init f0ckm

src/lib/smtp.mjs

@@ -0,0 +1,119 @@
+import tls from "tls";
+import net from "net";
+import { Buffer } from "buffer";
+
+export const sendMail = (config, options) => {
+    return new Promise((resolve, reject) => {
+        const { host, port, secure, user, password, from } = config;
+        const { to, subject, body } = options;
+
+        let socket;
+        let step = 0;
+
+        const connect = () => {
+            if (secure) {
+                socket = tls.connect(port, host, () => {
+                    console.log(`[SMTP] Securely connected to ${host}:${port}`);
+                });
+            } else {
+                socket = net.connect(port, host, () => {
+                    console.log(`[SMTP] Connected to ${host}:${port}`);
+                });
+            }
+
+            socket.on("data", onData);
+            socket.on("error", (err) => reject(err));
+            socket.on("timeout", () => {
+                socket.destroy();
+                reject(new Error("SMTP Timeout"));
+            });
+        };
+
+        const send = (data) => {
+            socket.write(data + "\r\n");
+        };
+
+        const onData = (data) => {
+            const response = data.toString();
+            // console.log(`[SMTP] step ${step} server: ${response.trim()}`);
+
+            if (response.startsWith("220") && step === 0) {
+                send(`EHLO ${host}`);
+                step = 1;
+            } else if (response.startsWith("250") && step === 1) {
+                if (!secure && response.includes("STARTTLS")) {
+                    send("STARTTLS");
+                    step = 1.5;
+                } else {
+                    handleAuth();
+                }
+            } else if (response.startsWith("220") && step === 1.5) {
+                // Upgrade to TLS
+                const secureSocket = tls.connect({
+                    socket: socket,
+                    host: host
+                }, () => {
+                    // console.log("[SMTP] STARTTLS successful");
+                });
+                socket.removeAllListeners("data");
+                socket = secureSocket;
+                socket.on("data", onData);
+                socket.on("error", (err) => reject(err));
+                send(`EHLO ${host}`);
+                step = 1.9;
+            } else if (response.startsWith("250") && step === 1.9) {
+                handleAuth();
+            } else if (response.startsWith("334") && step === 2) {
+                send(Buffer.from(user).toString("base64"));
+                step = 3;
+            } else if (response.startsWith("334") && step === 3) {
+                send(Buffer.from(password).toString("base64"));
+                step = 4;
+            } else if (response.startsWith("235") && step === 4) {
+                send(`MAIL FROM:<${from}>`);
+                step = 5;
+            } else if (response.startsWith("250") && (step === 4 || step === 5)) {
+                // If we didn't use AUTH, we might land here after MAIL FROM
+                if (step === 4) {
+                    send(`MAIL FROM:<${from}>`);
+                    step = 5;
+                } else {
+                    send(`RCPT TO:<${to}>`);
+                    step = 6;
+                }
+            } else if (response.startsWith("250") && step === 6) {
+                send("DATA");
+                step = 7;
+            } else if (response.startsWith("354") && step === 7) {
+                const message = [
+                    `From: ${from}`,
+                    `To: ${to}`,
+                    `Subject: ${subject}`,
+                    `Content-Type: text/plain; charset=UTF-8`,
+                    "",
+                    body,
+                    "."
+                ].join("\r\n");
+                send(message);
+                step = 8;
+            } else if (response.startsWith("250") && step === 8) {
+                send("QUIT");
+                resolve(true);
+            } else if (response.startsWith("5") || response.startsWith("4")) {
+                reject(new Error(`SMTP Error: ${response.trim()}`));
+            }
+        };
+
+        const handleAuth = () => {
+            if (user && password) {
+                send("AUTH LOGIN");
+                step = 2;
+            } else {
+                send(`MAIL FROM:<${from}>`);
+                step = 5;
+            }
+        };
+
+        connect();
+    });
+};