344 lines
9.8 KiB
PHP
344 lines
9.8 KiB
PHP
<?php
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namespace PicoFeed\Client;
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use PicoFeed\Logging\Logger;
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/**
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* cURL HTTP client
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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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class Curl extends Client
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{
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/**
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* HTTP response body
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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 $body = '';
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/**
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* Body size
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*
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* @access private
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* @var integer
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*/
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private $body_length = 0;
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/**
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* HTTP response headers
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*
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* @access private
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* @var array
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*/
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private $headers = array();
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/**
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* Counter on the number of header received
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*
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* @access private
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* @var integer
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*/
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private $headers_counter = 0;
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/**
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* cURL callback to read the HTTP body
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*
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* If the function return -1, curl stop to read the HTTP response
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*
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* @access public
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* @param resource $ch cURL handler
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* @param string $buffer Chunk of data
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* @return integer Length of the buffer
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*/
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public function readBody($ch, $buffer)
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{
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$length = strlen($buffer);
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$this->body_length += $length;
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if ($this->body_length > $this->max_body_size) {
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return -1;
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}
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$this->body .= $buffer;
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return $length;
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}
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/**
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* cURL callback to read HTTP headers
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*
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* @access public
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* @param resource $ch cURL handler
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* @param string $buffer Header line
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* @return integer Length of the buffer
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*/
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public function readHeaders($ch, $buffer)
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{
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$length = strlen($buffer);
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if ($buffer === "\r\n") {
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$this->headers_counter++;
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}
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else {
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if (! isset($this->headers[$this->headers_counter])) {
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$this->headers[$this->headers_counter] = '';
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}
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$this->headers[$this->headers_counter] .= $buffer;
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}
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return $length;
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}
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/**
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* Prepare HTTP headers
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*
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* @access private
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* @return string[]
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*/
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private function prepareHeaders()
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{
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$headers = array(
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'Connection: close',
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'User-Agent: '.$this->user_agent,
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);
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if ($this->etag) {
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$headers[] = 'If-None-Match: '.$this->etag;
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}
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if ($this->last_modified) {
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$headers[] = 'If-Modified-Since: '.$this->last_modified;
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}
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return $headers;
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}
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/**
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* Prepare curl proxy context
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*
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* @access private
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* @return resource $ch
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*/
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private function prepareProxyContext($ch)
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{
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if ($this->proxy_hostname) {
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Logger::setMessage(get_called_class().' Proxy: '.$this->proxy_hostname.':'.$this->proxy_port);
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curl_setopt($ch, CURLOPT_PROXYPORT, $this->proxy_port);
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curl_setopt($ch, CURLOPT_PROXYTYPE, 'HTTP');
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curl_setopt($ch, CURLOPT_PROXY, $this->proxy_hostname);
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if ($this->proxy_username) {
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Logger::setMessage(get_called_class().' Proxy credentials: Yes');
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curl_setopt($ch, CURLOPT_PROXYUSERPWD, $this->proxy_username.':'.$this->proxy_password);
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}
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else {
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Logger::setMessage(get_called_class().' Proxy credentials: No');
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}
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}
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return $ch;
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}
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/**
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* Prepare curl auth context
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*
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* @access private
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* @return resource $ch
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*/
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private function prepareAuthContext($ch)
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{
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if ($this->username && $this->password) {
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curl_setopt($ch, CURLOPT_USERPWD, $this->username.':'.$this->password);
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}
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return $ch;
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}
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/**
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* Prepare curl context
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*
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* @access private
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* @return resource
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*/
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private function prepareContext()
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{
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$ch = curl_init();
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curl_setopt($ch, CURLOPT_URL, $this->url);
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curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
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curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->timeout);
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curl_setopt($ch, CURLOPT_HTTPHEADER, $this->prepareHeaders());
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION, ini_get('open_basedir') === '');
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curl_setopt($ch, CURLOPT_MAXREDIRS, $this->max_redirects);
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curl_setopt($ch, CURLOPT_ENCODING, '');
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curl_setopt($ch, CURLOPT_WRITEFUNCTION, array($this, 'readBody'));
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curl_setopt($ch, CURLOPT_HEADERFUNCTION, array($this, 'readHeaders'));
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curl_setopt($ch, CURLOPT_COOKIEJAR, 'php://memory');
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curl_setopt($ch, CURLOPT_COOKIEFILE, 'php://memory');
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$ch = $this->prepareProxyContext($ch);
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$ch = $this->prepareAuthContext($ch);
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return $ch;
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}
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/**
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* Execute curl context
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*
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* @access private
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*/
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private function executeContext()
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{
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$ch = $this->prepareContext();
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curl_exec($ch);
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Logger::setMessage(get_called_class().' cURL total time: '.curl_getinfo($ch, CURLINFO_TOTAL_TIME));
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Logger::setMessage(get_called_class().' cURL dns lookup time: '.curl_getinfo($ch, CURLINFO_NAMELOOKUP_TIME));
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Logger::setMessage(get_called_class().' cURL connect time: '.curl_getinfo($ch, CURLINFO_CONNECT_TIME));
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Logger::setMessage(get_called_class().' cURL speed download: '.curl_getinfo($ch, CURLINFO_SPEED_DOWNLOAD));
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Logger::setMessage(get_called_class().' cURL effective url: '.curl_getinfo($ch, CURLINFO_EFFECTIVE_URL));
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$curl_errno = curl_errno($ch);
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if ($curl_errno) {
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Logger::setMessage(get_called_class().' cURL error: '.curl_error($ch));
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curl_close($ch);
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$this->handleError($curl_errno);
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}
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// Update the url if there where redirects
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$this->url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
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curl_close($ch);
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}
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/**
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* Do the HTTP request
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*
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* @access public
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* @param bool $follow_location Flag used when there is an open_basedir restriction
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* @return array HTTP response ['body' => ..., 'status' => ..., 'headers' => ...]
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*/
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public function doRequest($follow_location = true)
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{
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$this->executeContext();
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list($status, $headers) = $this->parseHeaders(explode("\r\n", $this->headers[$this->headers_counter - 1]));
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// When restricted with open_basedir
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if ($this->needToHandleRedirection($follow_location, $status)) {
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return $this->handleRedirection($headers['Location']);
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}
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return array(
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'status' => $status,
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'body' => $this->body,
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'headers' => $headers
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);
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}
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/**
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* Check if the redirection have to be handled manually
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*
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* @access private
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* @param boolean $follow_location Flag
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* @param integer $status HTTP status code
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* @return boolean
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*/
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private function needToHandleRedirection($follow_location, $status)
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{
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return $follow_location && ini_get('open_basedir') !== '' && ($status == 301 || $status == 302);
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}
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/**
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* Handle manually redirections when there is an open base dir restriction
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*
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* @access private
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* @param string $location Redirected URL
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* @return array
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*/
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private function handleRedirection($location)
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{
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$nb_redirects = 0;
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$result = array();
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$this->url = $location;
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$this->body = '';
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$this->body_length = 0;
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$this->headers = array();
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$this->headers_counter = 0;
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while (true) {
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$nb_redirects++;
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if ($nb_redirects >= $this->max_redirects) {
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throw new MaxRedirectException('Maximum number of redirections reached');
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}
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$result = $this->doRequest(false);
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if ($result['status'] == 301 || $result['status'] == 302) {
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$this->url = $result['headers']['Location'];
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$this->body = '';
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$this->body_length = 0;
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$this->headers = array();
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$this->headers_counter = 0;
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}
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else {
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break;
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}
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}
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return $result;
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}
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/**
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* Handle cURL errors (throw individual exceptions)
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*
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* We don't use constants because they are not necessary always available
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* (depends of the version of libcurl linked to php)
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*
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* @see http://curl.haxx.se/libcurl/c/libcurl-errors.html
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* @access private
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* @param integer $errno cURL error code
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*/
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private function handleError($errno)
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{
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switch ($errno) {
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case 78: // CURLE_REMOTE_FILE_NOT_FOUND
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throw new InvalidUrlException('Resource not found');
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case 6: // CURLE_COULDNT_RESOLVE_HOST
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throw new InvalidUrlException('Unable to resolve hostname');
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case 7: // CURLE_COULDNT_CONNECT
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throw new InvalidUrlException('Unable to connect to the remote host');
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case 28: // CURLE_OPERATION_TIMEDOUT
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throw new TimeoutException('Operation timeout');
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case 35: // CURLE_SSL_CONNECT_ERROR
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case 51: // CURLE_PEER_FAILED_VERIFICATION
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case 58: // CURLE_SSL_CERTPROBLEM
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case 60: // CURLE_SSL_CACERT
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case 59: // CURLE_SSL_CIPHER
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case 64: // CURLE_USE_SSL_FAILED
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case 66: // CURLE_SSL_ENGINE_INITFAILED
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case 77: // CURLE_SSL_CACERT_BADFILE
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case 83: // CURLE_SSL_ISSUER_ERROR
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throw new InvalidCertificateException('Invalid SSL certificate');
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case 47: // CURLE_TOO_MANY_REDIRECTS
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throw new MaxRedirectException('Maximum number of redirections reached');
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case 63: // CURLE_FILESIZE_EXCEEDED
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throw new MaxSizeException('Maximum response size exceeded');
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default:
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throw new InvalidUrlException('Unable to fetch the URL');
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}
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}
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}
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