713 lines
15 KiB
PHP
713 lines
15 KiB
PHP
<?php
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namespace PicoFeed\Client;
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use DateTime;
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use LogicException;
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use PicoFeed\Logging\Logger;
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use PicoFeed\Config\Config;
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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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*/
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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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* @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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* @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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* @var string
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*/
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private $encoding = '';
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/**
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* HTTP request headers.
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*
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* @var array
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*/
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protected $request_headers = array();
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/**
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* HTTP Etag header.
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*
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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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* @var string
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*/
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protected $last_modified = '';
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/**
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* Expiration DateTime
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*
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* @var DateTime
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*/
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protected $expiration = null;
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/**
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* Proxy hostname.
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*
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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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* @var int
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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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* @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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* @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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* @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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* @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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* @var int
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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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* @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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* @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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* @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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* @var int
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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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* @var int
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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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* @var int
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*/
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protected $status_code = 0;
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/**
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* Enables direct passthrough to requesting client.
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*
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* @var bool
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*/
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protected $passthrough = false;
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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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*
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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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*
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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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} elseif (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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* Add HTTP Header to the request.
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*
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* @param array $headers
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*/
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public function setHeaders($headers)
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{
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$this->request_headers = $headers;
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}
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/**
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* Perform the HTTP request.
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*
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* @param string $url URL
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*
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* @return Client
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*/
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public function execute($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->handleErrorResponse($response);
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$this->handleNormalResponse($response);
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$this->expiration = $this->parseExpiration($response['headers']);
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Logger::setMessage(get_called_class().' Expiration: '.$this->expiration->format(DATE_ISO8601));
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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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* @param array $response Client response
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*/
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protected function handleNotModifiedResponse(array $response)
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{
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if ($response['status'] == 304) {
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$this->is_modified = false;
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} elseif ($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 Http Error codes
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*
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* @param array $response Client response
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* @throws ForbiddenException
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* @throws InvalidUrlException
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* @throws UnauthorizedException
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*/
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protected function handleErrorResponse(array $response)
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{
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$status = $response['status'];
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if ($status == 401) {
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throw new UnauthorizedException('Wrong or missing credentials');
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} else if ($status == 403) {
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throw new ForbiddenException('Not allowed to access resource');
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} else if ($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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* @param array $response Client response
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*/
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protected 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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* @param array $response
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* @param string $etag
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* @param string $lastModified
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*
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* @return bool
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*/
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private function hasBeenModified($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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* @param array $response Client response
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*
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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($response, 'Content-Type'));
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}
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/**
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* Find charset from response headers.
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*
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* @return string
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*/
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public function findCharset()
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{
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$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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* @param array $response Client response
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* @param string $header Header name
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*
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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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* @param string $last_modified Header value
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setLastModified($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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* @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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* @param string $etag Etag HTTP header value
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setEtag($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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* @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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* @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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* @param $url
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* @return string
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*/
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public function setUrl($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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* @return int
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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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* @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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* @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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* @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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* @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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* return true if passthrough mode is enabled.
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*
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* @return bool
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*/
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public function isPassthroughEnabled()
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{
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return $this->passthrough;
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}
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/**
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* Set connection timeout.
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*
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* @param int $timeout Connection timeout
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setTimeout($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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* @param string $user_agent User Agent
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setUserAgent($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 maximum number of HTTP redirections.
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*
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* @param int $max Maximum
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setMaxRedirections($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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* @param int $max Maximum
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setMaxBodySize($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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* @param string $hostname Proxy hostname
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyHostname($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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* @param int $port Proxy port
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyPort($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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* @param string $username Proxy username
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyUsername($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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* @param string $password Password
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setProxyPassword($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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* @param string $username Basic Auth username
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setUsername($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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* @param string $password Basic Auth Password
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setPassword($password)
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{
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$this->password = $password ?: $this->password;
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return $this;
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}
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/**
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* Enable the passthrough mode.
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*
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* @return \PicoFeed\Client\Client
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*/
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public function enablePassthroughMode()
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{
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$this->passthrough = true;
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return $this;
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}
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/**
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* Disable the passthrough mode.
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*
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* @return \PicoFeed\Client\Client
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*/
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public function disablePassthroughMode()
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{
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$this->passthrough = false;
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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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* @param \PicoFeed\Config\Config $config Config instance
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*
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* @return \PicoFeed\Client\Client
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*/
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public function setConfig(Config $config)
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{
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if ($config !== null) {
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$this->setTimeout($config->getClientTimeout());
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$this->setUserAgent($config->getClientUserAgent());
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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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|
* Return true if the HTTP status code is a redirection
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|
*
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|
* @access protected
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|
* @param integer $code
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|
* @return boolean
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|
*/
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|
public function isRedirection($code)
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|
{
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|
return $code == 301 || $code == 302 || $code == 303 || $code == 307;
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|
}
|
|
|
|
public function parseExpiration(HttpHeaders $headers)
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|
{
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|
if (isset($headers['Cache-Control'])) {
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|
if (preg_match('/s-maxage=(\d+)/', $headers['Cache-Control'], $matches)) {
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|
return new DateTime('+' . $matches[1] . ' seconds');
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|
} else if (preg_match('/max-age=(\d+)/', $headers['Cache-Control'], $matches)) {
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|
return new DateTime('+' . $matches[1] . ' seconds');
|
|
}
|
|
}
|
|
|
|
if (! empty($headers['Expires'])) {
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|
return new DateTime($headers['Expires']);
|
|
}
|
|
|
|
return new DateTime();
|
|
}
|
|
|
|
/**
|
|
* Get expiration date time from "Expires" or "Cache-Control" headers
|
|
*
|
|
* @return DateTime
|
|
*/
|
|
public function getExpiration()
|
|
{
|
|
return $this->expiration ?: new DateTime();
|
|
}
|
|
}
|