618 lines
13 KiB
PHP
618 lines
13 KiB
PHP
<?php
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namespace PicoFeed\Client;
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use LogicException;
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use PicoFeed\Logging\Logger;
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/**
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* Client class
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*
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* @author Frederic Guillot
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* @package client
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*/
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abstract class Client
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{
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/**
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* Flag that say if the resource have been modified
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*
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* @access private
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* @var bool
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*/
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private $is_modified = true;
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/**
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* HTTP Content-Type
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*
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* @access private
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* @var string
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*/
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private $content_type = '';
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/**
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* HTTP encoding
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*
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* @access private
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* @var string
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*/
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private $encoding = '';
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/**
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* HTTP Etag header
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*
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* @access protected
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* @var string
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*/
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protected $etag = '';
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/**
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* HTTP Last-Modified header
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*
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* @access protected
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* @var string
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*/
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protected $last_modified = '';
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/**
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* Proxy hostname
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*
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* @access protected
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* @var string
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*/
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protected $proxy_hostname = '';
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/**
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* Proxy port
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*
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* @access protected
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* @var integer
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*/
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protected $proxy_port = 3128;
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/**
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* Proxy username
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*
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* @access protected
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* @var string
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*/
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protected $proxy_username = '';
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/**
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* Proxy password
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*
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* @access protected
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* @var string
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*/
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protected $proxy_password = '';
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/**
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* Basic auth username
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*
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* @access protected
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* @var string
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*/
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protected $username = '';
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/**
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* Basic auth password
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*
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* @access protected
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* @var string
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*/
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protected $password = '';
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/**
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* Client connection timeout
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*
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* @access protected
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* @var integer
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*/
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protected $timeout = 10;
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/**
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* User-agent
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*
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* @access protected
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* @var string
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*/
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protected $user_agent = 'PicoFeed (https://github.com/fguillot/picoFeed)';
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/**
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* Real URL used (can be changed after a HTTP redirect)
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*
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* @access protected
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* @var string
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*/
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protected $url = '';
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/**
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* Page/Feed content
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*
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* @access protected
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* @var string
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*/
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protected $content = '';
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/**
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* Number maximum of HTTP redirections to avoid infinite loops
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*
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* @access protected
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* @var integer
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*/
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protected $max_redirects = 5;
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/**
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* Maximum size of the HTTP body response
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*
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* @access protected
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* @var integer
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*/
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protected $max_body_size = 2097152; // 2MB
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/**
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* HTTP response status code
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*
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* @access protected
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* @var integer
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*/
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protected $status_code = 0;
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/**
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* Do the HTTP request
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*
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* @abstract
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* @access public
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* @return array
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*/
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abstract public function doRequest();
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/**
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* Get client instance: curl or stream driver
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*
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* @static
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* @access public
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* @return \PicoFeed\Client\Client
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*/
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public static function getInstance()
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{
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if (function_exists('curl_init')) {
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return new Curl;
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}
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else if (ini_get('allow_url_fopen')) {
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return new Stream;
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}
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throw new LogicException('You must have "allow_url_fopen=1" or curl extension installed');
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}
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/**
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* Perform the HTTP request
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*
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* @access public
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* @param string $url URL
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* @return Client
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*/
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public function execute($url = '')
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{
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if ($url !== '') {
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$this->url = $url;
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}
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Logger::setMessage(get_called_class().' Fetch URL: '.$this->url);
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Logger::setMessage(get_called_class().' Etag provided: '.$this->etag);
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Logger::setMessage(get_called_class().' Last-Modified provided: '.$this->last_modified);
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$response = $this->doRequest();
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$this->status_code = $response['status'];
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$this->handleNotModifiedResponse($response);
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$this->handleNotFoundResponse($response);
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$this->handleNormalResponse($response);
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return $this;
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}
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/**
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* Handle not modified response
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*
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* @access public
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* @param array $response Client response
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*/
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public function handleNotModifiedResponse(array $response)
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{
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if ($response['status'] == 304) {
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$this->is_modified = false;
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}
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else if ($response['status'] == 200) {
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$this->is_modified = $this->hasBeenModified($response, $this->etag, $this->last_modified);
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$this->etag = $this->getHeader($response, 'ETag');
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$this->last_modified = $this->getHeader($response, 'Last-Modified');
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}
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if ($this->is_modified === false) {
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Logger::setMessage(get_called_class().' Resource not modified');
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}
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}
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/**
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* Handle not found response
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*
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* @access public
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* @param array $response Client response
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*/
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public function handleNotFoundResponse(array $response)
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{
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if ($response['status'] == 404) {
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throw new InvalidUrlException('Resource not found');
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}
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}
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/**
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* Handle normal response
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*
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* @access public
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* @param array $response Client response
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*/
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public function handleNormalResponse(array $response)
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{
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if ($response['status'] == 200) {
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$this->content = $response['body'];
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$this->content_type = $this->findContentType($response);
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$this->encoding = $this->findCharset();
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}
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}
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/**
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* Check if a request has been modified according to the parameters
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*
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* @access public
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* @param array $response
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* @param string $etag
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* @param string $lastModified
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* @return boolean
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*/
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private function hasBeenModified($response, $etag, $lastModified)
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{
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$headers = array(
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'Etag' => $etag,
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'Last-Modified' => $lastModified
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);
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// Compare the values for each header that is present
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$presentCacheHeaderCount = 0;
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foreach ($headers as $key => $value) {
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if (isset($response['headers'][$key])) {
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if ($response['headers'][$key] !== $value) {
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return true;
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}
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$presentCacheHeaderCount++;
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}
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}
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// If at least one header is present and the values match, the response
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// was not modified
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if ($presentCacheHeaderCount > 0) {
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return false;
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}
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return true;
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}
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/**
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* Find content type from response headers
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*
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* @access public
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* @param array $response Client response
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* @return string
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*/
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public function findContentType(array $response)
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{
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return strtolower($this->getHeader($response, 'Content-Type'));
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}
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/**
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* Find charset from response headers
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*
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* @access public
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* @return string
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*/
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public function findCharset()
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{
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$result = explode('charset=', $this->content_type);
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return isset($result[1]) ? $result[1] : '';
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}
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/**
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* Get header value from a client response
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*
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* @access public
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* @param array $response Client response
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* @param string $header Header name
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* @return string
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*/
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public function getHeader(array $response, $header)
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{
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return isset($response['headers'][$header]) ? $response['headers'][$header] : '';
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}
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/**
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* Set the Last-Modified HTTP header
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*
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* @access public
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* @param string $last_modified Header value
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* @return \PicoFeed\Client\Client
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*/
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public function setLastModified($last_modified)
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{
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$this->last_modified = $last_modified;
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return $this;
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}
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/**
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* Get the value of the Last-Modified HTTP header
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*
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* @access public
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* @return string
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*/
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public function getLastModified()
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{
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return $this->last_modified;
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}
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/**
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* Set the value of the Etag HTTP header
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*
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* @access public
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* @param string $etag Etag HTTP header value
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* @return \PicoFeed\Client\Client
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*/
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public function setEtag($etag)
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{
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$this->etag = $etag;
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return $this;
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}
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/**
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* Get the Etag HTTP header value
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*
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* @access public
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* @return string
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*/
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public function getEtag()
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{
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return $this->etag;
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}
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/**
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* Get the final url value
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*
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* @access public
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* @return string
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*/
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public function getUrl()
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{
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return $this->url;
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}
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/**
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* Set the url
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*
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* @access public
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* @return string
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* @return \PicoFeed\Client\Client
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*/
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public function setUrl($url)
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{
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$this->url = $url;
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return $this;
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}
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/**
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* Get the HTTP response status code
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*
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* @access public
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* @return integer
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*/
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public function getStatusCode()
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{
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return $this->status_code;
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}
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/**
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* Get the body of the HTTP response
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*
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* @access public
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* @return string
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*/
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public function getContent()
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{
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return $this->content;
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}
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/**
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* Get the content type value from HTTP headers
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*
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* @access public
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* @return string
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*/
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public function getContentType()
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{
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return $this->content_type;
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}
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/**
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* Get the encoding value from HTTP headers
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*
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* @access public
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* @return string
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*/
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public function getEncoding()
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{
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return $this->encoding;
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}
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/**
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* Return true if the remote resource has changed
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*
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* @access public
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* @return bool
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*/
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public function isModified()
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{
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return $this->is_modified;
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}
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/**
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* Set connection timeout
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*
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* @access public
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* @param integer $timeout Connection timeout
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* @return \PicoFeed\Client\Client
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*/
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public function setTimeout($timeout)
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{
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$this->timeout = $timeout ?: $this->timeout;
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return $this;
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}
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/**
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* Set a custom user agent
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*
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* @access public
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* @param string $user_agent User Agent
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* @return \PicoFeed\Client\Client
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*/
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public function setUserAgent($user_agent)
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{
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$this->user_agent = $user_agent ?: $this->user_agent;
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return $this;
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}
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/**
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* Set the mximum number of HTTP redirections
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*
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* @access public
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* @param integer $max Maximum
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* @return \PicoFeed\Client\Client
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*/
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public function setMaxRedirections($max)
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{
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$this->max_redirects = $max ?: $this->max_redirects;
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return $this;
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}
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/**
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* Set the maximum size of the HTTP body
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*
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* @access public
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* @param integer $max Maximum
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* @return \PicoFeed\Client\Client
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*/
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public function setMaxBodySize($max)
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{
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$this->max_body_size = $max ?: $this->max_body_size;
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return $this;
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}
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/**
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* Set the proxy hostname
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*
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* @access public
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* @param string $hostname Proxy hostname
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyHostname($hostname)
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{
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$this->proxy_hostname = $hostname ?: $this->proxy_hostname;
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return $this;
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}
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/**
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* Set the proxy port
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*
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* @access public
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* @param integer $port Proxy port
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyPort($port)
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{
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$this->proxy_port = $port ?: $this->proxy_port;
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return $this;
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}
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/**
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* Set the proxy username
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*
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* @access public
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* @param string $username Proxy username
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyUsername($username)
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{
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$this->proxy_username = $username ?: $this->proxy_username;
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return $this;
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}
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/**
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* Set the proxy password
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*
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* @access public
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* @param string $password Password
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyPassword($password)
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{
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$this->proxy_password = $password ?: $this->proxy_password;
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return $this;
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}
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/**
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* Set the username
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*
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* @access public
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* @param string $username Basic Auth username
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* @return \PicoFeed\Client\Client
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*/
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public function setUsername($username)
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{
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$this->username = $username ?: $this->username;
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return $this;
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}
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/**
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* Set the password
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*
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* @access public
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* @param string $password Basic Auth Password
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* @return \PicoFeed\Client\Client
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*/
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public function setPassword($password)
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{
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$this->password = $password ?: $this->password;
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return $this;
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}
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/**
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* Set config object
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*
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* @access public
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* @param \PicoFeed\Config\Config $config Config instance
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* @return \PicoFeed\Client\Client
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*/
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public function setConfig($config)
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{
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if ($config !== null) {
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$this->setTimeout($config->getGrabberTimeout());
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$this->setUserAgent($config->getGrabberUserAgent());
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$this->setMaxRedirections($config->getMaxRedirections());
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$this->setMaxBodySize($config->getMaxBodySize());
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$this->setProxyHostname($config->getProxyHostname());
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$this->setProxyPort($config->getProxyPort());
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$this->setProxyUsername($config->getProxyUsername());
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$this->setProxyPassword($config->getProxyPassword());
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}
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return $this;
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}
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}
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