如何在SabreDAV PHP服务器中为CalDAV实现自定义ACL

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@H_618_0@到目前为止,我还无法在SabreDAV中成功实现ACL(权限).

@H_618_0@我已经使用自己的Auth,Principal和CalDAV后端在Code Igniter中实现了SabreDAV.这是来自控制器的实际代码：

@H_618_0@

<?PHP if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class CalDAV extends CI_Controller {

    public function _remap() {
        $this->load->library('SabreDAV');

        $authBACkend = new SabreDAV_DAV_Auth_BACkend_Tank_Auth;
        $principalBACkend = new Sabre_DAVACL_PrincipalBACkend_Click4Time;
        $calendarBACkend = new Sabre_CalDAv_backend_Click4Time;

        // Directory tree
        $tree = array(
            new Sabre_DAVACL_PrincipalCollection($principalBACkend),
            new Sabre_CalDAV_CalendarRootNode($principalBACkend, $calendarBACkend)
        );      

        // The object tree needs in turn to be passed to the server class
        $server = new Sabre_DAV_Server($treE);

        // You are highly encouraged to set your WebDAV server base url. Without it,
        // SabreDAV will guess, but the guess is not always correct. PutTing the
        // server on the root of the domain will improve compatibility. 
        $server->setBaseUri('/caldav/');

        // Authentication plugin
        $authPlugin = new Sabre_DAV_Auth_Plugin($authBACkend, 'SabreDAV');
        $server->addPlugin($authPlugin);

        // CalDAV plugin
        $caldavPlugin = new Sabre_CalDAV_Plugin();
        $server->addPlugin($caldavPlugin);

        // ACL plugin
        $aclPlugin = new Sabre_DAVACL_Custom;
        $server->addPlugin($aclPlugin);

        // Support for html frontend
        $browser = new Sabre_DAv_browser_Plugin();
        $server->addPlugin($browser);

        $server->exec();
    }
}

@H_618_0@我当前实现权限的尝试是通过自定义ACL插件进行的：

@H_618_0@

<?PHP

class Sabre_DAVACL_Custom extends Sabre_DAVACL_Plugin {

    public $allowAccessToNodesWithoutACL = false;

    private function _getCurrentUserName() {
        $authPlugin = $this->server->getPlugin('auth');
        if (is_null($authPlugin)) return null;

        return $authPlugin->getCurrentUser();
    }

    public function getACL($nodE) {
        $user = $this->_getCurrentUserName();
        $path = $node->getName();

        if ($path == 'calendars' || $path == 'principals' || $path == 'root') {
            return array(
                array(
                    'privilege' => '{DAV:}read',
                    'principal' => 'principals/' . $user,
                    'protected' => true,
                )
            );
        }
        else if ($path == 'calendars/' . $user) {
            return array(
                array(
                    'privilege' => '{DAV:}read',
                    'principal' => 'principals/' . $user,
                    'protected' => true,
                )
            );
        }

        return array();
    }
}

@H_618_0@该代码几乎可以工作,除了第二次检查应该授权用户查看他或她自己的日历.我无法获得$node的完整路径名.

@H_618_0@这可能是错误的实现方式,但是我无法找到任何文档来确认这是实现ACL的方式.

解决方法:

@H_618_0@我使用了不同的尝试,就像您一样扩展了插件,但是随后我替换了getSupportedPrivilegeSet($nodE).

@H_618_0@在sabredav 1.8.6中,它看起来像这样：

@H_618_0@

public function getSupportedPrivilegeSet($nodE) {

    if (is_String($nodE)) {
        $node = $this->server->tree->getNodeForPath($nodE);
    }

    if ($node instanceof IACL) {
        $result = $node->getSupportedPrivilegeSet();

        if ($result)
            return $result;
    }

    return self::getDefaultSupportedPrivilegeSet();

}

@H_618_0@现在您可以使用类而不是我发现更有用的路径,即：

@H_618_0@

class DavCalAcl extends \Sabre\DAVACL\Plugin {

public function getSupportedPrivilegeSet($nodE) {       
    if (is_String($nodE)) {
        $node = $this->server->tree->getNodeForPath($nodE);
    }

    if($node instanceof \Sabre\CalDAV\Calendar || $node instanceof \Sabre\CalDAV\CalendarObject) {
        return array(
            array(
                'privilege'  => '{DAV:}read',
                'aggregates' => array(
                    array(
                        'privilege' => '{DAV:}read-acl',
                        'abstract'  => true,
                    ),
                    array(
                        'privilege' => '{DAV:}read-current-user-privilege-set',
                        'abstract'  => true,
                    ),
                ),
            )
        );
    }

    if ($node instanceof \Sabre\DAVACL\IACL) {
        $result = $node->getSupportedPrivilegeSet();
        if ($result)
            return $result;
    }

    return self::getDefaultSupportedPrivilegeSet();
}

}

@H_618_0@这是我当前的尝试,目的是让iCal将日历识别为只读…我还没有到那儿,但这也许可以帮助您更好地识别对象

@H_618_0@如果您想要一个节点的绝对路径,我想您总是可以在根目录下搜索当前节点,并记录下将您带到那里的路径.据我检查sabredav中的节点不支持父级或根级属性.

@H_618_0@[更新]

@H_618_0@最好的方法似乎是在插件中覆盖getACl.在这里,您可以测试节点的类并返回您真正想要的东西,而不是默认对象返回的东西(例如,查看UserCalendars-> getACL().

@H_618_0@这是我基于对象类型的只读强制实施方案：

@H_618_0@

class DavCalAcl extends \Sabre\DAVACL\Plugin {

    /**
     * Returns the full ACL list.
     *
     * Either a uri or a DAV\INode may be passed.
     *
     * null will be returned if the node doesn't support ACLs.
     *
     * @param String|DAV\INode $node
     * @return array
     */
    public function getACL($nodE) {

        if (is_String($nodE)) {
            $node = $this->server->tree->getNodeForPath($nodE);
        }
        if (!$node instanceof \Sabre\DAVACL\IACL) {
            return null;
        }

        if( $node instanceof \Sabre\CalDAV\Calendar ||
            $node instanceof \Sabre\CalDAV\CalendarObject ||
            $node instanceof \Sabre\CalDAV\UserCalendars
        ) {
            $acl = array(
                array(
                    'privilege' => '{DAV:}read',
                    'principal' => $node->getowner(),
                    'protected' => true,
                ),
            );
        } else {
            $acl = $node->getACL();         
        }

        foreach($this->adminPrincipals as $adminPrincipal) {
            $acl[] = array(
                'principal' => $adminPrincipal,
                'privilege' => '{DAV:}all',
                'protected' => true,
            );
        }
        return $acl;

    }
}

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