install.js

var http = require('http');
var fs = require('fs');
var os = require('os');
var exec = require('child_process').exec;

var targetDir = __dirname + '/tools/';
try {
    fs.statSync(targetDir);
} catch (e) {
    fs.mkdirSync(targetDir);
}

var platform = null;
if (os.type() == 'Darwin') {
    platform = 'macosx';
} else if (os.type() == 'Linux') {
    platform = 'linux';
} else {
    throw new Error('Unknown OS!');
}

function attemptDownload(attemptsLeft) {
    var url = "http://dl-ssl.google.com/android/repository/platform-tools_r16-" + platform + ".zip";
    var tempFile = "/tmp/platform-tools-" + (new Date().getTime()) + ".zip";

    var file = fs.createWriteStream(tempFile);
    var request = http.get(url, function(response) {
        response.pipe(file);
        response.on('end', function () {
            exec("unzip -j -o " + tempFile + " platform-tools/aapt -d tools/", function (err) {
                if (err) {
                    if (attemptsLeft === 0) {
                        throw err;
                    } else {
                        attemptDownload(attemptsLeft - 1);
                        return;
                    }
                }
                fs.chmodSync('tools/aapt', '755');
                fs.unlinkSync(tempFile);
                process.exit();
            });
        });
    });
}

attemptDownload(3);