[TypeScript] axios file upload/download

Settings

• Node.js v18.14.0
• axios v1.3.5

 

file.service.ts

import { AxiosInstance, AxiosRequestConfig } from 'axios';
import { createReadStream, createWriteStream } from 'fs';
import { dirname, join as joinPath } from 'path';
import FormData from 'form-data';
// import { randomString } from 'YOUR_RANDOM_STRING_GENERATOR';

export class FileService {
    constructor(private readonly axios: AxiosInstance) {}

    getExtensionFromUrl(url: string) {
        return url.split(/[#?]/)[0].split('.').pop().trim();
    }

    /**
     * @return saved local image path
     */
    downloadFile(saveDir: string, url: string): Promise<string> {
        return new Promise(async (resolve, reject) => {
            const response = await this.axios.get(url, { responseType: 'stream' });

            const extension = this.getExtensionFromUrl(url);
            const filename = `${randomString()}.${extension}`;
            const savedFilePath = joinPath(dirname(saveDir), filename);

            const writer = createWriteStream(savedFilePath);
            response.data.pipe(writer);
            writer.on('error', reject);
            writer.on('close', () => resolve(savedFilePath));
        });
    }

    /**
     * @param url request url
     * @param filePath local file path
     */
    uploadFile(url: string, filePath: string) {
        const formdata = new FormData();
        formdata.append('file', createReadStream(filePath));

        const config: AxiosRequestConfig = {
            headers: {
                'Content-Type': `multipart/form-data; boundary=${formdata.getBoundary()}`,
            },
        };

        return this.axios.post(url, formdata, config);
    }
}