From a4ca92f29a24de2868c7149c2cff8550bc0ca55e Mon Sep 17 00:00:00 2001
From: Roeland Jago Douma <roeland@famdouma.nl>
Date: Wed, 13 Dec 2017 20:21:00 +0100
Subject: Remove generated avatar on displayname change

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
---
 lib/private/Avatar.php | 14 ++++++++++++++
 lib/private/Server.php | 19 ++++++++++++++++++-
 lib/public/IAvatar.php |  6 ++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/lib/private/Avatar.php b/lib/private/Avatar.php
index 5893daa1804..3b1aac4b514 100644
--- a/lib/private/Avatar.php
+++ b/lib/private/Avatar.php
@@ -393,4 +393,18 @@ class Avatar implements IAvatar {
 		return array(round($r * 255), round($g * 255), round($b * 255));
 	}
 
+	public function userChanged($feature, $oldValue, $newValue) {
+		// We only change the avatar on display name changes
+		if ($feature !== 'displayName') {
+			return;
+		}
+
+		// If the avatar is not generated (so an uploaded image) we skip this
+		if (!$this->folder->fileExists('generated')) {
+			return;
+		}
+
+		$this->remove();
+	}
+
 }
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 44f5ea80cb7..4a851d67226 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -394,9 +394,10 @@ class Server extends ServerContainer implements IServerContainer {
 			$userSession->listen('\OC\User', 'logout', function () {
 				\OC_Hook::emit('OC_User', 'logout', array());
 			});
-			$userSession->listen('\OC\User', 'changeUser', function ($user, $feature, $value, $oldValue) {
+			$userSession->listen('\OC\User', 'changeUser', function ($user, $feature, $value, $oldValue) use ($dispatcher) {
 				/** @var $user \OC\User\User */
 				\OC_Hook::emit('OC_User', 'changeUser', array('run' => true, 'user' => $user, 'feature' => $feature, 'value' => $value, 'old_value' => $oldValue));
+				$dispatcher->dispatch('OCP\IUser::changeUser', new GenericEvent($user, ['feature' => $feature, 'oldValue' => $oldValue, 'value' => $value]));
 			});
 			return $userSession;
 		});
@@ -1175,6 +1176,22 @@ class Server extends ServerContainer implements IServerContainer {
 				$logger->info('Could not cleanup avatar of ' . $user->getUID());
 			}
 		});
+
+		$dispatcher->addListener('OCP\IUser::changeUser', function (GenericEvent $e) {
+			$manager = $this->getAvatarManager();
+			/** @var IUser $user */
+			$user = $e->getSubject();
+			$feature = $e->getArgument('feature');
+			$oldValue = $e->getArgument('oldValue');
+			$value = $e->getArgument('value');
+
+			try {
+				$avatar = $manager->getAvatar($user->getUID());
+				$avatar->userChanged($feature, $oldValue, $value);
+			} catch (NotFoundException $e) {
+				// no avatar to remove
+			}
+		});
 	}
 
 	/**
diff --git a/lib/public/IAvatar.php b/lib/public/IAvatar.php
index 369cafa00c1..a6731b63be9 100644
--- a/lib/public/IAvatar.php
+++ b/lib/public/IAvatar.php
@@ -77,4 +77,10 @@ interface IAvatar {
 	 * @since 9.0.0
 	 */
 	public function getFile($size);
+
+	/**
+	 * Handle a changed user
+	 * @since 13.0.0
+	 */
+	public function userChanged($feature, $oldValue, $newValue);
 }
-- 
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