730 lines
25 KiB
PHP
730 lines
25 KiB
PHP
<?php
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namespace SilverStripe\RestfulServer;
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use SilverStripe\RestfulServer\BasicRestfulAuthenticator;
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use SilverStripe\CMS\Model\SiteTree;
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use SilverStripe\ORM\SS_List;
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use SilverStripe\ORM\ArrayList;
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use SilverStripe\ORM\DataObject;
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use SilverStripe\Control\Director;
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use SilverStripe\ORM\DataList;
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use SilverStripe\Security\Member;
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use SilverStripe\Security\Security;
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use SilverStripe\Control\Controller;
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use SilverStripe\RestfulServer\DataFormatter\DataFormatter;
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use SilverStripe\Control\HTTPRequest;
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/**
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* Generic RESTful server, which handles webservice access to arbitrary DataObjects.
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* Relies on serialization/deserialization into different formats provided
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* by the DataFormatter APIs in core.
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*
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* @todo Finish RestfulServerItem and RestfulServerList implementation and re-enable $url_handlers
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* @todo Implement PUT/POST/DELETE for relations
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* @todo Access-Control for relations (you might be allowed to view Members and Groups,
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* but not their relation with each other)
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* @todo Make SearchContext specification customizeable for each class
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* @todo Allow for range-searches (e.g. on Created column)
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* @todo Filter relation listings by $api_access and canView() permissions
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* @todo Exclude relations when "fields" are specified through URL (they should be explicitly
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* requested in this case)
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* @todo Custom filters per DataObject subclass, e.g. to disallow showing unpublished pages in
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* SiteTree/Versioned/Hierarchy
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* @todo URL parameter namespacing for search-fields, limit, fields, add_fields
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* (might all be valid dataobject properties)
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* e.g. you wouldn't be able to search for a "limit" property on your subclass as
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* its overlayed with the search logic
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* @todo i18n integration (e.g. Page/1.xml?lang=de_DE)
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* @todo Access to extendable methods/relations like SiteTree/1/Versions or SiteTree/1/Version/22
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* @todo Respect $api_access array notation in search contexts
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*
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* @package framework
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* @subpackage api
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*/
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class RestfulServer extends Controller
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{
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private static $url_handlers = array(
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'$ClassName!/$ID/$Relation' => 'handleAction',
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'' => 'notFound'
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#'$ClassName/#ID' => 'handleItem',
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#'$ClassName' => 'handleList',
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);
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private static $api_base = "api/v1/";
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private static $authenticator = BasicRestfulAuthenticator::class;
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/**
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* If no extension is given in the request, resolve to this extension
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* (and subsequently the {@link self::$default_mimetype}.
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*
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* @var string
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*/
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private static $default_extension = "xml";
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/**
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* If no extension is given, resolve the request to this mimetype.
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*
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* @var string
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*/
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protected static $default_mimetype = "text/xml";
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/**
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* @uses authenticate()
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* @var Member
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*/
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protected $member;
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private static $allowed_actions = array(
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'index',
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'notFound'
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);
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/*
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function handleItem($request) {
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return new RestfulServerItem(DataObject::get_by_id($request->param("ClassName"), $request->param("ID")));
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}
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function handleList($request) {
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return new RestfulServerList(DataObject::get($request->param("ClassName"),""));
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}
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*/
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public function init()
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{
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/* This sets up SiteTree the same as when viewing a page through the frontend. Versioned defaults
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* to Stage, and then when viewing the front-end Versioned::choose_site_stage changes it to Live.
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* TODO: In 3.2 we should make the default Live, then change to Stage in the admin area (with a nicer API)
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*/
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if (class_exists(SiteTree::class)) {
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singleton(SiteTree::class)->extend('modelascontrollerInit', $this);
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}
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parent::init();
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}
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/**
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* Backslashes in fully qualified class names (e.g. NameSpaced\ClassName)
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* kills both requests (i.e. URIs) and XML (invalid character in a tag name)
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* So we'll replace them with a hyphen (-), as it's also unambiguious
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* in both cases (invalid in a php class name, and safe in an xml tag name)
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*
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* @param string $classname
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* @return string 'escaped' class name
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*/
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protected function sanitiseClassName($className)
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{
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return str_replace('\\', '-', $className);
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}
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/**
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* Convert hyphen escaped class names back into fully qualified
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* PHP safe variant.
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*
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* @param string $classname
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* @return string syntactically valid classname
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*/
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protected function unsanitiseClassName($className)
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{
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return str_replace('-', '\\', $className);
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}
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/**
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* This handler acts as the switchboard for the controller.
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* Since no $Action url-param is set, all requests are sent here.
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*/
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public function index(HTTPRequest $request)
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{
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$className = $this->unsanitiseClassName($request->param('ClassName'));
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$id = $request->param('ID') ?: null;
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$relation = $request->param('Relation') ?: null;
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// Check input formats
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if (!class_exists($className)) {
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return $this->notFound();
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}
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if ($id && !is_numeric($id)) {
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return $this->notFound();
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}
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if ($relation
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&& !preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $relation)
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) {
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return $this->notFound();
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}
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// if api access is disabled, don't proceed
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$apiAccess = singleton($className)->stat('api_access');
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if (!$apiAccess) {
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return $this->permissionFailure();
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}
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// authenticate through HTTP BasicAuth
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$this->member = $this->authenticate();
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// handle different HTTP verbs
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if ($this->request->isGET() || $this->request->isHEAD()) {
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return $this->getHandler($className, $id, $relation);
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}
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if ($this->request->isPOST()) {
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return $this->postHandler($className, $id, $relation);
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}
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if ($this->request->isPUT()) {
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return $this->putHandler($className, $id, $relation);
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}
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if ($this->request->isDELETE()) {
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return $this->deleteHandler($className, $id, $relation);
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}
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// if no HTTP verb matches, return error
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return $this->methodNotAllowed();
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}
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/**
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* Handler for object read.
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*
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* The data object will be returned in the following format:
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*
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* <ClassName>
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* <FieldName>Value</FieldName>
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* ...
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* <HasOneRelName id="ForeignID" href="LinkToForeignRecordInAPI" />
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* ...
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* <HasManyRelName>
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* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
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* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
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* </HasManyRelName>
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* ...
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* <ManyManyRelName>
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* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
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* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
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* </ManyManyRelName>
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* </ClassName>
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*
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* Access is controlled by two variables:
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*
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* - static $api_access must be set. This enables the API on a class by class basis
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* - $obj->canView() must return true. This lets you implement record-level security
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*
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* @todo Access checking
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*
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* @param String $className
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* @param Int $id
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* @param String $relation
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* @return String The serialized representation of the requested object(s) - usually XML or JSON.
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*/
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protected function getHandler($className, $id, $relationName)
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{
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$sort = '';
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if ($this->request->getVar('sort')) {
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$dir = $this->request->getVar('dir');
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$sort = array($this->request->getVar('sort') => ($dir ? $dir : 'ASC'));
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}
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$limit = array(
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'start' => $this->request->getVar('start'),
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'limit' => $this->request->getVar('limit')
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);
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$params = $this->request->getVars();
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$responseFormatter = $this->getResponseDataFormatter($className);
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if (!$responseFormatter) {
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return $this->unsupportedMediaType();
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}
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// $obj can be either a DataObject or a SS_List,
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// depending on the request
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if ($id) {
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// Format: /api/v1/<MyClass>/<ID>
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$obj = $this->getObjectQuery($className, $id, $params)->First();
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if (!$obj) {
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return $this->notFound();
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}
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if (!$obj->canView($this->getMember())) {
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return $this->permissionFailure();
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}
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// Format: /api/v1/<MyClass>/<ID>/<Relation>
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if ($relationName) {
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$obj = $this->getObjectRelationQuery($obj, $params, $sort, $limit, $relationName);
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if (!$obj) {
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return $this->notFound();
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}
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// TODO Avoid creating data formatter again for relation class (see above)
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$responseFormatter = $this->getResponseDataFormatter($obj->dataClass());
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}
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} else {
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// Format: /api/v1/<MyClass>
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$obj = $this->getObjectsQuery($className, $params, $sort, $limit);
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}
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$this->getResponse()->addHeader('Content-Type', $responseFormatter->getOutputContentType());
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$rawFields = $this->request->getVar('fields');
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$fields = $rawFields ? explode(',', $rawFields) : null;
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if ($obj instanceof SS_List) {
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$objs = ArrayList::create($obj->toArray());
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foreach ($objs as $obj) {
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if (!$obj->canView($this->getMember())) {
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$objs->remove($obj);
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}
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}
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$responseFormatter->setTotalSize($objs->count());
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return $responseFormatter->convertDataObjectSet($objs, $fields);
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}
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if (!$obj) {
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$responseFormatter->setTotalSize(0);
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return $responseFormatter->convertDataObjectSet(new ArrayList(), $fields);
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}
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return $responseFormatter->convertDataObject($obj, $fields);
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}
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/**
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* Uses the default {@link SearchContext} specified through
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* {@link DataObject::getDefaultSearchContext()} to augument
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* an existing query object (mostly a component query from {@link DataObject})
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* with search clauses.
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*
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* @todo Allow specifying of different searchcontext getters on model-by-model basis
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*
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* @param string $className
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* @param array $params
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* @return SS_List
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*/
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protected function getSearchQuery(
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$className,
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$params = null,
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$sort = null,
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$limit = null,
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$existingQuery = null
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) {
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if (singleton($className)->hasMethod('getRestfulSearchContext')) {
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$searchContext = singleton($className)->{'getRestfulSearchContext'}();
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} else {
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$searchContext = singleton($className)->getDefaultSearchContext();
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}
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return $searchContext->getQuery($params, $sort, $limit, $existingQuery);
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}
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/**
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* Returns a dataformatter instance based on the request
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* extension or mimetype. Falls back to {@link self::$default_extension}.
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*
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* @param boolean $includeAcceptHeader Determines wether to inspect and prioritize any HTTP Accept headers
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* @param String Classname of a DataObject
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* @return DataFormatter
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*/
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protected function getDataFormatter($includeAcceptHeader = false, $className = null)
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{
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$extension = $this->request->getExtension();
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$contentTypeWithEncoding = $this->request->getHeader('Content-Type');
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preg_match('/([^;]*)/', $contentTypeWithEncoding, $contentTypeMatches);
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$contentType = $contentTypeMatches[0];
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$accept = $this->request->getHeader('Accept');
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$mimetypes = $this->request->getAcceptMimetypes();
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if (!$className) {
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$className = $this->unsanitiseClassName($this->request->param('ClassName'));
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}
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// get formatter
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if (!empty($extension)) {
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$formatter = DataFormatter::for_extension($extension);
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} elseif ($includeAcceptHeader && !empty($accept) && $accept != '*/*') {
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$formatter = DataFormatter::for_mimetypes($mimetypes);
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if (!$formatter) {
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$formatter = DataFormatter::for_extension(self::$default_extension);
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}
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} elseif (!empty($contentType)) {
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$formatter = DataFormatter::for_mimetype($contentType);
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} else {
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$formatter = DataFormatter::for_extension(self::$default_extension);
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}
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if (!$formatter) {
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return false;
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}
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// set custom fields
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if ($customAddFields = $this->request->getVar('add_fields')) {
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$formatter->setCustomAddFields(explode(',', $customAddFields));
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}
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if ($customFields = $this->request->getVar('fields')) {
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$formatter->setCustomFields(explode(',', $customFields));
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}
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$formatter->setCustomRelations($this->getAllowedRelations($className));
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$apiAccess = singleton($className)->stat('api_access');
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if (is_array($apiAccess)) {
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$formatter->setCustomAddFields(
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array_intersect((array)$formatter->getCustomAddFields(), (array)$apiAccess['view'])
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);
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if ($formatter->getCustomFields()) {
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$formatter->setCustomFields(
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array_intersect((array)$formatter->getCustomFields(), (array)$apiAccess['view'])
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);
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} else {
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$formatter->setCustomFields((array)$apiAccess['view']);
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}
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if ($formatter->getCustomRelations()) {
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$formatter->setCustomRelations(
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array_intersect((array)$formatter->getCustomRelations(), (array)$apiAccess['view'])
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);
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} else {
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$formatter->setCustomRelations((array)$apiAccess['view']);
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}
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}
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// set relation depth
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$relationDepth = $this->request->getVar('relationdepth');
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if (is_numeric($relationDepth)) {
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$formatter->relationDepth = (int)$relationDepth;
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}
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return $formatter;
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}
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/**
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* @param String Classname of a DataObject
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* @return DataFormatter
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*/
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protected function getRequestDataFormatter($className = null)
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{
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return $this->getDataFormatter(false, $className);
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}
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/**
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* @param String Classname of a DataObject
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* @return DataFormatter
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*/
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protected function getResponseDataFormatter($className = null)
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{
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return $this->getDataFormatter(true, $className);
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}
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/**
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* Handler for object delete
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*/
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protected function deleteHandler($className, $id)
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{
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$obj = DataObject::get_by_id($className, $id);
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if (!$obj) {
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return $this->notFound();
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}
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if (!$obj->canDelete($this->getMember())) {
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return $this->permissionFailure();
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}
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$obj->delete();
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$this->getResponse()->setStatusCode(204); // No Content
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return true;
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}
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/**
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* Handler for object write
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*/
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protected function putHandler($className, $id)
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{
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$obj = DataObject::get_by_id($className, $id);
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if (!$obj) {
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return $this->notFound();
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}
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if (!$obj->canEdit($this->getMember())) {
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return $this->permissionFailure();
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}
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$reqFormatter = $this->getRequestDataFormatter($className);
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if (!$reqFormatter) {
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return $this->unsupportedMediaType();
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}
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$responseFormatter = $this->getResponseDataFormatter($className);
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if (!$responseFormatter) {
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return $this->unsupportedMediaType();
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}
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/** @var DataObject|string */
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$obj = $this->updateDataObject($obj, $reqFormatter);
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if (is_string($obj)) {
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return $obj;
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}
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$this->getResponse()->setStatusCode(200); // Success
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$this->getResponse()->addHeader('Content-Type', $responseFormatter->getOutputContentType());
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// Append the default extension for the output format to the Location header
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// or else we'll use the default (XML)
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$types = $responseFormatter->supportedExtensions();
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$type = '';
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if (count($types)) {
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$type = ".{$types[0]}";
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}
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$urlSafeClassName = $this->sanitiseClassName(get_class($obj));
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$objHref = Director::absoluteURL(self::$api_base . "$urlSafeClassName/$obj->ID" . $type);
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$this->getResponse()->addHeader('Location', $objHref);
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return $responseFormatter->convertDataObject($obj);
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}
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/**
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* Handler for object append / method call.
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*
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* @todo Posting to an existing URL (without a relation)
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* current resolves in creatig a new element,
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* rather than a "Conflict" message.
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*/
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protected function postHandler($className, $id, $relation)
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{
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if ($id) {
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if (!$relation) {
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$this->response->setStatusCode(409);
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return 'Conflict';
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}
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$obj = DataObject::get_by_id($className, $id);
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if (!$obj) {
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return $this->notFound();
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}
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if (!$obj->hasMethod($relation)) {
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return $this->notFound();
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}
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if (!$obj->stat('allowed_actions') || !in_array($relation, $obj->stat('allowed_actions'))) {
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return $this->permissionFailure();
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}
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$obj->$relation();
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$this->getResponse()->setStatusCode(204); // No Content
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return true;
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}
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if (!singleton($className)->canCreate($this->getMember())) {
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return $this->permissionFailure();
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}
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$obj = new $className();
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$reqFormatter = $this->getRequestDataFormatter($className);
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if (!$reqFormatter) {
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return $this->unsupportedMediaType();
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}
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$responseFormatter = $this->getResponseDataFormatter($className);
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/** @var DataObject|string $obj */
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$obj = $this->updateDataObject($obj, $reqFormatter);
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if (is_string($obj)) {
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return $obj;
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}
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$this->getResponse()->setStatusCode(201); // Created
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$this->getResponse()->addHeader('Content-Type', $responseFormatter->getOutputContentType());
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// Append the default extension for the output format to the Location header
|
|
// or else we'll use the default (XML)
|
|
$types = $responseFormatter->supportedExtensions();
|
|
$type = '';
|
|
if (count($types)) {
|
|
$type = ".{$types[0]}";
|
|
}
|
|
|
|
$urlSafeClassName = $this->sanitiseClassName(get_class($obj));
|
|
$objHref = Director::absoluteURL(self::$api_base . "$urlSafeClassName/$obj->ID" . $type);
|
|
$this->getResponse()->addHeader('Location', $objHref);
|
|
|
|
return $responseFormatter->convertDataObject($obj);
|
|
}
|
|
|
|
/**
|
|
* Converts either the given HTTP Body into an array
|
|
* (based on the DataFormatter instance), or returns
|
|
* the POST variables.
|
|
* Automatically filters out certain critical fields
|
|
* that shouldn't be set by the client (e.g. ID).
|
|
*
|
|
* @param DataObject $obj
|
|
* @param DataFormatter $formatter
|
|
* @return DataObject|string The passed object, or "No Content" if incomplete input data is provided
|
|
*/
|
|
protected function updateDataObject($obj, $formatter)
|
|
{
|
|
// if neither an http body nor POST data is present, return error
|
|
$body = $this->request->getBody();
|
|
if (!$body && !$this->request->postVars()) {
|
|
$this->getResponse()->setStatusCode(204); // No Content
|
|
return 'No Content';
|
|
}
|
|
|
|
if (!empty($body)) {
|
|
$data = $formatter->convertStringToArray($body);
|
|
} else {
|
|
// assume application/x-www-form-urlencoded which is automatically parsed by PHP
|
|
$data = $this->request->postVars();
|
|
}
|
|
|
|
// @todo Disallow editing of certain keys in database
|
|
$data = array_diff_key($data, array('ID', 'Created'));
|
|
|
|
$className = $this->unsanitiseClassName($this->request->param('ClassName'));
|
|
$apiAccess = singleton($className)->config()->api_access;
|
|
if (is_array($apiAccess) && isset($apiAccess['edit'])) {
|
|
$data = array_intersect_key($data, array_combine($apiAccess['edit'], $apiAccess['edit']));
|
|
}
|
|
|
|
$obj->update($data);
|
|
$obj->write();
|
|
|
|
return $obj;
|
|
}
|
|
|
|
/**
|
|
* Gets a single DataObject by ID,
|
|
* through a request like /api/v1/<MyClass>/<MyID>
|
|
*
|
|
* @param string $className
|
|
* @param int $id
|
|
* @param array $params
|
|
* @return DataList
|
|
*/
|
|
protected function getObjectQuery($className, $id, $params)
|
|
{
|
|
return DataList::create($className)->byIDs(array($id));
|
|
}
|
|
|
|
/**
|
|
* @param DataObject $obj
|
|
* @param array $params
|
|
* @param int|array $sort
|
|
* @param int|array $limit
|
|
* @return SQLQuery
|
|
*/
|
|
protected function getObjectsQuery($className, $params, $sort, $limit)
|
|
{
|
|
return $this->getSearchQuery($className, $params, $sort, $limit);
|
|
}
|
|
|
|
|
|
/**
|
|
* @param DataObject $obj
|
|
* @param array $params
|
|
* @param int|array $sort
|
|
* @param int|array $limit
|
|
* @param string $relationName
|
|
* @return SQLQuery|boolean
|
|
*/
|
|
protected function getObjectRelationQuery($obj, $params, $sort, $limit, $relationName)
|
|
{
|
|
// The relation method will return a DataList, that getSearchQuery subsequently manipulates
|
|
if ($obj->hasMethod($relationName)) {
|
|
// $this->HasOneName() will return a dataobject or null, neither
|
|
// of which helps us get the classname in a consistent fashion.
|
|
// So we must use a way that is reliable.
|
|
if ($relationClass = DataObject::getSchema()->hasOneComponent(get_class($obj), $relationName)) {
|
|
$joinField = $relationName . 'ID';
|
|
// Again `byID` will return the wrong type for our purposes. So use `byIDs`
|
|
$list = DataList::create($relationClass)->byIDs([$obj->$joinField]);
|
|
} else {
|
|
$list = $obj->$relationName();
|
|
}
|
|
|
|
$apiAccess = singleton($list->dataClass())->stat('api_access');
|
|
if (!$apiAccess) {
|
|
return false;
|
|
}
|
|
|
|
return $this->getSearchQuery($list->dataClass(), $params, $sort, $limit, $list);
|
|
}
|
|
}
|
|
|
|
protected function permissionFailure()
|
|
{
|
|
// return a 401
|
|
$this->getResponse()->setStatusCode(401);
|
|
$this->getResponse()->addHeader('WWW-Authenticate', 'Basic realm="API Access"');
|
|
$this->getResponse()->addHeader('Content-Type', 'text/plain');
|
|
return "You don't have access to this item through the API.";
|
|
}
|
|
|
|
protected function notFound()
|
|
{
|
|
// return a 404
|
|
$this->getResponse()->setStatusCode(404);
|
|
$this->getResponse()->addHeader('Content-Type', 'text/plain');
|
|
return "That object wasn't found";
|
|
}
|
|
|
|
protected function methodNotAllowed()
|
|
{
|
|
$this->getResponse()->setStatusCode(405);
|
|
$this->getResponse()->addHeader('Content-Type', 'text/plain');
|
|
return "Method Not Allowed";
|
|
}
|
|
|
|
protected function unsupportedMediaType()
|
|
{
|
|
$this->response->setStatusCode(415); // Unsupported Media Type
|
|
$this->getResponse()->addHeader('Content-Type', 'text/plain');
|
|
return "Unsupported Media Type";
|
|
}
|
|
|
|
/**
|
|
* A function to authenticate a user
|
|
*
|
|
* @return Member|false the logged in member
|
|
*/
|
|
protected function authenticate()
|
|
{
|
|
$authClass = $this->config()->authenticator;
|
|
$member = $authClass::authenticate();
|
|
Security::setCurrentUser($member);
|
|
return $member;
|
|
}
|
|
|
|
/**
|
|
* Return only relations which have $api_access enabled.
|
|
* @todo Respect field level permissions once they are available in core
|
|
*
|
|
* @param string $class
|
|
* @param Member $member
|
|
* @return array
|
|
*/
|
|
protected function getAllowedRelations($class, $member = null)
|
|
{
|
|
$allowedRelations = array();
|
|
$obj = singleton($class);
|
|
$relations = (array)$obj->hasOne() + (array)$obj->hasMany() + (array)$obj->manyMany();
|
|
if ($relations) {
|
|
foreach ($relations as $relName => $relClass) {
|
|
//remove dot notation from relation names
|
|
$parts = explode('.', $relClass);
|
|
$relClass = array_shift($parts);
|
|
if (singleton($relClass)->stat('api_access')) {
|
|
$allowedRelations[] = $relName;
|
|
}
|
|
}
|
|
}
|
|
return $allowedRelations;
|
|
}
|
|
|
|
/**
|
|
* Get the current Member, if available
|
|
*
|
|
* @return Member|null
|
|
*/
|
|
protected function getMember()
|
|
{
|
|
return Security::getCurrentUser();
|
|
}
|
|
}
|