Node.js, CoffeeScript, and the Windows Azure Service Management API

smapi.coffee

###
certificate generated via:
    openssl req -x509 -nodes -days 365 -subj "/CN=test" -newkey rsa:1024 -keyout priv.pem -out pub.pem
    openssl x509 -outform der -in pub.pem -out pub.cer
(pub.cer is what's uploaded to Windows Azure via the portal)
###

crypto = require 'crypto'
https = require 'https'
fs = require 'fs'
xml2js = require 'xml2js'
cli = require 'cli'

util = require 'util'

base64DecodeAll = (x) ->
    return unless x instanceof Object
    for name, value of x
        if name == 'Label'
            x[name] = (new Buffer value, 'base64').toString()
        else
            base64DecodeAll x[name]
    return

class ServiceManagementApi
    constructor: (@subscriptionId, @key, @cert) ->

    getOperatingSystemFamilies: (callback) ->
        this.call 'operatingsystemfamilies', 'GET', callback

    call: (path, method, body, callback) ->
        if not callback?
            if not body?
                callback = method
                method = 'GET'
                body = undefined
            else
                callback = body
                body = undefined
        options = {
            host: 'management.core.windows.net',
            port: 443,
            key: @key,
            cert: @cert,
            method: method,
            headers: { 'x-ms-version': '2010-10-28' },
            path: "/#{@subscriptionId}/#{path}"
        }
        req = https.request options, (res) ->
                body = ''
                res.on 'data', (chunk) -> body += chunk
                res.on 'end', (result) ->
                    parser = new xml2js.Parser
                    parser.on 'end', (result) ->
                        base64DecodeAll result
                        for name, value of result
                            callback value unless name == '@'
                        return
                    parser.parseString body
                    return
        req.write body if body?
        req.end()
        return

options = cli.parse {
    subscriptionId: ['s', 'Subscription ID (found in the Windows Azure portal)', 'string'],
    privateKey: ['p', 'Private key (.pem file)', 'file', 'priv.pem'],
    certificate: ['c', 'Public certificate (.pem file)', 'file', 'pub.pem']
}
new ServiceManagementApi options.subscriptionId,
    fs.readFileSync(options.privateKey, 'ascii'),
    fs.readFileSync(options.certificate, 'ascii')
.getOperatingSystemFamilies (result) ->
    console.log util.inspect result, false, 10