Add Import/Export service.

@@ -782,6 +782,24 @@ export class EntityService {
     }
     }
   }
   }
 
 
+  public checkEntityAlias(entityAlias: EntityAlias): Observable<boolean> {
+    return this.resolveAliasFilter(entityAlias.filter, null, 1, true).pipe(
+      map((result) => {
+        if (result.stateEntity) {
+          return true;
+        } else {
+          const entities = result.entities;
+          if (entities && entities.length) {
+            return true;
+          } else {
+            return false;
+          }
+        }
+      }),
+      catchError(err => of(false))
+    );
+  }
+
   private entitiesToEntitiesInfo(entities: Array<BaseData<EntityId>>): Array<EntityInfo> {
   private entitiesToEntitiesInfo(entities: Array<BaseData<EntityId>>): Array<EntityInfo> {
     const entitiesInfo = [];
     const entitiesInfo = [];
     if (entities) {
     if (entities) {

@@ -16,7 +16,7 @@
 
 
 import { Injectable } from '@angular/core';
 import { Injectable } from '@angular/core';
 import { Dashboard, DashboardLayoutId } from '@app/shared/models/dashboard.models';
 import { Dashboard, DashboardLayoutId } from '@app/shared/models/dashboard.models';
-import { EntityAlias, EntityAliasFilter, EntityAliases, EntityAliasInfo } from '@shared/models/alias.models';
+import { EntityAlias, EntityAliasFilter, EntityAliases, EntityAliasInfo, AliasesInfo } from '@shared/models/alias.models';
 import { DatasourceType, Widget, WidgetPosition, WidgetSize } from '@shared/models/widget.models';
 import { DatasourceType, Widget, WidgetPosition, WidgetSize } from '@shared/models/widget.models';
 import { DashboardUtilsService } from '@core/services/dashboard-utils.service';
 import { DashboardUtilsService } from '@core/services/dashboard-utils.service';
 import { deepClone } from '@core/utils';
 import { deepClone } from '@core/utils';
@@ -29,11 +29,6 @@ const WIDGET_ITEM = 'widget_item';
 const WIDGET_REFERENCE = 'widget_reference';
 const WIDGET_REFERENCE = 'widget_reference';
 const RULE_NODES = 'rule_nodes';
 const RULE_NODES = 'rule_nodes';
 
 
-export interface AliasesInfo {
-  datasourceAliases: {[datasourceIndex: number]: EntityAliasInfo};
-  targetDeviceAliases: {[targetDeviceAliasIndex: number]: EntityAliasInfo};
-}
-
 export interface WidgetItem {
 export interface WidgetItem {
   widget: Widget;
   widget: Widget;
   aliasesInfo: AliasesInfo;
   aliasesInfo: AliasesInfo;

@@ -37,14 +37,14 @@ import { UtilsService } from '@core/services/utils.service';
 import { TranslateService } from '@ngx-translate/core';
 import { TranslateService } from '@ngx-translate/core';
 import { ActionNotificationShow } from '@core/notification/notification.actions';
 import { ActionNotificationShow } from '@core/notification/notification.actions';
 import { DialogService } from '@core/services/dialog.service';
 import { DialogService } from '@core/services/dialog.service';
-import { deepClone } from '@core/utils';
+import { deepClone, isUndefined } from '@core/utils';
 import { MatDialog } from '@angular/material/dialog';
 import { MatDialog } from '@angular/material/dialog';
 import { EntityAliasDialogComponent, EntityAliasDialogData } from './entity-alias-dialog.component';
 import { EntityAliasDialogComponent, EntityAliasDialogData } from './entity-alias-dialog.component';
 
 
 export interface EntityAliasesDialogData {
 export interface EntityAliasesDialogData {
   entityAliases: EntityAliases;
   entityAliases: EntityAliases;
   widgets: Array<Widget>;
   widgets: Array<Widget>;
-  isSingleEntityAlias: boolean;
+  isSingleEntityAlias?: boolean;
   isSingleWidget?: boolean;
   isSingleWidget?: boolean;
   allowedEntityTypes?: Array<AliasEntityType>;
   allowedEntityTypes?: Array<AliasEntityType>;
   disableAdd?: boolean;
   disableAdd?: boolean;
@@ -125,14 +125,13 @@ export class EntityAliasesDialogComponent extends DialogComponent<EntityAliasesD
     const entityAliasControls: Array<AbstractControl> = [];
     const entityAliasControls: Array<AbstractControl> = [];
     for (const aliasId of Object.keys(this.data.entityAliases)) {
     for (const aliasId of Object.keys(this.data.entityAliases)) {
       const entityAlias = this.data.entityAliases[aliasId];
       const entityAlias = this.data.entityAliases[aliasId];
-      let filter = entityAlias.filter;
-      if (!filter) {
-        filter = {
+      if (!entityAlias.filter) {
+        entityAlias.filter = {
           resolveMultiple: false
           resolveMultiple: false
         };
         };
       }
       }
-      if (!filter.resolveMultiple) {
-        filter.resolveMultiple = false;
+      if (isUndefined(entityAlias.filter.resolveMultiple)) {
+        entityAlias.filter.resolveMultiple = false;
       }
       }
       entityAliasControls.push(this.createEntityAliasFormControl(aliasId, entityAlias));
       entityAliasControls.push(this.createEntityAliasFormControl(aliasId, entityAlias));
     }
     }

@@ -58,6 +58,8 @@ import { CustomActionPrettyResourcesTabsComponent } from './widget/action/custom
 import { CustomActionPrettyEditorComponent } from './widget/action/custom-action-pretty-editor.component';
 import { CustomActionPrettyEditorComponent } from './widget/action/custom-action-pretty-editor.component';
 import { CustomDialogService } from './widget/dialog/custom-dialog.service';
 import { CustomDialogService } from './widget/dialog/custom-dialog.service';
 import { CustomDialogContainerComponent } from './widget/dialog/custom-dialog-container.component';
 import { CustomDialogContainerComponent } from './widget/dialog/custom-dialog-container.component';
+import { ImportExportService } from './import-export/import-export.service';
+import { ImportDialogComponent } from './import-export/import-dialog.component';
 
 
 @NgModule({
 @NgModule({
   entryComponents: [
   entryComponents: [
@@ -75,7 +77,8 @@ import { CustomDialogContainerComponent } from './widget/dialog/custom-dialog-co
     DataKeyConfigDialogComponent,
     DataKeyConfigDialogComponent,
     LegendConfigPanelComponent,
     LegendConfigPanelComponent,
     WidgetActionDialogComponent,
     WidgetActionDialogComponent,
-    CustomDialogContainerComponent
+    CustomDialogContainerComponent,
+    ImportDialogComponent
   ],
   ],
   declarations:
   declarations:
     [
     [
@@ -117,7 +120,8 @@ import { CustomDialogContainerComponent } from './widget/dialog/custom-dialog-co
       WidgetActionDialogComponent,
       WidgetActionDialogComponent,
       CustomActionPrettyResourcesTabsComponent,
       CustomActionPrettyResourcesTabsComponent,
       CustomActionPrettyEditorComponent,
       CustomActionPrettyEditorComponent,
-      CustomDialogContainerComponent
+      CustomDialogContainerComponent,
+      ImportDialogComponent
     ],
     ],
   imports: [
   imports: [
     CommonModule,
     CommonModule,
@@ -154,11 +158,13 @@ import { CustomDialogContainerComponent } from './widget/dialog/custom-dialog-co
     WidgetActionDialogComponent,
     WidgetActionDialogComponent,
     CustomActionPrettyResourcesTabsComponent,
     CustomActionPrettyResourcesTabsComponent,
     CustomActionPrettyEditorComponent,
     CustomActionPrettyEditorComponent,
-    CustomDialogContainerComponent
+    CustomDialogContainerComponent,
+    ImportDialogComponent
   ],
   ],
   providers: [
   providers: [
     WidgetComponentService,
     WidgetComponentService,
-    CustomDialogService
+    CustomDialogService,
+    ImportExportService
   ]
   ]
 })
 })
 export class HomeComponentsModule { }
 export class HomeComponentsModule { }

+<!--
+
+    Copyright © 2016-2019 The Thingsboard Authors
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+<form #importForm="ngForm" [formGroup]="importFormGroup" (ngSubmit)="importFromJson()">
+  <mat-toolbar fxLayout="row" color="primary">
+    <h2 translate>{{ importTitle }}</h2>
+    <span fxFlex></span>
+    <button mat-button mat-icon-button
+            (click)="cancel()"
+            type="button">
+      <mat-icon class="material-icons">close</mat-icon>
+    </button>
+  </mat-toolbar>
+  <mat-progress-bar color="warn" mode="indeterminate" *ngIf="isLoading$ | async">
+  </mat-progress-bar>
+  <div mat-dialog-content>
+    <fieldset [disabled]="isLoading$ | async">
+      <div fxFlex fxLayout="column">
+        <tb-file-input
+          [contentConvertFunction]="loadDataFromJsonContent"
+          formControlName="jsonContent"
+          required
+          label="{{importFileLabel | translate}}"
+          dropLabel="{{ 'import.drop-file' | translate }}"
+          accept=".json,application/json"
+          allowedExtensions="json">
+        </tb-file-input>
+      </div>
+    </fieldset>
+  </div>
+  <div mat-dialog-actions fxLayout="row">
+    <span fxFlex></span>
+    <button mat-button mat-raised-button color="primary"
+            type="submit"
+            [disabled]="(isLoading$ | async) || importFormGroup.invalid || !importFormGroup.dirty">
+      {{ 'action.import' | translate }}
+    </button>
+    <button mat-button color="primary"
+            style="margin-right: 20px;"
+            type="button"
+            [disabled]="(isLoading$ | async)"
+            (click)="cancel()" cdkFocusInitial>
+      {{ 'action.cancel' | translate }}
+    </button>
+  </div>
+</form>

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { Component, Inject, OnInit, SkipSelf } from '@angular/core';
+import { ErrorStateMatcher, MAT_DIALOG_DATA, MatDialogRef } from '@angular/material';
+import { Store } from '@ngrx/store';
+import { AppState } from '@core/core.state';
+import {
+  AbstractControl,
+  FormArray,
+  FormBuilder,
+  FormControl,
+  FormGroup,
+  FormGroupDirective,
+  NgForm, Validators, ValidatorFn
+} from '@angular/forms';
+import { Router } from '@angular/router';
+import { DialogComponent } from '@app/shared/components/dialog.component';
+import { AttributeData } from '@shared/models/telemetry/telemetry.models';
+import { EntityAlias, EntityAliases, EntityAliasFilter } from '@shared/models/alias.models';
+import { DatasourceType, Widget, widgetType } from '@shared/models/widget.models';
+import { AliasEntityType, EntityType } from '@shared/models/entity-type.models';
+import { UtilsService } from '@core/services/utils.service';
+import { TranslateService } from '@ngx-translate/core';
+import { ActionNotificationShow } from '@core/notification/notification.actions';
+import { DialogService } from '@core/services/dialog.service';
+import { EntityService } from '@core/http/entity.service';
+import { Observable, of } from 'rxjs';
+
+export interface ImportDialogData {
+  importTitle: string;
+  importFileLabel: string;
+}
+
+@Component({
+  selector: 'tb-import-dialog',
+  templateUrl: './import-dialog.component.html',
+  providers: [{provide: ErrorStateMatcher, useExisting: ImportDialogComponent}],
+  styleUrls: []
+})
+export class ImportDialogComponent extends DialogComponent<ImportDialogComponent, any>
+  implements OnInit, ErrorStateMatcher {
+
+  importTitle: string;
+  importFileLabel: string;
+
+  importFormGroup: FormGroup;
+
+  submitted = false;
+
+  constructor(protected store: Store<AppState>,
+              protected router: Router,
+              @Inject(MAT_DIALOG_DATA) public data: ImportDialogData,
+              @SkipSelf() private errorStateMatcher: ErrorStateMatcher,
+              public dialogRef: MatDialogRef<ImportDialogComponent, any>,
+              private fb: FormBuilder) {
+    super(store, router, dialogRef);
+    this.importTitle = data.importTitle;
+    this.importFileLabel = data.importFileLabel;
+
+    this.importFormGroup = this.fb.group({
+      jsonContent: [null, [Validators.required]]
+    });
+  }
+
+  ngOnInit(): void {
+  }
+
+  isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
+    const originalErrorState = this.errorStateMatcher.isErrorState(control, form);
+    const customErrorState = !!(control && control.invalid && this.submitted);
+    return originalErrorState || customErrorState;
+  }
+
+  loadDataFromJsonContent(content: string): any {
+    try {
+      const importData = JSON.parse(content);
+      return importData;
+    } catch (err) {
+      this.store.dispatch(new ActionNotificationShow({message: err.message, type: 'error'}));
+      return null;
+    }
+  }
+
+  cancel(): void {
+    this.dialogRef.close(null);
+  }
+
+  importFromJson(): void {
+    this.submitted = true;
+    const importData = this.importFormGroup.get('jsonContent').value;
+    this.dialogRef.close(importData);
+  }
+}

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { Widget } from '@app/shared/models/widget.models';
+import { DashboardLayoutId } from '@shared/models/dashboard.models';
+
+export interface ImportWidgetResult {
+  widget: Widget;
+  layoutId: DashboardLayoutId;
+}

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { Inject, Injectable } from '@angular/core';
+import { DashboardService } from '@core/http/dashboard.service';
+import { TranslateService } from '@ngx-translate/core';
+import { Store } from '@ngrx/store';
+import { AppState } from '@core/core.state';
+import { ActionNotificationShow } from '@core/notification/notification.actions';
+import { Dashboard, DashboardLayoutId } from '@shared/models/dashboard.models';
+import { deepClone, isDefined, isObject, isUndefined } from '@core/utils';
+import { WINDOW } from '@core/services/window.service';
+import { DOCUMENT } from '@angular/common';
+import {
+  AliasesInfo,
+  AliasFilterType,
+  EntityAlias,
+  EntityAliases,
+  EntityAliasFilter,
+  EntityAliasInfo
+} from '@shared/models/alias.models';
+import { MatDialog } from '@angular/material/dialog';
+import { ImportDialogComponent, ImportDialogData } from '@home/components/import-export/import-dialog.component';
+import { forkJoin, Observable, of } from 'rxjs';
+import { catchError, map, mergeMap } from 'rxjs/operators';
+import { DashboardUtilsService } from '@core/services/dashboard-utils.service';
+import { EntityService } from '@core/http/entity.service';
+import { Widget, WidgetSize } from '@shared/models/widget.models';
+import {
+  EntityAliasesDialogComponent,
+  EntityAliasesDialogData
+} from '@home/components/alias/entity-aliases-dialog.component';
+import { ItemBufferService, WidgetItem } from '@core/services/item-buffer.service';
+import { ImportWidgetResult } from './import-export.models';
+import { EntityType } from '@shared/models/entity-type.models';
+import { UtilsService } from '@core/services/utils.service';
+
+@Injectable()
+export class ImportExportService {
+
+  constructor(@Inject(WINDOW) private window: Window,
+              @Inject(DOCUMENT) private document: Document,
+              private store: Store<AppState>,
+              private translate: TranslateService,
+              private dashboardService: DashboardService,
+              private dashboardUtils: DashboardUtilsService,
+              private entityService: EntityService,
+              private utils: UtilsService,
+              private itembuffer: ItemBufferService,
+              private dialog: MatDialog) {
+
+  }
+
+  public exportDashboard(dashboardId: string) {
+    this.dashboardService.getDashboard(dashboardId).subscribe(
+      (dashboard) => {
+        let name = dashboard.title;
+        name = name.toLowerCase().replace(/\W/g, '_');
+        this.exportToPc(this.prepareDashboardExport(dashboard), name + '.json');
+      },
+      (e) => {
+        let message = e;
+        if (!message) {
+          message = this.translate.instant('error.unknown-error');
+        }
+        this.store.dispatch(new ActionNotificationShow(
+          {message: this.translate.instant('dashboard.export-failed-error', {error: message}),
+            type: 'error'}));
+      }
+    );
+  }
+
+  public importDashboard(): Observable<Dashboard> {
+    return this.openImportDialog('dashboard.import', 'dashboard.dashboard-file').pipe(
+      mergeMap((dashboard: Dashboard) => {
+        if (!this.validateImportedDashboard(dashboard)) {
+          this.store.dispatch(new ActionNotificationShow(
+            {message: this.translate.instant('dashboard.invalid-dashboard-file-error'),
+              type: 'error'}));
+          throw new Error('Invalid dashboard file');
+        } else {
+          dashboard = this.dashboardUtils.validateAndUpdateDashboard(dashboard);
+          let aliasIds = null;
+          const entityAliases = dashboard.configuration.entityAliases;
+          if (entityAliases) {
+            aliasIds = Object.keys(entityAliases);
+          }
+          if (aliasIds && aliasIds.length > 0) {
+            return this.processEntityAliases(entityAliases, aliasIds).pipe(
+              mergeMap((missingEntityAliases) => {
+                if (Object.keys(missingEntityAliases).length > 0) {
+                  return this.editMissingAliases(this.dashboardUtils.getWidgetsArray(dashboard),
+                    false, 'dashboard.dashboard-import-missing-aliases-title',
+                    missingEntityAliases).pipe(
+                    mergeMap((updatedEntityAliases) => {
+                      for (const aliasId of Object.keys(updatedEntityAliases)) {
+                        entityAliases[aliasId] = updatedEntityAliases[aliasId];
+                      }
+                      return this.saveImportedDashboard(dashboard);
+                    })
+                  );
+                } else {
+                  return this.saveImportedDashboard(dashboard);
+                }
+              }
+             ));
+          } else {
+            return this.saveImportedDashboard(dashboard);
+          }
+        }
+      }),
+      catchError((err) => {
+        return of(null);
+      })
+    );
+  }
+
+  public exportWidget(dashboard: Dashboard, sourceState: string, sourceLayout: DashboardLayoutId, widget: Widget) {
+    const widgetItem = this.itembuffer.prepareWidgetItem(dashboard, sourceState, sourceLayout, widget);
+    let name = widgetItem.widget.config.title;
+    name = name.toLowerCase().replace(/\W/g, '_');
+    this.exportToPc(this.prepareExport(widgetItem), name + '.json');
+  }
+
+  public importWidget(dashboard: Dashboard, targetState: string,
+                      targetLayoutFunction: () => Observable<DashboardLayoutId>,
+                      onAliasesUpdateFunction: () => void): Observable<ImportWidgetResult> {
+    return this.openImportDialog('dashboard.import-widget', 'dashboard.widget-file').pipe(
+      mergeMap((widgetItem: WidgetItem) => {
+        if (!this.validateImportedWidget(widgetItem)) {
+          this.store.dispatch(new ActionNotificationShow(
+            {message: this.translate.instant('dashboard.invalid-widget-file-error'),
+              type: 'error'}));
+          throw new Error('Invalid widget file');
+        } else {
+          let widget = widgetItem.widget;
+          widget = this.dashboardUtils.validateAndUpdateWidget(widget);
+          const aliasesInfo = this.prepareAliasesInfo(widgetItem.aliasesInfo);
+          const originalColumns = widgetItem.originalColumns;
+          const originalSize = widgetItem.originalSize;
+
+          const datasourceAliases = aliasesInfo.datasourceAliases;
+          const targetDeviceAliases = aliasesInfo.targetDeviceAliases;
+          if (datasourceAliases || targetDeviceAliases) {
+            const entityAliases: EntityAliases = {};
+            const datasourceAliasesMap: {[aliasId: string]: number} = {};
+            const targetDeviceAliasesMap: {[aliasId: string]: number} = {};
+            let aliasId: string;
+            let datasourceIndex: number;
+            if (datasourceAliases) {
+              for (const strIndex of Object.keys(datasourceAliases)) {
+                datasourceIndex = Number(strIndex);
+                aliasId = this.utils.guid();
+                datasourceAliasesMap[aliasId] = datasourceIndex;
+                entityAliases[aliasId] = {id: aliasId, ...datasourceAliases[datasourceIndex]};
+              }
+            }
+            if (targetDeviceAliases) {
+              for (const strIndex of Object.keys(targetDeviceAliases)) {
+                datasourceIndex = Number(strIndex);
+                aliasId = this.utils.guid();
+                targetDeviceAliasesMap[aliasId] = datasourceIndex;
+                entityAliases[aliasId] = {id: aliasId, ...targetDeviceAliases[datasourceIndex]};
+              }
+            }
+            const aliasIds = Object.keys(entityAliases);
+            if (aliasIds.length > 0) {
+              return this.processEntityAliases(entityAliases, aliasIds).pipe(
+                mergeMap((missingEntityAliases) => {
+                    if (Object.keys(missingEntityAliases).length > 0) {
+                      return this.editMissingAliases([widget],
+                        false, 'dashboard.widget-import-missing-aliases-title',
+                        missingEntityAliases).pipe(
+                        mergeMap((updatedEntityAliases) => {
+                          for (const id of Object.keys(updatedEntityAliases)) {
+                            const entityAlias = updatedEntityAliases[id];
+                            let index;
+                            if (isDefined(datasourceAliasesMap[id])) {
+                              index = datasourceAliasesMap[id];
+                              datasourceAliases[index] = entityAlias;
+                            } else if (isDefined(targetDeviceAliasesMap[id])) {
+                              index = targetDeviceAliasesMap[id];
+                              targetDeviceAliases[index] = entityAlias;
+                            }
+                          }
+                          return this.addImportedWidget(dashboard, targetState, targetLayoutFunction, widget,
+                            aliasesInfo, onAliasesUpdateFunction, originalColumns, originalSize);
+                        }
+                      ));
+                    } else {
+                      return this.addImportedWidget(dashboard, targetState, targetLayoutFunction, widget,
+                        aliasesInfo, onAliasesUpdateFunction, originalColumns, originalSize);
+                    }
+                  }
+                )
+              );
+            } else {
+              return this.addImportedWidget(dashboard, targetState, targetLayoutFunction, widget,
+                aliasesInfo, onAliasesUpdateFunction, originalColumns, originalSize);
+            }
+          } else {
+            return this.addImportedWidget(dashboard, targetState, targetLayoutFunction, widget,
+              aliasesInfo, onAliasesUpdateFunction, originalColumns, originalSize);
+          }
+        }
+      }),
+      catchError((err) => {
+        return of(null);
+      })
+    );
+  }
+
+  private validateImportedDashboard(dashboard: Dashboard): boolean {
+    if (isUndefined(dashboard.title) || isUndefined(dashboard.configuration)) {
+      return false;
+    }
+    return true;
+  }
+
+  private validateImportedWidget(widgetItem: WidgetItem): boolean {
+    if (isUndefined(widgetItem.widget)
+      || isUndefined(widgetItem.aliasesInfo)
+      || isUndefined(widgetItem.originalColumns)) {
+      return false;
+    }
+    const widget = widgetItem.widget;
+    if (isUndefined(widget.isSystemType) ||
+      isUndefined(widget.bundleAlias) ||
+      isUndefined(widget.typeAlias) ||
+      isUndefined(widget.type)) {
+      return false;
+    }
+    return true;
+  }
+
+  private saveImportedDashboard(dashboard: Dashboard): Observable<Dashboard> {
+    return this.dashboardService.saveDashboard(dashboard);
+  }
+
+  private addImportedWidget(dashboard: Dashboard, targetState: string,
+                            targetLayoutFunction: () => Observable<DashboardLayoutId>,
+                            widget: Widget, aliasesInfo: AliasesInfo, onAliasesUpdateFunction: () => void,
+                            originalColumns: number, originalSize: WidgetSize): Observable<ImportWidgetResult> {
+    return targetLayoutFunction().pipe(
+      mergeMap((targetLayout) => {
+        return this.itembuffer.addWidgetToDashboard(dashboard, targetState, targetLayout,
+          widget, aliasesInfo, onAliasesUpdateFunction, originalColumns, originalSize, -1, -1).pipe(
+          map(() => ({widget, layoutId: targetLayout} as ImportWidgetResult))
+        );
+      }
+    ));
+  }
+
+  private processEntityAliases(entityAliases: EntityAliases, aliasIds: string[]): Observable<EntityAliases> {
+    const tasks: Observable<EntityAlias>[] = [];
+    for (const aliasId of aliasIds) {
+      const entityAlias = entityAliases[aliasId];
+      tasks.push(
+        this.entityService.checkEntityAlias(entityAlias).pipe(
+          map((result) => {
+            if (!result) {
+              const missingEntityAlias = deepClone(entityAlias);
+              missingEntityAlias.filter = null;
+              return missingEntityAlias;
+            }
+            return null;
+          }
+          )
+        )
+      );
+    }
+    return forkJoin(tasks).pipe(
+      map((missingAliasesArray) => {
+          missingAliasesArray = missingAliasesArray.filter(alias => alias !== null);
+          const missingEntityAliases: EntityAliases = {};
+          for (const missingAlias of missingAliasesArray) {
+            missingEntityAliases[missingAlias.id] = missingAlias;
+          }
+          return missingEntityAliases;
+        }
+      )
+    );
+  }
+
+  private editMissingAliases(widgets: Array<Widget>, isSingleWidget: boolean,
+                             customTitle: string, missingEntityAliases: EntityAliases): Observable<EntityAliases> {
+    return this.dialog.open<EntityAliasesDialogComponent, EntityAliasesDialogData,
+      EntityAliases>(EntityAliasesDialogComponent, {
+      disableClose: true,
+      panelClass: ['tb-dialog', 'tb-fullscreen-dialog'],
+      data: {
+        entityAliases: missingEntityAliases,
+        widgets,
+        customTitle,
+        isSingleWidget,
+        disableAdd: true
+      }
+    }).afterClosed().pipe(
+      map((updatedEntityAliases) => {
+        if (updatedEntityAliases) {
+          return updatedEntityAliases;
+        } else {
+          throw new Error('Unable to resolve missing entity aliases!');
+        }
+      }
+    ));
+  }
+
+  private prepareAliasesInfo(aliasesInfo: AliasesInfo): AliasesInfo {
+    const datasourceAliases = aliasesInfo.datasourceAliases;
+    const targetDeviceAliases = aliasesInfo.targetDeviceAliases;
+    if (datasourceAliases || targetDeviceAliases) {
+      if (datasourceAliases) {
+        for (const strIndex of Object.keys(datasourceAliases)) {
+          const datasourceIndex = Number(strIndex);
+          datasourceAliases[datasourceIndex] = this.prepareEntityAlias(datasourceAliases[datasourceIndex]);
+        }
+      }
+      if (targetDeviceAliases) {
+        for (const strIndex of Object.keys(targetDeviceAliases)) {
+          const datasourceIndex = Number(strIndex);
+          targetDeviceAliases[datasourceIndex] = this.prepareEntityAlias(targetDeviceAliases[datasourceIndex]);
+        }
+      }
+    }
+    return aliasesInfo;
+  }
+
+  private prepareEntityAlias(aliasInfo: EntityAliasInfo): EntityAliasInfo {
+    let alias: string;
+    let filter: EntityAliasFilter;
+    if (aliasInfo.deviceId) {
+      alias = aliasInfo.aliasName;
+      filter = {
+        type: AliasFilterType.entityList,
+        entityType: EntityType.DEVICE,
+        entityList: [aliasInfo.deviceId],
+        resolveMultiple: false
+      };
+    } else if (aliasInfo.deviceFilter) {
+      alias = aliasInfo.aliasName;
+      filter = {
+        type: aliasInfo.deviceFilter.useFilter ? AliasFilterType.entityName : AliasFilterType.entityList,
+        entityType: EntityType.DEVICE,
+        resolveMultiple: false
+      };
+      if (filter.type === AliasFilterType.entityList) {
+        filter.entityList = aliasInfo.deviceFilter.deviceList;
+      } else {
+        filter.entityNameFilter = aliasInfo.deviceFilter.deviceNameFilter;
+      }
+    } else if (aliasInfo.entityFilter) {
+      alias = aliasInfo.aliasName;
+      filter = {
+        type: aliasInfo.entityFilter.useFilter ? AliasFilterType.entityName : AliasFilterType.entityList,
+        entityType: aliasInfo.entityType,
+        resolveMultiple: false
+      };
+      if (filter.type === AliasFilterType.entityList) {
+        filter.entityList = aliasInfo.entityFilter.entityList;
+      } else {
+        filter.entityNameFilter = aliasInfo.entityFilter.entityNameFilter;
+      }
+    } else {
+      alias = aliasInfo.alias;
+      filter = aliasInfo.filter;
+    }
+    return {
+      alias,
+      filter
+    };
+  }
+
+  private openImportDialog(importTitle: string, importFileLabel: string): Observable<any> {
+    return this.dialog.open<ImportDialogComponent, ImportDialogData,
+      any>(ImportDialogComponent, {
+      disableClose: true,
+      panelClass: ['tb-dialog', 'tb-fullscreen-dialog'],
+      data: {
+        importTitle,
+        importFileLabel
+      }
+    }).afterClosed().pipe(
+      map((importedData) => {
+        if (importedData) {
+          return importedData;
+        } else {
+          throw new Error('No file selected!');
+        }
+      }
+    ));
+  }
+
+  private exportToPc(data: any, filename: string) {
+    if (!data) {
+      console.error('No data');
+      return;
+    }
+    if (!filename) {
+      filename = 'download.json';
+    }
+    if (isObject(data)) {
+      data = JSON.stringify(data, null,  2);
+    }
+    const blob = new Blob([data], {type: 'text/json'});
+    if (this.window.navigator && this.window.navigator.msSaveOrOpenBlob) {
+      this.window.navigator.msSaveOrOpenBlob(blob, filename);
+    } else {
+      const e = this.document.createEvent('MouseEvents');
+      const a = this.document.createElement('a');
+      a.download = filename;
+      a.href = this.window.URL.createObjectURL(blob);
+      a.dataset.downloadurl = ['text/json', a.download, a.href].join(':');
+      // @ts-ignore
+      e.initEvent('click', true, false, this.window,
+        0, 0, 0, 0, 0, false, false, false, false, 0, null);
+      a.dispatchEvent(e);
+    }
+  }
+
+  private prepareDashboardExport(dashboard: Dashboard): Dashboard {
+    dashboard = this.prepareExport(dashboard);
+    delete dashboard.assignedCustomers;
+    return dashboard;
+  }
+
+  private prepareExport(data: any): any {
+    const exportedData = deepClone(data);
+    if (isDefined(exportedData.id)) {
+      delete exportedData.id;
+    }
+    if (isDefined(exportedData.createdTime)) {
+      delete exportedData.createdTime;
+    }
+    if (isDefined(exportedData.tenantId)) {
+      delete exportedData.tenantId;
+    }
+    if (isDefined(exportedData.customerId)) {
+      delete exportedData.customerId;
+    }
+    return exportedData;
+  }
+
+}

@@ -83,6 +83,7 @@ import {
   ManageDashboardStatesDialogComponent,
   ManageDashboardStatesDialogComponent,
   ManageDashboardStatesDialogData
   ManageDashboardStatesDialogData
 } from '@home/pages/dashboard/states/manage-dashboard-states-dialog.component';
 } from '@home/pages/dashboard/states/manage-dashboard-states-dialog.component';
+import { ImportExportService } from '@home/components/import-export/import-export.service';
 
 
 @Component({
 @Component({
   selector: 'tb-dashboard-page',
   selector: 'tb-dashboard-page',
@@ -222,6 +223,7 @@ export class DashboardPageComponent extends PageComponent implements IDashboardC
               private widgetComponentService: WidgetComponentService,
               private widgetComponentService: WidgetComponentService,
               private dashboardService: DashboardService,
               private dashboardService: DashboardService,
               private itembuffer: ItemBufferService,
               private itembuffer: ItemBufferService,
+              private importExport: ImportExportService,
               private fb: FormBuilder,
               private fb: FormBuilder,
               private dialog: MatDialog,
               private dialog: MatDialog,
               private translate: TranslateService,
               private translate: TranslateService,
@@ -459,8 +461,7 @@ export class DashboardPageComponent extends PageComponent implements IDashboardC
     if ($event) {
     if ($event) {
       $event.stopPropagation();
       $event.stopPropagation();
     }
     }
-    // TODO:
-    this.dialogService.todo();
+    this.importExport.exportDashboard(this.currentDashboardId);
   }
   }
 
 
   public openEntityAliases($event: Event) {
   public openEntityAliases($event: Event) {
@@ -569,8 +570,16 @@ export class DashboardPageComponent extends PageComponent implements IDashboardC
     if ($event) {
     if ($event) {
       $event.stopPropagation();
       $event.stopPropagation();
     }
     }
-    // TODO:
-    this.dialogService.todo();
+    this.importExport.importWidget(this.dashboard, this.dashboardCtx.state,
+      this.selectTargetLayout.bind(this), this.entityAliasesUpdated.bind(this)).subscribe(
+      (importData) => {
+        if (importData) {
+          const widget = importData.widget;
+          const layoutId = importData.layoutId;
+          this.layouts[layoutId].layoutCtx.widgets.addWidgetId(widget.id);
+        }
+      }
+    );
   }
   }
 
 
   public currentDashboardIdChanged(dashboardId: string) {
   public currentDashboardIdChanged(dashboardId: string) {
@@ -915,8 +924,7 @@ export class DashboardPageComponent extends PageComponent implements IDashboardC
 
 
   exportWidget($event: Event, layoutCtx: DashboardPageLayoutContext, widget: Widget) {
   exportWidget($event: Event, layoutCtx: DashboardPageLayoutContext, widget: Widget) {
     $event.stopPropagation();
     $event.stopPropagation();
-    // TODO:
-    this.dialogService.todo();
+    this.importExport.exportWidget(this.dashboard, this.dashboardCtx.state, layoutCtx.id, widget);
   }
   }
 
 
   widgetClicked($event: Event, layoutCtx: DashboardPageLayoutContext, widget: Widget) {
   widgetClicked($event: Event, layoutCtx: DashboardPageLayoutContext, widget: Widget) {

@@ -63,6 +63,7 @@ import {
   MakeDashboardPublicDialogData
   MakeDashboardPublicDialogData
 } from '@modules/home/pages/dashboard/make-dashboard-public-dialog.component';
 } from '@modules/home/pages/dashboard/make-dashboard-public-dialog.component';
 import { DashboardTabsComponent } from '@home/pages/dashboard/dashboard-tabs.component';
 import { DashboardTabsComponent } from '@home/pages/dashboard/dashboard-tabs.component';
+import { ImportExportService } from '@home/components/import-export/import-export.service';
 
 
 @Injectable()
 @Injectable()
 export class DashboardsTableConfigResolver implements Resolve<EntityTableConfig<DashboardInfo | Dashboard>> {
 export class DashboardsTableConfigResolver implements Resolve<EntityTableConfig<DashboardInfo | Dashboard>> {
@@ -73,6 +74,7 @@ export class DashboardsTableConfigResolver implements Resolve<EntityTableConfig<
               private dashboardService: DashboardService,
               private dashboardService: DashboardService,
               private customerService: CustomerService,
               private customerService: CustomerService,
               private dialogService: DialogService,
               private dialogService: DialogService,
+              private importExport: ImportExportService,
               private translate: TranslateService,
               private translate: TranslateService,
               private datePipe: DatePipe,
               private datePipe: DatePipe,
               private router: Router,
               private router: Router,
@@ -311,19 +313,20 @@ export class DashboardsTableConfigResolver implements Resolve<EntityTableConfig<
   }
   }
 
 
   importDashboard($event: Event) {
   importDashboard($event: Event) {
-    if ($event) {
-      $event.stopPropagation();
-    }
-    // TODO:
-    this.dialogService.todo();
+    this.importExport.importDashboard().subscribe(
+      (dashboard) => {
+        if (dashboard) {
+          this.config.table.updateData();
+        }
+      }
+    );
   }
   }
 
 
   exportDashboard($event: Event, dashboard: DashboardInfo) {
   exportDashboard($event: Event, dashboard: DashboardInfo) {
     if ($event) {
     if ($event) {
       $event.stopPropagation();
       $event.stopPropagation();
     }
     }
-    // TODO:
-    this.dialogService.todo();
+    this.importExport.exportDashboard(dashboard.id.id);
   }
   }
 
 
   addDashboardsToCustomer($event: Event) {
   addDashboardsToCustomer($event: Event) {

+<!--
+
+    Copyright © 2016-2019 The Thingsboard Authors
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+<div class="tb-container">
+  <label class="tb-title">{{ label }}</label>
+  <ng-container #flow="flow"
+                [flowConfig]="{singleFile: true, allowDuplicateUploads: true}">
+    <div class="tb-file-select-container">
+      <div class="tb-file-clear-container">
+        <button mat-button mat-icon-button color="primary"
+                type="button"
+                (click)="clearFile()"
+                class="tb-file-clear-btn"
+                matTooltip="{{ 'action.remove' | translate }}"
+                matTooltipPosition="above">
+          <mat-icon>close</mat-icon>
+        </button>
+      </div>
+      <div class="drop-area tb-flow-drop"
+           flowDrop
+           [flow]="flow.flowJs">
+        <label for="select">{{ dropLabel }}</label>
+        <input class="file-input" flowButton [flow]="flow.flowJs" [flowAttributes]="{accept: accept}" id="select">
+      </div>
+    </div>
+  </ng-container>
+</div>
+<div>
+  <div *ngIf="!fileName" translate>import.no-file</div>
+  <div *ngIf="fileName">{{ fileName }}</div>
+</div>

+/**
+ * Copyright © 2016-2019 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+@import "../../../scss/constants";
+
+$previewSize: 100px !default;
+
+:host {
+
+  .tb-container {
+    margin-top: 0px;
+    label.tb-title {
+      display: block;
+      padding-bottom: 8px;
+    }
+  }
+
+  .tb-file-select-container {
+    position: relative;
+    width: 100%;
+    height: $previewSize;
+  }
+
+  .tb-file-preview {
+    width: auto;
+    max-width: $previewSize;
+    height: auto;
+    max-height: $previewSize;
+  }
+
+  .tb-file-clear-container {
+    position: relative;
+    float: right;
+    width: 48px;
+    height: $previewSize;
+  }
+
+  .tb-file-clear-btn {
+    position: absolute !important;
+    top: 50%;
+    transform: translate(0%, -50%) !important;
+  }
+
+  .file-input {
+    display: none;
+  }
+
+  .tb-flow-drop {
+    position: relative;
+    height: $previewSize;
+    overflow: hidden;
+    border: dashed 2px;
+
+    label {
+      display: flex;
+      flex-direction: column;
+      justify-content: center;
+      width: 100%;
+      height: 100%;
+      font-size: 16px;
+      text-align: center;
+
+      @media #{$mat-gt-sm} {
+        font-size: 24px;
+      }
+    }
+  }
+}

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+
+import { AfterViewInit, Component, forwardRef, Input, OnDestroy, ViewChild } from '@angular/core';
+import { PageComponent } from '@shared/components/page.component';
+import { Store } from '@ngrx/store';
+import { AppState } from '@core/core.state';
+import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
+import { Subscription } from 'rxjs';
+import { coerceBooleanProperty } from '@angular/cdk/coercion';
+import { FlowDirective } from '@flowjs/ngx-flow';
+
+@Component({
+  selector: 'tb-file-input',
+  templateUrl: './file-input.component.html',
+  styleUrls: ['./file-input.component.scss'],
+  providers: [
+    {
+      provide: NG_VALUE_ACCESSOR,
+      useExisting: forwardRef(() => FileInputComponent),
+      multi: true
+    }
+  ]
+})
+export class FileInputComponent extends PageComponent implements AfterViewInit, OnDestroy, ControlValueAccessor {
+
+  @Input()
+  label: string;
+
+  @Input()
+  accept = '*/*';
+
+  @Input()
+  allowedExtensions: string;
+
+  @Input()
+  dropLabel: string;
+
+  @Input()
+  contentConvertFunction: (content: string) => any;
+
+  private requiredValue: boolean;
+  get required(): boolean {
+    return this.requiredValue;
+  }
+  @Input()
+  set required(value: boolean) {
+    const newVal = coerceBooleanProperty(value);
+    if (this.requiredValue !== newVal) {
+      this.requiredValue = newVal;
+    }
+  }
+
+  @Input()
+  disabled: boolean;
+
+  fileName: string;
+  fileContent: any;
+
+  @ViewChild('flow', {static: true})
+  flow: FlowDirective;
+
+  autoUploadSubscription: Subscription;
+
+  private propagateChange = null;
+
+  constructor(protected store: Store<AppState>) {
+    super(store);
+  }
+
+  ngAfterViewInit() {
+    this.autoUploadSubscription = this.flow.events$.subscribe(event => {
+      if (event.type === 'fileAdded') {
+        const file = event.event[0] as flowjs.FlowFile;
+        if (this.filterFile(file)) {
+          const reader = new FileReader();
+          reader.onload = (loadEvent) => {
+            if (typeof reader.result === 'string') {
+              const fileContent = reader.result;
+              if (fileContent && fileContent.length > 0) {
+                if (this.contentConvertFunction) {
+                  this.fileContent = this.contentConvertFunction(fileContent);
+                } else {
+                  this.fileContent = fileContent;
+                }
+                if (this.fileContent) {
+                  this.fileName = file.name;
+                } else {
+                  this.fileName = null;
+                }
+                this.updateModel();
+              }
+            }
+          };
+          reader.readAsText(file.file);
+        }
+      }
+    });
+  }
+
+  private filterFile(file: flowjs.FlowFile): boolean {
+    if (this.allowedExtensions) {
+      return this.allowedExtensions.split(',').indexOf(file.getExtension()) > -1;
+    } else {
+      return true;
+    }
+  }
+
+  ngOnDestroy() {
+    this.autoUploadSubscription.unsubscribe();
+  }
+
+  registerOnChange(fn: any): void {
+    this.propagateChange = fn;
+  }
+
+  registerOnTouched(fn: any): void {
+  }
+
+  setDisabledState(isDisabled: boolean): void {
+    this.disabled = isDisabled;
+  }
+
+  writeValue(value: any): void {
+    this.fileName = null;
+  }
+
+  private updateModel() {
+    this.propagateChange(this.fileContent);
+  }
+
+  clearFile() {
+    this.fileName = null;
+    this.fileContent = null;
+    this.updateModel();
+  }
+}

@@ -18,7 +18,7 @@
 <div class="tb-container">
 <div class="tb-container">
   <label class="tb-title">{{label}}</label>
   <label class="tb-title">{{label}}</label>
   <ng-container #flow="flow"
   <ng-container #flow="flow"
-                [flowConfig]="{singleFile: true}">
+                [flowConfig]="{singleFile: true, allowDuplicateUploads: true}">
     <div class="tb-image-select-container">
     <div class="tb-image-select-container">
       <div class="tb-image-preview-container">
       <div class="tb-image-preview-container">
         <div *ngIf="!safeImageUrl" translate>dashboard.no-image</div>
         <div *ngIf="!safeImageUrl" translate>dashboard.no-image</div>

@@ -135,11 +135,16 @@ export interface EntityAliasFilter extends EntityFilters {
 export interface EntityAliasInfo {
 export interface EntityAliasInfo {
   alias: string;
   alias: string;
   filter: EntityAliasFilter;
   filter: EntityAliasFilter;
+  [key: string]: any;
+}
+
+export interface AliasesInfo {
+  datasourceAliases: {[datasourceIndex: number]: EntityAliasInfo};
+  targetDeviceAliases: {[targetDeviceAliasIndex: number]: EntityAliasInfo};
 }
 }
 
 
 export interface EntityAlias extends EntityAliasInfo {
 export interface EntityAlias extends EntityAliasInfo {
   id: string;
   id: string;
-  [key: string]: any;
 }
 }
 
 
 export interface EntityAliases {
 export interface EntityAliases {

@@ -111,6 +111,7 @@ import { JsonFormComponent } from './components/json-form/json-form.component';
 import { MaterialIconsDialogComponent } from '@shared/components/dialog/material-icons-dialog.component';
 import { MaterialIconsDialogComponent } from '@shared/components/dialog/material-icons-dialog.component';
 import { MaterialIconSelectComponent } from '@shared/components/material-icon-select.component';
 import { MaterialIconSelectComponent } from '@shared/components/material-icon-select.component';
 import { ImageInputComponent } from './components/image-input.component';
 import { ImageInputComponent } from './components/image-input.component';
+import { FileInputComponent } from './components/file-input.component';
 
 
 @NgModule({
 @NgModule({
   providers: [
   providers: [
@@ -181,6 +182,7 @@ import { ImageInputComponent } from './components/image-input.component';
     MaterialIconSelectComponent,
     MaterialIconSelectComponent,
     JsonFormComponent,
     JsonFormComponent,
     ImageInputComponent,
     ImageInputComponent,
+    FileInputComponent,
     NospacePipe,
     NospacePipe,
     MillisecondsToTimeStringPipe,
     MillisecondsToTimeStringPipe,
     EnumToArrayPipe,
     EnumToArrayPipe,
@@ -318,6 +320,7 @@ import { ImageInputComponent } from './components/image-input.component';
     MaterialIconSelectComponent,
     MaterialIconSelectComponent,
     JsonFormComponent,
     JsonFormComponent,
     ImageInputComponent,
     ImageInputComponent,
+    FileInputComponent,
     NospacePipe,
     NospacePipe,
     MillisecondsToTimeStringPipe,
     MillisecondsToTimeStringPipe,
     EnumToArrayPipe,
     EnumToArrayPipe,