How to use SSO (Discourse on subdomain)

installation
1

Hello

Many time to read topics, but I cannot undestand how to do.
Maybe you can help me ?

We installed a Discourse forum on OVH VPS, subdomain of our site (forum.mysite.com)

Old users will be imported into Discourse Forum.
New users will create account by Discourse Forum.
All users will sign on with Discourse.
OK

Our main site (www.mysite.com) is PHP/MySQL.
My php pages have to know if the user is logged, his username, his group.
How to do ?
I can create PHP scripts, but I don’t know Ruby.

Maybe read session (cookie) ?

I found this but cannot find what to do with :
https://gist.github.com/paxmanchris/e93018a3e8fbdfced039

Your help is welcome.
Discourse is new for me…

Many thanks

2

SSO provider feature is inbuilt in Discourse core. So you don’t have to worry about it. Follow this #howto Using Discourse as an identity provider (SSO, DiscourseConnect).

In this line you will receive logged-in user details if you configured everything (php code + settings) correctly.

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3

OK thanks.

I see it’s the solution, but I don’t andertand howto use.

The way with this script :
1/ On external site, user click the link <a href='$discourse_url/session/sso_provider?$query'>sign in with discourse</a>
2/ Discourse returns user info
3/ external site open a session ?

I’m ok or not ?

I’m not far, but have not yet all keys…
Migration stopped until I anderstand how to use the script…
Many thanks !

4

Here external site received successful logged-in user details. Yes you can start a session.

It is just a placeholder. You have to replace your own code to create a new session in your website.

Also since the script you referred is not official I don’t know whether it is valid working one or not.

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5

It’s more clearn now for me.

I read this several times and then try to do this

Thanks for helping

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6

Last question please about get_key() and set_key() functions

// pretend that set_key is a function that saves key value data in a database

Initially we store the nonce in a database (a single column table ?)
When Discourse respond, we just check if nonce exists in the table ?
If yes, we store login infos received from Discourse with the $_GET
(then store in PHP session…)

Is it ok ?

7

I just create a table with column “nonce”, and it’s ok.

Now I have to purge the table to delete old nonce, I have to set session variables, and all is ok.

Thanks again

8

I think you don’t need to store your nonce in db. It is not like an API key.

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9

Only in a session variable, so I can check it with value sent by Discourse ?

10

Yes. anywhere temporarily.

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11

I misread what is being done here. To use Discourse as the SSO provider, the nonce will have to be stored somewhere on the website. The wp-discourse plugin does it by saving the value to the database.

13

Yes. @Jean-Michel25 you can use either way which is easier to you.

4 Likes
14

Hello

I wanted to confirm, for further readers.

I use sessions variables for storing the nonce and then compare it with the string returned by sso server.
All of this works nice.

Thanks for the help !

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