I am trying to authenticate mattermost for my users with keycloak. Now, there is is requirement that signing in to keycloak also has a Wordpress ODIC enabled.
I tried creating a new Identity Provider, but there was no option of Wordpress under social tab. The tab has Github, Gitlab, etc. but I don't need that. So, I selected a more generic option User defined OIDC. And inside that, I entered the following information:
Authorization URL: http://virtual.host/oauth/authorize
Token URL: http://virtual.host/oauth/token
User Info URL: http://virtual.host/oauth/me
Client ID: ****
Client Secret: *****
Client Authentication: 'Client Secret sent as post'
On the Wordpress, I created a client with defaults. For the server, I am using this plugin on Wordpress.
When I process to login to mattermost, I am redirected to keycloak's page. There, I can see an option Login with wordpress. Upon selecting and signing in there, I am redirected back to keycloak. But there, I see the following message:
We are sorry...
Unexpected error when authenticating with identity provider
In the network tab, I get 502 Bad Gateway.
How do I fix this? Or is there something that I am doing wrong. Please help me out. Thanks.