Latest News

Wednesday 23 December 2009

Dummies Guide to GWT and OpenID - with example code

Once (?) in awhile, we developers browse the web for some quick and dirty solutions to some of our coding problems (sometimes not even problems, right?). This is another of those days, everything was going fine on this project I am currently working on. This is not a social networking sites but a site for sharing and comunicating (how I missed the days of the chatrooms) similar in many aspect to Digg and DZone but which also allows users to communicate in realtime and leave comments. So the back-end was sort of completed but so now time to focus on the user registration.

The sites needed to be open and avoid repeatitive tasks such registering users. The way forward was to implement some authentication to allow users to register with some sort of universally accessible ID (or sort of). Facebook Connect, OpenSocial and Google Accounts have their advantages but to me personally; the disadvantages outweight the pros. These are some of the disadvantages of those platform:

  1. Facebook is a popular site hence is its platform, Facebook Connect, in mostly Europe and America but not everybody in Europe and America have a Facebook account.
  2. OpenSocial, when it comes to single logon, has more advantages than Facebook. I supposed that if we do take into consideration all the OpenSocial sites, we might have apossible larger user based than supporting Facebook alone. Even that was too limited.
  3. Google Accounts, one thing Google does not advertise its user base. I could be wrong but do anybody actually knows how many people uses the various Google services (excluding search). Google has the same disadvantages as Facebook.

Enter OpenID. OpenID has been around longer than most Internet-based decentralised authentication platform. The beauty of this platform is that it also supported by most (if not all) large site on the Internet. From AOL, BBC, CNN to YAHOO and ZIMBRA, as I said most sites (based on the alphabet) support OpenID, check the OpenID Directory. It was recently announced that OpenID has reached 1Billion enabled accounts (read here). Based on those figures, I decided that OpenID for now was the authentication choice for this application. I will not be discussing any security issues in this entry, there are plenty of resources available on the Internet for that.

OK, so I am a Java developer and I am developing the front-end using GWT and Java on the server-side. I searched on the Internet for solutions on how to implement the authentication as GWT RPC are different to normal servlet call. I spent more time reading about the OpenID specification and implementations examples on the Internet. I have to admit that some of tutorials that I found on the Internet were somehow confusing and not helpful at all. Therefore I decided to write my own Dummies Guide to GWT and OpenID.

Dummies Guide to GWT and OpenID

First of all, it is important to know how OpenID works (please check the OpenID site for more info).

In a nutshell, OpenID allows you to authenticate with website (supporting the standard) with just an URL and voila. Your URL has to be hosted by an OpenID provider in order for it to work. For example, my blog is hosted by Google on blogspot.com. Google supports OpenID authentication therefore if a reader wanted to leave a comment on my blog, he does not have to have a Google Account as he can log-in with his Yahoo or AOL or Facebook or Wordpress or any other OpenID provider sites, and then leave a comment, that simple.

GWT to OpenID and back

There are two ways to authenticate a user with an OpenID provider and GWT supports both. When authenticating a user, the relaying site (the site the user is trying to access) redirects to user to the OpenID provider (i.e. Google) login page.


The problem will be with the GWT RPC mechanism. GWT RPC calls are asynchronous and you cannot make any redirections. Therefore we need a way to execute the redirection from the client side, here is the code (I use OpenID for Java to handle the openID discovery from the RPC servlet), I then used USER object (just a simple POJO which only stores the redirection URL and the parameters) to be sent back and forth between the front-end and back-end.

#######################################################
public User authenticateOpenId(String provider_url) {
    try {
        ConsumerManager manager = new ConsumerManager();
        // This is the URL where the OpenID provider will redirect the user
        // once logged in.
        String returnToUrl = "http://localhost:8084/GwtOpenId";
       
        // the provider URL will be used to identify the user OpenID provider
        List discoveries = manager.discover(provider_url);
        DiscoveryInformation discovered = manager.associate(discoveries);
        // OpenID 4 Java needs to  have an HttpServletRequest object, GWT sevlet 

have
        // convenient methods to retrieve the HttpServletRequest object 

and manipulate its
        // parameters
        this.getThreadLocalRequest().setAttribute("openid-disc", discovered);
        this.getThreadLocalRequest().setAttribute("openid.mode", "popup");
       
        AuthRequest authReq = manager.authenticate(discovered, returnToUrl);
        FetchRequest fetch = FetchRequest.createFetchRequest();
        // I want to exchange the following attributes from the OpenID provider
        // remember that teh attribute will be returned only if it exits
        fetch.addAttribute("email","http://schema.openid.net/contact/email",true);
        authReq.addExtension(fetch);
        // Simple POJO to persist the data
        User user = new User();
        // In a normal servlet development, the following statement would make
        // a redirect call but this would not work when using GWT RPC
        if(!discovered.isVersion2()){
            user.setRedirect(authReq.getDestinationUrl(true));
            // fakes the redirect by sending the POJO with the required parameters
            // to make a client-side redirect
            return user;
            } else{
            user.setParams(authReq.getParameterMap());
            user.setRedirect(authReq.getDestinationUrl(false));
            // fakes the redirect by sending the POJO with the required parameters
            // to make a client-side redirect
            return user;
        }
        } catch (MessageException ex) {
        Logger.getLogger(GWTServiceImpl.class.getName()).log(Level.SEVERE, null, ex);
        return null;
        } catch (DiscoveryException ex) {
        Logger.getLogger(GWTServiceImpl.class.getName()).log(Level.SEVERE, null, ex);
        return null;
        } catch (ConsumerException ex) {
        Logger.getLogger(GWTServiceImpl.class.getName()).log(Level.SEVERE, null, ex);
        return null;
    }
}

#############################################################

The above codes will format the request in order for the front-end to execute a redirect and allow the user to authenticate with his OpenID provider. Now here is the front-end code which executes the authentication and reads the data back.


#################################################################
// This is an extract from the openidEntryPoint.java

// This is where the magic happens - This code is only usefull when the OpenID 

provider
// redirects the user back to your site - please visit openid.net for valid 

parameters.
// The "if" statement checks to make sure that it is a valid response from 

the OpenID
// provider - You can do anything you want with the results here such 

as verifying the
// response with the server-side code
if(Window.Location.getParameter("openid.rpnonce") != null){
    String s = Window.Location.getParameter("openid.mode");
    // executes this if the user cancels the authentication process and the OpenID
    // providers returns to the your site
    if(s.equals("cancel")){
        sign.setText("Server returned openid.mode=cancel");
        openIdUrl.setText("You need to Accept not Cancel");
    }
    // Here, I am assuming that everything is fine and that the user has 

been sucessfully logged in
    else{
        sign.setText("You have successfully signed in");
        vp.setVisible(false);
    }
   
}
RootPanel.get().add(contentPanel);

}

private class UserAsyncCallback implements AsyncCallback<User> {
   
    public void onFailure(Throwable caught) {
        Window.alert(caught.getLocalizedMessage());
    }
   
    public void onSuccess(User result) {
        if (result != null) {
            //                    Window.open(result.getRedirect(), "_blank",

 "height=200,width=400,left=100," +
            //                            "top=100,resizable=no,scrollbars=no,

toolbar=no,status=yes");
            // this the most important line in order to make the authentication.

 Here, I am redirecting the user
            // from the client side to the OpenID provider URL with the discovery

 data generated from the
            // RPC call to the servlet.
            Window.Location.assign(result.getRedirect());
            } else {
            Window.alert("Ooops!!! Couldn't find your provider");
        }
    }
}
#######################################################################################################

I have attached the full NetBeans project with dependencies. The code is provided as-is and use at your own risk ;). Here is a screenshot of the working application:

Step1: Authenticate on the site (enter the URL)
moz-screenshot-6

Step2: Redirect to OpenID provider (Google is my provider :) ), authenticate with your provider
moz-screenshot-7

Step3: Allow the application to access your OpenID details and redirect back to the original site
moz-screenshot-8


Step4: final step, check the parameters from the provider and proceeds accordingly
moz-screenshot-9


Take a look at the URL in each of the above step to see the OpenID data. OK, so my code actually works (yuppie), now you know that it is possible form GWT to OpenID and it's not as complicated as many other sites are trying to show. The code is just for authentication but once authenticated, you can retrieve any parameters that you need. In this example, the query is sent through the browser URL (GET) but you can change it to be encoded in a form submit action. Iwrote some of the code to allow the user to authenticate via a popup window, the code is not complete and maybe someone else might want to have a go. My only problem is getting the redirect back to the original window but apart from that it works.

Download the source code

I hope you guys enjoyed it and Happy Coding.




  • Blogger Comments
  • Facebook Comments

213 comments :

  1. Hi Armel

    This is a very good start - but I think the example is incomplete (or it may be that I don't understand what you have done).

    The problem is the parameters coming back from the OpenID provider need to be verified. Otherwise anyone could just perform a GET with the right parameters and be "authenticated" without actually going through the openid provider.

    The verification needs to be done via a call to the openid4java library. So you either need to compile this client side (a tricky proposition -I don't think the GWT compiler would convert all of the openid4java library to javascript) - or you have to perform the work on the server side.

    I think you could extend the example to have the client call back to another server side function that does the verification. The same consumer manager used to create the request has to verify it.

    I am working on getting this going - so I will ping you if I get it working.

    ReplyDelete
  2. @wstrange the code that I wrote was actually adapted from the openid4java example (http://code.google.com/p/openid4java/wiki/SampleConsumer) and if you take a look at the second method, it that part that verifies the authentication. This is not the hardest part so I believe to covered the most important aspect. You can make the ConsumerManager to be a singleton as that it will be the same object that has generated the initial provider and then verifies it. You can also store it the object if you do not want it as a singleton so that you cache the object for later retrieval. Let me know if you need more clarification on the subject.

    Thanks for the comment.

    ReplyDelete
  3. Hi Armel

    The openid4java SampleConsumer example uses a session variable to store the discovery information used to generate the request. This discovery state is unique for each web client and must be used to validate the response.

    In your example above you are using thread local storage (not a session variable) and you don't appear to be calling the manager.verify() method to verify that the response from the OP is valid. The parameters passed back in the redirect must be verified (you can't just extract them from the URL and assume they are valid - this can be spoofed). I can't see where your code is doing the verification.

    I don't believe making the consumer manger a singleton is doing what you think it is. It's the discovery information that is generated by the manager that needs to be stored per client instance:
    DiscoveryInformation discovered = manager.associate(discoveries);

    and then retrieved from the session (or other mechanism) to perform validation on the parameters coming back from the OP:

    DiscoveryInformation discovered = (DiscoveryInformation)
    httpReq.getSession().getAttribute("openid-disc");

    VerificationResult verification = manager.verify(
    receivingURL.toString(),
    response, discovered);

    I think your example "works" in the sense that it lets someone logon. But if you are blinding trusting the URL parameters this is not secure.

    Warren

    ReplyDelete
  4. Hi Warren,

    You are right as stated in the blog article, I was just demonstrating how to implement a OpenID using GWT as they were interest about it in forums. As soon as I have sometimes to focus on this article, I will extend it to implement the verification. Off-my head, I supposed you can save the instance in some sort of caching and use a unique identifier key to retrieve the value when you need it. You should also think about putting an expiry on the cache for security reasons.

    Also, if anybody has already implemented the verification process using GWT as above, please do share it.

    Armel

    ReplyDelete
  5. Hi Armel, I have written a post about my implementation of your code into grails / GWT and adding server-side verification of the OpenId response through service-side session storage.

    Take a look at:

    http://code-omen.blogspot.com/2010/10/dum-guide-to-openid-gwt-and-grails.html

    ReplyDelete
  6. Hi Armel,

    I am using GWT/GAE with the jar - openid4java-gaehacks-0.9.5-593.jar

    I get the following:

    With https://me.yahoo.com, the response is

    Sorry! You will not be able to link your Yahoo! account with this website or application. It is using an older version of the OpenID technology.

    With https://www.google.com/accounts/o8/id, the response is

    The page you requested is invalid.

    Any help ?

    ReplyDelete
    Replies
    1. Try changing:

      user.setRedirect(authReq.getDestinationUrl(false));

      to

      user.setRedirect(authReq.getDestinationUrl(TRUE));

      in authenticateOpenId(String provider_url) method when discovered is version2.

      Delete
    2. I've been struggling for like 2 weeks to make this work with openid4java-gaehacks-0.9.5 thinking it was because the version of the library. Tried to mix up some things of the newest version (0.96), built with ant and still didn't work. I was almost going to give up.

      Suddenly, today, when I was about to surrender, I get to see your bless reply. I have no words to describe my thankfulness to you. Just thank you SO MUCH.

      Delete
  7. I too want to add OpenId login support to my GWT app. This was originally posted Dec 2009, based on the comments it seems the code was almost working? Did you ever get it finished? Is the redirect back to original window working? If you have some updated code could you update the post or send to me dhoffer6 at gmail dot com, many thanks!

    ReplyDelete
  8. I am so happy after read your blog. It’s very useful blog for us.

    Java Corporate training for employees in Nigeria

    ReplyDelete
  9. Thanks for sharing this valuable information and we collected some information from this blog.

    In house Management training

    ReplyDelete
  10. Hello everyone, Are you into trading or just wish to give it a try, please becareful on the platform you choose to invest on and the manager you choose to manage your account because that’s where failure starts from be wise. After reading so much comment i had to give trading tips a try, I have to come to the conclusion that binary options pays massively but the masses has refused to show us the right way to earn That’s why I have to give trading tips the accolades because they have been so helpful to traders . For a free masterclass strategy kindly contact (paytondyian699@gmail.com) for a free masterclass strategy. He'll give you a free tutors on how you can earn and recover your losses in trading for free..

    ReplyDelete
  11. I was surfing net and fortunately came across this site and found very interesting stuff here. Its really fun to read. I enjoyed a lot. Thanks for sharing this wonderful information. buku mimpi 3d

    ReplyDelete
  12. We are really grateful for your blog post. You will find a lot of approaches after visiting your post. Great work iphonewiz

    ReplyDelete
  13. I conceive you have noted some very interesting points, regards for the post.
    ทางเข้าเว็บพนันW88

    ReplyDelete
  14. Wohh just what I was looking for, regards for posting.
    รีวิวUFASLOT

    ReplyDelete
  15. I am thankful to you for sharing this plethora of useful information. I found this resource utmost beneficial for me. Thanks a lot for hard work.
    คาสิโนออนไลน์UFABET
    เว็บพนันออนไลน์ufacasino
    คาสิโนออนไลน์ที่ดีที่สุด

    ReplyDelete
  16. I am thankful to you for sharing this plethora of useful information. I found this resource utmost beneficial for me. Thanks a lot for hard work.
    SA Gaming
    SA Gaming Casino

    ReplyDelete
  17. I read this article. I think You put a lot of effort to create this article. I appreciate your work. venus casino online . เดิมพันออนไลน์Venus Casino . แนะนำเว็บVenus Casino

    ReplyDelete
  18. Wohh just what I was looking for, regards for posting. คาสิโนเว็บUFABET

    ReplyDelete
  19. Photos available on your site even though producing attention rapidly some quantity submits. เล่นเสือมังกรบนมือถือ

    ReplyDelete
  20. I read this article. I think You put a lot of effort to create this article. I appreciate your work. เสือมังกรออนไลน์

    ReplyDelete
  21. I am thankful to you for sharing this plethora of useful information. I found this resource utmost beneficial for me. Thanks a lot for hard work. Sexy Baccarat

    ReplyDelete
  22. Here at this site really the fastidious material collection so that everybody can enjoy a lot. 交友網

    ReplyDelete
  23. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. เดิมพันออนไลน์Venus Casino

    ReplyDelete
  24. This comment has been removed by the author.

    ReplyDelete
  25. I curious more interest in some of them hope you will give more information on this topics in your next articles. Best Infinix S5 Pro Mobile Phone Price in GERMANY

    ReplyDelete
  26. Photos available on your site even though producing attention rapidly some quantity submits. ยูฟ่าเบท . เว็บพนันufabet

    ReplyDelete
  27. I am thankful to you for sharing this plethora of useful information. I found this resource utmost beneficial for me. Thanks a lot for hard work. รีวิวเว็บพนันUFABET

    ReplyDelete
  28. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also UFA GAME UFA CASINO

    ReplyDelete
  29. I read this article. I think You put a lot of effort to create this article. I appreciate your work.วิธีเล่นufaslot.สมัครสมาชิกยูฟ่าสล็อต

    ReplyDelete
  30. I read this article. I think You put a lot of effort to create this article. I appreciate your work. UFA SLOT ยูฟ่าสล็อต

    ReplyDelete
  31. Photos available on your site even though producing attention rapidly some quantity submits. เกมยิงปลา . เกมยิงปลาแตกง่าย

    ReplyDelete
  32. I read this article. I think You put a lot of effort to create this article. I appreciate your work. เดิมพันคาสิโนยูฟ่าเบท คาสิโนยูฟ่าเบท2021

    ReplyDelete
  33. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also ยูฟ่าเบทขั้นต่ำ10บาท

    ReplyDelete
  34. I value the article.Thanks Again. Much obliged. Sexy gaming

    ReplyDelete
  35. I value the article.Thanks Again. Much obliged. คาสิโน AE Sexy . . sexybaccarat365s.com .

    ReplyDelete
  36. I read this article. I think You put a lot of effort to create this article. I appreciate your work.
    เดิมพันคาสิโนSexy.
    sexybaccarat365s.com.

    ReplyDelete
  37. I will bookmark your site and take the feeds additionally.แนะนำเว็บยูฟ่าเบท

    ReplyDelete
  38. I conceive you have noted some very interesting points, regards for the post. ยูฟ่าเบท.

    ReplyDelete
  39. I conceive you have noted some very interesting points, regards for the post.
    เล่นKingmakerบนมือถือ

    ReplyDelete
  40. Wohh just what I was looking for, regards for posting.
    ไฮโลKingmaker

    ReplyDelete
  41. We provide best services to all class of clients. สล็อตKingmaker

    ReplyDelete
  42. Photos available on your site even though producing attention rapidly some quantity submits. แนะนำเว็บบอลUfabet.

    ReplyDelete
  43. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also คาสิโนออนไลน์ยูฟ่าเบท

    ReplyDelete
  44. I conceive you have noted some very interesting points, regards for the post. SlotUfabet

    ReplyDelete
  45. I am thankful to you for sharing this plethora of useful information. I found this resource utmost beneficial for me. Thanks a lot for hard work. เล่นสล็อตบนมือถือ

    ReplyDelete
  46. I conceive you have noted some very interesting points, regards for the post. ยูฟ่าเบทคาสิโนออนไลน์

    ReplyDelete
  47. Photos available on your site even though producing attention rapidly some quantity submits. คาสิโนออนไลน์.

    ReplyDelete
  48. I will bookmark your site and take the feeds additionally Casino UFABET

    ReplyDelete
  49. Photos available on your site even though producing attention rapidly some quantity submits. คาสิโนขั้นต่ำ10บาท.

    ReplyDelete
  50. I read this article. I think You put a lot of effort to create this article. I appreciate your work.คาสิโนUfabet

    ReplyDelete
  51. I value the article.Thanks Again. Much obliged. Sexy Baccarat

    ReplyDelete
  52. Wohh just what I was looking for, regards for posting.Sexy Baccarat

    ReplyDelete
  53. Photos available on your site even though producing attention rapidly some quantity submits.สมัครเล่นยูฟ่าเบท

    ReplyDelete
  54. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. บาคาร่าออนไลน์

    ReplyDelete
  55. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. เดิมพันบาคาร่าออนไลน์ . เดิมพันบาคาร่ายูฟ่าเบท .

    ReplyDelete
  56. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. ทางเข้าUFABET.

    ReplyDelete
  57. I conceive you have noted some very interesting points, regards for the post. รูเล็ตออนไลน์

    ReplyDelete
  58. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. หวยยูฟ่าเบท .

    ReplyDelete
  59. Wohh just what I was looking for, regards for posting. แทงบาคาร่า

    ReplyDelete
  60. I read this article. I think You put a lot of effort to create this article. I appreciate your work. เล่นคาสิโนสดบาคาร่า.

    ReplyDelete
  61. I conceive you have noted some very interesting points, regards for the post.พีจีสล็อต

    ReplyDelete
  62. We provide best services to all class of clients. PGSLOT GAME

    ReplyDelete
  63. Wohh just what I was looking for, regards for posting.
    Sicbo online

    ReplyDelete
  64. I conceive you have noted some very interesting points, regards for the post. Slot PG .

    ReplyDelete
  65. Photos available on your site even though producing attention rapidly some quantity submits. พีจีสล็อต.

    ReplyDelete
  66. I went to this website, and I believe that you have a plenty of excellent information, I have saved your site to my bookmarks. แทงไฮโลออนไลน์

    ReplyDelete
  67. I will bookmark your site and take the feeds additionally.UFABET

    ReplyDelete
  68. Wohh just what I was looking for, regards for posting. Red Tigerบนมือถือ

    ReplyDelete
  69. Wohh just what I was looking for, regards for posting.casino Red Tiger

    ReplyDelete
  70. I conceive you have noted some very interesting points, regards for the post.เล่นเสือมังกรออนไลน์

    ReplyDelete
  71. I conceive you have noted some very interesting points, regards for the post . Joker Gaming

    ReplyDelete
  72. I read this article. I think You put a lot of effort to create this article. I appreciate your work.
    Spade gaming Slot Online

    ReplyDelete
  73. I value the article.Thanks Again. Much obliged. แทงหวยออนไลน์

    ReplyDelete
  74. We provide best services to all class of clients. แทงบอลเต็งUFABET

    ReplyDelete
  75. We provide best services to all class of clients.
    สมัครUFABET

    ReplyDelete
  76. I will bookmark your site and take the feeds additionally. UFAslot (ยูฟ่าสล็อต).

    ReplyDelete
  77. I conceive you have noted some very interesting points, regards for the post. UFAslot (ยูฟ่าสล็อต)

    ReplyDelete
  78. I am thankful to you for sharing this plethora of useful information. I found this resource utmost beneficial for me. Thanks a lot for hard work. ไฮโลออนไลน์บนมือถือ.

    ReplyDelete
  79. I conceive you have noted some very interesting points, regards for the post. ทางเข้าแทงไฮโลออนไลน์

    ReplyDelete
  80. I read this article. I think You put a lot of effort to create this article. I appreciate your work.เดิมพันไฮโลออนไลน์

    ReplyDelete
  81. I will bookmark your site and take the feeds additionally.Roulette online

    ReplyDelete
  82. Wohh just what I was looking for, regards for posting.
    ไพ่เสือมังกร

    ReplyDelete
  83. I conceive you have noted some very interesting points, regards for the post. สมัครสมาชิกufabet

    ReplyDelete
  84. I conceive you have noted some very interesting points, regards for the post.
    เคล็ดลับสล็อตออนไลน์

    ReplyDelete
  85. We help them as much as we can. If they need assistance with research, writing, grammar, formatting or proofreading, we provide our assistance to help them build their career. แทงบอล . แทงบอลออนไลน์ยูฟ่าเบท . แทงบอลออนไลน์บนมือถือ

    ReplyDelete
  86. I conceive you have noted some very interesting points, regards for the post. เว็บเล่นบาคาร่าอันดับ 1

    ReplyDelete
  87. Photos available on your site even though producing attention rapidly some quantity submits.ไฮโลออนไลน์

    ReplyDelete
  88. Wohh just what I was looking for, regards for posting. สมัครUFABET.

    ReplyDelete
  89. Awesome and interesting article. Great things you’ve always shared with us. Thanks. Just continue composing this kind of post. สมัครเล่นป๊อกเด้งขั่นต่ำ 100 บาท

    ReplyDelete
  90. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. สล็อตออนไลน์ขั้นต่ำ1บาท

    ReplyDelete
  91. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also.เว็บUFACASINO

    ReplyDelete
  92. We provide best services to all class of clients. รีวิวUFASLOT

    ReplyDelete
  93. "***I wanted to thank you for this excellent read!! I definitely loved every little
    bit of it."
    แทงบอลออนไลน์
    แทงบอล

    ReplyDelete
  94. I conceive you have noted some very interesting points, regards for the post.
    บอลพรีเมียร์ลีก

    ReplyDelete
  95. Wow! This is the best information I have ever read and I hope to get new knowledge from this blog again. เกมสล็อตออนไลน์ที่ดีที่สุด

    ReplyDelete
  96. We provide best services to all class of clients.
    slot online

    ReplyDelete
  97. I am so happy after read your blog. It’s very useful blog for us. tank you so mush. แทงบอล คาสิโน

    ReplyDelete
  98. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. เว็บพนันออนไลน์UFABETดีมั้ย

    ReplyDelete
  99. Thanks for sharing such a wonderful post เว็บบอล

    ReplyDelete
  100. I have read your article couple of times because your views are on my own for the most part. It is great content for every reader. สมัครUFABETฝากขั้นต่ำ100 สมัครUFABETเว็บคาสิโนออนไลน์

    ReplyDelete
  101. I went to this website, and I believe that you have a plenty of excellent information, I have saved your site to my bookmarks. เว็บคาสิโนUFABET

    ReplyDelete
  102. I conceive you have noted some very interesting points, regards for the post. เว็บรวมคาสิโน

    ReplyDelete
  103. This is very Amazing and Very Informative Artical we get alot of Informations from this artical
    we really appreciate your team work keep it up and keep posting such a informative articles.
    Thank you.


    แทงบอลสด

    ReplyDelete

  104. Thank you for sharing this valuable information with us keep sharing.
    ไฮโลออนไลน์

    ReplyDelete
  105. I went to this website, and I believe that you have a plenty of excellent information, I have saved your site to my bookmarks. เล่นเกมไพ่ป๊อกเด้ง

    ReplyDelete
  106. The blog was very innovative. This will be stylish and creative.


    วิธีทำเงินUFABET

    ReplyDelete
  107. Thank you for the wonderful information. this article is really helpful. I have been searching for this article for long time.
    เว็บแทงบอลออนไลน์ท่ดีที่สุด

    ReplyDelete
  108. This article is good, interesting and informative.
    ช่วงเวลาเล่นสล็อตpg

    ReplyDelete
  109. This is a great web site, Good sparkling user interface and, very informative blogs. thanks. You may check our website also. ทางเข้าเล่นยูฟ่าสล็อตบนมือถือ

    ReplyDelete
  110. I read this article. I think You put a lot of effort to create this article. I appreciate your work.
    ทางเข้าเล่นเกมไพ่ป๊อกเด้ง

    ReplyDelete

Item Reviewed: Dummies Guide to GWT and OpenID - with example code Description: Rating: 5 Reviewed By: Unknown
Scroll to Top