miniflux-legacy/vendor/PicoFeed/Client.php

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<?php
namespace PicoFeed;
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use LogicException;
use Clients\Curl;
use Clients\Stream;
/**
* 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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/**
* Flag that say if the resource is a 404
*
* @access private
* @var bool
*/
private $is_not_found = false;
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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 = '';
/**
* 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
/**
* Get client instance: curl or stream driver
*
* @static
* @access public
* @return \PicoFeed\Client
*/
public static function getInstance()
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{
if (function_exists('curl_init')) {
require_once __DIR__.'/Clients/Curl.php';
return new Clients\Curl;
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}
else if (ini_get('allow_url_fopen')) {
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require_once __DIR__.'/Clients/Stream.php';
return new Clients\Stream;
}
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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 $url URL
* @return bool
*/
public function execute($url = '')
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{
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if ($url !== '') {
$this->url = $url;
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}
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Logging::setMessage(get_called_class().' Fetch URL: '.$this->url);
Logging::setMessage(get_called_class().' Etag provided: '.$this->etag);
Logging::setMessage(get_called_class().' Last-Modified provided: '.$this->last_modified);
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$response = $this->doRequest();
if (is_array($response)) {
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$this->handleNotModifiedResponse($response);
$this->handleNotFoundResponse($response);
$this->handleNormalResponse($response);
return true;
}
return false;
}
/**
* 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) {
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$etag = $this->getHeader($response, 'ETag');
$last_modified = $this->getHeader($response, 'Last-Modified');
if ($this->isPropertyEquals('etag', $etag) || $this->isPropertyEquals('last_modified', $last_modified)) {
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$this->is_modified = false;
}
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$this->etag = $etag;
$this->last_modified = $last_modified;
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}
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if ($this->is_modified === false) {
Logging::setMessage(get_called_class().' Resource not modified');
}
}
/**
* Handle not found response
*
* @access public
* @param array $response Client response
*/
public function handleNotFoundResponse(array $response)
{
if ($response['status'] == 404) {
$this->is_not_found = true;
Logging::setMessage(get_called_class().' Resource not found');
}
}
/**
* Handle normal response
*
* @access public
* @param array $response Client response
*/
public function handleNormalResponse(array $response)
{
if ($response['status'] == 200) {
$this->content = $response['body'];
$this->encoding = $this->findCharset($response);
}
}
/**
* Check if a class property equals to a value
*
* @access public
* @param string $property Class property
* @param string $value Value
* @return boolean
*/
private function isPropertyEquals($property, $value)
{
return $this->$property && $this->$property === $value;
}
/**
* Find charset from response headers
*
* @access public
* @param array $response Client response
*/
public function findCharset(array $response)
{
$result = explode('charset=', strtolower($this->getHeader($response, 'Content-Type')));
return isset($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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/**
* Parse HTTP headers
*
* @access public
* @param array $lines List of headers
* @return array
*/
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public function parseHeaders(array $lines)
{
$status = 200;
$headers = array();
foreach ($lines as $line) {
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if (strpos($line, 'HTTP') === 0) {
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$status = (int) substr($line, 9, 3);
}
else if (strpos($line, ':') !== false) {
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@list($name, $value) = explode(': ', $line);
if ($value) $headers[trim($name)] = trim($value);
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}
}
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Logging::setMessage(get_called_class().' HTTP status code: '.$status);
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foreach ($headers as $name => $value) {
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Logging::setMessage(get_called_class().' HTTP header: '.$name.' => '.$value);
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}
return array($status, $headers);
}
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/**
* Set the Last-Modified HTTP header
*
* @access public
* @param string $last_modified Header value
* @return \PicoFeed\Client
*/
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public function setLastModified($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 $etag Etag HTTP header value
* @return \PicoFeed\Client
*/
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public function setEtag($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 $this->url;
}
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/**
* Set the url
*
* @access public
* @return string
* @return \PicoFeed\Client
*/
public function setUrl($url)
{
$this->url = $url;
return $this;
}
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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 encoding value from HTTP headers
*
* @access public
* @return string
*/
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public function getEncoding()
{
return $this->encoding;
}
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/**
* Return true if the remote resource has changed
*
* @access public
* @return bool
*/
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public function isModified()
{
return $this->is_modified;
}
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/**
* Return true if the remote resource is not found
*
* @access public
* @return bool
*/
public function isNotFound()
{
return $this->is_not_found;
}
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/**
* Set connection timeout
*
* @access public
* @param integer $timeout Connection timeout
* @return \PicoFeed\Client
*/
public function setTimeout($timeout)
{
$this->timeout = $timeout ?: $this->timeout;
return $this;
}
/**
* Set a custom user agent
*
* @access public
* @param string $user_agent User Agent
* @return \PicoFeed\Client
*/
public function setUserAgent($user_agent)
{
$this->user_agent = $user_agent ?: $this->user_agent;
return $this;
}
/**
* Set the mximum number of HTTP redirections
*
* @access public
* @param integer $max Maximum
* @return \PicoFeed\Client
*/
public function setMaxRedirections($max)
{
$this->max_redirects = $max ?: $this->max_redirects;
return $this;
}
/**
* Set the maximum size of the HTTP body
*
* @access public
* @param integer $max Maximum
* @return \PicoFeed\Client
*/
public function setMaxBodySize($max)
{
$this->max_body_size = $max ?: $this->max_body_size;
return $this;
}
/**
* Set the proxy hostname
*
* @access public
* @param string $hostname Proxy hostname
* @return \PicoFeed\Client
*/
public function setProxyHostname($hostname)
{
$this->proxy_hostname = $hostname ?: $this->proxy_hostname;
return $this;
}
/**
* Set the proxy port
*
* @access public
* @param integer $port Proxy port
* @return \PicoFeed\Client
*/
public function setProxyPort($port)
{
$this->proxy_port = $port ?: $this->proxy_port;
return $this;
}
/**
* Set the proxy username
*
* @access public
* @param string $username Proxy username
* @return \PicoFeed\Client
*/
public function setProxyUsername($username)
{
$this->proxy_username = $username ?: $this->proxy_username;
return $this;
}
/**
* Set the proxy password
*
* @access public
* @param string $password Password
* @return \PicoFeed\Client
*/
public function setProxyPassword($password)
{
$this->proxy_password = $password ?: $this->proxy_password;
return $this;
}
/**
* Set config object
*
* @access public
* @param \PicoFeed\Config $config Config instance
* @return \PicoFeed\Client
*/
public function setConfig($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;
}
}