nest-fastify-multer

Install

``sh
npm i nest-fastify-multer
`

External Dependency Packages

Before installing and using this package you must make sure you have fastify-multer installed.

`sh
npm i fastify-multer
`
You must configure this in the main.js of your Nest application.

`js
import { NestFactory } from '@nestjs/core';
import {
FastifyAdapter,
NestFastifyApplication,
} from '@nestjs/platform-fastify';
import { AppModule } from './app.module';
import { contentParser } from 'fastify-multer';

async function bootstrap() {
const app = await NestFactory.create(
AppModule,
new FastifyAdapter()
);
await app.register(contentParser);
await app.listen(3000);
}

bootstrap()
`

Usage

`ts
import {
Body,
Controller,
Post,
Req,
UploadedFile,
} from '@nestjs/common';

// import the filters to use from the module.
import {
FastifyFileInterceptor,
FastifyFilesInterceptor,
FastifyFileFieldsInterceptor,
} from 'nest-fastify-multer';

// import multer to use your methods
import { diskStorage } from 'multer';

@Controller('image')
export class ImageController {

@Post('uploadFile')
// use this interceptor to specify one file
@FastifyFileInterceptor(
// fileName
'avatar',
// here you can add any multer configuration.
{
storage: diskStorage({
destination: './upload/single', // path where the file will be downloaded
filename: editFileName, // here you can put your own function to edit multer file name when saving to local disk
}),
fileFilter: imageFileFilter, // here you can put your own function to filter the received files
}
)
uploadFile(
@Req() req: Request,
// use this param decorator to capture the file. The file type Express.Multer.File is used as this is used.
@UploadedFiles() file: Express.Multer.File,
) {
return file;
}

@Post('uploadFiles')
// use this interceptor to specify more than one file
@FastifyFilesInterceptor(
// fileName
'avatar',
// maxCount
1,
// here you can add any multer configuration.
{
storage: diskStorage({
destination: './upload/single', // path where the file will be downloaded
filename: editFileName, // here you can put your own function to edit multer file name when saving to local disk
}),
fileFilter: imageFileFilter, // here you can put your own function to filter the received files
}
)
uploadFiles(
@Req() req: Request,
// use this param decorator to capture the files. The file type Express.Multer.File is used as this is used.
@UploadedFile() files: Express.Multer.File[],
) {
return files;
}

@Post('uploadFileFields')
// use this interceptor to specify more than one field containing files
@FastifyFileFieldsInterceptor(
// specify here the array of field name and maximum number of files allowed in this field.
[{ name: 'avatar', maxCount: 1 }, { name: 'background', maxCount: 1 }],
// here you can add any multer configuration.
{
storage: diskStorage({
destination: './upload/single', // path where the file will be downloaded
filename: editFileName, // here you can put your own function to edit multer file name when saving to local disk
}),
fileFilter: imageFileFilter, // here you can put your own function to filter the received files
}
)
uploadFileFields(
@Req() req: Request,
// use this param decorator to capture the files. The file type Express.Multer.File is used as this is used.
@UploadedFile() files: { avatar?: Express.Multer.File[], background?: Express.Multer.File[] },
) {
return files;
}

}
`
A possible implementation of the editFileName and imageFileFilter methods is provided.

`ts
import { extname } from 'path';

export const editFileName = (
req: Request,
file: Express.Multer.File,
callback
) => {
const name = file.originalname.split('.')[0];
const fileExtName = extname(file.originalname);
const randomName = Array(4)
.fill(null)
.map(() => Math.round(Math.random() * 16).toString(16))
.join('');
callback(null, ${name}-${randomName}${fileExtName});
};

export const imageFileFilter = (
req: Request,
file: Express.Multer.File,
callback
) => {
if (!file.originalname.match(/\.(jpg|jpeg|png|gif)$/)) {
return callback(new Error('Only image files are allowed!'), false);
}
callback(null, true);
};
``