/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.keycloak.authentication.authenticators.browser;

import org.keycloak.authentication.AuthenticationFlowContext;
import org.keycloak.authentication.AuthenticationFlowError;
import org.keycloak.authentication.Authenticator;
import org.keycloak.events.Errors;
import org.keycloak.forms.login.LoginFormsProvider;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.models.UserCredentialModel;
import org.keycloak.models.UserModel;
import org.keycloak.representations.idm.CredentialRepresentation;
import org.keycloak.services.messages.Messages;

import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class OTPFormAuthenticator extends AbstractUsernameFormAuthenticator implements Authenticator {
    @Override
    public void action(AuthenticationFlowContext context) {
        validateOTP(context);
    }

    @Override
    public void authenticate(AuthenticationFlowContext context) {
        Response challengeResponse = challenge(context, null);
        context.challenge(challengeResponse);
    }

    public void validateOTP(AuthenticationFlowContext context) {
        MultivaluedMap<String, String> inputData = context.getHttpRequest().getDecodedFormParameters();
        if (inputData.containsKey("cancel")) {
            context.resetFlow();
            return;
        }
        String password = inputData.getFirst(CredentialRepresentation.TOTP);
        if (password == null) {
            Response challengeResponse = challenge(context, null);
            context.challenge(challengeResponse);
            return;
        }
        boolean valid = context.getSession().userCredentialManager().isValid(context.getRealm(), context.getUser(),
                UserCredentialModel.otp(context.getRealm().getOTPPolicy().getType(), password));
        if (!valid) {
            context.getEvent().user(context.getUser())
                    .error(Errors.INVALID_USER_CREDENTIALS);
            Response challengeResponse = challenge(context, Messages.INVALID_TOTP);
            context.failureChallenge(AuthenticationFlowError.INVALID_CREDENTIALS, challengeResponse);
            return;
        }
        context.success();
    }

    @Override
    public boolean requiresUser() {
        return true;
    }

    protected Response challenge(AuthenticationFlowContext context, String error) {
        LoginFormsProvider forms = context.form();
        if (error != null) forms.setError(error);

        return forms.createLoginTotp();
    }

    @Override
    public boolean configuredFor(KeycloakSession session, RealmModel realm, UserModel user) {
        return session.userCredentialManager().isConfiguredFor(realm, user, realm.getOTPPolicy().getType());
    }

    @Override
    public void setRequiredActions(KeycloakSession session, RealmModel realm, UserModel user) {
        if (!user.getRequiredActions().contains(UserModel.RequiredAction.CONFIGURE_TOTP.name())) {
            user.addRequiredAction(UserModel.RequiredAction.CONFIGURE_TOTP.name());
        }

    }

    @Override
    public void close() {

    }
}