Conditionally show widget header actions

@@ -54,6 +54,17 @@
       <tb-material-icon-select
         formControlName="icon">
       </tb-material-icon-select>
+      <mat-checkbox *ngIf="displayShowWidgetActionForm()" formControlName="useShowWidgetActionFunction" style="padding-bottom: 16px;">
+        {{ 'widget-config.use-show-widget-action-function' | translate }}
+      </mat-checkbox>
+      <tb-js-func *ngIf="displayShowWidgetActionForm() && widgetActionFormGroup.get('useShowWidgetActionFunction').value"
+        formControlName="showWidgetActionFunction"
+        [functionArgs]="['widgetContext', 'data']"
+        [globalVariables]="functionScopeVariables"
+        [validationArgs]="[]"
+        [resultType]="'boolean'"
+        [editorCompleter]="customActionEditorCompleter"
+      ></tb-js-func>
       <mat-form-field class="mat-block">
         <mat-label translate>widget-config.action-type</mat-label>
         <mat-select required formControlName="type">

@@ -38,7 +38,12 @@ import {
   WidgetActionsData
 } from '@home/components/widget/action/manage-widget-actions.component.models';
 import { UtilsService } from '@core/services/utils.service';
-import { WidgetActionSource, WidgetActionType, widgetActionTypeTranslationMap } from '@shared/models/widget.models';
+import {
+  WidgetActionSource,
+  widgetActionSources,
+  WidgetActionType,
+  widgetActionTypeTranslationMap
+} from '@shared/models/widget.models';
 import { map, mergeMap, startWith, tap } from 'rxjs/operators';
 import { DashboardService } from '@core/http/dashboard.service';
 import { Dashboard } from '@shared/models/dashboard.models';
@@ -124,17 +129,41 @@ export class WidgetActionDialogComponent extends DialogComponent<WidgetActionDia
       this.fb.control(this.action.name, [this.validateActionName(), Validators.required]));
     this.widgetActionFormGroup.addControl('icon',
       this.fb.control(this.action.icon, [Validators.required]));
+    this.widgetActionFormGroup.addControl('useShowWidgetActionFunction',
+      this.fb.control(this.action.useShowWidgetActionFunction, []));
+    this.widgetActionFormGroup.addControl('showWidgetActionFunction',
+      this.fb.control(this.action.showWidgetActionFunction || 'return true;', []));
     this.widgetActionFormGroup.addControl('type',
       this.fb.control(this.action.type, [Validators.required]));
+    this.updateShowWidgetActionForm();
     this.updateActionTypeFormGroup(this.action.type, this.action);
     this.widgetActionFormGroup.get('type').valueChanges.subscribe((type: WidgetActionType) => {
       this.updateActionTypeFormGroup(type);
     });
     this.widgetActionFormGroup.get('actionSourceId').valueChanges.subscribe(() => {
       this.widgetActionFormGroup.get('name').updateValueAndValidity();
+      this.updateShowWidgetActionForm();
+    });
+    this.widgetActionFormGroup.get('useShowWidgetActionFunction').valueChanges.subscribe(() => {
+      this.updateShowWidgetActionForm();
     });
   }
 
+  displayShowWidgetActionForm(): boolean {
+    return this.widgetActionFormGroup.get('actionSourceId').value === widgetActionSources.headerButton.value;
+  }
+
+  private updateShowWidgetActionForm() {
+    const actionSourceId = this.widgetActionFormGroup.get('actionSourceId').value;
+    const useShowWidgetActionFunction = this.widgetActionFormGroup.get('useShowWidgetActionFunction').value;
+    if (actionSourceId === widgetActionSources.headerButton.value && useShowWidgetActionFunction) {
+      this.widgetActionFormGroup.get('showWidgetActionFunction').setValidators([Validators.required]);
+    } else {
+      this.widgetActionFormGroup.get('showWidgetActionFunction').clearValidators();
+    }
+    this.widgetActionFormGroup.get('showWidgetActionFunction').updateValueAndValidity();
+  }
+
   private updateActionTypeFormGroup(type?: WidgetActionType, action?: WidgetActionDescriptorInfo) {
     this.actionTypeFormGroup = this.fb.group({});
     if (type) {

@@ -330,7 +330,7 @@ export function parseData(input: DatasourceData[]): FormattedData[] {
         deviceType: null
       };
       entityArray.filter(el => el.data.length).forEach(el => {
-        const indexDate = el.data.length ? el.data.length - 1 : 0;
+        const indexDate = el.data.length - 1;
         if (!obj.hasOwnProperty(el.dataKey.label) || el.data[indexDate][1] !== '') {
           obj[el.dataKey.label] = el.data[indexDate][1];
           obj[el.dataKey.label + '|ts'] = el.data[indexDate][0];

@@ -55,9 +55,17 @@ import { AppState } from '@core/core.state';
 import { WidgetService } from '@core/http/widget.service';
 import { UtilsService } from '@core/services/utils.service';
 import { forkJoin, Observable, of, ReplaySubject, Subscription, throwError } from 'rxjs';
-import { deepClone, insertVariable, isDefined, objToBase64, objToBase64URI, validateEntityId } from '@core/utils';
 import {
-  IDynamicWidgetComponent,
+  deepClone,
+  insertVariable,
+  isDefined,
+  isNotEmptyStr,
+  objToBase64,
+  objToBase64URI,
+  validateEntityId
+} from '@core/utils';
+import {
+  IDynamicWidgetComponent, ShowWidgetHeaderActionFunction,
   WidgetContext,
   WidgetHeaderAction,
   WidgetInfo,
@@ -290,12 +298,25 @@ export class WidgetComponent extends PageComponent implements OnInit, AfterViewI
 
     this.widgetContext.customHeaderActions = [];
     const headerActionsDescriptors = this.getActionDescriptors(widgetActionSources.headerButton.value);
-    headerActionsDescriptors.forEach((descriptor) => {
+    headerActionsDescriptors.forEach((descriptor) =>
+    {
+      let useShowWidgetHeaderActionFunction = descriptor.useShowWidgetActionFunction || false;
+      let showWidgetHeaderActionFunction: ShowWidgetHeaderActionFunction = null;
+      if (useShowWidgetHeaderActionFunction && isNotEmptyStr(descriptor.showWidgetActionFunction)) {
+        try {
+          showWidgetHeaderActionFunction =
+            new Function('widgetContext', 'data', descriptor.showWidgetActionFunction) as ShowWidgetHeaderActionFunction;
+        } catch (e) {
+          useShowWidgetHeaderActionFunction = false;
+        }
+      }
       const headerAction: WidgetHeaderAction = {
         name: descriptor.name,
         displayName: descriptor.displayName,
         icon: descriptor.icon,
         descriptor,
+        useShowWidgetHeaderActionFunction,
+        showWidgetHeaderActionFunction,
         onAction: $event => {
           const entityInfo = this.getActiveEntityInfo();
           const entityId = entityInfo ? entityInfo.entityId : null;
@@ -507,6 +528,9 @@ export class WidgetComponent extends PageComponent implements OnInit, AfterViewI
             this.widgetInstanceInited = true;
             if (this.dataUpdatePending) {
               this.widgetTypeInstance.onDataUpdated();
+              setTimeout(() => {
+                this.dashboardWidget.updateCustomHeaderActions(true);
+              }, 0);
               this.dataUpdatePending = false;
             }
             if (this.pendingMessage) {
@@ -844,6 +868,9 @@ export class WidgetComponent extends PageComponent implements OnInit, AfterViewI
           if (this.displayWidgetInstance()) {
             if (this.widgetInstanceInited) {
               this.widgetTypeInstance.onDataUpdated();
+              setTimeout(() => {
+                this.dashboardWidget.updateCustomHeaderActions(true);
+              }, 0);
             } else {
               this.dataUpdatePending = true;
             }

@@ -25,6 +25,8 @@ import { IterableDiffer, KeyValueDiffer } from '@angular/core';
 import { IAliasController, IStateController } from '@app/core/api/widget-api.models';
 import { enumerable } from '@shared/decorators/enumerable';
 import { UtilsService } from '@core/services/utils.service';
+import { FormattedData } from '@home/components/widget/lib/maps/map-models';
+import { parseData } from '@home/components/widget/lib/maps/common-maps-utils';
 
 export interface WidgetsData {
   widgets: Array<Widget>;
@@ -438,13 +440,45 @@ export class DashboardWidget implements GridsterItem, IDashboardWidget {
 
     this.showWidgetActions = !this.widgetContext.hideTitlePanel;
 
-    this.customHeaderActions = this.widgetContext.customHeaderActions ? this.widgetContext.customHeaderActions : [];
+    this.updateCustomHeaderActions();
     this.widgetActions = this.widgetContext.widgetActions ? this.widgetContext.widgetActions : [];
     if (detectChanges) {
       this.widgetContext.detectContainerChanges();
     }
   }
 
+  updateCustomHeaderActions(detectChanges = false) {
+    let customHeaderActions: Array<WidgetHeaderAction>;
+    if (this.widgetContext.customHeaderActions) {
+      let data: FormattedData[] = [];
+      if (this.widgetContext.customHeaderActions.some(action => action.useShowWidgetHeaderActionFunction)) {
+        data = parseData(this.widgetContext.data || []);
+      }
+      customHeaderActions = this.widgetContext.customHeaderActions.filter(action => this.filterCustomHeaderAction(action, data));
+    } else {
+      customHeaderActions = [];
+    }
+    if (!isEqual(this.customHeaderActions, customHeaderActions)) {
+      this.customHeaderActions = customHeaderActions;
+      if (detectChanges) {
+        this.widgetContext.detectContainerChanges();
+      }
+    }
+  }
+
+  private filterCustomHeaderAction(action: WidgetHeaderAction, data: FormattedData[]): boolean {
+    if (action.useShowWidgetHeaderActionFunction) {
+      try {
+        return action.showWidgetHeaderActionFunction(this.widgetContext, data);
+      } catch (e) {
+        console.warn('Failed to execute showWidgetHeaderActionFunction', e);
+        return false;
+      }
+    } else {
+      return true;
+    }
+  }
+
   @enumerable(true)
   get x(): number {
     let res;

@@ -79,6 +79,7 @@ import { SortOrder } from '@shared/models/page/sort-order';
 import { DomSanitizer } from '@angular/platform-browser';
 import { Router } from '@angular/router';
 import { catchError, map, mergeMap, switchMap } from 'rxjs/operators';
+import { FormattedData } from '@home/components/widget/lib/maps/map-models';
 
 export interface IWidgetAction {
   name: string;
@@ -86,9 +87,13 @@ export interface IWidgetAction {
   onAction: ($event: Event) => void;
 }
 
+export type ShowWidgetHeaderActionFunction = (ctx: WidgetContext, data: FormattedData[]) => boolean;
+
 export interface WidgetHeaderAction extends IWidgetAction {
   displayName: string;
   descriptor: WidgetActionDescriptor;
+  useShowWidgetHeaderActionFunction: boolean;
+  showWidgetHeaderActionFunction: ShowWidgetHeaderActionFunction;
 }
 
 export interface WidgetAction extends IWidgetAction {

@@ -390,6 +390,63 @@ export const widgetContextCompletions: TbEditorCompletions = {
           meta: 'property',
           type: 'number'
         },
+        currentUser: {
+          description: 'Current user object.',
+          meta: 'property',
+          type: '<a href="https://github.com/thingsboard/thingsboard/blob/13e6b10b7ab830e64d31b99614a9d95a1a25928a/ui-ngx/src/app/shared/models/user.model.ts#L45">AuthUser</a>',
+          children: {
+            sub: {
+              description: 'User subject (email).',
+              meta: 'property',
+              type: 'string'
+            },
+            scopes: {
+              description: 'User security scopes.',
+              meta: 'property',
+              type: 'Array<string>'
+            },
+            userId: {
+              description: 'User id.',
+              meta: 'property',
+              type: 'string'
+            },
+            firstName: {
+              description: 'User first name.',
+              meta: 'property',
+              type: 'string'
+            },
+            lastName: {
+              description: 'User last name.',
+              meta: 'property',
+              type: 'string'
+            },
+            enabled: {
+              description: 'Whether is user enabled.',
+              meta: 'property',
+              type: 'boolean'
+            },
+            tenantId: {
+              description: 'Tenant id of the user.',
+              meta: 'property',
+              type: 'string'
+            },
+            customerId: {
+              description: 'Customer id of the user (available when user belongs to specific customer).',
+              meta: 'property',
+              type: 'string'
+            },
+            isPublic: {
+              description: 'Special flag indicating public user.',
+              meta: 'property',
+              type: 'boolean'
+            },
+            authority: {
+              description: 'User authority. Possible values: SYS_ADMIN, TENANT_ADMIN, CUSTOMER_USER',
+              meta: 'property',
+              type: '<a href="https://github.com/thingsboard/thingsboard/blob/13e6b10b7ab830e64d31b99614a9d95a1a25928a/ui-ngx/src/app/shared/models/authority.enum.ts#L17">Authority</a>'
+            }
+          }
+        },
         hideTitlePanel: {
           description: 'Manages visibility of widget title panel. Useful for widget with custom title panels or different states. <b>updateWidgetParams()</b> function must be called after this property change.',
           meta: 'property',

@@ -462,6 +462,8 @@ export interface WidgetActionDescriptor extends CustomActionDescriptor {
   setEntityId?: boolean;
   stateEntityParamName?: string;
   mobileAction?: WidgetMobileActionDescriptor;
+  useShowWidgetActionFunction?: boolean;
+  showWidgetActionFunction?: string;
 }
 
 export interface WidgetComparisonSettings {

@@ -3038,6 +3038,7 @@
         "action-name-required": "Action name is required.",
         "action-name-not-unique": "Another action with the same name already exists.<br/>Action name should be unique within the same action source.",
         "action-icon": "Icon",
+        "use-show-widget-action-function": "Use show widget action function",
         "action-type": "Type",
         "action-type-required": "Action type is required.",
         "edit-action": "Edit action",