Generics\Client\HttpClient

Complexity

Total Complexity

57

Size/Duplication

Total Lines	456
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	7

Test Coverage

Coverage

99.43%

Importance

Changes

0

21 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	10	1
A	getHeaders()	0	4	1
A	setHeader()	0	5	1
A	resetHeaders()	0	4	1
A	appendPayload()	0	6	2
A	getPayload()	0	4	1
A	retrieveHeaders()	0	14	1
A	setTimeout()	0	8	3
B	request()	0	28	6
A	checkConnection()	0	13	3
A	adjustNumbytes()	0	9	2
A	addParsedHeader()	0	10	2
A	checkContentLengthExceeded()	0	9	3
A	handleHeader()	0	14	3
C	retrieveAndParseResponse()	0	47	8
A	appendPayloadToRequest()	0	12	2
B	prepareRequest()	0	33	4
A	adjustConnectionHeader()	0	8	2
B	adjustHeaders()	0	18	9
A	getResponseCode()	0	4	1
A	isOpen()	0	4	1

<?php

/**
 * This file is part of the PHP Generics package.
 *
 * @package Generics
 */
namespace Generics\Client;

use Generics\Streams\HttpStream;
use Generics\Streams\InputStream;
use Generics\Streams\MemoryStream;
use Generics\Socket\ClientSocket;
use Generics\Socket\Url;
use Generics\Streams\StreamException;

/**
 * This class implements a HttpStream as client
 *
 * @author Maik Greubel <greubel@nkey.de>
 */
class HttpClient extends ClientSocket implements HttpStream
{

    /**
     * Path to file on server (excluding endpoint address)
     *
     * @var string
     */
    private $path;

    /**
     * Headers
     *
     * @var array
     */
    private $headers;

    /**
     * The payload
     *
     * @var MemoryStream
     */
    private $payload;

    /**
     * The HTTP protocol version
     *
     * @var string
     */
    private $protocol;

    /**
     * Whether to use https instead of http
     *
     * @var boolean
     */
    private $secure;

    /**
     * The response status code
     *
     * @var int
     */
    private $responseCode;

    /**
     * When the connection times out (in seconds)
     *
     * @var int
     */
    private $timeout;

    /**
     * Create a new http client
     *
     * @param Url $url
     *            The url for http request
     * @param string $proto
     *            The protocol to use (default = HTTP/1.1)
     * @param integer $timeout
     *            Optional timeout for request (default = 10 seconds)
     */
    public function __construct(Url $url, $proto = 'HTTP/1.1', $timeout = 10)
    {
        parent::__construct($url);
        $this->path = $url->getPath();
        $this->secure = $url->getScheme() == 'https';
        $this->protocol = $proto;
        $this->headers = array();
        $this->payload = new MemoryStream();
        $this->timeout = $timeout;
    }

    /**
     * {@inheritDoc}
     * @see \Generics\Streams\HttpStream::getHeaders()
     */
    public function getHeaders()
    {
        return $this->headers;
    }

    /**
     * {@inheritDoc}
     * @see \Generics\Streams\HttpStream::setHeader()
     * @return HttpClient
     */
    public function setHeader($headerName, $headerValue)
    {
        $this->headers[$headerName] = $headerValue;
        return $this;
    }

    /**
     * Reset the headers
     */
    public function resetHeaders()
    {
        $this->headers = array();
    }

    /**
     * {@inheritDoc}
     * @see \Generics\Streams\HttpStream::appendPayload()
     */
    public function appendPayload(InputStream $payload)
    {
        while ($payload->ready()) {
            $this->payload->write($payload->read(1024));
        }
    }

    /**
     *{@inheritDoc}
     * @see \Generics\Streams\HttpStream::getPayload()
     */
    public function getPayload()
    {
        return $this->payload;
    }

    /**
     * Load headers from remote and return it
     *
     * @return array
     */
    public function retrieveHeaders()
    {
        $this->setHeader('Connection', 'close');
        $this->setHeader('Accept', '');
        $this->setHeader('Accept-Language', '');
        $this->setHeader('User-Agent', '');

        $savedProto = $this->protocol;
        $this->protocol = 'HTTP/1.0';
        $this->request('HEAD');
        $this->protocol = $savedProto;

        return $this->headers;
    }

    /**
     * Set connection timeout in seconds
     *
     * @param int $timeout
     */
    public function setTimeout($timeout)
    {
        $timeout = intval($timeout);
        if ($timeout < 1 || $timeout > 60) {
            $timeout = 5;
        }
        $this->timeout = $timeout;
    }

    /**
     * {@inheritDoc}
     * @see \Generics\Streams\HttpStream::request()
     */
    public function request($requestType)
    {
        if ($this->secure) {
            throw new HttpException("Secure connection using HTTPs is not supported yet!");
        }

        if ($requestType == 'HEAD') {
            $this->setTimeout(1); // Don't wait too long on simple head
        }

        $ms = $this->prepareRequest($requestType);

        $ms = $this->appendPayloadToRequest($ms);

        if (! $this->isConnected()) {
            $this->connect();
        }

        while ($ms->ready()) {
            $this->write($ms->read(1024));
        }

        $this->retrieveAndParseResponse($requestType);

        if ($this->headers['Connection'] == 'close') {
            $this->disconnect();
        }
    }

    /**
     * Check the connection availability
     *
     * @param int $start Timestamp when read request attempt starts
     * @throws HttpException
     * @return boolean
     */
    private function checkConnection($start)
    {
        if (! $this->ready()) {
            if (time() - $start > $this->timeout) {
                $this->disconnect();
                throw new HttpException("Connection timed out!");
            }

            return false;
        }

        return true;
    }

    /**
     * Adjust number of bytes to read according content length header
     *
     * @param int $numBytes
     * @return int
     */
    private function adjustNumbytes($numBytes)
    {
        if (isset($this->headers['Content-Length'])) {
            // Try to read the whole payload at once
            $numBytes = intval($this->headers['Content-Length']);
        }

        return $numBytes;
    }

    /**
     * Try to parse line as header and add the results to local header list
     *
     * @param string $line
     */
    private function addParsedHeader($line)
    {
        if (strpos($line, ':') === false) {
            $this->responseCode = HttpStatus::parseStatus($line)->getCode();
        } else {
            $line = trim($line);
            list ($headerName, $headerValue) = explode(':', $line, 2);
            $this->headers[$headerName] = trim($headerValue);
        }
    }

    /**
     * Check whether the readen bytes amount has reached the
     * content length amount
     *
     * @return boolean
     */
    private function checkContentLengthExceeded()
    {
        if (isset($this->headers['Content-Length'])) {
            if ($this->payload->count() >= $this->headers['Content-Length']) {
                return true;
            }
        }
        return false;
    }

    /**
     * Handle a header line
     *
     * All parameters by reference, which means the the values can be
     * modified during execution of this method.
     *
     * @param boolean $delimiterFound Whether the delimiter for end of header section was found
     * @param int $numBytes The number of bytes to read from remote
     * @param string $tmp The current readen line
     */
    private function handleHeader(&$delimiterFound, &$numBytes, &$tmp)
    {
        if ($tmp == "\r\n") {
            $numBytes = $this->adjustNumbytes($numBytes);
            $delimiterFound = true;
            $tmp = "";
            return;
        }

        if (substr($tmp, - 2, 2) == "\r\n") {
            $this->addParsedHeader($tmp);
            $tmp = "";
        }
    }

    /**
     * Retrieve and parse the response
     *
     * @param string $requestType
     * @throws \Generics\Client\HttpException
     * @throws \Generics\Socket\SocketException
     * @throws \Generics\Streams\StreamException
     */
    private function retrieveAndParseResponse($requestType)
    {
        $this->payload = new MemoryStream();
        $this->headers = array();

        $delimiterFound = false;

        $tmp = "";
        $numBytes = 1;
        $start = time();
        while (true) {
            if (!$this->checkConnection($start)) {
                continue;
            }

            $c = $this->read($numBytes);

            if ($c == null) {
                break;
            }

            $start = time(); // we have readen something => adjust timeout start point
            $tmp .= $c;

            if (!$delimiterFound) {
                $this->handleHeader($delimiterFound, $numBytes, $tmp);
            }

            if ($delimiterFound) {
                if ($requestType == 'HEAD') {
                    // Header readen, in type HEAD it is now time to leave
                    break;
                }

                // delimiter already found, append to payload
                $this->payload->write($tmp);
                $tmp = "";

                if ($this->checkContentLengthExceeded()) {
                    break;
                }
            }
        }

        // Set pointer to start
        $this->payload->reset();
    }

    /**
     * Append the payload buffer to the request buffer
     *
     * @param MemoryStream $ms
     * @return MemoryStream
     * @throws \Generics\Streams\StreamException
     * @throws \Generics\ResetException
     */
    private function appendPayloadToRequest(MemoryStream $ms)
    {
        $this->payload->reset();

        while ($this->payload->ready()) {
            $ms->write($this->payload->read(1024));
        }

        $ms->reset();

        return $ms;
    }

    /**
     * Prepare the request buffer
     *
     * @param string $requestType
     * @return \Generics\Streams\MemoryStream
     * @throws \Generics\Streams\StreamException
     */
    private function prepareRequest($requestType)
    {
        $ms = new MemoryStream();

        // First send the request type
        $ms->interpolate("{rqtype} {path} {proto}\r\n", array(
            'rqtype' => $requestType,
            'path' => $this->path,
            'proto' => $this->protocol
        ));

        // Add the host part
        $ms->interpolate("Host: {host}\r\n", array(
            'host' => $this->getEndpoint()
            ->getAddress()
        ));

        $this->adjustHeaders($requestType);

        // Add all existing headers
        foreach ($this->headers as $headerName => $headerValue) {
            if (isset($headerValue) && strlen($headerValue) > 0) {
                $ms->interpolate("{headerName}: {headerValue}\r\n", array(
                    'headerName' => $headerName,
                    'headerValue' => $headerValue
                ));
            }
        }

        $ms->write("\r\n");

        return $ms;
    }

    /**
     * Depending on request type the connection header is either
     * set to keep-alive or close
     *
     * @param string $requestType
     */
    private function adjustConnectionHeader($requestType)
    {
        if ($requestType == 'HEAD') {
            $this->setHeader('Connection', 'close');
        } else {
            $this->setHeader('Connection', 'keep-alive');
        }
    }

    /**
     * Adjust the headers by injecting default values for missing keys.
     */
    private function adjustHeaders($requestType)
    {
        if (!array_key_exists('Accept', $this->headers) && $requestType != 'HEAD') {
            $this->setHeader('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8');
        }

        if (!array_key_exists('Accept-Language', $this->headers) && $requestType != 'HEAD') {
            $this->setHeader('Accept-Language', 'en-US;q=0.7,en;q=0.3');
        }

        if (!array_key_exists('User-Agent', $this->headers) && $requestType != 'HEAD') {
            $this->setHeader('User-Agent', 'phpGenerics 1.0');
        }

        if (!array_key_exists('Connection', $this->headers) || strlen($this->headers['Connection']) == 0) {
            $this->adjustConnectionHeader($requestType);
        }
    }

    /**
     * Retrieve the response status code
     *
     * @return int
     */
    public function getResponseCode()
    {
        return $this->responseCode;
    }
    
    /**
     * {@inheritDoc}
     * @see \Generics\Streams\Stream::isOpen()
     */
    public function isOpen()
    {
    	return true;
    }
}