mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-08-27 21:15:40 +02:00
318 lines
7.3 KiB
PHP
318 lines
7.3 KiB
PHP
<?php
|
|
/**
|
|
* A DataFormatter object handles transformation of data from SilverStripe model objects to a particular output
|
|
* format, and vice versa. This is most commonly used in developing RESTful APIs.
|
|
*
|
|
* @package framework
|
|
* @subpackage formatters
|
|
*/
|
|
abstract class DataFormatter extends Object {
|
|
|
|
/**
|
|
* Set priority from 0-100.
|
|
* If multiple formatters for the same extension exist,
|
|
* we select the one with highest priority.
|
|
*
|
|
* @var int
|
|
*/
|
|
private static $priority = 50;
|
|
|
|
/**
|
|
* Follow relations for the {@link DataObject} instances
|
|
* ($has_one, $has_many, $many_many).
|
|
* Set to "0" to disable relation output.
|
|
*
|
|
* @todo Support more than one nesting level
|
|
*
|
|
* @var int
|
|
*/
|
|
public $relationDepth = 1;
|
|
|
|
/**
|
|
* Allows overriding of the fields which are rendered for the
|
|
* processed dataobjects. By default, this includes all
|
|
* fields in {@link DataObject::inheritedDatabaseFields()}.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $customFields = null;
|
|
|
|
/**
|
|
* Allows addition of fields
|
|
* (e.g. custom getters on a DataObject)
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $customAddFields = null;
|
|
|
|
/**
|
|
* Allows to limit or add relations.
|
|
* Only use in combination with {@link $relationDepth}.
|
|
* By default, all relations will be shown.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $customRelations = null;
|
|
|
|
/**
|
|
* Fields which should be expicitly excluded from the export.
|
|
* Comes in handy for field-level permissions.
|
|
* Will overrule both {@link $customAddFields} and {@link $customFields}
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $removeFields = null;
|
|
|
|
/**
|
|
* Specifies the mimetype in which all strings
|
|
* returned from the convert*() methods should be used,
|
|
* e.g. "text/xml".
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $outputContentType = null;
|
|
|
|
/**
|
|
* Used to set totalSize properties on the output
|
|
* of {@link convertDataObjectSet()}, shows the
|
|
* total number of records without the "limit" and "offset"
|
|
* GET parameters. Useful to implement pagination.
|
|
*
|
|
* @var int
|
|
*/
|
|
protected $totalSize;
|
|
|
|
/**
|
|
* Get a DataFormatter object suitable for handling the given file extension.
|
|
*
|
|
* @param string $extension
|
|
* @return DataFormatter
|
|
*/
|
|
public static function for_extension($extension) {
|
|
$classes = ClassInfo::subclassesFor("DataFormatter");
|
|
array_shift($classes);
|
|
$sortedClasses = array();
|
|
foreach($classes as $class) {
|
|
$sortedClasses[$class] = singleton($class)->stat('priority');
|
|
}
|
|
arsort($sortedClasses);
|
|
foreach($sortedClasses as $className => $priority) {
|
|
/** @var DataFormatter $formatter */
|
|
$formatter = new $className();
|
|
if(in_array($extension, $formatter->supportedExtensions())) {
|
|
return $formatter;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Get formatter for the first matching extension.
|
|
*
|
|
* @param array $extensions
|
|
* @return DataFormatter
|
|
*/
|
|
public static function for_extensions($extensions) {
|
|
foreach($extensions as $extension) {
|
|
if($formatter = self::for_extension($extension)) return $formatter;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Get a DataFormatter object suitable for handling the given mimetype.
|
|
*
|
|
* @param string $mimeType
|
|
* @return DataFormatter
|
|
*/
|
|
public static function for_mimetype($mimeType) {
|
|
$classes = ClassInfo::subclassesFor("DataFormatter");
|
|
array_shift($classes);
|
|
$sortedClasses = array();
|
|
foreach($classes as $class) {
|
|
$sortedClasses[$class] = singleton($class)->stat('priority');
|
|
}
|
|
arsort($sortedClasses);
|
|
foreach($sortedClasses as $className => $priority) {
|
|
/** @var DataFormatter $formatter */
|
|
$formatter = new $className();
|
|
if(in_array($mimeType, $formatter->supportedMimeTypes())) {
|
|
return $formatter;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Get formatter for the first matching mimetype.
|
|
* Useful for HTTP Accept headers which can contain
|
|
* multiple comma-separated mimetypes.
|
|
*
|
|
* @param array $mimetypes
|
|
* @return DataFormatter
|
|
*/
|
|
public static function for_mimetypes($mimetypes) {
|
|
foreach($mimetypes as $mimetype) {
|
|
if($formatter = self::for_mimetype($mimetype)) return $formatter;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param array $fields
|
|
*/
|
|
public function setCustomFields($fields) {
|
|
$this->customFields = $fields;
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function getCustomFields() {
|
|
return $this->customFields;
|
|
}
|
|
|
|
/**
|
|
* @param array $fields
|
|
*/
|
|
public function setCustomAddFields($fields) {
|
|
$this->customAddFields = $fields;
|
|
}
|
|
|
|
/**
|
|
* @param array $relations
|
|
*/
|
|
public function setCustomRelations($relations) {
|
|
$this->customRelations = $relations;
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function getCustomRelations() {
|
|
return $this->customRelations;
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function getCustomAddFields() {
|
|
return $this->customAddFields;
|
|
}
|
|
|
|
/**
|
|
* @param array $fields
|
|
*/
|
|
public function setRemoveFields($fields) {
|
|
$this->removeFields = $fields;
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function getRemoveFields() {
|
|
return $this->removeFields;
|
|
}
|
|
|
|
public function getOutputContentType() {
|
|
return $this->outputContentType;
|
|
}
|
|
|
|
/**
|
|
* @param int $size
|
|
*/
|
|
public function setTotalSize($size) {
|
|
$this->totalSize = (int)$size;
|
|
}
|
|
|
|
/**
|
|
* @return int
|
|
*/
|
|
public function getTotalSize() {
|
|
return $this->totalSize;
|
|
}
|
|
|
|
/**
|
|
* Returns all fields on the object which should be shown
|
|
* in the output. Can be customised through {@link self::setCustomFields()}.
|
|
*
|
|
* @todo Allow for custom getters on the processed object (currently filtered through inheritedDatabaseFields)
|
|
* @todo Field level permission checks
|
|
*
|
|
* @param DataObjectInterface|DataObject $obj
|
|
* @return array
|
|
*/
|
|
protected function getFieldsForObj($obj) {
|
|
$dbFields = array();
|
|
|
|
// if custom fields are specified, only select these
|
|
if(is_array($this->customFields)) {
|
|
foreach($this->customFields as $fieldName) {
|
|
// @todo Possible security risk by making methods accessible - implement field-level security
|
|
if($obj->hasField($fieldName) || $obj->hasMethod("get{$fieldName}")) {
|
|
$dbFields[$fieldName] = $fieldName;
|
|
}
|
|
}
|
|
} else {
|
|
// by default, all database fields are selected
|
|
$dbFields = $obj->db();
|
|
}
|
|
|
|
if(is_array($this->customAddFields)) {
|
|
foreach($this->customAddFields as $fieldName) {
|
|
// @todo Possible security risk by making methods accessible - implement field-level security
|
|
if($obj->hasField($fieldName) || $obj->hasMethod("get{$fieldName}")) {
|
|
$dbFields[$fieldName] = $fieldName;
|
|
}
|
|
}
|
|
}
|
|
|
|
// add default required fields
|
|
$dbFields = array_merge($dbFields, array('ID' => 'Int'));
|
|
|
|
if(is_array($this->removeFields)) {
|
|
$dbFields = array_diff_key($dbFields, array_combine($this->removeFields,$this->removeFields));
|
|
}
|
|
|
|
return $dbFields;
|
|
}
|
|
|
|
/**
|
|
* Return an array of the extensions that this data formatter supports
|
|
*
|
|
* @return array
|
|
*/
|
|
abstract public function supportedExtensions();
|
|
|
|
/**
|
|
* Get supported mime types
|
|
*
|
|
* @return array
|
|
*/
|
|
abstract public function supportedMimeTypes();
|
|
|
|
/**
|
|
* Convert a single data object to this format.
|
|
*
|
|
* @param DataObjectInterface $do
|
|
* @return string
|
|
*/
|
|
abstract public function convertDataObject(DataObjectInterface $do);
|
|
|
|
/**
|
|
* Convert a data object set to this format.
|
|
*
|
|
* @param SS_List $set
|
|
* @return string
|
|
*/
|
|
abstract public function convertDataObjectSet(SS_List $set);
|
|
|
|
/**
|
|
* @param string $strData HTTP Payload as string
|
|
* @return array
|
|
*/
|
|
abstract public function convertStringToArray($strData);
|
|
}
|