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processEmails.js
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const Imap = require("imap");
const pem = require('pem');
const fs = require('fs');
const path = require('path');
const config = require("./config");
const {simpleParser} = require("mailparser");
const {analyzeEmail} = require("./analyzeEmail");
const {saveLastTimestamp} = require("./utilities");
async function processEmails(timestamp) {
return new Promise(async (resolve, reject) => {
console.log(`\n\n[${new Date(timestamp).toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' })} ${new Date(timestamp).toLocaleTimeString('en-US', { hour: 'numeric', minute: '2-digit', hour12: true })}]`);
console.log(`*** Checking for unread, non-starred messages.`);
const certsDir = path.join(__dirname, 'certs');
const certPath = path.join(certsDir, 'imap-cert.pem');
const keyPath = path.join(certsDir, 'imap-key.pem');
// Ensure the certs directory exists
if (!fs.existsSync(certsDir)) {
fs.mkdirSync(certsDir, { recursive: true });
}
// Check if the certificate and key already exist, generate if not
if (!fs.existsSync(certPath) || !fs.existsSync(keyPath)) {
console.log('Generating new self-signed certificate...');
const keys = await new Promise((resolve, reject) => {
pem.createCertificate({ days: 365, selfSigned: true }, (err, keys) => {
if (err) {
return reject(err);
}
fs.writeFileSync(certPath, keys.certificate);
fs.writeFileSync(keyPath, keys.serviceKey);
resolve(keys);
});
});
}
const cert = fs.readFileSync(certPath);
const key = fs.readFileSync(keyPath);
// Initialize IMAP with TLS configuration
const imapConfig = {
user: process.env.IMAP_USER,
password: process.env.IMAP_PASSWORD,
host: 'imap.gmail.com',
port: 993,
tls: true,
tlsOptions: {
key: key,
cert: cert,
rejectUnauthorized: false // For development use only; be cautious with this in production
}
};
const imap = new Imap(imapConfig);
function openInbox(cb) {
imap.openBox('INBOX', false, cb);
}
imap.once('ready', async function () {
openInbox(async function (err, box) {
if (err) throw err;
// Use search criteria to get unread emails since the last timestamp
imap.search(['UNSEEN', ['SINCE', new Date(timestamp)]], async function (err, results) {
if (err) throw err;
if (results.length > 0) {
const fetchOptions = {
bodies: '',
struct: true,
markSeen: false // Do not mark emails as seen automatically
};
const f = imap.fetch(results, fetchOptions);
let emailPromises = []; // Create an array to hold promises for each email processed
let i = 0;
f.on('message', function (msg, seqno) {
if (i > config.settings.maxEmailsToProcessAtOnce) return;
const attributesPromise = new Promise((resolve) => msg.once('attributes', resolve)); // Move this outside
const emailPromise = new Promise((resolve, reject) => {
msg.on('body', function (stream, info) {
simpleParser(stream)
.then(async email => {
const attributes = await attributesPromise;
// Check if the email is flagged as \\Starred; if so, do not process further
if (!attributes.flags.includes('\\Flagged')) {
const emailBody = (email?.text) ? email.text : email.html;
const emailAnalysis = await analyzeEmail(email.subject, email.from.text, emailBody.substring(0, config.settings.maxEmailChars), email.date);
if (emailAnalysis.judgment !== 'unknown') {
// After determining if an email is worth reading or not
if (emailAnalysis.judgment === true) {
// Flag the message as important
if (config.settings.starAllKeptEmails) imap.addFlags(attributes.uid, ['\\Flagged'], function (err) {
if (err) console.log('Error starring email:', err);
});
} else if (emailAnalysis.judgment === false) {
// Mark the message as seen and remove the primary inbox label
if (config.settings.markAllRejectedEmailsRead) imap.setFlags(attributes.uid, ['\\Seen'], function (err) {
if (err) console.log('Error marking email as seen:', err);
});
const folderToMoveTo = (config.settings.sortIntoCategoryFolders) ? emailAnalysis.category : config.settings.rejectedFolderName;
// Copy the message to "AI Rejects" label for archiving
imap.move(attributes.uid, folderToMoveTo, function (err) {
if (err) {
console.log(`Error moving email to ${folderToMoveTo}:`, err);
} else {
console.log(`Email moved to ${folderToMoveTo}.`);
}
});
}
i++;
}
}
resolve(); // Resolve the promise after processing the email
})
.catch(err => {
console.error('Error parsing mail:', err);
reject(err); // Reject the promise if there's an error
});
});
});
emailPromises.push(emailPromise); // Add the promise to the array
});
f.once('end', function () {
Promise.all(emailPromises).then(() => {
if (i !== 0) {
console.log(`*** Finished processing ${i} email(s). Enjoy a breath of fresh air.`);
} else {
console.log(`*** No unread, non-starred messages found for any date starting ${new Date(timestamp).toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' })}.`);
}
saveLastTimestamp(new Date().toISOString(), config.settings.timestampFilePath);
imap.end(); // Close the IMAP connection only after all emails have been processed
resolve({statusCode: 200, message: 'Email processing completed.'});
}).catch(error => {
console.error('Error processing some emails:', error);
imap.end(); // Consider closing the IMAP connection even if there are errors
resolve({statusCode: 500, message: 'Error processing email.'});
});
});
} else {
console.log('No new messages to fetch.');
imap.end();
}
});
});
});
imap.connect();
});
}
module.exports = { processEmails };