abstract.php

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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 [e-mail] so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Controller
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/**
 * Zend_Controller_Response_Abstract
 *
 * Base class for Zend_Controller responses
 *
 * @package Zend_Controller
 * @subpackage Response
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
abstract class Zend_Controller_Response_Abstract
{
    /**
     * Body content
     * @var array
     */
    protected $_body = array();

    /**
     * Exception stack
     * @var Exception
     */
    protected $_exceptions = array();

    /**
     * Array of headers. Each header is an array with keys 'name' and 'value'
     * @var array
     */
    protected $_headers = array();

    /**
     * Array of raw headers. Each header is a single string, the entire header to emit
     * @var array
     */
    protected $_headersRaw = array();

    /**
     * HTTP response code to use in headers
     * @var int
     */
    protected $_httpResponseCode = 200;

    /**
     * Flag; is this response a redirect?
     * @var boolean
     */
    protected $_isRedirect = false;

    /**
     * Whether or not to render exceptions; off by default
     * @var boolean
     */
    protected $_renderExceptions = false;

    /**
     * Flag; if true, when header operations are called after headers have been
     * sent, an exception will be raised; otherwise, processing will continue
     * as normal. Defaults to true.
     *
     * @see canSendHeaders()
     * @var boolean
     */
    public $headersSentThrowsException = true;

    /**
     * Normalize a header name
     *
     * Normalizes a header name to X-Capitalized-Names
     * 
     * @param  string $name 
     * @return string
     */
    protected function _normalizeHeader($name)
    {
        $filtered = str_replace(array('-', '_'), ' ', (string) $name);
        $filtered = ucwords(strtolower($filtered));
        $filtered = str_replace(' ', '-', $filtered);
        return $filtered;
    }

    /**
     * Set a header
     *
     * If $replace is true, replaces any headers already defined with that
     * $name.
     *
     * @param string $name
     * @param string $value
     * @param boolean $replace
     * @return Zend_Controller_Response_Abstract
     */
    public function setHeader($name, $value, $replace = false)
    {
        $this->canSendHeaders(true);
        $name  = $this->_normalizeHeader($name);
        $value = (string) $value;

        if ($replace) {
            foreach ($this->_headers as $key => $header) {
                if ($name == $header['name']) {
                    unset($this->_headers[$key]);
                }
            }
        }

        $this->_headers[] = array(
            'name'    => $name,
            'value'   => $value,
            'replace' => $replace
        );

        return $this;
    }

    /**
     * Set redirect URL
     *
     * Sets Location header and response code. Forces replacement of any prior
     * redirects.
     *
     * @param string $url
     * @param int $code
     * @return Zend_Controller_Response_Abstract
     */
    public function setRedirect($url, $code = 302)
    {
        $this->canSendHeaders(true);
        $this->setHeader('Location', $url, true)
             ->setHttpResponseCode($code);

        return $this;
    }

    /**
     * Is this a redirect?
     *
     * @return boolean
     */
    public function isRedirect()
    {
        return $this->_isRedirect;
    }

    /**
     * Return array of headers; see {@link $_headers} for format
     *
     * @return array
     */
    public function getHeaders()
    {
        return $this->_headers;
    }

    /**
     * Clear headers
     *
     * @return Zend_Controller_Response_Abstract
     */
    public function clearHeaders()
    {
        $this->_headers = array();

        return $this;
    }

    /**
     * Set raw HTTP header
     *
     * Allows setting non key => value headers, such as status codes
     *
     * @param string $value
     * @return Zend_Controller_Response_Abstract
     */
    public function setRawHeader($value)
    {
        $this->canSendHeaders(true);
        if ('Location' == substr($value, 0, 8)) {
            $this->_isRedirect = true;
        }
        $this->_headersRaw[] = (string) $value;
        return $this;
    }

    /**
     * Retrieve all {@link setRawHeader() raw HTTP headers}
     *
     * @return array
     */
    public function getRawHeaders()
    {
        return $this->_headersRaw;
    }

    /**
     * Clear all {@link setRawHeader() raw HTTP headers}
     *
     * @return Zend_Controller_Response_Abstract
     */
    public function clearRawHeaders()
    {
        $this->_headersRaw = array();
        return $this;
    }

    /**
     * Clear all headers, normal and raw
     *
     * @return Zend_Controller_Response_Abstract
     */
    public function clearAllHeaders()
    {
        return $this->clearHeaders()
                    ->clearRawHeaders();
    }

    /**
     * Set HTTP response code to use with headers
     *
     * @param int $code
     * @return Zend_Controller_Response_Abstract
     */
    public function setHttpResponseCode($code)
    {
        if (!is_int($code) || (100 > $code) || (599 < $code)) {
            require_once 'Zend/Controller/Response/Exception.php';
            throw new Zend_Controller_Response_Exception('Invalid HTTP response code');
        }

        if ((300 <= $code) && (307 >= $code)) {
            $this->_isRedirect = true;
        } else {
            $this->_isRedirect = false;
        }

        $this->_httpResponseCode = $code;
        return $this;
    }

    /**
     * Retrieve HTTP response code
     *
     * @return int
     */
    public function getHttpResponseCode()
    {
        return $this->_httpResponseCode;
    }

    /**
     * Can we send headers?
     *
     * @param boolean $throw Whether or not to throw an exception if headers have been sent; defaults to false
     * @return boolean
     * @throws Zend_Controller_Response_Exception
     */
    public function canSendHeaders($throw = false)
    {
        $ok = headers_sent($file, $line);
        if ($ok && $throw && $this->headersSentThrowsException) {
            require_once 'Zend/Controller/Response/Exception.php';
            throw new Zend_Controller_Response_Exception('Cannot send headers; headers already sent in ' . $file . ', line ' . $line);
        }

        return !$ok;
    }

    /**
     * Send all headers
     *
     * Sends any headers specified. If an {@link setHttpResponseCode() HTTP response code}
     * has been specified, it is sent with the first header.
     *
     * @return Zend_Controller_Response_Abstract
     */
    public function sendHeaders()
    {
        // Only check if we can send headers if we have headers to send
        if (count($this->_headersRaw) || count($this->_headers) || (200 != $this->_httpResponseCode)) {
            $this->canSendHeaders(true);
        } elseif (200 == $this->_httpResponseCode) {
            // Haven't changed the response code, and we have no headers
            return $this;
        }

        $httpCodeSent = false;

        foreach ($this->_headersRaw as $header) {
            if (!$httpCodeSent && $this->_httpResponseCode) {
                header($header, true, $this->_httpResponseCode);
                $httpCodeSent = true;
            } else {
                header($header);
            }
        }

        foreach ($this->_headers as $header) {
            if (!$httpCodeSent && $this->_httpResponseCode) {
                header($header['name'] . ': ' . $header['value'], $header['replace'], $this->_httpResponseCode);
                $httpCodeSent = true;
            } else {
                header($header['name'] . ': ' . $header['value'], $header['replace']);
            }
        }

        if (!$httpCodeSent) {
            header('HTTP/1.1 ' . $this->_httpResponseCode);
            $httpCodeSent = true;
        }

        return $this;
    }

    /**
     * Set body content
     *
     * If $name is not passed, or is not a string, resets the entire body and
     * sets the 'default' key to $content.
     *
     * If $name is a string, sets the named segment in the body array to
     * $content.
     *
     * @param string $content
     * @param null|string $name
     * @return Zend_Controller_Response_Abstract
     */
    public function setBody($content, $name = null)
    {
        if ((null === $name) || !is_string($name)) {
            $this->_body = array('default' => (string) $content);
        } else {
            $this->_body[$name] = (string) $content;
        }

        return $this;
    }

    /**
     * Append content to the body content
     *
     * @param string $content
     * @param null|string $name
     * @return Zend_Controller_Response_Abstract
     */
    public function appendBody($content, $name = null)
    {
        if ((null === $name) || !is_string($name)) {
            if (isset($this->_body['default'])) {
                $this->_body['default'] .= (string) $content;
            } else {
                return $this->append('default', $content);
            }
        } elseif (isset($this->_body[$name])) {
            $this->_body[$name] .= (string) $content;
        } else {
            return $this->append($name, $content);
        }

        return $this;