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<?php
namespace p3k;
class HTTPStream {
public $timeout = 4;
public $max_redirects = 8;
public static function exception_error_handler($severity, $message, $file, $line) {
if (!(error_reporting() & $severity)) {
// This error code is not included in error_reporting
return;
}
throw new \ErrorException($message, 0, $severity, $file, $line);
}
public function get($url, $headers=[]) {
set_error_handler("p3k\HTTPStream::exception_error_handler");
$context = $this->_stream_context('GET', $url, false, $headers);
return $this->_fetch($url, $context);
}
public function post($url, $body, $headers=[]) {
set_error_handler("p3k\HTTPStream::exception_error_handler");
$context = $this->_stream_context('POST', $url, $body, $headers);
return $this->_fetch($url, $context);
}
public function head($url) {
set_error_handler("p3k\HTTPStream::exception_error_handler");
$context = $this->_stream_context('HEAD', $url);
return $this->_fetch($url, $context);
}
private function _fetch($url, $context) {
$error = false;
try {
$body = file_get_contents($url, false, $context);
// This sets $http_response_header
// see http://php.net/manual/en/reserved.variables.httpresponseheader.php
} catch(\Exception $e) {
$body = false;
$http_response_header = [];
$description = str_replace('file_get_contents(): ', '', $e->getMessage());
$code = 'unknown';
if(preg_match('/getaddrinfo failed/', $description)) {
$code = 'dns_error';
$description = str_replace('php_network_getaddresses: ', '', $description);
}
if(preg_match('/timed out|request failed/', $description)) {
$code = 'timeout';
}
if(preg_match('/certificate/', $description)) {
$code = 'ssl_error';
}
$error = [
'description' => $description,
'code' => $code
];
}
return array(
'code' => self::parse_response_code($http_response_header),
'headers' => self::parse_headers($http_response_header),
'body' => $body,
'error' => $error ? $error['code'] : false,
'error_description' => $error ? $error['description'] : false,
'url' => $url,
);
}
private function _stream_context($method, $url, $body=false, $headers=[]) {
$options = [
'method' => $method,
'timeout' => $this->timeout,
'ignore_errors' => true,
];
if($body) {
$options['content'] = $body;
}
if($headers) {
$options['header'] = implode("\r\n", $headers);
}
// Special-case appspot.com URLs to not follow redirects.
// https://cloud.google.com/appengine/docs/php/urlfetch/
if(should_follow_redirects($url)) {
$options['follow_location'] = 1;
$options['max_redirects'] = $this->max_redirects;
} else {
$options['follow_location'] = 0;
}
return stream_context_create(['http' => $options]);
}
public static function parse_response_code($headers) {
// When a response is a redirect, we want to find the last occurrence of the HTTP code
$code = false;
foreach($headers as $field) {
if(preg_match('/HTTP\/\d\.\d (\d+)/', $field, $match)) {
$code = $match[1];
}
}
return $code;
}
public static function parse_headers($headers) {
$retVal = array();
foreach($headers as $field) {
if(preg_match('/([^:]+): (.+)/m', $field, $match)) {
$match[1] = preg_replace_callback('/(?<=^|[\x09\x20\x2D])./', function($m) {
return strtoupper($m[0]);
}, strtolower(trim($match[1])));
// If there's already a value set for the header name being returned, turn it into an array and add the new value
$match[1] = preg_replace_callback('/(?<=^|[\x09\x20\x2D])./', function($m) {
return strtoupper($m[0]);
}, strtolower(trim($match[1])));
if(isset($retVal[$match[1]])) {
if(!is_array($retVal[$match[1]]))
$retVal[$match[1]] = array($retVal[$match[1]]);
$retVal[$match[1]][] = $match[2];
} else {
$retVal[$match[1]] = trim($match[2]);
}
}
}
return $retVal;
}
}