328 lines
10 KiB
PHP
328 lines
10 KiB
PHP
<?php
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/*
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* Copyright 2013 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Abstract IO base class
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*/
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abstract class W3TCG_Google_IO_Abstract
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{
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const UNKNOWN_CODE = 0;
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const FORM_URLENCODED = 'application/x-www-form-urlencoded';
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private static $CONNECTION_ESTABLISHED_HEADERS = array(
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"HTTP/1.0 200 Connection established\r\n\r\n",
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"HTTP/1.1 200 Connection established\r\n\r\n",
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);
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private static $ENTITY_HTTP_METHODS = array("POST" => null, "PUT" => null);
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/** @var W3TCG_Google_Client */
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protected $client;
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public function __construct(W3TCG_Google_Client $client)
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{
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$this->client = $client;
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$timeout = $client->getClassConfig('W3TCG_Google_IO_Abstract', 'request_timeout_seconds');
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if ($timeout > 0) {
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$this->setTimeout($timeout);
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}
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}
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/**
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* Executes a W3TCG_Google_Http_Request and returns the resulting populated W3TCG_Google_Http_Request
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* @param W3TCG_Google_Http_Request $request
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* @return W3TCG_Google_Http_Request $request
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*/
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abstract public function executeRequest(W3TCG_Google_Http_Request $request);
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/**
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* Set options that update the transport implementation's behavior.
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* @param $options
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*/
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abstract public function setOptions($options);
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/**
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* Set the maximum request time in seconds.
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* @param $timeout in seconds
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*/
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abstract public function setTimeout($timeout);
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/**
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* Get the maximum request time in seconds.
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* @return timeout in seconds
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*/
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abstract public function getTimeout();
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/**
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* Test for the presence of a cURL header processing bug
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*
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* The cURL bug was present in versions prior to 7.30.0 and caused the header
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* length to be miscalculated when a "Connection established" header added by
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* some proxies was present.
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*
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* @return boolean
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*/
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abstract protected function needsQuirk();
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/**
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* @visible for testing.
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* Cache the response to an HTTP request if it is cacheable.
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* @param W3TCG_Google_Http_Request $request
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* @return bool Returns true if the insertion was successful.
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* Otherwise, return false.
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*/
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public function setCachedRequest(W3TCG_Google_Http_Request $request)
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{
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// Determine if the request is cacheable.
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if (W3TCG_Google_Http_CacheParser::isResponseCacheable($request)) {
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$this->client->getCache()->set($request->getCacheKey(), $request);
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return true;
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}
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return false;
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}
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/**
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* Execute an HTTP Request
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*
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* @param W3TCG_Google_HttpRequest $request the http request to be executed
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* @return W3TCG_Google_HttpRequest http request with the response http code,
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* response headers and response body filled in
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* @throws W3TCG_Google_IO_Exception on curl or IO error
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*/
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public function makeRequest(W3TCG_Google_Http_Request $request)
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{
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// First, check to see if we have a valid cached version.
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$cached = $this->getCachedRequest($request);
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if ($cached !== false && $cached instanceof W3TCG_Google_Http_Request) {
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if (!$this->checkMustRevalidateCachedRequest($cached, $request)) {
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return $cached;
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}
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}
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if (array_key_exists($request->getRequestMethod(), self::$ENTITY_HTTP_METHODS)) {
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$request = $this->processEntityRequest($request);
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}
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list($responseData, $responseHeaders, $respHttpCode) = $this->executeRequest($request);
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if ($respHttpCode == 304 && $cached) {
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// If the server responded NOT_MODIFIED, return the cached request.
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$this->updateCachedRequest($cached, $responseHeaders);
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return $cached;
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}
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if (!isset($responseHeaders['Date']) && !isset($responseHeaders['date'])) {
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$responseHeaders['Date'] = date("r");
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}
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$request->setResponseHttpCode($respHttpCode);
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$request->setResponseHeaders($responseHeaders);
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$request->setResponseBody($responseData);
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// Store the request in cache (the function checks to see if the request
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// can actually be cached)
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$this->setCachedRequest($request);
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return $request;
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}
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/**
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* @visible for testing.
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* @param W3TCG_Google_Http_Request $request
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* @return W3TCG_Google_Http_Request|bool Returns the cached object or
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* false if the operation was unsuccessful.
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*/
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public function getCachedRequest(W3TCG_Google_Http_Request $request)
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{
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if (false === W3TCG_Google_Http_CacheParser::isRequestCacheable($request)) {
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return false;
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}
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return $this->client->getCache()->get($request->getCacheKey());
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}
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/**
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* @visible for testing
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* Process an http request that contains an enclosed entity.
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* @param W3TCG_Google_Http_Request $request
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* @return W3TCG_Google_Http_Request Processed request with the enclosed entity.
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*/
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public function processEntityRequest(W3TCG_Google_Http_Request $request)
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{
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$postBody = $request->getPostBody();
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$contentType = $request->getRequestHeader("content-type");
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// Set the default content-type as application/x-www-form-urlencoded.
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if (false == $contentType) {
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$contentType = self::FORM_URLENCODED;
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$request->setRequestHeaders(array('content-type' => $contentType));
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}
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// Force the payload to match the content-type asserted in the header.
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if ($contentType == self::FORM_URLENCODED && is_array($postBody)) {
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$postBody = http_build_query($postBody, '', '&');
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$request->setPostBody($postBody);
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}
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// Make sure the content-length header is set.
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if (!$postBody || is_string($postBody)) {
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$postsLength = strlen($postBody);
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$request->setRequestHeaders(array('content-length' => $postsLength));
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}
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return $request;
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}
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/**
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* Check if an already cached request must be revalidated, and if so update
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* the request with the correct ETag headers.
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* @param W3TCG_Google_Http_Request $cached A previously cached response.
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* @param W3TCG_Google_Http_Request $request The outbound request.
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* return bool If the cached object needs to be revalidated, false if it is
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* still current and can be re-used.
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*/
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protected function checkMustRevalidateCachedRequest($cached, $request)
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{
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if (W3TCG_Google_Http_CacheParser::mustRevalidate($cached)) {
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$addHeaders = array();
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if ($cached->getResponseHeader('etag')) {
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// [13.3.4] If an entity tag has been provided by the origin server,
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// we must use that entity tag in any cache-conditional request.
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$addHeaders['If-None-Match'] = $cached->getResponseHeader('etag');
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} elseif ($cached->getResponseHeader('date')) {
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$addHeaders['If-Modified-Since'] = $cached->getResponseHeader('date');
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}
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$request->setRequestHeaders($addHeaders);
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return true;
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} else {
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return false;
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}
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}
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/**
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* Update a cached request, using the headers from the last response.
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* @param W3TCG_Google_HttpRequest $cached A previously cached response.
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* @param mixed Associative array of response headers from the last request.
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*/
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protected function updateCachedRequest($cached, $responseHeaders)
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{
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if (isset($responseHeaders['connection'])) {
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$hopByHop = array_merge(
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self::$HOP_BY_HOP,
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explode(
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',',
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$responseHeaders['connection']
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)
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);
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$endToEnd = array();
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foreach ($hopByHop as $key) {
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if (isset($responseHeaders[$key])) {
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$endToEnd[$key] = $responseHeaders[$key];
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}
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}
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$cached->setResponseHeaders($endToEnd);
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}
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}
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/**
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* Used by the IO lib and also the batch processing.
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*
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* @param $respData
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* @param $headerSize
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* @return array
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*/
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public function parseHttpResponse($respData, $headerSize)
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{
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// check proxy header
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foreach (self::$CONNECTION_ESTABLISHED_HEADERS as $established_header) {
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if (stripos($respData, $established_header) !== false) {
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// existed, remove it
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$respData = str_ireplace($established_header, '', $respData);
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// Subtract the proxy header size unless the cURL bug prior to 7.30.0
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// is present which prevented the proxy header size from being taken into
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// account.
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if (!$this->needsQuirk()) {
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$headerSize -= strlen($established_header);
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}
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break;
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}
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}
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if ($headerSize) {
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$responseBody = substr($respData, $headerSize);
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$responseHeaders = substr($respData, 0, $headerSize);
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} else {
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$responseSegments = explode("\r\n\r\n", $respData, 2);
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$responseHeaders = $responseSegments[0];
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$responseBody = isset($responseSegments[1]) ? $responseSegments[1] :
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null;
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}
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$responseHeaders = $this->getHttpResponseHeaders($responseHeaders);
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return array($responseHeaders, $responseBody);
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}
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/**
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* Parse out headers from raw headers
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* @param rawHeaders array or string
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* @return array
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*/
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public function getHttpResponseHeaders($rawHeaders)
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{
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if (is_array($rawHeaders)) {
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return $this->parseArrayHeaders($rawHeaders);
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} else {
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return $this->parseStringHeaders($rawHeaders);
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}
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}
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private function parseStringHeaders($rawHeaders)
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{
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$headers = array();
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$responseHeaderLines = explode("\r\n", $rawHeaders);
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foreach ($responseHeaderLines as $headerLine) {
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if ($headerLine && strpos($headerLine, ':') !== false) {
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list($header, $value) = explode(': ', $headerLine, 2);
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$header = strtolower($header);
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if (isset($headers[$header])) {
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$headers[$header] .= "\n" . $value;
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} else {
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$headers[$header] = $value;
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}
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}
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}
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return $headers;
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}
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private function parseArrayHeaders($rawHeaders)
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{
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$header_count = count($rawHeaders);
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$headers = array();
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for ($i = 0; $i < $header_count; $i++) {
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$header = $rawHeaders[$i];
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// Times will have colons in - so we just want the first match.
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$header_parts = explode(': ', $header, 2);
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if (count($header_parts) == 2) {
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$headers[$header_parts[0]] = $header_parts[1];
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}
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}
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return $headers;
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}
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}
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