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<?php /* * Copyright 2018, Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ namespace Google\ApiCore; use Google\Protobuf\Internal\GPBUtil; use Google\Protobuf\Internal\Message; use Google\Protobuf\Internal\RepeatedField; use GuzzleHttp\Psr7; use GuzzleHttp\Psr7\Request; use Psr\Http\Message\RequestInterface; use Psr\Http\Message\UriInterface; /** * Builds a PSR-7 request from a set of request information. */ class RequestBuilder { use UriTrait; use ValidationTrait; private $baseUri; private $restConfig; /** * @param string $baseUri * @param string $restConfigPath * @throws ValidationException */ public function __construct($baseUri, $restConfigPath) { self::validateFileExists($restConfigPath); $this->baseUri = $baseUri; $this->restConfig = require($restConfigPath); } /** * @param string $path * @param Message $message * @param array $headers * @return RequestInterface * @throws ValidationException */ public function build($path, Message $message, array $headers = []) { list($interface, $method) = explode('/', $path); if (!isset($this->restConfig['interfaces'][$interface][$method])) { throw new ValidationException( "Failed to build request, as the provided path ($path) was not found in the configuration." ); } $methodConfig = $this->restConfig['interfaces'][$interface][$method] + [ 'placeholders' => [], 'body' => null, 'additionalBindings' => null, ]; $bindings = $this->buildBindings($methodConfig['placeholders'], $message); $uriTemplateConfigs = $this->getConfigsForUriTemplates($methodConfig); foreach ($uriTemplateConfigs as $config) { $pathTemplate = $this->tryRenderPathTemplate($config['uriTemplate'], $bindings); if ($pathTemplate) { // We found a valid uriTemplate - now build and return the Request list($body, $queryParams) = $this->constructBodyAndQueryParameters($message, $config); $uri = $this->buildUri($pathTemplate, $queryParams); return new Request( $config['method'], $uri, ['Content-Type' => 'application/json'] + $headers, $body ); } } // No valid uriTemplate found - construct an exception $uriTemplates = []; foreach ($uriTemplateConfigs as $config) { $uriTemplates[] = $config['uriTemplate']; } throw new ValidationException("Could not map bindings for $path to any Uri template.\n" . "Bindings: " . print_r($bindings, true) . "UriTemplates: " . print_r($uriTemplates, true)); } /** * Create a list of all possible configs using the additionalBindings * * @param array $config * @return array[] An array of configs */ private function getConfigsForUriTemplates($config) { $configs = [$config]; if ($config['additionalBindings']) { foreach ($config['additionalBindings'] as $additionalBinding) { $configs[] = $additionalBinding + $config; } } return $configs; } /** * @param $message * @param $config * @return array Tuple [$body, $queryParams] */ private function constructBodyAndQueryParameters($message, $config) { if ($config['body'] === '*') { return [$message->serializeToJsonString(), []]; } $body = null; $queryParams = []; foreach ($this->getAllProperties($message) as $name => $value) { if (array_key_exists($name, $config['placeholders'])) { continue; } $propertyValue = $this->getPrivatePropertyValue($message, $name); if ($name === $config['body']) { $body = $propertyValue->serializeToJsonString(); continue; } $value = $this->getQuerystringValue($propertyValue); if ($propertyValue instanceof Message && is_array($value)) { foreach ($value as $key => $value2) { $queryParams[$name . '.' . $key] = $value2; } } else { $queryParams[$name] = $value; } } return [$body, $queryParams]; } /** * @param array $placeholders * @param Message $message * @return array Bindings from path template fields to values from message */ private function buildBindings(array $placeholders, Message $message) { $bindings = []; foreach ($placeholders as $placeholder => $metadata) { $value = array_reduce( $metadata['getters'], function (Message $result = null, $getter) { if ($result) { return $result->$getter(); } }, $message ); $bindings[$placeholder] = $value; } return $bindings; } /** * @param $uriTemplate * @param array $bindings * @return null|string * @throws ValidationException */ private function tryRenderPathTemplate($uriTemplate, array $bindings) { $template = new PathTemplate($uriTemplate); try { return $template->render($bindings); } catch (ValidationException $e) { return null; } } /** * @param $path * @param $queryParams * @return UriInterface */ private function buildUri($path, $queryParams) { $uri = Psr7\uri_for( sprintf( 'https://%s/%s', $this->baseUri, $path ) ); if ($queryParams) { $uri = $this->buildUriWithQuery( $uri, $queryParams ); } return $uri; } private function getPrivatePropertyValue(Message $message, $propertyName) { $privatePropertyValueFunc = \Closure::bind(function (Message $message, $propertyName) { return $message->$propertyName; }, null, $message); return $privatePropertyValueFunc($message, $propertyName); } private function getAllProperties(Message $message) { $privatePropertiesFunc = \Closure::bind(function (Message $message) { return get_class_vars(get_class($message)); }, null, $message); return $privatePropertiesFunc($message); } private function getQuerystringValue($propertyValue) { if ($propertyValue instanceof Message) { return $this->messageToArray($propertyValue); } if ($propertyValue instanceof RepeatedField) { return iterator_to_array($propertyValue); } return $propertyValue; } private function messageToArray(Message $message) { if ($this->hasSpecialJsonMapping($message)) { return json_decode($message->serializeToJsonString(), true); } $messageArray = []; foreach ($this->getAllProperties($message) as $name => $value) { $propertyValue = $this->getPrivatePropertyValue($message, $name); $messageArray[$name] = $this->getQuerystringValue($propertyValue); } return $messageArray; } private function hasSpecialJsonMapping(Message $message) { return in_array(get_class($message), [ 'Google\Protobuf\Any', 'Google\Protobuf\ListValue', 'Google\Protobuf\Struct', 'Google\Protobuf\Value', 'Google\Protobuf\Duration', 'Google\Protobuf\Timestamp', 'Google\Protobuf\FieldMask', 'Google\Protobuf\DoubleValue', 'Google\Protobuf\FloatValue', 'Google\Protobuf\Int64Value', 'Google\Protobuf\UInt64Value', 'Google\Protobuf\Int32Value', 'Google\Protobuf\UInt32Value', 'Google\Protobuf\BoolValue', 'Google\Protobuf\StringValue', 'Google\Protobuf\BytesValue' ]); } }