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