miniflux-legacy/vendor/fguillot/picofeed/lib/PicoFeed/Client/Client.php

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