Enhance OIDC Client to support the token revocation

docs/src/main/asciidoc/security-openid-connect-client-reference.adoc

@@ -495,6 +495,15 @@ If the access token needs to be refreshed but no refresh token is available then
 
 Please note that some OpenID Connect Providers will not return a refresh token in a `client_credentials` grant response. For example, starting from Keycloak 12 a refresh token will not be returned by default for `client_credentials`. The providers may also restrict a number of times a refresh token can be used.
 
+[[revoke-access-tokens]]
+=== Revoking Access Tokens
+
+If your OpenId Connect provider such as Keycloak supports a token revocation endpoint then `OidcClient#revokeAccessToken` can be used to revoke the current access token. The revocation endpoint URL will be discovered alongside the token request URI or can be configured with `quarkus.oidc-client.revoke-path`.
+
+You may want to have the access token revoked if using this token with a REST client fails with HTTP `401` or the access token has already been used for a long time and you'd like to refresh it.
+
+This can be achieved by requesting a token refresh using a refresh token. However, if the refresh token is not available then you can refresh it by revoking it first and then request a new access token.
+
 [[oidc-client-authentication]]
 === OidcClient Authentication
 

extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/OidcClient.java

@@ -29,4 +29,9 @@ default Uni<Tokens> getTokens() {
      * Refreshes the grant tokens
      */
     Uni<Tokens> refreshTokens(String refreshToken);
+
+    /**
+     * Revoke the access token
+     */
+    Uni<Void> revokeAccessToken(String accessToken);
 }

extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java

@@ -20,6 +20,7 @@
 import io.quarkus.oidc.common.runtime.OidcCommonUtils;
 import io.quarkus.oidc.common.runtime.OidcConstants;
 import io.smallrye.mutiny.Uni;
+import io.smallrye.mutiny.groups.UniOnItem;
 import io.vertx.core.http.HttpHeaders;
 import io.vertx.core.json.DecodeException;
 import io.vertx.core.json.JsonObject;
@@ -37,6 +38,7 @@ public class OidcClientImpl implements OidcClient {
 
     private final WebClient client;
     private final String tokenRequestUri;
+    private final String tokenRevokeUri;
     private final MultiMap tokenGrantParams;
     private final MultiMap commonRefreshGrantParams;
     private final String grantType;
@@ -45,10 +47,11 @@ public class OidcClientImpl implements OidcClient {
     private final OidcClientConfig oidcConfig;
     private volatile boolean closed;
 
-    public OidcClientImpl(WebClient client, String tokenRequestUri, String grantType,
+    public OidcClientImpl(WebClient client, String tokenRequestUri, String tokenRevokeUri, String grantType,
             MultiMap tokenGrantParams, MultiMap commonRefreshGrantParams, OidcClientConfig oidcClientConfig) {
         this.client = client;
         this.tokenRequestUri = tokenRequestUri;
+        this.tokenRevokeUri = tokenRevokeUri;
         this.tokenGrantParams = tokenGrantParams;
         this.commonRefreshGrantParams = commonRefreshGrantParams;
         this.grantType = grantType;
@@ -78,61 +81,88 @@ public Uni<Tokens> refreshTokens(String refreshToken) {
         return getJsonResponse(refreshGrantParams, Collections.emptyMap(), true);
     }
 
+    @Override
+    public Uni<Void> revokeAccessToken(String accessToken) {
+        checkClosed();
+        if (accessToken == null) {
+            throw new OidcClientException("Access token is null");
+        }
+        if (tokenRevokeUri != null) {
+            MultiMap tokenRevokeParams = new MultiMap(io.vertx.core.MultiMap.caseInsensitiveMultiMap());
+            tokenRevokeParams.set(OidcConstants.REVOCATION_TOKEN, accessToken);
+            return postRequest(tokenRevokeParams, Map.of(), false)
+                    .transformToUni(resp -> Uni.createFrom().voidItem());
+        } else {
+            LOG.debugf("%s OidcClient can not revoke the access token because the revocation endpoint URL is not set");
+            return Uni.createFrom().voidItem();
+        }
+
+    }
+
     private Uni<Tokens> getJsonResponse(MultiMap formBody, Map<String, String> additionalGrantParameters, boolean refresh) {
         //Uni needs to be lazy by default, we don't send the request unless
         //something has subscribed to it. This is important for the CAS state
         //management in TokensHelper
         return Uni.createFrom().deferred(new Supplier<Uni<? extends Tokens>>() {
             @Override
             public Uni<Tokens> get() {
-                MultiMap body = formBody;
-                HttpRequest<Buffer> request = client.postAbs(tokenRequestUri);
-                request.putHeader(HttpHeaders.CONTENT_TYPE.toString(),
-                        HttpHeaders.APPLICATION_X_WWW_FORM_URLENCODED.toString());
-                if (oidcConfig.headers != null) {
-                    for (Map.Entry<String, String> headerEntry : oidcConfig.headers.entrySet()) {
-                        request.putHeader(headerEntry.getKey(), headerEntry.getValue());
-                    }
-                }
-                if (clientSecretBasicAuthScheme != null) {
-                    request.putHeader(AUTHORIZATION_HEADER, clientSecretBasicAuthScheme);
-                } else if (clientJwtKey != null) {
-                    // if it is a refresh then a map has already been copied
-                    body = !refresh ? copyMultiMap(body) : body;
-                    String jwt = OidcCommonUtils.signJwtWithKey(oidcConfig, tokenRequestUri, clientJwtKey);
-
-                    if (OidcCommonUtils.isClientSecretPostJwtAuthRequired(oidcConfig.credentials)) {
-                        body.add(OidcConstants.CLIENT_ID, oidcConfig.clientId.get());
-                        body.add(OidcConstants.CLIENT_SECRET, jwt);
-                    } else {
-                        body.add(OidcConstants.CLIENT_ASSERTION_TYPE, OidcConstants.JWT_BEARER_CLIENT_ASSERTION_TYPE);
-                        body.add(OidcConstants.CLIENT_ASSERTION, jwt);
-                    }
-                } else if (!OidcCommonUtils.isClientSecretPostAuthRequired(oidcConfig.credentials)) {
-                    body = copyMultiMap(body).set(OidcConstants.CLIENT_ID, oidcConfig.clientId.get());
-                }
-                if (!additionalGrantParameters.isEmpty()) {
-                    body = copyMultiMap(body);
-                    for (Map.Entry<String, String> entry : additionalGrantParameters.entrySet()) {
-                        body.add(entry.getKey(), entry.getValue());
-                    }
-                }
-                // Retry up to three times with a one-second delay between the retries if the connection is closed
-                Uni<HttpResponse<Buffer>> response = request.sendBuffer(OidcCommonUtils.encodeForm(body))
-                        .onFailure(ConnectException.class)
-                        .retry()
-                        .atMost(oidcConfig.connectionRetryCount)
-                        .onFailure().transform(t -> {
-                            LOG.warn("OIDC Server is not available:", t.getCause() != null ? t.getCause() : t);
-                            // don't wrap t to avoid information leak
-                            return new OidcClientException("OIDC Server is not available");
-                        });
-                return response.onItem()
+                return postRequest(formBody, additionalGrantParameters, refresh)
                         .transform(resp -> emitGrantTokens(resp, refresh));
             }
         });
     }
 
+    private UniOnItem<HttpResponse<Buffer>> postRequest(MultiMap formBody, Map<String, String> additionalGrantParameters,
+            boolean refresh) {
+        MultiMap body = formBody;
+        HttpRequest<Buffer> request = client.postAbs(tokenRequestUri);
+        request.putHeader(HttpHeaders.CONTENT_TYPE.toString(),
+                HttpHeaders.APPLICATION_X_WWW_FORM_URLENCODED.toString());
+        if (oidcConfig.headers != null) {
+            for (Map.Entry<String, String> headerEntry : oidcConfig.headers.entrySet()) {
+                request.putHeader(headerEntry.getKey(), headerEntry.getValue());
+            }
+        }
+        if (clientSecretBasicAuthScheme != null) {
+            request.putHeader(AUTHORIZATION_HEADER, clientSecretBasicAuthScheme);
+        } else if (clientJwtKey != null) {
+            // if it is a refresh then a map has already been copied
+            body = !refresh ? copyMultiMap(body) : body;
+            String jwt = OidcCommonUtils.signJwtWithKey(oidcConfig, tokenRequestUri, clientJwtKey);
+
+            if (OidcCommonUtils.isClientSecretPostJwtAuthRequired(oidcConfig.credentials)) {
+                body.add(OidcConstants.CLIENT_ID, oidcConfig.clientId.get());
+                body.add(OidcConstants.CLIENT_SECRET, jwt);
+            } else {
+                body.add(OidcConstants.CLIENT_ASSERTION_TYPE, OidcConstants.JWT_BEARER_CLIENT_ASSERTION_TYPE);
+                body.add(OidcConstants.CLIENT_ASSERTION, jwt);
+            }
+        } else if (OidcCommonUtils.isClientSecretPostAuthRequired(oidcConfig.credentials)) {
+            body = !refresh ? copyMultiMap(body) : body;
+            body.set(OidcConstants.CLIENT_ID, oidcConfig.clientId.get());
+            body.set(OidcConstants.CLIENT_SECRET, OidcCommonUtils.clientSecret(oidcConfig.credentials));
+        } else {
+            body = copyMultiMap(body).set(OidcConstants.CLIENT_ID, oidcConfig.clientId.get());
+        }
+        if (!additionalGrantParameters.isEmpty()) {
+            body = copyMultiMap(body);
+            for (Map.Entry<String, String> entry : additionalGrantParameters.entrySet()) {
+                body.add(entry.getKey(), entry.getValue());
+            }
+        }
+        // Retry up to three times with a one-second delay between the retries if the connection is closed
+        Uni<HttpResponse<Buffer>> response = request.sendBuffer(OidcCommonUtils.encodeForm(body))
+                .onFailure(ConnectException.class)
+                .retry()
+                .atMost(oidcConfig.connectionRetryCount)
+                .onFailure().transform(t -> {
+                    LOG.warn("OIDC Server is not available:", t.getCause() != null ? t.getCause() : t);
+                    // don't wrap t to avoid information leak
+                    return new OidcClientException("OIDC Server is not available");
+                });
+        return response.onItem();
+    }
+
     private Tokens emitGrantTokens(HttpResponse<Buffer> resp, boolean refresh) {
         if (resp.statusCode() == 200) {
             LOG.debugf("%s OidcClient has %s the tokens", oidcConfig.getId().get(), (refresh ? "refreshed" : "acquired"));

extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientRecorder.java

@@ -16,7 +16,6 @@
 import io.quarkus.oidc.client.OidcClientException;
 import io.quarkus.oidc.client.OidcClients;
 import io.quarkus.oidc.client.Tokens;
-import io.quarkus.oidc.common.runtime.OidcCommonConfig.Credentials;
 import io.quarkus.oidc.common.runtime.OidcCommonUtils;
 import io.quarkus.oidc.common.runtime.OidcConstants;
 import io.quarkus.runtime.TlsConfig;
@@ -121,28 +120,32 @@ protected static Uni<OidcClient> createOidcClientUni(OidcClientConfig oidcConfig
 
         WebClient client = WebClient.create(new io.vertx.mutiny.core.Vertx(vertx.get()), options);
 
-        Uni<String> tokenRequestUriUni = null;
+        Uni<OidcConfigurationMetadata> tokenUrisUni = null;
         if (OidcCommonUtils.isAbsoluteUrl(oidcConfig.tokenPath)) {
-            tokenRequestUriUni = Uni.createFrom().item(oidcConfig.tokenPath.get());
+            tokenUrisUni = Uni.createFrom().item(
+                    new OidcConfigurationMetadata(oidcConfig.tokenPath.get(),
+                            OidcCommonUtils.isAbsoluteUrl(oidcConfig.revokePath) ? oidcConfig.revokePath.get() : null));
         } else {
             String authServerUriString = OidcCommonUtils.getAuthServerUrl(oidcConfig);
             if (!oidcConfig.discoveryEnabled.orElse(true)) {
-                tokenRequestUriUni = Uni.createFrom()
-                        .item(OidcCommonUtils.getOidcEndpointUrl(authServerUriString, oidcConfig.tokenPath));
+                tokenUrisUni = Uni.createFrom()
+                        .item(new OidcConfigurationMetadata(
+                                OidcCommonUtils.getOidcEndpointUrl(authServerUriString, oidcConfig.tokenPath),
+                                OidcCommonUtils.getOidcEndpointUrl(authServerUriString, oidcConfig.revokePath)));
             } else {
-                tokenRequestUriUni = discoverTokenRequestUri(client, authServerUriString.toString(), oidcConfig);
+                tokenUrisUni = discoverTokenUris(client, authServerUriString.toString(), oidcConfig);
             }
         }
-        return tokenRequestUriUni.onItemOrFailure()
-                .transform(new BiFunction<String, Throwable, OidcClient>() {
+        return tokenUrisUni.onItemOrFailure()
+                .transform(new BiFunction<OidcConfigurationMetadata, Throwable, OidcClient>() {
 
                     @Override
-                    public OidcClient apply(String tokenRequestUri, Throwable t) {
+                    public OidcClient apply(OidcConfigurationMetadata metadata, Throwable t) {
                         if (t != null) {
                             throw toOidcClientException(getEndpointUrl(oidcConfig), t);
                         }
 
-                        if (tokenRequestUri == null) {
+                        if (metadata.tokenRequestUri == null) {
                             throw new ConfigurationException(
                                     "OpenId Connect Provider token endpoint URL is not configured and can not be discovered");
                         }
@@ -182,7 +185,8 @@ public OidcClient apply(String tokenRequestUri, Throwable t) {
                         MultiMap commonRefreshGrantParams = new MultiMap(io.vertx.core.MultiMap.caseInsensitiveMultiMap());
                         setGrantClientParams(oidcConfig, commonRefreshGrantParams, OidcConstants.REFRESH_TOKEN_GRANT);
 
-                        return new OidcClientImpl(client, tokenRequestUri, grantType, tokenGrantParams,
+                        return new OidcClientImpl(client, metadata.tokenRequestUri, metadata.tokenRevokeUri, grantType,
+                                tokenGrantParams,
                                 commonRefreshGrantParams,
                                 oidcConfig);
                     }
@@ -196,20 +200,17 @@ private static String getEndpointUrl(OidcClientConfig oidcConfig) {
 
     private static void setGrantClientParams(OidcClientConfig oidcConfig, MultiMap grantParams, String grantType) {
         grantParams.add(OidcConstants.GRANT_TYPE, grantType);
-        Credentials creds = oidcConfig.getCredentials();
-        if (OidcCommonUtils.isClientSecretPostAuthRequired(creds)) {
-            grantParams.add(OidcConstants.CLIENT_ID, oidcConfig.clientId.get());
-            grantParams.add(OidcConstants.CLIENT_SECRET, OidcCommonUtils.clientSecret(creds));
-        }
         if (oidcConfig.getScopes().isPresent()) {
             grantParams.add(OidcConstants.TOKEN_SCOPE, oidcConfig.getScopes().get().stream().collect(Collectors.joining(" ")));
         }
     }
 
-    private static Uni<String> discoverTokenRequestUri(WebClient client, String authServerUrl, OidcClientConfig oidcConfig) {
+    private static Uni<OidcConfigurationMetadata> discoverTokenUris(WebClient client, String authServerUrl,
+            OidcClientConfig oidcConfig) {
         final long connectionDelayInMillisecs = OidcCommonUtils.getConnectionDelayInMillis(oidcConfig);
         return OidcCommonUtils.discoverMetadata(client, authServerUrl, connectionDelayInMillisecs)
-                .onItem().transform(json -> json.getString("token_endpoint"));
+                .onItem().transform(json -> new OidcConfigurationMetadata(json.getString("token_endpoint"),
+                        json.getString("revocation_endpoint")));
     }
 
     protected static OidcClientException toOidcClientException(String authServerUrlString, Throwable cause) {
@@ -233,8 +234,24 @@ public Uni<Tokens> refreshTokens(String refreshToken) {
             throw new DisabledOidcClientException(message);
         }
 
+        @Override
+        public Uni<Void> revokeAccessToken(String accessToken) {
+            throw new DisabledOidcClientException(message);
+        }
+
         @Override
         public void close() throws IOException {
         }
+
+    }
+
+    private static class OidcConfigurationMetadata {
+        private final String tokenRequestUri;
+        private final String tokenRevokeUri;
+
+        OidcConfigurationMetadata(String tokenRequestUri, String tokenRevokeUri) {
+            this.tokenRequestUri = tokenRequestUri;
+            this.tokenRevokeUri = tokenRevokeUri;
+        }
     }
 }

extensions/oidc-common/runtime/src/main/java/io/quarkus/oidc/common/runtime/OidcCommonConfig.java

@@ -32,6 +32,12 @@ public class OidcCommonConfig {
     @ConfigItem
     public Optional<String> tokenPath = Optional.empty();
 
+    /**
+     * Relative path or absolute URL of the OIDC token revocation endpoint.
+     */
+    @ConfigItem
+    public Optional<String> revokePath = Optional.empty();
+
     /**
      * The client-id of the application. Each application has a client-id that is used to identify the application
      */

extensions/oidc-common/runtime/src/main/java/io/quarkus/oidc/common/runtime/OidcConstants.java

@@ -27,6 +27,8 @@ public final class OidcConstants {
     public static final String INTROSPECTION_TOKEN_USERNAME = "username";
     public static final String INTROSPECTION_TOKEN_SUB = "sub";
 
+    public static final String REVOCATION_TOKEN = "token";
+
     public static final String PASSWORD_GRANT_USERNAME = "username";
     public static final String PASSWORD_GRANT_PASSWORD = "password";