How to login a q2a user from using another domain? (Single Sign-On / Multiple Logins at once)

Question

Situation: 

• Running a q2a forum siteQ.com
• Running a custom website siteB.com with a custom script for user logins. 
• I want to get rid of the custom login script. Instead I would like to use the table "qa_users" from siteQ.com (q2a forum) for the login handling.
• I know already that I can access the q2a db and files from siteB.com via external integration. 

Wanted: 

1. User does his login on siteB.com using table qa_users (works already with external integration)

2. User coming from siteB.com visits siteQ.com which recognizes the user as loggedin.

By the way, you know this login feature from Google and Stackexchange, for instance.

Question: 

How can this be implemented?

.
 

I researched already and found on stackoverflow: 1, 2, 3. But probably there is a simpler way within question2answer.

Comments

I thought I could just do from siteB.com: <form method="post" action="https://siteQ.com/login"> BUT the q2a forum expects the security token.

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Are the 2 domains on the same server?

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Yes, full root access and same database.

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I think the way to achieve this is by using AJAX. I found an example here and will try to test it soon: https://github.com/0k/multidomain-sso

Answer 1

If you do not want to share your DB with the WordPress installation, you can use one more WordPress installation as a single sign-on server.

E.g.

For us,

We have

https://publicityport.com (WordPress)

https://softwaretestingboard.com (WordPress MultiSite)

https://softwaretestingboard.com/qna (Question2Answer)

https://digitalmarketing.q2a.io (Question2Answer)

All four site can connect to one common server, https://myaccount.publicityport.com to get the user authorized.

So, users do not really have to create a separate account for all sites. 

For, WordPress you can create a single sign-on client. And for Q2A, you can use the plugin, https://github.com/PublicityPort/q2a-publicityport-login

Comments

Please don't spam here. It seems you are copying and pasting same content into the site.

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It's not spamming. The answer is relevant to questions asked. If you find it spamming, I apologize for the inconvenience.

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Wordpress was indeed not asked for. That's why Yogendra thinks it is spam. -- Does the plugin above work without dependencies as Single-Sign-On?

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I understand. But, there is nothing wrong to look at the possible solutions. You can simply make SSO out of any other CMS or framework, if not WordPress.

What I tried to convey is that the solution is possible and I just shared what I have.

You are right, the plugin does not work w/o dependency as SSO. But, I think that is the best possible solution we have right now if you want to scale your site.

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...trying to clarify. Apologies if I came out harsh.

I know you've been trying to help the community. However, copying and pasting same content in most of the related questions (maybe) seems spam post. It sometimes irritates to see the same thing all around.

http://www.question2answer.org/qa/53210/how-single-sign-sso-with-wordpress-and-either-phpbb-bbpress

http://www.question2answer.org/qa/25176/how-to-use-question2answer-single-sign-on-for-wordpress-site

http://www.question2answer.org/qa/41988/how-to-create-several-q2a-websites-with-single-sign-on

http://www.question2answer.org/qa/59014/login-user-from-using-another-domain-single-multiple-logins

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Thank you for pointing that out.

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I agree with your point. I have removed my answer or edited wherever it's required.

That's the best I can do :)

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Anyways, thank you for helping the community.