From 1f1fcc61298e1ce8b32a16824da0e44671bb30f5 Mon Sep 17 00:00:00 2001
From: Morris Jobke <morris.jobke@gmail.com>
Date: Fri, 18 Oct 2013 11:37:13 +0200
Subject: [PATCH] Remove "link" shares right after disabling the
 "allow_link_share" setting

---
 apps/files_sharing/appinfo/app.php    |  2 ++
 apps/files_sharing/lib/maintainer.php | 44 +++++++++++++++++++++++++++
 lib/private/appconfig.php             |  6 ++++
 lib/public/share.php                  | 12 ++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 apps/files_sharing/lib/maintainer.php

diff --git a/apps/files_sharing/appinfo/app.php b/apps/files_sharing/appinfo/app.php
index ffdcbf0510..bdaea64bb9 100644
--- a/apps/files_sharing/appinfo/app.php
+++ b/apps/files_sharing/appinfo/app.php
@@ -8,6 +8,7 @@ OC::$CLASSPATH['OC\Files\Cache\Shared_Permissions'] = 'files_sharing/lib/permiss
 OC::$CLASSPATH['OC\Files\Cache\Shared_Updater'] = 'files_sharing/lib/updater.php';
 OC::$CLASSPATH['OC\Files\Cache\Shared_Watcher'] = 'files_sharing/lib/watcher.php';
 OC::$CLASSPATH['OCA\Files\Share\Api'] = 'files_sharing/lib/api.php';
+OC::$CLASSPATH['OCA\Files\Share\Maintainer'] = 'files_sharing/lib/maintainer.php';
 OCP\Util::connectHook('OC_Filesystem', 'setup', '\OC\Files\Storage\Shared', 'setup');
 OCP\Share::registerBackend('file', 'OC_Share_Backend_File');
 OCP\Share::registerBackend('folder', 'OC_Share_Backend_Folder', 'file');
@@ -17,3 +18,4 @@ OCP\Util::addScript('files_sharing', 'share');
 \OC_Hook::connect('OC_Filesystem', 'post_rename', '\OC\Files\Cache\Shared_Updater', 'renameHook');
 \OC_Hook::connect('OCP\Share', 'post_shared', '\OC\Files\Cache\Shared_Updater', 'shareHook');
 \OC_Hook::connect('OCP\Share', 'pre_unshare', '\OC\Files\Cache\Shared_Updater', 'shareHook');
+\OC_Hook::connect('OC_Appconfig', 'post_set_value', '\OCA\Files\Share\Maintainer', 'configChangeHook');
diff --git a/apps/files_sharing/lib/maintainer.php b/apps/files_sharing/lib/maintainer.php
new file mode 100644
index 0000000000..bbb3268410
--- /dev/null
+++ b/apps/files_sharing/lib/maintainer.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Morris Jobke
+ * @copyright 2013 Morris Jobke morris.jobke@gmail.com
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\Files\Share;
+
+/**
+ * Maintains stuff around the sharing functionality
+ *
+ * for example: on disable of "allow links" it removes all link shares
+ */
+
+class Maintainer {
+
+	/**
+	 * Keeps track of the "allow links" config setting
+	 * and removes all link shares if the config option is set to "no"
+	 *
+	 * @param array with app, key, value as named values
+	 */
+	static public function configChangeHook($params) {
+		if($params['app'] === 'core' && $params['key'] === 'shareapi_allow_links' && $params['value'] === 'no') {
+			\OCP\Share::removeAllLinkShares();
+		}
+	}
+
+}
diff --git a/lib/private/appconfig.php b/lib/private/appconfig.php
index e615d83817..4f170e054e 100644
--- a/lib/private/appconfig.php
+++ b/lib/private/appconfig.php
@@ -134,6 +134,12 @@ class OC_Appconfig{
 				.' WHERE `appid` = ? AND `configkey` = ?' );
 			$query->execute( array( $value, $app, $key ));
 		}
+		// TODO where should this be documented?
+		\OC_Hook::emit('OC_Appconfig', 'post_set_value', array(
+			'app' => $app,
+			'key' => $key,
+			'value' => $value
+		));
 	}
 
 	/**
diff --git a/lib/public/share.php b/lib/public/share.php
index 2847f9e5ec..59150e1964 100644
--- a/lib/public/share.php
+++ b/lib/public/share.php
@@ -1721,6 +1721,18 @@ class Share {
 		}
 	}
 
+	/**
+	 * Delete all shares with type SHARE_TYPE_LINK
+	 */
+	public static function removeAllLinkShares() {
+		// Delete any link shares
+		$query = \OC_DB::prepare('SELECT `id` FROM `*PREFIX*share` WHERE `share_type` = ?');
+		$result = $query->execute(array(self::SHARE_TYPE_LINK));
+		while ($item = $result->fetchRow()) {
+			self::delete($item['id']);
+		}
+	}
+
 	/**
 	* Hook Listeners
 	*/