客户端单点实现

（需求是存在验证，不存在插入）

一、首先找到客户端登录的位置，如下：

owncloud\lib\private\connector\sabre\auth.php中的53行，validateUserPass方法，修改为

protected function validateUserPass($username, $password) {
   if (OC_User::isLoggedIn() &&
      $this->isDavAuthenticated(OC_User::getUser())
   ) {
      OC_Util::setupFS(OC_User::getUser());
      \OC::$server->getSession()->close();
      return true;
   } else {
      OC_Util::setUpFS(); //login hooks may need early access to the filesystem
      //$displayname=$username;
      //查询用户id
      $query = OC_DB::prepare('SELECT `uid` FROM `*PREFIX*users` WHERE LOWER(`displayname`) = LOWER(?)');
      $result = $query->execute(array($username));
      $row = $result->fetchRow();

//如果存在用户，则请求远端的restful借口验证
      if($row){
         $uid=$row['uid'];
         $curl = curl_init();
         curl_setopt($curl, CURLOPT_URL, 'http://******/uic/rest/v1/users/check/account_passwd?account='.$uid.'&password='.$password);
         curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
         $re = curl_exec($curl);
         curl_close($curl);
         $arr=json_decode($re,true);
         //var_dump($arr->result);die;
         //file_put_contents("d:/2.txt",$arr['result'].OC_User::login($uid));
         if($arr['result']&&    OC_User::login($uid)) {
            // make sure we use owncloud's internal username here
            // and not the HTTP auth supplied one, see issue #14048
            $ocUser = OC_User::getUser();
            OC_Util::setUpFS($ocUser);
            \OC::$server->getSession()->set(self::DAV_AUTHENTICATED, $ocUser);
            \OC::$server->getSession()->close();
            return true;
         } else {
            \OC::$server->getSession()->close();
            return false;
         }
      }else{

//如果没有登录走到这里去到本地登录，在之后进行用户插入
         if(    OC_User::login($username,$password)) {
            // make sure we use owncloud's internal username here
            // and not the HTTP auth supplied one, see issue #14048
            $ocUser = OC_User::getUser();
            OC_Util::setUpFS($ocUser);
            \OC::$server->getSession()->set(self::DAV_AUTHENTICATED, $ocUser);
            \OC::$server->getSession()->close();
            return true;
         } else {
            \OC::$server->getSession()->close();
            return false;
         }
         return false;
      }
      //file_put_contents("d:/1.txt",$row.$uid.'http://******/uic/rest/v1/users/check/account_passwd?account='.$uid.'&password='.$password);
   }
}

二、修改本地数据库验证方法：

owncloud\lib\private\user\database.php中的158行，checkPassword方法，修改为：

public function checkPassword($uid, $password) {

//查询数据库是否有当前用户
   $query = OC_DB::prepare('SELECT `uid`, `password` FROM `*PREFIX*users` WHERE LOWER(`displayname`) = LOWER(?)');
   $result = $query->execute(array($uid));

   $row = $result->fetchRow();
   if ($row) {

//存在则返回uid
      /*$storedHash = $row['password'];
      $newHash = '';
      if(\OC::$server->getHasher()->verify($password, $storedHash, $newHash)) {
         if(!empty($newHash)) {
            $this->setPassword($uid, $password);
         }*/
         return $row['uid'];
      //}

   }else{

//不存在这个用户则开始插入用户过程

//如果存在本地web验证的CAS信息，则说明是web请求
      if($_SESSION['phpCAS']) {
         $uid = $_SESSION['phpCAS']['attributes']['loginid'];
         $displayname = $_SESSION['phpCAS']['attributes']['nickname'];
         if ($displayname == "") {
            $displayname = $_SESSION['phpCAS']['attributes']['email'];
            if ($displayname == "") {
               $displayname = $_SESSION['phpCAS']['attributes']['cellphone'];
            }
         }
         $query = OC_DB::prepare('INSERT INTO `*PREFIX*users` VALUES(?,?,?)');
         $result = $query->execute(array($uid, $displayname, ''));
         if ($result) {
            return $uid;
         }
      }else{

//如果不存在本地session的CAS认证信息，则说明是客户端请求
         $curl = curl_init();
         curl_setopt($curl, CURLOPT_URL, 'http://*******/uic/rest/v1/users/check/account_passwd_return_loginid?account='.$uid.'&password='.$password);
         curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
         $re = curl_exec($curl);
         curl_close($curl);
         $arr=json_decode($re,true);
         $query = OC_DB::prepare('INSERT INTO `*PREFIX*users` VALUES(?,?,?)');
         //file_put_contents("d:/1.txt",$uid.$password.$arr);
         $result = $query->execute(array($arr['loginid'], $uid, ''));
         if ($result) {
            return $uid;
         }
         return false;
      }
   }

   return false;
}

以上。