Download mutliple files as zip

Adds the possitibility to download folders
and multiple files as zip.

client/package.json

@@ -59,6 +59,7 @@
         "css-element-queries": "^1.2.3",
         "exceljs": "1.15.0",
         "file-saver": "^2.0.2",
+        "jszip": "^3.5.0",
         "lz4js": "^0.2.0",
         "material-icon-font": "git+https://github.com/petergng/materialIconFont.git",
         "moment": "^2.24.0",

client/src/app/core/core-services/http.service.ts

@@ -273,4 +273,26 @@ export class HttpService {
     public async delete<T>(path: string, data?: any, queryParams?: QueryParams, header?: HttpHeaders): Promise<T> {
         return await this.send<T>(path, HTTPMethod.DELETE, data, queryParams, header);
     }
+
+    /**
+     * Retrieves a binary file from the url and returns a base64 value
+     *
+     * @param url file url
+     * @returns a promise with a base64 string
+     */
+    public async downloadAsBase64(url: string): Promise<string> {
+        return new Promise<string>(async (resolve, reject) => {
+            const headers = new HttpHeaders();
+            const file = await this.get<Blob>(url, {}, {}, headers, 'blob');
+            const reader = new FileReader();
+            reader.readAsDataURL(file);
+            reader.onload = () => {
+                const resultStr: string = reader.result as string;
+                resolve(resultStr.split(',')[1]);
+            };
+            reader.onerror = error => {
+                reject(error);
+            };
+        });
+    }
 }

client/src/app/core/pdf-services/pdf-document.service.ts

@@ -1,4 +1,3 @@
-import { HttpHeaders } from '@angular/common/http';
 import { Injectable } from '@angular/core';
 import { MatSnackBar } from '@angular/material/snack-bar';
 
@@ -100,7 +99,7 @@ export class PdfDocumentService {
         );
 
         const promises = fontPathList.map(fontPath => {
-            return this.convertUrlToBase64(fontPath).then(base64 => {
+            return this.httpService.downloadAsBase64(fontPath).then(base64 => {
                 return {
                     [fontPath.split('/').pop()]: base64
                 };
@@ -117,29 +116,6 @@ export class PdfDocumentService {
         return vfs;
     }
 
-    /**
-     * Retrieves a binary file from the url and returns a base64 value
-     *
-     * @param url file url
-     * @returns a promise with a base64 string
-     */
-    private async convertUrlToBase64(url: string): Promise<string> {
-        return new Promise<string>((resolve, reject) => {
-            const headers = new HttpHeaders();
-            this.httpService.get<Blob>(url, {}, {}, headers, 'blob').then(file => {
-                const reader = new FileReader();
-                reader.readAsDataURL(file);
-                reader.onload = () => {
-                    const resultStr: string = reader.result as string;
-                    resolve(resultStr.split(',')[1]);
-                };
-                reader.onerror = error => {
-                    reject(error);
-                };
-            });
-        });
-    }
-
     /**
      * Returns the name of a font from the value of the given
      * config variable.
@@ -665,7 +641,7 @@ export class PdfDocumentService {
         }
 
         if (!vfs[url]) {
-            const base64 = await this.convertUrlToBase64(url);
+            const base64 = await this.httpService.downloadAsBase64(url);
             vfs[url] = base64;
         }
     }

client/src/app/core/repositories/mediafiles/mediafile-repository.service.ts

@@ -2,6 +2,8 @@ import { HttpHeaders } from '@angular/common/http';
 import { Injectable } from '@angular/core';
 
 import { TranslateService } from '@ngx-translate/core';
+import { saveAs } from 'file-saver';
+import * as JSZip from 'jszip';
 import { BehaviorSubject, Observable } from 'rxjs';
 import { first, map } from 'rxjs/operators';
 
@@ -136,6 +138,18 @@ export class MediafileRepositoryService extends BaseIsListOfSpeakersContentObjec
         return this.httpService.post<Identifiable>('/rest/mediafiles/mediafile/', file, {}, emptyHeader);
     }
 
+    public async downloadArchive(archiveName: string, files: ViewMediafile[]): Promise<void> {
+        const zip = new JSZip();
+        for (const file of files) {
+            if (!file.is_directory) {
+                const base64Data = await this.httpService.downloadAsBase64(file.url);
+                zip.file(file.filename, base64Data, { base64: true });
+            }
+        }
+        const archive = await zip.generateAsync({ type: 'blob' });
+        saveAs(archive, archiveName);
+    }
+
     public getDirectoryBehaviorSubject(): BehaviorSubject<ViewMediafile[]> {
         return this.directoryBehaviorSubject;
     }

client/src/app/site/mediafiles/components/mediafile-list/mediafile-list.component.html

@@ -229,12 +229,20 @@
 <!-- Menu for Mediafiles -->
 <mat-menu #mediafilesMenu="matMenu">
     <div *ngIf="!isMultiSelect">
+        <button mat-menu-item (click)="downloadMultiple()">
+            <mat-icon>cloud_download</mat-icon>
+            <span>{{ 'Download folder' | translate }}</span>
+        </button>
         <button mat-menu-item *osPerms="'mediafiles.can_manage'" (click)="toggleMultiSelect()">
             <mat-icon>library_add</mat-icon>
             <span>{{ 'Multiselect' | translate }}</span>
         </button>
     </div>
     <div *ngIf="isMultiSelect">
+        <button mat-menu-item [disabled]="!selectedRows.length" (click)="downloadMultiple(selectedRows)">
+            <mat-icon>cloud_download</mat-icon>
+            <span>{{ 'Download selected' | translate }}</span>
+        </button>
         <button mat-menu-item [disabled]="!selectedRows.length" (click)="move(moveDialog, selectedRows)">
             <mat-icon>near_me</mat-icon>
             <span>{{ 'Move' | translate }}</span>

client/src/app/site/mediafiles/components/mediafile-list/mediafile-list.component.ts

@@ -23,6 +23,7 @@ import { OperatorService, Permission } from 'app/core/core-services/operator.ser
 import { StorageService } from 'app/core/core-services/storage.service';
 import { MediafileRepositoryService } from 'app/core/repositories/mediafiles/mediafile-repository.service';
 import { GroupRepositoryService } from 'app/core/repositories/users/group-repository.service';
+import { ConfigService } from 'app/core/ui-services/config.service';
 import { MediaManageService } from 'app/core/ui-services/media-manage.service';
 import { PromptService } from 'app/core/ui-services/prompt.service';
 import { ViewportService } from 'app/core/ui-services/viewport.service';
@@ -202,7 +203,8 @@ export class MediafileListComponent extends BaseListViewComponent<ViewMediafile>
         private fb: FormBuilder,
         private formBuilder: FormBuilder,
         private groupRepo: GroupRepositoryService,
-        private cd: ChangeDetectorRef
+        private cd: ChangeDetectorRef,
+        private configService: ConfigService
     ) {
         super(titleService, translate, matSnackBar, storage);
         this.canMultiSelect = true;
@@ -459,6 +461,16 @@ export class MediafileListComponent extends BaseListViewComponent<ViewMediafile>
         });
     }
 
+    public downloadMultiple(mediafiles: ViewMediafile[] = this.dataSource.source): void {
+        /**
+         * TODO: naming the files is discussable
+         */
+        const eventName = this.configService.instant<string>('general_event_name');
+        const dirName = this.directory?.filename ?? this.translate.instant('Files');
+        const archiveName = `${eventName} - ${dirName}`.trim();
+        this.repo.downloadArchive(archiveName, mediafiles);
+    }
+
     public move(templateRef: TemplateRef<string>, mediafiles: ViewMediafile[]): void {
         this.moveForm.reset();