class.ilWebDAVAuthentication.php

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<?php
 
class ilWebDAVAuthentication
{
    protected $session_aware_webdav_clients = [
        "Microsoft-WebDAV-MiniRedir",
        "gvfs"
    ];
 
    public function isUserAgentSessionAware(string $user_agent) : bool
    {
        foreach ($this->session_aware_webdav_clients as $webdav_client_name) {
            if (stristr($user_agent, $webdav_client_name)) {
                return true;
            }
        }
        return false;
    }
 
    protected function getUserAgent() : string
    {
        // is user agent set?
        $user_agent = isset($_SERVER["HTTP_USER_AGENT"]) ? $_SERVER["HTTP_USER_AGENT"] : "";
 
        // is value of user agent a string?
        $user_agent = is_string($user_agent) ? $user_agent : "";
 
        return $user_agent;
    }
 
    public function authenticate($a_username, $a_password)
    {
        global $DIC;
 
        if ($this->isUserAgentSessionAware($this->getUserAgent())) {
            if ($DIC['ilAuthSession']->isAuthenticated() && $DIC->user()->getId() != 0) {
                ilLoggerFactory::getLogger('webdav')->debug('User authenticated through session. UserID = ' . $DIC->user()->getId());
                return true;
            }
        } else {
            ilSession::enableWebAccessWithoutSession(true);
        }
       
        $credentials = new ilAuthFrontendCredentialsHTTP();
        $credentials->setUsername($a_username);
        $credentials->setPassword($a_password);
        
        $provider_factory = new ilAuthProviderFactory();
        $providers = $provider_factory->getProviders($credentials);
        
        $status = ilAuthStatus::getInstance();
        
        $frontend_factory = new ilAuthFrontendFactory();
        $frontend_factory->setContext(ilAuthFrontendFactory::CONTEXT_HTTP);
        $frontend = $frontend_factory->getFrontend(
            $DIC['ilAuthSession'],
            $status,
            $credentials,
            $providers
            );
 
        $frontend->authenticate();
        
        switch ($status->getStatus()) {
            case ilAuthStatus::STATUS_AUTHENTICATED:
                ilLoggerFactory::getLogger('webdav')->debug('User authenticated through basic authentication. UserId = ' . $DIC->user()->getId());
                return true;
                
            case ilAuthStatus::STATUS_ACCOUNT_MIGRATION_REQUIRED:
                ilLoggerFactory::getLogger('webdav')->info('Basic authentication failed; Account migration required.');
                return false;
                
            case ilAuthStatus::STATUS_AUTHENTICATION_FAILED:
                ilLoggerFactory::getLogger('webdav')->info('Basic authentication failed; Wrong login, password.');
                return false;
        }
        
        return false;
    }
}