<?php
/*
* Copyright 2010 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.
*/
/**
* This class implements the RESTful transport of apiServiceRequest()'s
*
* @author Chris Chabot <chabotc@google.com>
* @author Chirag Shah <chirags@google.com>
*/
class Google_REST {
/**
* Executes a apiServiceRequest using a RESTful call by transforming it into
* an apiHttpRequest, and executed via apiIO::authenticatedRequest().
*
* @param Google_HttpRequest $req
* @return array decoded result
* @throws Google_ServiceException on server side error (ie: not authenticated,
* invalid or malformed post body, invalid url)
*/
static public function execute(Google_HttpRequest $req) {
$httpRequest = Google_Client::$io->makeRequest($req);
$decodedResponse = self::decodeHttpResponse($httpRequest);
$ret = isset($decodedResponse['data'])
? $decodedResponse['data'] : $decodedResponse;
return $ret;
}
/**
* Decode an HTTP Response.
* @static
* @throws Google_ServiceException
* @param Google_HttpRequest $response The http response to be decoded.
* @return mixed|null
*/
public static function decodeHttpResponse($response) {
$code = $response->getResponseHttpCode();
$body = $response->getResponseBody();
$decoded = null;
if ((intVal($code)) >= 300) {
$decoded = json_decode($body, true);
$err = 'Error calling ' . $response->getRequestMethod() . ' ' . $response->getUrl();
if ($decoded != null && isset($decoded['error']['message']) && isset($decoded['error']['code'])) {
// if we're getting a json encoded error definition, use that instead of the raw response
// body for improved readability
$err .= ": ({$decoded['error']['code']}) {$decoded['error']['message']}";
} else {
$err .= ": ($code) $body";
}
throw new Google_ServiceException($err, $code, null, $decoded['error']['errors']);
}
// Only attempt to decode the response, if the response code wasn't (204) 'no content'
if ($code != '204') {
$decoded = json_decode($body, true);
if ($decoded === null || $decoded === "") {
throw new Google_ServiceException("Invalid json in service response: $body");
}
}
return $decoded;
}
/**
* Parse/expand request parameters and create a fully qualified
* request uri.
* @static
* @param string $servicePath
* @param string $restPath
* @param array $params
* @return string $requestUrl
*/
static function createRequestUri($servicePath, $restPath, $params) {
$requestUrl = $servicePath . $restPath;
$uriTemplateVars = array();
$queryVars = array();
foreach ($params as $paramName => $paramSpec) {
// Discovery v1.0 puts the canonical location under the 'location' field.
if (! isset($paramSpec['location'])) {
$paramSpec['location'] = $paramSpec['restParameterType'];
}
if ($paramSpec['type'] == 'boolean') {
$paramSpec['value'] = ($paramSpec['value']) ? 'true' : 'false';
}
if ($paramSpec['location'] == 'path') {
$uriTemplateVars[$paramName] = $paramSpec['value'];
} else {
if (isset($paramSpec['repeated']) && is_array($paramSpec['value'])) {
foreach ($paramSpec['value'] as $value) {
$queryVars[] = $paramName . '=' . rawurlencode($value);
}
} else {
$queryVars[] = $paramName . '=' . rawurlencode($paramSpec['value']);
}
}
}
if (count($uriTemplateVars)) {
$uriTemplateParser = new URI_Template_Parser($requestUrl);
$requestUrl = $uriTemplateParser->expand($uriTemplateVars);
}
//FIXME work around for the the uri template lib which url encodes
// the @'s & confuses our servers.
$requestUrl = str_replace('%40', '@', $requestUrl);
if (count($queryVars)) {
$requestUrl .= '?' . implode($queryVars, '&');
}
return $requestUrl;
}
}
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