Generate individual default cover photos for users

com.woltlab.wcf/option.xml

@@ -1202,6 +1202,13 @@ silhouette:wcf.acp.option.avatar_default_type.silhouette</selectoptions>
 				<optiontype>boolean</optiontype>
 				<defaultvalue>1</defaultvalue>
 			</option>
+			<option name="user_cover_photo_default_type">
+				<categoryname>user.profile</categoryname>
+				<optiontype>select</optiontype>
+				<defaultvalue>generated</defaultvalue>
+				<selectoptions>generated:wcf.acp.option.user_cover_photo_default_type.generated
+style:wcf.acp.option.user_cover_photo_default_type.style</selectoptions>
+			</option>
 			<!-- /user.profile -->
 			<!-- user.list.members -->
 			<option name="members_list_users_per_page">

com.woltlab.wcf/templates/userProfileHeader.tpl

@@ -30,7 +30,7 @@
 			{if $view->canEditCoverPhoto()}
 				<ul class="userProfileManageCoverPhoto buttonGroup buttonList smallButtons">
 					<li>
-						<button type="button" data-edit-cover-photo="{link controller="UserCoverPhoto" id=$user->userID}{/link}" data-default-cover-photo="{$__wcf->styleHandler->getStyle()->getCoverPhotoUrl()}" class="button small">
+						<button type="button" data-edit-cover-photo="{link controller="UserCoverPhoto" id=$user->userID}{/link}" data-default-cover-photo="{$view->user->getDefaultCoverPhoto()->getURL()}" class="button small">
 							{icon name='camera'}
 							<span>{lang}wcf.user.coverPhoto.edit{/lang}</span>
 						</button>

constants.php

@@ -179,6 +179,7 @@
 \define('OG_IMAGE', '');
 \define('HEAD_CODE', '');
 \define('AVATAR_DEFAULT_TYPE', 'initials');
+\define('USER_COVER_PHOTO_DEFAULT_TYPE', 'generated');
 \define('ARTICLE_ENABLE_VISIT_TRACKING', 1);
 \define('ENABLE_AD_ROTATION', 1);
 \define('ENABLE_POLLING', 1);

phpstan-ambient.neon

@@ -181,6 +181,7 @@ parameters:
         - OG_IMAGE
         - HEAD_CODE
         - AVATAR_DEFAULT_TYPE
+        - USER_COVER_PHOTO_DEFAULT_TYPE
         - ARTICLE_ENABLE_VISIT_TRACKING
         - ENABLE_AD_ROTATION
         - ENABLE_POLLING

wcfsetup/install/files/lib/data/user/UserProfile.class.php

@@ -12,6 +12,7 @@
 use wcf\data\user\avatar\IUserAvatar;
 use wcf\data\user\avatar\StaticAvatar;
 use wcf\data\user\cover\photo\DefaultUserCoverPhoto;
+use wcf\data\user\cover\photo\GeneratedUserCoverPhoto;
 use wcf\data\user\cover\photo\IUserCoverPhoto;
 use wcf\data\user\cover\photo\UserCoverPhoto;
 use wcf\data\user\group\UserGroup;
@@ -437,13 +438,29 @@ public function getCoverPhoto(bool $isACP = false)
 
             // use default cover photo
             if ($this->coverPhoto === null) {
-                $this->coverPhoto = new DefaultUserCoverPhoto();
+                $this->coverPhoto = $this->getDefaultCoverPhoto();
             }
         }
 
         return $this->coverPhoto;
     }
 
+    /**
+     * Returns the cover photo that is shown if the user has no cover photo. Depending
+     * on the option `USER_COVER_PHOTO_DEFAULT_TYPE`, this is either the cover photo of
+     * the style or an individual cover photo that is generated for each user.
+     *
+     * @since 6.3
+     */
+    public function getDefaultCoverPhoto(): IUserCoverPhoto
+    {
+        if (\USER_COVER_PHOTO_DEFAULT_TYPE === 'generated') {
+            return new GeneratedUserCoverPhoto($this->username);
+        }
+
+        return new DefaultUserCoverPhoto();
+    }
+
     /**
      * Returns true if the active user can view the cover photo of this user.
      *

wcfsetup/install/files/lib/data/user/cover/photo/GeneratedUserCoverPhoto.class.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace wcf\data\user\cover\photo;
+
+use wcf\system\image\cover\photo\generator\CoverPhotoGenerator;
+
+/**
+ * Represents a default cover photo that is generated for each user individually.
+ *
+ * @author      Marcel Werk
+ * @copyright   2001-2026 WoltLab GmbH
+ * @license     GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @since       6.3
+ */
+final class GeneratedUserCoverPhoto extends DefaultUserCoverPhoto
+{
+    private string $url;
+
+    public function __construct(
+        private readonly string $username,
+    ) {}
+
+    #[\Override]
+    public function getURL(?bool $forceWebP = null): string
+    {
+        if (!isset($this->url)) {
+            $this->url = CoverPhotoGenerator::forActiveStyle()->getDataUri('user-' . \mb_strtolower($this->username));
+        }
+
+        return $this->url;
+    }
+}