<?php
/*
* Copyright 2013 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Http Streams based implementation of Google_IO.
*
* @author Stuart Langley <[email protected]>
*/
require_once 'Google_CacheParser.php';
class Google_HttpStreamIO extends Google_IO {
private static $ENTITY_HTTP_METHODS = array("POST" => null, "PUT" => null);
private static $DEFAULT_HTTP_CONTEXT = array(
"follow_location" => 0,
"ignore_errors" => 1,
);
private static $DEFAULT_SSL_CONTEXT = array(
"verify_peer" => true,
);
/**
* Perform an authenticated / signed apiHttpRequest.
* This function takes the apiHttpRequest, calls apiAuth->sign on it
* (which can modify the request in what ever way fits the auth mechanism)
* and then calls Google_HttpStreamIO::makeRequest on the signed request
*
* @param Google_HttpRequest $request
* @return Google_HttpRequest The resulting HTTP response including the
* responseHttpCode, responseHeaders and responseBody.
*/
public function authenticatedRequest(Google_HttpRequest $request) {
$request = Google_Client::$auth->sign($request);
return $this->makeRequest($request);
}
/**
* Execute a apiHttpRequest
*
* @param Google_HttpRequest $request the http request to be executed
* @return Google_HttpRequest http request with the response http code,
* response headers and response body filled in
* @throws Google_IOException on curl or IO error
*/
public function makeRequest(Google_HttpRequest $request) {
// First, check to see if we have a valid cached version.
$cached = $this->getCachedRequest($request);
if ($cached !== false) {
if (!$this->checkMustRevaliadateCachedRequest($cached, $request)) {
return $cached;
}
}
$default_options = stream_context_get_options(stream_context_get_default());
$requestHttpContext = array_key_exists('http', $default_options) ?
$default_options['http'] : array();
if (array_key_exists($request->getRequestMethod(),
self::$ENTITY_HTTP_METHODS)) {
$request = $this->processEntityRequest($request);
}
if ($request->getPostBody()) {
$requestHttpContext["content"] = $request->getPostBody();
}
$requestHeaders = $request->getRequestHeaders();
if ($requestHeaders && is_array($requestHeaders)) {
$headers = "";
foreach($requestHeaders as $k => $v) {
$headers .= "$k: $v\n";
}
$requestHttpContext["header"] = $headers;
}
$requestHttpContext["method"] = $request->getRequestMethod();
$requestHttpContext["user_agent"] = $request->getUserAgent();
$requestSslContext = array_key_exists('ssl', $default_options) ?
$default_options['ssl'] : array();
if (!array_key_exists("cafile", $requestSslContext)) {
$requestSslContext["cafile"] = dirname(__FILE__) . '/cacerts.pem';
}
$options = array("http" => array_merge(self::$DEFAULT_HTTP_CONTEXT,
$requestHttpContext),
"ssl" => array_merge(self::$DEFAULT_SSL_CONTEXT,
$requestSslContext));
$context = stream_context_create($options);
$response_data = file_get_contents($request->getUrl(),
false,
$context);
if (false === $response_data) {
throw new Google_IOException("HTTP Error: Unable to connect");
}
$respHttpCode = $this->getHttpResponseCode($http_response_header);
$responseHeaders = $this->getHttpResponseHeaders($http_response_header);
if ($respHttpCode == 304 && $cached) {
// If the server responded NOT_MODIFIED, return the cached request.
$this->updateCachedRequest($cached, $responseHeaders);
return $cached;
}
$request->setResponseHttpCode($respHttpCode);
$request->setResponseHeaders($responseHeaders);
$request->setResponseBody($response_data);
// Store the request in cache (the function checks to see if the request
// can actually be cached)
$this->setCachedRequest($request);
return $request;
}
/**
* Set options that update the transport implementation's behavior.
* @param $options
*/
public function setOptions($options) {
}
private function getHttpResponseCode($response_headers) {
$header_count = count($response_headers);
for ($i = 0; $i < $header_count; $i++) {
$header = $response_headers[$i];
if (strncasecmp("HTTP", $header, strlen("HTTP")) == 0) {
$response = explode(' ', $header);
return $response[1];
}
}
return 'UNKNOWN';
}
private function getHttpResponseHeaders($response_headers) {
$header_count = count($response_headers);
$headers = array();
for ($i = 0; $i < $header_count; $i++) {
$header = $response_headers[$i];
$header_parts = explode(':', $header);
if (count($header_parts) == 2) {
$headers[$header_parts[0]] = $header_parts[1];
}
}
return $headers;
}
}
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