Unable to authenticate with Dockerized Keyrock and Dockerized Wirecloud locally.

[jason-fox]

I'm creating a tutorial where I wish to run Wirecloud and Keyrock together locally. The problem is as follows:

My yaml file relies on FIWARE_IDM_SERVER:

wirecloud:
        image: wirecloud/wirecloud
        container_name: fiware-wirecloud
        hostname: wirecloud
        ports:
            - "8000:8000"
        networks:
          default:
            ipv4_address: 172.18.1.10

        restart: always
        depends_on:
            - keyrock
            - elasticsearch
            - memcached
            - postgres-db
        environment:
            ...etc
            - FIWARE_IDM_SERVER=??????????
            - SOCIAL_AUTH_FIWARE_KEY=wirecloud-dckr-site-0000-00000000000
            - SOCIAL_AUTH_FIWARE_SECRET=wirecloud-docker-000000-clientsecret

 keyrock:
        image: fiware/idm:7.5.1
        container_name: fiware-keyrock
        hostname: keyrock
        networks:
          default:
            ipv4_address: 172.18.1.5
       ports:
            - "3005:3005"

The problem is as follows:

If FIWARE_IDM_SERVER=http://localhost:3005 I can get forwarded to Keyrock, but when a code is returned it can't be exchanged for a token, since at that point localhost refers to the localhost of the wireclould container.

If FIWARE_IDM_SERVER=http://172.18.1.5:3005 I would be able to do the token exchange (since both containers are in the same network) however I can't reach the Keyrock URL anyway since it isn't *really running on 172.18.1.5 -on the host machine it should be using to localhost

The fix is to split the ENV variable in two:

 - FIWARE_IDM_URL=http://localhost:3005
 - FIWARE_IDM_SERVER=http://172.18.1.5:3005

and update social_auth_backend.py as shown:

    if hasattr(settings, 'FIWARE_IDM_URL'):
        AUTHORIZATION_URL = urljoin(getattr(settings, 'FIWARE_IDM_URL', FIWARE_LAB_IDM_SERVER), FIWARE_AUTHORIZATION_ENDPOINT)
    else:
        AUTHORIZATION_URL = urljoin(getattr(settings, 'FIWARE_IDM_SERVER', FIWARE_LAB_IDM_SERVER), FIWARE_AUTHORIZATION_ENDPOINT)

Obviously if you are hosting Keyrock on a real URL this isn't an issue.

[aarranz]

All the Pull Request has been merged. So I think this should be fixed. In any case, feel free of reopening it if needed.