feat: add util to configure and get private ssh key for local ssh connection

apps/dokploy/server/wss/utils.ts

@@ -1,4 +1,17 @@
+import { execAsync } from "@dokploy/server/utils/process/execAsync";
 import os from "node:os";
+import path from "node:path";
+import fs from "node:fs";
+
+const HOME_PATH = process.env.HOME || process.env.USERPROFILE || "/";
+
+const LOCAL_SSH_KEY_PATH = path.join(
+	HOME_PATH,
+	".ssh",
+	"auto_generated-dokploy-local",
+);
+
+const AUTHORIZED_KEYS_PATH = path.join(HOME_PATH, ".ssh", "authorized_keys");
 
 export const getShell = () => {
 	switch (os.platform()) {
@@ -10,3 +23,40 @@ export const getShell = () => {
 			return "bash";
 	}
 };
+
+/** Returns private SSH key for dokploy local server terminal. Uses already created SSH key or generates a new SSH key, also automatically appends the public key to `authorized_keys`, creating the file if needed. */
+export const getLocalServerPrivateKey = async () => {
+	try {
+		if (!fs.existsSync(LOCAL_SSH_KEY_PATH)) {
+			// Generate new SSH key if it hasn't been created yet
+			await execAsync(
+				`ssh-keygen -t rsa -b 4096 -f ${LOCAL_SSH_KEY_PATH} -N ""`,
+			);
+		}
+
+		const privateKey = fs.readFileSync(LOCAL_SSH_KEY_PATH, "utf8");
+		const publicKey = fs.readFileSync(`${LOCAL_SSH_KEY_PATH}.pub`, "utf8");
+		const authKeyContent = `${publicKey}\n`;
+
+		if (!fs.existsSync(AUTHORIZED_KEYS_PATH)) {
+			// Create authorized_keys if it doesn't exist yet
+			fs.writeFileSync(AUTHORIZED_KEYS_PATH, authKeyContent, { mode: 0o600 });
+			return privateKey;
+		}
+
+		const existingAuthKeys = fs.readFileSync(AUTHORIZED_KEYS_PATH, "utf8");
+		if (existingAuthKeys.includes(publicKey)) {
+			return privateKey;
+		}
+
+		// Append the public key to authorized_keys
+		fs.appendFileSync(AUTHORIZED_KEYS_PATH, authKeyContent, {
+			mode: 0o600,
+		});
+
+		return privateKey;
+	} catch (error) {
+		console.error("Error getting private SSH key for local terminal:", error);
+		return "";
+	}
+};