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  • group.php 8.64 KiB
    <?php
    /**
     * ownCloud
     *
     * @author Frank Karlitschek
     * @copyright 2012 Frank Karlitschek frank@owncloud.org
     *
     * 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/>.
     *
     */
    
    /**
     * This class provides all methods needed for managing groups.
     *
     * Hooks provided:
     *   pre_createGroup(&run, gid)
     *   post_createGroup(gid)
     *   pre_deleteGroup(&run, gid)
     *   post_deleteGroup(gid)
     *   pre_addToGroup(&run, uid, gid)
     *   post_addToGroup(uid, gid)
     *   pre_removeFromGroup(&run, uid, gid)
     *   post_removeFromGroup(uid, gid)
     */
    class OC_Group {
    	// The backend used for group management
    	/**
    	 * @var OC_Group_Interface[]
    	 */
    	private static $_usedBackends = array();
    
    	/**
    	 * @brief set the group backend
    	 * @param  string  $backend  The backend to use for user managment
    	 * @return bool
    	 */
    	public static function useBackend( $backend ) {
    		if($backend instanceof OC_Group_Interface) {
    			self::$_usedBackends[]=$backend;
    		}
    	}
    
    	/**
    	 * remove all used backends
    	 */
    	public static function clearBackends() {
    		self::$_usedBackends=array();
    	}
    
    	/**
    	 * @brief Try to create a new group
    	 * @param string $gid The name of the group to create
    	 * @return bool
    	 *
    	 * Tries to create a new group. If the group name already exists, false will
    	 * be returned. Basic checking of Group name
    	 */
    	public static function createGroup( $gid ) {
    		// No empty group names!
    		if( !$gid ) {
    			return false;
    		}
    		// No duplicate group names
    		if( in_array( $gid, self::getGroups())) {
    			return false;
    		}
    
    		$run = true;
    		OC_Hook::emit( "OC_Group", "pre_createGroup", array( "run" => &$run, "gid" => $gid ));
    
    		if($run) {
    			//create the group in the first backend that supports creating groups
    			foreach(self::$_usedBackends as $backend) {
    				if(!$backend->implementsActions(OC_GROUP_BACKEND_CREATE_GROUP))
    					continue;
    
    				$backend->createGroup($gid);
    				OC_Hook::emit( "OC_User", "post_createGroup", array( "gid" => $gid ));
    
    				return true;
    			}
    			return false;
    		}else{
    			return false;
    		}
    	}
    
    	/**
    	 * @brief delete a group
    	 * @param string $gid gid of the group to delete
    	 * @return bool
    	 *
    	 * Deletes a group and removes it from the group_user-table
    	 */
    	public static function deleteGroup( $gid ) {
    		// Prevent users from deleting group admin
    		if( $gid == "admin" ) {
    			return false;
    		}
    
    		$run = true;
    		OC_Hook::emit( "OC_Group", "pre_deleteGroup", array( "run" => &$run, "gid" => $gid ));
    
    		if($run) {
    			//delete the group from all backends
    			foreach(self::$_usedBackends as $backend) {
    				if(!$backend->implementsActions(OC_GROUP_BACKEND_DELETE_GROUP))
    					continue;
    
    				$backend->deleteGroup($gid);
    				OC_Hook::emit( "OC_User", "post_deleteGroup", array( "gid" => $gid ));
    
    				return true;
    			}
    			return false;
    		}else{
    			return false;
    		}
    	}
    
    	/**
    	 * @brief is user in group?
    	 * @param string $uid uid of the user
    	 * @param string $gid gid of the group
    	 * @return bool
    	 *
    	 * Checks whether the user is member of a group or not.
    	 */
    	public static function inGroup( $uid, $gid ) {
    		foreach(self::$_usedBackends as $backend) {
    			if($backend->inGroup($uid, $gid)) {
    				return true;
    			}
    		}
    		return false;
    	}
    
    	/**
    	 * @brief Add a user to a group
    	 * @param string $uid Name of the user to add to group
    	 * @param string $gid Name of the group in which add the user
    	 * @return bool
    	 *
    	 * Adds a user to a group.
    	 */
    	public static function addToGroup( $uid, $gid ) {
    		// Does the group exist?
    		if( !OC_Group::groupExists($gid)) {
    			return false;
    		}
    
    		// Go go go
    		$run = true;
    		OC_Hook::emit( "OC_Group", "pre_addToGroup", array( "run" => &$run, "uid" => $uid, "gid" => $gid ));
    
    		if($run) {
    			$success=false;
    
    			//add the user to the all backends that have the group
    			foreach(self::$_usedBackends as $backend) {
    				if(!$backend->implementsActions(OC_GROUP_BACKEND_ADD_TO_GROUP))
    					continue;
    
    				if($backend->groupExists($gid)) {
    					$success|=$backend->addToGroup($uid, $gid);
    				}
    			}
    			if($success) {
    				OC_Hook::emit( "OC_User", "post_addToGroup", array( "uid" => $uid, "gid" => $gid ));
    			}
    			return $success;
    		}else{
    			return false;
    		}
    	}
    
    	/**
    	 * @brief Removes a user from a group
    	 * @param string $uid Name of the user to remove from group
    	 * @param string $gid Name of the group from which remove the user
    	 * @return bool
    	 *
    	 * removes the user from a group.
    	 */
    	public static function removeFromGroup( $uid, $gid ) {
    		$run = true;
    		OC_Hook::emit( "OC_Group", "pre_removeFromGroup", array( "run" => &$run, "uid" => $uid, "gid" => $gid ));
    
    		if($run) {
    			//remove the user from the all backends that have the group
    			foreach(self::$_usedBackends as $backend) {
    				if(!$backend->implementsActions(OC_GROUP_BACKEND_REMOVE_FROM_GOUP))
    					continue;
    
    				$backend->removeFromGroup($uid, $gid);
    				OC_Hook::emit( "OC_User", "post_removeFromGroup", array( "uid" => $uid, "gid" => $gid ));
    			}
    			return true;
    		}else{
    			return false;
    		}
    	}
    
    	/**
    	 * @brief Get all groups a user belongs to
    	 * @param string $uid Name of the user
    	 * @return array with group names
    	 *
    	 * This function fetches all groups a user belongs to. It does not check
    	 * if the user exists at all.
    	 */
    	public static function getUserGroups( $uid ) {
    		$groups=array();
    		foreach(self::$_usedBackends as $backend) {
    			$groups=array_merge($backend->getUserGroups($uid), $groups);
    		}
    		asort($groups);
    		return $groups;
    	}
    
    	/**
    	 * @brief get a list of all groups
    	 * @returns array with group names
    	 *
    	 * Returns a list with all groups
    	 */
    	public static function getGroups($search = '', $limit = -1, $offset = 0) {
    		$groups = array();
    		foreach (self::$_usedBackends as $backend) {
    			$groups = array_merge($backend->getGroups($search, $limit, $offset), $groups);
    		}
    		asort($groups);
    		return $groups;
    	}
    
    	/**
    	 * check if a group exists
    	 * @param string $gid
    	 * @return bool
    	 */
    	public static function groupExists($gid) {
    		foreach(self::$_usedBackends as $backend) {
    			if ($backend->groupExists($gid)) {
    				return true;
    			}
    		}
    		return false;
    	}
    
    	/**
    	 * @brief get a list of all users in a group
    	 * @returns array with user ids
    	 */
    	public static function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
    		$users=array();
    		foreach(self::$_usedBackends as $backend) {
    			$users = array_merge($backend->usersInGroup($gid, $search, $limit, $offset), $users);
    		}
    		return $users;
    	}
    
    	/**
    	 * @brief get a list of all users in several groups
    	 * @param array $gids
    	 * @param string $search
    	 * @param int $limit
    	 * @param int $offset
    	 * @return array with user ids
    	 */
    	public static function usersInGroups($gids, $search = '', $limit = -1, $offset = 0) {
    		$users = array();
    		foreach ($gids as $gid) {
    			// TODO Need to apply limits to groups as total
    			$users = array_merge(array_diff(self::usersInGroup($gid, $search, $limit, $offset), $users), $users);
    		}
    		return $users;
    	}
    
    	/**
    	 * @brief get a list of all display names in a group
    	 * @returns array with display names (value) and user ids(key)
    	 */
    	public static function displayNamesInGroup($gid, $search = '', $limit = -1, $offset = 0) {
    		$displayNames=array();
    		foreach(self::$_usedBackends as $backend) {
    			if($backend->implementsActions(OC_GROUP_BACKEND_GET_DISPLAYNAME)) {
    				$displayNames = array_merge($backend->displayNamesInGroup($gid, $search, $limit, $offset), $displayNames);
    			} else {
    				$users = $backend->usersInGroup($gid, $search, $limit, $offset);
    				$names = array_combine($users, $users);
    				$displayNames = array_merge($names, $displayNames);
    			}
    		}
    		return $displayNames;
    	}
    
    	/**
    	 * @brief get a list of all display names in several groups
    	 * @param array $gids
    	 * @param string $search
    	 * @param int $limit
    	 * @param int $offset
    	 * @return array with display names (Key) user ids (value)
    	 */
    	public static function displayNamesInGroups($gids, $search = '', $limit = -1, $offset = 0) {
    		$displayNames = array();
    		foreach ($gids as $gid) {
    			// TODO Need to apply limits to groups as total
    			$diff = array_diff(
    				self::displayNamesInGroup($gid, $search, $limit, $offset),
    				$displayNames
    			);
    			if ($diff) {
    				$displayNames = array_merge($diff, $displayNames);
    			}
    		}
    		return $displayNames;
    	}
    }