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<?php |
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/** |
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* Copyright 2010 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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require_once GA_API_Path. 'io/Google_HttpRequest.php'; |
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require_once GA_API_Path. 'io/Google_HttpStreamIO.php'; |
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require_once GA_API_Path. 'io/Google_CurlIO.php'; |
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require_once GA_API_Path. 'io/Google_REST.php'; |
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/** |
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* Abstract IO class |
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* |
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* @author Chris Chabot <[email protected]> |
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*/ |
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abstract class Google_IO { |
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const CONNECTION_ESTABLISHED = "HTTP/1.0 200 Connection established\r\n\r\n"; |
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const FORM_URLENCODED = 'application/x-www-form-urlencoded'; |
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/** |
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* An utility function that first calls $this->auth->sign($request) and then executes makeRequest() |
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* on that signed request. Used for when a request should be authenticated |
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* @param Google_HttpRequest $request |
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* @return Google_HttpRequest $request |
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*/ |
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abstract function authenticatedRequest(Google_HttpRequest $request); |
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/** |
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* Executes a apIHttpRequest and returns the resulting populated httpRequest |
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* @param Google_HttpRequest $request |
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* @return Google_HttpRequest $request |
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*/ |
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abstract function makeRequest(Google_HttpRequest $request); |
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/** |
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* Set options that update the transport implementation's behavior. |
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* @param $options |
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*/ |
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abstract function setOptions($options); |
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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 Google_HttpRequest $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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View Code Duplication |
protected function setCachedRequest(Google_HttpRequest $request) { |
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// Determine if the request is cacheable. |
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if (Google_CacheParser::isResponseCacheable($request)) { |
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Google_Client::$cache->set($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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* @visible for testing. |
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* @param Google_HttpRequest $request |
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* @return Google_HttpRequest|bool Returns the cached object or |
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* false if the operation was unsuccessful. |
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*/ |
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View Code Duplication |
protected function getCachedRequest(Google_HttpRequest $request) { |
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if (false == Google_CacheParser::isRequestCacheable($request)) { |
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false; |
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} |
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return Google_Client::$cache->get($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 Google_HttpRequest $request |
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* @return Google_HttpRequest Processed request with the enclosed entity. |
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*/ |
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protected function processEntityRequest(Google_HttpRequest $request) { |
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$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 Google_HttpRequest $cached A previously cached response. |
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* @param Google_HttpRequest $request The outbound request. |
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* return bool If the cached object needs to be revalidated, false if it is |
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* still current and can be re-used. |
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*/ |
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protected function checkMustRevaliadateCachedRequest($cached, $request) { |
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if (Google_CacheParser::mustRevalidate($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 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, $responseHeaders) { |
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if (isset($responseHeaders['connection'])) { |
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$hopByHop = array_merge( |
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self::$HOP_BY_HOP, |
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explode(',', $responseHeaders['connection']) |
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); |
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$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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Adding explicit visibility (
private
,protected
, orpublic
) is generally recommend to communicate to other developers how, and from where this method is intended to be used.