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 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.webadmin.authentication;

import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verifyZeroInteractions;
import static org.mockito.Mockito.when;

import java.util.Optional;

import org.apache.james.jwt.JwtTokenVerifier;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import com.google.common.collect.ImmutableSet;

import spark.HaltException;
import spark.Request;
import spark.Response;

class JwtFilterTest {
    private JwtTokenVerifier jwtTokenVerifier;
    private JwtFilter jwtFilter;

    @BeforeEach
    void setUp() {
        jwtTokenVerifier = mock(JwtTokenVerifier.class);
        jwtFilter = new JwtFilter(() -> jwtTokenVerifier);
    }

    @Test
    void handleShouldDoNothingOnOptions() throws Exception {
        Request request = mock(Request.class);
        //Ensure we don't take OPTIONS string from the constant pool
        when(request.requestMethod()).thenReturn(new String("OPTIONS"));
        Response response = mock(Response.class);

        jwtFilter.handle(request, response);

        verifyZeroInteractions(response);
    }


    @Test
    void handleShouldRejectRequestWithHeaders() throws Exception {
        Request request = mock(Request.class);
        when(request.requestMethod()).thenReturn("GET");
        when(request.headers()).thenReturn(ImmutableSet.of());

        assertThatThrownBy(() -> jwtFilter.handle(request, mock(Response.class)))
            .isInstanceOf(HaltException.class)
            .extracting(e -> HaltException.class.cast(e).statusCode())
            .isEqualTo(401);
    }

    @Test
    void handleShouldRejectRequestWithBearersHeaders() throws Exception {
        Request request = mock(Request.class);
        when(request.requestMethod()).thenReturn("GET");
        when(request.headers(JwtFilter.AUTHORIZATION_HEADER_NAME)).thenReturn("Invalid value");

        assertThatThrownBy(() -> jwtFilter.handle(request, mock(Response.class)))
            .isInstanceOf(HaltException.class)
            .extracting(e -> HaltException.class.cast(e).statusCode())
            .isEqualTo(401);
    }

    @Test
    void handleShouldRejectRequestWithInvalidBearerHeaders() throws Exception {
        Request request = mock(Request.class);
        when(request.requestMethod()).thenReturn("GET");
        when(request.headers(JwtFilter.AUTHORIZATION_HEADER_NAME)).thenReturn("Bearer value");
        when(jwtTokenVerifier.verifyAndExtractLogin("value")).thenReturn(Optional.empty());


        assertThatThrownBy(() -> jwtFilter.handle(request, mock(Response.class)))
            .isInstanceOf(HaltException.class)
            .extracting(e -> HaltException.class.cast(e).statusCode())
            .isEqualTo(401);
    }

    @Test
    void handleShouldRejectRequestWithoutAdminClaim() throws Exception {
        Request request = mock(Request.class);
        when(request.requestMethod()).thenReturn("GET");
        when(request.headers(JwtFilter.AUTHORIZATION_HEADER_NAME)).thenReturn("Bearer value");
        when(jwtTokenVerifier.verifyAndExtractLogin("value")).thenReturn(Optional.of("value"));
        when(jwtTokenVerifier.hasAttribute("admin", true, "value")).thenReturn(false);

        assertThatThrownBy(() -> jwtFilter.handle(request, mock(Response.class)))
            .isInstanceOf(HaltException.class)
            .extracting(e -> HaltException.class.cast(e).statusCode())
            .isEqualTo(401);
    }

    @Test
    void handleShouldAcceptValidJwt() throws Exception {
        Request request = mock(Request.class);
        when(request.requestMethod()).thenReturn("GET");
        when(request.headers(JwtFilter.AUTHORIZATION_HEADER_NAME)).thenReturn("Bearer value");
        when(jwtTokenVerifier.verifyAndExtractLogin("value")).thenReturn(Optional.of("value"));
        when(jwtTokenVerifier.hasAttribute("admin", true, "value")).thenReturn(true);

        jwtFilter.handle(request, mock(Response.class));
    }
}
