/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.keycloak.services.resources;

import org.jboss.resteasy.logging.Logger;
import org.jboss.resteasy.spi.HttpRequest;
import org.keycloak.OAuth2Constants;
import org.keycloak.account.Account;
import org.keycloak.account.AccountLoader;
import org.keycloak.account.AccountPages;
import org.keycloak.jaxrs.JaxrsOAuthClient;
import org.keycloak.models.*;
import org.keycloak.models.utils.TimeBasedOTP;
import org.keycloak.representations.idm.CredentialRepresentation;
import org.keycloak.services.managers.AppAuthManager;
import org.keycloak.services.managers.Auth;
import org.keycloak.services.managers.ModelToRepresentation;
import org.keycloak.services.managers.SocialRequestManager;
import org.keycloak.services.managers.TokenManager;
import org.keycloak.services.messages.Messages;
import org.keycloak.services.resources.flows.Flows;
import org.keycloak.services.resources.flows.Urls;
import org.keycloak.services.validation.Validation;
import org.keycloak.social.SocialLoader;
import org.keycloak.social.SocialProvider;
import org.keycloak.social.SocialProviderException;
import org.keycloak.spi.authentication.AuthProviderStatus;
import org.keycloak.spi.authentication.AuthenticationProviderException;
import org.keycloak.spi.authentication.AuthenticationProviderManager;

import javax.ws.rs.*;
import javax.ws.rs.core.*;
import java.net.URI;
import java.util.List;
import java.util.UUID;

/**
 * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
 */
public class AccountService {

    private static final Logger logger = Logger.getLogger(AccountService.class);

    public static final String KEYCLOAK_ACCOUNT_IDENTITY_COOKIE = "KEYCLOAK_ACCOUNT_IDENTITY";

    private RealmModel realm;

    @Context
    private HttpRequest request;

    @Context
    protected HttpHeaders headers;

    @Context
    private UriInfo uriInfo;

    private final AppAuthManager authManager;
    private final ApplicationModel application;
    private final SocialRequestManager socialRequestManager;

    public AccountService(RealmModel realm, ApplicationModel application, TokenManager tokenManager, SocialRequestManager socialRequestManager) {
        this.realm = realm;
        this.application = application;
        this.authManager =  new AppAuthManager(KEYCLOAK_ACCOUNT_IDENTITY_COOKIE, tokenManager);
        this.socialRequestManager = socialRequestManager;
    }

    public static UriBuilder accountServiceBaseUrl(UriInfo uriInfo) {
        UriBuilder base = uriInfo.getBaseUriBuilder().path(RealmsResource.class).path(RealmsResource.class, "getAccountService");
        return base;
    }


    private Response forwardToPage(String path, AccountPages page) {
        Auth auth = getAuth(false);
        if (auth != null) {
            try {
                require(auth, AccountRoles.MANAGE_ACCOUNT);
            } catch (ForbiddenException e) {
                return Flows.forms(realm, request, uriInfo).setError("No access").createErrorPage();
            }

            Account account = AccountLoader.load().createAccount(uriInfo).setRealm(realm).setUser(auth.getUser());

            String[] referrer = getReferrer();
            if (referrer != null) {
                account.setReferrer(referrer);
            }

            return account.createResponse(page);
        } else {
            return login(path);
        }
    }

    @Path("/")
    @OPTIONS
    public Response accountPreflight() {
        return Cors.add(request, Response.ok()).auth().preflight().build();
    }

    @Path("/")
    @GET
    public Response accountPage() {
        List<MediaType> types = headers.getAcceptableMediaTypes();
        if (types.contains(MediaType.WILDCARD_TYPE) || (types.contains(MediaType.TEXT_HTML_TYPE))) {
            return forwardToPage(null, AccountPages.ACCOUNT);
        } else if (types.contains(MediaType.APPLICATION_JSON_TYPE)) {
            Auth auth = getAuth(true);
            requireOneOf(auth, AccountRoles.MANAGE_ACCOUNT, AccountRoles.VIEW_PROFILE);

            return Cors.add(request, Response.ok(ModelToRepresentation.toRepresentation(auth.getUser()))).auth().allowedOrigins(auth.getClient()).build();
        } else {
            return Response.notAcceptable(Variant.VariantListBuilder.newInstance().mediaTypes(MediaType.TEXT_HTML_TYPE, MediaType.APPLICATION_JSON_TYPE).build()).build();
        }
    }

    @Path("totp")
    @GET
    public Response totpPage() {
        return forwardToPage("totp", AccountPages.TOTP);
    }

    @Path("password")
    @GET
    public Response passwordPage() {
        return forwardToPage("password", AccountPages.PASSWORD);
    }

    @Path("social")
    @GET
    public Response socialPage() {
        return forwardToPage("social", AccountPages.SOCIAL);
    }

    @Path("/")
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public Response processAccountUpdate(final MultivaluedMap<String, String> formData) {
        Auth auth = getAuth(true);
        require(auth, AccountRoles.MANAGE_ACCOUNT);

        UserModel user = auth.getUser();

        Account account = AccountLoader.load().createAccount(uriInfo).setRealm(realm).setUser(auth.getUser());

        String error = Validation.validateUpdateProfileForm(formData);
        if (error != null) {
            return account.setError(error).createResponse(AccountPages.ACCOUNT);
        }

        user.setFirstName(formData.getFirst("firstName"));
        user.setLastName(formData.getFirst("lastName"));
        user.setEmail(formData.getFirst("email"));

        return account.setSuccess("accountUpdated").createResponse(AccountPages.ACCOUNT);
    }

    @Path("totp-remove")
    @GET
    public Response processTotpRemove() {
        Auth auth = getAuth(true);
        require(auth, AccountRoles.MANAGE_ACCOUNT);

        UserModel user = auth.getUser();
        user.setTotp(false);

        Account account = AccountLoader.load().createAccount(uriInfo).setRealm(realm).setUser(auth.getUser());
        return account.setSuccess("successTotpRemoved").createResponse(AccountPages.TOTP);
    }

    @Path("totp")
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public Response processTotpUpdate(final MultivaluedMap<String, String> formData) {
        Auth auth = getAuth(true);
        require(auth, AccountRoles.MANAGE_ACCOUNT);

        UserModel user = auth.getUser();

        String totp = formData.getFirst("totp");
        String totpSecret = formData.getFirst("totpSecret");

        Account account = AccountLoader.load().createAccount(uriInfo).setRealm(realm).setUser(auth.getUser());

        if (Validation.isEmpty(totp)) {
            return account.setError(Messages.MISSING_TOTP).createResponse(AccountPages.TOTP);
        } else if (!new TimeBasedOTP().validate(totp, totpSecret.getBytes())) {
            return account.setError(Messages.INVALID_TOTP).createResponse(AccountPages.TOTP);
        }

        UserCredentialModel credentials = new UserCredentialModel();
        credentials.setType(CredentialRepresentation.TOTP);
        credentials.setValue(totpSecret);
        realm.updateCredential(user, credentials);

        user.setTotp(true);

        return account.setSuccess("successTotp").createResponse(AccountPages.TOTP);
    }

    @Path("password")
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public Response processPasswordUpdate(final MultivaluedMap<String, String> formData) {
        Auth auth = getAuth(true);
        require(auth, AccountRoles.MANAGE_ACCOUNT);

        UserModel user = auth.getUser();

        Account account = AccountLoader.load().createAccount(uriInfo).setRealm(realm).setUser(auth.getUser());

        String password = formData.getFirst("password");
        String passwordNew = formData.getFirst("password-new");
        String passwordConfirm = formData.getFirst("password-confirm");

        if (Validation.isEmpty(passwordNew)) {
            return account.setError(Messages.MISSING_PASSWORD).createResponse(AccountPages.PASSWORD);
        } else if (!passwordNew.equals(passwordConfirm)) {
            return account.setError(Messages.INVALID_PASSWORD_CONFIRM).createResponse(AccountPages.PASSWORD);
        }

        AuthenticationProviderManager authProviderManager = AuthenticationProviderManager.getManager(realm);
        if (Validation.isEmpty(password)) {
            return account.setError(Messages.MISSING_PASSWORD).createResponse(AccountPages.PASSWORD);
            // TODO: This may not work in some cases. For example if ldap username is "foo" but actual loginName of user is "bar", which could theoretically happen...
        } else if (authProviderManager.validatePassword(user.getLoginName(), password).getAuthProviderStatus() != AuthProviderStatus.SUCCESS) {
            return account.setError(Messages.INVALID_PASSWORD_EXISTING).createResponse(AccountPages.PASSWORD);
        }

        try {
            authProviderManager.updatePassword(user.getLoginName(), passwordNew);
        } catch (AuthenticationProviderException ape) {
            return account.setError(ape.getMessage()).createResponse(AccountPages.PASSWORD);
        }

        return account.setSuccess("accountPasswordUpdated").createResponse(AccountPages.PASSWORD);
    }

    @Path("social-update")
    @GET
    public Response processSocialUpdate(@QueryParam("action") String action,
                                        @QueryParam("provider_id") String providerId) {
        Auth auth = getAuth(true);
        require(auth, AccountRoles.MANAGE_ACCOUNT);
        UserModel user = auth.getUser();

        Account account = AccountLoader.load().createAccount(uriInfo).setRealm(realm).setUser(auth.getUser());

        if (Validation.isEmpty(providerId)) {
            return account.setError(Messages.MISSING_SOCIAL_PROVIDER).createResponse(AccountPages.SOCIAL);
        }
        AccountSocialAction accountSocialAction = AccountSocialAction.getAction(action);
        if (accountSocialAction == null) {
            return account.setError(Messages.INVALID_SOCIAL_ACTION).createResponse(AccountPages.SOCIAL);
        }

        SocialProvider provider = SocialLoader.load(providerId);
        if (provider == null) {
            return account.setError(Messages.SOCIAL_PROVIDER_NOT_FOUND).createResponse(AccountPages.SOCIAL);
        }

        if (!user.isEnabled()) {
            return account.setError(Messages.ACCOUNT_DISABLED).createResponse(AccountPages.SOCIAL);
        }

        switch (accountSocialAction) {
            case ADD:
                String redirectUri = UriBuilder.fromUri(Urls.accountSocialPage(uriInfo.getBaseUri(), realm.getName())).build().toString();

                try {
                    return Flows.social(socialRequestManager, realm, uriInfo, provider)
                            .putClientAttribute("realm", realm.getName())
                            .putClientAttribute("clientId", Constants.ACCOUNT_MANAGEMENT_APP)
                            .putClientAttribute(OAuth2Constants.STATE, UUID.randomUUID().toString()).putClientAttribute("redirectUri", redirectUri)
                            .putClientAttribute("userId", user.getId())
                            .redirectToSocialProvider();
                } catch (SocialProviderException spe) {
                    return account.setError(Messages.SOCIAL_REDIRECT_ERROR).createResponse(AccountPages.SOCIAL);
                }
            case REMOVE:
                if (realm.removeSocialLink(user, providerId)) {
                    logger.debug("Social provider " + providerId + " removed successfully from user " + user.getLoginName());
                    return account.setSuccess(Messages.SOCIAL_PROVIDER_REMOVED).createResponse(AccountPages.SOCIAL);
                } else {
                    return account.setError(Messages.SOCIAL_LINK_NOT_ACTIVE).createResponse(AccountPages.SOCIAL);
                }
            default:
                // Shouldn't happen
                logger.warn("Action is null!");
                return null;
        }
    }

    @Path("login-redirect")
    @GET
    public Response loginRedirect(@QueryParam("code") String code,
                                  @QueryParam("state") String state,
                                  @QueryParam("error") String error,
                                  @QueryParam("path") String path,
                                  @QueryParam("referrer") String referrer,
                                  @Context HttpHeaders headers) {
        try {
            if (error != null) {
                logger.debug("error from oauth");
                throw new ForbiddenException("error");
            }
            if (!realm.isEnabled()) {
                logger.debug("realm not enabled");
                throw new ForbiddenException();
            }
            if (!application.isEnabled()) {
                logger.debug("account management app not enabled");
                throw new ForbiddenException();
            }
            if (code == null) {
                logger.debug("code not specified");
                throw new BadRequestException();
            }
            if (state == null) {
                logger.debug("state not specified");
                throw new BadRequestException();
            }

            URI accountUri = Urls.accountBase(uriInfo.getBaseUri()).path("/").build(realm.getName());
            URI redirectUri = path != null ? accountUri.resolve(path) : accountUri;
            if (referrer != null) {
                redirectUri = redirectUri.resolve("?referrer=" + referrer);
            }

            NewCookie cookie = authManager.createCookie(realm, application, code, Urls.accountBase(uriInfo.getBaseUri()).build(realm.getName()));
            return Response.status(302).cookie(cookie).location(redirectUri).build();
        } finally {
            authManager.expireCookie(Urls.accountBase(uriInfo.getBaseUri()).build(realm.getName()));
        }
    }

    @Path("logout")
    @GET
    public Response logout() {
        URI baseUri = Urls.accountBase(uriInfo.getBaseUri()).build(realm.getName());
        authManager.expireIdentityCookie(realm, uriInfo);
        authManager.expireCookie(baseUri);
        return Response.status(302).location(baseUri).build();
    }

    private Response login(String path) {
        JaxrsOAuthClient oauth = new JaxrsOAuthClient();
        String authUrl = Urls.realmLoginPage(uriInfo.getBaseUri(), realm.getName()).toString();
        oauth.setAuthUrl(authUrl);

        oauth.setClientId(Constants.ACCOUNT_MANAGEMENT_APP);

        UriBuilder uriBuilder = Urls.accountPageBuilder(uriInfo.getBaseUri()).path(AccountService.class, "loginRedirect");

        if (path != null) {
            uriBuilder.queryParam("path", path);
        }

        String referrer = uriInfo.getQueryParameters().getFirst("referrer");
        if (referrer != null) {
            uriBuilder.queryParam("referrer", referrer);
        }

        String referrerUri = uriInfo.getQueryParameters().getFirst("referrer_uri");
        if (referrerUri != null) {
            uriBuilder.queryParam("referrer_uri", referrerUri);
        }

        URI accountUri = uriBuilder.build(realm.getName());

        oauth.setStateCookiePath(accountUri.getRawPath());
        return oauth.redirect(uriInfo, accountUri.toString());
    }

    private Auth getAuth(boolean error) {
        Auth auth = authManager.authenticate(realm, headers);
        if (auth == null && error) {
            throw new ForbiddenException();
        }
        return auth;
    }

    private String[] getReferrer() {
        String referrer = uriInfo.getQueryParameters().getFirst("referrer");
        if (referrer == null) {
            return null;
        }

        String referrerUri = uriInfo.getQueryParameters().getFirst("referrer_uri");

        ApplicationModel application = realm.getApplicationByName(referrer);
        if (application != null) {
            if (referrerUri != null) {
                referrerUri = TokenService.verifyRedirectUri(referrerUri, application);
            } else {
                referrerUri = application.getBaseUrl();
            }

            if (referrerUri != null) {
                return new String[] { referrer, referrerUri };
            }
        } else if (referrerUri != null) {
            ClientModel client = realm.getOAuthClient(referrer);
            if (client != null) {
                referrerUri = TokenService.verifyRedirectUri(referrerUri, application);

                if (referrerUri != null) {
                    return new String[] { referrer, referrerUri };
                }
            }
        }

        return null;
    }

    public void require(Auth auth, String role) {
        if (!auth.hasAppRole(application.getName(), role)) {
            throw new ForbiddenException();
        }
    }

    public void requireOneOf(Auth auth, String... roles) {
        if (!auth.hasOneOfAppRole(application.getName(), roles)) {
            throw new ForbiddenException();
        }
    }

    public enum AccountSocialAction {
        ADD,
        REMOVE;

        public static AccountSocialAction getAction(String action) {
            if ("add".equalsIgnoreCase(action)) {
                return ADD;
            } else if ("remove".equalsIgnoreCase(action)) {
                return REMOVE;
            } else {
                return null;
            }
        }
    }

}
