From d78fbf730e873a2ea799a9b92f8e3b68d45a745a Mon Sep 17 00:00:00 2001
From: fullgream <fullgream@i2pmail.org>
Date: Tue, 27 May 2025 04:09:38 +0300
Subject: [PATCH] Add IMAP server func

---
 imap/index.js | 24 ++++++++++++++++++++++
 imap/logic.js | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++
 server.js     | 15 ++++++++++++++
 3 files changed, 95 insertions(+)
 create mode 100644 imap/index.js
 create mode 100644 imap/logic.js

diff --git a/imap/index.js b/imap/index.js
new file mode 100644
index 0000000..e41fce5
--- /dev/null
+++ b/imap/index.js
@@ -0,0 +1,24 @@
+const net = require("net");
+const imap = require("./logic");
+//const EventEmitter = require("events");
+
+const server = net.createServer((socket) => {
+	const client = new imap.Client(socket);
+	socket.write("* OK IMAP4rev1 NodeIMAP Ready\r\n");
+	
+	let state = "not_authenticated";
+	let currentMailbox = null;
+	//let tag = "";
+	
+	socket.on("data", (data) => {
+		const line = data.toString().trim();
+		console.debug("IMAP data:", line);
+		const splitted = line.split(/\s{1,}/g);
+		if (splitted.length < 2) return socket.write(". BAD unknown command\r\n");
+		const [tag, command, ...args] = splitted;
+		
+		client.command(tag, command, args);
+	});
+});
+
+module.exports = server;
diff --git a/imap/logic.js b/imap/logic.js
new file mode 100644
index 0000000..19bc80f
--- /dev/null
+++ b/imap/logic.js
@@ -0,0 +1,56 @@
+class IMAPController {
+	constructor (socket, tag) {
+		this.socket = socket;
+		this.tag = tag;
+	}
+	
+	out (answer) {
+		this.socket.write(`${this.tag} ${answer}`);
+	}
+	
+	untaggedOut (answer) {
+		this.socket.write(answer);
+	}
+	
+	close () {
+		this.socket.end();
+	}
+}
+
+class Commands {
+	constructor (client) {
+		this.client = client;
+	}
+	
+	async capability (args, controller) {
+		/*if (args.length > 0)
+			return out();*/
+		controller.untaggedOut("* CAPABILITY IMAP4rev1 STARTTLS LOGINDISABLED\r\n");
+		controller.out("OK CAPABILITY completed\r\n");
+	}
+	
+	async logout(args, controller) {
+		controller.untaggedOut("* BYE Logging out\r\n");
+		controller.out("OK LOGOUT completed\r\n");
+		
+		controller.close();
+	}
+}
+
+class Client {
+	constructor (socket) {
+		this.socket = socket;
+		this.commands = new Commands(this);
+	}
+	
+	command (tag, command, args) {
+		//console.debug("this >>", this, this.socket, this.commands);
+		const cmd = this.commands[command.toLowerCase()];
+		if (cmd === undefined) {
+			return this.socket.write(`${tag} BAD unknown command\r\n`);
+		}
+		cmd.call(this.commands, args, new IMAPController(this.socket, tag));
+	}
+}
+
+module.exports = { Client };
diff --git a/server.js b/server.js
index e930a9d..2f072d9 100644
--- a/server.js
+++ b/server.js
@@ -3,6 +3,8 @@ const fs = require("fs");
 const net = require('net');
 const { EventEmitter } = require("events");
 
+const imap = require("./imap");
+
 const initalConfig = `{
     "pop3-config": {
         "user": "example",
@@ -55,3 +57,16 @@ pop3.init().then(() => {
 		//console.log(str);
 	}, 1);
 });
+
+imap.listen(
+	global.config["imap-config"].port,
+	global.config["imap-config"].host,
+	(err) => {
+		if (err) throw err;
+		console.log(`IMAP server running on ${
+			global.config["imap-config"].host
+		}:${
+			global.config["imap-config"].port
+		}`);
+	}
+);