HeraldAdapter.php
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Created: Thu, May 9, 11:28

HeraldAdapter.php
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	<?php

	/**
	* @task customfield Custom Field Integration
	*/
	abstract class HeraldAdapter {

	const FIELD_TITLE = 'title';
	const FIELD_BODY = 'body';
	const FIELD_AUTHOR = 'author';
	const FIELD_ASSIGNEE = 'assignee';
	const FIELD_REVIEWER = 'reviewer';
	const FIELD_REVIEWERS = 'reviewers';
	const FIELD_COMMITTER = 'committer';
	const FIELD_CC = 'cc';
	const FIELD_TAGS = 'tags';
	const FIELD_DIFF_FILE = 'diff-file';
	const FIELD_DIFF_CONTENT = 'diff-content';
	const FIELD_DIFF_ADDED_CONTENT = 'diff-added-content';
	const FIELD_DIFF_REMOVED_CONTENT = 'diff-removed-content';
	const FIELD_DIFF_ENORMOUS = 'diff-enormous';
	const FIELD_REPOSITORY = 'repository';
	const FIELD_REPOSITORY_PROJECTS = 'repository-projects';
	const FIELD_RULE = 'rule';
	const FIELD_AFFECTED_PACKAGE = 'affected-package';
	const FIELD_AFFECTED_PACKAGE_OWNER = 'affected-package-owner';
	const FIELD_CONTENT_SOURCE = 'contentsource';
	const FIELD_ALWAYS = 'always';
	const FIELD_AUTHOR_PROJECTS = 'authorprojects';
	const FIELD_PROJECTS = 'projects';
	const FIELD_PUSHER = 'pusher';
	const FIELD_PUSHER_PROJECTS = 'pusher-projects';
	const FIELD_DIFFERENTIAL_REVISION = 'differential-revision';
	const FIELD_DIFFERENTIAL_REVIEWERS = 'differential-reviewers';
	const FIELD_DIFFERENTIAL_CCS = 'differential-ccs';
	const FIELD_DIFFERENTIAL_ACCEPTED = 'differential-accepted';
	const FIELD_IS_MERGE_COMMIT = 'is-merge-commit';
	const FIELD_BRANCHES = 'branches';
	const FIELD_AUTHOR_RAW = 'author-raw';
	const FIELD_COMMITTER_RAW = 'committer-raw';
	const FIELD_IS_NEW_OBJECT = 'new-object';
	const FIELD_TASK_PRIORITY = 'taskpriority';
	const FIELD_ARCANIST_PROJECT = 'arcanist-project';
	const FIELD_PUSHER_IS_COMMITTER = 'pusher-is-committer';

	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_ADD_CC = 'addcc';
	const ACTION_REMOVE_CC = 'remcc';
	const ACTION_EMAIL = 'email';
	const ACTION_NOTHING = 'nothing';
	const ACTION_AUDIT = 'audit';
	const ACTION_FLAG = 'flag';
	const ACTION_ASSIGN_TASK = 'assigntask';
	const ACTION_ADD_PROJECTS = 'addprojects';
	const ACTION_ADD_REVIEWERS = 'addreviewers';
	const ACTION_ADD_BLOCKING_REVIEWERS = 'addblockingreviewers';
	const ACTION_APPLY_BUILD_PLANS = 'applybuildplans';
	const ACTION_BLOCK = 'block';

	const VALUE_TEXT = 'text';
	const VALUE_NONE = 'none';
	const VALUE_EMAIL = 'email';
	const VALUE_USER = 'user';
	const VALUE_TAG = 'tag';
	const VALUE_RULE = 'rule';
	const VALUE_REPOSITORY = 'repository';
	const VALUE_OWNERS_PACKAGE = 'package';
	const VALUE_PROJECT = 'project';
	const VALUE_FLAG_COLOR = 'flagcolor';
	const VALUE_CONTENT_SOURCE = 'contentsource';
	const VALUE_USER_OR_PROJECT = 'userorproject';
	const VALUE_BUILD_PLAN = 'buildplan';
	const VALUE_TASK_PRIORITY = 'taskpriority';
	const VALUE_ARCANIST_PROJECT = 'arcanistprojects';

	private $contentSource;
	private $isNewObject;
	private $customFields = false;

	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 setIsNewObject to a boolean first!'));
	}
	public function setIsNewObject($new) {
	$this->isNewObject = (bool) $new;
	return $this;
	}

	abstract public function getPHID();
	abstract public function getHeraldName();

	public function getHeraldField($field_name) {
	switch ($field_name) {
	case self::FIELD_RULE:
	return null;
	case self::FIELD_CONTENT_SOURCE:
	return $this->getContentSource()->getSource();
	case self::FIELD_ALWAYS:
	return true;
	case self::FIELD_IS_NEW_OBJECT:
	return $this->getIsNewObject();
	default:
	if ($this->isHeraldCustomKey($field_name)) {
	return $this->getCustomFieldValue($field_name);
	}

	throw new Exception(
	"Unknown field '{$field_name}'!");
	}
	}

	abstract public function applyHeraldEffects(array $effects);

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

	return !empty($applications);
	}


	/**
	* 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();

	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 )------------------------------------------------------------- */


	public function getFields() {
	$fields = array();

	$fields[] = self::FIELD_ALWAYS;
	$fields[] = self::FIELD_RULE;

	$custom_fields = $this->getCustomFields();
	if ($custom_fields) {
	foreach ($custom_fields->getFields() as $custom_field) {
	$key = $custom_field->getFieldKey();
	$fields[] = $this->getHeraldKeyFromCustomKey($key);
	}
	}

	return $fields;
	}

	public function getFieldNameMap() {
	return array(
	self::FIELD_TITLE => pht('Title'),
	self::FIELD_BODY => pht('Body'),
	self::FIELD_AUTHOR => pht('Author'),
	self::FIELD_ASSIGNEE => pht('Assignee'),
	self::FIELD_COMMITTER => pht('Committer'),
	self::FIELD_REVIEWER => pht('Reviewer'),
	self::FIELD_REVIEWERS => pht('Reviewers'),
	self::FIELD_CC => pht('CCs'),
	self::FIELD_TAGS => pht('Tags'),
	self::FIELD_DIFF_FILE => pht('Any changed filename'),
	self::FIELD_DIFF_CONTENT => pht('Any changed file content'),
	self::FIELD_DIFF_ADDED_CONTENT => pht('Any added file content'),
	self::FIELD_DIFF_REMOVED_CONTENT => pht('Any removed file content'),
	self::FIELD_DIFF_ENORMOUS => pht('Change is enormous'),
	self::FIELD_REPOSITORY => pht('Repository'),
	self::FIELD_REPOSITORY_PROJECTS => pht('Repository\'s projects'),
	self::FIELD_RULE => pht('Another Herald rule'),
	self::FIELD_AFFECTED_PACKAGE => pht('Any affected package'),
	self::FIELD_AFFECTED_PACKAGE_OWNER =>
	pht("Any affected package's owner"),
	self::FIELD_CONTENT_SOURCE => pht('Content Source'),
	self::FIELD_ALWAYS => pht('Always'),
	self::FIELD_AUTHOR_PROJECTS => pht("Author's projects"),
	self::FIELD_PROJECTS => pht('Projects'),
	self::FIELD_PUSHER => pht('Pusher'),
	self::FIELD_PUSHER_PROJECTS => pht("Pusher's projects"),
	self::FIELD_DIFFERENTIAL_REVISION => pht('Differential revision'),
	self::FIELD_DIFFERENTIAL_REVIEWERS => pht('Differential reviewers'),
	self::FIELD_DIFFERENTIAL_CCS => pht('Differential CCs'),
	self::FIELD_DIFFERENTIAL_ACCEPTED
	=> pht('Accepted Differential revision'),
	self::FIELD_IS_MERGE_COMMIT => pht('Commit is a merge'),
	self::FIELD_BRANCHES => pht('Commit\'s branches'),
	self::FIELD_AUTHOR_RAW => pht('Raw author name'),
	self::FIELD_COMMITTER_RAW => pht('Raw committer name'),
	self::FIELD_IS_NEW_OBJECT => pht('Is newly created?'),
	self::FIELD_TASK_PRIORITY => pht('Task priority'),
	self::FIELD_ARCANIST_PROJECT => pht('Arcanist Project'),
	self::FIELD_PUSHER_IS_COMMITTER => pht('Pusher same as committer'),
	) + $this->getCustomFieldNameMap();
	}


	/* -( 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($field) {
	switch ($field) {
	case self::FIELD_TITLE:
	case self::FIELD_BODY:
	case self::FIELD_COMMITTER_RAW:
	case self::FIELD_AUTHOR_RAW:
	return array(
	self::CONDITION_CONTAINS,
	self::CONDITION_NOT_CONTAINS,
	self::CONDITION_IS,
	self::CONDITION_IS_NOT,
	self::CONDITION_REGEXP,
	);
	case self::FIELD_REVIEWER:
	case self::FIELD_PUSHER:
	case self::FIELD_TASK_PRIORITY:
	case self::FIELD_ARCANIST_PROJECT:
	return array(
	self::CONDITION_IS_ANY,
	self::CONDITION_IS_NOT_ANY,
	);
	case self::FIELD_REPOSITORY:
	case self::FIELD_ASSIGNEE:
	case self::FIELD_AUTHOR:
	case self::FIELD_COMMITTER:
	return array(
	self::CONDITION_IS_ANY,
	self::CONDITION_IS_NOT_ANY,
	self::CONDITION_EXISTS,
	self::CONDITION_NOT_EXISTS,
	);
	case self::FIELD_TAGS:
	case self::FIELD_REVIEWERS:
	case self::FIELD_CC:
	case self::FIELD_AUTHOR_PROJECTS:
	case self::FIELD_PROJECTS:
	case self::FIELD_AFFECTED_PACKAGE:
	case self::FIELD_AFFECTED_PACKAGE_OWNER:
	case self::FIELD_PUSHER_PROJECTS:
	case self::FIELD_REPOSITORY_PROJECTS:
	return array(
	self::CONDITION_INCLUDE_ALL,
	self::CONDITION_INCLUDE_ANY,
	self::CONDITION_INCLUDE_NONE,
	self::CONDITION_EXISTS,
	self::CONDITION_NOT_EXISTS,
	);
	case self::FIELD_DIFF_FILE:
	case self::FIELD_BRANCHES:
	return array(
	self::CONDITION_CONTAINS,
	self::CONDITION_REGEXP,
	);
	case self::FIELD_DIFF_CONTENT:
	case self::FIELD_DIFF_ADDED_CONTENT:
	case self::FIELD_DIFF_REMOVED_CONTENT:
	return array(
	self::CONDITION_CONTAINS,
	self::CONDITION_REGEXP,
	self::CONDITION_REGEXP_PAIR,
	);
	case self::FIELD_RULE:
	return array(
	self::CONDITION_RULE,
	self::CONDITION_NOT_RULE,
	);
	case self::FIELD_CONTENT_SOURCE:
	return array(
	self::CONDITION_IS,
	self::CONDITION_IS_NOT,
	);
	case self::FIELD_ALWAYS:
	return array(
	self::CONDITION_UNCONDITIONALLY,
	);
	case self::FIELD_DIFFERENTIAL_REVIEWERS:
	return array(
	self::CONDITION_EXISTS,
	self::CONDITION_NOT_EXISTS,
	self::CONDITION_INCLUDE_ALL,
	self::CONDITION_INCLUDE_ANY,
	self::CONDITION_INCLUDE_NONE,
	);
	case self::FIELD_DIFFERENTIAL_CCS:
	return array(
	self::CONDITION_INCLUDE_ALL,
	self::CONDITION_INCLUDE_ANY,
	self::CONDITION_INCLUDE_NONE,
	);
	case self::FIELD_DIFFERENTIAL_REVISION:
	case self::FIELD_DIFFERENTIAL_ACCEPTED:
	return array(
	self::CONDITION_EXISTS,
	self::CONDITION_NOT_EXISTS,
	);
	case self::FIELD_IS_MERGE_COMMIT:
	case self::FIELD_DIFF_ENORMOUS:
	case self::FIELD_IS_NEW_OBJECT:
	case self::FIELD_PUSHER_IS_COMMITTER:
	return array(
	self::CONDITION_IS_TRUE,
	self::CONDITION_IS_FALSE,
	);
	default:
	if ($this->isHeraldCustomKey($field)) {
	return $this->getCustomFieldConditions($field);
	}
	throw new Exception(
	"This adapter does not define conditions for field '{$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(
	'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(
	'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($field_value)) {
	throw new HeraldInvalidConditionException(
	'Object produced non-array value!');
	}
	if (!is_array($condition_value)) {
	throw new HeraldInvalidConditionException(
	'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(
	'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.
	$regexp_pair = json_decode($condition_value, true);
	if (!is_array($regexp_pair)) {
	throw new HeraldInvalidConditionException(
	'Regular expression pair is not valid JSON!');
	}
	if (count($regexp_pair) != 2) {
	throw new HeraldInvalidConditionException(
	'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(
	'First regular expression is invalid!');
	}
	if ($key_matches) {
	$value_matches = @preg_match($value_regexp, $value);
	if ($value_matches === false) {
	throw new HeraldInvalidConditionException(
	'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(
	'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) $condition_value);
	default:
	throw new HeraldInvalidConditionException(
	"Unknown condition '{$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:
	$json = json_decode($condition_value, true);
	if (!is_array($json)) {
	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 )------------------------------------------------------------ */

	abstract public function getActions($rule_type);

	public function getActionNameMap($rule_type) {
	switch ($rule_type) {
	case HeraldRuleTypeConfig::RULE_TYPE_GLOBAL:
	case HeraldRuleTypeConfig::RULE_TYPE_OBJECT:
	return array(
	self::ACTION_NOTHING => pht('Do nothing'),
	self::ACTION_ADD_CC => pht('Add emails to CC'),
	self::ACTION_REMOVE_CC => pht('Remove emails from CC'),
	self::ACTION_EMAIL => pht('Send an email to'),
	self::ACTION_AUDIT => pht('Trigger an Audit by'),
	self::ACTION_FLAG => pht('Mark with flag'),
	self::ACTION_ASSIGN_TASK => pht('Assign task to'),
	self::ACTION_ADD_PROJECTS => pht('Add projects'),
	self::ACTION_ADD_REVIEWERS => pht('Add reviewers'),
	self::ACTION_ADD_BLOCKING_REVIEWERS => pht('Add blocking reviewers'),
	self::ACTION_APPLY_BUILD_PLANS => pht('Run build plans'),
	self::ACTION_BLOCK => pht('Block change with message'),
	);
	case HeraldRuleTypeConfig::RULE_TYPE_PERSONAL:
	return array(
	self::ACTION_NOTHING => pht('Do nothing'),
	self::ACTION_ADD_CC => pht('Add me to CC'),
	self::ACTION_REMOVE_CC => pht('Remove me from CC'),
	self::ACTION_EMAIL => pht('Send me an email'),
	self::ACTION_AUDIT => pht('Trigger an Audit by me'),
	self::ACTION_FLAG => pht('Mark with flag'),
	self::ACTION_ASSIGN_TASK => pht('Assign task to me'),
	self::ACTION_ADD_PROJECTS => pht('Add projects'),
	self::ACTION_ADD_REVIEWERS => pht('Add me as a reviewer'),
	self::ACTION_ADD_BLOCKING_REVIEWERS =>
	pht('Add me as a blocking reviewer'),
	);
	default:
	throw new Exception("Unknown rule type '{$rule_type}'!");
	}
	}

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

	$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_EMAIL:
	case self::ACTION_ADD_CC:
	case self::ACTION_REMOVE_CC:
	case self::ACTION_AUDIT:
	case self::ACTION_ASSIGN_TASK:
	case self::ACTION_ADD_REVIEWERS:
	case self::ACTION_ADD_BLOCKING_REVIEWERS:
	// For personal rules, force these actions to target the rule owner.
	$target = array($author_phid);
	break;
	case self::ACTION_FLAG:
	// Make sure flag color is valid; set to blue if not.
	$color_map = PhabricatorFlagColor::getColorNameMap();
	if (empty($color_map[$target])) {
	$target = PhabricatorFlagColor::COLOR_BLUE;
	}
	break;
	case self::ACTION_BLOCK:
	case self::ACTION_NOTHING:
	break;
	default:
	throw new HeraldInvalidActionException(
	pht(
	'Unrecognized action type "%s"!',
	$action->getAction()));
	}
	}

	$action->setTarget($target);
	}



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


	public function getValueTypeForFieldAndCondition($field, $condition) {

	if ($this->isHeraldCustomKey($field)) {
	$value_type = $this->getCustomFieldValueTypeForFieldAndCondition(
	$field,
	$condition);
	if ($value_type !== null) {
	return $value_type;
	}
	}

	switch ($condition) {
	case self::CONDITION_CONTAINS:
	case self::CONDITION_NOT_CONTAINS:
	case self::CONDITION_REGEXP:
	case self::CONDITION_REGEXP_PAIR:
	return self::VALUE_TEXT;
	case self::CONDITION_IS:
	case self::CONDITION_IS_NOT:
	switch ($field) {
	case self::FIELD_CONTENT_SOURCE:
	return self::VALUE_CONTENT_SOURCE;
	default:
	return self::VALUE_TEXT;
	}
	break;
	case self::CONDITION_IS_ANY:
	case self::CONDITION_IS_NOT_ANY:
	switch ($field) {
	case self::FIELD_REPOSITORY:
	return self::VALUE_REPOSITORY;
	case self::FIELD_TASK_PRIORITY:
	return self::VALUE_TASK_PRIORITY;
	case self::FIELD_ARCANIST_PROJECT:
	return self::VALUE_ARCANIST_PROJECT;
	default:
	return self::VALUE_USER;
	}
	break;
	case self::CONDITION_INCLUDE_ALL:
	case self::CONDITION_INCLUDE_ANY:
	case self::CONDITION_INCLUDE_NONE:
	switch ($field) {
	case self::FIELD_REPOSITORY:
	return self::VALUE_REPOSITORY;
	case self::FIELD_CC:
	return self::VALUE_EMAIL;
	case self::FIELD_TAGS:
	return self::VALUE_TAG;
	case self::FIELD_AFFECTED_PACKAGE:
	return self::VALUE_OWNERS_PACKAGE;
	case self::FIELD_AUTHOR_PROJECTS:
	case self::FIELD_PUSHER_PROJECTS:
	case self::FIELD_PROJECTS:
	case self::FIELD_REPOSITORY_PROJECTS:
	return self::VALUE_PROJECT;
	case self::FIELD_REVIEWERS:
	return self::VALUE_USER_OR_PROJECT;
	default:
	return self::VALUE_USER;
	}
	break;
	case self::CONDITION_IS_ME:
	case self::CONDITION_IS_NOT_ME:
	case self::CONDITION_EXISTS:
	case self::CONDITION_NOT_EXISTS:
	case self::CONDITION_UNCONDITIONALLY:
	case self::CONDITION_NEVER:
	case self::CONDITION_IS_TRUE:
	case self::CONDITION_IS_FALSE:
	return self::VALUE_NONE;
	case self::CONDITION_RULE:
	case self::CONDITION_NOT_RULE:
	return self::VALUE_RULE;
	default:
	throw new Exception("Unknown condition '{$condition}'.");
	}
	}

	public static function getValueTypeForAction($action, $rule_type) {
	$is_personal = ($rule_type == HeraldRuleTypeConfig::RULE_TYPE_PERSONAL);

	if ($is_personal) {
	switch ($action) {
	case self::ACTION_ADD_CC:
	case self::ACTION_REMOVE_CC:
	case self::ACTION_EMAIL:
	case self::ACTION_NOTHING:
	case self::ACTION_AUDIT:
	case self::ACTION_ASSIGN_TASK:
	case self::ACTION_ADD_REVIEWERS:
	case self::ACTION_ADD_BLOCKING_REVIEWERS:
	return self::VALUE_NONE;
	case self::ACTION_FLAG:
	return self::VALUE_FLAG_COLOR;
	case self::ACTION_ADD_PROJECTS:
	return self::VALUE_PROJECT;
	default:
	throw new Exception("Unknown or invalid action '{$action}'.");
	}
	} else {
	switch ($action) {
	case self::ACTION_ADD_CC:
	case self::ACTION_REMOVE_CC:
	case self::ACTION_EMAIL:
	return self::VALUE_EMAIL;
	case self::ACTION_NOTHING:
	return self::VALUE_NONE;
	case self::ACTION_ADD_PROJECTS:
	return self::VALUE_PROJECT;
	case self::ACTION_FLAG:
	return self::VALUE_FLAG_COLOR;
	case self::ACTION_ASSIGN_TASK:
	return self::VALUE_USER;
	case self::ACTION_AUDIT:
	case self::ACTION_ADD_REVIEWERS:
	case self::ACTION_ADD_BLOCKING_REVIEWERS:
	return self::VALUE_USER_OR_PROJECT;
	case self::ACTION_APPLY_BUILD_PLANS:
	return self::VALUE_BUILD_PLAN;
	case self::ACTION_BLOCK:
	return self::VALUE_TEXT;
	default:
	throw new Exception("Unknown or invalid action '{$action}'.");
	}
	}
	}


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


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


	public static function applyFlagEffect(HeraldEffect $effect, $phid) {
	$color = $effect->getTarget();

	// TODO: Silly that we need to load this again here.
	$rule = id(new HeraldRule())->load($effect->getRuleID());
	$user = id(new PhabricatorUser())->loadOneWhere(
	'phid = %s',
	$rule->getAuthorPHID());

	$flag = PhabricatorFlagQuery::loadUserFlag($user, $phid);
	if ($flag) {
	return new HeraldApplyTranscript(
	$effect,
	false,
	pht('Object already flagged.'));
	}

	$handle = id(new PhabricatorHandleQuery())
	->setViewer($user)
	->withPHIDs(array($phid))
	->executeOne();

	$flag = new PhabricatorFlag();
	$flag->setOwnerPHID($user->getPHID());
	$flag->setType($handle->getType());
	$flag->setObjectPHID($handle->getPHID());

	// TOOD: Should really be transcript PHID, but it doesn't exist yet.
	$flag->setReasonPHID($user->getPHID());

	$flag->setColor($color);
	$flag->setNote(
	pht('Flagged by Herald Rule "%s".', $rule->getName()));
	$flag->save();

	return new HeraldApplyTranscript(
	$effect,
	true,
	pht('Added flag.'));
	}

	public static function getAllAdapters() {
	static $adapters;
	if (!$adapters) {
	$adapters = id(new PhutilSymbolLoader())
	->setAncestorClass(__CLASS__)
	->loadObjects();
	$adapters = msort($adapters, 'getAdapterSortKey');
	}
	return $adapters;
	}

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

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

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

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

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

	return $map;
	}

	public function renderRuleAsText(HeraldRule $rule, array $handles) {
	assert_instances_of($handles, 'PhabricatorObjectHandle');

	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)));
	}

	$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,
	$this->renderActionAsText($action, $handles))); }

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

	private function renderConditionAsText(
	HeraldCondition $condition,
	array $handles) {

	$field_type = $condition->getFieldName();

	$default = $this->isHeraldCustomKey($field_type)
	? pht('(Unknown Custom Field "%s")', $field_type)
	: pht('(Unknown Field "%s")', $field_type);

	$field_name = idx($this->getFieldNameMap(), $field_type, $default);

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

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

	return hsprintf(' %s %s %s', $field_name, $condition_name, $value);
	}

	private function renderActionAsText(
	HeraldAction $action,
	array $handles) {
	$rule_global = HeraldRuleTypeConfig::RULE_TYPE_GLOBAL;

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

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

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

	private function renderConditionValueAsText(
	HeraldCondition $condition,
	array $handles) {

	$value = $condition->getValue();
	if (!is_array($value)) {
	$value = array($value);
	}
	switch ($condition->getFieldName()) {
	case self::FIELD_TASK_PRIORITY:
	$priority_map = ManiphestTaskPriority::getTaskPriorityMap();
	foreach ($value as $index => $val) {
	$name = idx($priority_map, $val);
	if ($name) {
	$value[$index] = $name;
	}
	}
	break;
	case HeraldPreCommitRefAdapter::FIELD_REF_CHANGE:
	$change_map =
	PhabricatorRepositoryPushLog::getHeraldChangeFlagConditionOptions();
	foreach ($value as $index => $val) {
	$name = idx($change_map, $val);
	if ($name) {
	$value[$index] = $name;
	}
	}
	break;
	default:
	foreach ($value as $index => $val) {
	$handle = idx($handles, $val);
	if ($handle) {
	$value[$index] = $handle->renderLink();
	}
	}
	break;
	}
	$value = phutil_implode_html(', ', $value);
	return $value;
	}

	private function renderActionTargetAsText(
	HeraldAction $action,
	array $handles) {

	$target = $action->getTarget();
	if (!is_array($target)) {
	$target = array($target);
	}
	foreach ($target as $index => $val) {
	switch ($action->getAction()) {
	case self::ACTION_FLAG:
	$target[$index] = PhabricatorFlagColor::getColorName($val);
	break;
	default:
	$handle = idx($handles, $val);
	if ($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;
	}

	/* -( Custom Field Integration )------------------------------------------- */


	/**
	* Return an object which custom fields can be generated from while editing
	* rules. Adapters must return an object from this method to enable custom
	* field rules.
	*
	* Normally, you'll return an empty version of the adapted object, assuming
	* it implements @{interface:PhabricatorCustomFieldInterface}:
	*
	* return new ApplicationObject();
	*
	* This is normally the only adapter method you need to override to enable
	* Herald rules to run against custom fields.
	*
	* @return null\|PhabricatorCustomFieldInterface Template object.
	* @task customfield
	*/
	protected function getCustomFieldTemplateObject() {
	return null;
	}


	/**
	* Returns the prefix used to namespace Herald fields which are based on
	* custom fields.
	*
	* @return string Key prefix.
	* @task customfield
	*/
	private function getCustomKeyPrefix() {
	return 'herald.custom/';
	}


	/**
	* Determine if a field key is based on a custom field or a regular internal
	* field.
	*
	* @param string Field key.
	* @return bool True if the field key is based on a custom field.
	* @task customfield
	*/
	private function isHeraldCustomKey($key) {
	$prefix = $this->getCustomKeyPrefix();
	return (strncmp($key, $prefix, strlen($prefix)) == 0);
	}


	/**
	* Convert a custom field key into a Herald field key.
	*
	* @param string Custom field key.
	* @return string Herald field key.
	* @task customfield
	*/
	private function getHeraldKeyFromCustomKey($key) {
	return $this->getCustomKeyPrefix().$key;
	}


	/**
	* Get custom fields for this adapter, if appliable. This will either return
	* a field list or `null` if the adapted object does not implement custom
	* fields or the adapter does not support them.
	*
	* @return PhabricatorCustomFieldList\|null List of fields, or `null`.
	* @task customfield
	*/
	private function getCustomFields() {
	if ($this->customFields === false) {
	$this->customFields = null;


	$template_object = $this->getCustomFieldTemplateObject();
	if ($template_object) {
	$object = $this->getObject();
	if (!$object) {
	$object = $template_object;
	}

	$fields = PhabricatorCustomField::getObjectFields(
	$object,
	PhabricatorCustomField::ROLE_HERALD);
	$fields->setViewer(PhabricatorUser::getOmnipotentUser());
	$fields->readFieldsFromStorage($object);

	$this->customFields = $fields;
	}
	}

	return $this->customFields;
	}


	/**
	* Get a custom field by Herald field key, or `null` if it does not exist
	* or custom fields are not supported.
	*
	* @param string Herald field key.
	* @return PhabricatorCustomField\|null Matching field, if it exists.
	* @task customfield
	*/
	private function getCustomField($herald_field_key) {
	$fields = $this->getCustomFields();
	if (!$fields) {
	return null;
	}

	foreach ($fields->getFields() as $custom_field) {
	$key = $custom_field->getFieldKey();
	if ($this->getHeraldKeyFromCustomKey($key) == $herald_field_key) {
	return $custom_field;
	}
	}

	return null;
	}


	/**
	* Get the field map for custom fields.
	*
	* @return map<string, string> Map of Herald field keys to field names.
	* @task customfield
	*/
	private function getCustomFieldNameMap() {
	$fields = $this->getCustomFields();
	if (!$fields) {
	return array();
	}

	$map = array();
	foreach ($fields->getFields() as $field) {
	$key = $field->getFieldKey();
	$name = $field->getHeraldFieldName();
	$map[$this->getHeraldKeyFromCustomKey($key)] = $name;
	}

	return $map;
	}


	/**
	* Get the value for a custom field.
	*
	* @param string Herald field key.
	* @return wild Custom field value.
	* @task customfield
	*/
	private function getCustomFieldValue($field_key) {
	$field = $this->getCustomField($field_key);
	if (!$field) {
	return null;
	}

	return $field->getHeraldFieldValue();
	}


	/**
	* Get the Herald conditions for a custom field.
	*
	* @param string Herald field key.
	* @return list<const> List of Herald conditions.
	* @task customfield
	*/
	private function getCustomFieldConditions($field_key) {
	$field = $this->getCustomField($field_key);
	if (!$field) {
	return array(
	self::CONDITION_NEVER,
	);
	}

	return $field->getHeraldFieldConditions();
	}


	/**
	* Get the Herald value type for a custom field and condition.
	*
	* @param string Herald field key.
	* @param const Herald condition constant.
	* @return const\|null Herald value type constant, or null to use the default.
	* @task customfield
	*/
	private function getCustomFieldValueTypeForFieldAndCondition(
	$field_key,
	$condition) {

	$field = $this->getCustomField($field_key);
	if (!$field) {
	return self::VALUE_NONE;
	}

	return $field->getHeraldFieldValueType($condition);
	}


	}

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