ssh-key-action/src/main.ts

import * as fs from "fs";
import * as path from "path";

import * as core from "@actions/core";

/**
 * main function
 */
function main(): void
{
	try
	{
		const home = getHomeDirectory();
		const dirName = path.resolve(home, ".ssh");
		fs.mkdirSync(dirName, {
			recursive: true,
			mode: 0o700,
		});

		const privateKey = core.getInput("private-key") as string;
		const publicKey = core.getInput("public-key") as string;
		const name = core.getInput("name") as string;

		const fileName = path.join(dirName, name);
		fs.writeFileSync(fileName, privateKey, {
			mode: 0o400,
		});
		fs.writeFileSync(`${fileName}.pub`, publicKey, {
			mode: 0o444,
		});

		console.log(`SSH key has been stored to ${fileName} successfully.`);
	}
	catch(err)
	{
		core.setFailed(err.message);
	}
}

/**
 * get home directory
 * @returns home directory
 */
function getHomeDirectory(): string
{
	const homeEnv = process.platform == "win32" ? "USERPROFILE" : "HOME";
	const home = process.env[homeEnv];
	if(home === undefined)
	{
		throw new Error(`${homeEnv} is not defined`);
	}

	return home;
}

main();