From b4346e66b2f179e2f2ee5eb8db529475f7ec992e Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Tue, 24 Nov 2015 00:10:56 +0100
Subject: [PATCH] Added experimental mention support

Still buggy and anything but finished, more like a proof of concept than
a working implementation. Naming is still inconsistent and is something
I'm working on.
---
 .../templates/htmlNodeWoltlabMention.tpl      |   7 +
 com.woltlab.wcf/templates/wysiwyg.tpl         |  15 +
 .../redactor2/plugins/WoltLabEvent.js         |  38 ++
 .../redactor2/plugins/WoltLabMention.js       |  13 +
 wcfsetup/install/files/js/WCF.Assets.js       |   3 +
 .../js/WoltLab/WCF/Ui/Redactor/Mention.js     | 345 ++++++++++++++++++
 .../html/input/HtmlInputProcessor.class.php   |  32 +-
 .../filter/MessageHtmlInputFilter.class.php   |   6 +
 .../node/HtmlInputNodeProcessor.class.php     |  18 +
 .../HtmlInputNodeWoltlabMention.class.php     |  31 ++
 .../html/input/node/IHtmlInputNode.class.php  |   6 +
 .../html/node/HtmlNodeProcessor.class.php     |  57 +++
 .../output/HtmlOutputNodeProcessor.class.php  |  53 +--
 .../html/output/HtmlOutputProcessor.class.php |   6 +-
 ...php => HtmlOutputNodeBlockquote.class.php} |   6 +-
 .../HtmlOutputNodeWoltlabMention.class.php    |  74 ++++
 .../system/session/SessionHandler.class.php   |   4 +-
 17 files changed, 664 insertions(+), 50 deletions(-)
 create mode 100644 com.woltlab.wcf/templates/htmlNodeWoltlabMention.tpl
 create mode 100644 wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabMention.js
 create mode 100644 wcfsetup/install/files/js/WoltLab/WCF/Ui/Redactor/Mention.js
 create mode 100644 wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
 create mode 100644 wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMention.class.php
 create mode 100644 wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php
 create mode 100644 wcfsetup/install/files/lib/system/html/node/HtmlNodeProcessor.class.php
 rename wcfsetup/install/files/lib/system/html/output/node/{QuoteHtmlOutputNode.class.php => HtmlOutputNodeBlockquote.class.php} (96%)
 create mode 100644 wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMention.class.php

diff --git a/com.woltlab.wcf/templates/htmlNodeWoltlabMention.tpl b/com.woltlab.wcf/templates/htmlNodeWoltlabMention.tpl
new file mode 100644
index 0000000000..ac2b3d7e47
--- /dev/null
+++ b/com.woltlab.wcf/templates/htmlNodeWoltlabMention.tpl
@@ -0,0 +1,7 @@
+{if $userProfile === null}
+	{* user no longer exists, use plain output rather than using a broken link *}
+	@{$username}
+{else}
+	{* non-breaking space below to prevent wrapping of user avatar and username *}
+	<a href="{link controller='User' object=$userProfile->getDecoratedObject()}{/link}">{@$userProfile->getAvatar()->getImageTag(16)}&nbsp;{$userProfile->username}</a>
+{/if}
\ No newline at end of file
diff --git a/com.woltlab.wcf/templates/wysiwyg.tpl b/com.woltlab.wcf/templates/wysiwyg.tpl
index 475c223556..272816bb3c 100644
--- a/com.woltlab.wcf/templates/wysiwyg.tpl
+++ b/com.woltlab.wcf/templates/wysiwyg.tpl
@@ -1,3 +1,12 @@
+<style>
+	woltlab-mention {
+		background-color: rgb(240, 248, 255);
+		border: 1px solid rgb(52, 152, 219);
+		display: inline-block;
+		margin: 0 3px;
+		padding: 0 2px;
+	}
+</style>
 <script data-relocate="true">
 (function() {
 	var buttons = ['format', 'wcfSeparator', 'bold', 'italic', 'underline', 'deleted', 'wcfSeparator', 'lists', 'image', 'link'];
@@ -20,6 +29,11 @@
 			}
 		};
 		
+		// user mentions
+		if (elDataBool(element, 'support-mention')) {
+			config.plugins.push('WoltLabMention');
+		}
+		
 		$(element).redactor(config);
 	});
 		
@@ -30,6 +44,7 @@
 		'{@$__wcf->getPath()}js/3rdParty/redactor2/plugins/WoltLabButton.js?v={@LAST_UPDATE_TIME}',
 		'{@$__wcf->getPath()}js/3rdParty/redactor2/plugins/WoltLabDropdown.js?v={@LAST_UPDATE_TIME}', 
 		'{@$__wcf->getPath()}js/3rdParty/redactor2/plugins/WoltLabEvent.js?v={@LAST_UPDATE_TIME}',
+		'{@$__wcf->getPath()}js/3rdParty/redactor2/plugins/WoltLabMention.js?v={@LAST_UPDATE_TIME}',
 		'{@$__wcf->getPath()}js/3rdParty/redactor2/plugins/WoltLabQuote.js?v={@LAST_UPDATE_TIME}'
 		
 		], function() {
diff --git a/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabEvent.js b/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabEvent.js
index 2dcedae7dd..21d6e8a03d 100644
--- a/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabEvent.js
+++ b/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabEvent.js
@@ -3,6 +3,9 @@ $.Redactor.prototype.WoltLabEvent = function() {
 	
 	return {
 		init: function() {
+			this._callbacks = [];
+			this._elementId = this.$element[0].id;
+			
 			require(['EventHandler'], this.WoltLabEvent._setEvents.bind(this));
 		},
 		
@@ -17,6 +20,41 @@ $.Redactor.prototype.WoltLabEvent = function() {
 					editor: this.$editor[0]
 				});
 			}).bind(this);
+			
+			this.opts.callbacks.keyup = function(event) {
+				var data = {
+					cancel: false,
+					event: event
+				};
+				
+				EventHandler.fire('com.woltlab.wcf.redactor', 'keyup_' + elementId, data);
+				
+				return (data.cancel === false);
+			};
+		},
+		
+		register: function(callbackName, callback) {
+			require(['EventHandler'], (function(EventHandler) {
+				if (this._callbacks.indexOf(callbackName) === -1) {
+					this.opts.callbacks[callbackName] = (function (event) {
+						var data = {
+							cancel: false,
+							event: event,
+							redactor: this
+						};
+						
+						EventHandler.fire('com.woltlab.wcf.redactor2', callbackName + '_' + this.WoltLabEvent._elementId, data);
+						
+						return (data.cancel === false);
+					}).bind(this);
+					
+					this._callbacks.push(callbackName);
+				}
+				
+				require(['EventHandler'], (function(EventHandler) {
+					EventHandler.add('com.woltlab.wcf.redactor2', callbackName + '_' + this.WoltLabEvent._elementId, callback);
+				}).bind(this));
+			}).bind(this));
 		}
 	};
 };
diff --git a/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabMention.js b/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabMention.js
new file mode 100644
index 0000000000..94265c1834
--- /dev/null
+++ b/wcfsetup/install/files/js/3rdParty/redactor2/plugins/WoltLabMention.js
@@ -0,0 +1,13 @@
+$.Redactor.prototype.WoltLabMention = function() {
+	"use strict";
+	
+	return {
+		init: function() {
+			var WoltLabMention = document.registerElement('woltlab-mention');
+			
+			require(['WoltLab/WCF/Ui/Redactor/Mention'], (function(UiRedactorMention) {
+				new UiRedactorMention(this);
+			}).bind(this));
+		}
+	};
+};
diff --git a/wcfsetup/install/files/js/WCF.Assets.js b/wcfsetup/install/files/js/WCF.Assets.js
index 6e69b0b564..f4baf65a9b 100644
--- a/wcfsetup/install/files/js/WCF.Assets.js
+++ b/wcfsetup/install/files/js/WCF.Assets.js
@@ -42,3 +42,6 @@
  * http://flaviusmatis.github.com/license.html
  */
 (function(e){var t={init:function(){var t=["paddingTop","paddingRight","paddingBottom","paddingLeft","fontSize","lineHeight","fontFamily","width","fontWeight","border-top-width","border-right-width","border-bottom-width","border-left-width","-moz-box-sizing","-webkit-box-sizing","box-sizing"];return this.each(function(){function i(){for(var e=0;e<t.length;e++){r.css(t[e],n.css(t[e]))}}function c(){var e=n.val().replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/&/g,"&").replace(/\n/g,"<br/>");r.html(e+"&nbsp;");h()}function h(){var e=r.height();var t="hidden";var i=s?e+a+o:e+a;if(i>l){i=l;t="auto"}else if(i<f){i=f}if(n.height()!==i){n.css({overflow:t,height:i+"px"})}}if(this.type!=="textarea")return false;var n=e(this).css({resize:"none",overflow:"hidden"});var r=e("<div></div>").css({position:"absolute",display:"none","word-wrap":"break-word","white-space":"pre-wrap","border-style":"solid"}).appendTo(document.body);i();var s=n.css("box-sizing")=="border-box"||n.css("-moz-box-sizing")=="border-box"||n.css("-webkit-box-sizing")=="border-box";var o=parseInt(n.css("border-top-width"))+parseInt(n.css("padding-top"))+parseInt(n.css("padding-bottom"))+parseInt(n.css("border-bottom-width"));var u=parseInt(n.css("height"),10);var a=parseInt(n.css("line-height"),10)||parseInt(n.css("font-size"),10);var f=a*2>u?a*2:u;var l=parseInt(n.css("max-height"),10)>-1?parseInt(n.css("max-height"),10):Number.MAX_VALUE;n.bind("keyup change cut paste",function(){c()});e(window).bind("resize",function(){var e=parseInt(n.width(),10);if(r.width()!==e){r.css({width:e+"px"});c()}});n.bind("blur",function(){h()});n.bind("updateHeight",function(){i();c()});e(function(){c()})})}};e.fn.flexible=function(n){if(t[n]){return t[n].apply(this,Array.prototype.slice.call(arguments,1))}else if(typeof n==="object"||!n){return t.init.apply(this,arguments)}else{e.error("Method "+n+" does not exist on jQuery.flexible")}}})(jQuery);
+
+/*! (C) WebReflection Mit Style License */
+(function(e,t,n,r){"use strict";function rt(e,t){for(var n=0,r=e.length;n<r;n++)dt(e[n],t)}function it(e){for(var t=0,n=e.length,r;t<n;t++)r=e[t],nt(r,b[ot(r)])}function st(e){return function(t){j(t)&&(dt(t,e),rt(t.querySelectorAll(w),e))}}function ot(e){var t=e.getAttribute("is"),n=e.nodeName.toUpperCase(),r=S.call(y,t?v+t.toUpperCase():d+n);return t&&-1<r&&!ut(n,t)?-1:r}function ut(e,t){return-1<w.indexOf(e+'[is="'+t+'"]')}function at(e){var t=e.currentTarget,n=e.attrChange,r=e.attrName,i=e.target;Q&&(!i||i===t)&&t.attributeChangedCallback&&r!=="style"&&t.attributeChangedCallback(r,n===e[a]?null:e.prevValue,n===e[l]?null:e.newValue)}function ft(e){var t=st(e);return function(e){X.push(t,e.target)}}function lt(e){K&&(K=!1,e.currentTarget.removeEventListener(h,lt)),rt((e.target||t).querySelectorAll(w),e.detail===o?o:s),B&&pt()}function ct(e,t){var n=this;q.call(n,e,t),G.call(n,{target:n})}function 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\ No newline at end of file
diff --git a/wcfsetup/install/files/js/WoltLab/WCF/Ui/Redactor/Mention.js b/wcfsetup/install/files/js/WoltLab/WCF/Ui/Redactor/Mention.js
new file mode 100644
index 0000000000..e8e8c553f4
--- /dev/null
+++ b/wcfsetup/install/files/js/WoltLab/WCF/Ui/Redactor/Mention.js
@@ -0,0 +1,345 @@
+define(['Ajax', 'Environment', 'EventHandler', 'Ui/Alignment'], function(Ajax, Environment, EventHandler, UiAlignment) {
+	"use strict";
+	
+	function UiRedactorMention(redactor) { this.init(redactor); }
+	UiRedactorMention.prototype = {
+		init: function(redactor) {
+			this._active = false;
+			this._caret = null;
+			this._dropdownActive = false;
+			this._dropdownMenu = null;
+			this._itemIndex = 0;
+			this._lineHeight = null;
+			this._mentionStart = '';
+			this._redactor = redactor;
+			this._timer = null;
+			
+			redactor.WoltLabEvent.register('keydown', this._keyDown.bind(this));
+			redactor.WoltLabEvent.register('keyup', this._keyUp.bind(this));
+		},
+		
+		_keyDown: function(data) {
+			if (!this._dropdownActive) {
+				return;
+			}
+			
+			/** @var Event event */
+			var event = data.event;
+			
+			switch (event.which) {
+				// enter
+				case 13:
+					this._setUsername(null, this._dropdownMenu.children[this._itemIndex].children[0]);
+					break;
+				
+				// arrow up
+				case 38:
+					this._selectItem(-1);
+					break;
+				
+				// arrow down
+				case 40:
+					this._selectItem(1);
+					break;
+				
+				default:
+					return;
+					break;
+			}
+			
+			event.preventDefault();
+			data.cancel = true;
+		},
+		
+		_keyUp: function(data) {
+			/** @var Event event */
+			var event = data.event;
+			
+			// ignore return key
+			if (event.which === 13) {
+				this._active = false;
+				
+				return;
+			}
+			
+			var text = this._getTextLineInFrontOfCaret();
+			if (text.length) {
+				var match = text.match(/@([^,]{3,})$/);
+				if (match) {
+					// if mentioning is at text begin or there's a whitespace character
+					// before the '@', everything is fine
+					if (!match.index || text[match.index - 1].match(/\s/)) {
+						this._mentionStart = match[1];
+						
+						if (this._timer !== null) {
+							window.clearTimeout(this._timer);
+							this._timer = null;
+						}
+						
+						this._timer = window.setTimeout((function() {
+							Ajax.api(this, {
+								parameters: {
+									data: {
+										searchString: this._mentionStart
+									}
+								}
+							});
+							
+							this._timer = null;
+						}).bind(this), 500);
+					}
+				}
+				else {
+					this._hideDropdown();
+				}
+			}
+			else {
+				this._hideDropdown();
+			}
+		},
+		
+		_setUsername: function(event, item) {
+			if (event) {
+				event.preventDefault();
+				item = event.currentTarget;
+			}
+			
+			/*if (this._timer !== null) {
+				this._timer.stop();
+				this._timer = null;
+			}
+			this._proxy.abortPrevious();*/
+			
+			var selection = window.getSelection();
+			
+			// restore caret position
+			selection.removeAllRanges();
+			selection.addRange(this._caret);
+			
+			var orgRange = selection.getRangeAt(0).cloneRange();
+			
+			// allow redactor to undo this
+			this._redactor.buffer.set();
+			
+			var startContainer = orgRange.startContainer;
+			var startOffset = orgRange.startOffset - (this._mentionStart.length + 1);
+			
+			// navigating with the keyboard before hitting enter will cause the text node to be split
+			if (startOffset < 0) {
+				startContainer = startContainer.previousSibling;
+				startOffset = startContainer.length - (this._mentionStart.length + 1) - (orgRange.startOffset - 1);
+			}
+			
+			var newRange = document.createRange();
+			newRange.setStart(startContainer, startOffset);
+			newRange.setEnd(orgRange.startContainer, orgRange.startOffset);
+			
+			selection.removeAllRanges();
+			selection.addRange(newRange);
+			
+			var range = getSelection().getRangeAt(0);
+			range.deleteContents();
+			range.collapse(true);
+			
+			var mention = elCreate('woltlab-mention');
+			elAttr(mention, 'contenteditable', 'false');
+			elData(mention, 'user-id', elData(item, 'user-id'));
+			elData(mention, 'username', elData(item, 'username'));
+			mention.textContent = elData(item, 'username');
+			
+			// U+200C = zero width non-joiner
+			var text = document.createTextNode('\u200c');
+			
+			range.insertNode(text);
+			range.insertNode(mention);
+			
+			newRange = document.createRange();
+			newRange.selectNode(text);
+			newRange.collapse(false);
+			
+			selection.removeAllRanges();
+			selection.addRange(newRange);
+			
+			this._redactor.selection.save();
+			
+			this._hideDropdown();
+		},
+		
+		_getTextLineInFrontOfCaret: function() {
+			/** @var Range range */
+			var range = window.getSelection().getRangeAt(0);
+			if (!range.collapsed) {
+				return '';
+			}
+			
+			// in Firefox, blurring and refocusing the browser creates separate text nodes
+			if (Environment.browser() === 'firefox' && range.startContainer.nodeType === Node.TEXT_NODE) {
+				range.startContainer.parentNode.normalize();
+			}
+			
+			var text = range.startContainer.textContent.substr(0, range.startOffset);
+			
+			// remove unicode zero-width space and non-breaking space
+			var textBackup = text;
+			text = '';
+			var hadSpace = false;
+			for (var i = 0; i < textBackup.length; i++) {
+				var byte = textBackup.charCodeAt(i).toString(16);
+				if (byte !== '200b' && (!/\s/.test(textBackup[i]) || ((byte === 'a0' || byte === '20') && !hadSpace))) {
+					if (byte === 'a0' || byte === '20') {
+						hadSpace = true;
+					}
+					
+					if (textBackup[i] === '@' && i && /\s/.test(textBackup[i - 1])) {
+						hadSpace = false;
+						text = '';
+					}
+					
+					text += textBackup[i];
+				}
+				else {
+					hadSpace = false;
+					text = '';
+				}
+			}
+			
+			return text;
+		},
+		
+		_ajaxSetup: function() {
+			return {
+				data: {
+					actionName: 'getSearchResultList',
+					className: 'wcf\\data\\user\\UserAction',
+					interfaceName: 'wcf\\data\\ISearchAction',
+					parameters: {
+						data: {
+							includeUserGroups: false
+						}
+					}
+				}
+			};
+		},
+		
+		_ajaxSuccess: function(data) {
+			if (!Array.isArray(data.returnValues) || !data.returnValues.length) {
+				this._hideDropdown();
+				
+				return;
+			}
+			
+			if (this._dropdownMenu === null) {
+				this._dropdownMenu = elCreate('ol');
+				this._dropdownMenu.className = 'dropdownMenu';
+				elById('dropdownMenuContainer').appendChild(this._dropdownMenu);
+			}
+			
+			this._dropdownMenu.innerHTML = '';
+			
+			var callbackClick = this._setUsername.bind(this), link, listItem, user;
+			for (var i = 0, length = data.returnValues.length; i < length; i++) {
+				user = data.returnValues[i];
+				
+				listItem = elCreate('li');
+				link = elCreate('a');
+				link.addEventListener('click', callbackClick);
+				link.className = 'box16';
+				link.innerHTML = '<span class="framed">' + user.icon + '</span> <span>' + user.label + '</span>';
+				elData(link, 'user-id', user.objectID);
+				elData(link, 'username', user.label);
+				
+				listItem.appendChild(link);
+				this._dropdownMenu.appendChild(listItem);
+			}
+			
+			this._dropdownMenu.classList.add('dropdownOpen');
+			this._dropdownActive = true;
+			
+			this._updateDropdownPosition();
+		},
+		
+		_getDropdownMenuPosition: function() {
+			this._redactor.selection.save();
+			
+			var selection = window.getSelection();
+			var orgRange = selection.getRangeAt(0).cloneRange();
+			
+			// mark the entire text, starting from the '@' to the current cursor position
+			var newRange = document.createRange();
+			newRange.setStart(orgRange.startContainer, orgRange.startOffset - (this._mentionStart.length + 1));
+			newRange.setEnd(orgRange.startContainer, orgRange.startOffset);
+			
+			selection.removeAllRanges();
+			selection.addRange(newRange);
+			
+			// get the offsets of the bounding box of current text selection
+			var rect = selection.getRangeAt(0).getBoundingClientRect();
+			var offsets = {
+				top: Math.round(rect.bottom) + document.body.scrollTop,
+				left: Math.round(rect.left) + document.body.scrollLeft
+			};
+			
+			if (this._lineHeight === null) {
+				this._lineHeight = Math.round(rect.bottom - rect.top - document.body.scrollTop);
+			}
+			
+			// restore caret position
+			this._redactor.selection.restore();
+			
+			this._caret = orgRange;
+			
+			return offsets;
+		},
+		
+		_updateDropdownPosition: function() {
+			try {
+				var offset = this._getDropdownMenuPosition();
+				offset.top += 7; // add a little vertical gap
+				
+				this._dropdownMenu.style.setProperty('left', offset.left + 'px', '');
+				this._dropdownMenu.style.setProperty('top', offset.top + 'px', '');
+				
+				this._selectItem(0);
+				
+				if (offset.top + this._dropdownMenu.offsetHeight + 10 > window.innerHeight + document.body.scrollTop) {
+					this._dropdownMenu.classList.add('dropdownArrowBottom');
+					
+					this._dropdownMenu.style.setProperty('top', offset.top - this._dropdownMenu.offsetHeight - 2 * this._lineHeight + 7 + 'px', '');
+				}
+				else {
+					this._dropdownMenu.classList.remove('dropdownArrowBottom');
+				}
+			}
+			catch (e) {
+				console.debug(e);
+				// ignore errors that are caused by pressing enter to
+				// often in a short period of time
+			}
+		},
+		
+		_selectItem: function(step) {
+			// find currently active item
+			var item = elBySel('.active', this._dropdownMenu);
+			if (item !== null) {
+				item.classList.remove('active');
+			}
+			
+			this._itemIndex += step;
+			if (this._itemIndex === -1) {
+				this._itemIndex = this._dropdownMenu.childElementCount - 1;
+			}
+			else if (this._itemIndex === this._dropdownMenu.childElementCount) {
+				this._itemIndex = 0;
+			}
+			
+			this._dropdownMenu.children[this._itemIndex].classList.add('active');
+		},
+		
+		_hideDropdown: function() {
+			if (this._dropdownMenu !== null) this._dropdownMenu.classList.remove('dropdownOpen');
+			this._dropdownActive = false;
+		}
+	};
+	
+	return UiRedactorMention;
+});
diff --git a/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php b/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php
index c930a17e2f..c7a96389e4 100644
--- a/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/HtmlInputProcessor.class.php
@@ -3,6 +3,7 @@ namespace wcf\system\html\input;
 
 use wcf\system\html\input\filter\IHtmlInputFilter;
 use wcf\system\html\input\filter\MessageHtmlInputFilter;
+use wcf\system\html\input\node\HtmlInputNodeProcessor;
 use wcf\system\WCF;
 
 class HtmlInputProcessor {
@@ -11,10 +12,20 @@ class HtmlInputProcessor {
 	 */
 	protected $htmlInputFilter;
 	
+	/**
+	 * @var HtmlInputNodeProcessor
+	 */
+	protected $htmlInputNodeProcessor;
+	
 	public function process($html) {
 		// filter HTML
-		return $this->getHtmlInputFilter()->apply($html);
+		$html = $this->getHtmlInputFilter()->apply($html);
 		
+		// pre-parse HTML
+		$this->getHtmlInputNodeProcessor()->load($html);
+		$this->getHtmlInputNodeProcessor()->process();
+		
+		return $this->getHtmlInputNodeProcessor()->getHtml();
 	}
 	
 	public function setHtmlInputFilter(IHtmlInputFilter $htmlInputFilter) {
@@ -22,7 +33,8 @@ class HtmlInputProcessor {
 	}
 	
 	/**
-	 * @return IHtmlInputFilter
+	 * @return IHtmlInputFilter|MessageHtmlInputFilter
+	 * @throws \DI\NotFoundException
 	 */
 	public function getHtmlInputFilter() {
 		if ($this->htmlInputFilter === null) {
@@ -31,4 +43,20 @@ class HtmlInputProcessor {
 		
 		return $this->htmlInputFilter;
 	}
+	
+	public function setHtmlInputNodeProcessor(HtmlInputNodeProcessor $htmlInputNodeProcessor) {
+		$this->htmlInputNodeProcessor = $htmlInputNodeProcessor;
+	}
+	
+	/**
+	 * @return HtmlInputNodeProcessor
+	 * @throws \DI\NotFoundException
+	 */
+	public function getHtmlInputNodeProcessor() {
+		if ($this->htmlInputNodeProcessor === null) {
+			$this->htmlInputNodeProcessor = WCF::getDIContainer()->make(HtmlInputNodeProcessor::class);
+		}
+		
+		return $this->htmlInputNodeProcessor;
+	}
 }
diff --git a/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php b/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php
index 546200151b..4ec647b2ba 100644
--- a/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/filter/MessageHtmlInputFilter.class.php
@@ -25,8 +25,14 @@ class MessageHtmlInputFilter implements IHtmlInputFilter {
 	}
 	
 	protected function setAttributeDefinitions(\HTMLPurifier_Config $config) {
+		// TODO: move this into own PHP classes
 		$definition = $config->getHTMLDefinition(true);
 		$definition->addAttribute('blockquote', 'data-quote-title', 'Text');
 		$definition->addAttribute('blockquote', 'data-quote-url', 'URI');
+		
+		$definition->addElement('woltlab-mention', 'Inline', 'Inline', '', [
+			'data-user-id' => 'Number',
+			'data-username' => 'Text'
+		]);
 	}
 }
\ No newline at end of file
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
new file mode 100644
index 0000000000..b2540e3a8a
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeProcessor.class.php
@@ -0,0 +1,18 @@
+<?php
+namespace wcf\system\html\input\node;
+
+use wcf\system\html\node\HtmlNodeProcessor;
+use wcf\system\WCF;
+
+class HtmlInputNodeProcessor extends HtmlNodeProcessor {
+	public function load($html) {
+		parent::load($html);
+		
+		$this->nodeData = [];
+	}
+	
+	public function process() {
+		$woltlabMention = WCF::getDIContainer()->get(HtmlInputNodeWoltlabMention::class);
+		$woltlabMention->process($this);
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMention.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMention.class.php
new file mode 100644
index 0000000000..067491c227
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMention.class.php
@@ -0,0 +1,31 @@
+<?php
+namespace wcf\system\html\input\node;
+
+use wcf\system\message\embedded\object\MessageEmbeddedObjectManager;
+
+class HtmlInputNodeWoltlabMention implements IHtmlInputNode {
+	/**
+	 * @var MessageEmbeddedObjectManager
+	 */
+	protected $messageEmbeddedObjectManager;
+	
+	public function __construct(MessageEmbeddedObjectManager $messageEmbeddedObjectManager) {
+		$this->messageEmbeddedObjectManager = $messageEmbeddedObjectManager;
+	}
+	
+	public function process(HtmlInputNodeProcessor $htmlInputNodeProcessor) {
+		$userIds = [];
+		
+		/** @var \DOMElement $mention */
+		foreach ($htmlInputNodeProcessor->getDocument()->getElementsByTagName('woltlab-mention') as $mention) {
+			$userId = intval($mention->getAttribute('data-user-id'));
+			if ($userId) {
+				$userIds[] = $userId;
+			}
+		}
+		
+		if (!empty($userIds)) {
+			
+		}
+	}
+}
diff --git a/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php b/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php
new file mode 100644
index 0000000000..ce78ab91ea
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/html/input/node/IHtmlInputNode.class.php
@@ -0,0 +1,6 @@
+<?php
+namespace wcf\system\html\input\node;
+
+interface IHtmlInputNode {
+	public function process(HtmlInputNodeProcessor $htmlInputNodeProcessor);
+}
diff --git a/wcfsetup/install/files/lib/system/html/node/HtmlNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/node/HtmlNodeProcessor.class.php
new file mode 100644
index 0000000000..a0cfb51a5b
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/html/node/HtmlNodeProcessor.class.php
@@ -0,0 +1,57 @@
+<?php
+namespace wcf\system\html\node;
+
+class HtmlNodeProcessor {
+	/**
+	 * @var \DOMDocument
+	 */
+	protected $document;
+	
+	public function load($html) {
+		$this->document = new \DOMDocument();
+		
+		// convert entities as DOMDocument screws them up
+		$html = mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8');
+		
+		// ignore all errors when loading the HTML string, because DOMDocument does not
+		// provide a proper way to add custom HTML elements (even though explicitly allowed
+		// in HTML5) and the input HTML has already been sanitized by HTMLPurifier
+		@$this->document->loadHTML($html);
+	}
+	
+	public function getHtml() {
+		$html = $this->document->saveHTML();
+		
+		// remove nuisance added by PHP
+		$html = preg_replace('~^<!DOCTYPE[^>]+>\s<html><body>~', '', $html);
+		$html = preg_replace('~</body></html>$~', '', $html);
+		
+		$html = mb_convert_encoding($html, 'UTF-8', 'HTML-ENTITIES');
+		
+		return $html;
+	}
+	
+	public function getDocument() {
+		return $this->document;
+	}
+	
+	public function renameTag(\DOMElement $element, $tagName) {
+		$newElement = $this->document->createElement($tagName);
+		$element->parentNode->insertBefore($newElement, $element);
+		while ($element->hasChildNodes()) {
+			$newElement->appendChild($element->firstChild);
+		}
+		
+		$element->parentNode->removeChild($element);
+		
+		return $newElement;
+	}
+	
+	public function unwrapContent(\DOMElement $element) {
+		while ($element->hasChildNodes()) {
+			$element->parentNode->insertBefore($element->firstChild, $element);
+		}
+		
+		$element->parentNode->removeChild($element);
+	}
+}
\ No newline at end of file
diff --git a/wcfsetup/install/files/lib/system/html/output/HtmlOutputNodeProcessor.class.php b/wcfsetup/install/files/lib/system/html/output/HtmlOutputNodeProcessor.class.php
index 3412314840..97468d3563 100644
--- a/wcfsetup/install/files/lib/system/html/output/HtmlOutputNodeProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/HtmlOutputNodeProcessor.class.php
@@ -1,33 +1,32 @@
 <?php
 namespace wcf\system\html\output;
 
+use wcf\system\html\node\HtmlNodeProcessor;
+use wcf\system\html\output\node\HtmlOutputNodeBlockquote;
+use wcf\system\html\output\node\HtmlOutputNodeWoltlabMention;
 use wcf\system\html\output\node\IHtmlOutputNode;
-use wcf\system\html\output\node\QuoteHtmlOutputNode;
 use wcf\system\WCF;
 
-class HtmlOutputNodeProcessor {
-	/**
-	 * @var \DOMDocument
-	 */
-	protected $document;
-	
+class HtmlOutputNodeProcessor extends HtmlNodeProcessor {
 	protected $nodeData = [];
 	
 	public function load($html) {
-		$this->document = new \DOMDocument();
-		$this->document->loadHTML($html);
+		parent::load($html);
+		
 		$this->nodeData = [];
 	}
 	
 	public function process() {
-		$quoteNode = WCF::getDIContainer()->get(QuoteHtmlOutputNode::class);
+		// TODO: this should be dynamic to some extent
+		$quoteNode = WCF::getDIContainer()->get(HtmlOutputNodeBlockquote::class);
 		$quoteNode->process($this);
 		
-		$html = $this->document->saveHTML();
-		
-		// remove nuisance added by PHP
-		$html = preg_replace('~^<!DOCTYPE[^>]+>\s<html><body>~', '', $html);
-		$html = preg_replace('~</body></html>$~', '', $html);
+		$woltlabMentionNode = WCF::getDIContainer()->get(HtmlOutputNodeWoltlabMention::class);
+		$woltlabMentionNode->process($this);
+	}
+	
+	public function getHtml() {
+		$html = parent::getHtml();
 		
 		/** @var IHtmlOutputNode $obj */
 		foreach ($this->nodeData as $data) {
@@ -44,10 +43,6 @@ class HtmlOutputNodeProcessor {
 		return $html;
 	}
 	
-	public function getDocument() {
-		return $this->document;
-	}
-	
 	public function addNodeData(IHtmlOutputNode $htmlOutputNode, $nodeIdentifier, array $data) {
 		$this->nodeData[] = [
 			'data' => $data,
@@ -55,24 +50,4 @@ class HtmlOutputNodeProcessor {
 			'object' => $htmlOutputNode
 		];
 	}
-	
-	public function renameTag(\DOMElement $element, $tagName) {
-		$newElement = $this->document->createElement($tagName);
-		$element->parentNode->insertBefore($newElement, $element);
-		while ($element->hasChildNodes()) {
-			$newElement->appendChild($element->firstChild);
-		}
-		
-		$element->parentNode->removeChild($element);
-		
-		return $newElement;
-	}
-	
-	public function unwrapContent(\DOMElement $element) {
-		while ($element->hasChildNodes()) {
-			$element->parentNode->insertBefore($element->firstChild, $element);
-		}
-		
-		$element->parentNode->removeChild($element);
-	}
 }
diff --git a/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php b/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php
index b483afabb0..667cfaab96 100644
--- a/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/HtmlOutputProcessor.class.php
@@ -1,8 +1,6 @@
 <?php
 namespace wcf\system\html\output;
 
-use wcf\system\WCF;
-
 class HtmlOutputProcessor {
 	/**
 	 * @var HtmlOutputNodeProcessor
@@ -15,8 +13,8 @@ class HtmlOutputProcessor {
 	
 	public function process($html) {
 		$this->htmlOutputNodeProcessor->load($html);
-		$html = $this->htmlOutputNodeProcessor->process();
+		$this->htmlOutputNodeProcessor->process();
 		
-		return $html;
+		return $this->htmlOutputNodeProcessor->getHtml();
 	}
 }
diff --git a/wcfsetup/install/files/lib/system/html/output/node/QuoteHtmlOutputNode.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeBlockquote.class.php
similarity index 96%
rename from wcfsetup/install/files/lib/system/html/output/node/QuoteHtmlOutputNode.class.php
rename to wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeBlockquote.class.php
index 88efb3d471..eb28108449 100644
--- a/wcfsetup/install/files/lib/system/html/output/node/QuoteHtmlOutputNode.class.php
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeBlockquote.class.php
@@ -7,7 +7,7 @@ use wcf\system\request\RouteHandler;
 use wcf\system\WCF;
 use wcf\util\StringUtil;
 
-class QuoteHtmlOutputNode implements IHtmlOutputNode {
+class HtmlOutputNodeBlockquote implements IHtmlOutputNode {
 	/**
 	 * @var ApplicationHandler
 	 */
@@ -59,12 +59,12 @@ class QuoteHtmlOutputNode implements IHtmlOutputNode {
 		}
 		*/
 		
-		WCF::getTPL()->assign(array(
+		WCF::getTPL()->assign([
 			'quoteLink' => $data['url'],
 			'quoteAuthor' => $data['title'],
 			'quoteAuthorObject' => $quoteAuthorObject,
 			'isExternalQuoteLink' => $externalQuoteLink
-		));
+		]);
 		return WCF::getTPL()->fetch('quoteMetaCode');
 	}
 }
\ No newline at end of file
diff --git a/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMention.class.php b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMention.class.php
new file mode 100644
index 0000000000..7f06d42a14
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/html/output/node/HtmlOutputNodeWoltlabMention.class.php
@@ -0,0 +1,74 @@
+<?php
+namespace wcf\system\html\output\node;
+
+use wcf\data\user\UserProfile;
+use wcf\data\user\UserProfileCache;
+use wcf\system\application\ApplicationHandler;
+use wcf\system\html\output\HtmlOutputNodeProcessor;
+use wcf\system\request\RouteHandler;
+use wcf\system\WCF;
+use wcf\util\StringUtil;
+
+class HtmlOutputNodeWoltlabMention implements IHtmlOutputNode {
+	/**
+	 * @var ApplicationHandler
+	 */
+	protected $applicationHandler;
+	
+	/**
+	 * @var UserProfile[]
+	 */
+	protected $userProfiles;
+	
+	/**
+	 * @var UserProfileCache
+	 */
+	protected $userProfileCache;
+	
+	public function __construct(ApplicationHandler $applicationHandler, UserProfileCache $userProfileCache) {
+		$this->applicationHandler = $applicationHandler;
+		$this->userProfileCache = $userProfileCache;
+	}
+	
+	public function process(HtmlOutputNodeProcessor $htmlOutputNodeProcessor) {
+		$this->userProfiles = [];
+		
+		$userIds = [];
+		$elements = $htmlOutputNodeProcessor->getDocument()->getElementsByTagName('woltlab-mention');
+		while ($elements->length) {
+			/** @var \DOMElement $mention */
+			$mention = $elements->item(0);
+			
+			$userId = ($mention->hasAttribute('data-user-id')) ? intval($mention->getAttribute('data-user-id')) : 0;
+			$username = ($mention->hasAttribute('data-username')) ? StringUtil::trim($mention->getAttribute('data-username')) : '';
+			
+			if ($userId === 0 || $username === '') {
+				$mention->parentNode->removeChild($mention);
+				continue;
+			}
+			
+			$userIds[] = $userId;
+			$nodeIdentifier = StringUtil::getRandomID();
+			$htmlOutputNodeProcessor->addNodeData($this, $nodeIdentifier, [
+				'userId' => $userId,
+				'username' => $username
+			]);
+			
+			$htmlOutputNodeProcessor->renameTag($mention, 'wcfNode-' . $nodeIdentifier);
+		}
+		
+		if (!empty($userIds)) {
+			$this->userProfiles = $this->userProfileCache->getUserProfiles($userIds);
+		}
+	}
+	
+	public function replaceTag(array $data) {
+		WCF::getTPL()->assign([
+			'username' => $data['username'],
+			'userId' => $data['userId'],
+			'userProfile' => $this->userProfiles[$data['userId']]
+		]);
+		
+		return WCF::getTPL()->fetch('htmlNodeWoltlabMention');
+	}
+}
\ No newline at end of file
diff --git a/wcfsetup/install/files/lib/system/session/SessionHandler.class.php b/wcfsetup/install/files/lib/system/session/SessionHandler.class.php
index 3440a6366a..6b07b360c8 100644
--- a/wcfsetup/install/files/lib/system/session/SessionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/session/SessionHandler.class.php
@@ -874,13 +874,13 @@ class SessionHandler extends SingletonFactory {
 			'requestMethod' => $this->requestMethod,
 			'lastActivityTime' => TIME_NOW
 		);
-		if (!class_exists('wcf\system\CLIWCF', false) && PACKAGE_ID && RequestHandler::getInstance()->getActiveRequest() && RequestHandler::getInstance()->getActiveRequest()->getRequestObject() instanceof ITrackablePage && RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->isTracked()) {
+		/*if (!class_exists('wcf\system\CLIWCF', false) && PACKAGE_ID && RequestHandler::getInstance()->getActiveRequest() && RequestHandler::getInstance()->getActiveRequest()->getRequestObject() instanceof ITrackablePage && RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->isTracked()) {
 			$data['controller'] = RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->getController();
 			$data['parentObjectType'] = RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->getParentObjectType();
 			$data['parentObjectID'] = RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->getParentObjectID();
 			$data['objectType'] = RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->getObjectType();
 			$data['objectID'] = RequestHandler::getInstance()->getActiveRequest()->getRequestObject()->getObjectID();
-		}
+		}*/
 		if ($this->variablesChanged) {
 			$data['sessionVariables'] = serialize($this->variables);
 		}
-- 
2.20.1