HeraldAdapter.php
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Created: Mon, Nov 4, 20:43

HeraldAdapter.php
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	<?php

	abstract class HeraldAdapter extends Phobject {

	const CONDITION_CONTAINS = 'contains';
	const CONDITION_NOT_CONTAINS = '!contains';
	const CONDITION_IS = 'is';
	const CONDITION_IS_NOT = '!is';
	const CONDITION_IS_ANY = 'isany';
	const CONDITION_IS_NOT_ANY = '!isany';
	const CONDITION_INCLUDE_ALL = 'all';
	const CONDITION_INCLUDE_ANY = 'any';
	const CONDITION_INCLUDE_NONE = 'none';
	const CONDITION_IS_ME = 'me';
	const CONDITION_IS_NOT_ME = '!me';
	const CONDITION_REGEXP = 'regexp';
	const CONDITION_RULE = 'conditions';
	const CONDITION_NOT_RULE = '!conditions';
	const CONDITION_EXISTS = 'exists';
	const CONDITION_NOT_EXISTS = '!exists';
	const CONDITION_UNCONDITIONALLY = 'unconditionally';
	const CONDITION_NEVER = 'never';
	const CONDITION_REGEXP_PAIR = 'regexp-pair';
	const CONDITION_HAS_BIT = 'bit';
	const CONDITION_NOT_BIT = '!bit';
	const CONDITION_IS_TRUE = 'true';
	const CONDITION_IS_FALSE = 'false';

	const ACTION_AUDIT = 'audit';
	const ACTION_APPLY_BUILD_PLANS = 'applybuildplans';
	const ACTION_BLOCK = 'block';

	private $contentSource;
	private $isNewObject;
	private $applicationEmail;
	private $customActions = null;
	private $queuedTransactions = array();
	private $emailPHIDs = array();
	private $forcedEmailPHIDs = array();
	private $fieldMap;
	private $actionMap;
	private $edgeCache = array();

	public function getEmailPHIDs() {
	return array_values($this->emailPHIDs);
	}

	public function getForcedEmailPHIDs() {
	return array_values($this->forcedEmailPHIDs);
	}

	public function addEmailPHID($phid, $force) {
	$this->emailPHIDs[$phid] = $phid;
	if ($force) {
	$this->forcedEmailPHIDs[$phid] = $phid;
	}
	return $this;
	}

	public function getCustomActions() {
	if ($this->customActions === null) {
	$custom_actions = id(new PhutilSymbolLoader())
	->setAncestorClass('HeraldCustomAction')
	->loadObjects();

	foreach ($custom_actions as $key => $object) {
	if (!$object->appliesToAdapter($this)) {
	unset($custom_actions[$key]);
	}
	}

	$this->customActions = array();
	foreach ($custom_actions as $action) {
	$key = $action->getActionKey();

	if (array_key_exists($key, $this->customActions)) {
	throw new Exception(
	pht(
	"More than one Herald custom action implementation ".
	"handles the action key: '%s'.",
	$key));
	}

	$this->customActions[$key] = $action;
	}
	}

	return $this->customActions;
	}

	public function setContentSource(PhabricatorContentSource $content_source) {
	$this->contentSource = $content_source;
	return $this;
	}
	public function getContentSource() {
	return $this->contentSource;
	}

	public function getIsNewObject() {
	if (is_bool($this->isNewObject)) {
	return $this->isNewObject;
	}

	throw new Exception(
	pht(
	'You must %s to a boolean first!',
	'setIsNewObject()'));
	}
	public function setIsNewObject($new) {
	$this->isNewObject = (bool)$new;
	return $this;
	}

	public function supportsApplicationEmail() {
	return false;
	}

	public function setApplicationEmail(
	PhabricatorMetaMTAApplicationEmail $email) {
	$this->applicationEmail = $email;
	return $this;
	}

	public function getApplicationEmail() {
	return $this->applicationEmail;
	}

	public function getPHID() {
	return $this->getObject()->getPHID();
	}

	abstract public function getHeraldName();

	public function getHeraldField($field_key) {
	return $this->requireFieldImplementation($field_key)
	->getHeraldFieldValue($this->getObject());
	}

	public function applyHeraldEffects(array $effects) {
	assert_instances_of($effects, 'HeraldEffect');

	$result = array();
	foreach ($effects as $effect) {
	$result[] = $this->applyStandardEffect($effect);
	}

	return $result;
	}

	protected function handleCustomHeraldEffect(HeraldEffect $effect) {
	$custom_action = idx($this->getCustomActions(), $effect->getAction());

	if ($custom_action !== null) {
	return $custom_action->applyEffect(
	$this,
	$this->getObject(),
	$effect);
	}

	return null;
	}

	public function isAvailableToUser(PhabricatorUser $viewer) {
	$applications = id(new PhabricatorApplicationQuery())
	->setViewer($viewer)
	->withInstalled(true)
	->withClasses(array($this->getAdapterApplicationClass()))
	->execute();

	return !empty($applications);
	}

	public function queueTransaction($transaction) {
	$this->queuedTransactions[] = $transaction;
	}

	public function getQueuedTransactions() {
	return $this->queuedTransactions;
	}

	public function newTransaction() {
	$object = $this->newObject();

	if (!($object instanceof PhabricatorApplicationTransactionInterface)) {
	throw new Exception(
	pht(
	'Unable to build a new transaction for adapter object; it does '.
	'not implement "%s".',
	'PhabricatorApplicationTransactionInterface'));
	}

	return $object->getApplicationTransactionTemplate();
	}


	/**
	* NOTE: You generally should not override this; it exists to support legacy
	* adapters which had hard-coded content types.
	*/
	public function getAdapterContentType() {
	return get_class($this);
	}

	abstract public function getAdapterContentName();
	abstract public function getAdapterContentDescription();
	abstract public function getAdapterApplicationClass();
	abstract public function getObject();


	/**
	* Return a new characteristic object for this adapter.
	*
	* The adapter will use this object to test for interfaces, generate
	* transactions, and interact with custom fields.
	*
	* Adapters must return an object from this method to enable custom
	* field rules and various implicit actions.
	*
	* Normally, you'll return an empty version of the adapted object:
	*
	* return new ApplicationObject();
	*
	* @return null\|object Template object.
	*/
	protected function newObject() {
	return null;
	}

	public function supportsRuleType($rule_type) {
	return false;
	}

	public function canTriggerOnObject($object) {
	return false;
	}

	public function explainValidTriggerObjects() {
	return pht('This adapter can not trigger on objects.');
	}

	public function getTriggerObjectPHIDs() {
	return array($this->getPHID());
	}

	public function getAdapterSortKey() {
	return sprintf(
	'%08d%s',
	$this->getAdapterSortOrder(),
	$this->getAdapterContentName());
	}

	public function getAdapterSortOrder() {
	return 1000;
	}


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

	private function getFieldImplementationMap() {
	if ($this->fieldMap === null) {
	// We can't use PhutilClassMapQuery here because field expansion
	// depends on the adapter and object.

	$object = $this->getObject();

	$map = array();
	$all = HeraldField::getAllFields();
	foreach ($all as $key => $field) {
	$field = id(clone $field)->setAdapter($this);

	if (!$field->supportsObject($object)) {
	continue;
	}
	$subfields = $field->getFieldsForObject($object);
	foreach ($subfields as $subkey => $subfield) {
	if (isset($map[$subkey])) {
	throw new Exception(
	pht(
	'Two HeraldFields (of classes "%s" and "%s") have the same '.
	'field key ("%s") after expansion for an object of class '.
	'"%s" inside adapter "%s". Each field must have a unique '.
	'field key.',
	get_class($subfield),
	get_class($map[$subkey]),
	$subkey,
	get_class($object),
	get_class($this)));
	}

	$subfield = id(clone $subfield)->setAdapter($this);

	$map[$subkey] = $subfield;
	}
	}
	$this->fieldMap = $map;
	}

	return $this->fieldMap;
	}

	private function getFieldImplementation($key) {
	return idx($this->getFieldImplementationMap(), $key);
	}

	public function getFields() {
	return array_keys($this->getFieldImplementationMap());
	}

	public function getFieldNameMap() {
	return mpull($this->getFieldImplementationMap(), 'getHeraldFieldName');
	}

	public function getFieldGroupKey($field_key) {
	$field = $this->getFieldImplementation($field_key);

	if (!$field) {
	return null;
	}

	return $field->getFieldGroupKey();
	}


	/* -( Conditions )--------------------------------------------------------- */


	public function getConditionNameMap() {
	return array(
	self::CONDITION_CONTAINS => pht('contains'),
	self::CONDITION_NOT_CONTAINS => pht('does not contain'),
	self::CONDITION_IS => pht('is'),
	self::CONDITION_IS_NOT => pht('is not'),
	self::CONDITION_IS_ANY => pht('is any of'),
	self::CONDITION_IS_TRUE => pht('is true'),
	self::CONDITION_IS_FALSE => pht('is false'),
	self::CONDITION_IS_NOT_ANY => pht('is not any of'),
	self::CONDITION_INCLUDE_ALL => pht('include all of'),
	self::CONDITION_INCLUDE_ANY => pht('include any of'),
	self::CONDITION_INCLUDE_NONE => pht('do not include'),
	self::CONDITION_IS_ME => pht('is myself'),
	self::CONDITION_IS_NOT_ME => pht('is not myself'),
	self::CONDITION_REGEXP => pht('matches regexp'),
	self::CONDITION_RULE => pht('matches:'),
	self::CONDITION_NOT_RULE => pht('does not match:'),
	self::CONDITION_EXISTS => pht('exists'),
	self::CONDITION_NOT_EXISTS => pht('does not exist'),
	self::CONDITION_UNCONDITIONALLY => '', // don't show anything!
	self::CONDITION_NEVER => '', // don't show anything!
	self::CONDITION_REGEXP_PAIR => pht('matches regexp pair'),
	self::CONDITION_HAS_BIT => pht('has bit'),
	self::CONDITION_NOT_BIT => pht('lacks bit'),
	);
	}

	public function getConditionsForField($field) {
	return $this->requireFieldImplementation($field)
	->getHeraldFieldConditions();
	}

	private function requireFieldImplementation($field_key) {
	$field = $this->getFieldImplementation($field_key);

	if (!$field) {
	throw new Exception(
	pht(
	'No field with key "%s" is available to Herald adapter "%s".',
	$field_key,
	get_class($this)));
	}

	return $field;
	}

	public function doesConditionMatch(
	HeraldEngine $engine,
	HeraldRule $rule,
	HeraldCondition $condition,
	$field_value) {

	$condition_type = $condition->getFieldCondition();
	$condition_value = $condition->getValue();

	switch ($condition_type) {
	case self::CONDITION_CONTAINS:
	// "Contains" can take an array of strings, as in "Any changed
	// filename" for diffs.
	foreach ((array)$field_value as $value) {
	if (stripos($value, $condition_value) !== false) {
	return true;
	}
	}
	return false;
	case self::CONDITION_NOT_CONTAINS:
	return (stripos($field_value, $condition_value) === false);
	case self::CONDITION_IS:
	return ($field_value == $condition_value);
	case self::CONDITION_IS_NOT:
	return ($field_value != $condition_value);
	case self::CONDITION_IS_ME:
	return ($field_value == $rule->getAuthorPHID());
	case self::CONDITION_IS_NOT_ME:
	return ($field_value != $rule->getAuthorPHID());
	case self::CONDITION_IS_ANY:
	if (!is_array($condition_value)) {
	throw new HeraldInvalidConditionException(
	pht('Expected condition value to be an array.'));
	}
	$condition_value = array_fuse($condition_value);
	return isset($condition_value[$field_value]);
	case self::CONDITION_IS_NOT_ANY:
	if (!is_array($condition_value)) {
	throw new HeraldInvalidConditionException(
	pht('Expected condition value to be an array.'));
	}
	$condition_value = array_fuse($condition_value);
	return !isset($condition_value[$field_value]);
	case self::CONDITION_INCLUDE_ALL:
	if (!is_array($field_value)) {
	throw new HeraldInvalidConditionException(
	pht('Object produced non-array value!'));
	}
	if (!is_array($condition_value)) {
	throw new HeraldInvalidConditionException(
	pht('Expected condition value to be an array.'));
	}

	$have = array_select_keys(array_fuse($field_value), $condition_value);
	return (count($have) == count($condition_value));
	case self::CONDITION_INCLUDE_ANY:
	return (bool)array_select_keys(
	array_fuse($field_value),
	$condition_value);
	case self::CONDITION_INCLUDE_NONE:
	return !array_select_keys(
	array_fuse($field_value),
	$condition_value);
	case self::CONDITION_EXISTS:
	case self::CONDITION_IS_TRUE:
	return (bool)$field_value;
	case self::CONDITION_NOT_EXISTS:
	case self::CONDITION_IS_FALSE:
	return !$field_value;
	case self::CONDITION_UNCONDITIONALLY:
	return (bool)$field_value;
	case self::CONDITION_NEVER:
	return false;
	case self::CONDITION_REGEXP:
	foreach ((array)$field_value as $value) {
	// We add the 'S' flag because we use the regexp multiple times.
	// It shouldn't cause any troubles if the flag is already there
	// - /./S is evaluated same as /./SS.
	$result = @preg_match($condition_value.'S', $value);
	if ($result === false) {
	throw new HeraldInvalidConditionException(
	pht('Regular expression is not valid!'));
	}
	if ($result) {
	return true;
	}
	}
	return false;
	case self::CONDITION_REGEXP_PAIR:
	// Match a JSON-encoded pair of regular expressions against a
	// dictionary. The first regexp must match the dictionary key, and the
	// second regexp must match the dictionary value. If any key/value pair
	// in the dictionary matches both regexps, the condition is satisfied.
	$regexp_pair = null;
	try {
	$regexp_pair = phutil_json_decode($condition_value);
	} catch (PhutilJSONParserException $ex) {
	throw new HeraldInvalidConditionException(
	pht('Regular expression pair is not valid JSON!'));
	}
	if (count($regexp_pair) != 2) {
	throw new HeraldInvalidConditionException(
	pht('Regular expression pair is not a pair!'));
	}

	$key_regexp = array_shift($regexp_pair);
	$value_regexp = array_shift($regexp_pair);

	foreach ((array)$field_value as $key => $value) {
	$key_matches = @preg_match($key_regexp, $key);
	if ($key_matches === false) {
	throw new HeraldInvalidConditionException(
	pht('First regular expression is invalid!'));
	}
	if ($key_matches) {
	$value_matches = @preg_match($value_regexp, $value);
	if ($value_matches === false) {
	throw new HeraldInvalidConditionException(
	pht('Second regular expression is invalid!'));
	}
	if ($value_matches) {
	return true;
	}
	}
	}
	return false;
	case self::CONDITION_RULE:
	case self::CONDITION_NOT_RULE:
	$rule = $engine->getRule($condition_value);
	if (!$rule) {
	throw new HeraldInvalidConditionException(
	pht('Condition references a rule which does not exist!'));
	}

	$is_not = ($condition_type == self::CONDITION_NOT_RULE);
	$result = $engine->doesRuleMatch($rule, $this);
	if ($is_not) {
	$result = !$result;
	}
	return $result;
	case self::CONDITION_HAS_BIT:
	return (($condition_value & $field_value) === (int)$condition_value);
	case self::CONDITION_NOT_BIT:
	return (($condition_value & $field_value) !== (int)$condition_value);
	default:
	throw new HeraldInvalidConditionException(
	pht("Unknown condition '%s'.", $condition_type));
	}
	}

	public function willSaveCondition(HeraldCondition $condition) {
	$condition_type = $condition->getFieldCondition();
	$condition_value = $condition->getValue();

	switch ($condition_type) {
	case self::CONDITION_REGEXP:
	$ok = @preg_match($condition_value, '');
	if ($ok === false) {
	throw new HeraldInvalidConditionException(
	pht(
	'The regular expression "%s" is not valid. Regular expressions '.
	'must have enclosing characters (e.g. "@/path/to/file@", not '.
	'"/path/to/file") and be syntactically correct.',
	$condition_value));
	}
	break;
	case self::CONDITION_REGEXP_PAIR:
	$json = null;
	try {
	$json = phutil_json_decode($condition_value);
	} catch (PhutilJSONParserException $ex) {
	throw new HeraldInvalidConditionException(
	pht(
	'The regular expression pair "%s" is not valid JSON. Enter a '.
	'valid JSON array with two elements.',
	$condition_value));
	}

	if (count($json) != 2) {
	throw new HeraldInvalidConditionException(
	pht(
	'The regular expression pair "%s" must have exactly two '.
	'elements.',
	$condition_value));
	}

	$key_regexp = array_shift($json);
	$val_regexp = array_shift($json);

	$key_ok = @preg_match($key_regexp, '');
	if ($key_ok === false) {
	throw new HeraldInvalidConditionException(
	pht(
	'The first regexp in the regexp pair, "%s", is not a valid '.
	'regexp.',
	$key_regexp));
	}

	$val_ok = @preg_match($val_regexp, '');
	if ($val_ok === false) {
	throw new HeraldInvalidConditionException(
	pht(
	'The second regexp in the regexp pair, "%s", is not a valid '.
	'regexp.',
	$val_regexp));
	}
	break;
	case self::CONDITION_CONTAINS:
	case self::CONDITION_NOT_CONTAINS:
	case self::CONDITION_IS:
	case self::CONDITION_IS_NOT:
	case self::CONDITION_IS_ANY:
	case self::CONDITION_IS_NOT_ANY:
	case self::CONDITION_INCLUDE_ALL:
	case self::CONDITION_INCLUDE_ANY:
	case self::CONDITION_INCLUDE_NONE:
	case self::CONDITION_IS_ME:
	case self::CONDITION_IS_NOT_ME:
	case self::CONDITION_RULE:
	case self::CONDITION_NOT_RULE:
	case self::CONDITION_EXISTS:
	case self::CONDITION_NOT_EXISTS:
	case self::CONDITION_UNCONDITIONALLY:
	case self::CONDITION_NEVER:
	case self::CONDITION_HAS_BIT:
	case self::CONDITION_NOT_BIT:
	case self::CONDITION_IS_TRUE:
	case self::CONDITION_IS_FALSE:
	// No explicit validation for these types, although there probably
	// should be in some cases.
	break;
	default:
	throw new HeraldInvalidConditionException(
	pht(
	'Unknown condition "%s"!',
	$condition_type));
	}
	}


	/* -( Actions )------------------------------------------------------------ */

	private function getActionImplementationMap() {
	if ($this->actionMap === null) {
	// We can't use PhutilClassMapQuery here because action expansion
	// depends on the adapter and object.

	$object = $this->getObject();

	$map = array();
	$all = HeraldAction::getAllActions();
	foreach ($all as $key => $action) {
	$action = id(clone $action)->setAdapter($this);

	if (!$action->supportsObject($object)) {
	continue;
	}

	$subactions = $action->getActionsForObject($object);
	foreach ($subactions as $subkey => $subaction) {
	if (isset($map[$subkey])) {
	throw new Exception(
	pht(
	'Two HeraldActions (of classes "%s" and "%s") have the same '.
	'action key ("%s") after expansion for an object of class '.
	'"%s" inside adapter "%s". Each action must have a unique '.
	'action key.',
	get_class($subaction),
	get_class($map[$subkey]),
	$subkey,
	get_class($object),
	get_class($this)));
	}

	$subaction = id(clone $subaction)->setAdapter($this);

	$map[$subkey] = $subaction;
	}
	}
	$this->actionMap = $map;
	}

	return $this->actionMap;
	}

	private function getActionsForRuleType($rule_type) {
	$actions = $this->getActionImplementationMap();

	foreach ($actions as $key => $action) {
	if (!$action->supportsRuleType($rule_type)) {
	unset($actions[$key]);
	}
	}

	return $actions;
	}

	public function getActionImplementation($key) {
	return idx($this->getActionImplementationMap(), $key);
	}

	public function getActionKeys() {
	return array_keys($this->getActionImplementationMap());
	}

	public function getActionGroupKey($action_key) {
	$action = $this->getActionImplementation($action_key);
	if (!$action) {
	return null;
	}

	return $action->getActionGroupKey();
	}

	public function getCustomActionsForRuleType($rule_type) {
	$results = array();
	foreach ($this->getCustomActions() as $custom_action) {
	if ($custom_action->appliesToRuleType($rule_type)) {
	$results[] = $custom_action;
	}
	}
	return $results;
	}

	public function getActions($rule_type) {
	$custom_actions = $this->getCustomActionsForRuleType($rule_type);
	$custom_actions = mpull($custom_actions, 'getActionKey');

	$actions = $custom_actions;

	foreach ($this->getActionsForRuleType($rule_type) as $key => $action) {
	$actions[] = $key;
	}

	return $actions;
	}

	public function getActionNameMap($rule_type) {
	switch ($rule_type) {
	case HeraldRuleTypeConfig::RULE_TYPE_GLOBAL:
	case HeraldRuleTypeConfig::RULE_TYPE_OBJECT:
	$standard = array(
	self::ACTION_AUDIT => pht('Trigger an Audit by'),
	self::ACTION_APPLY_BUILD_PLANS => pht('Run build plans'),
	self::ACTION_BLOCK => pht('Block change with message'),
	);
	break;
	case HeraldRuleTypeConfig::RULE_TYPE_PERSONAL:
	$standard = array(
	self::ACTION_AUDIT => pht('Trigger an Audit by me'),
	);
	break;
	default:
	throw new Exception(pht("Unknown rule type '%s'!", $rule_type));
	}

	$custom_actions = $this->getCustomActionsForRuleType($rule_type);
	$standard += mpull($custom_actions, 'getActionName', 'getActionKey');

	foreach ($this->getActionsForRuleType($rule_type) as $key => $action) {
	$standard[$key] = $action->getHeraldActionName();
	}

	return $standard;
	}

	public function willSaveAction(
	HeraldRule $rule,
	HeraldActionRecord $action) {

	$impl = $this->getActionImplementation($action->getAction());
	if ($impl) {
	$target = $action->getTarget();
	$target = $impl->willSaveActionValue($target);
	$action->setTarget($target);
	return;
	}

	$target = $action->getTarget();
	if (is_array($target)) {
	$target = array_keys($target);
	}

	$author_phid = $rule->getAuthorPHID();

	$rule_type = $rule->getRuleType();
	if ($rule_type == HeraldRuleTypeConfig::RULE_TYPE_PERSONAL) {
	switch ($action->getAction()) {
	case self::ACTION_AUDIT:
	break;
	case self::ACTION_BLOCK:
	break;
	default:
	throw new HeraldInvalidActionException(
	pht(
	'Unrecognized action type "%s"!',
	$action->getAction()));
	}
	}

	$action->setTarget($target);
	}



	/* -( Values )------------------------------------------------------------- */


	public function getValueTypeForFieldAndCondition($field, $condition) {
	return $this->requireFieldImplementation($field)
	->getHeraldFieldValueType($condition);
	}

	public function getValueTypeForAction($action, $rule_type) {
	$impl = $this->getActionImplementation($action);
	if ($impl) {
	return $impl->getHeraldActionValueType();
	}

	$is_personal = ($rule_type == HeraldRuleTypeConfig::RULE_TYPE_PERSONAL);

	if ($is_personal) {
	switch ($action) {
	case self::ACTION_AUDIT:
	return new HeraldEmptyFieldValue();
	}
	} else {
	switch ($action) {
	case self::ACTION_AUDIT:
	case self::ACTION_APPLY_BUILD_PLANS:
	return $this->buildTokenizerFieldValue(
	new HarbormasterBuildPlanDatasource());
	case self::ACTION_BLOCK:
	return new HeraldTextFieldValue();
	}
	}

	$custom_action = idx($this->getCustomActions(), $action);
	if ($custom_action !== null) {
	return $custom_action->getActionType();
	}

	throw new Exception(pht("Unknown or invalid action '%s'.", $action));
	}

	private function buildTokenizerFieldValue(
	PhabricatorTypeaheadDatasource $datasource) {

	$key = 'action.'.get_class($datasource);

	return id(new HeraldTokenizerFieldValue())
	->setKey($key)
	->setDatasource($datasource);
	}

	/* -( Repetition )--------------------------------------------------------- */


	public function getRepetitionOptions() {
	return array(
	HeraldRepetitionPolicyConfig::EVERY,
	);
	}

	abstract protected function initializeNewAdapter();

	/**
	* Does this adapter's event fire only once?
	*
	* Single use adapters (like pre-commit and diff adapters) only fire once,
	* so fields like "Is new object" don't make sense to apply to their content.
	*
	* @return bool
	*/
	public function isSingleEventAdapter() {
	return false;
	}

	public static function getAllAdapters() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass(__CLASS__)
	->setUniqueMethod('getAdapterContentType')
	->setSortMethod('getAdapterSortKey')
	->execute();
	}

	public static function getAdapterForContentType($content_type) {
	$adapters = self::getAllAdapters();

	foreach ($adapters as $adapter) {
	if ($adapter->getAdapterContentType() == $content_type) {
	$adapter = id(clone $adapter);
	$adapter->initializeNewAdapter();
	return $adapter;
	}
	}

	throw new Exception(
	pht(
	'No adapter exists for Herald content type "%s".',
	$content_type));
	}

	public static function getEnabledAdapterMap(PhabricatorUser $viewer) {
	$map = array();

	$adapters = self::getAllAdapters();
	foreach ($adapters as $adapter) {
	if (!$adapter->isAvailableToUser($viewer)) {
	continue;
	}
	$type = $adapter->getAdapterContentType();
	$name = $adapter->getAdapterContentName();
	$map[$type] = $name;
	}

	return $map;
	}

	public function getEditorValueForCondition(
	PhabricatorUser $viewer,
	HeraldCondition $condition,
	array $handles) {

	$field = $this->requireFieldImplementation($condition->getFieldName());

	return $field->getEditorValue(
	$viewer,
	$condition->getFieldCondition(),
	$condition->getValue());
	}

	public function renderRuleAsText(
	HeraldRule $rule,
	PhabricatorHandleList $handles,
	PhabricatorUser $viewer) {

	require_celerity_resource('herald-css');

	$icon = id(new PHUIIconView())
	->setIconFont('fa-chevron-circle-right lightgreytext')
	->addClass('herald-list-icon');

	if ($rule->getMustMatchAll()) {
	$match_text = pht('When all of these conditions are met:');
	} else {
	$match_text = pht('When any of these conditions are met:');
	}

	$match_title = phutil_tag(
	'p',
	array(
	'class' => 'herald-list-description',
	),
	$match_text);

	$match_list = array();
	foreach ($rule->getConditions() as $condition) {
	$match_list[] = phutil_tag(
	'div',
	array(
	'class' => 'herald-list-item',
	),
	array(
	$icon,
	$this->renderConditionAsText($condition, $handles, $viewer),
	));
	}

	$integer_code_for_every = HeraldRepetitionPolicyConfig::toInt(
	HeraldRepetitionPolicyConfig::EVERY);

	if ($rule->getRepetitionPolicy() == $integer_code_for_every) {
	$action_text =
	pht('Take these actions every time this rule matches:');
	} else {
	$action_text =
	pht('Take these actions the first time this rule matches:');
	}

	$action_title = phutil_tag(
	'p',
	array(
	'class' => 'herald-list-description',
	),
	$action_text);

	$action_list = array();
	foreach ($rule->getActions() as $action) {
	$action_list[] = phutil_tag(
	'div',
	array(
	'class' => 'herald-list-item',
	),
	array(
	$icon,
	$this->renderActionAsText($viewer, $action, $handles),
	));
	}

	return array(
	$match_title,
	$match_list,
	$action_title,
	$action_list,
	);
	}

	private function renderConditionAsText(
	HeraldCondition $condition,
	PhabricatorHandleList $handles,
	PhabricatorUser $viewer) {

	$field_type = $condition->getFieldName();
	$field = $this->getFieldImplementation($field_type);

	if (!$field) {
	return pht('Unknown Field: "%s"', $field_type);
	}

	$field_name = $field->getHeraldFieldName();

	$condition_type = $condition->getFieldCondition();
	$condition_name = idx($this->getConditionNameMap(), $condition_type);

	$value = $this->renderConditionValueAsText($condition, $handles, $viewer);

	return array(
	$field_name,
	$condition_name,
	$value,
	);
	}

	private function renderActionAsText(
	PhabricatorUser $viewer,
	HeraldActionRecord $action,
	PhabricatorHandleList $handles) {

	$impl = $this->getActionImplementation($action->getAction());
	if ($impl) {
	$impl->setViewer($viewer);

	$value = $action->getTarget();
	return $impl->renderActionDescription($value);
	}

	$rule_global = HeraldRuleTypeConfig::RULE_TYPE_GLOBAL;

	$action_type = $action->getAction();

	$default = pht('(Unknown Action "%s") equals', $action_type);

	$action_name = idx(
	$this->getActionNameMap($rule_global),
	$action_type,
	$default);

	$target = $this->renderActionTargetAsText($action, $handles);

	return hsprintf(' %s %s', $action_name, $target);
	}

	private function renderConditionValueAsText(
	HeraldCondition $condition,
	PhabricatorHandleList $handles,
	PhabricatorUser $viewer) {

	$field = $this->requireFieldImplementation($condition->getFieldName());

	return $field->renderConditionValue(
	$viewer,
	$condition->getFieldCondition(),
	$condition->getValue());
	}

	private function renderActionTargetAsText(
	HeraldActionRecord $action,
	PhabricatorHandleList $handles) {

	// TODO: This should be driven through HeraldAction.

	$target = $action->getTarget();
	if (!is_array($target)) {
	$target = array($target);
	}
	foreach ($target as $index => $val) {
	switch ($action->getAction()) {
	default:
	$handle = $handles->getHandleIfExists($val);
	if ($handle) {
	$target[$index] = $handle->renderLink();
	}
	break;
	}
	}
	$target = phutil_implode_html(', ', $target);
	return $target;
	}

	/**
	* Given a @{class:HeraldRule}, this function extracts all the phids that
	* we'll want to load as handles later.
	*
	* This function performs a somewhat hacky approach to figuring out what
	* is and is not a phid - try to get the phid type and if the type is
	* not unknown assume its a valid phid.
	*
	* Don't try this at home. Use more strongly typed data at home.
	*
	* Think of the children.
	*/
	public static function getHandlePHIDs(HeraldRule $rule) {
	$phids = array($rule->getAuthorPHID());
	foreach ($rule->getConditions() as $condition) {
	$value = $condition->getValue();
	if (!is_array($value)) {
	$value = array($value);
	}
	foreach ($value as $val) {
	if (phid_get_type($val) !=
	PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN) {
	$phids[] = $val;
	}
	}
	}

	foreach ($rule->getActions() as $action) {
	$target = $action->getTarget();
	if (!is_array($target)) {
	$target = array($target);
	}
	foreach ($target as $val) {
	if (phid_get_type($val) !=
	PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN) {
	$phids[] = $val;
	}
	}
	}

	if ($rule->isObjectRule()) {
	$phids[] = $rule->getTriggerObjectPHID();
	}

	return $phids;
	}

	/* -( Applying Effects )--------------------------------------------------- */


	/**
	* @task apply
	*/
	protected function applyStandardEffect(HeraldEffect $effect) {
	$action = $effect->getAction();
	$rule_type = $effect->getRule()->getRuleType();

	$impl = $this->getActionImplementation($action);
	if ($impl) {
	if ($impl->supportsRuleType($rule_type)) {
	$impl->applyEffect($this->getObject(), $effect);
	return $impl->getApplyTranscript($effect);
	}
	}

	$supported = $this->getActions($rule_type);
	$supported = array_fuse($supported);
	if (empty($supported[$action])) {
	return new HeraldApplyTranscript(
	$effect,
	false,
	pht(
	'Adapter "%s" does not support action "%s" for rule type "%s".',
	get_class($this),
	$action,
	$rule_type));
	}

	$result = $this->handleCustomHeraldEffect($effect);

	if (!$result) {
	return new HeraldApplyTranscript(
	$effect,
	false,
	pht(
	'No custom action exists to handle rule action "%s".',
	$action));
	}

	return $result;
	}

	public function loadEdgePHIDs($type) {
	if (!isset($this->edgeCache[$type])) {
	$phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
	$this->getObject()->getPHID(),
	$type);

	$this->edgeCache[$type] = array_fuse($phids);
	}
	return $this->edgeCache[$type];
	}

	}

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