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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';

			const SUBTYPE_DEFAULT = 'default';

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

			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() {
			$key = $this->getPhobjectClassConstant('ENGINECONST', 64);
			if (strpos($key, '/') !== false) {
			throw new Exception(
			pht(
			'EditEngine ("%s") contains an invalid key character "/".',
			get_class($this)));
			}
			return $key;
			}

			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;
			}

			public function isDefaultQuickCreateEngine() {
			return false;
			}

			public function getDefaultQuickCreateFormKeys() {
			$keys = array();

			if ($this->isDefaultQuickCreateEngine()) {
			$keys[] = self::EDITENGINECONFIG_DEFAULT;
			}

			foreach ($keys as $idx => $key) {
			$keys[$idx] = $this->getEngineKey().'/'.$key;
			}

			return $keys;
			}

			public static function splitFullKey($full_key) {
			return explode('/', $full_key, 2);
			}

			public function getQuickCreateOrderVector() {
			return id(new PhutilSortVector())
			->addString($this->getObjectCreateShortText());
			}

			/**
			* 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;
			}

			public function setNavigation(AphrontSideNavFilterView $navigation) {
			$this->navigation = $navigation;
			return $this;
			}

			public function getNavigation() {
			return $this->navigation;
			}

			public function setHideHeader($hide_header) {
			$this->hideHeader = $hide_header;
			return $this;
			}

			public function getHideHeader() {
			return $this->hideHeader;
			}


			/* -( 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;
			}

			final public function supportsSubtypes() {
			try {
			$object = $this->newEditableObject();
			} catch (Exception $ex) {
			return false;
			}

			return ($object instanceof PhabricatorEditEngineSubtypeInterface);
			}

			final public function newSubtypeMap() {
			return $this->newEditableObject()->newEditEngineSubtypeMap();
			}


			/* -( 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);
			}


			/**
			* 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($object) {
			$query = $this->newConfigurationQuery()
			->withIsEdit(true)
			->withIsDisabled(false);

			// If this object supports subtyping, we edit it with a form of the same
			// subtype: so "bug" tasks get edited with "bug" forms.
			if ($object instanceof PhabricatorEditEngineSubtypeInterface) {
			$query->withSubtypes(
			array(
			$object->getEditEngineSubtype(),
			));
			}

			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 getEffectiveObjectEditDoneURI($object) {
			return $this->getEffectiveObjectViewURI($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 = $this->getEditAction();

			$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 = $this->loadDefaultEditConfiguration($object);
			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();

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

			$config = $this->getEditEngineConfiguration()
			->attachEngine($this);

			$can_interact = PhabricatorPolicyFilter::canInteract($viewer, $object);
			if (!$can_interact &&
			!$request->getBool('editEngine') &&
			!$request->getBool('overrideLock')) {

			$lock = PhabricatorEditEngineLock::newForObject($viewer, $object);

			$dialog = $this->getController()
			->newDialog()
			->addHiddenInput('overrideLock', true)
			->setDisableWorkflowOnSubmit(true)
			->addCancelButton($cancel_uri);

			return $lock->willPromptUserForLockOverrideWithDialog($dialog);
			}

			$validation_exception = null;
			if ($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);

			if ($this->supportsSubtypes()) {
			$xactions[] = id(clone $template)
			->setTransactionType(PhabricatorTransactions::TYPE_SUBTYPE)
			->setNewValue($config->getSubtype());
			}
			}

			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 {
			$xactions = $this->willApplyTransactions($object, $xactions);

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

			$this->didApplyTransactions($object, $xactions);

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

			foreach ($fields as $field) {
			$message = $this->getValidationExceptionShortMessage($ex, $field);
			if ($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()) {
			return $this->getController()
			->newDialog()
			->setWidth(AphrontDialogView::WIDTH_FULL)
			->setTitle($header_text)
			->setValidationException($validation_exception)
			->appendForm($form)
			->addCancelButton($cancel_uri)
			->addSubmitButton($submit_button);
			}

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

			if ($this->getHideHeader()) {
			$header = null;
			$crumbs->setBorder(false);
			} else {
			$header = id(new PHUIHeaderView())
			->setHeader($header_text)
			->setHeaderIcon($header_icon);
			$crumbs->setBorder(true);
			}

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

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

			// This is fairly questionable, but in use by Settings.
			if ($request->getURIData('formSaved')) {
			$box->setFormSaved(true);
			}

			$content = array(
			$box,
			$previews,
			);

			$view = new PHUITwoColumnView();

			if ($header) {
			$view->setHeader($header);
			}

			$navigation = $this->getNavigation();
			if ($navigation) {
			$view
			->setNavigation($navigation)
			->setMainColumn($content);
			} else {
			$view->setFooter($content);
			}

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

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

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

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

			$form = id(new AphrontFormView())
			->setUser($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()) {
			$buttons = id(new AphrontFormSubmitControl())
			->setValue($submit_button);

			if ($cancel_uri) {
			$buttons->addCancelButton($cancel_uri);
			}

			$form->appendControl($buttons);
			}

			return $form;
			}

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

			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();

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

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

			$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;
			}


			public function newNUXButton($text) {
			$specs = $this->newCreateActionSpecifications(array());
			$head = head($specs);

			return id(new PHUIButtonView())
			->setTag('a')
			->setText($text)
			->setHref($head['uri'])
			->setDisabled($head['disabled'])
			->setWorkflow($head['workflow'])
			->setColor(PHUIButtonView::GREEN);
			}


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

			$specs = $this->newCreateActionSpecifications($parameters);

			$head = head($specs);
			$menu_uri = $head['uri'];

			$dropdown = null;
			if (count($specs) > 1) {
			$menu_icon = 'fa-caret-square-o-down';
			$menu_name = $this->getObjectCreateShortText();
			$workflow = false;
			$disabled = false;

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

			foreach ($specs as $spec) {
			$dropdown->addAction(
			id(new PhabricatorActionView())
			->setName($spec['name'])
			->setIcon($spec['icon'])
			->setHref($spec['uri'])
			->setDisabled($head['disabled'])
			->setWorkflow($head['workflow']));
			}

			} else {
			$menu_icon = $head['icon'];
			$menu_name = $head['name'];

			$workflow = $head['workflow'];
			$disabled = $head['disabled'];
			}

			$action = id(new PHUIListItemView())
			->setName($menu_name)
			->setHref($menu_uri)
			->setIcon($menu_icon)
			->setWorkflow($workflow)
			->setDisabled($disabled);

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

			$crumbs->addAction($action);
			}


			/**
			* Build a raw description of available "Create New Object" UI options so
			* other methods can build menus or buttons.
			*/
			public function newCreateActionSpecifications(array $parameters) {
			$viewer = $this->getViewer();

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

			$disabled = false;
			$workflow = false;

			$menu_icon = 'fa-plus-square';
			$specs = array();
			if (!$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/');
			}

			$specs[] = array(
			'name' => $this->getObjectCreateShortText(),
			'uri' => $create_uri,
			'icon' => $menu_icon,
			'disabled' => $disabled,
			'workflow' => $workflow,
			);
			} else {
			foreach ($configs as $config) {
			$config_uri = $config->getCreateURI();

			if ($parameters) {
			$config_uri = (string)id(new PhutilURI($config_uri))
			->setQueryParams($parameters);
			}

			$specs[] = array(
			'name' => $config->getDisplayName(),
			'uri' => $config_uri,
			'icon' => 'fa-plus',
			'disabled' => false,
			'workflow' => false,
			);
			}
			}

			return $specs;
			}

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

			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();

			$can_interact = PhabricatorPolicyFilter::canInteract($viewer, $object);
			if (!$can_interact) {
			$lock = PhabricatorEditEngineLock::newForObject($viewer, $object);

			return id(new PhabricatorApplicationTransactionCommentView())
			->setEditEngineLock($lock);
			}

			$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);

			$can_edit = PhabricatorPolicyFilter::hasCapability(
			$viewer,
			$object,
			PhabricatorPolicyCapability::CAN_EDIT);

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

			if (!$can_edit) {
			if (!$field->getCanApplyWithoutEditCapability()) {
			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);

			$comment_groups = $this->newCommentActionGroups();
			$view->setCommentActionGroups($comment_groups);

			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);

			$dialog = $this->getController()
			->newDialog()
			->addCancelButton($cancel_uri);

			if ($title !== null) {
			$dialog->setTitle($title);
			}

			if ($body !== null) {
			$dialog->appendParagraph($body);
			}

			return $dialog;
			}


			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 buildLockedObjectResponse($object) {
			$dialog = $this->buildError($object, null, null);
			$viewer = $this->getViewer();

			$lock = PhabricatorEditEngineLock::newForObject($viewer, $object);
			return $lock->willBlockUserInteractionWithDialog($dialog);
			}

			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();
			}

			$can_interact = PhabricatorPolicyFilter::canInteract($viewer, $object);
			if (!$can_interact) {
			return $this->buildLockedObjectResponse($object);
			}

			$config = $this->loadDefaultEditConfiguration($object);
			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);

			$is_empty = (!strlen($comment_text) && !$actions);

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

			$draft_engine = $this->newDraftEngine($object);
			if ($draft_engine) {
			$draft_engine
			->setVersionedDraft($draft)
			->synchronize();
			}
			}
			}

			$xactions = array();

			$can_edit = PhabricatorPolicyFilter::hasCapability(
			$viewer,
			$object,
			PhabricatorPolicyCapability::CAN_EDIT);

			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 you don't have edit permission on the object, you're limited in
			// which actions you can take via the comment form. Most actions
			// need edit permission, but some actions (like "Accept Revision")
			// can be applied by anyone with view permission.
			if (!$can_edit) {
			if (!$field->getCanApplyWithoutEditCapability()) {
			// We know the user doesn't have the capability, so this will
			// raise a policy exception.
			PhabricatorPolicyFilter::requireCapability(
			$viewer,
			$object,
			PhabricatorPolicyCapability::CAN_EDIT);
			}
			}

			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;
			}
			}
			}

			$auto_xactions = $this->newAutomaticCommentTransactions($object);
			foreach ($auto_xactions as $xaction) {
			$xactions[] = $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 (PhabricatorApplicationTransactionValidationException $ex) {
			return id(new PhabricatorApplicationTransactionValidationResponse())
			->setCancelURI($view_uri)
			->setException($ex);
			} catch (PhabricatorApplicationTransactionNoEffectException $ex) {
			return id(new PhabricatorApplicationTransactionNoEffectResponse())
			->setCancelURI($view_uri)
			->setException($ex);
			}

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

			$draft_engine = $this->newDraftEngine($object);
			if ($draft_engine) {
			$draft_engine
			->setVersionedDraft(null)
			->synchronize();
			}
			}

			if ($request->isAjax() && $is_preview) {
			$preview_content = $this->newCommentPreviewContent($object, $xactions);

			return id(new PhabricatorApplicationTransactionResponse())
			->setViewer($viewer)
			->setTransactions($xactions)
			->setIsPreview($is_preview)
			->setPreviewContent($preview_content);
			} else {
			return id(new AphrontRedirectResponse())
			->setURI($view_uri);
			}
			}

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

			if ($object instanceof PhabricatorDraftInterface) {
			$engine = $object->newDraftEngine();
			} else {
			$engine = new PhabricatorBuiltinDraftEngine();
			}

			return $engine
			->setObject($object)
			->setViewer($viewer);
			}


			/* -( 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',
			$request->getIsStrictlyTyped());
			} 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();
			}

			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');

			// Attach this specific engine to configurations we load so they can access
			// any runtime configuration. For example, this allows us to generate the
			// correct "Create Form" buttons when editing forms, see T12301.
			foreach ($configs as $config) {
			$config->attachEngine($this);
			}

			return $configs;
			}

			protected function getValidationExceptionShortMessage(
			PhabricatorApplicationTransactionValidationException $ex,
			PhabricatorEditField $field) {

			$xaction_type = $field->getTransactionType();
			if ($xaction_type === null) {
			return null;
			}

			return $ex->getShortMessage($xaction_type);
			}

			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);
			}

			public function isCommentAction() {
			return ($this->getEditAction() == 'comment');
			}

			public function getEditAction() {
			$controller = $this->getController();
			$request = $controller->getRequest();
			return $request->getURIData('editAction');
			}

			protected function newCommentActionGroups() {
			return array();
			}

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

			protected function newCommentPreviewContent($object, array $xactions) {
			return null;
			}


			/* -( 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];
			}

			protected function willApplyTransactions($object, array $xactions) {
			return $xactions;
			}

			protected function didApplyTransactions($object, array $xactions) {
			return;
			}


			/* -( 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;
			}

			}

phab/src/applications/transactions/editengine/PhabricatorEditEngine.php47d8cee39e23feature/testing

PhabricatorEditEngine.phpView Options

phab/src/applications/transactions/editengine/PhabricatorEditEngine.php
47d8cee39e23feature/testing

PhabricatorEditEngine.php
View Options