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137 lines
4.0 KiB
137 lines
4.0 KiB
<?php
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namespace p3k;
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class HTTPStream {
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public $timeout = 4;
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public $max_redirects = 8;
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public static function exception_error_handler($severity, $message, $file, $line) {
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if (!(error_reporting() & $severity)) {
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// This error code is not included in error_reporting
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return;
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}
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throw new \ErrorException($message, 0, $severity, $file, $line);
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}
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public function get($url) {
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set_error_handler("p3k\HTTPStream::exception_error_handler");
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$context = $this->_stream_context('GET', $url);
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return $this->_fetch($url, $context);
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}
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public function post($url, $body, $headers=array()) {
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set_error_handler("p3k\HTTPStream::exception_error_handler");
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$context = $this->_stream_context('POST', $url, $body, $headers);
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return $this->_fetch($url, $context);
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}
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public function head($url) {
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set_error_handler("p3k\HTTPStream::exception_error_handler");
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$context = $this->_stream_context('HEAD', $url);
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return $this->_fetch($url, $context);
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}
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private function _fetch($url, $context) {
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$error = false;
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try {
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$body = file_get_contents($url, false, $context);
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} catch(\Exception $e) {
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$body = false;
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$http_response_header = [];
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$description = str_replace('file_get_contents(): ', '', $e->getMessage());
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$code = 'unknown';
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if(preg_match('/getaddrinfo failed/', $description)) {
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$code = 'dns_error';
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$description = str_replace('php_network_getaddresses: ', '', $description);
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}
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if(preg_match('/timed out|request failed/', $description)) {
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$code = 'timeout';
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}
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if(preg_match('/certificate/', $description)) {
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$code = 'ssl_error';
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}
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$error = [
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'description' => $description,
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'code' => $code
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];
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}
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return array(
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'code' => self::parse_response_code($http_response_header),
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'headers' => self::parse_headers($http_response_header),
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'body' => $body,
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'error' => $error ? $error['code'] : false,
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'error_description' => $error ? $error['description'] : false,
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);
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}
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private function _stream_context($method, $url, $body=false, $headers=[]) {
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$host = parse_url($url, PHP_URL_HOST);
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$options = [
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'method' => $method,
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'timeout' => $this->timeout,
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'ignore_errors' => true,
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];
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if($body) {
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$options['content'] = $body;
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}
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if($headers) {
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$options['header'] = $headers;
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}
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// Special-case appspot.com URLs to not follow redirects.
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// https://cloud.google.com/appengine/docs/php/urlfetch/
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if(substr($host, -12) == '.appspot.com') {
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$options['follow_location'] = 0;
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} else {
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$options['follow_location'] = 1;
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$options['max_redirects'] = $this->max_redirects;
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}
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return stream_context_create(['http' => $options]);
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}
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public static function parse_response_code($headers) {
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// When a response is a redirect, we want to find the last occurrence of the HTTP code
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$code = false;
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foreach($headers as $field) {
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if(preg_match('/HTTP\/\d\.\d (\d+)/', $field, $match)) {
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$code = $match[1];
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}
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}
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return $code;
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}
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public static function parse_headers($headers) {
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$retVal = array();
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foreach($headers as $field) {
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if(preg_match('/([^:]+): (.+)/m', $field, $match)) {
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$match[1] = preg_replace_callback('/(?<=^|[\x09\x20\x2D])./', function($m) {
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return strtoupper($m[0]);
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}, strtolower(trim($match[1])));
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// If there's already a value set for the header name being returned, turn it into an array and add the new value
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$match[1] = preg_replace_callback('/(?<=^|[\x09\x20\x2D])./', function($m) {
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return strtoupper($m[0]);
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}, strtolower(trim($match[1])));
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if(isset($retVal[$match[1]])) {
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if(!is_array($retVal[$match[1]]))
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$retVal[$match[1]] = array($retVal[$match[1]]);
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$retVal[$match[1]][] = $match[2];
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} else {
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$retVal[$match[1]] = trim($match[2]);
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}
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}
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}
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return $retVal;
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}
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}
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