package org.keycloak.broker.oidc.mappers;

import org.keycloak.broker.oidc.KeycloakOIDCIdentityProvider;
import org.keycloak.broker.oidc.KeycloakOIDCIdentityProviderFactory;
import org.keycloak.broker.oidc.OIDCIdentityProviderFactory;
import org.keycloak.broker.provider.BrokeredIdentityContext;
import org.keycloak.broker.provider.HardcodedRoleMapper;
import org.keycloak.broker.provider.IdentityBrokerException;
import org.keycloak.models.IdentityProviderMapperModel;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.models.RoleModel;
import org.keycloak.models.UserModel;
import org.keycloak.provider.ProviderConfigProperty;
import org.keycloak.representations.JsonWebToken;

import java.util.ArrayList;
import java.util.List;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class ExternalKeycloakRoleToRoleMapper extends AbstractClaimMapper {

    public static final String[] COMPATIBLE_PROVIDERS = {KeycloakOIDCIdentityProviderFactory.PROVIDER_ID};

    private static final List<ProviderConfigProperty> configProperties = new ArrayList<ProviderConfigProperty>();
    private static final String EXTERNAL_ROLE = "external.role";

    static {
        ProviderConfigProperty property;
        ProviderConfigProperty property1;
        property1 = new ProviderConfigProperty();
        property1.setName(EXTERNAL_ROLE);
        property1.setLabel("External role");
        property1.setHelpText("External role to check for.  To reference an application role the syntax is appname.approle, i.e. myapp.myrole.");
        property1.setType(ProviderConfigProperty.STRING_TYPE);
        configProperties.add(property1);
        property = new ProviderConfigProperty();
        property.setName(HardcodedRoleMapper.ROLE);
        property.setLabel("Role");
        property.setHelpText("Role to grant to user if external role is present.  To reference an application role the syntax is appname.approle, i.e. myapp.myrole");
        property.setType(ProviderConfigProperty.STRING_TYPE);
        configProperties.add(property);
    }

    public static final String PROVIDER_ID = "keycloak-oidc-role-to-role-idp-mapper";


    @Override
    public List<ProviderConfigProperty> getConfigProperties() {
        return configProperties;
    }

    @Override
    public String getId() {
        return PROVIDER_ID;
    }

    @Override
    public String[] getCompatibleProviders() {
        return COMPATIBLE_PROVIDERS;
    }

    @Override
    public String getDisplayCategory() {
        return "Role Importer";
    }

    @Override
    public String getDisplayType() {
        return "External Role to Role";
    }

    @Override
    public void importNewUser(KeycloakSession session, RealmModel realm, UserModel user, IdentityProviderMapperModel mapperModel, BrokeredIdentityContext context) {
        RoleModel role = hasRole(realm, mapperModel, context);
        if (role != null) {
            user.grantRole(role);
        }
    }

    private RoleModel hasRole(RealmModel realm,IdentityProviderMapperModel mapperModel, BrokeredIdentityContext context) {
        JsonWebToken token = (JsonWebToken)context.getContextData().get(KeycloakOIDCIdentityProvider.VALIDATED_ACCESS_TOKEN);
        //if (token == null) return;
        String roleName = mapperModel.getConfig().get(HardcodedRoleMapper.ROLE);
        String[] parseRole = HardcodedRoleMapper.parseRole(mapperModel.getConfig().get(EXTERNAL_ROLE));
        String externalRoleName = parseRole[1];
        String claimName = null;
        if (parseRole[0] == null) {
            claimName = "realm_access.roles";
        } else {
            claimName = "resource_access." + parseRole[0] + ".roles";
        }
        Object claim = getClaimValue(token, claimName);
        if (valueEquals(externalRoleName, claim)) {
            RoleModel role = HardcodedRoleMapper.getRoleFromString(realm, roleName);
            if (role == null) throw new IdentityBrokerException("Unable to find role: " + roleName);
            return role;
        }
        return null;
    }

    @Override
    public void updateBrokeredUser(KeycloakSession session, RealmModel realm, UserModel user, IdentityProviderMapperModel mapperModel, BrokeredIdentityContext context) {
        RoleModel role = hasRole(realm, mapperModel, context);
        if (role == null) {
            user.deleteRoleMapping(role);
        }
    }

    @Override
    public String getHelpText() {
        return "Looks for an external role in a keycloak access token.  If external role exists, grant the user the specified realm or application role.";
    }

}
