From 8fe914f07e1b4d41c02e127e2242e0a770535455 Mon Sep 17 00:00:00 2001
From: Arthur Schiwon <blizzz@arthur-schiwon.de>
Date: Thu, 15 Mar 2018 14:16:43 +0100
Subject: [PATCH] LDAP backend to emit announce and revoke signals on mapping
 changes

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>
---
 apps/user_ldap/ajax/clearMappings.php         | 22 +++++++++++-----
 apps/user_ldap/lib/Access.php                 |  2 ++
 .../user_ldap/lib/Mapping/AbstractMapping.php | 26 +++++++++++++++++++
 apps/user_ldap/lib/User_LDAP.php              |  2 +-
 .../tests/Mapping/AbstractMappingTest.php     | 23 ++++++++++++++++
 5 files changed, 68 insertions(+), 7 deletions(-)

diff --git a/apps/user_ldap/ajax/clearMappings.php b/apps/user_ldap/ajax/clearMappings.php
index 01b6b7f0ef..009a491d34 100644
--- a/apps/user_ldap/ajax/clearMappings.php
+++ b/apps/user_ldap/ajax/clearMappings.php
@@ -33,13 +33,23 @@ use OCA\User_LDAP\Mapping\GroupMapping;
 
 $subject = (string)$_POST['ldap_clear_mapping'];
 $mapping = null;
-if($subject === 'user') {
-	$mapping = new UserMapping(\OC::$server->getDatabaseConnection());
-} else if($subject === 'group') {
-	$mapping = new GroupMapping(\OC::$server->getDatabaseConnection());
-}
 try {
-	if(is_null($mapping) || !$mapping->clear()) {
+	if($subject === 'user') {
+		$mapping = new UserMapping(\OC::$server->getDatabaseConnection());
+		$result = $mapping->clearCb(
+			function ($uid) {
+				\OC::$server->getUserManager()->emit('\OC\User', 'preRevokeUser', [$uid]);
+			},
+			function ($uid) {
+				\OC::$server->getUserManager()->emit('\OC\User', 'postRevokeUser', [$uid]);
+			}
+		);
+	} else if($subject === 'group') {
+		$mapping = new GroupMapping(\OC::$server->getDatabaseConnection());
+		$result = $mapping->clear();
+	}
+
+	if($mapping === null || !$result) {
 		$l = \OC::$server->getL10N('user_ldap');
 		throw new \Exception($l->t('Failed to clear the mappings.'));
 	}
diff --git a/apps/user_ldap/lib/Access.php b/apps/user_ldap/lib/Access.php
index 9fb3709027..c9a7cd557a 100644
--- a/apps/user_ldap/lib/Access.php
+++ b/apps/user_ldap/lib/Access.php
@@ -609,6 +609,7 @@ class Access extends LDAPUtility implements IUserTools {
 			|| (!$isUser && !\OC::$server->getGroupManager()->groupExists($intName))) {
 			if($mapper->map($fdn, $intName, $uuid)) {
 				$this->connection->setConfiguration(array('ldapCacheTTL' => $originalTTL));
+				\OC::$server->getUserManager()->emit('\OC\User', 'announceUser', [$intName]);
 				$newlyMapped = true;
 				return $intName;
 			}
@@ -617,6 +618,7 @@ class Access extends LDAPUtility implements IUserTools {
 
 		$altName = $this->createAltInternalOwnCloudName($intName, $isUser);
 		if(is_string($altName) && $mapper->map($fdn, $altName, $uuid)) {
+			\OC::$server->getUserManager()->emit('\OC\User', 'announceUser', [$intName]);
 			$newlyMapped = true;
 			return $altName;
 		}
diff --git a/apps/user_ldap/lib/Mapping/AbstractMapping.php b/apps/user_ldap/lib/Mapping/AbstractMapping.php
index f5f56ce03d..c7d737a763 100644
--- a/apps/user_ldap/lib/Mapping/AbstractMapping.php
+++ b/apps/user_ldap/lib/Mapping/AbstractMapping.php
@@ -278,6 +278,32 @@ abstract class AbstractMapping {
 		return $this->dbc->prepare($sql)->execute();
 	}
 
+	/**
+	 * clears the mapping table one by one and executing a callback with
+	 * each row's id (=owncloud_name col)
+	 *
+	 * @param callable $preCallback
+	 * @param callable $postCallback
+	 * @return bool true on success, false when at least one row was not
+	 * deleted
+	 */
+	public function clearCb(Callable $preCallback, Callable $postCallback): bool {
+		$picker = $this->dbc->getQueryBuilder();
+		$picker->select('owncloud_name')
+			->from($this->getTableName());
+		$cursor = $picker->execute();
+		$result = true;
+		while($id = $cursor->fetchColumn(0)) {
+			$preCallback($id);
+			if($isUnmapped = $this->unmap($id)) {
+				$postCallback($id);
+			}
+			$result &= $isUnmapped;
+		}
+		$cursor->closeCursor();
+		return $result;
+	}
+
 	/**
 	 * returns the number of entries in the mappings table
 	 *
diff --git a/apps/user_ldap/lib/User_LDAP.php b/apps/user_ldap/lib/User_LDAP.php
index 5a2b993c33..3868645cae 100644
--- a/apps/user_ldap/lib/User_LDAP.php
+++ b/apps/user_ldap/lib/User_LDAP.php
@@ -396,7 +396,7 @@ class User_LDAP extends BackendUtility implements \OCP\IUserBackend, \OCP\UserIn
 		\OC::$server->getLogger()->info('Cleaning up after user ' . $uid,
 			array('app' => 'user_ldap'));
 
-		$this->access->getUserMapper()->unmap($uid);
+		$this->access->getUserMapper()->unmap($uid); // we don't emit revoke signals here, since it is implicit to delete signals fired from core
 		$this->access->userManager->invalidate($uid);
 		return true;
 	}
diff --git a/apps/user_ldap/tests/Mapping/AbstractMappingTest.php b/apps/user_ldap/tests/Mapping/AbstractMappingTest.php
index d3d33a82da..54d8b49cdc 100644
--- a/apps/user_ldap/tests/Mapping/AbstractMappingTest.php
+++ b/apps/user_ldap/tests/Mapping/AbstractMappingTest.php
@@ -234,6 +234,29 @@ abstract class AbstractMappingTest extends \Test\TestCase {
 		}
 	}
 
+	/**
+	 * tests clear() for successful update.
+	 */
+	public function testClearCb() {
+		list($mapper, $data) = $this->initTest();
+
+		$callbackCalls = 0;
+		$test = $this;
+
+		$callback = function (string $id) use ($test, &$callbackCalls) {
+			$test->assertTrue(trim($id) !== '');
+			$callbackCalls++;
+		};
+
+		$done = $mapper->clearCb($callback, $callback);
+		$this->assertTrue($done);
+		$this->assertSame(count($data) * 2, $callbackCalls);
+		foreach($data as $entry) {
+			$name = $mapper->getNameByUUID($entry['uuid']);
+			$this->assertFalse($name);
+		}
+	}
+
 	/**
 	 * tests getList() method
 	 */