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<?php
/**
 * A class to send very easy an HTTP request.
 *
 * With this class, you can easily send an HTTP request to a given url. Just
 * give the url and, if necessary, an array with arguments and the port.
 * With another function you send the request, and finaly, you can recieve the
 * respons with a last function.
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 2.0-augustus 2008
 * @acces public
 */
class httpRequest {
    /* ########## The variables ########## */
    /* ################################### */
    
    /**
     * @var string The variable that contains the given url, excepted 'http://'.
     */
    protected $strUrl;
    /**
     * @var string The variable that contains the host, stripped from the givin url.
     */
    protected $strHost;
    /**
     * @var string The variable that contains the path to the file, stripped from the given url.
     */
    protected $strPath;
    /**
     * @var int The variable that contains the port of the connection.
     */
    protected $intPort;
    /**
     * @var string The variable that tells which protocol will be used.
     */
    protected $strProtocol;
    
    
    /**
     * @var resource The variable that contains the resource opened by fsockopen.
     */
    protected $resFilePointer;
    
    
    /**
     * @var object The variable that contains an object of httpHeaders.
     */
    public $headers;
    
    /**
     * @var object The variable that contains an object of httpArguments.
     */
    public $arguments;
    
    /**
     * @var object The variable that contains an object of httpResponse.
     */
    public $response;
    
    /* ########## The public functions ########## */
    /* ########################################## */
    
    /**
     * @desc Constructor.
     *
     * @param string URL to the script where the request will be send to.
     * @param string [optional] The protocol which will be used.
     * @param int [optional] The port which will be used for connecting. Default: 80.
     *
     * @return bool
     */
    public function __construct($strUrl, $strProtocol="post", $intPort=80) {
        // Check the parameters.
        if (!is_string($strUrl)) {
            throw new HttpParameterException("\$strUrl must be a string", __METHOD__);
        }
        if (!is_string($strProtocol)) {
            throw new HttpParameterException("\$strProtocol must be a string", __METHOD__);
        }
        if (!is_int($intPort)) {
            throw new HttpParameterException("\$intPort must be an integer", __METHOD__);
        }
        
        // Process the url and put it in a private variable.
        $this->processUrl($strUrl);
        
        // Process the port and put it in a private variable.
        $this->processPort($intPort);
        
        // Process the protocol and put it in a private variable.
        $this->processProtocol($strProtocol);
        
        // Prepare the headers.
        $this->headers = new httpHeaders();
        
        // Prepare the arguments.
        $this->arguments = new httpArguments();
        
        return true;
    }
    
    /**
     * @desc Destructor. Closes the connection if it's still open.
     *
     * @return bool
     */
    public function __destruct() {
        if ($this->resFilePointer) {
            if (!fclose($this->resFilePointer)) {
                throw new HttpConnectionException ("cannot close the connection");
            }
        }
        
        return true;
    }
    
    /**
     * @desc The function that opens the connection and sends the arguments.
     *
     * @param int [optional] The connection timeout, in secconds. Default: 30.
     *
     * @return object
     */
    public function execute($intTimeout = 30) {
        // Checks the parameter
        if (!is_int($intTimeout)) {
            throw new HttpParameterException("\$intTimeout must be an integer", __METHOD__);
        }
        
        // Add the default headers.
        // Tell what protocol will be used for the request, and to which path.
        $this->headers->add($this->strProtocol." ".$this->strPath." HTTP/1.1");
        // Tell which content type it is.
        $this->headers->add("Content-Type: application/x-www-form-urlencoded");
        // Tell the length of the string with arguments.
        $this->headers->add("Content-Length: ".$this->arguments->length());
        // Tell that the connection must be closed afterwards.
        $this->headers->add("Connection: Close");
        
        // Open the connection.
        $this->resFilePointer = fsockopen($this->strHost, $this->intPort, $intErrNumber, $strErrMessage, $intTimeout);
        if (!$this->resFilePointer) {
            $strErrMessage = (empty($strErrMessage)) ? "probably wrong hostname" : $strErrMessage;
            throw new HttpConnectionException ($strErrMessage);
        }
        // Send the header.
        if (fputs($this->resFilePointer, $this->headers) === false) {
            throw new HttpConnectionException ("cannot send header");
        }
        // Send the arguments.
        if (fputs($this->resFilePointer, $this->arguments) === false) {
            throw new HttpConnectionException ("cannot send arguments");
        }
        
        // Get the response and put it in object
        $this->getResponse();
        
        return $this->response;
    }
    
    
    /* ########## The protected functions ########## */
    /* ############################################# */
    
    /**
     * @desc The function that processes the url and put it in a private variable.
     *
     * @param string URL to the script where the request will be send to.
     *
     * @return bool
     */
    protected function processUrl($strUrl) {
        // Checks the parameter.
        if (!is_string($strUrl)) {
            throw new HttpParameterException("\$strUrl must be a string", __METHOD__);
        }
        
        // Removes 'http://' from the url.
        if (substr($strUrl, 0, 7) == "http://") {
            $strUrl = substr($strUrl, 7);
        }
        
        // Retrieves the host and path from the url.
        list($strHost, $strPath) = explode("/", $strUrl, 2);
        
        // Add a slash in front of the path.
        $strPath = "/".$strPath;
        
        // Removes the port from the host
        $intPosSeparator = strpos($strHost, ":");
        if ($intPosSeparator) {
            $strPort = substr($strHost, $intPosSeparator+1);
            $strHost = substr($strHost, 0, $intPosSeparator);
        }
        
        // Checks the port
        if (!empty($strPort)) {
            $this->processPort($strPort);
        }
        
        // Puts the founded url, host and path in private variables.
        $this->strUrl = $strUrl;
        $this->strHost = $strHost;
        $this->strPath = $strPath;
        
        return true;
    }
    
    /**
     * @desc The function that checks the port and put it in a private variable if it's correct.
     *
     * @param int The port.
     *
     * @return bool
     */
    protected function processPort($intPort) {
        // Checks the parameter.
        if (!is_int($intPort)) {
            throw new HttpParameterException("\$intPort must be an integer", __METHOD__);
        }
        
        // Check if it's between 0 and 65535.
        if ($intPort >= 0 && $intPort <= 65535) {
            // The port is correct, put it in a private variable.
            $this->intPort = $intPort;
            
            return true;
        }
        else {
            throw new HttpPortException ("the port must be between 0 and 65535");
        }
        
        return false;
    }
    
    /**
     * @desc The function that checks the protocol and put it in a private variable if it's correct.
     *
     * @param string The protocol.
     *
     * @return bool
     */
    protected function processProtocol($strProtocol) {
        // Checks the parameter.
        if (!is_string($intPort)) {
            throw new HttpParameterException("\$strProtocol must be a string", __METHOD__);
        }
        
        // The array of accepted protocols (in uppercase!!)
        // Source: http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
        $arrAcceptedProtocols = array ("OPTIONS", "GET", "HEAD", "POST", "PUT", "DELETE", "TRACE", "CONNECT");
        
        // Make given protocol uppercase.
        $strProtocol = strtoupper($strProtocol);
        
        // Checks if the given protocol is accepted.
        if (in_array($strProtocol, $arrAcceptedProtocols)) {
            // The protocol is correct, put it in a private variable.
            $this->strProtocol = $strProtocol;
            
            return true;
        }
        else {
            // Throw Exception
            // Make message (use $arrAcceptedProtocols)
            $strExceptionMessage = "the protocol must be ";
            foreach($arrAcceptedProtocols as $intKey => $strProtocol) {
                if ($intKey != 0 && $intKey < (count($arrAcceptedProtocols)-1)) {
                    $strExceptionMessage .= ", ";
                }
                elseif ($intKey == (count($arrAcceptedProtocols)-1)) {
                    $strExceptionMessage .= " or ";
                }
                $strExceptionMessage .= $strProtocol;
            }
            throw new HttpProtocolException($strExceptionMessage);
        }
        
        return false;
    }
    
    /**
     * @desc The function that retrieves the response and puts it in an object.
     *
     * @return bool
     */
    protected function getResponse () {
        $strResponse = "";
        while (!feof($this->resFilePointer)) {
            $strResponse .= fread($this->resFilePointer, 4096);
        }
        
        // Process the response...
        list($strResponseHeader, $strResponseBody) = explode("\r\n\r\n", $strResponse, 2);
        // ...and puts it in an object
        $this->response = new httpResponse ($strResponseHeader, $strResponseBody);
        
        return true;
    }
}

/**
 * A class which contains the headers of the httpRequest-class.
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class httpHeaders {
    /* ########## The variables ########## */
    /* ################################### */
    
    /**
     * @var array The variable that contains an array with all headers.
     */
    protected $arrHeaders;
    
    /* ########## The public functions ########## */
    /* ########################################## */
    
    /**
     * @desc Constructor.
     *
     * @return void
     */
    public function __construct () {
        $this->arrHeaders = array();
    }
    
    /**
     * @desc toString.
     *
     * @return string
     */
    public function __toString() {
        return implode("\r\n", $this->arrHeaders)."\r\n";
    }
    
    /**
     * @desc The function to add a header.
     *
     * @param string The header to add.
     *
     * @return bool
     */
    public function add($strHeader) {
        // Checks the parameter.
        if (!is_string($strHeader)) {
            throw new HttpParameterException("\$strHeader must be a string", __METHOD__);
        }
        
        $this->arrHeaders[] = $strHeader;
    }
    
    /**
     * @desc The function to get the array with headers.
     *
     * @return array
     */
    public function getArray() {
        return $this->arrHeaders;
    }
    
    /**
     * @desc The function that removes all the headers.
     *
     * @return bool
     */
    public function clear() {
        $this->arrHeaders = array();
        return true;
    }
}

/**
 * A class which contains the arguments of the httpRequest-class.
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class httpArguments {
    /* ########## The variables ########## */
    /* ################################### */
    
    /**
     * @var array The variable that contains an array with all arguments.
     */
    protected $arrArguments;
    
    /* ########## The public functions ########## */
    /* ########################################## */
    
    /**
     * @desc Constructor.
     *
     * @return void
     */
    public function __construct () {
        $this->arrArguments = array();
    }
    
    /**
     * @desc toString.
     *
     * @return string
     */
    public function __toString() {
        $strArguments = "";
        foreach ($this->arrArguments as $mixName => $mixValue) {
            $strArguments .= "&".$mixName."=".$mixValue;
        }
        
        // Remove the first ampersand (&).
        return $strArguments = substr($strArguments, 1);
    }
    
    /**
     * @desc The function to add arguments.
     *
     * @param array The arguments to add.
     *
     * @return bool
     */
    public function add($arrArguments) {
        // Checks the parameter.
        if (!is_array($arrArguments)) {
            throw new HttpParameterException("\$arrArguments must be an array", __METHOD__);
        }
        
        // Encode the values of the arguments.
        // DON'T ENCODE THE NAMES!!!
        $arrArgumentsEncoded = array();
        foreach ($arrArguments as $mixName => $mixValue) {
            $arrArgumentsEncoded[$mixName] = urlencode($mixValue);
        }
        
        $this->arrArguments = array_merge($this->arrArguments, $arrArgumentsEncoded);
        
        return true;
    }
    
    /**
     * @desc The function that returns the length of the string.
     *
     * @return int
     */
    public function length() {
        return strlen($this->__toString());
    }
    
    /**
     * @desc The function to get the array with arguments.
     *
     * @return array
     */
    public function getArray() {
        return $this->arrArguments;
    }
    
    /**
     * @desc The function that removes all the arguments.
     *
     * @return bool
     */
    public function clear() {
        $this->arrArguments = array();
        return true;
    }
}

/**
 * A class which contains the respons of the httpRequest-class.
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class httpResponse {
    /* ########## The variables ########## */
    /* ################################### */
    
    /**
     * @var object The variable that contains an object of httpHeaders to return.
     */
    protected $objHeaders;
    
    /**
     * @var string The variable that contains the response body.
     */
    protected $strBody;
    
    
    /* ########## The public functions ########## */
    /* ########################################## */
    
    /**
     * @desc Constructor.
     *
     * @param string The response headers.
     * @param string The response body.
     *
     * @return bool
     */
    public function __construct ($strHeaders, $strBody) {
        // Checks the parameters.
        if (!is_string($strHeaders)) {
            throw new HttpParameterException("\$strHeaders must be a string", __METHOD__);
        }
        if (!is_string($strBody)) {
            throw new HttpParameterException("\$strBody must be a string", __METHOD__);
        }
        
        // There has to be given a header.
        if (empty($strHeaders)) {
            // If not:
            throw new HttpResponseException ("The response doesn't contain a header.");
        }
        else {
            $this->objHeaders = $this->createHeadersObject($strHeaders);
            $this->strBody = $strBody;
        }
    }
    
    /**
     * @desc The function that returns the headers.
     *
     * @return string
     */
    public function getHeaders() {
        return $this->objHeaders;
    }
    
    /**
     * @desc The function that returns the body.
     *
     * @return string
     */
    public function getBody() {
        return $this->strBody;
    }
    
    
    /* ########## The protected functions ########## */
    /* ############################################# */
    
    /**
     * @desc The function that makes the httpHeaders object to return.
     *
     * @param string The variable that contains the headers as a string.
     *
     * @return object
     */
    protected function createHeadersObject($strHeaders) {
        // Checks the parameter
        if (!is_string($strHeaders)) {
            throw new HttpParameterException("\$strHeaders must be a string", __METHOD__);
        }
        
        // Create the object.
        $objHeaders = new httpHeaders();
        // Make an array with headers
        $arrHeaders = explode("\r\n", $strHeaders);
        // Put them into the object
        foreach ($arrHeaders as $strHeader) {
            $objHeaders->add($strHeader);
        }
        // Return the object
        return $objHeaders;
    }
}

/**
 * A class to create a new HttpException
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class HttpException extends Exception {
    /**
     * @var string The exception name.
     */
    protected $strExceptionName;
    
    /**
     * @var string The error name.
     */
    protected $strErrorName;
    
    /**
     * @desc The function that overwrites the construct-function.
     *
     * @param string The message.
     * @param int [optional] The code.
     *
     * @return void
     */
    public function __construct($strMessage, $intCode=0) {
        // Checks the parameters.
        if (!is_string($strMessage)) {
            throw new HttpParameterException("\$strMessage must be a string", __METHOD__);
        }
        if (!is_int($intCode)) {
            throw new HttpParameterException("\$intCode must be an integer", __METHOD__);
        }
        
        // Call parent constructor.
        parent::__construct($strMessage, $intCode);
    }
    
    /**
     * @desc The function to display the exception.
     *
     * @return string
     */
    public function __toString() {
        return "<br />\n<b>".$this->strExceptionName."</b>: ".$this->strErrorName.", ".$this->message." in <b>".$this->file."</b> on line <b>".$this->line."</b>";
    }
}

/**
 * A class to create a new HttpConnectionException
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class HttpConnectionException extends HttpException {
    /**
     * @var string The exception name.
     */
    protected $strExceptionName = __CLASS__;
    
    /**
     * @var string The error name.
     */
    protected $strErrorName = "connection error";
}

/**
 * A class to create a new HttpPortException
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class HttpPortException extends HttpException {
    /**
     * @var string The exception name.
     */
    protected $strExceptionName = __CLASS__;
    
    /**
     * @var string The error name.
     */
    protected $strErrorName = "port error";
}

/**
 * A class to create a new HttpProtocolException
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class HttpProtocolException extends HttpException {
    /**
     * @var string The exception name.
     */
    protected $strExceptionName = __CLASS__;
    
    /**
     * @var string The error name.
     */
    protected $strErrorName = "protocol error";
}

/**
 * A class to create a new HttpResponseException
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class HttpResponseException extends HttpException {
    /**
     * @var string The exception name.
     */
    protected $strExceptionName = __CLASS__;
    
    /**
     * @var string The error name.
     */
    protected $strErrorName = "response error";
}

/**
 * A class to create a new HttpParameterException
 *
 * @package httpRequest
 * @author Daan van Marsbergen
 * @version 1.0-augustus 2008
 * @acces public
 */
class HttpParameterException extends HttpException {
    /**
     * @var string The exception name.
     */
    protected $strExceptionName = __CLASS__;
    
    /**
     * @var string The error name.
     */
    protected $strErrorName = "parameter error";
    
    /**
     * @desc The function that overwrites the construct-function.
     *
     * @param string The message.
     * @param string [optional] The method name where the error occured.
     * @param int [optional] The code.
     *
     * @return void
     */
    public function __construct($strMessage, $strMethod=NULL, $intCode=0) {
        // Checks the parameters.
        if (!is_string($strMessage)) {
            throw new HttpParameterException("\$strMessage must be a string", __METHOD__);
        }
        if (!is_string($strMethod) && !empty($strMethod)) {
            throw new HttpParameterException("\$strMethod must be a string", __METHOD__);
        }
        if (!is_int($intCode)) {
            throw new HttpParameterException("\$intCode must be an integer", __METHOD__);
        }
        
        // Add the method name to the message.
        if ($strMethod != NULL) {
            $strMessage .= " [<i>".$strMethod."()</i>]";
        }
        
        // Call parent constructor.
        parent::__construct($strMessage, $intCode);
    }
}
?>


Voorbeeld hoe te gebruiken:
Code (php)
PHP script in nieuw venster Selecteer het PHP script
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<?php
// Bij het maken van het object, wordt de url, het protocol en de poort gegeven.
// Dat kan op twee manieren: (let op de poort)
$httpRequest = new httpRequest("http://www.website.nl/script.php", "post", 80);
// Of:
$httpRequest = new httpRequest("http://www.website.nl:80/script.php", "post");

// Daarna worden de argumenten toegevoegd:
$arguments = array ('var1' => 'value1', 'var2' = 'value2');
$httpRequest->arguments->add($arguments);
// De argumenten kunnen ook weer worden weggehaald met:
$httpRequest->arguments->clear();

// Vervolgens worden de headers toegevoegd:
$httpRequest->headers->add('Keep-Alive: 300');
// En dit kan ook weer worden weggehaald met:
$httpRequest->headers->clear();
// De standaard headers (die altijd verzonden worden) staan op regel 122-129.

// Als alles klaar is, verzend je de HTTP request
$httpRequest->execute()
// Eventueel kan je ook vertellen hoe lang hij daar over mag doen:
$httpRequest->execute(30) // 30 seconden (standaard)

// Tot slot kan je het resultaat ophalen.
// De headers die teruggestuurd werden:
$objHeaders = $httpRequest->response->getHeaders();
echo $objHeaders;
print_r($objHeaders->getArray());
// De body (rest) die teruggestuurd werd:
echo $httpRequest->response->getBody();

// Ook kan je de verzonden headers en argumenten altijd ophalen.
// Headers:
echo $httpRequest->headers; // Als string
print_r($httpRequest->headers->getArray()); // Als array
// Argumenten:
echo $httpRequest->arguments; // Als string
print_r($httpRequest->arguments->getArray()); // Als array

?>


Gebruik van excepties:
Code (php)
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<?php
// Bijvoorbeeld bij het uitvoeren van de request.
try {
    $httpRequest->execute(30);
}
catch (HttpParameterException $e) {
    // Verkeerde parameter meegegeven, bijvoorbeeld een string ipv een int.
}
catch (HttpException $e) {
    // Elke exceptie die door deze classe wordt gegooid
}
catch (Exception $e) {
    // Elke exceptie
}
?>

Je hebt dus drie niveaus van excepties, waarvan twee door mij zijn gemaakt.
  • Exception: elke exceptie, maakt niet uit waar vandaan.
  • HttpException: elke exceptie die door deze class wordt gegooid, voldoet hieraan.
  • Gedetailleerdere excepties. Dit zijn:
    • HttpConnectionException (fout bij het versturen van de request)
    • HttpPortException (ongeldige port opgegeven)
    • HttpProtocolException (ongeldig protocol opgegeven)
    • HttpResponseException (een fout in de response)
    • HttpParameterException (een verkeerde parameter meegegeven)

 
 

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