395 lines
12 KiB
PHP
395 lines
12 KiB
PHP
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<?php
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/**
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* Copyright 2017 Facebook, Inc.
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*
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* You are hereby granted a non-exclusive, worldwide, royalty-free license to
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* use, copy, modify, and distribute this software in source code or binary
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* form for use in connection with the web services and APIs provided by
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* Facebook.
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*
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* As with any software that integrates with the Facebook platform, your use
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* of this software is subject to the Facebook Developer Principles and
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* Policies [http://developers.facebook.com/policy/]. This copyright notice
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* shall be included in all copies or substantial portions of the software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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namespace Facebook\GraphNodes;
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use Facebook\FacebookResponse;
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use Facebook\Exceptions\FacebookSDKException;
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/**
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* Class GraphNodeFactory
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*
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* @package Facebook
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*
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* ## Assumptions ##
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* GraphEdge - is ALWAYS a numeric array
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* GraphEdge - is ALWAYS an array of GraphNode types
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* GraphNode - is ALWAYS an associative array
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* GraphNode - MAY contain GraphNode's "recurrable"
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* GraphNode - MAY contain GraphEdge's "recurrable"
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* GraphNode - MAY contain DateTime's "primitives"
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* GraphNode - MAY contain string's "primitives"
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*/
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class GraphNodeFactory
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{
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/**
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* @const string The base graph object class.
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*/
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const BASE_GRAPH_NODE_CLASS = '\Facebook\GraphNodes\GraphNode';
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/**
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* @const string The base graph edge class.
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*/
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const BASE_GRAPH_EDGE_CLASS = '\Facebook\GraphNodes\GraphEdge';
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/**
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* @const string The graph object prefix.
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*/
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const BASE_GRAPH_OBJECT_PREFIX = '\Facebook\GraphNodes\\';
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/**
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* @var FacebookResponse The response entity from Graph.
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*/
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protected $response;
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/**
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* @var array The decoded body of the FacebookResponse entity from Graph.
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*/
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protected $decodedBody;
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/**
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* Init this Graph object.
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*
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* @param FacebookResponse $response The response entity from Graph.
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*/
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public function __construct(FacebookResponse $response)
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{
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$this->response = $response;
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$this->decodedBody = $response->getDecodedBody();
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}
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/**
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* Tries to convert a FacebookResponse entity into a GraphNode.
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*
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* @param string|null $subclassName The GraphNode sub class to cast to.
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*
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* @return GraphNode
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphNode($subclassName = null)
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{
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$this->validateResponseAsArray();
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$this->validateResponseCastableAsGraphNode();
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return $this->castAsGraphNodeOrGraphEdge($this->decodedBody, $subclassName);
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}
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/**
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* Convenience method for creating a GraphAchievement collection.
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*
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* @return GraphAchievement
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphAchievement()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphAchievement');
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}
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/**
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* Convenience method for creating a GraphAlbum collection.
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*
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* @return GraphAlbum
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphAlbum()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphAlbum');
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}
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/**
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* Convenience method for creating a GraphPage collection.
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*
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* @return GraphPage
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphPage()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphPage');
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}
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/**
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* Convenience method for creating a GraphSessionInfo collection.
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*
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* @return GraphSessionInfo
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphSessionInfo()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphSessionInfo');
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}
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/**
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* Convenience method for creating a GraphUser collection.
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*
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* @return GraphUser
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphUser()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphUser');
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}
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/**
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* Convenience method for creating a GraphEvent collection.
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*
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* @return GraphEvent
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphEvent()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphEvent');
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}
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/**
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* Convenience method for creating a GraphGroup collection.
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*
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* @return GraphGroup
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphGroup()
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{
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return $this->makeGraphNode(static::BASE_GRAPH_OBJECT_PREFIX . 'GraphGroup');
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}
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/**
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* Tries to convert a FacebookResponse entity into a GraphEdge.
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*
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* @param string|null $subclassName The GraphNode sub class to cast the list items to.
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* @param boolean $auto_prefix Toggle to auto-prefix the subclass name.
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*
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* @return GraphEdge
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*
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* @throws FacebookSDKException
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*/
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public function makeGraphEdge($subclassName = null, $auto_prefix = true)
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{
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$this->validateResponseAsArray();
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$this->validateResponseCastableAsGraphEdge();
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if ($subclassName && $auto_prefix) {
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$subclassName = static::BASE_GRAPH_OBJECT_PREFIX . $subclassName;
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}
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return $this->castAsGraphNodeOrGraphEdge($this->decodedBody, $subclassName);
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}
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/**
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* Validates the decoded body.
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*
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* @throws FacebookSDKException
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*/
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public function validateResponseAsArray()
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{
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if (!is_array($this->decodedBody)) {
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throw new FacebookSDKException('Unable to get response from Graph as array.', 620);
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}
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}
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/**
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* Validates that the return data can be cast as a GraphNode.
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*
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* @throws FacebookSDKException
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*/
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public function validateResponseCastableAsGraphNode()
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{
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if (isset($this->decodedBody['data']) && static::isCastableAsGraphEdge($this->decodedBody['data'])) {
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throw new FacebookSDKException(
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'Unable to convert response from Graph to a GraphNode because the response looks like a GraphEdge. Try using GraphNodeFactory::makeGraphEdge() instead.',
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620
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);
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}
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}
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/**
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* Validates that the return data can be cast as a GraphEdge.
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*
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* @throws FacebookSDKException
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*/
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public function validateResponseCastableAsGraphEdge()
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{
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if (!(isset($this->decodedBody['data']) && static::isCastableAsGraphEdge($this->decodedBody['data']))) {
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throw new FacebookSDKException(
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'Unable to convert response from Graph to a GraphEdge because the response does not look like a GraphEdge. Try using GraphNodeFactory::makeGraphNode() instead.',
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620
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);
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}
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}
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/**
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* Safely instantiates a GraphNode of $subclassName.
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*
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* @param array $data The array of data to iterate over.
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* @param string|null $subclassName The subclass to cast this collection to.
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*
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* @return GraphNode
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*
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* @throws FacebookSDKException
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*/
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public function safelyMakeGraphNode(array $data, $subclassName = null)
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{
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$subclassName = $subclassName ?: static::BASE_GRAPH_NODE_CLASS;
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static::validateSubclass($subclassName);
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// Remember the parent node ID
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$parentNodeId = isset($data['id']) ? $data['id'] : null;
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$items = [];
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foreach ($data as $k => $v) {
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// Array means could be recurable
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if (is_array($v)) {
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// Detect any smart-casting from the $graphObjectMap array.
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// This is always empty on the GraphNode collection, but subclasses can define
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// their own array of smart-casting types.
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$graphObjectMap = $subclassName::getObjectMap();
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$objectSubClass = isset($graphObjectMap[$k])
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? $graphObjectMap[$k]
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: null;
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// Could be a GraphEdge or GraphNode
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$items[$k] = $this->castAsGraphNodeOrGraphEdge($v, $objectSubClass, $k, $parentNodeId);
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} else {
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$items[$k] = $v;
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}
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}
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return new $subclassName($items);
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}
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/**
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* Takes an array of values and determines how to cast each node.
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*
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* @param array $data The array of data to iterate over.
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* @param string|null $subclassName The subclass to cast this collection to.
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* @param string|null $parentKey The key of this data (Graph edge).
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* @param string|null $parentNodeId The parent Graph node ID.
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*
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* @return GraphNode|GraphEdge
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*
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* @throws FacebookSDKException
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*/
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public function castAsGraphNodeOrGraphEdge(array $data, $subclassName = null, $parentKey = null, $parentNodeId = null)
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{
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if (isset($data['data'])) {
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// Create GraphEdge
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if (static::isCastableAsGraphEdge($data['data'])) {
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return $this->safelyMakeGraphEdge($data, $subclassName, $parentKey, $parentNodeId);
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}
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// Sometimes Graph is a weirdo and returns a GraphNode under the "data" key
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$outerData = $data;
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unset($outerData['data']);
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$data = $data['data'] + $outerData;
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}
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// Create GraphNode
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return $this->safelyMakeGraphNode($data, $subclassName);
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}
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/**
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* Return an array of GraphNode's.
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*
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* @param array $data The array of data to iterate over.
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* @param string|null $subclassName The GraphNode subclass to cast each item in the list to.
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* @param string|null $parentKey The key of this data (Graph edge).
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* @param string|null $parentNodeId The parent Graph node ID.
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*
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* @return GraphEdge
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*
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* @throws FacebookSDKException
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*/
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public function safelyMakeGraphEdge(array $data, $subclassName = null, $parentKey = null, $parentNodeId = null)
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{
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if (!isset($data['data'])) {
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throw new FacebookSDKException('Cannot cast data to GraphEdge. Expected a "data" key.', 620);
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}
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$dataList = [];
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foreach ($data['data'] as $graphNode) {
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$dataList[] = $this->safelyMakeGraphNode($graphNode, $subclassName);
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}
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$metaData = $this->getMetaData($data);
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// We'll need to make an edge endpoint for this in case it's a GraphEdge (for cursor pagination)
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$parentGraphEdgeEndpoint = $parentNodeId && $parentKey ? '/' . $parentNodeId . '/' . $parentKey : null;
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$className = static::BASE_GRAPH_EDGE_CLASS;
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return new $className($this->response->getRequest(), $dataList, $metaData, $parentGraphEdgeEndpoint, $subclassName);
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}
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/**
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* Get the meta data from a list in a Graph response.
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*
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* @param array $data The Graph response.
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*
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* @return array
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*/
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public function getMetaData(array $data)
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{
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unset($data['data']);
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return $data;
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}
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/**
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* Determines whether or not the data should be cast as a GraphEdge.
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*
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* @param array $data
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*
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* @return boolean
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*/
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public static function isCastableAsGraphEdge(array $data)
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{
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if ($data === []) {
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return true;
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}
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// Checks for a sequential numeric array which would be a GraphEdge
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return array_keys($data) === range(0, count($data) - 1);
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}
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/**
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* Ensures that the subclass in question is valid.
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*
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* @param string $subclassName The GraphNode subclass to validate.
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*
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* @throws FacebookSDKException
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*/
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public static function validateSubclass($subclassName)
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{
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if ($subclassName == static::BASE_GRAPH_NODE_CLASS || is_subclass_of($subclassName, static::BASE_GRAPH_NODE_CLASS)) {
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return;
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}
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throw new FacebookSDKException('The given subclass "' . $subclassName . '" is not valid. Cannot cast to an object that is not a GraphNode subclass.', 620);
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}
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}
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