add media type jwk-set+json to accept header
Fixes gh-7290
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			@ -22,6 +22,7 @@ import java.net.URL;
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import java.security.interfaces.RSAPublicKey;
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import java.text.ParseException;
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import java.time.Instant;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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			@ -310,6 +311,7 @@ public final class NimbusJwtDecoder implements JwtDecoder {
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		}
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		private static class RestOperationsResourceRetriever implements ResourceRetriever {
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			private static final MediaType APPLICATION_JWK_SET_JSON = new MediaType("application", "jwk-set+json");
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			private final RestOperations restOperations;
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			RestOperationsResourceRetriever(RestOperations restOperations) {
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			@ -320,7 +322,7 @@ public final class NimbusJwtDecoder implements JwtDecoder {
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			@Override
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			public Resource retrieveResource(URL url) throws IOException {
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				HttpHeaders headers = new HttpHeaders();
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				headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8));
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				headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON, APPLICATION_JWK_SET_JSON));
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				ResponseEntity<String> response;
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				try {
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			@ -30,6 +30,7 @@ import java.util.Arrays;
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import java.util.Base64;
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import java.util.Collections;
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import java.util.Date;
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import java.util.List;
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import java.util.Map;
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import javax.crypto.SecretKey;
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			@ -54,8 +55,10 @@ import org.assertj.core.api.Assertions;
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import org.junit.BeforeClass;
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import org.junit.Test;
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import org.mockito.ArgumentCaptor;
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import org.springframework.core.convert.converter.Converter;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.RequestEntity;
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import org.springframework.http.ResponseEntity;
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import org.springframework.security.oauth2.core.OAuth2Error;
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			@ -72,6 +75,7 @@ import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
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import static org.mockito.ArgumentMatchers.any;
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import static org.mockito.ArgumentMatchers.eq;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.verify;
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import static org.mockito.Mockito.when;
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import static org.springframework.security.oauth2.jwt.NimbusJwtDecoder.withJwkSetUri;
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import static org.springframework.security.oauth2.jwt.NimbusJwtDecoder.withPublicKey;
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			@ -97,6 +101,8 @@ public class NimbusJwtDecoderTests {
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	private static final String RS256_SIGNED_JWT = "eyJhbGciOiJSUzI1NiJ9.eyJzdWIiOiJ0ZXN0LXN1YmplY3QiLCJleHAiOjE5NzQzMjYzMzl9.CT-H2OWEqmSs1NWmnta5ealLFvM8OlbQTjGhfRcKLNxrTrzsOkqBJl-AN3k16BQU7mS32o744TiiZ29NcDlxPsr1MqTlN86-dobPiuNIDLp3A1bOVdXMcVFuMYkrNv0yW0tGS9OjEqsCCuZDkZ1by6AhsHLbGwRY-6AQdcRouZygGpOQu1hNun5j8q5DpSTY4AXKARIFlF-O3OpVbPJ0ebr3Ki-i3U9p_55H0e4-wx2bqcApWlqgofl1I8NKWacbhZgn81iibup2W7E0CzCzh71u1Mcy3xk1sYePx-dwcxJnHmxJReBBWjJZEAeCrkbnn_OCuo2fA-EQyNJtlN5F2w";
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	private static final String VERIFY_KEY = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq4yKxb6SNePdDmQi9xFCrP6QvHosErQzryknQTTTffs0t3cy3Er3lIceuhZ7yQNSCDfPFqG8GoyoKhuChRiA5D+J2ab7bqTa1QJKfnCyERoscftgN2fXPHjHoiKbpGV2tMVw8mXl//tePOAiKbMJaBUnlAvJgkk1rVm08dSwpLC1sr2M19euf9jwnRGkMRZuhp9iCPgECRke5T8Ixpv0uQjSmGHnWUKTFlbj8sM83suROR1Ue64JSGScANc5vk3huJ/J97qTC+K2oKj6L8d9O8dpc4obijEOJwpydNvTYDgbiivYeSB00KS9jlBkQ5B2QqLvLVEygDl3dp59nGx6YQIDAQAB";
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	private static final MediaType APPLICATION_JWK_SET_JSON = new MediaType("application", "jwk-set+json");
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	private static KeyFactory kf;
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	NimbusJwtDecoder jwtDecoder = new NimbusJwtDecoder(withoutSigning());
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			@ -400,6 +406,23 @@ public class NimbusJwtDecoderTests {
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				.containsExactlyInAnyOrder(JWSAlgorithm.RS256, JWSAlgorithm.RS512);
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	}
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	// gh-7290
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	@Test
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	public void decodeWhenJwkSetRequestedThenAcceptHeaderJsonAndJwkSetJson() {
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		RestOperations restOperations = mock(RestOperations.class);
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		when(restOperations.exchange(any(RequestEntity.class), eq(String.class)))
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				.thenReturn(new ResponseEntity<>(JWK_SET, HttpStatus.OK));
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		JWTProcessor<SecurityContext> processor = withJwkSetUri("https://issuer/.well-known/jwks.json")
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				.restOperations(restOperations)
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				.processor();
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		NimbusJwtDecoder jwtDecoder = new NimbusJwtDecoder(processor);
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		jwtDecoder.decode(SIGNED_JWT);
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		ArgumentCaptor<RequestEntity> requestEntityCaptor = ArgumentCaptor.forClass(RequestEntity.class);
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		verify(restOperations).exchange(requestEntityCaptor.capture(), eq(String.class));
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		List<MediaType> acceptHeader = requestEntityCaptor.getValue().getHeaders().getAccept();
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		assertThat(acceptHeader).contains(MediaType.APPLICATION_JSON, APPLICATION_JWK_SET_JSON);
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	}
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	private RSAPublicKey key() throws InvalidKeySpecException {
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		byte[] decoded = Base64.getDecoder().decode(VERIFY_KEY.getBytes());
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		EncodedKeySpec spec = new X509EncodedKeySpec(decoded);
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