PhabricatorEditEngine.php
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Created: Thu, Feb 13, 06:13

PhabricatorEditEngine.php
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	<?php


	/**
	* @task fields Managing Fields
	* @task text Display Text
	* @task config Edit Engine Configuration
	* @task uri Managing URIs
	* @task load Creating and Loading Objects
	* @task web Responding to Web Requests
	* @task edit Responding to Edit Requests
	* @task http Responding to HTTP Parameter Requests
	* @task conduit Responding to Conduit Requests
	*/
	abstract class PhabricatorEditEngine
	extends Phobject
	implements PhabricatorPolicyInterface {

	const EDITENGINECONFIG_DEFAULT = 'default';

	private $viewer;
	private $controller;
	private $isCreate;
	private $editEngineConfiguration;
	private $contextParameters = array();
	private $targetObject;
	private $page;
	private $pages;

	final public function setViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	final public function getViewer() {
	return $this->viewer;
	}

	final public function setController(PhabricatorController $controller) {
	$this->controller = $controller;
	$this->setViewer($controller->getViewer());
	return $this;
	}

	final public function getController() {
	return $this->controller;
	}

	final public function getEngineKey() {
	return $this->getPhobjectClassConstant('ENGINECONST', 64);
	}

	final public function getApplication() {
	$app_class = $this->getEngineApplicationClass();
	return PhabricatorApplication::getByClass($app_class);
	}

	final public function addContextParameter($key) {
	$this->contextParameters[] = $key;
	return $this;
	}

	public function isEngineConfigurable() {
	return true;
	}

	public function isEngineExtensible() {
	return true;
	}

	/**
	* Force the engine to edit a particular object.
	*/
	public function setTargetObject($target_object) {
	$this->targetObject = $target_object;
	return $this;
	}

	public function getTargetObject() {
	return $this->targetObject;
	}


	/* -( Managing Fields )---------------------------------------------------- */


	abstract public function getEngineApplicationClass();
	abstract protected function buildCustomEditFields($object);

	public function getFieldsForConfig(
	PhabricatorEditEngineConfiguration $config) {

	$object = $this->newEditableObject();

	$this->editEngineConfiguration = $config;

	// This is mostly making sure that we fill in default values.
	$this->setIsCreate(true);

	return $this->buildEditFields($object);
	}

	final protected function buildEditFields($object) {
	$viewer = $this->getViewer();

	$fields = $this->buildCustomEditFields($object);

	foreach ($fields as $field) {
	$field
	->setViewer($viewer)
	->setObject($object);
	}

	$fields = mpull($fields, null, 'getKey');

	if ($this->isEngineExtensible()) {
	$extensions = PhabricatorEditEngineExtension::getAllEnabledExtensions();
	} else {
	$extensions = array();
	}

	foreach ($extensions as $extension) {
	$extension->setViewer($viewer);

	if (!$extension->supportsObject($this, $object)) {
	continue;
	}

	$extension_fields = $extension->buildCustomEditFields($this, $object);

	// TODO: Validate this in more detail with a more tailored error.
	assert_instances_of($extension_fields, 'PhabricatorEditField');

	foreach ($extension_fields as $field) {
	$field
	->setViewer($viewer)
	->setObject($object);
	}

	$extension_fields = mpull($extension_fields, null, 'getKey');

	foreach ($extension_fields as $key => $field) {
	$fields[$key] = $field;
	}
	}

	$config = $this->getEditEngineConfiguration();
	$fields = $this->willConfigureFields($object, $fields);
	$fields = $config->applyConfigurationToFields($this, $object, $fields);

	$fields = $this->applyPageToFields($object, $fields);

	return $fields;
	}

	protected function willConfigureFields($object, array $fields) {
	return $fields;
	}


	/* -( Display Text )------------------------------------------------------- */


	/**
	* @task text
	*/
	abstract public function getEngineName();


	/**
	* @task text
	*/
	abstract protected function getObjectCreateTitleText($object);

	/**
	* @task text
	*/
	protected function getFormHeaderText($object) {
	$config = $this->getEditEngineConfiguration();
	return $config->getName();
	}

	/**
	* @task text
	*/
	abstract protected function getObjectEditTitleText($object);


	/**
	* @task text
	*/
	abstract protected function getObjectCreateShortText();


	/**
	* @task text
	*/
	abstract protected function getObjectName();


	/**
	* @task text
	*/
	abstract protected function getObjectEditShortText($object);


	/**
	* @task text
	*/
	protected function getObjectCreateButtonText($object) {
	return $this->getObjectCreateTitleText($object);
	}


	/**
	* @task text
	*/
	protected function getObjectEditButtonText($object) {
	return pht('Save Changes');
	}


	/**
	* @task text
	*/
	protected function getCommentViewSeriousHeaderText($object) {
	return pht('Take Action');
	}


	/**
	* @task text
	*/
	protected function getCommentViewSeriousButtonText($object) {
	return pht('Submit');
	}


	/**
	* @task text
	*/
	protected function getCommentViewHeaderText($object) {
	return $this->getCommentViewSeriousHeaderText($object);
	}


	/**
	* @task text
	*/
	protected function getCommentViewButtonText($object) {
	return $this->getCommentViewSeriousButtonText($object);
	}


	/**
	* @task text
	*/
	protected function getQuickCreateMenuHeaderText() {
	return $this->getObjectCreateShortText();
	}


	/**
	* Return a human-readable header describing what this engine is used to do,
	* like "Configure Maniphest Task Forms".
	*
	* @return string Human-readable description of the engine.
	* @task text
	*/
	abstract public function getSummaryHeader();


	/**
	* Return a human-readable summary of what this engine is used to do.
	*
	* @return string Human-readable description of the engine.
	* @task text
	*/
	abstract public function getSummaryText();




	/* -( Edit Engine Configuration )------------------------------------------ */


	protected function supportsEditEngineConfiguration() {
	return true;
	}

	final protected function getEditEngineConfiguration() {
	return $this->editEngineConfiguration;
	}

	private function newConfigurationQuery() {
	return id(new PhabricatorEditEngineConfigurationQuery())
	->setViewer($this->getViewer())
	->withEngineKeys(array($this->getEngineKey()));
	}

	private function loadEditEngineConfigurationWithQuery(
	PhabricatorEditEngineConfigurationQuery $query,
	$sort_method) {

	if ($sort_method) {
	$results = $query->execute();
	$results = msort($results, $sort_method);
	$result = head($results);
	} else {
	$result = $query->executeOne();
	}

	if (!$result) {
	return null;
	}

	$this->editEngineConfiguration = $result;
	return $result;
	}

	private function loadEditEngineConfigurationWithIdentifier($identifier) {
	$query = $this->newConfigurationQuery()
	->withIdentifiers(array($identifier));

	return $this->loadEditEngineConfigurationWithQuery($query, null);
	}

	private function loadDefaultConfiguration() {
	$query = $this->newConfigurationQuery()
	->withIdentifiers(
	array(
	self::EDITENGINECONFIG_DEFAULT,
	))
	->withIgnoreDatabaseConfigurations(true);

	return $this->loadEditEngineConfigurationWithQuery($query, null);
	}

	private function loadDefaultCreateConfiguration() {
	$query = $this->newConfigurationQuery()
	->withIsDefault(true)
	->withIsDisabled(false);

	return $this->loadEditEngineConfigurationWithQuery(
	$query,
	'getCreateSortKey');
	}

	public function loadDefaultEditConfiguration() {
	$query = $this->newConfigurationQuery()
	->withIsEdit(true)
	->withIsDisabled(false);

	return $this->loadEditEngineConfigurationWithQuery(
	$query,
	'getEditSortKey');
	}

	final public function getBuiltinEngineConfigurations() {
	$configurations = $this->newBuiltinEngineConfigurations();

	if (!$configurations) {
	throw new Exception(
	pht(
	'EditEngine ("%s") returned no builtin engine configurations, but '.
	'an edit engine must have at least one configuration.',
	get_class($this)));
	}

	assert_instances_of($configurations, 'PhabricatorEditEngineConfiguration');

	$has_default = false;
	foreach ($configurations as $config) {
	if ($config->getBuiltinKey() == self::EDITENGINECONFIG_DEFAULT) {
	$has_default = true;
	}
	}

	if (!$has_default) {
	$first = head($configurations);
	if (!$first->getBuiltinKey()) {
	$first
	->setBuiltinKey(self::EDITENGINECONFIG_DEFAULT)
	->setIsDefault(true)
	->setIsEdit(true);

	if (!strlen($first->getName())) {
	$first->setName($this->getObjectCreateShortText());
	}
	} else {
	throw new Exception(
	pht(
	'EditEngine ("%s") returned builtin engine configurations, '.
	'but none are marked as default and the first configuration has '.
	'a different builtin key already. Mark a builtin as default or '.
	'omit the key from the first configuration',
	get_class($this)));
	}
	}

	$builtins = array();
	foreach ($configurations as $key => $config) {
	$builtin_key = $config->getBuiltinKey();

	if ($builtin_key === null) {
	throw new Exception(
	pht(
	'EditEngine ("%s") returned builtin engine configurations, '.
	'but one (with key "%s") is missing a builtin key. Provide a '.
	'builtin key for each configuration (you can omit it from the '.
	'first configuration in the list to automatically assign the '.
	'default key).',
	get_class($this),
	$key));
	}

	if (isset($builtins[$builtin_key])) {
	throw new Exception(
	pht(
	'EditEngine ("%s") returned builtin engine configurations, '.
	'but at least two specify the same builtin key ("%s"). Engines '.
	'must have unique builtin keys.',
	get_class($this),
	$builtin_key));
	}

	$builtins[$builtin_key] = $config;
	}


	return $builtins;
	}

	protected function newBuiltinEngineConfigurations() {
	return array(
	$this->newConfiguration(),
	);
	}

	final protected function newConfiguration() {
	return PhabricatorEditEngineConfiguration::initializeNewConfiguration(
	$this->getViewer(),
	$this);
	}


	/* -( Managing URIs )------------------------------------------------------ */


	/**
	* @task uri
	*/
	abstract protected function getObjectViewURI($object);


	/**
	* @task uri
	*/
	protected function getObjectCreateCancelURI($object) {
	return $this->getApplication()->getApplicationURI();
	}


	/**
	* @task uri
	*/
	protected function getEditorURI() {
	return $this->getApplication()->getApplicationURI('edit/');
	}


	/**
	* @task uri
	*/
	protected function getObjectEditCancelURI($object) {
	return $this->getObjectViewURI($object);
	}


	/**
	* @task uri
	*/
	public function getEditURI($object = null, $path = null) {
	$parts = array();

	$parts[] = $this->getEditorURI();

	if ($object && $object->getID()) {
	$parts[] = $object->getID().'/';
	}

	if ($path !== null) {
	$parts[] = $path;
	}

	return implode('', $parts);
	}

	public function getEffectiveObjectViewURI($object) {
	if ($this->getIsCreate()) {
	return $this->getObjectViewURI($object);
	}

	$page = $this->getSelectedPage();
	if ($page) {
	$view_uri = $page->getViewURI();
	if ($view_uri !== null) {
	return $view_uri;
	}
	}

	return $this->getObjectViewURI($object);
	}

	public function getEffectiveObjectEditCancelURI($object) {
	$page = $this->getSelectedPage();
	if ($page) {
	$view_uri = $page->getViewURI();
	if ($view_uri !== null) {
	return $view_uri;
	}
	}

	return $this->getObjectEditCancelURI($object);
	}


	/* -( Creating and Loading Objects )--------------------------------------- */


	/**
	* Initialize a new object for creation.
	*
	* @return object Newly initialized object.
	* @task load
	*/
	abstract protected function newEditableObject();


	/**
	* Build an empty query for objects.
	*
	* @return PhabricatorPolicyAwareQuery Query.
	* @task load
	*/
	abstract protected function newObjectQuery();


	/**
	* Test if this workflow is creating a new object or editing an existing one.
	*
	* @return bool True if a new object is being created.
	* @task load
	*/
	final public function getIsCreate() {
	return $this->isCreate;
	}


	/**
	* Flag this workflow as a create or edit.
	*
	* @param bool True if this is a create workflow.
	* @return this
	* @task load
	*/
	private function setIsCreate($is_create) {
	$this->isCreate = $is_create;
	return $this;
	}


	/**
	* Try to load an object by ID, PHID, or monogram. This is done primarily
	* to make Conduit a little easier to use.
	*
	* @param wild ID, PHID, or monogram.
	* @param list<const> List of required capability constants, or omit for
	* defaults.
	* @return object Corresponding editable object.
	* @task load
	*/
	private function newObjectFromIdentifier(
	$identifier,
	array $capabilities = array()) {
	if (is_int($identifier) \|\| ctype_digit($identifier)) {
	$object = $this->newObjectFromID($identifier, $capabilities);

	if (!$object) {
	throw new Exception(
	pht(
	'No object exists with ID "%s".',
	$identifier));
	}

	return $object;
	}

	$type_unknown = PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN;
	if (phid_get_type($identifier) != $type_unknown) {
	$object = $this->newObjectFromPHID($identifier, $capabilities);

	if (!$object) {
	throw new Exception(
	pht(
	'No object exists with PHID "%s".',
	$identifier));
	}

	return $object;
	}

	$target = id(new PhabricatorObjectQuery())
	->setViewer($this->getViewer())
	->withNames(array($identifier))
	->executeOne();
	if (!$target) {
	throw new Exception(
	pht(
	'Monogram "%s" does not identify a valid object.',
	$identifier));
	}

	$expect = $this->newEditableObject();
	$expect_class = get_class($expect);
	$target_class = get_class($target);
	if ($expect_class !== $target_class) {
	throw new Exception(
	pht(
	'Monogram "%s" identifies an object of the wrong type. Loaded '.
	'object has class "%s", but this editor operates on objects of '.
	'type "%s".',
	$identifier,
	$target_class,
	$expect_class));
	}

	// Load the object by PHID using this engine's standard query. This makes
	// sure it's really valid, goes through standard policy check logic, and
	// picks up any `need...()` clauses we want it to load with.

	$object = $this->newObjectFromPHID($target->getPHID(), $capabilities);
	if (!$object) {
	throw new Exception(
	pht(
	'Failed to reload object identified by monogram "%s" when '.
	'querying by PHID.',
	$identifier));
	}

	return $object;
	}

	/**
	* Load an object by ID.
	*
	* @param int Object ID.
	* @param list<const> List of required capability constants, or omit for
	* defaults.
	* @return object\|null Object, or null if no such object exists.
	* @task load
	*/
	private function newObjectFromID($id, array $capabilities = array()) {
	$query = $this->newObjectQuery()
	->withIDs(array($id));

	return $this->newObjectFromQuery($query, $capabilities);
	}


	/**
	* Load an object by PHID.
	*
	* @param phid Object PHID.
	* @param list<const> List of required capability constants, or omit for
	* defaults.
	* @return object\|null Object, or null if no such object exists.
	* @task load
	*/
	private function newObjectFromPHID($phid, array $capabilities = array()) {
	$query = $this->newObjectQuery()
	->withPHIDs(array($phid));

	return $this->newObjectFromQuery($query, $capabilities);
	}


	/**
	* Load an object given a configured query.
	*
	* @param PhabricatorPolicyAwareQuery Configured query.
	* @param list<const> List of required capabilitiy constants, or omit for
	* defaults.
	* @return object\|null Object, or null if no such object exists.
	* @task load
	*/
	private function newObjectFromQuery(
	PhabricatorPolicyAwareQuery $query,
	array $capabilities = array()) {

	$viewer = $this->getViewer();

	if (!$capabilities) {
	$capabilities = array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	$object = $query
	->setViewer($viewer)
	->requireCapabilities($capabilities)
	->executeOne();
	if (!$object) {
	return null;
	}

	return $object;
	}


	/**
	* Verify that an object is appropriate for editing.
	*
	* @param wild Loaded value.
	* @return void
	* @task load
	*/
	private function validateObject($object) {
	if (!$object \|\| !is_object($object)) {
	throw new Exception(
	pht(
	'EditEngine "%s" created or loaded an invalid object: object must '.
	'actually be an object, but is of some other type ("%s").',
	get_class($this),
	gettype($object)));
	}

	if (!($object instanceof PhabricatorApplicationTransactionInterface)) {
	throw new Exception(
	pht(
	'EditEngine "%s" created or loaded an invalid object: object (of '.
	'class "%s") must implement "%s", but does not.',
	get_class($this),
	get_class($object),
	'PhabricatorApplicationTransactionInterface'));
	}
	}


	/* -( Responding to Web Requests )----------------------------------------- */


	final public function buildResponse() {
	$viewer = $this->getViewer();
	$controller = $this->getController();
	$request = $controller->getRequest();

	$action = $request->getURIData('editAction');

	$capabilities = array();
	$use_default = false;
	$require_create = true;
	switch ($action) {
	case 'comment':
	$capabilities = array(
	PhabricatorPolicyCapability::CAN_VIEW,
	);
	$use_default = true;
	break;
	case 'parameters':
	$use_default = true;
	break;
	case 'nodefault':
	case 'nocreate':
	case 'nomanage':
	$require_create = false;
	break;
	default:
	break;
	}

	$object = $this->getTargetObject();
	if (!$object) {
	$id = $request->getURIData('id');

	if ($id) {
	$this->setIsCreate(false);
	$object = $this->newObjectFromID($id, $capabilities);
	if (!$object) {
	return new Aphront404Response();
	}
	} else {
	// Make sure the viewer has permission to create new objects of
	// this type if we're going to create a new object.
	if ($require_create) {
	$this->requireCreateCapability();
	}

	$this->setIsCreate(true);
	$object = $this->newEditableObject();
	}
	} else {
	$id = $object->getID();
	}

	$this->validateObject($object);

	if ($use_default) {
	$config = $this->loadDefaultConfiguration();
	if (!$config) {
	return new Aphront404Response();
	}
	} else {
	$form_key = $request->getURIData('formKey');
	if (strlen($form_key)) {
	$config = $this->loadEditEngineConfigurationWithIdentifier($form_key);

	if (!$config) {
	return new Aphront404Response();
	}

	if ($id && !$config->getIsEdit()) {
	return $this->buildNotEditFormRespose($object, $config);
	}
	} else {
	if ($id) {
	$config = $this->loadDefaultEditConfiguration();
	if (!$config) {
	return $this->buildNoEditResponse($object);
	}
	} else {
	$config = $this->loadDefaultCreateConfiguration();
	if (!$config) {
	return $this->buildNoCreateResponse($object);
	}
	}
	}
	}

	if ($config->getIsDisabled()) {
	return $this->buildDisabledFormResponse($object, $config);
	}

	$page_key = $request->getURIData('pageKey');
	if (!strlen($page_key)) {
	$pages = $this->getPages($object);
	if ($pages) {
	$page_key = head_key($pages);
	}
	}

	if (strlen($page_key)) {
	$page = $this->selectPage($object, $page_key);
	if (!$page) {
	return new Aphront404Response();
	}
	}

	switch ($action) {
	case 'parameters':
	return $this->buildParametersResponse($object);
	case 'nodefault':
	return $this->buildNoDefaultResponse($object);
	case 'nocreate':
	return $this->buildNoCreateResponse($object);
	case 'nomanage':
	return $this->buildNoManageResponse($object);
	case 'comment':
	return $this->buildCommentResponse($object);
	default:
	return $this->buildEditResponse($object);
	}
	}

	private function buildCrumbs($object, $final = false) {
	$controller = $this->getController();

	$crumbs = $controller->buildApplicationCrumbsForEditEngine();
	if ($this->getIsCreate()) {
	$create_text = $this->getObjectCreateShortText();
	if ($final) {
	$crumbs->addTextCrumb($create_text);
	} else {
	$edit_uri = $this->getEditURI($object);
	$crumbs->addTextCrumb($create_text, $edit_uri);
	}
	} else {
	$crumbs->addTextCrumb(
	$this->getObjectEditShortText($object),
	$this->getEffectiveObjectViewURI($object));

	$edit_text = pht('Edit');
	if ($final) {
	$crumbs->addTextCrumb($edit_text);
	} else {
	$edit_uri = $this->getEditURI($object);
	$crumbs->addTextCrumb($edit_text, $edit_uri);
	}
	}

	return $crumbs;
	}

	private function buildEditResponse($object) {
	$viewer = $this->getViewer();
	$controller = $this->getController();
	$request = $controller->getRequest();

	$fields = $this->buildEditFields($object);
	$template = $object->getApplicationTransactionTemplate();

	$validation_exception = null;
	if ($request->isFormPost() && $request->getBool('editEngine')) {
	$submit_fields = $fields;

	foreach ($submit_fields as $key => $field) {
	if (!$field->shouldGenerateTransactionsFromSubmit()) {
	unset($submit_fields[$key]);
	continue;
	}
	}

	// Before we read the submitted values, store a copy of what we would
	// use if the form was empty so we can figure out which transactions are
	// just setting things to their default values for the current form.
	$defaults = array();
	foreach ($submit_fields as $key => $field) {
	$defaults[$key] = $field->getValueForTransaction();
	}

	foreach ($submit_fields as $key => $field) {
	$field->setIsSubmittedForm(true);

	if (!$field->shouldReadValueFromSubmit()) {
	continue;
	}

	$field->readValueFromSubmit($request);
	}

	$xactions = array();

	if ($this->getIsCreate()) {
	$xactions[] = id(clone $template)
	->setTransactionType(PhabricatorTransactions::TYPE_CREATE);
	}

	foreach ($submit_fields as $key => $field) {
	$field_value = $field->getValueForTransaction();

	$type_xactions = $field->generateTransactions(
	clone $template,
	array(
	'value' => $field_value,
	));

	foreach ($type_xactions as $type_xaction) {
	$default = $defaults[$key];

	if ($default === $field->getValueForTransaction()) {
	$type_xaction->setIsDefaultTransaction(true);
	}

	$xactions[] = $type_xaction;
	}
	}

	$editor = $object->getApplicationTransactionEditor()
	->setActor($viewer)
	->setContentSourceFromRequest($request)
	->setContinueOnNoEffect(true);

	try {

	$editor->applyTransactions($object, $xactions);

	return $this->newEditResponse($request, $object, $xactions);
	} catch (PhabricatorApplicationTransactionValidationException $ex) {
	$validation_exception = $ex;

	foreach ($fields as $field) {
	$xaction_type = $field->getTransactionType();
	if ($xaction_type === null) {
	continue;
	}

	$message = $ex->getShortMessage($xaction_type);
	if ($message === null) {
	continue;
	}

	$field->setControlError($message);
	}
	}
	} else {
	if ($this->getIsCreate()) {
	$template = $request->getStr('template');

	if (strlen($template)) {
	$template_object = $this->newObjectFromIdentifier(
	$template,
	array(
	PhabricatorPolicyCapability::CAN_VIEW,
	));
	if (!$template_object) {
	return new Aphront404Response();
	}
	} else {
	$template_object = null;
	}

	if ($template_object) {
	$copy_fields = $this->buildEditFields($template_object);
	$copy_fields = mpull($copy_fields, null, 'getKey');
	foreach ($copy_fields as $copy_key => $copy_field) {
	if (!$copy_field->getIsCopyable()) {
	unset($copy_fields[$copy_key]);
	}
	}
	} else {
	$copy_fields = array();
	}

	foreach ($fields as $field) {
	if (!$field->shouldReadValueFromRequest()) {
	continue;
	}

	$field_key = $field->getKey();
	if (isset($copy_fields[$field_key])) {
	$field->readValueFromField($copy_fields[$field_key]);
	}

	$field->readValueFromRequest($request);
	}
	}
	}

	$action_button = $this->buildEditFormActionButton($object);

	if ($this->getIsCreate()) {
	$header_text = $this->getFormHeaderText($object);
	$header_icon = 'fa-plus-square';
	} else {
	$header_text = $this->getObjectEditTitleText($object);
	$header_icon = 'fa-pencil';
	}

	$show_preview = !$request->isAjax();

	if ($show_preview) {
	$previews = array();
	foreach ($fields as $field) {
	$preview = $field->getPreviewPanel();
	if (!$preview) {
	continue;
	}

	$control_id = $field->getControlID();

	$preview
	->setControlID($control_id)
	->setPreviewURI('/transactions/remarkuppreview/');

	$previews[] = $preview;
	}
	} else {
	$previews = array();
	}

	$form = $this->buildEditForm($object, $fields);

	if ($request->isAjax()) {
	if ($this->getIsCreate()) {
	$cancel_uri = $this->getObjectCreateCancelURI($object);
	$submit_button = $this->getObjectCreateButtonText($object);
	} else {
	$cancel_uri = $this->getEffectiveObjectEditCancelURI($object);
	$submit_button = $this->getObjectEditButtonText($object);
	}

	return $this->getController()
	->newDialog()
	->setWidth(AphrontDialogView::WIDTH_FULL)
	->setTitle($header_text)
	->setValidationException($validation_exception)
	->appendForm($form)
	->addCancelButton($cancel_uri)
	->addSubmitButton($submit_button);
	}

	$header = id(new PHUIHeaderView())
	->setHeader($header_text)
	->setHeaderIcon($header_icon);

	if ($action_button) {
	$header->addActionLink($action_button);
	}

	$crumbs = $this->buildCrumbs($object, $final = true);
	$crumbs->setBorder(true);

	$box = id(new PHUIObjectBoxView())
	->setUser($viewer)
	->setHeaderText($this->getObjectName())
	->setValidationException($validation_exception)
	->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
	->appendChild($form);

	$view = id(new PHUITwoColumnView())
	->setHeader($header)
	->setFooter(array(
	$box,
	$previews,
	));

	return $controller->newPage()
	->setTitle($header_text)
	->setCrumbs($crumbs)
	->appendChild($view);
	}

	protected function newEditResponse(
	AphrontRequest $request,
	$object,
	array $xactions) {
	return id(new AphrontRedirectResponse())
	->setURI($this->getEffectiveObjectViewURI($object));
	}

	private function buildEditForm($object, array $fields) {
	$viewer = $this->getViewer();
	$controller = $this->getController();
	$request = $controller->getRequest();

	$form = id(new AphrontFormView())
	->setUser($viewer)
	->addHiddenInput('editEngine', 'true');

	foreach ($this->contextParameters as $param) {
	$form->addHiddenInput($param, $request->getStr($param));
	}

	foreach ($fields as $field) {
	$field->appendToForm($form);
	}

	if ($this->getIsCreate()) {
	$cancel_uri = $this->getObjectCreateCancelURI($object);
	$submit_button = $this->getObjectCreateButtonText($object);
	} else {
	$cancel_uri = $this->getEffectiveObjectEditCancelURI($object);
	$submit_button = $this->getObjectEditButtonText($object);
	}

	if (!$request->isAjax()) {
	$form->appendControl(
	id(new AphrontFormSubmitControl())
	->addCancelButton($cancel_uri)
	->setValue($submit_button));
	}

	return $form;
	}

	private function buildEditFormActionButton($object) {
	if (!$this->isEngineConfigurable()) {
	return null;
	}

	$viewer = $this->getViewer();

	$action_view = id(new PhabricatorActionListView())
	->setUser($viewer);

	foreach ($this->buildEditFormActions($object) as $action) {
	$action_view->addAction($action);
	}

	$action_button = id(new PHUIButtonView())
	->setTag('a')
	->setText(pht('Configure Form'))
	->setHref('#')
	->setIcon('fa-gear')
	->setDropdownMenu($action_view);

	return $action_button;
	}

	private function buildEditFormActions($object) {
	$actions = array();

	if ($this->supportsEditEngineConfiguration()) {
	$engine_key = $this->getEngineKey();
	$config = $this->getEditEngineConfiguration();

	$can_manage = PhabricatorPolicyFilter::hasCapability(
	$this->getViewer(),
	$config,
	PhabricatorPolicyCapability::CAN_EDIT);

	if ($can_manage) {
	$manage_uri = $config->getURI();
	} else {
	$manage_uri = $this->getEditURI(null, 'nomanage/');
	}

	$view_uri = "/transactions/editengine/{$engine_key}/";

	$actions[] = id(new PhabricatorActionView())
	->setLabel(true)
	->setName(pht('Configuration'));

	$actions[] = id(new PhabricatorActionView())
	->setName(pht('View Form Configurations'))
	->setIcon('fa-list-ul')
	->setHref($view_uri);

	$actions[] = id(new PhabricatorActionView())
	->setName(pht('Edit Form Configuration'))
	->setIcon('fa-pencil')
	->setHref($manage_uri)
	->setDisabled(!$can_manage)
	->setWorkflow(!$can_manage);
	}

	$actions[] = id(new PhabricatorActionView())
	->setLabel(true)
	->setName(pht('Documentation'));

	$actions[] = id(new PhabricatorActionView())
	->setName(pht('Using HTTP Parameters'))
	->setIcon('fa-book')
	->setHref($this->getEditURI($object, 'parameters/'));

	$doc_href = PhabricatorEnv::getDoclink('User Guide: Customizing Forms');
	$actions[] = id(new PhabricatorActionView())
	->setName(pht('User Guide: Customizing Forms'))
	->setIcon('fa-book')
	->setHref($doc_href);

	return $actions;
	}


	/**
	* Test if the viewer could apply a certain type of change by using the
	* normal "Edit" form.
	*
	* This method returns `true` if the user has access to an edit form and
	* that edit form has a field which applied the specified transaction type,
	* and that field is visible and editable for the user.
	*
	* For example, you can use it to test if a user is able to reassign tasks
	* or not, prior to rendering dedicated UI for task reassingment.
	*
	* Note that this method does NOT test if the user can actually edit the
	* current object, just if they have access to the related field.
	*
	* @param const Transaction type to test for.
	* @return bool True if the user could "Edit" to apply the transaction type.
	*/
	final public function hasEditAccessToTransaction($xaction_type) {
	$viewer = $this->getViewer();

	$config = $this->loadDefaultEditConfiguration();
	if (!$config) {
	return false;
	}

	$object = $this->getTargetObject();
	if (!$object) {
	$object = $this->newEditableObject();
	}

	$fields = $this->buildEditFields($object);

	$field = null;
	foreach ($fields as $form_field) {
	$field_xaction_type = $form_field->getTransactionType();
	if ($field_xaction_type === $xaction_type) {
	$field = $form_field;
	break;
	}
	}

	if (!$field) {
	return false;
	}

	if (!$field->shouldReadValueFromSubmit()) {
	return false;
	}

	return true;
	}


	final public function addActionToCrumbs(PHUICrumbsView $crumbs) {
	$viewer = $this->getViewer();

	$can_create = $this->hasCreateCapability();
	if ($can_create) {
	$configs = $this->loadUsableConfigurationsForCreate();
	} else {
	$configs = array();
	}

	$dropdown = null;
	$disabled = false;
	$workflow = false;

	$menu_icon = 'fa-plus-square';

	if (!$configs) {
	if ($viewer->isLoggedIn()) {
	$disabled = true;
	} else {
	// If the viewer isn't logged in, assume they'll get hit with a login
	// dialog and are likely able to create objects after they log in.
	$disabled = false;
	}
	$workflow = true;

	if ($can_create) {
	$create_uri = $this->getEditURI(null, 'nodefault/');
	} else {
	$create_uri = $this->getEditURI(null, 'nocreate/');
	}
	} else {
	$config = head($configs);
	$form_key = $config->getIdentifier();
	$create_uri = $this->getEditURI(null, "form/{$form_key}/");

	if (count($configs) > 1) {
	$menu_icon = 'fa-caret-square-o-down';

	$dropdown = id(new PhabricatorActionListView())
	->setUser($viewer);

	foreach ($configs as $config) {
	$form_key = $config->getIdentifier();
	$config_uri = $this->getEditURI(null, "form/{$form_key}/");

	$item_icon = 'fa-plus';

	$dropdown->addAction(
	id(new PhabricatorActionView())
	->setName($config->getDisplayName())
	->setIcon($item_icon)
	->setHref($config_uri));
	}
	}
	}

	$action = id(new PHUIListItemView())
	->setName($this->getObjectCreateShortText())
	->setHref($create_uri)
	->setIcon($menu_icon)
	->setWorkflow($workflow)
	->setDisabled($disabled);

	if ($dropdown) {
	$action->setDropdownMenu($dropdown);
	}

	$crumbs->addAction($action);
	}

	final public function buildEditEngineCommentView($object) {
	$config = $this->loadDefaultEditConfiguration();

	if (!$config) {
	// TODO: This just nukes the entire comment form if you don't have access
	// to any edit forms. We might want to tailor this UX a bit.
	return id(new PhabricatorApplicationTransactionCommentView())
	->setNoPermission(true);
	}

	$viewer = $this->getViewer();
	$object_phid = $object->getPHID();

	$is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');

	if ($is_serious) {
	$header_text = $this->getCommentViewSeriousHeaderText($object);
	$button_text = $this->getCommentViewSeriousButtonText($object);
	} else {
	$header_text = $this->getCommentViewHeaderText($object);
	$button_text = $this->getCommentViewButtonText($object);
	}

	$comment_uri = $this->getEditURI($object, 'comment/');

	$view = id(new PhabricatorApplicationTransactionCommentView())
	->setUser($viewer)
	->setObjectPHID($object_phid)
	->setHeaderText($header_text)
	->setAction($comment_uri)
	->setSubmitButtonName($button_text);

	$draft = PhabricatorVersionedDraft::loadDraft(
	$object_phid,
	$viewer->getPHID());
	if ($draft) {
	$view->setVersionedDraft($draft);
	}

	$view->setCurrentVersion($this->loadDraftVersion($object));

	$fields = $this->buildEditFields($object);

	$comment_actions = array();
	foreach ($fields as $field) {
	if (!$field->shouldGenerateTransactionsFromComment()) {
	continue;
	}

	$comment_action = $field->getCommentAction();
	if (!$comment_action) {
	continue;
	}

	$key = $comment_action->getKey();

	// TODO: Validate these better.

	$comment_actions[$key] = $comment_action;
	}

	$comment_actions = msortv($comment_actions, 'getSortVector');

	$view->setCommentActions($comment_actions);

	return $view;
	}

	protected function loadDraftVersion($object) {
	$viewer = $this->getViewer();

	if (!$viewer->isLoggedIn()) {
	return null;
	}

	$template = $object->getApplicationTransactionTemplate();
	$conn_r = $template->establishConnection('r');

	// Find the most recent transaction the user has written. We'll use this
	// as a version number to make sure that out-of-date drafts get discarded.
	$result = queryfx_one(
	$conn_r,
	'SELECT id AS version FROM %T
	WHERE objectPHID = %s AND authorPHID = %s
	ORDER BY id DESC LIMIT 1',
	$template->getTableName(),
	$object->getPHID(),
	$viewer->getPHID());

	if ($result) {
	return (int)$result['version'];
	} else {
	return null;
	}
	}


	/* -( Responding to HTTP Parameter Requests )------------------------------ */


	/**
	* Respond to a request for documentation on HTTP parameters.
	*
	* @param object Editable object.
	* @return AphrontResponse Response object.
	* @task http
	*/
	private function buildParametersResponse($object) {
	$controller = $this->getController();
	$viewer = $this->getViewer();
	$request = $controller->getRequest();
	$fields = $this->buildEditFields($object);

	$crumbs = $this->buildCrumbs($object);
	$crumbs->addTextCrumb(pht('HTTP Parameters'));
	$crumbs->setBorder(true);

	$header_text = pht(
	'HTTP Parameters: %s',
	$this->getObjectCreateShortText());

	$header = id(new PHUIHeaderView())
	->setHeader($header_text);

	$help_view = id(new PhabricatorApplicationEditHTTPParameterHelpView())
	->setUser($viewer)
	->setFields($fields);

	$document = id(new PHUIDocumentViewPro())
	->setUser($viewer)
	->setHeader($header)
	->appendChild($help_view);

	return $controller->newPage()
	->setTitle(pht('HTTP Parameters'))
	->setCrumbs($crumbs)
	->appendChild($document);
	}


	private function buildError($object, $title, $body) {
	$cancel_uri = $this->getObjectCreateCancelURI($object);

	return $this->getController()
	->newDialog()
	->setTitle($title)
	->appendParagraph($body)
	->addCancelButton($cancel_uri);
	}


	private function buildNoDefaultResponse($object) {
	return $this->buildError(
	$object,
	pht('No Default Create Forms'),
	pht(
	'This application is not configured with any forms for creating '.
	'objects that are visible to you and enabled.'));
	}

	private function buildNoCreateResponse($object) {
	return $this->buildError(
	$object,
	pht('No Create Permission'),
	pht('You do not have permission to create these objects.'));
	}

	private function buildNoManageResponse($object) {
	return $this->buildError(
	$object,
	pht('No Manage Permission'),
	pht(
	'You do not have permission to configure forms for this '.
	'application.'));
	}

	private function buildNoEditResponse($object) {
	return $this->buildError(
	$object,
	pht('No Edit Forms'),
	pht(
	'You do not have access to any forms which are enabled and marked '.
	'as edit forms.'));
	}

	private function buildNotEditFormRespose($object, $config) {
	return $this->buildError(
	$object,
	pht('Not an Edit Form'),
	pht(
	'This form ("%s") is not marked as an edit form, so '.
	'it can not be used to edit objects.',
	$config->getName()));
	}

	private function buildDisabledFormResponse($object, $config) {
	return $this->buildError(
	$object,
	pht('Form Disabled'),
	pht(
	'This form ("%s") has been disabled, so it can not be used.',
	$config->getName()));
	}

	private function buildCommentResponse($object) {
	$viewer = $this->getViewer();

	if ($this->getIsCreate()) {
	return new Aphront404Response();
	}

	$controller = $this->getController();
	$request = $controller->getRequest();

	if (!$request->isFormPost()) {
	return new Aphront400Response();
	}

	$config = $this->loadDefaultEditConfiguration();
	if (!$config) {
	return new Aphront404Response();
	}

	$fields = $this->buildEditFields($object);

	$is_preview = $request->isPreviewRequest();
	$view_uri = $this->getEffectiveObjectViewURI($object);

	$template = $object->getApplicationTransactionTemplate();
	$comment_template = $template->getApplicationTransactionCommentObject();

	$comment_text = $request->getStr('comment');

	$actions = $request->getStr('editengine.actions');
	if ($actions) {
	$actions = phutil_json_decode($actions);
	}

	if ($is_preview) {
	$version_key = PhabricatorVersionedDraft::KEY_VERSION;
	$request_version = $request->getInt($version_key);
	$current_version = $this->loadDraftVersion($object);
	if ($request_version >= $current_version) {
	$draft = PhabricatorVersionedDraft::loadOrCreateDraft(
	$object->getPHID(),
	$viewer->getPHID(),
	$current_version);

	$draft
	->setProperty('comment', $comment_text)
	->setProperty('actions', $actions)
	->save();
	}
	}

	$xactions = array();

	if ($actions) {
	$action_map = array();
	foreach ($actions as $action) {
	$type = idx($action, 'type');
	if (!$type) {
	continue;
	}

	if (empty($fields[$type])) {
	continue;
	}

	$action_map[$type] = $action;
	}

	foreach ($action_map as $type => $action) {
	$field = $fields[$type];

	if (!$field->shouldGenerateTransactionsFromComment()) {
	continue;
	}

	if (array_key_exists('initialValue', $action)) {
	$field->setInitialValue($action['initialValue']);
	}

	$field->readValueFromComment(idx($action, 'value'));

	$type_xactions = $field->generateTransactions(
	clone $template,
	array(
	'value' => $field->getValueForTransaction(),
	));
	foreach ($type_xactions as $type_xaction) {
	$xactions[] = $type_xaction;
	}
	}
	}

	if (strlen($comment_text) \|\| !$xactions) {
	$xactions[] = id(clone $template)
	->setTransactionType(PhabricatorTransactions::TYPE_COMMENT)
	->attachComment(
	id(clone $comment_template)
	->setContent($comment_text));
	}

	$editor = $object->getApplicationTransactionEditor()
	->setActor($viewer)
	->setContinueOnNoEffect($request->isContinueRequest())
	->setContinueOnMissingFields(true)
	->setContentSourceFromRequest($request)
	->setIsPreview($is_preview);

	try {
	$xactions = $editor->applyTransactions($object, $xactions);
	} catch (PhabricatorApplicationTransactionNoEffectException $ex) {
	return id(new PhabricatorApplicationTransactionNoEffectResponse())
	->setCancelURI($view_uri)
	->setException($ex);
	}

	if (!$is_preview) {
	PhabricatorVersionedDraft::purgeDrafts(
	$object->getPHID(),
	$viewer->getPHID(),
	$this->loadDraftVersion($object));
	}

	if ($request->isAjax() && $is_preview) {
	return id(new PhabricatorApplicationTransactionResponse())
	->setViewer($viewer)
	->setTransactions($xactions)
	->setIsPreview($is_preview);
	} else {
	return id(new AphrontRedirectResponse())
	->setURI($view_uri);
	}
	}


	/* -( Conduit )------------------------------------------------------------ */


	/**
	* Respond to a Conduit edit request.
	*
	* This method accepts a list of transactions to apply to an object, and
	* either edits an existing object or creates a new one.
	*
	* @task conduit
	*/
	final public function buildConduitResponse(ConduitAPIRequest $request) {
	$viewer = $this->getViewer();

	$config = $this->loadDefaultConfiguration();
	if (!$config) {
	throw new Exception(
	pht(
	'Unable to load configuration for this EditEngine ("%s").',
	get_class($this)));
	}

	$identifier = $request->getValue('objectIdentifier');
	if ($identifier) {
	$this->setIsCreate(false);
	$object = $this->newObjectFromIdentifier($identifier);
	} else {
	$this->requireCreateCapability();

	$this->setIsCreate(true);
	$object = $this->newEditableObject();
	}

	$this->validateObject($object);

	$fields = $this->buildEditFields($object);

	$types = $this->getConduitEditTypesFromFields($fields);
	$template = $object->getApplicationTransactionTemplate();

	$xactions = $this->getConduitTransactions($request, $types, $template);

	$editor = $object->getApplicationTransactionEditor()
	->setActor($viewer)
	->setContentSource($request->newContentSource())
	->setContinueOnNoEffect(true);

	if (!$this->getIsCreate()) {
	$editor->setContinueOnMissingFields(true);
	}

	$xactions = $editor->applyTransactions($object, $xactions);

	$xactions_struct = array();
	foreach ($xactions as $xaction) {
	$xactions_struct[] = array(
	'phid' => $xaction->getPHID(),
	);
	}

	return array(
	'object' => array(
	'id' => $object->getID(),
	'phid' => $object->getPHID(),
	),
	'transactions' => $xactions_struct,
	);
	}


	/**
	* Generate transactions which can be applied from edit actions in a Conduit
	* request.
	*
	* @param ConduitAPIRequest The request.
	* @param list<PhabricatorEditType> Supported edit types.
	* @param PhabricatorApplicationTransaction Template transaction.
	* @return list<PhabricatorApplicationTransaction> Generated transactions.
	* @task conduit
	*/
	private function getConduitTransactions(
	ConduitAPIRequest $request,
	array $types,
	PhabricatorApplicationTransaction $template) {

	$viewer = $request->getUser();
	$transactions_key = 'transactions';

	$xactions = $request->getValue($transactions_key);
	if (!is_array($xactions)) {
	throw new Exception(
	pht(
	'Parameter "%s" is not a list of transactions.',
	$transactions_key));
	}

	foreach ($xactions as $key => $xaction) {
	if (!is_array($xaction)) {
	throw new Exception(
	pht(
	'Parameter "%s" must contain a list of transaction descriptions, '.
	'but item with key "%s" is not a dictionary.',
	$transactions_key,
	$key));
	}

	if (!array_key_exists('type', $xaction)) {
	throw new Exception(
	pht(
	'Parameter "%s" must contain a list of transaction descriptions, '.
	'but item with key "%s" is missing a "type" field. Each '.
	'transaction must have a type field.',
	$transactions_key,
	$key));
	}

	$type = $xaction['type'];
	if (empty($types[$type])) {
	throw new Exception(
	pht(
	'Transaction with key "%s" has invalid type "%s". This type is '.
	'not recognized. Valid types are: %s.',
	$key,
	$type,
	implode(', ', array_keys($types))));
	}
	}

	$results = array();

	if ($this->getIsCreate()) {
	$results[] = id(clone $template)
	->setTransactionType(PhabricatorTransactions::TYPE_CREATE);
	}

	foreach ($xactions as $xaction) {
	$type = $types[$xaction['type']];

	// Let the parameter type interpret the value. This allows you to
	// use usernames in list<user> fields, for example.
	$parameter_type = $type->getConduitParameterType();

	$parameter_type->setViewer($viewer);

	try {
	$xaction['value'] = $parameter_type->getValue($xaction, 'value');
	} catch (Exception $ex) {
	throw new PhutilProxyException(
	pht(
	'Exception when processing transaction of type "%s": %s',
	$xaction['type'],
	$ex->getMessage()),
	$ex);
	}

	$type_xactions = $type->generateTransactions(
	clone $template,
	$xaction);

	foreach ($type_xactions as $type_xaction) {
	$results[] = $type_xaction;
	}
	}

	return $results;
	}


	/**
	* @return map<string, PhabricatorEditType>
	* @task conduit
	*/
	private function getConduitEditTypesFromFields(array $fields) {
	$types = array();
	foreach ($fields as $field) {
	$field_types = $field->getConduitEditTypes();

	if ($field_types === null) {
	continue;
	}

	foreach ($field_types as $field_type) {
	$field_type->setField($field);
	$types[$field_type->getEditType()] = $field_type;
	}
	}
	return $types;
	}

	public function getConduitEditTypes() {
	$config = $this->loadDefaultConfiguration();
	if (!$config) {
	return array();
	}

	$object = $this->newEditableObject();
	$fields = $this->buildEditFields($object);
	return $this->getConduitEditTypesFromFields($fields);
	}

	final public static function getAllEditEngines() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass(__CLASS__)
	->setUniqueMethod('getEngineKey')
	->execute();
	}

	final public static function getByKey(PhabricatorUser $viewer, $key) {
	return id(new PhabricatorEditEngineQuery())
	->setViewer($viewer)
	->withEngineKeys(array($key))
	->executeOne();
	}

	public function getIcon() {
	$application = $this->getApplication();
	return $application->getIcon();
	}

	public function loadQuickCreateItems() {
	$items = array();

	if (!$this->hasCreateCapability()) {
	return $items;
	}

	$configs = $this->loadUsableConfigurationsForCreate();

	if (!$configs) {
	// No items to add.
	} else if (count($configs) == 1) {
	$config = head($configs);
	$items[] = $this->newQuickCreateItem($config);
	} else {
	$group_name = $this->getQuickCreateMenuHeaderText();

	$items[] = id(new PHUIListItemView())
	->setType(PHUIListItemView::TYPE_LABEL)
	->setName($group_name);

	foreach ($configs as $config) {
	$items[] = $this->newQuickCreateItem($config)
	->setIndented(true);
	}
	}

	return $items;
	}

	private function loadUsableConfigurationsForCreate() {
	$viewer = $this->getViewer();

	$configs = id(new PhabricatorEditEngineConfigurationQuery())
	->setViewer($viewer)
	->withEngineKeys(array($this->getEngineKey()))
	->withIsDefault(true)
	->withIsDisabled(false)
	->execute();

	$configs = msort($configs, 'getCreateSortKey');

	return $configs;
	}

	private function newQuickCreateItem(
	PhabricatorEditEngineConfiguration $config) {

	$item_name = $config->getName();
	$item_icon = $config->getIcon();
	$form_key = $config->getIdentifier();
	$item_uri = $this->getEditURI(null, "form/{$form_key}/");

	return id(new PHUIListItemView())
	->setName($item_name)
	->setIcon($item_icon)
	->setHref($item_uri);
	}

	protected function getCreateNewObjectPolicy() {
	return PhabricatorPolicies::POLICY_USER;
	}

	private function requireCreateCapability() {
	PhabricatorPolicyFilter::requireCapability(
	$this->getViewer(),
	$this,
	PhabricatorPolicyCapability::CAN_EDIT);
	}

	private function hasCreateCapability() {
	return PhabricatorPolicyFilter::hasCapability(
	$this->getViewer(),
	$this,
	PhabricatorPolicyCapability::CAN_EDIT);
	}

	/* -( Form Pages )--------------------------------------------------------- */


	public function getSelectedPage() {
	return $this->page;
	}


	private function selectPage($object, $page_key) {
	$pages = $this->getPages($object);

	if (empty($pages[$page_key])) {
	return null;
	}

	$this->page = $pages[$page_key];
	return $this->page;
	}


	protected function newPages($object) {
	return array();
	}


	protected function getPages($object) {
	if ($this->pages === null) {
	$pages = $this->newPages($object);

	assert_instances_of($pages, 'PhabricatorEditPage');
	$pages = mpull($pages, null, 'getKey');

	$this->pages = $pages;
	}

	return $this->pages;
	}

	private function applyPageToFields($object, array $fields) {
	$pages = $this->getPages($object);
	if (!$pages) {
	return $fields;
	}

	if (!$this->getSelectedPage()) {
	return $fields;
	}

	$page_picks = array();
	$default_key = head($pages)->getKey();
	foreach ($pages as $page_key => $page) {
	foreach ($page->getFieldKeys() as $field_key) {
	$page_picks[$field_key] = $page_key;
	}
	if ($page->getIsDefault()) {
	$default_key = $page_key;
	}
	}

	$page_map = array_fill_keys(array_keys($pages), array());
	foreach ($fields as $field_key => $field) {
	if (isset($page_picks[$field_key])) {
	$page_map[$page_picks[$field_key]][$field_key] = $field;
	continue;
	}

	// TODO: Maybe let the field pick a page to associate itself with so
	// extensions can force themselves onto a particular page?

	$page_map[$default_key][$field_key] = $field;
	}

	$page = $this->getSelectedPage();
	if (!$page) {
	$page = head($pages);
	}

	$selected_key = $page->getKey();
	return $page_map[$selected_key];
	}


	/* -( PhabricatorPolicyInterface )----------------------------------------- */


	public function getPHID() {
	return get_class($this);
	}

	public function getCapabilities() {
	return array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	public function getPolicy($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	return PhabricatorPolicies::getMostOpenPolicy();
	case PhabricatorPolicyCapability::CAN_EDIT:
	return $this->getCreateNewObjectPolicy();
	}
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	return false;
	}

	public function describeAutomaticCapability($capability) {
	return null;
	}
	}

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