silverstripe-restfulserver/code/RestfulServer.php

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2012-06-04 10:14:02 +02:00
<?php
/**
* Generic RESTful server, which handles webservice access to arbitrary DataObjects.
* Relies on serialization/deserialization into different formats provided
* by the DataFormatter APIs in core.
*
* @todo Finish RestfulServer_Item and RestfulServer_List implementation and re-enable $url_handlers
* @todo Implement PUT/POST/DELETE for relations
* @todo Access-Control for relations (you might be allowed to view Members and Groups, but not their relation with each other)
* @todo Make SearchContext specification customizeable for each class
* @todo Allow for range-searches (e.g. on Created column)
* @todo Allow other authentication methods (currently only HTTP BasicAuth)
* @todo Filter relation listings by $api_access and canView() permissions
* @todo Exclude relations when "fields" are specified through URL (they should be explicitly requested in this case)
* @todo Custom filters per DataObject subclass, e.g. to disallow showing unpublished pages in SiteTree/Versioned/Hierarchy
* @todo URL parameter namespacing for search-fields, limit, fields, add_fields (might all be valid dataobject properties)
* e.g. you wouldn't be able to search for a "limit" property on your subclass as its overlayed with the search logic
* @todo i18n integration (e.g. Page/1.xml?lang=de_DE)
* @todo Access to extendable methods/relations like SiteTree/1/Versions or SiteTree/1/Version/22
* @todo Respect $api_access array notation in search contexts
*
* @package framework
* @subpackage api
*/
class RestfulServer extends Controller {
static $url_handlers = array(
'$ClassName/$ID/$Relation' => 'handleAction'
#'$ClassName/#ID' => 'handleItem',
#'$ClassName' => 'handleList',
);
protected static $api_base = "api/v1/";
/**
* If no extension is given in the request, resolve to this extension
* (and subsequently the {@link self::$default_mimetype}.
*
* @var string
*/
public static $default_extension = "xml";
/**
* If no extension is given, resolve the request to this mimetype.
*
* @var string
*/
protected static $default_mimetype = "text/xml";
/**
* @uses authenticate()
* @var Member
*/
protected $member;
static $allowed_actions = array(
'index'
);
/*
function handleItem($request) {
return new RestfulServer_Item(DataObject::get_by_id($request->param("ClassName"), $request->param("ID")));
}
function handleList($request) {
return new RestfulServer_List(DataObject::get($request->param("ClassName"),""));
}
*/
/**
* This handler acts as the switchboard for the controller.
* Since no $Action url-param is set, all requests are sent here.
*/
function index() {
if(!isset($this->urlParams['ClassName'])) return $this->notFound();
$className = $this->urlParams['ClassName'];
$id = (isset($this->urlParams['ID'])) ? $this->urlParams['ID'] : null;
$relation = (isset($this->urlParams['Relation'])) ? $this->urlParams['Relation'] : null;
// Check input formats
if(!class_exists($className)) return $this->notFound();
if($id && !is_numeric($id)) return $this->notFound();
if($relation && !preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $relation)) return $this->notFound();
// if api access is disabled, don't proceed
$apiAccess = singleton($className)->stat('api_access');
if(!$apiAccess) return $this->permissionFailure();
// authenticate through HTTP BasicAuth
$this->member = $this->authenticate();
// handle different HTTP verbs
if($this->request->isGET() || $this->request->isHEAD()) return $this->getHandler($className, $id, $relation);
if($this->request->isPOST()) return $this->postHandler($className, $id, $relation);
if($this->request->isPUT()) return $this->putHandler($className, $id, $relation);
if($this->request->isDELETE()) return $this->deleteHandler($className, $id, $relation);
// if no HTTP verb matches, return error
return $this->methodNotAllowed();
}
/**
* Handler for object read.
*
* The data object will be returned in the following format:
*
* <ClassName>
* <FieldName>Value</FieldName>
* ...
* <HasOneRelName id="ForeignID" href="LinkToForeignRecordInAPI" />
* ...
* <HasManyRelName>
* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
* </HasManyRelName>
* ...
* <ManyManyRelName>
* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
* <ForeignClass id="ForeignID" href="LinkToForeignRecordInAPI" />
* </ManyManyRelName>
* </ClassName>
*
* Access is controlled by two variables:
*
* - static $api_access must be set. This enables the API on a class by class basis
* - $obj->canView() must return true. This lets you implement record-level security
*
* @todo Access checking
*
* @param String $className
* @param Int $id
* @param String $relation
* @return String The serialized representation of the requested object(s) - usually XML or JSON.
*/
protected function getHandler($className, $id, $relationName) {
$sort = '';
if($this->request->getVar('sort')) {
$dir = $this->request->getVar('dir');
$sort = array($this->request->getVar('sort') => ($dir ? $dir : 'ASC'));
}
$limit = array(
'start' => $this->request->getVar('start'),
'limit' => $this->request->getVar('limit')
);
$params = $this->request->getVars();
$responseFormatter = $this->getResponseDataFormatter($className);
if(!$responseFormatter) return $this->unsupportedMediaType();
// $obj can be either a DataObject or a SS_List,
// depending on the request
if($id) {
// Format: /api/v1/<MyClass>/<ID>
$obj = $this->getObjectQuery($className, $id, $params)->First();
if(!$obj) return $this->notFound();
if(!$obj->canView()) return $this->permissionFailure();
// Format: /api/v1/<MyClass>/<ID>/<Relation>
if($relationName) {
$obj = $this->getObjectRelationQuery($obj, $params, $sort, $limit, $relationName);
if(!$obj) return $this->notFound();
// TODO Avoid creating data formatter again for relation class (see above)
$responseFormatter = $this->getResponseDataFormatter($obj->dataClass());
}
} else {
// Format: /api/v1/<MyClass>
$obj = $this->getObjectsQuery($className, $params, $sort, $limit);
}
$this->getResponse()->addHeader('Content-Type', $responseFormatter->getOutputContentType());
$rawFields = $this->request->getVar('fields');
$fields = $rawFields ? explode(',', $rawFields) : null;
if($obj instanceof SS_List) {
$responseFormatter->setTotalSize($obj->dataQuery()->query()->unlimitedRowCount());
$objs = new ArrayList($obj->toArray());
foreach($objs as $obj) if(!$obj->canView()) $objs->remove($obj);
return $responseFormatter->convertDataObjectSet($objs, $fields);
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} else if(!$obj) {
$responseFormatter->setTotalSize(0);
return $responseFormatter->convertDataObjectSet(new ArrayList(), $fields);
} else {
return $responseFormatter->convertDataObject($obj, $fields);
}
}
/**
* Uses the default {@link SearchContext} specified through
* {@link DataObject::getDefaultSearchContext()} to augument
* an existing query object (mostly a component query from {@link DataObject})
* with search clauses.
*
* @todo Allow specifying of different searchcontext getters on model-by-model basis
*
* @param string $className
* @param array $params
* @return SS_List
*/
protected function getSearchQuery($className, $params = null, $sort = null, $limit = null, $existingQuery = null) {
if(singleton($className)->hasMethod('getRestfulSearchContext')) {
$searchContext = singleton($className)->{'getRestfulSearchContext'}();
} else {
$searchContext = singleton($className)->getDefaultSearchContext();
}
return $searchContext->getQuery($params, $sort, $limit, $existingQuery);
}
/**
* Returns a dataformatter instance based on the request
* extension or mimetype. Falls back to {@link self::$default_extension}.
*
* @param boolean $includeAcceptHeader Determines wether to inspect and prioritize any HTTP Accept headers
* @param String Classname of a DataObject
* @return DataFormatter
*/
protected function getDataFormatter($includeAcceptHeader = false, $className = null) {
$extension = $this->request->getExtension();
$contentTypeWithEncoding = $this->request->getHeader('Content-Type');
preg_match('/([^;]*)/',$contentTypeWithEncoding, $contentTypeMatches);
$contentType = $contentTypeMatches[0];
$accept = $this->request->getHeader('Accept');
$mimetypes = $this->request->getAcceptMimetypes();
if(!$className) $className = $this->urlParams['ClassName'];
// get formatter
if(!empty($extension)) {
$formatter = DataFormatter::for_extension($extension);
}elseif($includeAcceptHeader && !empty($accept) && $accept != '*/*') {
$formatter = DataFormatter::for_mimetypes($mimetypes);
if(!$formatter) $formatter = DataFormatter::for_extension(self::$default_extension);
} elseif(!empty($contentType)) {
$formatter = DataFormatter::for_mimetype($contentType);
} else {
$formatter = DataFormatter::for_extension(self::$default_extension);
}
if(!$formatter) return false;
// set custom fields
if($customAddFields = $this->request->getVar('add_fields')) $formatter->setCustomAddFields(explode(',',$customAddFields));
if($customFields = $this->request->getVar('fields')) $formatter->setCustomFields(explode(',',$customFields));
$formatter->setCustomRelations($this->getAllowedRelations($className));
$apiAccess = singleton($className)->stat('api_access');
if(is_array($apiAccess)) {
$formatter->setCustomAddFields(array_intersect((array)$formatter->getCustomAddFields(), (array)$apiAccess['view']));
if($formatter->getCustomFields()) {
$formatter->setCustomFields(array_intersect((array)$formatter->getCustomFields(), (array)$apiAccess['view']));
} else {
$formatter->setCustomFields((array)$apiAccess['view']);
}
if($formatter->getCustomRelations()) {
$formatter->setCustomRelations(array_intersect((array)$formatter->getCustomRelations(), (array)$apiAccess['view']));
} else {
$formatter->setCustomRelations((array)$apiAccess['view']);
}
}
// set relation depth
$relationDepth = $this->request->getVar('relationdepth');
if(is_numeric($relationDepth)) $formatter->relationDepth = (int)$relationDepth;
return $formatter;
}
/**
* @param String Classname of a DataObject
* @return DataFormatter
*/
protected function getRequestDataFormatter($className = null) {
return $this->getDataFormatter(false, $className);
}
/**
* @param String Classname of a DataObject
* @return DataFormatter
*/
protected function getResponseDataFormatter($className = null) {
return $this->getDataFormatter(true, $className);
}
/**
* Handler for object delete
*/
protected function deleteHandler($className, $id) {
$obj = DataObject::get_by_id($className, $id);
if(!$obj) return $this->notFound();
if(!$obj->canDelete()) return $this->permissionFailure();
$obj->delete();
$this->getResponse()->setStatusCode(204); // No Content
return true;
}
/**
* Handler for object write
*/
protected function putHandler($className, $id) {
$obj = DataObject::get_by_id($className, $id);
if(!$obj) return $this->notFound();
if(!$obj->canEdit()) return $this->permissionFailure();
$reqFormatter = $this->getRequestDataFormatter($className);
if(!$reqFormatter) return $this->unsupportedMediaType();
$responseFormatter = $this->getResponseDataFormatter($className);
if(!$responseFormatter) return $this->unsupportedMediaType();
$obj = $this->updateDataObject($obj, $reqFormatter);
$this->getResponse()->setStatusCode(200); // Success
$this->getResponse()->addHeader('Content-Type', $responseFormatter->getOutputContentType());
// 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]}";
}
$objHref = Director::absoluteURL(self::$api_base . "$obj->class/$obj->ID" . $type);
$this->getResponse()->addHeader('Location', $objHref);
return $responseFormatter->convertDataObject($obj);
}
/**
* Handler for object append / method call.
*
* @todo Posting to an existing URL (without a relation)
* current resolves in creatig a new element,
* rather than a "Conflict" message.
*/
protected function postHandler($className, $id, $relation) {
if($id) {
if(!$relation) {
$this->response->setStatusCode(409);
return 'Conflict';
}
$obj = DataObject::get_by_id($className, $id);
if(!$obj) return $this->notFound();
if(!$obj->hasMethod($relation)) {
return $this->notFound();
}
if(!$obj->stat('allowed_actions') || !in_array($relation, $obj->stat('allowed_actions'))) {
return $this->permissionFailure();
}
$obj->$relation();
$this->getResponse()->setStatusCode(204); // No Content
return true;
} else {
if(!singleton($className)->canCreate()) return $this->permissionFailure();
$obj = new $className();
$reqFormatter = $this->getRequestDataFormatter($className);
if(!$reqFormatter) return $this->unsupportedMediaType();
$responseFormatter = $this->getResponseDataFormatter($className);
$obj = $this->updateDataObject($obj, $reqFormatter);
$this->getResponse()->setStatusCode(201); // Created
$this->getResponse()->addHeader('Content-Type', $responseFormatter->getOutputContentType());
// 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]}";
}
$objHref = Director::absoluteURL(self::$api_base . "$obj->class/$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 $formatter
* @return DataObject The passed object
*/
protected function updateDataObject($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'));
$apiAccess = singleton($this->urlParams['ClassName'])->stat('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($relationName)) {
if($relationClass = $obj->has_one($relationName)) {
$joinField = $relationName . 'ID';
$list = DataList::create($relationClass)->byIDs(array($obj->$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
$this->getResponse()->addHeader('Content-Type', 'text/plain');
return "Unsupported Media Type";
}
protected function authenticate() {
if(!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW'])) return false;
if($member = Member::currentUser()) return $member;
$member = MemberAuthenticator::authenticate(array(
'Email' => $_SERVER['PHP_AUTH_USER'],
'Password' => $_SERVER['PHP_AUTH_PW'],
), null);
if($member) {
$member->LogIn(false);
return $member;
} else {
return false;
}
}
/**
* 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->has_one() + (array)$obj->has_many() + (array)$obj->many_many();
if($relations) foreach($relations as $relName => $relClass) {
if(singleton($relClass)->stat('api_access')) {
$allowedRelations[] = $relName;
}
}
return $allowedRelations;
}
}
/**
* Restful server handler for a SS_List
*
* @package framework
* @subpackage api
*/
class RestfulServer_List {
static $url_handlers = array(
'#ID' => 'handleItem',
);
function __construct($list) {
$this->list = $list;
}
function handleItem($request) {
return new RestulServer_Item($this->list->getById($request->param('ID')));
}
}
/**
* Restful server handler for a single DataObject
*
* @package framework
* @subpackage api
*/
class RestfulServer_Item {
static $url_handlers = array(
'$Relation' => 'handleRelation',
);
function __construct($item) {
$this->item = $item;
}
function handleRelation($request) {
$funcName = $request('Relation');
$relation = $this->item->$funcName();
if($relation instanceof SS_List) return new RestfulServer_List($relation);
else return new RestfulServer_Item($relation);
}
}