removeClass('is-dragging');
-
-                    // Ajax uploader
-                    var ajaxData = new FormData();
-                    for (var i = 0; i < files.length; ++i) {
-                        ajaxData.append("f", files[i]);
-                    }
-
-                    // ajax request
-                    $.ajax({
-                        url: baseURL + "upload",
-                        type: "POST",
-                        data: ajaxData,
-                        dataType: 'json', // response type
-                        cache: false,
-                        contentType: false,
-                        processData: false,
-                        xhr: function() {
-                            var xhr = $.ajaxSettings.xhr();
-                            xhr.upload.addEventListener(
-                                'progress',
-                                function(ev) {
-                                    console.log([ev.lengthComputable, ev.loaded, ev.total]);
-                                    if (ev.lengthComputable) {
-                                        setProgressCaption("Uploading (" + formatBytes(ev.loaded) + " / " + formatBytes(ev.total) + ")...");
-                                        setProgressPercentage(ev.total == 0 ? 0 : ev.loaded / ev.total);
-                                    }
-                                },
-                                false
-                            );
-                            return xhr;
-                        },
-                        complete: function () {
-                            setProgressCaption("Upload complete.");
-                            setProgressPercentage(1);
-                        },
-                        success: function (data) {
-                            onUploaded(data);
-                            ourClose();
-                        },
-                        error: function () {
-                            setProgressCaption("Upload failed.");
-                        }
-                    });
-
-                }
-
-            });
-
-        });
-
-    }
-
-    //
-    return {
-        'supportsDrop': supportsDrop,
-        'init': initArea
-    };
-
-})(
-    jQuery,
-    (function () {
-        "use strict";
 
+	var getCurrentScriptPath = function () {
         // Determine current script path
         // @ref https://stackoverflow.com/a/26023176
         var scripts = document.querySelectorAll('script[src]');
@@ -217,5 +32,417 @@ var contented = (function ($, currentScriptPath) {
         var currentScriptFile = currentScriptChunks[currentScriptChunks.length - 1];
 
         return currentScript.replace(currentScriptFile, '');
-    })()
+    };
-);
+	
+	var currentScriptPath = getCurrentScriptPath();
+	var baseURL = currentScriptPath.replace('sdk.js', '');
+	
+	return {
+		"loaded": false,
+		
+		"baseURL": baseURL,
+		
+		"__preInit": [],
+		
+		/**
+		* initArea shows the contented upload widget over the top of a target DOM element.
+		*
+		* @param any        element       Drop target (string selector / DOMElement / jQuery)
+		* @param Function   onUploaded    Called with an array of upload IDs
+		* @param Function   onClose       Called when the widget is being destroyed
+		*/
+		"init": function(elementSelector, onUploaded, onClose) {
+			contented.__preInit.push([elementSelector, onUploaded, onClose]);
+		},
+		
+		/**
+		* supportsDrop returns whether drag-and-drop is supported by this browser.
+		*
+		* @return bool
+		*/
+		"supportsDrop": function() {
+			return ('ondrop' in window && 'FormData' in window && 'FileReader' in window);
+		},
+		
+		"getPreviewURL": function(id) {
+			return baseURL + "get/" + id; // n.b. there's no better preview URL yet
+		},
+		"getDownloadURL": function(id) {
+			return baseURL + "get/" + id;
+		},
+		"getInfoJSONURL": function(id) {
+			return baseURL + "info/" + id;
+		}
+	};
+	
+})();
+
+;(function() {
+	"use strict";
+	
+	var loadScript = function(url, onLoad) {
+		var script = document.createElement('script');
+		script.onload = onLoad;
+		script.src = url;
+		document.head.appendChild(script);
+	};
+	
+	var loadScripts = function(urls, onLoad) {
+		if (urls.length === 0) {
+			onLoad();
+			return;
+		}
+		
+		var totalLoaded = 0;
+		var cb = function() {
+			totalLoaded += 1;
+			if (totalLoaded == urls.length) {
+				onLoad();
+			}
+		};
+		for (var i = 0; i < urls.length; ++i) {
+			loadScript(urls[i], cb);
+		}
+	};
+		
+    var formatBytes = function(bytes) {
+		var k = 1024, m = (1024*1024), g = (1024*1024*1024);
+		
+        if (bytes < k) {
+            return bytes + " B";
+        } else if (bytes < m) {
+            return (bytes / k).toFixed(1) + " KiB";
+        } else if (bytes < g) {
+            return (bytes / m).toFixed(1) + " MiB";
+        } else {
+            return (bytes / g).toFixed(1) + " GiB";
+        }
+    };
+	
+	// @ref https://stackoverflow.com/a/2117523
+	var guid = function uuidv4() {
+		return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
+			var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
+			return v.toString(16);
+		});
+	};
+
+	var afterScriptsLoaded = function() {		
+
+		var initArea = function (elementSelector, onUploaded, onClose) {
+			onUploaded = onUploaded || function () { };
+			onClose = onClose || function () { };
+
+			if ($(elementSelector).length != 1) {
+				return; // should only find one element
+			}
+			var element = $(elementSelector)[0];
+
+			// <input type="hidden" name="MAX_FILE_SIZE" value="` + ret.MaxUploadBytes + `" /> 
+
+			// Create a new div for ourselves on top of the existing area
+			$.get(contented.baseURL + "about", function (ret) {
+				
+				var extraText = "";
+				if (ret.MaxUploadBytes > 0) {
+					extraText = " (max " + formatBytes(ret.MaxUploadBytes) + ")";
+				}
+
+				$.get(contented.baseURL + "widget.html", function (widgetHtml) {
+
+					var $f = $("<div>").html(widgetHtml);
+					$f.find(".contented-extratext").text(extraText);
+
+					// Tab buttons
+					
+					var hasSetupDrawingBoardYet = false;
+					var setType = function (type) {
+						$f.find(".contented-upload-type").removeClass("contented-upload-type-active");
+						$f.find(".contented-upload-type[data-upload-type=" + type + "]").addClass("contented-upload-type-active");
+
+						$f.find(".contented-upload-if").removeClass("contented-active");
+						$f.find(".contented-if-" + type).addClass("contented-active");
+						
+						if (type == "drag") {
+							enablePasteHandler();
+						} else {
+							disablePasteHandler();
+						}
+						
+						if (type == "drawing" && !hasSetupDrawingBoardYet) {
+							setupDrawingBoard();
+							hasSetupDrawingBoardYet = true;
+						}
+					};
+
+					$f.find(".contented-upload-type").click(function () {
+						setType($(this).attr('data-upload-type'));
+					});
+
+					// Widget positioning
+
+					var $element = $(element);
+					var offset = $element.offset();
+
+					$f.css({
+						'position': 'absolute',
+						'left': offset.left + "px",
+						'top': offset.top + "px",
+						'width': $element.width() + "px",
+						'min-width': $element.width() + "px",
+						'max-width': $element.width() + "px",
+						'height': $element.height() + "px",
+						'min-height': $element.height() + "px",
+						'max-height': $element.height() + "px"
+					});
+
+					// Drag and drop support
+					
+					$f.find('.contented').on('dragover dragenter', function (e) {
+						e.preventDefault();
+						e.stopPropagation();
+						$(this).addClass('is-dragging');
+					});
+
+					$f.find('.contented').on('dragleave dragend', function (e) {
+						e.preventDefault();
+						e.stopPropagation();
+						$(this).removeClass('is-dragging');
+					});
+
+					$f.find('.contented').on('drop', function (e) {
+						e.preventDefault();
+						e.stopPropagation();
+						handleUploadFrom(e.originalEvent.dataTransfer.files);
+					});
+
+					$f.find('.contented-file-upload').on('click', function(e) {
+						e.preventDefault();
+						e.stopPropagation();
+						handleUploadFrom($(".contented-file-selector")[0].files);
+					});
+
+					// Pastebin
+					
+					$f.find('.contented-paste-upload').on('click', function(e) {
+						e.preventDefault();
+						e.stopPropagation();
+						var blob = new Blob([$(".contented-if-paste textarea").val()], {type : 'text/plain'});
+						handleUploadFrom([blob]);
+					});
+
+					// Ctrl+V uploads
+					
+					var pasteHandler = function(e) {
+						e.preventDefault();
+						e.stopPropagation();
+						
+						var items = (e.clipboardData || e.originalEvent.clipboardData).items;
+						var items_length = items.length;
+						var blobs = [];
+						var handled = 0;
+						var haveHandled = function() {
+							handled += 1;
+							if (handled == items_length) {
+								
+								if (blobs.length > 0) {
+									handleUploadFrom( blobs );
+								} else {
+									// alert("Pasted 0 files");
+								}
+							}
+						};
+						
+						for (var i = 0; i < items.length; ++i) {
+							var item = items[i];
+							var mimeType = item.type;
+							if (item.kind === 'file') {
+								blobs.push(item.getAsFile());
+								haveHandled();
+								
+							} else if (item.kind === 'string') {
+								item.getAsString(function(s) {
+									blobs.push( new Blob([s], {type : mimeType}) );
+									haveHandled();
+								});
+								
+							} else {
+								// file|string are the only supported types in
+								// all browsers at the time of writing
+								// Ignore future possibilities
+								haveHandled();
+							}
+						}
+					};
+					var enablePasteHandler = function() {
+						document.addEventListener('paste', pasteHandler);
+					};
+					var disablePasteHandler = function() {
+						document.removeEventListener('paste', pasteHandler);
+					};
+					
+					// Embed in DOM, load default area
+					
+					$("body").append($f);
+					if (!contented.supportsDrop()) {
+						setType('file');
+					} else {
+						setType('drag');
+					}
+					
+					// Drawing board
+					
+					var setupDrawingBoard = function() {
+						
+						var db_id = "contented-drawing-area-" + guid();
+						var $db = $("<div>").attr('id', db_id);
+						
+						DrawingBoard.Control.ContentedUpload = DrawingBoard.Control.extend({
+							name: 'upload',
+
+							initialize: function() {
+								var $el = this.$el;
+								
+								$el.append('<button class="contented-drawingboard-upload">Upload</button>');
+								$el.on('click', '.contented-drawingboard-upload', $.proxy(function(e) {
+									e.preventDefault();
+									e.stopPropagation();
+									
+									$el.prop('disabled', true);
+									$el.text('Saving...');
+									
+									$db.find("canvas")[0].toBlob(function(theBlob) {
+										handleUploadFrom([ theBlob ]);
+									});
+								}, this));
+							}
+						});
+						
+						$db.css({
+							//'width': $f.find(".contented-content-area").width(),
+							'height': $f.find(".contented-content-area").height(),
+							'overflow': 'hidden'
+						});
+						
+						$f.find(".contented-drawing-area").append($db);
+						var db = new DrawingBoard.Board(db_id, {
+							'controls': [
+								'Color',
+								'Size',
+								'DrawingMode',
+								'Navigation',
+								'ContentedUpload'
+							],
+							'controlsPosition': 'center',
+							'enlargeYourContainer': false,
+							'webStorage': false,
+							'droppable': false // don't mess with existing drop support
+						});
+						
+					};
+
+					// Close button
+					
+					var ourClose = function () {
+						$f.remove(); // remove from dom
+						disablePasteHandler();
+						onClose(); // upstream close
+					};
+					$f.find(".contented-close").click(function () {
+						ourClose();
+					})
+
+					// Progress bar
+					
+					var setProgressCaption = function(message) {
+						$f.find(".contented-if-progress label").text(message);
+					};
+					var setProgressPercentage = function(frc) {
+						$f.find(".contented-progress-element").css('width', (frc * 100) + "%");
+					};
+
+					// Common upload handler
+					
+					var handleUploadFrom = function(files) {
+
+						setProgressCaption("Uploading, please wait...");
+						setProgressPercentage(0);
+						setType("progress");
+
+						$f.find(".contented-upload-type-selector").hide();
+						$f.find(".contented").removeClass('is-dragging');
+
+						// Ajax uploader
+						var ajaxData = new FormData();
+						for (var i = 0; i < files.length; ++i) {
+							ajaxData.append("f", files[i]);
+						}
+
+						// ajax request
+						$.ajax({
+							url: contented.baseURL + "upload",
+							type: "POST",
+							data: ajaxData,
+							dataType: 'json', // response type
+							cache: false,
+							contentType: false,
+							processData: false,
+							xhr: function() {
+								var xhr = $.ajaxSettings.xhr();
+								xhr.upload.addEventListener(
+									'progress',
+									function(ev) {
+										if (ev.lengthComputable) {
+											setProgressCaption("Uploading (" + formatBytes(ev.loaded) + " / " + formatBytes(ev.total) + ")...");
+											setProgressPercentage(ev.total == 0 ? 0 : ev.loaded / ev.total);
+										}
+									},
+									false
+								);
+								return xhr;
+							},
+							complete: function () {
+								setProgressPercentage(1);
+							},
+							success: function (data) {
+								setProgressCaption("Upload completed successfully.");
+								onUploaded(data);
+								ourClose();
+							},
+							error: function () {
+								setProgressCaption("Upload failed!");
+							}
+						});
+
+					}
+					
+					// .
+
+				});
+
+			});
+
+		}
+		
+		// Update fields in global variable
+		contented.init = initArea;
+		contented.loaded = true;
+		
+		// Call initArea for all pre-initialised elements
+		for (var i = 0; i < contented.__preInit.length; ++i) {
+			initArea(contented.__preInit[i][0], contented.__preInit[i][1], contented.__preInit[i][2]);
+		}
+	};
+		
+	// Load scripts
+	var needScripts = [];
+	if (typeof jQuery === "undefined") {
+		needScripts.push("jquery-1.12.4.min.js");
+	}
+	if (typeof DrawingBoard === "undefined") {
+		needScripts.push("drawingboard-0.4.6.min.js");
+	}
+	
+	loadScripts(needScripts, afterScriptsLoaded);
+	
+})()

static/widget.html

@@ -24,6 +24,7 @@
 .contented .contented-upload-type-selector {
     display:block;
     margin-bottom: 1em;
+    -webkit-user-select: none;
     user-select: none; 
 }
 .contented .contented-upload-type {
@@ -66,7 +67,7 @@
 .contented-upload-if {
     display:none;
 }
-.contented-if-paste {
+.contented-if-paste, .contented-if-drawing {
     height:100%;
 }
 .contented-upload-if.contented-active {
@@ -122,11 +123,17 @@
                 <path fill="#000000" d="M19,20H5V4H7V7H17V4H19M12,2A1,1 0 0,1 13,3A1,1 0 0,1 12,4A1,1 0 0,1 11,3A1,1 0 0,1 12,2M19,2H14.82C14.4,0.84 13.3,0 12,0C10.7,0 9.6,0.84 9.18,2H5A2,2 0 0,0 3,4V20A2,2 0 0,0 5,22H19A2,2 0 0,0 21,20V4A2,2 0 0,0 19,2Z" />
             </svg>
         </div>
+        
+        <div class="contented-upload-type" data-upload-type="drawing" title="Drawing">
+			<svg viewBox="0 0 24 24">
+				<path fill="#000000" d="M16.84,2.73C16.45,2.73 16.07,2.88 15.77,3.17L13.65,5.29L18.95,10.6L21.07,8.5C21.67,7.89 21.67,6.94 21.07,6.36L17.9,3.17C17.6,2.88 17.22,2.73 16.84,2.73M12.94,6L4.84,14.11L7.4,14.39L7.58,16.68L9.86,16.85L10.15,19.41L18.25,11.3M4.25,15.04L2.5,21.73L9.2,19.94L8.96,17.78L6.65,17.61L6.47,15.29" />
+			</svg>
+		</div>
     </div>
     
     <div class="contented-content-area">
         <div class="contented-upload-if contented-if-drag contented-active">
-            <label>Drop files to upload <span class="contented-extratext"></span></label>
+            <label>Drop files or Ctrl-V to upload <span class="contented-extratext"></span></label>
         </div>
 
         <div class="contented-upload-if contented-if-file">
@@ -140,9 +147,14 @@
             <button class="contented-paste-upload">Upload &raquo;</button>
         </div>
 
+        <div class="contented-upload-if contented-if-drawing">
+			<link rel="stylesheet" type="text/css" href="/drawingboard-0.4.6.min.css">
+			<div class="contented-drawing-area"></div>
+        </div>
+        
         <div class="contented-upload-if contented-if-progress">
             <label>...</label>
             <div class="contented-progress-bar"><div class="contented-progress-element"></div></div>
         </div>
     </div>
-</div>
+</div>

upload.go

@@ -18,15 +18,17 @@ import (
 
 func (this *Server) handleUpload(w http.ResponseWriter, r *http.Request) {
 
+	remoteIP := this.remoteIP(r)
+
 	err := r.ParseMultipartForm(this.opts.MaxUploadBytes * 2)
 	if err != nil {
-		log.Printf("%s Invalid request: %s\n", r.RemoteAddr, err.Error())
+		log.Printf("%s Invalid request: %s\n", remoteIP, err.Error())
 		http.Error(w, "Invalid request", 400)
 		return
 	}
 
 	if r.MultipartForm == nil || r.MultipartForm.File == nil || len(r.MultipartForm.File["f"]) < 1 {
-		log.Printf("%s Invalid request: no multipart content\n", r.RemoteAddr)
+		log.Printf("%s Invalid request: no multipart content\n", remoteIP)
 		http.Error(w, "Invalid request", 400)
 		return
 	}
@@ -36,14 +38,14 @@ func (this *Server) handleUpload(w http.ResponseWriter, r *http.Request) {
 	for _, fhs := range r.MultipartForm.File["f"] {
 		f, err := fhs.Open()
 		if err != nil {
-			log.Printf("%s Internal error: %s\n", r.RemoteAddr, err.Error())
+			log.Printf("%s Internal error: %s\n", remoteIP, err.Error())
 			http.Error(w, "Internal error", 500)
 			return
 		}
 
-		path, err := this.handleUploadFile(f, fhs, remoteIP(r))
+		path, err := this.handleUploadFile(f, fhs, remoteIP)
 		if err != nil {
-			log.Printf("%s Upload failed: %s\n", r.RemoteAddr, err.Error())
+			log.Printf("%s Upload failed: %s\n", remoteIP, err.Error())
 			http.Error(w, "Upload failed", 500)
 		}
 
@@ -52,7 +54,7 @@ func (this *Server) handleUpload(w http.ResponseWriter, r *http.Request) {
 
 	jb, err := json.Marshal(ret)
 	if err != nil {
-		log.Printf("%s Internal error: %s\n", r.RemoteAddr, err.Error())
+		log.Printf("%s Internal error: %s\n", remoteIP, err.Error())
 		http.Error(w, "Internal error", 500)
 		return
 	}