D19045.diff
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	diff --git a/bin/webhook b/bin/webhook
	new file mode 120000
	--- /dev/null
	+++ b/bin/webhook
	@@ -0,0 +1 @@
	+../scripts/setup/manage_webhook.php
	\ No newline at end of file
	diff --git a/resources/sql/autopatches/20180209.hook.01.hook.sql b/resources/sql/autopatches/20180209.hook.01.hook.sql
	new file mode 100644
	--- /dev/null
	+++ b/resources/sql/autopatches/20180209.hook.01.hook.sql
	@@ -0,0 +1,12 @@
	+CREATE TABLE {$NAMESPACE}_herald.herald_webhook (
	+ id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
	+ phid VARBINARY(64) NOT NULL,
	+ name VARCHAR(128) NOT NULL COLLATE {$COLLATE_TEXT},
	+ webhookURI VARCHAR(255) NOT NULL COLLATE {$COLLATE_TEXT},
	+ viewPolicy VARBINARY(64) NOT NULL,
	+ editPolicy VARBINARY(64) NOT NULL,
	+ status VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
	+ hmacKey VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
	+ dateCreated INT UNSIGNED NOT NULL,
	+ dateModified INT UNSIGNED NOT NULL
	+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
	diff --git a/resources/sql/autopatches/20180209.hook.02.hookxaction.sql b/resources/sql/autopatches/20180209.hook.02.hookxaction.sql
	new file mode 100644
	--- /dev/null
	+++ b/resources/sql/autopatches/20180209.hook.02.hookxaction.sql
	@@ -0,0 +1,19 @@
	+CREATE TABLE {$NAMESPACE}_herald.herald_webhooktransaction (
	+ id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
	+ phid VARBINARY(64) NOT NULL,
	+ authorPHID VARBINARY(64) NOT NULL,
	+ objectPHID VARBINARY(64) NOT NULL,
	+ viewPolicy VARBINARY(64) NOT NULL,
	+ editPolicy VARBINARY(64) NOT NULL,
	+ commentPHID VARBINARY(64) DEFAULT NULL,
	+ commentVersion INT UNSIGNED NOT NULL,
	+ transactionType VARCHAR(32) COLLATE {$COLLATE_TEXT} NOT NULL,
	+ oldValue LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
	+ newValue LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
	+ contentSource LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
	+ metadata LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
	+ dateCreated INT UNSIGNED NOT NULL,
	+ dateModified INT UNSIGNED NOT NULL,
	+ UNIQUE KEY `key_phid` (`phid`),
	+ KEY `key_object` (`objectPHID`)
	+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
	diff --git a/resources/sql/autopatches/20180209.hook.03.hookrequest.sql b/resources/sql/autopatches/20180209.hook.03.hookrequest.sql
	new file mode 100644
	--- /dev/null
	+++ b/resources/sql/autopatches/20180209.hook.03.hookrequest.sql
	@@ -0,0 +1,12 @@
	+CREATE TABLE {$NAMESPACE}_herald.herald_webhookrequest (
	+ id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
	+ phid VARBINARY(64) NOT NULL,
	+ webhookPHID VARBINARY(64) NOT NULL,
	+ objectPHID VARBINARY(64) NOT NULL,
	+ status VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
	+ properties LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
	+ lastRequestResult VARCHAR(32) NOT NULL COLLATE {$COLLATE_TEXT},
	+ lastRequestEpoch INT UNSIGNED NOT NULL,
	+ dateCreated INT UNSIGNED NOT NULL,
	+ dateModified INT UNSIGNED NOT NULL
	+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
	diff --git a/scripts/setup/manage_webhook.php b/scripts/setup/manage_webhook.php
	new file mode 100755
	--- /dev/null
	+++ b/scripts/setup/manage_webhook.php
	@@ -0,0 +1,21 @@
	+#!/usr/bin/env php
	+<?php
	+
	+$root = dirname(dirname(dirname(__FILE__)));
	+require_once $root.'/scripts/init/init-script.php';
	+
	+$args = new PhutilArgumentParser($argv);
	+$args->setTagline(pht('manage webhooks'));
	+$args->setSynopsis(<<<EOSYNOPSIS
	+webhook __command__ [__options__]
	+ Manage webhooks.
	+
	+EOSYNOPSIS
	+ );
	+$args->parseStandardArguments();
	+
	+$workflows = id(new PhutilClassMapQuery())
	+ ->setAncestorClass('HeraldWebhookManagementWorkflow')
	+ ->execute();
	+$workflows[] = new PhutilHelpArgumentWorkflow();
	+$args->parseWorkflows($workflows);
	diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
	--- a/src/__phutil_library_map__.php
	+++ b/src/__phutil_library_map__.php
	@@ -1364,6 +1364,7 @@
	'HeraldContentSourceField' => 'applications/herald/field/HeraldContentSourceField.php',
	'HeraldController' => 'applications/herald/controller/HeraldController.php',
	'HeraldCoreStateReasons' => 'applications/herald/state/HeraldCoreStateReasons.php',
	+ 'HeraldCreateWebhooksCapability' => 'applications/herald/capability/HeraldCreateWebhooksCapability.php',
	'HeraldDAO' => 'applications/herald/storage/HeraldDAO.php',
	'HeraldDeprecatedFieldGroup' => 'applications/herald/field/HeraldDeprecatedFieldGroup.php',
	'HeraldDifferentialAdapter' => 'applications/differential/herald/HeraldDifferentialAdapter.php',
	@@ -1440,6 +1441,30 @@
	'HeraldTranscriptSearchEngine' => 'applications/herald/query/HeraldTranscriptSearchEngine.php',
	'HeraldTranscriptTestCase' => 'applications/herald/storage/__tests__/HeraldTranscriptTestCase.php',
	'HeraldUtilityActionGroup' => 'applications/herald/action/HeraldUtilityActionGroup.php',
	+ 'HeraldWebhook' => 'applications/herald/storage/HeraldWebhook.php',
	+ 'HeraldWebhookCallManagementWorkflow' => 'applications/herald/management/HeraldWebhookCallManagementWorkflow.php',
	+ 'HeraldWebhookController' => 'applications/herald/controller/HeraldWebhookController.php',
	+ 'HeraldWebhookEditController' => 'applications/herald/controller/HeraldWebhookEditController.php',
	+ 'HeraldWebhookEditEngine' => 'applications/herald/editor/HeraldWebhookEditEngine.php',
	+ 'HeraldWebhookEditor' => 'applications/herald/editor/HeraldWebhookEditor.php',
	+ 'HeraldWebhookListController' => 'applications/herald/controller/HeraldWebhookListController.php',
	+ 'HeraldWebhookManagementWorkflow' => 'applications/herald/management/HeraldWebhookManagementWorkflow.php',
	+ 'HeraldWebhookNameTransaction' => 'applications/herald/xaction/HeraldWebhookNameTransaction.php',
	+ 'HeraldWebhookPHIDType' => 'applications/herald/phid/HeraldWebhookPHIDType.php',
	+ 'HeraldWebhookQuery' => 'applications/herald/query/HeraldWebhookQuery.php',
	+ 'HeraldWebhookRequest' => 'applications/herald/storage/HeraldWebhookRequest.php',
	+ 'HeraldWebhookRequestListView' => 'applications/herald/view/HeraldWebhookRequestListView.php',
	+ 'HeraldWebhookRequestPHIDType' => 'applications/herald/phid/HeraldWebhookRequestPHIDType.php',
	+ 'HeraldWebhookRequestQuery' => 'applications/herald/query/HeraldWebhookRequestQuery.php',
	+ 'HeraldWebhookSearchEngine' => 'applications/herald/query/HeraldWebhookSearchEngine.php',
	+ 'HeraldWebhookStatusTransaction' => 'applications/herald/xaction/HeraldWebhookStatusTransaction.php',
	+ 'HeraldWebhookTestController' => 'applications/herald/controller/HeraldWebhookTestController.php',
	+ 'HeraldWebhookTransaction' => 'applications/herald/storage/HeraldWebhookTransaction.php',
	+ 'HeraldWebhookTransactionQuery' => 'applications/herald/query/HeraldWebhookTransactionQuery.php',
	+ 'HeraldWebhookTransactionType' => 'applications/herald/xaction/HeraldWebhookTransactionType.php',
	+ 'HeraldWebhookURITransaction' => 'applications/herald/xaction/HeraldWebhookURITransaction.php',
	+ 'HeraldWebhookViewController' => 'applications/herald/controller/HeraldWebhookViewController.php',
	+ 'HeraldWebhookWorker' => 'applications/herald/worker/HeraldWebhookWorker.php',
	'Javelin' => 'infrastructure/javelin/Javelin.php',
	'LegalpadController' => 'applications/legalpad/controller/LegalpadController.php',
	'LegalpadCreateDocumentsCapability' => 'applications/legalpad/capability/LegalpadCreateDocumentsCapability.php',
	@@ -6614,6 +6639,7 @@
	'HeraldContentSourceField' => 'HeraldField',
	'HeraldController' => 'PhabricatorController',
	'HeraldCoreStateReasons' => 'HeraldStateReasons',
	+ 'HeraldCreateWebhooksCapability' => 'PhabricatorPolicyCapability',
	'HeraldDAO' => 'PhabricatorLiskDAO',
	'HeraldDeprecatedFieldGroup' => 'HeraldFieldGroup',
	'HeraldDifferentialAdapter' => 'HeraldAdapter',
	@@ -6704,6 +6730,39 @@
	'HeraldTranscriptSearchEngine' => 'PhabricatorApplicationSearchEngine',
	'HeraldTranscriptTestCase' => 'PhabricatorTestCase',
	'HeraldUtilityActionGroup' => 'HeraldActionGroup',
	+ 'HeraldWebhook' => array(
	+ 'HeraldDAO',
	+ 'PhabricatorPolicyInterface',
	+ 'PhabricatorApplicationTransactionInterface',
	+ 'PhabricatorDestructibleInterface',
	+ ),
	+ 'HeraldWebhookCallManagementWorkflow' => 'HeraldWebhookManagementWorkflow',
	+ 'HeraldWebhookController' => 'HeraldController',
	+ 'HeraldWebhookEditController' => 'HeraldWebhookController',
	+ 'HeraldWebhookEditEngine' => 'PhabricatorEditEngine',
	+ 'HeraldWebhookEditor' => 'PhabricatorApplicationTransactionEditor',
	+ 'HeraldWebhookListController' => 'HeraldWebhookController',
	+ 'HeraldWebhookManagementWorkflow' => 'PhabricatorManagementWorkflow',
	+ 'HeraldWebhookNameTransaction' => 'HeraldWebhookTransactionType',
	+ 'HeraldWebhookPHIDType' => 'PhabricatorPHIDType',
	+ 'HeraldWebhookQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
	+ 'HeraldWebhookRequest' => array(
	+ 'HeraldDAO',
	+ 'PhabricatorPolicyInterface',
	+ 'PhabricatorExtendedPolicyInterface',
	+ ),
	+ 'HeraldWebhookRequestListView' => 'AphrontView',
	+ 'HeraldWebhookRequestPHIDType' => 'PhabricatorPHIDType',
	+ 'HeraldWebhookRequestQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
	+ 'HeraldWebhookSearchEngine' => 'PhabricatorApplicationSearchEngine',
	+ 'HeraldWebhookStatusTransaction' => 'HeraldWebhookTransactionType',
	+ 'HeraldWebhookTestController' => 'HeraldWebhookController',
	+ 'HeraldWebhookTransaction' => 'PhabricatorModularTransaction',
	+ 'HeraldWebhookTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
	+ 'HeraldWebhookTransactionType' => 'PhabricatorModularTransactionType',
	+ 'HeraldWebhookURITransaction' => 'HeraldWebhookTransactionType',
	+ 'HeraldWebhookViewController' => 'HeraldWebhookController',
	+ 'HeraldWebhookWorker' => 'PhabricatorWorker',
	'Javelin' => 'Phobject',
	'LegalpadController' => 'PhabricatorController',
	'LegalpadCreateDocumentsCapability' => 'PhabricatorPolicyCapability',
	diff --git a/src/applications/herald/application/PhabricatorHeraldApplication.php b/src/applications/herald/application/PhabricatorHeraldApplication.php
	--- a/src/applications/herald/application/PhabricatorHeraldApplication.php
	+++ b/src/applications/herald/application/PhabricatorHeraldApplication.php
	@@ -62,6 +62,17 @@
	'(?P<id>[1-9]\d*)/'
	=> 'HeraldTranscriptController',
	),
	+ 'webhook/' => array(
	+ $this->getQueryRoutePattern() => 'HeraldWebhookListController',
	+ 'view/(?P<id>\d+)/(?:request/(?P<requestID>[^/]+)/)?' =>
	+ 'HeraldWebhookViewController',
	+ $this->getEditRoutePattern('edit/') => 'HeraldWebhookEditController',
	+ 'test/(?P<id>\d+)/' => 'HeraldWebhookTestController',
	+ 'key/' => array(
	+ 'view/(?P<id>\d+)/' => 'HeraldWebhookViewKeyController',
	+ 'cycle/(?P<id>\d+)/' => 'HeraldWebhookCycleKeyController',
	+ ),
	+ ),
	),
	);
	}
	@@ -72,6 +83,9 @@
	'caption' => pht('Global rules can bypass access controls.'),
	'default' => PhabricatorPolicies::POLICY_ADMIN,
	),
	+ HeraldCreateWebhooksCapability::CAPABILITY => array(
	+ 'default' => PhabricatorPolicies::POLICY_ADMIN,
	+ ),
	);
	}

	diff --git a/src/applications/herald/capability/HeraldCreateWebhooksCapability.php b/src/applications/herald/capability/HeraldCreateWebhooksCapability.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/capability/HeraldCreateWebhooksCapability.php
	@@ -0,0 +1,16 @@
	+<?php
	+
	+final class HeraldCreateWebhooksCapability
	+ extends PhabricatorPolicyCapability {
	+
	+ const CAPABILITY = 'herald.webhooks';
	+
	+ public function getCapabilityName() {
	+ return pht('Can Create Webhooks');
	+ }
	+
	+ public function describeCapabilityRejection() {
	+ return pht('You do not have permission to create webhooks.');
	+ }
	+
	+}
	diff --git a/src/applications/herald/controller/HeraldController.php b/src/applications/herald/controller/HeraldController.php
	--- a/src/applications/herald/controller/HeraldController.php
	+++ b/src/applications/herald/controller/HeraldController.php
	@@ -6,18 +6,6 @@
	return $this->buildSideNavView()->getMenu();
	}

	- protected function buildApplicationCrumbs() {
	- $crumbs = parent::buildApplicationCrumbs();
	-
	- $crumbs->addAction(
	- id(new PHUIListItemView())
	- ->setName(pht('Create Herald Rule'))
	- ->setHref($this->getApplicationURI('create/'))
	- ->setIcon('fa-plus-square'));
	-
	- return $crumbs;
	- }
	-
	public function buildSideNavView() {
	$viewer = $this->getViewer();

	@@ -29,8 +17,11 @@
	->addNavigationItems($nav->getMenu());

	$nav->addLabel(pht('Utilities'))
	- ->addFilter('test', pht('Test Console'))
	- ->addFilter('transcript', pht('Transcripts'));
	+ ->addFilter('test', pht('Test Console'))
	+ ->addFilter('transcript', pht('Transcripts'));
	+
	+ $nav->addLabel(pht('Webhooks'))
	+ ->addFilter('webhook', pht('Webhooks'));

	$nav->selectFilter(null);

	diff --git a/src/applications/herald/controller/HeraldRuleListController.php b/src/applications/herald/controller/HeraldRuleListController.php
	--- a/src/applications/herald/controller/HeraldRuleListController.php
	+++ b/src/applications/herald/controller/HeraldRuleListController.php
	@@ -17,5 +17,16 @@
	return $this->delegateToController($controller);
	}

	+ protected function buildApplicationCrumbs() {
	+ $crumbs = parent::buildApplicationCrumbs();
	+
	+ $crumbs->addAction(
	+ id(new PHUIListItemView())
	+ ->setName(pht('Create Herald Rule'))
	+ ->setHref($this->getApplicationURI('create/'))
	+ ->setIcon('fa-plus-square'));
	+
	+ return $crumbs;
	+ }

	}
	diff --git a/src/applications/herald/controller/HeraldWebhookController.php b/src/applications/herald/controller/HeraldWebhookController.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/controller/HeraldWebhookController.php
	@@ -0,0 +1,15 @@
	+<?php
	+
	+abstract class HeraldWebhookController extends HeraldController {
	+
	+ protected function buildApplicationCrumbs() {
	+ $crumbs = parent::buildApplicationCrumbs();
	+
	+ $crumbs->addTextCrumb(
	+ pht('Webhooks'),
	+ $this->getApplicationURI('webhook/'));
	+
	+ return $crumbs;
	+ }
	+
	+}
	diff --git a/src/applications/herald/controller/HeraldWebhookEditController.php b/src/applications/herald/controller/HeraldWebhookEditController.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/controller/HeraldWebhookEditController.php
	@@ -0,0 +1,12 @@
	+<?php
	+
	+final class HeraldWebhookEditController
	+ extends HeraldWebhookController {
	+
	+ public function handleRequest(AphrontRequest $request) {
	+ return id(new HeraldWebhookEditEngine())
	+ ->setController($this)
	+ ->buildResponse();
	+ }
	+
	+}
	diff --git a/src/applications/herald/controller/HeraldWebhookListController.php b/src/applications/herald/controller/HeraldWebhookListController.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/controller/HeraldWebhookListController.php
	@@ -0,0 +1,26 @@
	+<?php
	+
	+final class HeraldWebhookListController
	+ extends HeraldWebhookController {
	+
	+ public function shouldAllowPublic() {
	+ return true;
	+ }
	+
	+ public function handleRequest(AphrontRequest $request) {
	+ return id(new HeraldWebhookSearchEngine())
	+ ->setController($this)
	+ ->buildResponse();
	+ }
	+
	+ protected function buildApplicationCrumbs() {
	+ $crumbs = parent::buildApplicationCrumbs();
	+
	+ id(new HeraldWebhookEditEngine())
	+ ->setViewer($this->getViewer())
	+ ->addActionToCrumbs($crumbs);
	+
	+ return $crumbs;
	+ }
	+
	+}
	diff --git a/src/applications/herald/controller/HeraldWebhookTestController.php b/src/applications/herald/controller/HeraldWebhookTestController.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/controller/HeraldWebhookTestController.php
	@@ -0,0 +1,45 @@
	+<?php
	+
	+final class HeraldWebhookTestController
	+ extends HeraldWebhookController {
	+
	+ public function handleRequest(AphrontRequest $request) {
	+ $viewer = $this->getViewer();
	+
	+ $hook = id(new HeraldWebhookQuery())
	+ ->setViewer($viewer)
	+ ->withIDs(array($request->getURIData('id')))
	+ ->requireCapabilities(
	+ array(
	+ PhabricatorPolicyCapability::CAN_VIEW,
	+ PhabricatorPolicyCapability::CAN_EDIT,
	+ ))
	+ ->executeOne();
	+ if (!$hook) {
	+ return new Aphront404Response();
	+ }
	+
	+ if ($request->isFormPost()) {
	+ $object = $hook;
	+
	+ $request = HeraldWebhookRequest::initializeNewWebhookRequest($hook)
	+ ->setObjectPHID($object->getPHID())
	+ ->save();
	+
	+ $request->queueCall();
	+
	+ $next_uri = $hook->getURI().'request/'.$request->getID().'/';
	+
	+ return id(new AphrontRedirectResponse())->setURI($next_uri);
	+ }
	+
	+ return $this->newDialog()
	+ ->setTitle(pht('New Test Request'))
	+ ->appendParagraph(
	+ pht('This will make a new test request to the configured URI.'))
	+ ->addCancelButton($hook->getURI())
	+ ->addSubmitButton(pht('Make Request'));
	+ }
	+
	+
	+}
	diff --git a/src/applications/herald/controller/HeraldWebhookViewController.php b/src/applications/herald/controller/HeraldWebhookViewController.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/controller/HeraldWebhookViewController.php
	@@ -0,0 +1,160 @@
	+<?php
	+
	+final class HeraldWebhookViewController
	+ extends HeraldWebhookController {
	+
	+ public function shouldAllowPublic() {
	+ return true;
	+ }
	+
	+ public function handleRequest(AphrontRequest $request) {
	+ $viewer = $this->getViewer();
	+
	+ $hook = id(new HeraldWebhookQuery())
	+ ->setViewer($viewer)
	+ ->withIDs(array($request->getURIData('id')))
	+ ->executeOne();
	+ if (!$hook) {
	+ return new Aphront404Response();
	+ }
	+
	+ $header = $this->buildHeaderView($hook);
	+
	+ $warnings = null;
	+ if ($hook->isInErrorBackoff($viewer)) {
	+ $message = pht(
	+ 'Many requests to this webhook have failed recently (at least %s '.
	+ 'errors in the last %s seconds). New requests are temporarily paused.',
	+ $hook->getErrorBackoffThreshold(),
	+ $hook->getErrorBackoffWindow());
	+
	+ $warnings = id(new PHUIInfoView())
	+ ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
	+ ->setErrors(
	+ array(
	+ $message,
	+ ));
	+ }
	+
	+ $curtain = $this->buildCurtain($hook);
	+ $properties_view = $this->buildPropertiesView($hook);
	+
	+ $timeline = $this->buildTransactionTimeline(
	+ $hook,
	+ new HeraldWebhookTransactionQuery());
	+ $timeline->setShouldTerminate(true);
	+
	+ $requests = id(new HeraldWebhookRequestQuery())
	+ ->setViewer($viewer)
	+ ->withWebhookPHIDs(array($hook->getPHID()))
	+ ->setLimit(20)
	+ ->execute();
	+
	+ $requests_table = id(new HeraldWebhookRequestListView())
	+ ->setViewer($viewer)
	+ ->setRequests($requests)
	+ ->setHighlightID($request->getURIData('requestID'));
	+
	+ $requests_view = id(new PHUIObjectBoxView())
	+ ->setHeaderText(pht('Recent Requests'))
	+ ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
	+ ->setTable($requests_table);
	+
	+ $hook_view = id(new PHUITwoColumnView())
	+ ->setHeader($header)
	+ ->setMainColumn(
	+ array(
	+ $warnings,
	+ $properties_view,
	+ $requests_view,
	+ $timeline,
	+ ))
	+ ->setCurtain($curtain);
	+
	+ $crumbs = $this->buildApplicationCrumbs()
	+ ->addTextCrumb(pht('Webhook %d', $hook->getID()))
	+ ->setBorder(true);
	+
	+ return $this->newPage()
	+ ->setTitle(
	+ array(
	+ pht('Webhook %d', $hook->getID()),
	+ $hook->getName(),
	+ ))
	+ ->setCrumbs($crumbs)
	+ ->setPageObjectPHIDs(
	+ array(
	+ $hook->getPHID(),
	+ ))
	+ ->appendChild($hook_view);
	+ }
	+
	+ private function buildHeaderView(HeraldWebhook $hook) {
	+ $viewer = $this->getViewer();
	+
	+ $title = $hook->getName();
	+
	+ $header = id(new PHUIHeaderView())
	+ ->setHeader($title)
	+ ->setViewer($viewer)
	+ ->setPolicyObject($hook)
	+ ->setHeaderIcon('fa-cloud-upload');
	+
	+ return $header;
	+ }
	+
	+
	+ private function buildCurtain(HeraldWebhook $hook) {
	+ $viewer = $this->getViewer();
	+ $curtain = $this->newCurtainView($hook);
	+
	+ $can_edit = PhabricatorPolicyFilter::hasCapability(
	+ $viewer,
	+ $hook,
	+ PhabricatorPolicyCapability::CAN_EDIT);
	+
	+ $id = $hook->getID();
	+ $edit_uri = $this->getApplicationURI("webhook/edit/{$id}/");
	+ $test_uri = $this->getApplicationURI("webhook/test/{$id}/");
	+
	+ $curtain->addAction(
	+ id(new PhabricatorActionView())
	+ ->setName(pht('Edit Webhook'))
	+ ->setIcon('fa-pencil')
	+ ->setDisabled(!$can_edit)
	+ ->setWorkflow(!$can_edit)
	+ ->setHref($edit_uri));
	+
	+ $curtain->addAction(
	+ id(new PhabricatorActionView())
	+ ->setName(pht('New Test Request'))
	+ ->setIcon('fa-cloud-upload')
	+ ->setDisabled(!$can_edit)
	+ ->setWorkflow(true)
	+ ->setHref($test_uri));
	+
	+ return $curtain;
	+ }
	+
	+
	+ private function buildPropertiesView(HeraldWebhook $hook) {
	+ $viewer = $this->getViewer();
	+
	+ $properties = id(new PHUIPropertyListView())
	+ ->setViewer($viewer);
	+
	+ $properties->addProperty(
	+ pht('URI'),
	+ $hook->getWebhookURI());
	+
	+ $properties->addProperty(
	+ pht('Status'),
	+ $hook->getStatusDisplayName());
	+
	+ return id(new PHUIObjectBoxView())
	+ ->setHeaderText(pht('Details'))
	+ ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
	+ ->appendChild($properties);
	+ }
	+
	+}
	diff --git a/src/applications/herald/editor/HeraldWebhookEditEngine.php b/src/applications/herald/editor/HeraldWebhookEditEngine.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/editor/HeraldWebhookEditEngine.php
	@@ -0,0 +1,105 @@
	+<?php
	+
	+final class HeraldWebhookEditEngine
	+ extends PhabricatorEditEngine {
	+
	+ const ENGINECONST = 'herald.webhook';
	+
	+ public function isEngineConfigurable() {
	+ return false;
	+ }
	+
	+ public function getEngineName() {
	+ return pht('Webhooks');
	+ }
	+
	+ public function getSummaryHeader() {
	+ return pht('Edit Webhook Configurations');
	+ }
	+
	+ public function getSummaryText() {
	+ return pht('This engine is used to edit webhooks.');
	+ }
	+
	+ public function getEngineApplicationClass() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+ protected function newEditableObject() {
	+ $viewer = $this->getViewer();
	+ return HeraldWebhook::initializeNewWebhook($viewer);
	+ }
	+
	+ protected function newObjectQuery() {
	+ return new HeraldWebhookQuery();
	+ }
	+
	+ protected function getObjectCreateTitleText($object) {
	+ return pht('Create Webhook');
	+ }
	+
	+ protected function getObjectCreateButtonText($object) {
	+ return pht('Create Webhook');
	+ }
	+
	+ protected function getObjectEditTitleText($object) {
	+ return pht('Edit Webhook: %s', $object->getName());
	+ }
	+
	+ protected function getObjectEditShortText($object) {
	+ return pht('Edit Webhook');
	+ }
	+
	+ protected function getObjectCreateShortText() {
	+ return pht('Create Webhook');
	+ }
	+
	+ protected function getObjectName() {
	+ return pht('Webhook');
	+ }
	+
	+ protected function getEditorURI() {
	+ return '/herald/webhook/edit/';
	+ }
	+
	+ protected function getObjectCreateCancelURI($object) {
	+ return '/herald/webhook/';
	+ }
	+
	+ protected function getObjectViewURI($object) {
	+ return $object->getURI();
	+ }
	+
	+ protected function getCreateNewObjectPolicy() {
	+ return $this->getApplication()->getPolicy(
	+ HeraldCreateWebhooksCapability::CAPABILITY);
	+ }
	+
	+ protected function buildCustomEditFields($object) {
	+ return array(
	+ id(new PhabricatorTextEditField())
	+ ->setKey('name')
	+ ->setLabel(pht('Name'))
	+ ->setDescription(pht('Name of the webhook.'))
	+ ->setTransactionType(HeraldWebhookNameTransaction::TRANSACTIONTYPE)
	+ ->setIsRequired(true)
	+ ->setValue($object->getName()),
	+ id(new PhabricatorTextEditField())
	+ ->setKey('uri')
	+ ->setLabel(pht('URI'))
	+ ->setDescription(pht('URI for the webhook.'))
	+ ->setTransactionType(HeraldWebhookURITransaction::TRANSACTIONTYPE)
	+ ->setIsRequired(true)
	+ ->setValue($object->getWebhookURI()),
	+ id(new PhabricatorSelectEditField())
	+ ->setKey('status')
	+ ->setLabel(pht('Status'))
	+ ->setDescription(pht('Status mode for the webhook.'))
	+ ->setTransactionType(HeraldWebhookStatusTransaction::TRANSACTIONTYPE)
	+ ->setOptions(HeraldWebhook::getStatusDisplayNameMap())
	+ ->setValue($object->getStatus()),
	+
	+ );
	+ }
	+
	+}
	diff --git a/src/applications/herald/editor/HeraldWebhookEditor.php b/src/applications/herald/editor/HeraldWebhookEditor.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/editor/HeraldWebhookEditor.php
	@@ -0,0 +1,22 @@
	+<?php
	+
	+final class HeraldWebhookEditor
	+ extends PhabricatorApplicationTransactionEditor {
	+
	+ public function getEditorApplicationClass() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+ public function getEditorObjectsDescription() {
	+ return pht('Webhooks');
	+ }
	+
	+ public function getCreateObjectTitle($author, $object) {
	+ return pht('%s created this webhook.', $author);
	+ }
	+
	+ public function getCreateObjectTitleForFeed($author, $object) {
	+ return pht('%s created %s.', $author, $object);
	+ }
	+
	+}
	diff --git a/src/applications/herald/management/HeraldWebhookCallManagementWorkflow.php b/src/applications/herald/management/HeraldWebhookCallManagementWorkflow.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/management/HeraldWebhookCallManagementWorkflow.php
	@@ -0,0 +1,64 @@
	+<?php
	+
	+final class HeraldWebhookCallManagementWorkflow
	+ extends HeraldWebhookManagementWorkflow {
	+
	+ protected function didConstruct() {
	+ $this
	+ ->setName('call')
	+ ->setExamples('call --id __id__')
	+ ->setSynopsis(pht('Call a webhook.'))
	+ ->setArguments(
	+ array(
	+ array(
	+ 'name' => 'id',
	+ 'param' => 'id',
	+ 'help' => pht('Webhook ID to call'),
	+ ),
	+ ));
	+ }
	+
	+ public function execute(PhutilArgumentParser $args) {
	+ $viewer = $this->getViewer();
	+
	+ $id = $args->getArg('id');
	+ if (!$id) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Specify a webhook to call with "--id".'));
	+ }
	+
	+ $hook = id(new HeraldWebhookQuery())
	+ ->setViewer($viewer)
	+ ->withIDs(array($id))
	+ ->executeOne();
	+ if (!$hook) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Unable to load specified webhook ("%s").',
	+ $id));
	+ }
	+
	+ $object = $hook;
	+
	+ $application_phid = id(new PhabricatorHeraldApplication())->getPHID();
	+
	+ $request = HeraldWebhookRequest::initializeNewWebhookRequest($hook)
	+ ->setObjectPHID($object->getPHID())
	+ ->save();
	+
	+ PhabricatorWorker::setRunAllTasksInProcess(true);
	+ $request->queueCall();
	+
	+ $request->reload();
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ 'Success, got HTTP %s from webhook.',
	+ $request->getErrorCode()));
	+
	+ return 0;
	+ }
	+
	+}
	diff --git a/src/applications/herald/management/HeraldWebhookManagementWorkflow.php b/src/applications/herald/management/HeraldWebhookManagementWorkflow.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/management/HeraldWebhookManagementWorkflow.php
	@@ -0,0 +1,4 @@
	+<?php
	+
	+abstract class HeraldWebhookManagementWorkflow
	+ extends PhabricatorManagementWorkflow {}
	diff --git a/src/applications/herald/phid/HeraldWebhookPHIDType.php b/src/applications/herald/phid/HeraldWebhookPHIDType.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/phid/HeraldWebhookPHIDType.php
	@@ -0,0 +1,49 @@
	+<?php
	+
	+final class HeraldWebhookPHIDType extends PhabricatorPHIDType {
	+
	+ const TYPECONST = 'HWBH';
	+
	+ public function getTypeName() {
	+ return pht('Webhook');
	+ }
	+
	+ public function newObject() {
	+ return new HeraldWebhook();
	+ }
	+
	+ public function getPHIDTypeApplicationClass() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+ protected function buildQueryForObjects(
	+ PhabricatorObjectQuery $query,
	+ array $phids) {
	+
	+ return id(new HeraldWebhookQuery())
	+ ->withPHIDs($phids);
	+ }
	+
	+ public function loadHandles(
	+ PhabricatorHandleQuery $query,
	+ array $handles,
	+ array $objects) {
	+
	+ foreach ($handles as $phid => $handle) {
	+ $hook = $objects[$phid];
	+
	+ $name = $hook->getName();
	+ $id = $hook->getID();
	+
	+ $handle
	+ ->setName($name)
	+ ->setURI($hook->getURI())
	+ ->setFullName(pht('Webhook %d %s', $id, $name));
	+
	+ if ($hook->isDisabled()) {
	+ $handle->setStatus(PhabricatorObjectHandle::STATUS_CLOSED);
	+ }
	+ }
	+ }
	+
	+}
	diff --git a/src/applications/herald/phid/HeraldWebhookRequestPHIDType.php b/src/applications/herald/phid/HeraldWebhookRequestPHIDType.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/phid/HeraldWebhookRequestPHIDType.php
	@@ -0,0 +1,39 @@
	+<?php
	+
	+final class HeraldWebhookRequestPHIDType extends PhabricatorPHIDType {
	+
	+ const TYPECONST = 'HWBR';
	+
	+ public function getTypeName() {
	+ return pht('Webhook Request');
	+ }
	+
	+ public function newObject() {
	+ return new HeraldWebhook();
	+ }
	+
	+ public function getPHIDTypeApplicationClass() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+ protected function buildQueryForObjects(
	+ PhabricatorObjectQuery $query,
	+ array $phids) {
	+
	+ return id(new HeraldWebhookRequestQuery())
	+ ->withPHIDs($phids);
	+ }
	+
	+ public function loadHandles(
	+ PhabricatorHandleQuery $query,
	+ array $handles,
	+ array $objects) {
	+
	+ foreach ($handles as $phid => $handle) {
	+ $request = $objects[$phid];
	+
	+ // TODO: Fill this in.
	+ }
	+ }
	+
	+}
	diff --git a/src/applications/herald/query/HeraldWebhookQuery.php b/src/applications/herald/query/HeraldWebhookQuery.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/query/HeraldWebhookQuery.php
	@@ -0,0 +1,64 @@
	+<?php
	+
	+final class HeraldWebhookQuery
	+ extends PhabricatorCursorPagedPolicyAwareQuery {
	+
	+ private $ids;
	+ private $phids;
	+ private $statuses;
	+
	+ public function withIDs(array $ids) {
	+ $this->ids = $ids;
	+ return $this;
	+ }
	+
	+ public function withPHIDs(array $phids) {
	+ $this->phids = $phids;
	+ return $this;
	+ }
	+
	+ public function withStatuses(array $statuses) {
	+ $this->statuses = $statuses;
	+ return $this;
	+ }
	+
	+ public function newResultObject() {
	+ return new HeraldWebhook();
	+ }
	+
	+ protected function loadPage() {
	+ return $this->loadStandardPage($this->newResultObject());
	+ }
	+
	+ protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
	+ $where = parent::buildWhereClauseParts($conn);
	+
	+ if ($this->ids !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'id IN (%Ld)',
	+ $this->ids);
	+ }
	+
	+ if ($this->phids !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'phid IN (%Ls)',
	+ $this->phids);
	+ }
	+
	+ if ($this->statuses !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'status IN (%Ls)',
	+ $this->statuses);
	+ }
	+
	+ return $where;
	+ }
	+
	+ public function getQueryApplicationClass() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+}
	diff --git a/src/applications/herald/query/HeraldWebhookRequestQuery.php b/src/applications/herald/query/HeraldWebhookRequestQuery.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/query/HeraldWebhookRequestQuery.php
	@@ -0,0 +1,126 @@
	+<?php
	+
	+final class HeraldWebhookRequestQuery
	+ extends PhabricatorCursorPagedPolicyAwareQuery {
	+
	+ private $ids;
	+ private $phids;
	+ private $webhookPHIDs;
	+ private $lastRequestEpochMin;
	+ private $lastRequestEpochMax;
	+ private $lastRequestResults;
	+
	+ public function withIDs(array $ids) {
	+ $this->ids = $ids;
	+ return $this;
	+ }
	+
	+ public function withPHIDs(array $phids) {
	+ $this->phids = $phids;
	+ return $this;
	+ }
	+
	+ public function withWebhookPHIDs(array $phids) {
	+ $this->webhookPHIDs = $phids;
	+ return $this;
	+ }
	+
	+ public function newResultObject() {
	+ return new HeraldWebhookRequest();
	+ }
	+
	+ protected function loadPage() {
	+ return $this->loadStandardPage($this->newResultObject());
	+ }
	+
	+ public function withLastRequestEpochBetween($epoch_min, $epoch_max) {
	+ $this->lastRequestEpochMin = $epoch_min;
	+ $this->lastRequestEpochMax = $epoch_max;
	+ return $this;
	+ }
	+
	+ public function withLastRequestResults(array $results) {
	+ $this->lastRequestResults = $results;
	+ return $this;
	+ }
	+
	+ protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
	+ $where = parent::buildWhereClauseParts($conn);
	+
	+ if ($this->ids !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'id IN (%Ld)',
	+ $this->ids);
	+ }
	+
	+ if ($this->phids !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'phid IN (%Ls)',
	+ $this->phids);
	+ }
	+
	+ if ($this->webhookPHIDs !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'webhookPHID IN (%Ls)',
	+ $this->webhookPHIDs);
	+ }
	+
	+ if ($this->lastRequestEpochMin !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'lastRequestEpoch >= %d',
	+ $this->lastRequestEpochMin);
	+ }
	+
	+ if ($this->lastRequestEpochMax !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'lastRequestEpoch <= %d',
	+ $this->lastRequestEpochMax);
	+ }
	+
	+ if ($this->lastRequestResults !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'lastRequestResult IN (%Ls)',
	+ $this->lastRequestResults);
	+ }
	+
	+ return $where;
	+ }
	+
	+ protected function willFilterPage(array $requests) {
	+ $hook_phids = mpull($requests, 'getWebhookPHID');
	+
	+ $hooks = id(new HeraldWebhookQuery())
	+ ->setViewer($this->getViewer())
	+ ->setParentQuery($this)
	+ ->withPHIDs($hook_phids)
	+ ->execute();
	+ $hooks = mpull($hooks, null, 'getPHID');
	+
	+ foreach ($requests as $key => $request) {
	+ $hook_phid = $request->getWebhookPHID();
	+ $hook = idx($hooks, $hook_phid);
	+
	+ if (!$hook) {
	+ unset($requests[$key]);
	+ $this->didRejectResult($request);
	+ continue;
	+ }
	+
	+ $request->attachWebhook($hook);
	+ }
	+
	+ return $requests;
	+ }
	+
	+
	+ public function getQueryApplicationClass() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+}
	diff --git a/src/applications/herald/query/HeraldWebhookSearchEngine.php b/src/applications/herald/query/HeraldWebhookSearchEngine.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/query/HeraldWebhookSearchEngine.php
	@@ -0,0 +1,95 @@
	+<?php
	+
	+final class HeraldWebhookSearchEngine
	+ extends PhabricatorApplicationSearchEngine {
	+
	+ public function getResultTypeDescription() {
	+ return pht('Webhooks');
	+ }
	+
	+ public function getApplicationClassName() {
	+ return 'PhabricatorHeraldApplication';
	+ }
	+
	+ public function newQuery() {
	+ return new HeraldWebhookQuery();
	+ }
	+
	+ protected function buildQueryFromParameters(array $map) {
	+ $query = $this->newQuery();
	+
	+ if ($map['statuses']) {
	+ $query->withStatuses($map['statuses']);
	+ }
	+
	+ return $query;
	+ }
	+
	+ protected function buildCustomSearchFields() {
	+ return array(
	+ id(new PhabricatorSearchCheckboxesField())
	+ ->setKey('statuses')
	+ ->setLabel(pht('Status'))
	+ ->setDescription(
	+ pht('Search for archived or active pastes.'))
	+ ->setOptions(HeraldWebhook::getStatusDisplayNameMap()),
	+ );
	+ }
	+
	+ protected function getURI($path) {
	+ return '/herald/webhook/'.$path;
	+ }
	+
	+ protected function getBuiltinQueryNames() {
	+ $names = array();
	+
	+ $names['active'] = pht('Active');
	+ $names['all'] = pht('All');
	+
	+ return $names;
	+ }
	+
	+ public function buildSavedQueryFromBuiltin($query_key) {
	+ $query = $this->newSavedQuery();
	+ $query->setQueryKey($query_key);
	+
	+ switch ($query_key) {
	+ case 'all':
	+ return $query;
	+ case 'active':
	+ return $query->setParameter(
	+ 'statuses',
	+ array(
	+ HeraldWebhook::HOOKSTATUS_FIREHOSE,
	+ HeraldWebhook::HOOKSTATUS_ENABLED,
	+ ));
	+ }
	+
	+ return parent::buildSavedQueryFromBuiltin($query_key);
	+ }
	+
	+ protected function renderResultList(
	+ array $hooks,
	+ PhabricatorSavedQuery $query,
	+ array $handles) {
	+ assert_instances_of($hooks, 'HeraldWebhook');
	+
	+ $viewer = $this->requireViewer();
	+
	+ $list = id(new PHUIObjectItemListView())
	+ ->setViewer($viewer);
	+ foreach ($hooks as $hook) {
	+ $item = id(new PHUIObjectItemView())
	+ ->setObjectName(pht('Hook %d', $hook->getID()))
	+ ->setHeader($hook->getName())
	+ ->setHref($hook->getURI());
	+
	+ $list->addItem($item);
	+ }
	+
	+ return id(new PhabricatorApplicationSearchResultView())
	+ ->setObjectList($list)
	+ ->setNoDataString(pht('No webhooks found.'));
	+ }
	+
	+}
	diff --git a/src/applications/herald/query/HeraldWebhookTransactionQuery.php b/src/applications/herald/query/HeraldWebhookTransactionQuery.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/query/HeraldWebhookTransactionQuery.php
	@@ -0,0 +1,10 @@
	+<?php
	+
	+final class HeraldWebhookTransactionQuery
	+ extends PhabricatorApplicationTransactionQuery {
	+
	+ public function getTemplateApplicationTransaction() {
	+ return new HeraldWebhookTransaction();
	+ }
	+
	+}
	diff --git a/src/applications/herald/storage/HeraldWebhook.php b/src/applications/herald/storage/HeraldWebhook.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/storage/HeraldWebhook.php
	@@ -0,0 +1,177 @@
	+<?php
	+
	+final class HeraldWebhook
	+ extends HeraldDAO
	+ implements
	+ PhabricatorPolicyInterface,
	+ PhabricatorApplicationTransactionInterface,
	+ PhabricatorDestructibleInterface {
	+
	+ protected $name;
	+ protected $webhookURI;
	+ protected $viewPolicy;
	+ protected $editPolicy;
	+ protected $status;
	+ protected $hmacKey;
	+
	+ const HOOKSTATUS_FIREHOSE = 'firehose';
	+ const HOOKSTATUS_ENABLED = 'enabled';
	+ const HOOKSTATUS_DISABLED = 'disabled';
	+
	+ protected function getConfiguration() {
	+ return array(
	+ self::CONFIG_AUX_PHID => true,
	+ self::CONFIG_COLUMN_SCHEMA => array(
	+ 'name' => 'text128',
	+ 'webhookURI' => 'text255',
	+ 'status' => 'text32',
	+ 'hmacKey' => 'text32',
	+ ),
	+ self::CONFIG_KEY_SCHEMA => array(
	+ 'key_status' => array(
	+ 'columns' => array('status'),
	+ ),
	+ ),
	+ ) + parent::getConfiguration();
	+ }
	+
	+ public function getPHIDType() {
	+ return HeraldWebhookPHIDType::TYPECONST;
	+ }
	+
	+ public static function initializeNewWebhook(PhabricatorUser $viewer) {
	+ return id(new self())
	+ ->setStatus(self::HOOKSTATUS_ENABLED)
	+ ->setViewPolicy(PhabricatorPolicies::getMostOpenPolicy())
	+ ->setEditPolicy($viewer->getPHID())
	+ ->setHmacKey(Filesystem::readRandomCharacters(32));
	+ }
	+
	+ public function getURI() {
	+ return '/herald/webhook/view/'.$this->getID().'/';
	+ }
	+
	+ public function isDisabled() {
	+ return ($this->getStatus() === self::HOOKSTATUS_DISABLED);
	+ }
	+
	+ public static function getStatusDisplayNameMap() {
	+ return array(
	+ self::HOOKSTATUS_FIREHOSE => pht('Firehose'),
	+ self::HOOKSTATUS_ENABLED => pht('Enabled'),
	+ self::HOOKSTATUS_DISABLED => pht('Disabled'),
	+ );
	+ }
	+
	+ public function getStatusDisplayName() {
	+ $status = $this->getStatus();
	+ return idx($this->getStatusDisplayNameMap(), $status);
	+ }
	+
	+ public function getErrorBackoffWindow() {
	+ return phutil_units('5 minutes in seconds');
	+ }
	+
	+ public function getErrorBackoffThreshold() {
	+ return 10;
	+ }
	+
	+ public function isInErrorBackoff(PhabricatorUser $viewer) {
	+ $backoff_window = $this->getErrorBackoffWindow();
	+ $backoff_threshold = $this->getErrorBackoffThreshold();
	+
	+ $now = PhabricatorTime::getNow();
	+
	+ $window_start = ($now - $backoff_window);
	+
	+ $requests = id(new HeraldWebhookRequestQuery())
	+ ->setViewer($viewer)
	+ ->withWebhookPHIDs(array($this->getPHID()))
	+ ->withLastRequestEpochBetween($window_start, null)
	+ ->withLastRequestResults(
	+ array(
	+ HeraldWebhookRequest::RESULT_FAIL,
	+ ))
	+ ->execute();
	+
	+ if (count($requests) >= $backoff_threshold) {
	+ return true;
	+ }
	+
	+ return false;
	+ }
	+
	+
	+/* -( PhabricatorPolicyInterface )----------------------------------------- */
	+
	+
	+ public function getCapabilities() {
	+ return array(
	+ PhabricatorPolicyCapability::CAN_VIEW,
	+ PhabricatorPolicyCapability::CAN_EDIT,
	+ );
	+ }
	+
	+ public function getPolicy($capability) {
	+ switch ($capability) {
	+ case PhabricatorPolicyCapability::CAN_VIEW:
	+ return $this->getViewPolicy();
	+ case PhabricatorPolicyCapability::CAN_EDIT:
	+ return $this->getEditPolicy();
	+ }
	+ }
	+
	+ public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	+ return false;
	+ }
	+
	+
	+/* -( PhabricatorApplicationTransactionInterface )------------------------- */
	+
	+
	+ public function getApplicationTransactionEditor() {
	+ return new HeraldWebhookEditor();
	+ }
	+
	+ public function getApplicationTransactionObject() {
	+ return $this;
	+ }
	+
	+ public function getApplicationTransactionTemplate() {
	+ return new HeraldWebhookTransaction();
	+ }
	+
	+ public function willRenderTimeline(
	+ PhabricatorApplicationTransactionView $timeline,
	+ AphrontRequest $request) {
	+ return $timeline;
	+ }
	+
	+
	+/* -( PhabricatorDestructibleInterface )----------------------------------- */
	+
	+
	+ public function destroyObjectPermanently(
	+ PhabricatorDestructionEngine $engine) {
	+
	+ while (true) {
	+ $requests = id(new HeraldWebhookRequestQuery())
	+ ->setViewer($engine->getViewer())
	+ ->withWebhookPHIDs(array($this->getPHID()))
	+ ->setLimit(100)
	+ ->execute();
	+
	+ if (!$requests) {
	+ break;
	+ }
	+
	+ foreach ($requests as $request) {
	+ $request->delete();
	+ }
	+ }
	+
	+ $this->delete();
	+ }
	+
	+
	+}
	diff --git a/src/applications/herald/storage/HeraldWebhookRequest.php b/src/applications/herald/storage/HeraldWebhookRequest.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/storage/HeraldWebhookRequest.php
	@@ -0,0 +1,191 @@
	+<?php
	+
	+final class HeraldWebhookRequest
	+ extends HeraldDAO
	+ implements
	+ PhabricatorPolicyInterface,
	+ PhabricatorExtendedPolicyInterface {
	+
	+ protected $webhookPHID;
	+ protected $objectPHID;
	+ protected $status;
	+ protected $properties = array();
	+ protected $lastRequestResult;
	+ protected $lastRequestEpoch;
	+
	+ private $webhook = self::ATTACHABLE;
	+
	+ const RETRY_NEVER = 'never';
	+ const RETRY_FOREVER = 'forever';
	+
	+ const STATUS_QUEUED = 'queued';
	+ const STATUS_FAILED = 'failed';
	+ const STATUS_SENT = 'sent';
	+
	+ const RESULT_NONE = 'none';
	+ const RESULT_OKAY = 'okay';
	+ const RESULT_FAIL = 'fail';
	+
	+ protected function getConfiguration() {
	+ return array(
	+ self::CONFIG_AUX_PHID => true,
	+ self::CONFIG_SERIALIZATION => array(
	+ 'properties' => self::SERIALIZATION_JSON,
	+ ),
	+ self::CONFIG_COLUMN_SCHEMA => array(
	+ 'status' => 'text32',
	+ 'lastRequestResult' => 'text32',
	+ 'lastRequestEpoch' => 'epoch',
	+ ),
	+ self::CONFIG_KEY_SCHEMA => array(
	+ 'key_ratelimit' => array(
	+ 'columns' => array(
	+ 'webhookPHID',
	+ 'lastRequestResult',
	+ 'lastRequestEpoch',
	+ ),
	+ ),
	+ 'key_collect' => array(
	+ 'columns' => array('dateCreated'),
	+ ),
	+ ),
	+ ) + parent::getConfiguration();
	+ }
	+
	+ public function getPHIDType() {
	+ return HeraldWebhookRequestPHIDType::TYPECONST;
	+ }
	+
	+ public static function initializeNewWebhookRequest(HeraldWebhook $hook) {
	+ return id(new self())
	+ ->setWebhookPHID($hook->getPHID())
	+ ->attachWebhook($hook)
	+ ->setStatus(self::STATUS_QUEUED)
	+ ->setRetryMode(self::RETRY_NEVER)
	+ ->setLastRequestResult(self::RESULT_NONE)
	+ ->setLastRequestEpoch(0);
	+ }
	+
	+ public function getWebhook() {
	+ return $this->assertAttached($this->webhook);
	+ }
	+
	+ public function attachWebhook(HeraldWebhook $hook) {
	+ $this->webhook = $hook;
	+ return $this;
	+ }
	+
	+ protected function setProperty($key, $value) {
	+ $this->properties[$key] = $value;
	+ return $this;
	+ }
	+
	+ protected function getProperty($key, $default = null) {
	+ return idx($this->properties, $key, $default);
	+ }
	+
	+ public function setRetryMode($mode) {
	+ return $this->setProperty('retry', $mode);
	+ }
	+
	+ public function getRetryMode() {
	+ return $this->getProperty('retry');
	+ }
	+
	+ public function setErrorType($error_type) {
	+ return $this->setProperty('errorType', $error_type);
	+ }
	+
	+ public function getErrorType() {
	+ return $this->getProperty('errorType');
	+ }
	+
	+ public function setErrorCode($error_code) {
	+ return $this->setProperty('errorCode', $error_code);
	+ }
	+
	+ public function getErrorCode() {
	+ return $this->getProperty('errorCode');
	+ }
	+
	+ public function setTransactionPHIDs(array $phids) {
	+ return $this->setProperty('transactionPHIDs', $phids);
	+ }
	+
	+ public function getTransactionPHIDs() {
	+ return $this->getProperty('transactionPHIDs', array());
	+ }
	+
	+ public function queueCall() {
	+ PhabricatorWorker::scheduleTask(
	+ 'HeraldWebhookWorker',
	+ array(
	+ 'webhookRequestPHID' => $this->getPHID(),
	+ ),
	+ array(
	+ 'objectPHID' => $this->getPHID(),
	+ ));
	+
	+ return $this;
	+ }
	+
	+ public function newStatusIcon() {
	+ switch ($this->getStatus()) {
	+ case self::STATUS_QUEUED:
	+ $icon = 'fa-refresh';
	+ $color = 'blue';
	+ $tooltip = pht('Queued');
	+ break;
	+ case self::STATUS_SENT:
	+ $icon = 'fa-check';
	+ $color = 'green';
	+ $tooltip = pht('Sent');
	+ break;
	+ case self::STATUS_FAILED:
	+ default:
	+ $icon = 'fa-times';
	+ $color = 'red';
	+ $tooltip = pht('Failed');
	+ break;
	+
	+ }
	+
	+ return id(new PHUIIconView())
	+ ->setIcon($icon, $color)
	+ ->setTooltip($tooltip);
	+ }
	+
	+
	+/* -( PhabricatorPolicyInterface )----------------------------------------- */
	+
	+
	+ public function getCapabilities() {
	+ return array(
	+ PhabricatorPolicyCapability::CAN_VIEW,
	+ );
	+ }
	+
	+ public function getPolicy($capability) {
	+ switch ($capability) {
	+ case PhabricatorPolicyCapability::CAN_VIEW:
	+ return PhabricatorPolicies::getMostOpenPolicy();
	+ }
	+ }
	+
	+ public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	+ return false;
	+ }
	+
	+
	+/* -( PhabricatorExtendedPolicyInterface )--------------------------------- */
	+
	+
	+ public function getExtendedPolicy($capability, PhabricatorUser $viewer) {
	+ return array(
	+ array($this->getWebhook(), PhabricatorPolicyCapability::CAN_VIEW),
	+ );
	+ }
	+
	+
	+
	+}
	diff --git a/src/applications/herald/storage/HeraldWebhookTransaction.php b/src/applications/herald/storage/HeraldWebhookTransaction.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/storage/HeraldWebhookTransaction.php
	@@ -0,0 +1,22 @@
	+<?php
	+
	+final class HeraldWebhookTransaction
	+ extends PhabricatorModularTransaction {
	+
	+ public function getApplicationName() {
	+ return 'herald';
	+ }
	+
	+ public function getApplicationTransactionType() {
	+ return HeraldWebhookPHIDType::TYPECONST;
	+ }
	+
	+ public function getApplicationTransactionCommentObject() {
	+ return null;
	+ }
	+
	+ public function getBaseTransactionClass() {
	+ return 'HeraldWebhookTransactionType';
	+ }
	+
	+}
	diff --git a/src/applications/herald/view/HeraldWebhookRequestListView.php b/src/applications/herald/view/HeraldWebhookRequestListView.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/view/HeraldWebhookRequestListView.php
	@@ -0,0 +1,78 @@
	+<?php
	+
	+final class HeraldWebhookRequestListView
	+ extends AphrontView {
	+
	+ private $requests;
	+ private $highlightID;
	+
	+ public function setRequests(array $requests) {
	+ assert_instances_of($requests, 'HeraldWebhookRequest');
	+ $this->requests = $requests;
	+ return $this;
	+ }
	+
	+ public function setHighlightID($highlight_id) {
	+ $this->highlightID = $highlight_id;
	+ return $this;
	+ }
	+
	+ public function getHighlightID() {
	+ return $this->highlightID;
	+ }
	+
	+ public function render() {
	+ $viewer = $this->getViewer();
	+ $requests = $this->requests;
	+
	+ $handle_phids = array();
	+ foreach ($requests as $request) {
	+ $handle_phids[] = $request->getObjectPHID();
	+ }
	+ $handles = $viewer->loadHandles($handle_phids);
	+
	+ $highlight_id = $this->getHighlightID();
	+
	+ $rows = array();
	+ $rowc = array();
	+ foreach ($requests as $request) {
	+ $icon = $request->newStatusIcon();
	+
	+ if ($highlight_id == $request->getID()) {
	+ $rowc[] = 'highlighted';
	+ } else {
	+ $rowc[] = null;
	+ }
	+
	+ $rows[] = array(
	+ $request->getID(),
	+ $icon,
	+ $handles[$request->getObjectPHID()]->renderLink(),
	+ $request->getErrorType(),
	+ $request->getErrorCode(),
	+ );
	+ }
	+
	+ $table = id(new AphrontTableView($rows))
	+ ->setRowClasses($rowc)
	+ ->setHeaders(
	+ array(
	+ pht('ID'),
	+ '',
	+ pht('Object'),
	+ pht('Type'),
	+ pht('Code'),
	+ ))
	+ ->setColumnClasses(
	+ array(
	+ 'n',
	+ '',
	+ 'wide',
	+ '',
	+ '',
	+ ));
	+
	+ return $table;
	+ }
	+
	+}
	diff --git a/src/applications/herald/worker/HeraldWebhookWorker.php b/src/applications/herald/worker/HeraldWebhookWorker.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/worker/HeraldWebhookWorker.php
	@@ -0,0 +1,229 @@
	+<?php
	+
	+final class HeraldWebhookWorker
	+ extends PhabricatorWorker {
	+
	+ protected function doWork() {
	+ $viewer = PhabricatorUser::getOmnipotentUser();
	+
	+ $data = $this->getTaskData();
	+ $request_phid = idx($data, 'webhookRequestPHID');
	+
	+ $request = id(new HeraldWebhookRequestQuery())
	+ ->setViewer($viewer)
	+ ->withPHIDs(array($request_phid))
	+ ->executeOne();
	+ if (!$request) {
	+ throw new PhabricatorWorkerPermanentFailureException(
	+ pht(
	+ 'Unable to load webhook request ("%s"). It may have been '.
	+ 'garbage collected.',
	+ $request_phid));
	+ }
	+
	+ $status = $request->getStatus();
	+ if ($status !== HeraldWebhookRequest::STATUS_QUEUED) {
	+ throw new PhabricatorWorkerPermanentFailureException(
	+ pht(
	+ 'Webhook request ("%s") is not in "%s" status (actual '.
	+ 'status is "%s"). Declining call to hook.',
	+ $request_phid,
	+ HeraldWebhookRequest::STATUS_QUEUED,
	+ $status));
	+ }
	+
	+ $hook = $request->getWebhook();
	+
	+ if ($hook->isDisabled()) {
	+ $this->failRequest($request, 'hook', 'disabled');
	+ throw new PhabricatorWorkerPermanentFailureException(
	+ pht(
	+ 'Associated hook ("%s") for webhook request ("%s") is disabled.',
	+ $hook->getPHID(),
	+ $request_phid));
	+ }
	+
	+ $uri = $hook->getWebhookURI();
	+ try {
	+ PhabricatorEnv::requireValidRemoteURIForFetch(
	+ $uri,
	+ array(
	+ 'http',
	+ 'https',
	+ ));
	+ } catch (Exception $ex) {
	+ $this->failRequest($request, 'hook', 'uri');
	+ throw new PhabricatorWorkerPermanentFailureException(
	+ pht(
	+ 'Associated hook ("%s") for webhook request ("%s") has invalid '.
	+ 'fetch URI: %s',
	+ $hook->getPHID(),
	+ $request_phid,
	+ $ex->getMessage()));
	+ }
	+
	+ $object_phid = $request->getObjectPHID();
	+
	+ $object = id(new PhabricatorObjectQuery())
	+ ->setViewer($viewer)
	+ ->withPHIDs(array($object_phid))
	+ ->executeOne();
	+ if (!$object) {
	+ $this->failRequest($request, 'hook', 'object');
	+ throw new PhabricatorWorkerPermanentFailureException(
	+ pht(
	+ 'Unable to load object ("%s") for webhook request ("%s").',
	+ $object_phid,
	+ $request_phid));
	+ }
	+
	+ $xaction_query = PhabricatorApplicationTransactionQuery::newQueryForObject(
	+ $object);
	+ $xaction_phids = $request->getTransactionPHIDs();
	+ if ($xaction_phids) {
	+ $xactions = $xaction_query
	+ ->setViewer($viewer)
	+ ->withObjectPHIDs(array($object_phid))
	+ ->withPHIDs($xaction_phids)
	+ ->execute();
	+ $xactions = mpull($xactions, null, 'getPHID');
	+ } else {
	+ $xactions = array();
	+ }
	+
	+ // To prevent thundering herd issues for high volume webhooks (where
	+ // a large number of workers might try to work through a request backlog
	+ // simultaneously, before the error backoff can catch up), we never
	+ // parallelize requests to a particular webhook.
	+
	+ $lock_key = 'webhook('.$hook->getPHID().')';
	+ $lock = PhabricatorGlobalLock::newLock($lock_key);
	+
	+ try {
	+ $lock->lock();
	+ } catch (Exception $ex) {
	+ phlog($ex);
	+ throw new PhabricatorWorkerYieldException(15);
	+ }
	+
	+ $caught = null;
	+ try {
	+ $this->callWebhookWithLock($hook, $request, $object, $xactions);
	+ } catch (Exception $ex) {
	+ $caught = $ex;
	+ }
	+
	+ $lock->unlock();
	+
	+ if ($caught) {
	+ throw $caught;
	+ }
	+ }
	+
	+ private function callWebhookWithLock(
	+ HeraldWebhook $hook,
	+ HeraldWebhookRequest $request,
	+ $object,
	+ array $xactions) {
	+ $viewer = PhabricatorUser::getOmnipotentUser();
	+
	+ if ($hook->isInErrorBackoff($viewer)) {
	+ throw new PhabricatorWorkerYieldException($hook->getErrorBackoffWindow());
	+ }
	+
	+ $xaction_data = array();
	+ foreach ($xactions as $xaction) {
	+ $xaction_data[] = array(
	+ 'phid' => $xaction->getPHID(),
	+ );
	+ }
	+
	+ $payload = array(
	+ 'triggers' => array(),
	+ 'object' => array(
	+ 'phid' => $object->getPHID(),
	+ ),
	+ 'transactions' => $xaction_data,
	+ );
	+
	+ $payload = phutil_json_encode($payload);
	+ $key = $hook->getHmacKey();
	+ $signature = PhabricatorHash::digestHMACSHA256($payload, $key);
	+ $uri = $hook->getWebhookURI();
	+
	+ $future = id(new HTTPSFuture($uri))
	+ ->setMethod('POST')
	+ ->addHeader('Content-Type', 'application/json')
	+ ->addHeader('X-Phabricator-Webhook-Signature', $signature)
	+ ->setTimeout(15)
	+ ->setData($payload);
	+
	+ list($status) = $future->resolve();
	+
	+ if ($status->isTimeout()) {
	+ $error_type = 'timeout';
	+ } else {
	+ $error_type = 'http';
	+ }
	+ $error_code = $status->getStatusCode();
	+
	+ $request
	+ ->setErrorType($error_type)
	+ ->setErrorCode($error_code)
	+ ->setLastRequestEpoch(PhabricatorTime::getNow());
	+
	+ $retry_forever = HeraldWebhookRequest::RETRY_FOREVER;
	+ if ($status->isTimeout() \|\| $status->isError()) {
	+ $should_retry = ($request->getRetryMode() === $retry_forever);
	+
	+ $request
	+ ->setLastRequestResult(HeraldWebhookRequest::RESULT_FAIL);
	+
	+ if ($should_retry) {
	+ $request->save();
	+
	+ throw new Exception(
	+ pht(
	+ 'Webhook request ("%s", to "%s") failed (%s / %s). The request '.
	+ 'will be retried.',
	+ $request->getPHID(),
	+ $uri,
	+ $error_type,
	+ $error_code));
	+ } else {
	+ $request
	+ ->setStatus(HeraldWebhookRequest::STATUS_FAILED)
	+ ->save();
	+
	+ throw new PhabricatorWorkerPermanentFailureException(
	+ pht(
	+ 'Webhook request ("%s", to "%s") failed (%s / %s). The request '.
	+ 'will not be retried.',
	+ $request->getPHID(),
	+ $uri,
	+ $error_type,
	+ $error_code));
	+ }
	+ } else {
	+ $request
	+ ->setLastRequestResult(HeraldWebhookRequest::RESULT_OKAY)
	+ ->setStatus(HeraldWebhookRequest::STATUS_SENT)
	+ ->save();
	+ }
	+ }
	+
	+ private function failRequest(
	+ HeraldWebhookRequest $request,
	+ $error_type,
	+ $error_code) {
	+
	+ $request
	+ ->setStatus(HeraldWebhookRequest::STATUS_FAILED)
	+ ->setErrorType($error_type)
	+ ->setErrorCode($error_code)
	+ ->setLastRequestResult(HeraldWebhookRequest::RESULT_NONE)
	+ ->setLastRequestEpoch(0)
	+ ->save();
	+ }
	+
	+}
	diff --git a/src/applications/herald/xaction/HeraldWebhookNameTransaction.php b/src/applications/herald/xaction/HeraldWebhookNameTransaction.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/xaction/HeraldWebhookNameTransaction.php
	@@ -0,0 +1,60 @@
	+<?php
	+
	+final class HeraldWebhookNameTransaction
	+ extends HeraldWebhookTransactionType {
	+
	+ const TRANSACTIONTYPE = 'name';
	+
	+ public function generateOldValue($object) {
	+ return $object->getName();
	+ }
	+
	+ public function applyInternalEffects($object, $value) {
	+ $object->setName($value);
	+ }
	+
	+ public function getTitle() {
	+ return pht(
	+ '%s renamed this webhook from %s to %s.',
	+ $this->renderAuthor(),
	+ $this->renderOldValue(),
	+ $this->renderNewValue());
	+ }
	+
	+ public function getTitleForFeed() {
	+ return pht(
	+ '%s renamed %s from %s to %s.',
	+ $this->renderAuthor(),
	+ $this->renderObject(),
	+ $this->renderOldValue(),
	+ $this->renderNewValue());
	+ }
	+
	+ public function validateTransactions($object, array $xactions) {
	+ $errors = array();
	+ $viewer = $this->getActor();
	+
	+ if ($this->isEmptyTextTransaction($object->getName(), $xactions)) {
	+ $errors[] = $this->newRequiredError(
	+ pht('Webhooks must have a name.'));
	+ return $errors;
	+ }
	+
	+ $max_length = $object->getColumnMaximumByteLength('name');
	+ foreach ($xactions as $xaction) {
	+ $old_value = $this->generateOldValue($object);
	+ $new_value = $xaction->getNewValue();
	+
	+ $new_length = strlen($new_value);
	+ if ($new_length > $max_length) {
	+ $errors[] = $this->newInvalidError(
	+ pht(
	+ 'Webhook names can be no longer than %s characters.',
	+ new PhutilNumber($max_length)));
	+ }
	+ }
	+
	+ return $errors;
	+ }
	+
	+}
	diff --git a/src/applications/herald/xaction/HeraldWebhookStatusTransaction.php b/src/applications/herald/xaction/HeraldWebhookStatusTransaction.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/xaction/HeraldWebhookStatusTransaction.php
	@@ -0,0 +1,55 @@
	+<?php
	+
	+final class HeraldWebhookStatusTransaction
	+ extends HeraldWebhookTransactionType {
	+
	+ const TRANSACTIONTYPE = 'status';
	+
	+ public function generateOldValue($object) {
	+ return $object->getStatus();
	+ }
	+
	+ public function applyInternalEffects($object, $value) {
	+ $object->setStatus($value);
	+ }
	+
	+ public function getTitle() {
	+ return pht(
	+ '%s changed hook status from %s to %s.',
	+ $this->renderAuthor(),
	+ $this->renderOldValue(),
	+ $this->renderNewValue());
	+ }
	+
	+ public function getTitleForFeed() {
	+ return pht(
	+ '%s changed %s from %s to %s.',
	+ $this->renderAuthor(),
	+ $this->renderObject(),
	+ $this->renderOldValue(),
	+ $this->renderNewValue());
	+ }
	+
	+ public function validateTransactions($object, array $xactions) {
	+ $errors = array();
	+ $viewer = $this->getActor();
	+
	+ $options = HeraldWebhook::getStatusDisplayNameMap();
	+
	+ foreach ($xactions as $xaction) {
	+ $new_value = $xaction->getNewValue();
	+
	+ if (!isset($options[$new_value])) {
	+ $errors[] = $this->newInvalidError(
	+ pht(
	+ 'Webhook status "%s" is not valid. Valid statuses are: %s.',
	+ $new_value,
	+ implode(', ', array_keys($options))),
	+ $xaction);
	+ }
	+ }
	+
	+ return $errors;
	+ }
	+
	+}
	diff --git a/src/applications/herald/xaction/HeraldWebhookTransactionType.php b/src/applications/herald/xaction/HeraldWebhookTransactionType.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/xaction/HeraldWebhookTransactionType.php
	@@ -0,0 +1,4 @@
	+<?php
	+
	+abstract class HeraldWebhookTransactionType
	+ extends PhabricatorModularTransactionType {}
	diff --git a/src/applications/herald/xaction/HeraldWebhookURITransaction.php b/src/applications/herald/xaction/HeraldWebhookURITransaction.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/herald/xaction/HeraldWebhookURITransaction.php
	@@ -0,0 +1,74 @@
	+<?php
	+
	+final class HeraldWebhookURITransaction
	+ extends HeraldWebhookTransactionType {
	+
	+ const TRANSACTIONTYPE = 'uri';
	+
	+ public function generateOldValue($object) {
	+ return $object->getWebhookURI();
	+ }
	+
	+ public function applyInternalEffects($object, $value) {
	+ $object->setWebhookURI($value);
	+ }
	+
	+ public function getTitle() {
	+ return pht(
	+ '%s changed the URI for this webhook from %s to %s.',
	+ $this->renderAuthor(),
	+ $this->renderOldValue(),
	+ $this->renderNewValue());
	+ }
	+
	+ public function getTitleForFeed() {
	+ return pht(
	+ '%s changed the URI for %s from %s to %s.',
	+ $this->renderAuthor(),
	+ $this->renderObject(),
	+ $this->renderOldValue(),
	+ $this->renderNewValue());
	+ }
	+
	+ public function validateTransactions($object, array $xactions) {
	+ $errors = array();
	+ $viewer = $this->getActor();
	+
	+ if ($this->isEmptyTextTransaction($object->getName(), $xactions)) {
	+ $errors[] = $this->newRequiredError(
	+ pht('Webhooks must have a URI.'));
	+ return $errors;
	+ }
	+
	+ $max_length = $object->getColumnMaximumByteLength('webhookURI');
	+ foreach ($xactions as $xaction) {
	+ $old_value = $this->generateOldValue($object);
	+ $new_value = $xaction->getNewValue();
	+
	+ $new_length = strlen($new_value);
	+ if ($new_length > $max_length) {
	+ $errors[] = $this->newInvalidError(
	+ pht(
	+ 'Webhook URIs can be no longer than %s characters.',
	+ new PhutilNumber($max_length)),
	+ $xaction);
	+ }
	+
	+ try {
	+ PhabricatorEnv::requireValidRemoteURIForFetch(
	+ $new_value,
	+ array(
	+ 'http',
	+ 'https',
	+ ));
	+ } catch (Exception $ex) {
	+ $errors[] = $this->newInvalidError(
	+ $ex->getMessage(),
	+ $xaction);
	+ }
	+ }
	+
	+ return $errors;
	+ }
	+
	+}

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