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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Permissions\Acl;
class Acl implements AclInterface
{
/**
* Rule type: allow
*/
const TYPE_ALLOW = 'TYPE_ALLOW';
/**
* Rule type: deny
*/
const TYPE_DENY = 'TYPE_DENY';
/**
* Rule operation: add
*/
const OP_ADD = 'OP_ADD';
/**
* Rule operation: remove
*/
const OP_REMOVE = 'OP_REMOVE';
/**
* Role registry
*
* @var Role\Registry
*/
protected $roleRegistry = null;
/**
* Resource tree
*
* @var array
*/
protected $resources = array();
/**
* @var Role\RoleInterface
*/
protected $isAllowedRole = null;
/**
* @var Resource
*/
protected $isAllowedResource = null;
/**
* @var string
*/
protected $isAllowedPrivilege = null;
/**
* ACL rules; whitelist (deny everything to all) by default
*
* @var array
*/
protected $rules = array(
'allResources' => array(
'allRoles' => array(
'allPrivileges' => array(
'type' => self::TYPE_DENY,
'assert' => null
),
'byPrivilegeId' => array()
),
'byRoleId' => array()
),
'byResourceId' => array()
);
/**
* Adds a Role having an identifier unique to the registry
*
* The $parents parameter may be a reference to, or the string identifier for,
* a Role existing in the registry, or $parents may be passed as an array of
* these - mixing string identifiers and objects is ok - to indicate the Roles
* from which the newly added Role will directly inherit.
*
* In order to resolve potential ambiguities with conflicting rules inherited
* from different parents, the most recently added parent takes precedence over
* parents that were previously added. In other words, the first parent added
* will have the least priority, and the last parent added will have the
* highest priority.
*
* @param Role\RoleInterface $role
* @param Role\RoleInterface|string|array $parents
* @throws Exception\InvalidArgumentException
* @return Acl Provides a fluent interface
*/
public function addRole($role, $parents = null)
{
if (is_string($role)) {
$role = new Role\GenericRole($role);
} elseif (!$role instanceof Role\RoleInterface) {
throw new Exception\InvalidArgumentException(
'addRole() expects $role to be of type Zend\Permissions\Acl\Role\RoleInterface'
);
}
$this->getRoleRegistry()->add($role, $parents);
return $this;
}
/**
* Returns the identified Role
*
* The $role parameter can either be a Role or Role identifier.
*
* @param Role\RoleInterface|string $role
* @return Role\RoleInterface
*/
public function getRole($role)
{
return $this->getRoleRegistry()->get($role);
}
/**
* Returns true if and only if the Role exists in the registry
*
* The $role parameter can either be a Role or a Role identifier.
*
* @param Role\RoleInterface|string $role
* @return bool
*/
public function hasRole($role)
{
return $this->getRoleRegistry()->has($role);
}
/**
* Returns true if and only if $role inherits from $inherit
*
* Both parameters may be either a Role or a Role identifier. If
* $onlyParents is true, then $role must inherit directly from
* $inherit in order to return true. By default, this method looks
* through the entire inheritance DAG to determine whether $role
* inherits from $inherit through its ancestor Roles.
*
* @param Role\RoleInterface|string $role
* @param Role\RoleInterface|string $inherit
* @param bool $onlyParents
* @return bool
*/
public function inheritsRole($role, $inherit, $onlyParents = false)
{
return $this->getRoleRegistry()->inherits($role, $inherit, $onlyParents);
}
/**
* Removes the Role from the registry
*
* The $role parameter can either be a Role or a Role identifier.
*
* @param Role\RoleInterface|string $role
* @return Acl Provides a fluent interface
*/
public function removeRole($role)
{
$this->getRoleRegistry()->remove($role);
if ($role instanceof Role\RoleInterface) {
$roleId = $role->getRoleId();
} else {
$roleId = $role;
}
foreach ($this->rules['allResources']['byRoleId'] as $roleIdCurrent => $rules) {
if ($roleId === $roleIdCurrent) {
unset($this->rules['allResources']['byRoleId'][$roleIdCurrent]);
}
}
foreach ($this->rules['byResourceId'] as $resourceIdCurrent => $visitor) {
if (array_key_exists('byRoleId', $visitor)) {
foreach ($visitor['byRoleId'] as $roleIdCurrent => $rules) {
if ($roleId === $roleIdCurrent) {
unset($this->rules['byResourceId'][$resourceIdCurrent]['byRoleId'][$roleIdCurrent]);
}
}
}
}
return $this;
}
/**
* Removes all Roles from the registry
*
* @return Acl Provides a fluent interface
*/
public function removeRoleAll()
{
$this->getRoleRegistry()->removeAll();
foreach ($this->rules['allResources']['byRoleId'] as $roleIdCurrent => $rules) {
unset($this->rules['allResources']['byRoleId'][$roleIdCurrent]);
}
foreach ($this->rules['byResourceId'] as $resourceIdCurrent => $visitor) {
foreach ($visitor['byRoleId'] as $roleIdCurrent => $rules) {
unset($this->rules['byResourceId'][$resourceIdCurrent]['byRoleId'][$roleIdCurrent]);
}
}
return $this;
}
/**
* Adds a Resource having an identifier unique to the ACL
*
* The $parent parameter may be a reference to, or the string identifier for,
* the existing Resource from which the newly added Resource will inherit.
*
* @param Resource\ResourceInterface|string $resource
* @param Resource\ResourceInterface|string $parent
* @throws Exception\InvalidArgumentException
* @return Acl Provides a fluent interface
*/
public function addResource($resource, $parent = null)
{
if (is_string($resource)) {
$resource = new Resource\GenericResource($resource);
} elseif (!$resource instanceof Resource\ResourceInterface) {
throw new Exception\InvalidArgumentException(
'addResource() expects $resource to be of type Zend\Permissions\Acl\Resource\ResourceInterface'
);
}
$resourceId = $resource->getResourceId();
if ($this->hasResource($resourceId)) {
throw new Exception\InvalidArgumentException("Resource id '$resourceId' already exists in the ACL");
}
$resourceParent = null;
if (null !== $parent) {
try {
if ($parent instanceof Resource\ResourceInterface) {
$resourceParentId = $parent->getResourceId();
} else {
$resourceParentId = $parent;
}
$resourceParent = $this->getResource($resourceParentId);
} catch (\Exception $e) {
throw new Exception\InvalidArgumentException(sprintf(
'Parent Resource id "%s" does not exist',
$resourceParentId
), 0, $e);
}
$this->resources[$resourceParentId]['children'][$resourceId] = $resource;
}
$this->resources[$resourceId] = array(
'instance' => $resource,
'parent' => $resourceParent,
'children' => array()
);
return $this;
}
/**
* Returns the identified Resource
*
* The $resource parameter can either be a Resource or a Resource identifier.
*
* @param Resource\ResourceInterface|string $resource
* @throws Exception\InvalidArgumentException
* @return Resource
*/
public function getResource($resource)
{
if ($resource instanceof Resource\ResourceInterface) {
$resourceId = $resource->getResourceId();
} else {
$resourceId = (string) $resource;
}
if (!$this->hasResource($resource)) {
throw new Exception\InvalidArgumentException("Resource '$resourceId' not found");
}
return $this->resources[$resourceId]['instance'];
}
/**
* Returns true if and only if the Resource exists in the ACL
*
* The $resource parameter can either be a Resource or a Resource identifier.
*
* @param Resource\ResourceInterface|string $resource
* @return bool
*/
public function hasResource($resource)
{
if ($resource instanceof Resource\ResourceInterface) {
$resourceId = $resource->getResourceId();
} else {
$resourceId = (string) $resource;
}
return isset($this->resources[$resourceId]);
}
/**
* Returns true if and only if $resource inherits from $inherit
*
* Both parameters may be either a Resource or a Resource identifier. If
* $onlyParent is true, then $resource must inherit directly from
* $inherit in order to return true. By default, this method looks
* through the entire inheritance tree to determine whether $resource
* inherits from $inherit through its ancestor Resources.
*
* @param Resource\ResourceInterface|string $resource
* @param Resource\ResourceInterface|string inherit
* @param bool $onlyParent
* @throws Exception\InvalidArgumentException
* @return bool
*/
public function inheritsResource($resource, $inherit, $onlyParent = false)
{
try {
$resourceId = $this->getResource($resource)->getResourceId();
$inheritId = $this->getResource($inherit)->getResourceId();
} catch (Exception\ExceptionInterface $e) {
throw new Exception\InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
}
if (null !== $this->resources[$resourceId]['parent']) {
$parentId = $this->resources[$resourceId]['parent']->getResourceId();
if ($inheritId === $parentId) {
return true;
} elseif ($onlyParent) {
return false;
}
} else {
return false;
}
while (null !== $this->resources[$parentId]['parent']) {
$parentId = $this->resources[$parentId]['parent']->getResourceId();
if ($inheritId === $parentId) {
return true;
}
}
return false;
}
/**
* Removes a Resource and all of its children
*
* The $resource parameter can either be a Resource or a Resource identifier.
*
* @param Resource\ResourceInterface|string $resource
* @throws Exception\InvalidArgumentException
* @return Acl Provides a fluent interface
*/
public function removeResource($resource)
{
try {
$resourceId = $this->getResource($resource)->getResourceId();
} catch (Exception\ExceptionInterface $e) {
throw new Exception\InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
}
$resourcesRemoved = array($resourceId);
if (null !== ($resourceParent = $this->resources[$resourceId]['parent'])) {
unset($this->resources[$resourceParent->getResourceId()]['children'][$resourceId]);
}
foreach ($this->resources[$resourceId]['children'] as $childId => $child) {
$this->removeResource($childId);
$resourcesRemoved[] = $childId;
}
foreach ($resourcesRemoved as $resourceIdRemoved) {
foreach ($this->rules['byResourceId'] as $resourceIdCurrent => $rules) {
if ($resourceIdRemoved === $resourceIdCurrent) {
unset($this->rules['byResourceId'][$resourceIdCurrent]);
}
}
}
unset($this->resources[$resourceId]);
return $this;
}
/**
* Removes all Resources
*
* @return Acl Provides a fluent interface
*/
public function removeResourceAll()
{
foreach ($this->resources as $resourceId => $resource) {
foreach ($this->rules['byResourceId'] as $resourceIdCurrent => $rules) {
if ($resourceId === $resourceIdCurrent) {
unset($this->rules['byResourceId'][$resourceIdCurrent]);
}
}
}
$this->resources = array();
return $this;
}
/**
* Adds an "allow" rule to the ACL
*
* @param Role\RoleInterface|string|array $roles
* @param Resource\ResourceInterface|string|array $resources
* @param string|array $privileges
* @param Assertion\AssertionInterface $assert
* @return Acl Provides a fluent interface
*/
public function allow($roles = null, $resources = null, $privileges = null, Assertion\AssertionInterface $assert = null)
{
return $this->setRule(self::OP_ADD, self::TYPE_ALLOW, $roles, $resources, $privileges, $assert);
}
/**
* Adds a "deny" rule to the ACL
*
* @param Role\RoleInterface|string|array $roles
* @param Resource\ResourceInterface|string|array $resources
* @param string|array $privileges
* @param Assertion\AssertionInterface $assert
* @return Acl Provides a fluent interface
*/
public function deny($roles = null, $resources = null, $privileges = null, Assertion\AssertionInterface $assert = null)
{
return $this->setRule(self::OP_ADD, self::TYPE_DENY, $roles, $resources, $privileges, $assert);
}
/**
* Removes "allow" permissions from the ACL
*
* @param Role\RoleInterface|string|array $roles
* @param Resource\ResourceInterface|string|array $resources
* @param string|array $privileges
* @return Acl Provides a fluent interface
*/
public function removeAllow($roles = null, $resources = null, $privileges = null)
{
return $this->setRule(self::OP_REMOVE, self::TYPE_ALLOW, $roles, $resources, $privileges);
}
/**
* Removes "deny" restrictions from the ACL
*
* @param Role\RoleInterface|string|array $roles
* @param Resource\ResourceInterface|string|array $resources
* @param string|array $privileges
* @return Acl Provides a fluent interface
*/
public function removeDeny($roles = null, $resources = null, $privileges = null)
{
return $this->setRule(self::OP_REMOVE, self::TYPE_DENY, $roles, $resources, $privileges);
}
/**
* Performs operations on ACL rules
*
* The $operation parameter may be either OP_ADD or OP_REMOVE, depending on whether the
* user wants to add or remove a rule, respectively:
*
* OP_ADD specifics:
*
* A rule is added that would allow one or more Roles access to [certain $privileges
* upon] the specified Resource(s).
*
* OP_REMOVE specifics:
*
* The rule is removed only in the context of the given Roles, Resources, and privileges.
* Existing rules to which the remove operation does not apply would remain in the
* ACL.
*
* The $type parameter may be either TYPE_ALLOW or TYPE_DENY, depending on whether the
* rule is intended to allow or deny permission, respectively.
*
* The $roles and $resources parameters may be references to, or the string identifiers for,
* existing Resources/Roles, or they may be passed as arrays of these - mixing string identifiers
* and objects is ok - to indicate the Resources and Roles to which the rule applies. If either
* $roles or $resources is null, then the rule applies to all Roles or all Resources, respectively.
* Both may be null in order to work with the default rule of the ACL.
*
* The $privileges parameter may be used to further specify that the rule applies only
* to certain privileges upon the Resource(s) in question. This may be specified to be a single
* privilege with a string, and multiple privileges may be specified as an array of strings.
*
* If $assert is provided, then its assert() method must return true in order for
* the rule to apply. If $assert is provided with $roles, $resources, and $privileges all
* equal to null, then a rule having a type of:
*
* TYPE_ALLOW will imply a type of TYPE_DENY, and
*
* TYPE_DENY will imply a type of TYPE_ALLOW
*
* when the rule's assertion fails. This is because the ACL needs to provide expected
* behavior when an assertion upon the default ACL rule fails.
*
* @param string $operation
* @param string $type
* @param Role\RoleInterface|string|array $roles
* @param Resource\ResourceInterface|string|array $resources
* @param string|array $privileges
* @param Assertion\AssertionInterface $assert
* @throws Exception\InvalidArgumentException
* @return Acl Provides a fluent interface
*/
public function setRule($operation, $type, $roles = null, $resources = null,
$privileges = null, Assertion\AssertionInterface $assert = null
) {
// ensure that the rule type is valid; normalize input to uppercase
$type = strtoupper($type);
if (self::TYPE_ALLOW !== $type && self::TYPE_DENY !== $type) {
throw new Exception\InvalidArgumentException(sprintf(
'Unsupported rule type; must be either "%s" or "%s"',
self::TYPE_ALLOW,
self::TYPE_DENY
));
}
// ensure that all specified Roles exist; normalize input to array of Role objects or null
if (!is_array($roles)) {
$roles = array($roles);
} elseif (0 === count($roles)) {
$roles = array(null);
}
$rolesTemp = $roles;
$roles = array();
foreach ($rolesTemp as $role) {
if (null !== $role) {
$roles[] = $this->getRoleRegistry()->get($role);
} else {
$roles[] = null;
}
}
unset($rolesTemp);
// ensure that all specified Resources exist; normalize input to array of Resource objects or null
if (!is_array($resources)) {
if (null === $resources && count($this->resources) > 0) {
$resources = array_keys($this->resources);
// Passing a null resource; make sure "global" permission is also set!
if (!in_array(null, $resources)) {
array_unshift($resources, null);
}
} else {
$resources = array($resources);
}
} elseif (0 === count($resources)) {
$resources = array(null);
}
$resourcesTemp = $resources;
$resources = array();
foreach ($resourcesTemp as $resource) {
if (null !== $resource) {
$resourceObj = $this->getResource($resource);
$resourceId = $resourceObj->getResourceId();
$children = $this->getChildResources($resourceObj);
$resources = array_merge($resources, $children);
$resources[$resourceId] = $resourceObj;
} else {
$resources[] = null;
}
}
unset($resourcesTemp);
// normalize privileges to array
if (null === $privileges) {
$privileges = array();
} elseif (!is_array($privileges)) {
$privileges = array($privileges);
}
switch ($operation) {
// add to the rules
case self::OP_ADD:
foreach ($resources as $resource) {
foreach ($roles as $role) {
$rules =& $this->getRules($resource, $role, true);
if (0 === count($privileges)) {
$rules['allPrivileges']['type'] = $type;
$rules['allPrivileges']['assert'] = $assert;
if (!isset($rules['byPrivilegeId'])) {
$rules['byPrivilegeId'] = array();
}
} else {
foreach ($privileges as $privilege) {
$rules['byPrivilegeId'][$privilege]['type'] = $type;
$rules['byPrivilegeId'][$privilege]['assert'] = $assert;
}
}
}
}
break;
// remove from the rules
case self::OP_REMOVE:
foreach ($resources as $resource) {
foreach ($roles as $role) {
$rules =& $this->getRules($resource, $role);
if (null === $rules) {
continue;
}
if (0 === count($privileges)) {
if (null === $resource && null === $role) {
if ($type === $rules['allPrivileges']['type']) {
$rules = array(
'allPrivileges' => array(
'type' => self::TYPE_DENY,
'assert' => null
),
'byPrivilegeId' => array()
);
}
continue;
}
if (isset($rules['allPrivileges']['type']) &&
$type === $rules['allPrivileges']['type'])
{
unset($rules['allPrivileges']);
}
} else {
foreach ($privileges as $privilege) {
if (isset($rules['byPrivilegeId'][$privilege]) &&
$type === $rules['byPrivilegeId'][$privilege]['type'])
{
unset($rules['byPrivilegeId'][$privilege]);
}
}
}
}
}
break;
default:
throw new Exception\InvalidArgumentException(sprintf(
'Unsupported operation; must be either "%s" or "%s"',
self::OP_ADD,
self::OP_REMOVE
));
}
return $this;
}
/**
* Returns all child resources from the given resource.
*
* @param Resource\ResourceInterface|string $resource
* @return Resource\ResourceInterface[]
*/
protected function getChildResources(Resource\ResourceInterface $resource)
{
$return = array();
$id = $resource->getResourceId();
$children = $this->resources[$id]['children'];
foreach ($children as $child) {
$child_return = $this->getChildResources($child);
$child_return[$child->getResourceId()] = $child;
$return = array_merge($return, $child_return);
}
return $return;
}
/**
* Returns true if and only if the Role has access to the Resource
*
* The $role and $resource parameters may be references to, or the string identifiers for,
* an existing Resource and Role combination.
*
* If either $role or $resource is null, then the query applies to all Roles or all Resources,
* respectively. Both may be null to query whether the ACL has a "blacklist" rule
* (allow everything to all). By default, Zend\Permissions\Acl creates a "whitelist" rule (deny
* everything to all), and this method would return false unless this default has
* been overridden (i.e., by executing $acl->allow()).
*
* If a $privilege is not provided, then this method returns false if and only if the
* Role is denied access to at least one privilege upon the Resource. In other words, this
* method returns true if and only if the Role is allowed all privileges on the Resource.
*
* This method checks Role inheritance using a depth-first traversal of the Role registry.
* The highest priority parent (i.e., the parent most recently added) is checked first,
* and its respective parents are checked similarly before the lower-priority parents of
* the Role are checked.
*
* @param Role\RoleInterface|string $role
* @param Resource\ResourceInterface|string $resource
* @param string $privilege
* @return bool
*/
public function isAllowed($role = null, $resource = null, $privilege = null)
{
// reset role & resource to null
$this->isAllowedRole = null;
$this->isAllowedResource = null;
$this->isAllowedPrivilege = null;
if (null !== $role) {
// keep track of originally called role
$this->isAllowedRole = $role;
$role = $this->getRoleRegistry()->get($role);
if (!$this->isAllowedRole instanceof Role\RoleInterface) {
$this->isAllowedRole = $role;
}
}
if (null !== $resource) {
// keep track of originally called resource
$this->isAllowedResource = $resource;
$resource = $this->getResource($resource);
if (!$this->isAllowedResource instanceof Resource\ResourceInterface) {
$this->isAllowedResource = $resource;
}
}
if (null === $privilege) {
// query on all privileges
do {
// depth-first search on $role if it is not 'allRoles' pseudo-parent
if (null !== $role && null !== ($result = $this->roleDFSAllPrivileges($role, $resource, $privilege))) {
return $result;
}
// look for rule on 'allRoles' pseudo-parent
if (null !== ($rules = $this->getRules($resource, null))) {
foreach ($rules['byPrivilegeId'] as $privilege => $rule) {
if (self::TYPE_DENY === ($ruleTypeOnePrivilege = $this->getRuleType($resource, null, $privilege))) {
return false;
}
}
if (null !== ($ruleTypeAllPrivileges = $this->getRuleType($resource, null, null))) {
return self::TYPE_ALLOW === $ruleTypeAllPrivileges;
}
}
// try next Resource
$resource = $this->resources[$resource->getResourceId()]['parent'];
} while (true); // loop terminates at 'allResources' pseudo-parent
} else {
$this->isAllowedPrivilege = $privilege;
// query on one privilege
do {
// depth-first search on $role if it is not 'allRoles' pseudo-parent
if (null !== $role && null !== ($result = $this->roleDFSOnePrivilege($role, $resource, $privilege))) {
return $result;
}
// look for rule on 'allRoles' pseudo-parent
if (null !== ($ruleType = $this->getRuleType($resource, null, $privilege))) {
return self::TYPE_ALLOW === $ruleType;
} elseif (null !== ($ruleTypeAllPrivileges = $this->getRuleType($resource, null, null))) {
$result = self::TYPE_ALLOW === $ruleTypeAllPrivileges;
if ($result || null === $resource) {
return $result;
}
}
// try next Resource
$resource = $this->resources[$resource->getResourceId()]['parent'];
} while (true); // loop terminates at 'allResources' pseudo-parent
}
}
/**
* Returns the Role registry for this ACL
*
* If no Role registry has been created yet, a new default Role registry
* is created and returned.
*
* @return Role\Registry
*/
protected function getRoleRegistry()
{
if (null === $this->roleRegistry) {
$this->roleRegistry = new Role\Registry();
}
return $this->roleRegistry;
}
/**
* Performs a depth-first search of the Role DAG, starting at $role, in order to find a rule
* allowing/denying $role access to all privileges upon $resource
*
* This method returns true if a rule is found and allows access. If a rule exists and denies access,
* then this method returns false. If no applicable rule is found, then this method returns null.
*
* @param Role\RoleInterface $role
* @param Resource\ResourceInterface $resource
* @return bool|null
*/
protected function roleDFSAllPrivileges(Role\RoleInterface $role, Resource\ResourceInterface $resource = null)
{
$dfs = array(
'visited' => array(),
'stack' => array()
);
if (null !== ($result = $this->roleDFSVisitAllPrivileges($role, $resource, $dfs))) {
return $result;
}
// This comment is needed due to a strange php-cs-fixer bug
while (null !== ($role = array_pop($dfs['stack']))) {
if (!isset($dfs['visited'][$role->getRoleId()])) {
if (null !== ($result = $this->roleDFSVisitAllPrivileges($role, $resource, $dfs))) {
return $result;
}
}
}
return null;
}
/**
* Visits an $role in order to look for a rule allowing/denying $role access to all privileges upon $resource
*
* This method returns true if a rule is found and allows access. If a rule exists and denies access,
* then this method returns false. If no applicable rule is found, then this method returns null.
*
* This method is used by the internal depth-first search algorithm and may modify the DFS data structure.
*
* @param Role\RoleInterface $role
* @param Resource\ResourceInterface $resource
* @param array $dfs
* @return bool|null
* @throws Exception\RuntimeException
*/
protected function roleDFSVisitAllPrivileges(Role\RoleInterface $role, Resource\ResourceInterface $resource = null, &$dfs = null)
{
if (null === $dfs) {
throw new Exception\RuntimeException('$dfs parameter may not be null');
}
if (null !== ($rules = $this->getRules($resource, $role))) {
foreach ($rules['byPrivilegeId'] as $privilege => $rule) {
if (self::TYPE_DENY === ($ruleTypeOnePrivilege = $this->getRuleType($resource, $role, $privilege))) {
return false;
}
}
if (null !== ($ruleTypeAllPrivileges = $this->getRuleType($resource, $role, null))) {
return self::TYPE_ALLOW === $ruleTypeAllPrivileges;
}
}
$dfs['visited'][$role->getRoleId()] = true;
foreach ($this->getRoleRegistry()->getParents($role) as $roleParent) {
$dfs['stack'][] = $roleParent;
}
return null;
}
/**
* Performs a depth-first search of the Role DAG, starting at $role, in order to find a rule
* allowing/denying $role access to a $privilege upon $resource
*
* This method returns true if a rule is found and allows access. If a rule exists and denies access,
* then this method returns false. If no applicable rule is found, then this method returns null.
*
* @param Role\RoleInterface $role
* @param Resource\ResourceInterface $resource
* @param string $privilege
* @return bool|null
* @throws Exception\RuntimeException
*/
protected function roleDFSOnePrivilege(Role\RoleInterface $role, Resource\ResourceInterface $resource = null, $privilege = null)
{
if (null === $privilege) {
throw new Exception\RuntimeException('$privilege parameter may not be null');
}
$dfs = array(
'visited' => array(),
'stack' => array()
);
if (null !== ($result = $this->roleDFSVisitOnePrivilege($role, $resource, $privilege, $dfs))) {
return $result;
}
// This comment is needed due to a strange php-cs-fixer bug
while (null !== ($role = array_pop($dfs['stack']))) {
if (!isset($dfs['visited'][$role->getRoleId()])) {
if (null !== ($result = $this->roleDFSVisitOnePrivilege($role, $resource, $privilege, $dfs))) {
return $result;
}
}
}
return null;
}
/**
* Visits an $role in order to look for a rule allowing/denying $role access to a $privilege upon $resource
*
* This method returns true if a rule is found and allows access. If a rule exists and denies access,
* then this method returns false. If no applicable rule is found, then this method returns null.
*
* This method is used by the internal depth-first search algorithm and may modify the DFS data structure.
*
* @param Role\RoleInterface $role
* @param Resource\ResourceInterface $resource
* @param string $privilege
* @param array $dfs
* @return bool|null
* @throws Exception\RuntimeException
*/
protected function roleDFSVisitOnePrivilege(Role\RoleInterface $role, Resource\ResourceInterface $resource = null,
$privilege = null, &$dfs = null
) {
if (null === $privilege) {
/**
* @see Zend\Permissions\Acl\Exception
*/
throw new Exception\RuntimeException('$privilege parameter may not be null');
}
if (null === $dfs) {
/**
* @see Zend\Permissions\Acl\Exception
*/
throw new Exception\RuntimeException('$dfs parameter may not be null');
}
if (null !== ($ruleTypeOnePrivilege = $this->getRuleType($resource, $role, $privilege))) {
return self::TYPE_ALLOW === $ruleTypeOnePrivilege;
} elseif (null !== ($ruleTypeAllPrivileges = $this->getRuleType($resource, $role, null))) {
return self::TYPE_ALLOW === $ruleTypeAllPrivileges;
}
$dfs['visited'][$role->getRoleId()] = true;
foreach ($this->getRoleRegistry()->getParents($role) as $roleParent) {
$dfs['stack'][] = $roleParent;
}
return null;
}
/**
* Returns the rule type associated with the specified Resource, Role, and privilege
* combination.
*
* If a rule does not exist or its attached assertion fails, which means that
* the rule is not applicable, then this method returns null. Otherwise, the
* rule type applies and is returned as either TYPE_ALLOW or TYPE_DENY.
*
* If $resource or $role is null, then this means that the rule must apply to
* all Resources or Roles, respectively.
*
* If $privilege is null, then the rule must apply to all privileges.
*
* If all three parameters are null, then the default ACL rule type is returned,
* based on whether its assertion method passes.
*
* @param null|Resource\ResourceInterface $resource
* @param null|Role\RoleInterface $role
* @param null|string $privilege
* @return string|null
*/
protected function getRuleType(Resource\ResourceInterface $resource = null, Role\RoleInterface $role = null, $privilege = null)
{
// get the rules for the $resource and $role
if (null === ($rules = $this->getRules($resource, $role))) {
return null;
}
// follow $privilege
if (null === $privilege) {
if (isset($rules['allPrivileges'])) {
$rule = $rules['allPrivileges'];
} else {
return null;
}
} elseif (!isset($rules['byPrivilegeId'][$privilege])) {
return null;
} else {
$rule = $rules['byPrivilegeId'][$privilege];
}
// check assertion first
if ($rule['assert']) {
$assertion = $rule['assert'];
$assertionValue = $assertion->assert(
$this,
($this->isAllowedRole instanceof Role\RoleInterface) ? $this->isAllowedRole : $role,
($this->isAllowedResource instanceof Resource\ResourceInterface) ? $this->isAllowedResource : $resource,
$this->isAllowedPrivilege
);
}
if (null === $rule['assert'] || $assertionValue) {
return $rule['type'];
} elseif (null !== $resource || null !== $role || null !== $privilege) {
return null;
} elseif (self::TYPE_ALLOW === $rule['type']) {
return self::TYPE_DENY;
}
return self::TYPE_ALLOW;
}
/**
* Returns the rules associated with a Resource and a Role, or null if no such rules exist
*
* If either $resource or $role is null, this means that the rules returned are for all Resources or all Roles,
* respectively. Both can be null to return the default rule set for all Resources and all Roles.
*
* If the $create parameter is true, then a rule set is first created and then returned to the caller.
*
* @param Resource\ResourceInterface $resource
* @param Role\RoleInterface $role
* @param bool $create
* @return array|null
*/
protected function &getRules(Resource\ResourceInterface $resource = null, Role\RoleInterface $role = null, $create = false)
{
// create a reference to null
$null = null;
$nullRef =& $null;
// follow $resource
do {
if (null === $resource) {
$visitor =& $this->rules['allResources'];
break;
}
$resourceId = $resource->getResourceId();
if (!isset($this->rules['byResourceId'][$resourceId])) {
if (!$create) {
return $nullRef;
}
$this->rules['byResourceId'][$resourceId] = array();
}
$visitor =& $this->rules['byResourceId'][$resourceId];
} while (false);
// follow $role
if (null === $role) {
if (!isset($visitor['allRoles'])) {
if (!$create) {
return $nullRef;
}
$visitor['allRoles']['byPrivilegeId'] = array();
}
return $visitor['allRoles'];
}
$roleId = $role->getRoleId();
if (!isset($visitor['byRoleId'][$roleId])) {
if (!$create) {
return $nullRef;
}
$visitor['byRoleId'][$roleId]['byPrivilegeId'] = array();
}
return $visitor['byRoleId'][$roleId];
}
/**
* @return array of registered roles
*/
public function getRoles()
{
return array_keys($this->getRoleRegistry()->getRoles());
}
/**
* @return array of registered resources
*/
public function getResources()
{
return array_keys($this->resources);
}
}
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