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Can I pass Wordpress URL parameters to identify a user?

Hey Experts!!

Site A = Microsoft Azure platform
Site W = Wordpress platform

I have a bit of a dilemma. I have 2 sites, Site A and Site W. Site A is where all of my customer data is stored. Site W is where they will be purchasing products.
I control NOTHING on Site A, but have full control of Site W.  

My question is this:
If Site A can pass me URL variables, can I identify and possibly login users on my Wordpress site(Site W)?  I realize I may have to keep the user data in 2 separate places, but I'll have to tackle this later.  For now I just need to know if and how I can do this.
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LZ1
Asked:
LZ1
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1 Solution
 
Ishaan RawatDesigner | Developer | ProgrammerCommented:
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LZ1Author Commented:
I read the codex, however I don't want to update a user. Unless I misread, it seems I can only update their account.  Rather take them to a product page or at least their account page.
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Jason C. LevineNo oneCommented:
Surprisingly, WordPress is pretty weak on SSO and passthrough login solutions. The closest/best plugin to look into at this time is Keyring:

http://wordpress.org/plugins/keyring/

Alternately, you can bypass the wp-users table for an external database:

http://wordpress.org/plugins/external-db-auth-reloaded/

I have implemented something similar to the above plugin (also using the original external-db-auth abandoned plugin as the base) and it works very well.
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LZ1Author Commented:
Thanks Jason, I'll definitely look into those.

Along the same note though, would there be a better way of going about all of this? Obviously besides having the same platform on the same domain for everything.
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Jason C. LevineNo oneCommented:
There really isn't.  Your problem is a fundamental one: the data isn't where it needs to be and you don't have enough control to implement a more granular solution.  So a login token or external authentication are your only choices.
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LZ1Author Commented:
So where can I learn more about actually doing it? I've never done anything this "heavy".  Any tutorials or good articles you could recommend?

After that I'll close the question and then ask more specific questions as they come up.
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Jason C. LevineNo oneCommented:
This isn't quite as difficult as it sounds.  You need to be able to generate a token on site A that contains the user's information, encrypted, and create a URL that has the encrypted text as the query string.  On site B, you decrypt the information and do something with it that makes life easier for the user.

The headache is that you won't have a matching user account on Site B unless you are doing something else that synchronizes the two databases.  Worse, you probably won't have a plain-text password from the Azure site to import to WordPress.  This is why I think you should look into the external DB plugins and not login tokens...it's easier.

One thing you COULD do with the token method is pass the user information through wp_create_user()  and basically auto-create an account for users the first time they cross over.  If the account already exists, you would redirect them to the login page and autopopulate the username.
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LZ1Author Commented:
Thanks for all the info Jason. I haven't done anything like that yet of course. But I'll be looking into it this week.

Stay tuned, I'm sure this will be a lot of fun. Thanks again.
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