<%#
 Copyright 2013-2021 the original author or authors from the JHipster project.

 This file is part of the JHipster project, see https://www.jhipster.tech/
 for more information.

 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

      https://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 <%= packageName %>.security.jwt;

import <%= packageName %>.security.AuthoritiesConstants;

import java.security.Key;
import java.util.*;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.test.util.ReflectionTestUtils;

import tech.jhipster.config.JHipsterProperties;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;

import java.nio.charset.StandardCharsets;

import static org.assertj.core.api.Assertions.assertThat;

class TokenProviderTest {

    private static final long ONE_MINUTE = 60000;

    private Key key;
    private TokenProvider tokenProvider;

    @BeforeEach
    public void setup() {
        JHipsterProperties jHipsterProperties = new JHipsterProperties();
        String base64Secret = "fd54a45s65fds737b9aafcb3412e07ed99b267f33413274720ddbb7f6c5e64e9f14075f2d7ed041592f0b7657baf8";
        jHipsterProperties.getSecurity().getAuthentication().getJwt().setBase64Secret(base64Secret);
        tokenProvider = new TokenProvider(jHipsterProperties);
        key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(base64Secret));

        ReflectionTestUtils.setField(tokenProvider, "key", key);
        ReflectionTestUtils.setField(tokenProvider, "tokenValidityInMilliseconds", ONE_MINUTE);
    }

    @Test
    void testReturnFalseWhenJWThasInvalidSignature() {
        boolean isTokenValid = tokenProvider.validateToken(createTokenWithDifferentSignature());

        assertThat(isTokenValid).isFalse();
    }

    @Test
    void testReturnFalseWhenJWTisMalformed() {
        Authentication authentication = createAuthentication();
        String token = tokenProvider.createToken(authentication, false);
        String invalidToken = token.substring(1);
        boolean isTokenValid = tokenProvider.validateToken(invalidToken);

        assertThat(isTokenValid).isFalse();
    }

    @Test
    void testReturnFalseWhenJWTisExpired() {
        ReflectionTestUtils.setField(tokenProvider, "tokenValidityInMilliseconds", -ONE_MINUTE);

        Authentication authentication = createAuthentication();
        String token = tokenProvider.createToken(authentication, false);

        boolean isTokenValid = tokenProvider.validateToken(token);

        assertThat(isTokenValid).isFalse();
    }

    @Test
    void testReturnFalseWhenJWTisUnsupported() {
        String unsupportedToken = createUnsupportedToken();

        boolean isTokenValid = tokenProvider.validateToken(unsupportedToken);

        assertThat(isTokenValid).isFalse();
    }

    @Test
    void testReturnFalseWhenJWTisInvalid() {
        boolean isTokenValid = tokenProvider.validateToken("");

        assertThat(isTokenValid).isFalse();
    }

    @Test
    void testKeyIsSetFromSecretWhenSecretIsNotEmpty() {
        final String secret = "NwskoUmKHZtzGRKJKVjsJF7BtQMMxNWi";
        JHipsterProperties jHipsterProperties = new JHipsterProperties();
        jHipsterProperties.getSecurity().getAuthentication().getJwt().setSecret(secret);

        TokenProvider tokenProvider = new TokenProvider(jHipsterProperties);

        Key key = (Key) ReflectionTestUtils.getField(tokenProvider, "key");
        assertThat(key).isNotNull().isEqualTo(Keys.hmacShaKeyFor(secret.getBytes(StandardCharsets.UTF_8)));
    }

    @Test
    void testKeyIsSetFromBase64SecretWhenSecretIsEmpty() {
        final String base64Secret = "fd54a45s65fds737b9aafcb3412e07ed99b267f33413274720ddbb7f6c5e64e9f14075f2d7ed041592f0b7657baf8";
        JHipsterProperties jHipsterProperties = new JHipsterProperties();
        jHipsterProperties.getSecurity().getAuthentication().getJwt().setBase64Secret(base64Secret);

        TokenProvider tokenProvider = new TokenProvider(jHipsterProperties);

        Key key = (Key) ReflectionTestUtils.getField(tokenProvider, "key");
        assertThat(key).isNotNull().isEqualTo(Keys.hmacShaKeyFor(Decoders.BASE64.decode(base64Secret)));
    }

    private Authentication createAuthentication() {
        Collection<GrantedAuthority> authorities = new ArrayList<>();
        authorities.add(new SimpleGrantedAuthority(AuthoritiesConstants.ANONYMOUS));
        return new UsernamePasswordAuthenticationToken("anonymous", "anonymous", authorities);
    }

    private String createUnsupportedToken() {
        return Jwts.builder()
            .setPayload("payload")
            .signWith(key, SignatureAlgorithm.HS512)
            .compact();
    }

    private String createTokenWithDifferentSignature() {
        Key otherKey = Keys.hmacShaKeyFor(Decoders.BASE64
            .decode("Xfd54a45s65fds737b9aafcb3412e07ed99b267f33413274720ddbb7f6c5e64e9f14075f2d7ed041592f0b7657baf8"));

        return Jwts.builder()
            .setSubject("anonymous")
            .signWith(otherKey, SignatureAlgorithm.HS512)
            .setExpiration(new Date(new Date().getTime() + ONE_MINUTE))
            .compact();
    }
}