Monday, July 1, 2013

Small script for one of the plarium game

few notes about google games.
Goggle informed that access to the all games be closed after June, 30. I played "Pirates: Tides of fortune" and decided to limit my game time using small script. Detail is below.
Some history
First internet games were updated network games only. 15 years ago internet connection requires a lot of money and nobody had a problem with lagging of the other players. Usually games uses personal communication protocol. Warbirds, Aces High and Eve online use this way.
Next part use a browser and trivial HTTP protocol. One of the popular game in this area is travian . Travian player uses browser and every browser (PC, cell phone, tablet) can be used for playing. Of course, popularity of the game is related to graphics. Trivial HTTP does not have good power in this and other technology is used for this side. One of them is Flash . Unfortunately flash requires a lot of CPU : "Pirates" was near to froze at my old celeron with 512MB. I hope next generation of browser's games will user WebGL.
Modern HTTP games uses AJAX for sending data from client's application to the server. This one way decreases load at server side and increases client responses. I started to run ngrep session (ngrep is included in the most of linux distro) and capture some data from client to server and back:
POST /PiratesGp/Segment01/segment.ashx HTTP/1.1.
Connection: keep-alive.
Content-Length: 158.
sign-code: d92d1d781e82623efc9125a18994876c.
signin-userid: gpxxxxxxxxxxxxxxxxxxxxxxxxx
server-method: AutoRefresh.
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36.
client-ver: 405.
signin-authseed: fxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
signin-authkey: fxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
locale-name: en-US.
content-type: text/html.
Accept: */*.
Accept-Encoding: gzip,deflate,sdch.
Accept-Language: en-US,en;q=0.8.

Look like games uses Google OAuth but I'm not sure. Anyway only next variables is important for developing bot: sign-code, signin-userid, signin-authseed, signin-authkey. Last three header fields are related to authorization. First variable ( sign-code) is interested. This one is used for security reason and is equal to md5sum from body and secret string. Body is JSON converted to string. Final python function is calculated as:
def generateRequestSignature(str1, str2):
    ''' Generate request signature  from '''
    return  hashlib.md5(("The Matrix has you..."+ str1+ str2).encode('ascii')).hexdigest()

After this trivial and long work should be done related to the client command. Each command should be investigated and added to the script. In the answer above "t" is a Unix time , "u" time from last login, "g" command id, "q" island position on the global map.
After this we can create a simple class for this game:
class PiratesClient:
    ''' Main class for generating daemon'''
    def __init__(self, profile): 
        ''' Constructor of the client. Set values of the headers and defaults paramaters fields.  
            Accept authSeed, authKey, userId, commandid, and user delta'''
        self.headers = { 
            "User-Agent": "Mozilla/5.0 (X11; Linux i686; rv:10.0.5) Gecko/20100101 Firefox/10.0.5 Iceweasel/10.0.5",
            "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", 
            "Accept-Language": "uk,ru;q=0.8,en-us;q=0.5,en;q=0.3",
            "Accept-Encoding": "gzip",
            "DNT": "1",
            "Connection": "keep-alive",
            "Content-Type": "text/html",
            "locale-name": "en-US"
        # read config file 
        # system configuration
        self.config  = configparser.RawConfigParser()'pirates.ini','UTF-8')

        # user configuration (dynamic create if not exists)
        self.config_user  = configparser.RawConfigParser()
        if os.path.exists('pirates_'+str(profile.my_uid)+'.ini'):
            with open('pirates_'+str(profile.my_uid)+'.ini', 'w') as configfile:
                self.config_user.set('client', 'commandid', "12345")            

        self.profile = profile
        self.commandId = int(self.config_user['client']['commandid'])
        self.version = int(self.config['game']['version'])
        self.headers["client-ver"] = self.version
        self.headers["signin-authSeed"] = profile.authSeed
        self.headers["signin-authKey"] = profile.authKey
        self.headers["signin-userId"] = profile.userId

        self.userdelta = 45678
        self.userId = profile.userId
        self.authKey = profile.authKey
        self.piratesurl = SERVER_IP
        self.userQ = profile.userQ
        self.userSegment = profile.userSegment
        self.params = {"q": self.userQ, "r":self.commandId, "v": self.version}
        self.connection = http.client.HTTPConnection(self.piratesurl)
        self.cachedUserRefresh = None

and creating gear at the heaven :
    def StartConversionJob(self):
        """  function for convert lumber and gold to gear (1 h for now)"""
        requesttime = round(time.time()*1000)
        new_g_value = round(requesttime-self.userdelta)

        data = [{ # user ID list
            "o":{"f":1, "i":3},

I think that creating other function is not so hard task. command
 ngrep -W byline -d eth0 host
helps to retrieve information. I have not made any changes at the client or server sides of this application. Simple result
Most of the function is already done. It is not a hard task but requires a lot of time. If you would like to create a similar game by yourself you can try. Server for this kind of game is priced under 20 $/month. (Original server uses Windows Vista Home edition, look like virtual host). Other is your time and initiative. You need some painter and musics skills fro creating frontend and some skill fro backend. Also I would like to say that game programming it is not gold mine , but you success in your hands. If anybody interested I can add few articles about creating this kind of games by using modern framework

I've add  few articles about investigating flash  games . First part is