diff --git a/oauth2/oauth2-jose/spring-security-oauth2-jose.gradle b/oauth2/oauth2-jose/spring-security-oauth2-jose.gradle
index 3336a2ffdd..4aa62bb852 100644
--- a/oauth2/oauth2-jose/spring-security-oauth2-jose.gradle
+++ b/oauth2/oauth2-jose/spring-security-oauth2-jose.gradle
@@ -6,6 +6,7 @@ dependencies {
compile springCoreDependency
compile 'com.nimbusds:nimbus-jose-jwt'
+ optional 'com.nimbusds:oauth2-oidc-sdk'
optional 'io.projectreactor:reactor-core'
optional 'org.springframework:spring-webflux'
diff --git a/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtDecoders.java b/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtDecoders.java
new file mode 100644
index 0000000000..64b6d200d6
--- /dev/null
+++ b/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtDecoders.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2002-2018 the original author or authors.
+ *
+ * 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.springframework.security.oauth2.jwt;
+
+import com.nimbusds.oauth2.sdk.ParseException;
+import com.nimbusds.openid.connect.sdk.op.OIDCProviderMetadata;
+
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * Allows creating a {@link JwtDecoder} from an
+ * OpenID Provider Configuration.
+ *
+ * @author Josh Cummings
+ * @since 5.1
+ */
+public final class JwtDecoders {
+
+ /**
+ * Creates a {@link JwtDecoder} using the provided
+ * Issuer by making an
+ * OpenID Provider
+ * Configuration Request and using the values in the
+ * OpenID
+ * Provider Configuration Response to initialize the {@link JwtDecoder}.
+ *
+ * @param oidcIssuerLocation the Issuer
+ * @return a {@link JwtDecoder} that was initialized by the OpenID Provider Configuration.
+ */
+ public static JwtDecoder fromOidcIssuerLocation(String oidcIssuerLocation) {
+ String openidConfiguration = getOpenidConfiguration(oidcIssuerLocation);
+ OIDCProviderMetadata metadata = parse(openidConfiguration);
+ String metadataIssuer = metadata.getIssuer().getValue();
+ if (!oidcIssuerLocation.equals(metadataIssuer)) {
+ throw new IllegalStateException("The Issuer \"" + metadataIssuer + "\" provided in the OpenID Configuration " +
+ "did not match the requested issuer \"" + oidcIssuerLocation + "\"");
+ }
+
+ OAuth2TokenValidator jwtValidator =
+ JwtValidators.createDefaultWithIssuer(oidcIssuerLocation);
+
+ NimbusJwtDecoderJwkSupport jwtDecoder =
+ new NimbusJwtDecoderJwkSupport(metadata.getJWKSetURI().toASCIIString());
+ jwtDecoder.setJwtValidator(jwtValidator);
+
+ return jwtDecoder;
+ }
+
+ private static String getOpenidConfiguration(String issuer) {
+ RestTemplate rest = new RestTemplate();
+ try {
+ return rest.getForObject(issuer + "/.well-known/openid-configuration", String.class);
+ } catch(RuntimeException e) {
+ throw new IllegalArgumentException("Unable to resolve the OpenID Configuration with the provided Issuer of " +
+ "\"" + issuer + "\"", e);
+ }
+ }
+
+ private static OIDCProviderMetadata parse(String body) {
+ try {
+ return OIDCProviderMetadata.parse(body);
+ }
+ catch (ParseException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ private JwtDecoders() {}
+}
diff --git a/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/JwtDecodersTests.java b/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/JwtDecodersTests.java
new file mode 100644
index 0000000000..22c149d7d5
--- /dev/null
+++ b/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/JwtDecodersTests.java
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2002-2018 the original author or authors.
+ *
+ * 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.springframework.security.oauth2.jwt;
+
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+
+import static org.assertj.core.api.Assertions.assertThatCode;
+
+/**
+ * Tests for {@link JwtDecoders}
+ *
+ * @author Josh Cummings
+ */
+public class JwtDecodersTests {
+ /**
+ * Contains those parameters required to construct a JwtDecoder as well as any required parameters
+ */
+ private static final String DEFAULT_RESPONSE_TEMPLATE =
+ "{\n"
+ + " \"authorization_endpoint\": \"https://example.com/o/oauth2/v2/auth\", \n"
+ + " \"id_token_signing_alg_values_supported\": [\n"
+ + " \"RS256\"\n"
+ + " ], \n"
+ + " \"issuer\": \"%s\", \n"
+ + " \"jwks_uri\": \"%s/.well-known/jwks.json\", \n"
+ + " \"response_types_supported\": [\n"
+ + " \"code\", \n"
+ + " \"token\", \n"
+ + " \"id_token\", \n"
+ + " \"code token\", \n"
+ + " \"code id_token\", \n"
+ + " \"token id_token\", \n"
+ + " \"code token id_token\", \n"
+ + " \"none\"\n"
+ + " ], \n"
+ + " \"subject_types_supported\": [\n"
+ + " \"public\"\n"
+ + " ], \n"
+ + " \"token_endpoint\": \"https://example.com/oauth2/v4/token\"\n"
+ + "}";
+
+ private static final String JWK_SET = "{\"keys\":[{\"p\":\"49neceJFs8R6n7WamRGy45F5Tv0YM-R2ODK3eSBUSLOSH2tAqjEVKOkLE5fiNA3ygqq15NcKRadB2pTVf-Yb5ZIBuKzko8bzYIkIqYhSh_FAdEEr0vHF5fq_yWSvc6swsOJGqvBEtuqtJY027u-G2gAQasCQdhyejer68zsTn8M\",\"kty\":\"RSA\",\"q\":\"tWR-ysspjZ73B6p2vVRVyHwP3KQWL5KEQcdgcmMOE_P_cPs98vZJfLhxobXVmvzuEWBpRSiqiuyKlQnpstKt94Cy77iO8m8ISfF3C9VyLWXi9HUGAJb99irWABFl3sNDff5K2ODQ8CmuXLYM25OwN3ikbrhEJozlXg_NJFSGD4E\",\"d\":\"FkZHYZlw5KSoqQ1i2RA2kCUygSUOf1OqMt3uomtXuUmqKBm_bY7PCOhmwbvbn4xZYEeHuTR8Xix-0KpHe3NKyWrtRjkq1T_un49_1LLVUhJ0dL-9_x0xRquVjhl_XrsRXaGMEHs8G9pLTvXQ1uST585gxIfmCe0sxPZLvwoic-bXf64UZ9BGRV3lFexWJQqCZp2S21HfoU7wiz6kfLRNi-K4xiVNB1gswm_8o5lRuY7zB9bRARQ3TS2G4eW7p5sxT3CgsGiQD3_wPugU8iDplqAjgJ5ofNJXZezoj0t6JMB_qOpbrmAM1EnomIPebSLW7Ky9SugEd6KMdL5lW6AuAQ\",\"e\":\"AQAB\",\"use\":\"sig\",\"kid\":\"one\",\"qi\":\"wdkFu_tV2V1l_PWUUimG516Zvhqk2SWDw1F7uNDD-Lvrv_WNRIJVzuffZ8WYiPy8VvYQPJUrT2EXL8P0ocqwlaSTuXctrORcbjwgxDQDLsiZE0C23HYzgi0cofbScsJdhcBg7d07LAf7cdJWG0YVl1FkMCsxUlZ2wTwHfKWf-v4\",\"dp\":\"uwnPxqC-IxG4r33-SIT02kZC1IqC4aY7PWq0nePiDEQMQWpjjNH50rlq9EyLzbtdRdIouo-jyQXB01K15-XXJJ60dwrGLYNVqfsTd0eGqD1scYJGHUWG9IDgCsxyEnuG3s0AwbW2UolWVSsU2xMZGb9PurIUZECeD1XDZwMp2s0\",\"dq\":\"hra786AunB8TF35h8PpROzPoE9VJJMuLrc6Esm8eZXMwopf0yhxfN2FEAvUoTpLJu93-UH6DKenCgi16gnQ0_zt1qNNIVoRfg4rw_rjmsxCYHTVL3-RDeC8X_7TsEySxW0EgFTHh-nr6I6CQrAJjPM88T35KHtdFATZ7BCBB8AE\",\"n\":\"oXJ8OyOv_eRnce4akdanR4KYRfnC2zLV4uYNQpcFn6oHL0dj7D6kxQmsXoYgJV8ZVDn71KGmuLvolxsDncc2UrhyMBY6DVQVgMSVYaPCTgW76iYEKGgzTEw5IBRQL9w3SRJWd3VJTZZQjkXef48Ocz06PGF3lhbz4t5UEZtdF4rIe7u-977QwHuh7yRPBQ3sII-cVoOUMgaXB9SHcGF2iZCtPzL_IffDUcfhLQteGebhW8A6eUHgpD5A1PQ-JCw_G7UOzZAjjDjtNM2eqm8j-Ms_gqnm4MiCZ4E-9pDN77CAAPVN7kuX6ejs9KBXpk01z48i9fORYk9u7rAkh1HuQw\"}]}";
+ private static final String ISSUER_MISMATCH = "eyJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJodHRwczpcL1wvd3Jvbmdpc3N1ZXIiLCJleHAiOjQ2ODcyNTYwNDl9.Ax8LMI6rhB9Pv_CE3kFi1JPuLj9gZycifWrLeDpkObWEEVAsIls9zAhNFyJlG-Oo7up6_mDhZgeRfyKnpSF5GhKJtXJDCzwg0ZDVUE6rS0QadSxsMMGbl7c4y0lG_7TfLX2iWeNJukJj_oSW9KzW4FsBp1BoocWjrreesqQU3fZHbikH-c_Fs2TsAIpHnxflyEzfOFWpJ8D4DtzHXqfvieMwpy42xsPZK3LR84zlasf0Ne1tC_hLHvyHRdAXwn0CMoKxc7-8j0r9Mq8kAzUsPn9If7bMLqGkxUcTPdk5x7opAUajDZx95SXHLmtztNtBa2S6EfPJXuPKG6tM5Wq5Ug";
+
+ private MockWebServer server;
+ private String issuer;
+ private String jwkSetUri;
+
+ @Before
+ public void setup() throws Exception {
+ this.server = new MockWebServer();
+ this.server.start();
+ this.issuer = createIssuerFromServer();
+ this.jwkSetUri = this.issuer + "/.well-known/jwks.json";
+ }
+
+ @After
+ public void cleanup() throws Exception {
+ this.server.shutdown();
+ }
+
+ @Test
+ public void issuerWhenResponseIsTypicalThenReturnedDecoderValidatesIssuer() {
+ prepareOpenIdConfigurationResponse();
+ this.server.enqueue(new MockResponse().setBody(JWK_SET));
+
+ JwtDecoder decoder = JwtDecoders.fromOidcIssuerLocation(this.issuer);
+
+ assertThatCode(() -> decoder.decode(ISSUER_MISMATCH))
+ .isInstanceOf(JwtValidationException.class)
+ .hasMessageContaining("This iss claim is not equal to the configured issuer");
+ }
+
+ @Test
+ public void issuerWhenResponseIsNonCompliantThenThrowsRuntimeException() {
+ prepareOpenIdConfigurationResponse("{ \"missing_required_keys\" : \"and_values\" }");
+
+ assertThatCode(() -> JwtDecoders.fromOidcIssuerLocation(this.issuer))
+ .isInstanceOf(RuntimeException.class);
+ }
+
+ @Test
+ public void issuerWhenResponseIsMalformedThenThrowsRuntimeException() {
+ prepareOpenIdConfigurationResponse("malformed");
+
+ assertThatCode(() -> JwtDecoders.fromOidcIssuerLocation(this.issuer))
+ .isInstanceOf(RuntimeException.class);
+ }
+
+ @Test
+ public void issuerWhenRespondingIssuerMismatchesRequestedIssuerThenThrowsIllegalStateException() {
+ prepareOpenIdConfigurationResponse();
+
+ assertThatCode(() -> JwtDecoders.fromOidcIssuerLocation(this.issuer + "/wrong"))
+ .isInstanceOf(IllegalStateException.class);
+ }
+
+ @Test
+ public void issuerWhenRequestedIssuerIsUnresponsiveThenThrowsIllegalArgumentException()
+ throws Exception {
+
+ this.server.shutdown();
+
+ assertThatCode(() -> JwtDecoders.fromOidcIssuerLocation("https://issuer"))
+ .isInstanceOf(IllegalArgumentException.class);
+ }
+
+ private void prepareOpenIdConfigurationResponse() {
+ String body = String.format(DEFAULT_RESPONSE_TEMPLATE, this.issuer, this.issuer);
+ prepareOpenIdConfigurationResponse(body);
+ }
+
+ private void prepareOpenIdConfigurationResponse(String body) {
+ MockResponse mockResponse = new MockResponse()
+ .setBody(body)
+ .setHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
+ this.server.enqueue(mockResponse);
+ }
+
+ private String createIssuerFromServer() {
+ return this.server.url("").toString();
+ }
+}