response.php

Bug tracker, and reporter.

     * Get the HTTP response status code
     *
     * @return int
     */
    public function getStatus()
    {
        return $this->code;
    }

    /**
     * Return a message describing the HTTP response code
     * (Eg. "OK", "Not Found", "Moved Permanently")
     *
     * @return string
     */
    public function getMessage()
    {
        return $this->message;
    }

    /**
     * Get the response headers
     *
     * @return array
     */
    public function getHeaders()
    {
        return $this->headers;
    }

    /**
     * Get a specific header as string, or null if it is not set
     *
     * @param string$header
     * @return string|array|null
     */
    public function getHeader($header)
    {
        $header = ucwords(strtolower($header));
        if (! is_string($header) || ! isset($this->headers[$header])) return null;

        return $this->headers[$header];
    }

    /**
     * Get all headers as string
     *
     * @param boolean $status_line Whether to return the first status line (IE "HTTP 200 OK")
     * @param string $br Line breaks (eg. "\n", "\r\n", "<br />")
     * @return string
     */
    public function getHeadersAsString($status_line = true, $br = "\n")
    {
        $str = '';

        if ($status_line) {
            $str = "HTTP/{$this->version} {$this->code} {$this->message}{$br}";
        }

        // Iterate over the headers and stringify them
        foreach ($this->headers as $name => $value)
        {
            if (is_string($value))
                $str .= "{$name}: {$value}{$br}";

            elseif (is_array($value)) {
                foreach ($value as $subval) {
                    $str .= "{$name}: {$subval}{$br}";
                }
            }
        }

        return $str;
    }

    /**
     * Get the entire response as string
     *
     * @param string $br Line breaks (eg. "\n", "\r\n", "<br />")
     * @return string
     */
    public function asString($br = "\n")
    {
        return $this->getHeadersAsString(true, $br) . $br . $this->getBody();
    }

    /**
     * A convenience function that returns a text representation of
     * HTTP response codes. Returns 'Unknown' for unknown codes.
     * Returns array of all codes, if $code is not specified.
     *
     * Conforms to HTTP/1.1 as defined in RFC 2616 (except for 'Unknown')
     * See http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10 for reference
     *
     * @param int $code HTTP response code
     * @param boolean $http11 Use HTTP version 1.1
     * @return string
     */
    public static function responseCodeAsText($code = null, $http11 = true)
    {
        $messages = self::$messages;
        if (! $http11) $messages[302] = 'Moved Temporarily';

        if ($code === null) {
            return $messages;
        } elseif (isset($messages[$code])) {
            return $messages[$code];
        } else {
            return 'Unknown';
        }
    }

    /**
     * Extract the response code from a response string
     *
     * @param string $response_str
     * @return int
     */
    public static function extractCode($response_str)
    {
        preg_match("|^HTTP/[\d\.x]+ (\d+)|", $response_str, $m);

        if (isset($m[1])) {
            return (int) $m[1];
        } else {
            return false;
        }
    }

    /**
     * Extract the HTTP message from a response
     *
     * @param string $response_str
     * @return string
     */
    public static function extractMessage($response_str)
    {
        preg_match("|^HTTP/[\d\.x]+ \d+ ([^\r\n]+)|", $response_str, $m);

        if (isset($m[1])) {
            return $m[1];
        } else {
            return false;
        }
    }

    /**
     * Extract the HTTP version from a response
     *
     * @param string $response_str
     * @return string
     */
    public static function extractVersion($response_str)
    {
        preg_match("|^HTTP/([\d\.x]+) \d+|", $response_str, $m);

        if (isset($m[1])) {
            return $m[1];
        } else {
            return false;
        }
    }

    /**
     * Extract the headers from a response string
     *
     * @param string $response_str
     * @return array
     */
    public static function extractHeaders($response_str)
    {
        $headers = array();
        
        // First, split body and headers
        $parts = preg_split('|(?:\r?\n){2}|m', $response_str, 2);
        if (! $parts[0]) return $headers;
        
        // Split headers part to lines
        $lines = explode("\n", $parts[0]);
        unset($parts);
        $last_header = null;

        foreach($lines as $line) {
            $line = trim($line, "\r\n");
            if ($line == "") break;

            if (preg_match("|^([\w-]+):\s+(.+)|", $line, $m)) {
                unset($last_header);
                $h_name = strtolower($m[1]);
                $h_value = $m[2];

                if (isset($headers[$h_name])) {
                    if (! is_array($headers[$h_name])) {
                        $headers[$h_name] = array($headers[$h_name]);
                    }

                    $headers[$h_name][] = $h_value;
                } else {
                    $headers[$h_name] = $h_value;
                }
                $last_header = $h_name;
            } elseif (preg_match("|^\s+(.+)$|", $line, $m) && $last_header !== null) {
                if (is_array($headers[$last_header])) {
                    end($headers[$last_header]);
                    $last_header_key = key($headers[$last_header]);
                    $headers[$last_header][$last_header_key] .= $m[1];
                } else {
                    $headers[$last_header] .= $m[1];
                }
            }
        }

        return $headers;
    }

    /**
     * Extract the body from a response string
     *
     * @param string $response_str
     * @return string
     */
    public static function extractBody($response_str)
    {
        $parts = preg_split('|(?:\r?\n){2}|m', $response_str, 2);
        if (isset($parts[1])) { 
        	return $parts[1];
        } else {
        	return '';
        }
    }

    /**
     * Decode a "chunked" transfer-encoded body and return the decoded text
     *
     * @param string $body
     * @return string
     */
    public static function decodeChunkedBody($body)
    {
        $decBody = '';
        
        while (trim($body)) {
            if (! preg_match("/^([\da-fA-F]+)[^\r\n]*\r\n/sm", $body, $m)) {
                require_once 'Zend/Http/Exception.php';
                throw new Zend_Http_Exception("Error parsing body - doesn't seem to be a chunked message");
            }

            $length = hexdec(trim($m[1]));
            $cut = strlen($m[0]);

            $decBody .= substr($body, $cut, $length);
            $body = substr($body, $cut + $length + 2);
        }

        return $decBody;
    }

    /**
     * Decode a gzip encoded message (when Content-encoding = gzip)
     *
     * Currently requires PHP with zlib support
     *
     * @param string $body
     * @return string
     */
    public static function decodeGzip($body)
    {
        if (! function_exists('gzinflate')) {
            require_once 'Zend/Http/Exception.php';
            throw new Zend_Http_Exception('Unable to decode gzipped response ' . 
                'body: perhaps the zlib extension is not loaded?'); 
        }

        return gzinflate(substr($body, 10));
    }

    /**
     * Decode a zlib deflated message (when Content-encoding = deflate)
     *
     * Currently requires PHP with zlib support
     *
     * @param string $body
     * @return string
     */
    public static function decodeDeflate($body)
    {
        if (! function_exists('gzuncompress')) {
            require_once 'Zend/Http/Exception.php';
            throw new Zend_Http_Exception('Unable to decode deflated response ' . 
                'body: perhaps the zlib extension is not loaded?'); 
        }

    	return gzuncompress($body);
    }

    /**
     * Create a new Zend_Http_Response object from a string
     *
     * @param string $response_str
     * @return Zend_Http_Response
     */
    public static function fromString($response_str)
    {
        $code    = self::extractCode($response_str);
        $headers = self::extractHeaders($response_str);
        $body    = self::extractBody($response_str);
        $version = self::extractVersion($response_str);
        $message = self::extractMessage($response_str);

        return new Zend_Http_Response($code, $headers, $body, $version, $message);
    }
}