Don't present users with Herald fields/actions for uninstalled applications, unless the rule already uses them

Summary:
Fixes T7961. Currently, we present Herald users with actions like "Require legalpad signatures" and "Run build plans" even if Legalpad and Harbormaster are not installed.

Instead, allow fields and actions to be made "unavailable", which means that we won't present them as options when adding to new or existing rules.

If you edit a rule which already uses one of these fields or actions, it isn't affected.

Test Plan:
  - Created a rule with a legalpad action, uninstalled legalpad, edited the rule. Action remained untouched.
  - Created a new rule, wasn't offered the legalpad action.
  - Reinstalled the application, saw the action again.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T7961

Differential Revision: https://secure.phabricator.com/D20808

resources/celerity/map.php

@@ -397,7 +397,7 @@ return array(
     'rsrc/js/application/files/behavior-icon-composer.js' => '38a6cedb',
     'rsrc/js/application/files/behavior-launch-icon-composer.js' => 'a17b84f1',
     'rsrc/js/application/harbormaster/behavior-harbormaster-log.js' => 'b347a301',
-    'rsrc/js/application/herald/HeraldRuleEditor.js' => '27daef73',
+    'rsrc/js/application/herald/HeraldRuleEditor.js' => '2633bef7',
     'rsrc/js/application/herald/PathTypeahead.js' => 'ad486db3',
     'rsrc/js/application/herald/herald-rule-editor.js' => '0922e81d',
     'rsrc/js/application/maniphest/behavior-batch-selector.js' => '139ef688',
@@ -571,7 +571,7 @@ return array(
     'global-drag-and-drop-css' => '1d2713a4',
     'harbormaster-css' => '8dfe16b2',
     'herald-css' => '648d39e2',
-    'herald-rule-editor' => '27daef73',
+    'herald-rule-editor' => '2633bef7',
     'herald-test-css' => 'e004176f',
     'inline-comment-summary-css' => '81eb368d',
     'javelin-aphlict' => '022516b4',
@@ -1117,7 +1117,7 @@ return array(
       'javelin-json',
       'phabricator-draggable-list',
     ),
-    '27daef73' => array(
+    '2633bef7' => array(
       'multirow-row-manager',
       'javelin-install',
       'javelin-util',

src/applications/harbormaster/herald/HarbormasterRunBuildPlansHeraldAction.php

@@ -96,4 +96,8 @@ final class HarbormasterRunBuildPlansHeraldAction
     return $record->getTarget();
   }
 
+  public function isActionAvailable() {
+    return id(new PhabricatorHarbormasterApplication())->isInstalled();
+  }
+
 }

src/applications/herald/action/HeraldAction.php

@@ -405,4 +405,8 @@ abstract class HeraldAction extends Phobject {
     return array();
   }
 
+  public function isActionAvailable() {
+    return true;
+  }
+
 }

src/applications/herald/adapter/HeraldAdapter.php

@@ -373,6 +373,16 @@ abstract class HeraldAdapter extends Phobject {
     return $field->getFieldGroupKey();
   }
 
+  public function isFieldAvailable($field_key) {
+    $field = $this->getFieldImplementation($field_key);
+
+    if (!$field) {
+      return null;
+    }
+
+    return $field->isFieldAvailable();
+  }
+
 
 /* -(  Conditions  )--------------------------------------------------------- */
 
@@ -765,6 +775,16 @@ abstract class HeraldAdapter extends Phobject {
     return $action->getActionGroupKey();
   }
 
+  public function isActionAvailable($action_key) {
+    $action = $this->getActionImplementation($action_key);
+
+    if (!$action) {
+      return null;
+    }
+
+    return $action->isActionAvailable();
+  }
+
   public function getActions($rule_type) {
     $actions = array();
     foreach ($this->getActionsForRuleType($rule_type) as $key => $action) {

src/applications/herald/controller/HeraldRuleController.php

@@ -684,7 +684,10 @@ final class HeraldRuleController extends HeraldController {
     $group_map = array();
     foreach ($field_map as $field_key => $field_name) {
       $group_key = $adapter->getFieldGroupKey($field_key);
-      $group_map[$group_key][$field_key] = $field_name;
+      $group_map[$group_key][$field_key] = array(
+        'name' => $field_name,
+        'available' => $adapter->isFieldAvailable($field_key),
+      );
     }
 
     return $this->getGroups(
@@ -696,7 +699,10 @@ final class HeraldRuleController extends HeraldController {
     $group_map = array();
     foreach ($action_map as $action_key => $action_name) {
       $group_key = $adapter->getActionGroupKey($action_key);
-      $group_map[$group_key][$action_key] = $action_name;
+      $group_map[$group_key][$action_key] = array(
+        'name' => $action_name,
+        'available' => $adapter->isActionAvailable($action_key),
+      );
     }
 
     return $this->getGroups(

src/applications/herald/field/HeraldField.php

@@ -241,4 +241,8 @@ abstract class HeraldField extends Phobject {
     return false;
   }
 
+  public function isFieldAvailable() {
+    return true;
+  }
+
 }

src/applications/legalpad/herald/LegalpadRequireSignatureHeraldAction.php

@@ -130,4 +130,9 @@ final class LegalpadRequireSignatureHeraldAction
       'Require document signatures: %s.',
       $this->renderHandleList($value));
   }
+
+  public function isActionAvailable() {
+    return id(new PhabricatorLegalpadApplication())->isInstalled();
+  }
+
 }

webroot/rsrc/js/application/herald/HeraldRuleEditor.js

@@ -350,8 +350,10 @@ JX.install('HeraldRuleEditor', {
         sigil: 'field-select'
       };
 
-      var field_select = this._renderGroupSelect(groups, attrs);
-      field_select.value = this._config.conditions[row_id][0];
+      var field_select = this._renderGroupSelect(
+        groups,
+        attrs,
+        this._config.conditions[row_id][0]);
 
       var field_cell = JX.$N('td', {sigil: 'field-cell'}, field_select);
 
@@ -367,18 +369,38 @@ JX.install('HeraldRuleEditor', {
       }
     },
 
-    _renderGroupSelect: function(groups, attrs) {
+    _renderGroupSelect: function(groups, attrs, value) {
       var optgroups = [];
       for (var ii = 0; ii < groups.length; ii++) {
         var group = groups[ii];
         var options = [];
         for (var k in group.options) {
-          options.push(JX.$N('option', {value: k}, group.options[k]));
+          var option = group.options[k];
+
+          var name = option.name;
+          var available = option.available;
+
+          // See T7961. If the option is not marked as "available", we only
+          // include it in the dropdown if the dropdown already has it as a
+          // value. We want to hide options provided by applications which are
+          // not installed, but do not want to break existing rules.
+
+          if (available || (k === value)) {
+            options.push(JX.$N('option', {value: k}, name));
+          }
+        }
+        if (options.length) {
+          optgroups.push(JX.$N('optgroup', {label: group.label}, options));
         }
-        optgroups.push(JX.$N('optgroup', {label: group.label}, options));
       }
 
-      return JX.$N('select', attrs, optgroups);
+      var select = JX.$N('select', attrs, optgroups);
+
+      if (value !== undefined) {
+        select.value = value;
+      }
+
+      return select;
     },
 
     _newAction : function(data) {
@@ -402,8 +424,10 @@ JX.install('HeraldRuleEditor', {
         sigil: 'action-select'
       };
 
-      var action_select = this._renderGroupSelect(groups, attrs);
-      action_select.value = action[0];
+      var action_select = this._renderGroupSelect(
+        groups,
+        attrs,
+        action[0]);
 
       var action_cell = JX.$N('td', {sigil: 'action-cell'}, action_select);