Not able to authenticate CKAN using WSO2 IDM by ckanext-oauth2 plugin - oauth-2.0

Question

I am using CKAN 2.7.2.
I have added the following configurations in my development.ini file of ckan:
ckan.oauth2.authorization_endpoint = https://wso2IP/oauth2/authorize
ckan.oauth2.token_endpoint = https://wso2IP/oauth2/token
ckan.oauth2.profile_api_url = https://wso2IP/userinfo
ckan.oauth2.client_id = *client-id*
ckan.oauth2.client_secret = *clientsecret*
ckan.oauth2.profile_api_user_field = abc
ckan.oauth2.profile_api_mail_field = abc#gmail.com
Also, have exported the following while running ckan using paster serve :
export OAUTHLIB_INSECURE_TRANSPORT=True
Also, I have added an application (ckan provider) in WSO2 Identity Server also with callback URL = (http://ckan-url:5000/oauth2/callback) where the CKAN instance is running (i.e a private IP of 172.30.66.XX type running on port 5000).
So, what configuration need to be done in WSO2 Identity Server and ckan development.ini file?
Also, configuring on both sides, I get the error Client authentication Failed in CKAN GUI.
I am using Ckan 2.7.2 , WSO2-IS 5.1 and ckanext-oauth2 (oauthlib==0.8.0)
will it be giving a problem in authentication process??Can it be a version dependency issue??
I have followed the given steps. Kindly correct if I am missing or doing something wrong:
I have used API store and published ckan application.
Entered the ckan callback url as http://oauth2/callback
Entered the generated client ID and client secret from step 1 in ckan configuration.
Also, made the given changes mentioned by you regarding claim configurations and ckanext-oauth2 configurations.
Now, it gives above error.or sometimes Invalid Client (Client Authentication Failed)
Inbound settings:
enter image description here
Error Logs :
[2018-07-25 19:29:25,432] INFO {org.wso2.carbon.core.services.util.CarbonAuthenticationUtil} - 'admin#carbon.super [-1234]' logged in at [2018-07-25 19:29:25,431+0530]
[2018-07-25 21:55:15,930] INFO {org.wso2.carbon.identity.application.authentication.framework.store.OperationCleanUpService} - Session Operation Data cleanup task is running successfully for removing expired Operation Data
[2018-07-25 23:40:15,929] INFO {org.wso2.carbon.identity.application.authentication.framework.store.SessionCleanUpService} - Session Data cleanup task is running successfully for removing expired Data
[2018-07-26 09:21:18,948] INFO {org.wso2.carbon.core.services.util.CarbonAuthenticationUtil} - 'admin#carbon.super [-1234]' logged in at [2018-07-26 09:21:18,948+0530]
[2018-07-26 09:21:39,307] INFO {org.wso2.carbon.core.services.authentication.AuthenticationAdmin} - 'admin#carbon.super [-1234]' logged out at [2018-07-26 09:21:39,0306]
[2018-07-26 09:55:15,975] INFO {org.wso2.carbon.identity.application.authentication.framework.store.OperationCleanUpService} - Session Operation Data cleanup task is running successfully for removing expired Operation Data
After configuring the settings I receive the following Message:

Answer 1

Your application settings at WSO2-IS seems to be correct. The only thing to take into consideration, it is that ckanext-oauth2 is only able to use the Code and, the Refresh Token grant types, so only those types need to be allowed.
Using this configuration for ckanext-oauth2:
ckan.oauth2.authorization_endpoint = https://wso2IP/oauth2/authorize
ckan.oauth2.token_endpoint = https://wso2IP/oauth2/token
ckan.oauth2.profile_api_url = https://wso2IP/userinfo
ckan.oauth2.client_id = *** OAuth Client Key from the Inbound Authentication Configuration at WSO2 ***
ckan.oauth2.client_secret = *** OAuth Client Secret from the Inbound Authentication Configuration at WSO2 ***
ckan.oauth2.scope = all_info openid
ckan.oauth2.profile_api_user_field = email
ckan.oauth2.profile_api_fullname_field = name
ckan.oauth2.profile_api_mail_field = email
and using your claim mapping configuration (http://wso2.org/claims/fullname and http://wso2.org/claims/emailaddress); I was able to sign in into CKAN. I have tested using CKAN v2.7.4, v2.8.0 and v2.8.1; ckanext-oauth2 v0.6.1 and WSO2-IS v5.5.0 (although it should work using WSO2-IS v5.1).