FilesystemBackend: Implement deleteFile and getFileURL.

We use `fs.unlink` instead of `fs.rm`, as the latter is only available in the fsPromises API since Node 14.14

Signed-off-by: David Mehren <git@herrmehren.de>

src/media/backends/filesystem-backend.ts

@@ -1,26 +1,39 @@
-import { MediaBackend } from '../media-backend.interface';
-import { BackendData } from '../media-upload.entity';
+import { Injectable } from '@nestjs/common';
 import { promises as fs } from 'fs';
 import { join } from 'path';
+import { ConsoleLoggerService } from '../../logger/console-logger.service';
+import { MediaBackend } from '../media-backend.interface';
+import { BackendData } from '../media-upload.entity';
 
+@Injectable()
 export class FilesystemBackend implements MediaBackend {
+  constructor(private readonly logger: ConsoleLoggerService) {
+    this.logger.setContext(FilesystemBackend.name);
+  }
+
   async saveFile(
     buffer: Buffer,
     fileName: string,
   ): Promise<[string, BackendData]> {
-    // TODO: Get uploads directory from config
-    const uploadDirectory = './uploads';
-    // TODO: Add server address to url
-    const filePath = join(uploadDirectory, fileName);
+    const filePath = FilesystemBackend.getFilePath(fileName);
+    this.logger.debug(`Writing file to: ${filePath}`, 'saveFile');
     await fs.writeFile(filePath, buffer, null);
     return ['/' + filePath, null];
   }
 
-  deleteFile(fileName: string, backendData: BackendData): Promise<void> {
-    return Promise.resolve(undefined);
+  async deleteFile(fileName: string, backendData: BackendData): Promise<void> {
+    return fs.unlink(FilesystemBackend.getFilePath(fileName));
   }
 
-  getFileURL(fileNam: string, backendData: BackendData): Promise<string> {
-    return Promise.resolve('');
+  getFileURL(fileName: string, backendData: BackendData): Promise<string> {
+    const filePath = FilesystemBackend.getFilePath(fileName);
+    // TODO: Add server address to url
+    return Promise.resolve('/' + filePath);
+  }
+
+  private static getFilePath(fileName: string): string {
+    // TODO: Get uploads directory from config
+    const uploadDirectory = './uploads';
+    return join(uploadDirectory, fileName);
   }
 }

src/media/media.module.ts

@@ -1,13 +1,20 @@
 import { Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
+import { LoggerModule } from '../logger/logger.module';
 import { NotesModule } from '../notes/notes.module';
 import { UsersModule } from '../users/users.module';
+import { FilesystemBackend } from './backends/filesystem-backend';
 import { MediaUpload } from './media-upload.entity';
 import { MediaService } from './media.service';
 
 @Module({
-  imports: [TypeOrmModule.forFeature([MediaUpload]), NotesModule, UsersModule],
-  providers: [MediaService],
+  imports: [
+    TypeOrmModule.forFeature([MediaUpload]),
+    NotesModule,
+    UsersModule,
+    LoggerModule,
+  ],
+  providers: [MediaService, FilesystemBackend],
   exports: [MediaService],
 })
 export class MediaModule {}

src/media/media.service.ts

@@ -1,4 +1,5 @@
 import { Injectable } from '@nestjs/common';
+import { ModuleRef } from '@nestjs/core';
 import { InjectRepository } from '@nestjs/typeorm';
 import * as FileType from 'file-type';
 import { Repository } from 'typeorm';
@@ -16,6 +17,7 @@ export class MediaService {
     private mediaUploadRepository: Repository<MediaUpload>,
     private notesService: NotesService,
     private usersService: UsersService,
+    private moduleRef: ModuleRef,
   ) {}
 
   public async saveFile(file: MulterFile, username: string, noteId: string) {
@@ -35,7 +37,7 @@ export class MediaService {
       fileTypeResult.ext,
       BackendType.FILEYSTEM,
     );
-    const backend = new FilesystemBackend();
+    const backend = this.moduleRef.get(FilesystemBackend);
     const [url, backendData] = await backend.saveFile(
       file.buffer,
       mediaUpload.id,