ilRbacSystem Class Reference

class ilRbacSystem system function like checkAccess, addActiveRole ... More...

Collaboration diagram for ilRbacSystem:

Public Member Functions
	checkAccess ($a_operations, $a_ref_id, $a_type="")
	checkAccess represents the main method of the RBAC-system in ILIAS3 developers want to use With this method you check the permissions a use may have due to its roles on an specific object. More...
	checkAccessOfUser ($a_user_id, $a_operations, $a_ref_id, $a_type="")
	preloadRbacPaCache ($a_ref_ids, $a_user_id)
	Preload rbac_pa cache. More...
	checkPermission ($a_ref_id, $a_rol_id, $a_operation)
	check if a specific role has the permission '$a_operation' of an object public More...
	__filterOwnerPermissions ($a_user_id, $a_operations, $a_ref_id)
	initMemberView ()
	Init member view. More...
	addTemporaryRole ($a_usr_id, $a_role_id)
	resetPACache ($a_usr_id, $a_ref_id)

Static Public Member Functions
static	getInstance ()
static	resetCaches ()
	Reset internal caches. More...

Data Fields
	$ilias

Protected Member Functions
	__construct ()
	Constructor public. More...

Protected Attributes
	$mem_view

Static Protected Attributes
static	$instance = null
static	$user_role_cache = array()

Private Member Functions
	fetchAssignedRoles ($a_usr_id, $a_ref_id)
	Fetch assigned roles This method caches the assigned roles per user. More...

Static Private Attributes
static	$_paCache = null
static	$_checkAccessOfUserCache = null

Detailed Description

class ilRbacSystem system function like checkAccess, addActiveRole ...

Supporting system functions are required for session management and in making access control decisions. This class depends on the session since we offer the possiblility to add or delete active roles during one session.

Author

Stefan Meyer meyer.nosp@m.@lei.nosp@m.fos.c.nosp@m.om

Version

$Id$

Definition at line 16 of file class.ilRbacSystem.php.

Constructor & Destructor Documentation

__construct()

ilRbacSystem::__construct ( )

protected

Constructor public.

Definition at line 35 of file class.ilRbacSystem.php.

References $ilDB, $ilErr, $ilias, array, and PEAR_ERROR_CALLBACK.

    {
        global $ilDB,$ilErr,$ilias;

        $this->ilias =&$ilias;

        // set db & error handler
        (isset($ilDB)) ? $this->ilDB =&$ilDB : $this->ilDB =&$ilias->db;
        
        if (!isset($ilErr)) {
            $ilErr = new ilErrorHandling();
            $ilErr->setErrorHandling(PEAR_ERROR_CALLBACK, array($ilErr,'errorHandler'));
        } else {
            $this->ilErr =&$ilErr;
        }
    }

Member Function Documentation

__filterOwnerPermissions()

ilRbacSystem::__filterOwnerPermissions	(		$a_user_id,
			$a_operations,
			$a_ref_id
	)

Definition at line 302 of file class.ilRbacSystem.php.

References $ilUser.

Referenced by checkAccessOfUser().

    {
        global $ilObjDataCache,$ilUser;

        // member view constraints
        if ($this->mem_view['active'] and $a_user_id == $ilUser->getId()) {
            if (in_array($a_ref_id, $this->mem_view['items'])) {
                return $a_operations;
            }
        }

        if ($a_user_id != $ilObjDataCache->lookupOwner($ilObjDataCache->lookupObjId($a_ref_id))) {
            return $a_operations;
        }
        // Is owner
        $new_ops = false;
        foreach (explode(",", $a_operations) as $operation) {
            if ($operation != 'cat_administrate_users' and $operation != 'edit_permission' and $operation != 'edit_learning_progress' and $operation != 'read_learning_progress' and !preg_match('/^create/', $operation)) {
                continue;
            }
            if (!strlen($new_ops)) {
                $new_ops = $operation;
            } else {
                $new_ops .= (',' . $operation);
            }
        }
        return $new_ops;
    }

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addTemporaryRole()

ilRbacSystem::addTemporaryRole	(		$a_usr_id,
			$a_role_id
	)

Definition at line 406 of file class.ilRbacSystem.php.

    {
        if (!in_array($a_role_id, self::$user_role_cache[$a_usr_id])) {
            self::$user_role_cache[$a_usr_id][] = $a_role_id;
        }
    }

checkAccess()

ilRbacSystem::checkAccess	(		$a_operations,
			$a_ref_id,
			$a_type = ""
	)

checkAccess represents the main method of the RBAC-system in ILIAS3 developers want to use With this method you check the permissions a use may have due to its roles on an specific object.

The first parameter are the operation(s) the user must have The second & third parameter specifies the object where the operation(s) may apply to The last parameter is only required, if you ask for the 'create' operation. Here you specify the object type which you want to create.

example: $rbacSystem->checkAccess("visible,read",23); Here you ask if the user is allowed to see ('visible') and access the object by reading it ('read'). The reference_id is 23 in the tree structure.

public

Parameters

string	one or more operations, separated by commas (i.e.: visible,read,join)
integer	the child_id in tree (usually a reference_id, no object_id !!)
string	the type definition abbreviation (i.e.: frm,grp,crs)

Returns

boolean returns true if ALL passed operations are given, otherwise false

Definition at line 89 of file class.ilRbacSystem.php.

References $a_type, $ilBench, $ilUser, $result, and checkAccessOfUser().

Referenced by initMemberView().

    {
        global $ilUser,$ilBench;
        
        $ilBench->start("RBAC", "system_checkAccess");

        $result = $this->checkAccessOfUser($ilUser->getId(), $a_operations, $a_ref_id, $a_type);

        $ilBench->stop("RBAC", "system_checkAccess");
        
        return $result;
    }

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checkAccessOfUser()

ilRbacSystem::checkAccessOfUser	(		$a_user_id,
			$a_operations,
			$a_ref_id,
			$a_type = ""
	)

Definition at line 102 of file class.ilRbacSystem.php.

References $a_type, $GLOBALS, $ilDB, $ilLog, $ilUser, $r, $row, __filterOwnerPermissions(), ilRbacReview\_getOperationIdByName(), array, fetchAssignedRoles(), ilDBConstants\FETCHMODE_OBJECT, and ilDB\query().

Referenced by checkAccess().

    {
        global $ilUser, $rbacreview,$ilObjDataCache,$ilDB,$ilLog;

        // Create the user cache key
        $cacheKey = $a_user_id . ':' . $a_operations . ':' . $a_ref_id . ':' . $a_type;

        // Create the cache if it does not yet exist
        if (!is_array(self::$_checkAccessOfUserCache)) {
            self::$_checkAccessOfUserCache = array();
        }
        
        // Try to return result from cache
        if (array_key_exists($cacheKey, self::$_checkAccessOfUserCache)) {
            return self::$_checkAccessOfUserCache[$cacheKey];
        }


        // DISABLED
        // Check For owner
        // Owners do always have full access to their objects
        // Excluded are the permissions create and perm
        // This method call return all operations that are NOT granted by the owner status
        if (!$a_operations = $this->__filterOwnerPermissions($a_user_id, $a_operations, $a_ref_id)) {
            // Store positive outcome in cache.
            // Note: we only cache up to 1000 results to avoid memory overflows
            if (count(self::$_checkAccessOfUserCache) < 1000) {
                self::$_checkAccessOfUserCache[$cacheKey] = true;
            }
            return true;
        }

        
        // get roles using role cache
        $roles = $this->fetchAssignedRoles($a_user_id, $a_ref_id);
        
        // exclude system role from rbac
        if (in_array(SYSTEM_ROLE_ID, $roles)) {
            // Store positive outcome in cache.
            // Note: we only cache up to 1000 results to avoid memory overflows
            if (count(self::$_checkAccessOfUserCache) < 1000) {
                self::$_checkAccessOfUserCache[$cacheKey] = true;
            }
            return true;
        }

        if (!isset($a_operations) or !isset($a_ref_id)) {
            $GLOBALS['ilLog']->logStack();
            $this->ilErr->raiseError(get_class($this) . "::checkAccess(): Missing parameter! " .
                            "ref_id: " . $a_ref_id . " operations: " . $a_operations, $this->ilErr->WARNING);
        }

        if (!is_string($a_operations)) {
            $GLOBALS['ilLog']->logStack();
            $this->ilErr->raiseError(get_class($this) . "::checkAccess(): Wrong datatype for operations!", $this->ilErr->WARNING);
        }

        // Create the PA cache if it does not exist yet
        $paCacheKey = $a_user_id . ':' . $a_ref_id;
        if (!is_array(self::$_paCache)) {
            self::$_paCache = array();
        }

        if (array_key_exists($paCacheKey, self::$_paCache)) {
            // Return result from PA cache
            $ops = self::$_paCache[$paCacheKey];
        } else {
            // Data is not in PA cache, perform database query
            $q = "SELECT * FROM rbac_pa " .
                     "WHERE ref_id = " . $ilDB->quote($a_ref_id, 'integer');

            $r = $this->ilDB->query($q);

            $ops = array();

            while ($row = $r->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
                if (in_array($row->rol_id, $roles)) {
                    $ops = array_merge($ops, unserialize(stripslashes($row->ops_id)));
                }
            }
            // Cache up to 1000 entries in the PA cache
            if (count(self::$_paCache) < 1000) {
                self::$_paCache[$paCacheKey] = $ops;
            }
        }

        $operations = explode(",", $a_operations);
        foreach ($operations as $operation) {
            if ($operation == "create") {
                if (empty($a_type)) {
                    $this->ilErr->raiseError(
                        get_class($this) . "::CheckAccess(): Expect a type definition for checking a 'create' permission",
                        $this->ilErr->WARNING
                    );
                }

                $ops_id = ilRbacReview::_getOperationIdByName($operation . "_" . $a_type);
            } else {
                $ops_id = ilRbacReview::_getOperationIdByName($operation);
            }
            if (!in_array($ops_id, (array) $ops)) {
                //$ilLog->write('PERMISSION: '.$a_ref_id.' -> '.$a_ops_id.' failed');
                // Store negative outcome in cache.
                // Note: we only cache up to 1000 results to avoid memory overflows
                if (count(self::$_checkAccessOfUserCache) < 1000) {
                    self::$_checkAccessOfUserCache[$cacheKey] = false;
                }
                return false;
            }
        }

        // Store positive outcome in cache.
        // Note: we only cache up to 1000 results to avoid memory overflows
        if (count(self::$_checkAccessOfUserCache) < 1000) {
            //$ilLog->write('PERMISSION: '.$a_ref_id.' -> '.$ops_id.' granted');
            self::$_checkAccessOfUserCache[$cacheKey] = true;
        }
        return true;
    }

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checkPermission()

ilRbacSystem::checkPermission	(		$a_ref_id,
			$a_rol_id,
			$a_operation
	)

check if a specific role has the permission '$a_operation' of an object public

Parameters

integer	reference id of object
integer	role id
string	the permission to check

Returns

boolean

Definition at line 278 of file class.ilRbacSystem.php.

References $ilDB, $query, $res, $row, and array.

    {
        global $ilDB;
        
        $ops = array();

        $query = 'SELECT ops_id FROM rbac_operations ' .
            'WHERE operation = ' . $ilDB->quote($a_operation, 'text');
        $res = $ilDB->query($query);
        while ($row = $ilDB->fetchObject($res)) {
            $ops_id = $row->ops_id;
        }
    
        $query = "SELECT * FROM rbac_pa " .
             "WHERE rol_id = " . $ilDB->quote($a_rol_id, 'integer') . " " .
             "AND ref_id = " . $ilDB->quote($a_ref_id, 'integer') . " ";
        $res = $ilDB->query($query);

        while ($row = $ilDB->fetchObject($res)) {
            $ops = array_merge($ops, unserialize($row->ops_id));
        }
        return in_array($ops_id, $ops);
    }

fetchAssignedRoles()

ilRbacSystem::fetchAssignedRoles (   $a_usr_id,   $a_ref_id  )

private

Fetch assigned roles This method caches the assigned roles per user.

private

Parameters

int

user id

Definition at line 339 of file class.ilRbacSystem.php.

References $ilUser, and array.

Referenced by checkAccessOfUser(), and preloadRbacPaCache().

    {
        global $ilUser,$rbacreview;
        
        // Member view constraints
        if ($this->mem_view['active'] and $a_usr_id == $ilUser->getId()) {
            // check if current ref_id is subitem of active container
            if (in_array($a_ref_id, $this->mem_view['items']) and $this->mem_view['role']) {
                // Return default member role
                return array($this->mem_view['role']);
            }
        }

        if (isset(self::$user_role_cache[$a_usr_id]) and is_array(self::$user_role_cache)) {
            return self::$user_role_cache[$a_usr_id];
        }



        return self::$user_role_cache[$a_usr_id] = $rbacreview->assignedRoles($a_usr_id);
    }

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getInstance()

static ilRbacSystem::getInstance ( )

static

Definition at line 52 of file class.ilRbacSystem.php.

Referenced by ilInitialisation\initAccessHandling().

    {
        if (self::$instance) {
            return self::$instance;
        }
        return self::$instance = new ilRbacSystem();
    }

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initMemberView()

ilRbacSystem::initMemberView

(

)

Init member view.

Returns

Definition at line 365 of file class.ilRbacSystem.php.

References $_GET, array, checkAccess(), ilParticipants\getDefaultMemberRole(), and ilMemberViewSettings\getInstance().

    {
        include_once './Services/Container/classes/class.ilMemberViewSettings.php';
        $settings = ilMemberViewSettings::getInstance();
        
        // disable member view
        if (
            isset($_GET['mv']) &&
            $_GET['mv'] == 0
        ) {
            // force deactivation
            $settings->toggleActivation((int) $_GET['ref_id'], false);
        }
        if (
            isset($_GET['mv']) &&
            $_GET['mv'] == 1
        ) {
            if ($this->checkAccess('write', (int) $_GET['ref_id'])) {
                $settings->toggleActivation((int) $_GET['ref_id'], true);
                // reset caches
                self::resetCaches();
            }
        }
        
        if (!$settings->isActive()) {
            $this->mem_view['active'] = false;
            $this->mem_view['items'] = array();
            $this->mem_view['role'] = 0;
        } else {
            global $tree;
            
            $this->mem_view['active'] = true;
            $this->mem_view['items'] = $tree->getSubTreeIds($settings->getContainer());
            $this->mem_view['items'] = array_merge($this->mem_view['items'], array($settings->getContainer()));
            
            include_once './Services/Membership/classes/class.ilParticipants.php';
            $this->mem_view['role'] = ilParticipants::getDefaultMemberRole($settings->getContainer());
        }
        return true;
    }

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preloadRbacPaCache()

ilRbacSystem::preloadRbacPaCache	(		$a_ref_ids,
			$a_user_id
	)

Preload rbac_pa cache.

Parameters

Definition at line 228 of file class.ilRbacSystem.php.

References $ilDB, $r, $row, array, fetchAssignedRoles(), ilDBConstants\FETCHMODE_OBJECT, and ilDB\query().

    {
        global $ilDB;

        if (!is_array($a_ref_ids)) {
            return;
        }

        $ref_ids = array();
        foreach ($a_ref_ids as $ref_id) {
            if (!isset(self::$_paCache[$a_user_id . ":" . $ref_id])) {
                $roles[$ref_id] = $this->fetchAssignedRoles($a_user_id, $ref_id);
                $ops[$ref_id] = array();
                $ref_ids[] = $ref_id;
            }
        }

        if (count($ref_ids) > 0) {

            // Data is not in PA cache, perform database query
            $q = "SELECT * FROM rbac_pa " .
                "WHERE " . $ilDB->in("ref_id", $ref_ids, false, "integer");

            $r = $this->ilDB->query($q);

            while ($row = $r->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
                if (in_array($row->rol_id, $roles[$row->ref_id])) {
                    $ops[$row->ref_id] = array_merge(
                        $ops[$row->ref_id],
                        unserialize(stripslashes($row->ops_id))
                    );
                }
            }
            foreach ($a_ref_ids as $ref_id) {
                // #11313
                if (!isset(self::$_paCache[$a_user_id . ":" . $ref_id])) {
                    self::$_paCache[$a_user_id . ":" . $ref_id] = $ops[$ref_id];
                }
            }
        }
    }

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resetCaches()

static ilRbacSystem::resetCaches ( )

static

Reset internal caches.

Definition at line 63 of file class.ilRbacSystem.php.

References array.

Referenced by ilObjSessionGUI\unregisterObject().

    {
        self::$user_role_cache = array();
        self::$_paCache = null;
        self::$_checkAccessOfUserCache = null;
    }

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resetPACache()

ilRbacSystem::resetPACache	(		$a_usr_id,
			$a_ref_id
	)

Definition at line 413 of file class.ilRbacSystem.php.

    {
        $paCacheKey = $a_usr_id . ':' . $a_ref_id;
        unset(self::$_paCache[$paCacheKey]);
    }

Field Documentation

$_checkAccessOfUserCache

ilRbacSystem::$_checkAccessOfUserCache = null

staticprivate

Definition at line 29 of file class.ilRbacSystem.php.

$_paCache

ilRbacSystem::$_paCache = null

staticprivate

Definition at line 26 of file class.ilRbacSystem.php.

$ilias

ilRbacSystem::$ilias

Definition at line 23 of file class.ilRbacSystem.php.

Referenced by __construct().

$instance

ilRbacSystem::$instance = null

staticprotected

Definition at line 18 of file class.ilRbacSystem.php.

$mem_view

ilRbacSystem::$mem_view

protected

Definition at line 20 of file class.ilRbacSystem.php.

$user_role_cache

ilRbacSystem::$user_role_cache = array()

staticprotected

Definition at line 22 of file class.ilRbacSystem.php.

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The documentation for this class was generated from the following file:

• Services/AccessControl/classes/class.ilRbacSystem.php