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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Auth
  * @subpackage Adapter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @see Zend_Auth_Adapter_Interface
  */
 // require_once 'Zend/Auth/Adapter/Interface.php';
 
 /**
  * @see Zend_Db_Adapter_Abstract
  */
 // require_once 'Zend/Db/Adapter/Abstract.php';
 
 /**
  * @see Zend_Auth_Result
  */
 // require_once 'Zend/Auth/Result.php';
 
 
 /**
  * @category   Zend
  * @package    Zend_Auth
  * @subpackage Adapter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Auth_Adapter_DbTable implements Zend_Auth_Adapter_Interface
 {
 
     /**
      * Database Connection
      *
      * @var Zend_Db_Adapter_Abstract
      */
     protected $_zendDb = null;
 
     /**
      * @var Zend_Db_Select
      */
     protected $_dbSelect = null;
 
     /**
      * $_tableName - the table name to check
      *
      * @var string
      */
     protected $_tableName = null;
 
     /**
      * $_identityColumn - the column to use as the identity
      *
      * @var string
      */
     protected $_identityColumn = null;
 
     /**
      * $_credentialColumns - columns to be used as the credentials
      *
      * @var string
      */
     protected $_credentialColumn = null;
 
     /**
      * $_identity - Identity value
      *
      * @var string
      */
     protected $_identity = null;
 
     /**
      * $_credential - Credential values
      *
      * @var string
      */
     protected $_credential = null;
 
     /**
      * $_credentialTreatment - Treatment applied to the credential, such as MD5() or PASSWORD()
      *
      * @var string
      */
     protected $_credentialTreatment = null;
 
     /**
      * $_authenticateResultInfo
      *
      * @var array
      */
     protected $_authenticateResultInfo = null;
 
     /**
      * $_resultRow - Results of database authentication query
      *
      * @var array
      */
     protected $_resultRow = null;
 
     /**
      * $_ambiguityIdentity - Flag to indicate same Identity can be used with
      * different credentials. Default is FALSE and need to be set to true to
      * allow ambiguity usage.
      *
      * @var boolean
      */
     protected $_ambiguityIdentity = false;
 
     /**
      * __construct() - Sets configuration options
      *
      * @param  Zend_Db_Adapter_Abstract $zendDb If null, default database adapter assumed
      * @param  string                   $tableName
      * @param  string                   $identityColumn
      * @param  string                   $credentialColumn
      * @param  string                   $credentialTreatment
      */
     public function __construct(Zend_Db_Adapter_Abstract $zendDb = null, $tableName = null, $identityColumn = null,
                                 $credentialColumn = null, $credentialTreatment = null)
     {
         $this->_setDbAdapter($zendDb);
 
         if (null !== $tableName) {
             $this->setTableName($tableName);
         }
 
         if (null !== $identityColumn) {
             $this->setIdentityColumn($identityColumn);
         }
 
         if (null !== $credentialColumn) {
             $this->setCredentialColumn($credentialColumn);
         }
 
         if (null !== $credentialTreatment) {
             $this->setCredentialTreatment($credentialTreatment);
         }
     }
 
     /**
      * _setDbAdapter() - set the database adapter to be used for quering
      *
      * @param Zend_Db_Adapter_Abstract
      * @throws Zend_Auth_Adapter_Exception
      * @return Zend_Auth_Adapter_DbTable
      */
     protected function _setDbAdapter(Zend_Db_Adapter_Abstract $zendDb = null)
     {
         $this->_zendDb = $zendDb;
 
         /**
          * If no adapter is specified, fetch default database adapter.
          */
         if(null === $this->_zendDb) {
             // require_once 'Zend/Db/Table/Abstract.php';
             $this->_zendDb = Zend_Db_Table_Abstract::getDefaultAdapter();
             if (null === $this->_zendDb) {
                 // require_once 'Zend/Auth/Adapter/Exception.php';
                 throw new Zend_Auth_Adapter_Exception('No database adapter present');
             }
         }
 
         return $this;
     }
 
     /**
      * setTableName() - set the table name to be used in the select query
      *
      * @param  string $tableName
      * @return Zend_Auth_Adapter_DbTable Provides a fluent interface
      */
     public function setTableName($tableName)
     {
         $this->_tableName = $tableName;
         return $this;
     }
 
     /**
      * setIdentityColumn() - set the column name to be used as the identity column
      *
      * @param  string $identityColumn
      * @return Zend_Auth_Adapter_DbTable Provides a fluent interface
      */
     public function setIdentityColumn($identityColumn)
     {
         $this->_identityColumn = $identityColumn;
         return $this;
     }
 
     /**
      * setCredentialColumn() - set the column name to be used as the credential column
      *
      * @param  string $credentialColumn
      * @return Zend_Auth_Adapter_DbTable Provides a fluent interface
      */
     public function setCredentialColumn($credentialColumn)
     {
         $this->_credentialColumn = $credentialColumn;
         return $this;
     }
 
     /**
      * setCredentialTreatment() - allows the developer to pass a parameterized string that is
      * used to transform or treat the input credential data.
      *
      * In many cases, passwords and other sensitive data are encrypted, hashed, encoded,
      * obscured, or otherwise treated through some function or algorithm. By specifying a
      * parameterized treatment string with this method, a developer may apply arbitrary SQL
      * upon input credential data.
      *
      * Examples:
      *
      *  'PASSWORD(?)'
      *  'MD5(?)'
      *
      * @param  string $treatment
      * @return Zend_Auth_Adapter_DbTable Provides a fluent interface
      */
     public function setCredentialTreatment($treatment)
     {
         $this->_credentialTreatment = $treatment;
         return $this;
     }
 
     /**
      * setIdentity() - set the value to be used as the identity
      *
      * @param  string $value
      * @return Zend_Auth_Adapter_DbTable Provides a fluent interface
      */
     public function setIdentity($value)
     {
         $this->_identity = $value;
         return $this;
     }
 
     /**
      * setCredential() - set the credential value to be used, optionally can specify a treatment
      * to be used, should be supplied in parameterized form, such as 'MD5(?)' or 'PASSWORD(?)'
      *
      * @param  string $credential
      * @return Zend_Auth_Adapter_DbTable Provides a fluent interface
      */
     public function setCredential($credential)
     {
         $this->_credential = $credential;
         return $this;
     }
 
     /**
      * setAmbiguityIdentity() - sets a flag for usage of identical identities
      * with unique credentials. It accepts integers (0, 1) or boolean (true,
      * false) parameters. Default is false.
      *
      * @param  int|bool $flag
      * @return Zend_Auth_Adapter_DbTable
      */
     public function setAmbiguityIdentity($flag)
     {
         if (is_integer($flag)) {
             $this->_ambiguityIdentity = (1 === $flag ? true : false);
         } elseif (is_bool($flag)) {
             $this->_ambiguityIdentity = $flag;
         }
         return $this;
     }
     /**
      * getAmbiguityIdentity() - returns TRUE for usage of multiple identical
      * identies with different credentials, FALSE if not used.
      *
      * @return bool
      */
     public function getAmbiguityIdentity()
     {
         return $this->_ambiguityIdentity;
     }
 
     /**
      * getDbSelect() - Return the preauthentication Db Select object for userland select query modification
      *
      * @return Zend_Db_Select
      */
     public function getDbSelect()
     {
         if ($this->_dbSelect == null) {
             $this->_dbSelect = $this->_zendDb->select();
         }
 
         return $this->_dbSelect;
     }
 
     /**
      * getResultRowObject() - Returns the result row as a stdClass object
      *
      * @param  string|array $returnColumns
      * @param  string|array $omitColumns
      * @return stdClass|boolean
      */
     public function getResultRowObject($returnColumns = null, $omitColumns = null)
     {
         if (!$this->_resultRow) {
             return false;
         }
 
         $returnObject = new stdClass();
 
         if (null !== $returnColumns) {
 
             $availableColumns = array_keys($this->_resultRow);
             foreach ( (array) $returnColumns as $returnColumn) {
                 if (in_array($returnColumn, $availableColumns)) {
                     $returnObject->{$returnColumn} = $this->_resultRow[$returnColumn];
                 }
             }
             return $returnObject;
 
         } elseif (null !== $omitColumns) {
 
             $omitColumns = (array) $omitColumns;
             foreach ($this->_resultRow as $resultColumn => $resultValue) {
                 if (!in_array($resultColumn, $omitColumns)) {
                     $returnObject->{$resultColumn} = $resultValue;
                 }
             }
             return $returnObject;
 
         } else {
 
             foreach ($this->_resultRow as $resultColumn => $resultValue) {
                 $returnObject->{$resultColumn} = $resultValue;
             }
             return $returnObject;
 
         }
     }
 
     /**
      * authenticate() - defined by Zend_Auth_Adapter_Interface.  This method is called to
      * attempt an authentication.  Previous to this call, this adapter would have already
      * been configured with all necessary information to successfully connect to a database
      * table and attempt to find a record matching the provided identity.
      *
      * @throws Zend_Auth_Adapter_Exception if answering the authentication query is impossible
      * @return Zend_Auth_Result
      */
     public function authenticate()
     {
         $this->_authenticateSetup();
         $dbSelect = $this->_authenticateCreateSelect();
         $resultIdentities = $this->_authenticateQuerySelect($dbSelect);
 
         if ( ($authResult = $this->_authenticateValidateResultSet($resultIdentities)) instanceof Zend_Auth_Result) {
             return $authResult;
         }
 
         if (true === $this->getAmbiguityIdentity()) {
             $validIdentities = array ();
             $zendAuthCredentialMatchColumn = $this->_zendDb->foldCase('zend_auth_credential_match');
             foreach ($resultIdentities as $identity) {
                 if (1 === (int) $identity[$zendAuthCredentialMatchColumn]) {
                     $validIdentities[] = $identity;
                 }
             }
             $resultIdentities = $validIdentities;
         }
 
         $authResult = $this->_authenticateValidateResult(array_shift($resultIdentities));
         return $authResult;
     }
 
     /**
      * _authenticateSetup() - This method abstracts the steps involved with
      * making sure that this adapter was indeed setup properly with all
      * required pieces of information.
      *
      * @throws Zend_Auth_Adapter_Exception - in the event that setup was not done properly
      * @return true
      */
     protected function _authenticateSetup()
     {
         $exception = null;
 
         if ($this->_tableName == '') {
             $exception = 'A table must be supplied for the Zend_Auth_Adapter_DbTable authentication adapter.';
         } elseif ($this->_identityColumn == '') {
             $exception = 'An identity column must be supplied for the Zend_Auth_Adapter_DbTable authentication adapter.';
         } elseif ($this->_credentialColumn == '') {
             $exception = 'A credential column must be supplied for the Zend_Auth_Adapter_DbTable authentication adapter.';
         } elseif ($this->_identity == '') {
             $exception = 'A value for the identity was not provided prior to authentication with Zend_Auth_Adapter_DbTable.';
         } elseif ($this->_credential === null) {
             $exception = 'A credential value was not provided prior to authentication with Zend_Auth_Adapter_DbTable.';
         }
 
         if (null !== $exception) {
             /**
              * @see Zend_Auth_Adapter_Exception
              */
             // require_once 'Zend/Auth/Adapter/Exception.php';
             throw new Zend_Auth_Adapter_Exception($exception);
         }
 
         $this->_authenticateResultInfo = array(
             'code'     => Zend_Auth_Result::FAILURE,
             'identity' => $this->_identity,
             'messages' => array()
             );
 
         return true;
     }
 
     /**
      * _authenticateCreateSelect() - This method creates a Zend_Db_Select object that
      * is completely configured to be queried against the database.
      *
      * @return Zend_Db_Select
      */
     protected function _authenticateCreateSelect()
     {
         // build credential expression
         if (empty($this->_credentialTreatment) || (strpos($this->_credentialTreatment, '?') === false)) {
             $this->_credentialTreatment = '?';
         }
 
         $credentialExpression = new Zend_Db_Expr(
             '(CASE WHEN ' .
             $this->_zendDb->quoteInto(
                 $this->_zendDb->quoteIdentifier($this->_credentialColumn, true)
                 . ' = ' . $this->_credentialTreatment, $this->_credential
                 )
             . ' THEN 1 ELSE 0 END) AS '
             . $this->_zendDb->quoteIdentifier(
                 $this->_zendDb->foldCase('zend_auth_credential_match')
                 )
             );
 
         // get select
         $dbSelect = clone $this->getDbSelect();
         $dbSelect->from($this->_tableName, array('*', $credentialExpression))
                  ->where($this->_zendDb->quoteIdentifier($this->_identityColumn, true) . ' = ?', $this->_identity);
 
         return $dbSelect;
     }
 
     /**
      * _authenticateQuerySelect() - This method accepts a Zend_Db_Select object and
      * performs a query against the database with that object.
      *
      * @param Zend_Db_Select $dbSelect
      * @throws Zend_Auth_Adapter_Exception - when an invalid select
      *                                       object is encountered
      * @return array
      */
     protected function _authenticateQuerySelect(Zend_Db_Select $dbSelect)
     {
         try {
             if ($this->_zendDb->getFetchMode() != Zend_DB::FETCH_ASSOC) {
                 $origDbFetchMode = $this->_zendDb->getFetchMode();
                 $this->_zendDb->setFetchMode(Zend_DB::FETCH_ASSOC);
             }
             $resultIdentities = $this->_zendDb->fetchAll($dbSelect);
             if (isset($origDbFetchMode)) {
                 $this->_zendDb->setFetchMode($origDbFetchMode);
                 unset($origDbFetchMode);
             }
         } catch (Exception $e) {
             /**
              * @see Zend_Auth_Adapter_Exception
              */
             // require_once 'Zend/Auth/Adapter/Exception.php';
             throw new Zend_Auth_Adapter_Exception('The supplied parameters to Zend_Auth_Adapter_DbTable failed to '
                                                 . 'produce a valid sql statement, please check table and column names '
                                                 . 'for validity.', 0, $e);
         }
         return $resultIdentities;
     }
 
     /**
      * _authenticateValidateResultSet() - This method attempts to make
      * certain that only one record was returned in the resultset
      *
      * @param array $resultIdentities
      * @return true|Zend_Auth_Result
      */
     protected function _authenticateValidateResultSet(array $resultIdentities)
     {
 
         if (count($resultIdentities) < 1) {
             $this->_authenticateResultInfo['code'] = Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND;
             $this->_authenticateResultInfo['messages'][] = 'A record with the supplied identity could not be found.';
             return $this->_authenticateCreateAuthResult();
         } elseif (count($resultIdentities) > 1 && false === $this->getAmbiguityIdentity()) {
             $this->_authenticateResultInfo['code'] = Zend_Auth_Result::FAILURE_IDENTITY_AMBIGUOUS;
             $this->_authenticateResultInfo['messages'][] = 'More than one record matches the supplied identity.';
             return $this->_authenticateCreateAuthResult();
         }
 
         return true;
     }
 
     /**
      * _authenticateValidateResult() - This method attempts to validate that
      * the record in the resultset is indeed a record that matched the
      * identity provided to this adapter.
      *
      * @param array $resultIdentity
      * @return Zend_Auth_Result
      */
     protected function _authenticateValidateResult($resultIdentity)
     {
         $zendAuthCredentialMatchColumn = $this->_zendDb->foldCase('zend_auth_credential_match');
 
         if ($resultIdentity[$zendAuthCredentialMatchColumn] != '1') {
             $this->_authenticateResultInfo['code'] = Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID;
             $this->_authenticateResultInfo['messages'][] = 'Supplied credential is invalid.';
             return $this->_authenticateCreateAuthResult();
         }
 
         unset($resultIdentity[$zendAuthCredentialMatchColumn]);
         $this->_resultRow = $resultIdentity;
 
         $this->_authenticateResultInfo['code'] = Zend_Auth_Result::SUCCESS;
         $this->_authenticateResultInfo['messages'][] = 'Authentication successful.';
         return $this->_authenticateCreateAuthResult();
     }
 
     /**
      * _authenticateCreateAuthResult() - Creates a Zend_Auth_Result object from
      * the information that has been collected during the authenticate() attempt.
      *
      * @return Zend_Auth_Result
      */
     protected function _authenticateCreateAuthResult()
     {
         return new Zend_Auth_Result(
             $this->_authenticateResultInfo['code'],
             $this->_authenticateResultInfo['identity'],
             $this->_authenticateResultInfo['messages']
             );
     }
 
 }