Download attachments from EML file

eml-download-attachments.js

const EmlParser = require('eml-parser');
const fs = require('fs');
const path = require('path');

// Define paths
const filesPath = 'files';
const resultsPathPrefix = 'results';
const timestamp = new Date().toISOString().replace(/[:]/g, '-').split('.')[0];
const resultsPath = path.join(resultsPathPrefix, timestamp);

const createDirectory = (dirPath) => {
	if (!fs.existsSync(dirPath)) {
		fs.mkdirSync(dirPath, { recursive: true });
	}
};
createDirectory(resultsPath);

const saveAttachment = (attachment) => {
	const filePath = path.join(resultsPath, attachment.filename);
	fs.writeFileSync(filePath, attachment.content);
	console.log(`Attachment saved: ${filePath}`);
};

const getAttachments = (emlFilePath) => {
	return new Promise((resolve, reject) => {
		const file = fs.createReadStream(emlFilePath);
		new EmlParser(file)
			.getEmailAttachments({ ignoreEmbedded: true })
			.then((attachments) => {
				attachments.forEach((attachment) => {
					console.log(`Processing attachment: ${attachment.filename}`);
					saveAttachment(attachment);
				});
				resolve();
			})
			.catch((err) => {
				console.error(`Error processing file: ${emlFilePath}`, err.message);
				reject(err);
			});
	});
};

const files = fs.readdirSync(filesPath);
for (const file of files) {
	console.log('==============================================');
	console.log('Email:', file);
	const emlFilePath = path.join(filesPath, file);
	try {
		getAttachments(emlFilePath).then(() => {
			console.log(`Finished processing: ${file}`);
		});
	} catch (error) {
		console.error(`Error processing email: ${file}`, error.message);
	}
	console.log('==============================================');
}