Add http root to OIDC back channel logout handlers

(cherry picked from commit a17b30a)

Author: sberyozkin

extensions/oidc/runtime/src/main/java/io/quarkus/oidc/OidcTenantConfig.java

@@ -424,6 +424,8 @@ public void setFrontchannel(Frontchannel frontchannel) {
     public static class Backchannel {
         /**
          * The relative path of the Back-Channel Logout endpoint at the application.
+         * It must start with the forward slash '/', for example, '/back-channel-logout'.
+         * This value is always resolved relative to 'quarkus.http.root-path'.
          */
         @ConfigItem
         public Optional<String> path = Optional.empty();

extensions/oidc/runtime/src/main/java/io/quarkus/oidc/runtime/BackChannelLogoutHandler.java

@@ -13,6 +13,7 @@
 import io.quarkus.oidc.OidcTenantConfig;
 import io.quarkus.oidc.SecurityEvent;
 import io.quarkus.oidc.SecurityEvent.Type;
+import io.quarkus.oidc.common.runtime.OidcCommonUtils;
 import io.quarkus.oidc.common.runtime.OidcConstants;
 import io.quarkus.security.spi.runtime.SecurityEventHelper;
 import io.vertx.core.Handler;
@@ -24,6 +25,7 @@
 
 public class BackChannelLogoutHandler {
     private static final Logger LOG = Logger.getLogger(BackChannelLogoutHandler.class);
+    private static final String SLASH = "/";
 
     @Inject
     DefaultTenantConfigResolver resolver;
@@ -44,7 +46,8 @@ public void setup(@Observes Router router) {
 
     private void addRoute(Router router, OidcTenantConfig oidcTenantConfig) {
         if (oidcTenantConfig.isTenantEnabled() && oidcTenantConfig.logout.backchannel.path.isPresent()) {
-            router.route(oidcTenantConfig.logout.backchannel.path.get()).handler(new RouteHandler(oidcTenantConfig));
+            router.route(getRootPath() + oidcTenantConfig.logout.backchannel.path.get())
+                    .handler(new RouteHandler(oidcTenantConfig));
         }
     }
 
@@ -160,7 +163,18 @@ private TenantConfigContext getTenantConfigContext(RoutingContext context) {
         private boolean isMatchingTenant(String requestPath, TenantConfigContext tenant) {
             return tenant.oidcConfig.isTenantEnabled()
                     && tenant.oidcConfig.getTenantId().get().equals(oidcTenantConfig.getTenantId().get())
-                    && requestPath.equals(tenant.oidcConfig.logout.backchannel.path.orElse(null));
+                    && requestPath.equals(getRootPath() + tenant.oidcConfig.logout.backchannel.path.orElse(null));
         }
     }
+
+    private String getRootPath() {
+        // Prepend '/' if it is not present
+        String rootPath = OidcCommonUtils.prependSlash(resolver.getRootPath());
+        // Strip trailing '/' if the length is > 1
+        if (rootPath.length() > 1 && rootPath.endsWith("/")) {
+            rootPath = rootPath.substring(rootPath.length() - 1);
+        }
+        // if it is only '/' then return an empty value
+        return SLASH.equals(rootPath) ? "" : rootPath;
+    }
 }

extensions/oidc/runtime/src/main/java/io/quarkus/oidc/runtime/DefaultTenantConfigResolver.java

@@ -51,6 +51,7 @@ public class DefaultTenantConfigResolver {
     private final TenantConfigBean tenantConfigBean;
     private final TenantResolver[] staticTenantResolvers;
     private final boolean annotationBasedTenantResolutionEnabled;
+    private final String rootPath;
 
     @Inject
     Instance<TenantConfigResolver> tenantConfigResolver;
@@ -86,6 +87,7 @@ public class DefaultTenantConfigResolver {
         this.staticTenantResolvers = prepareStaticTenantResolvers(tenantConfigBean, rootPath, tenantResolverInstance,
                 resolveTenantsWithIssuer, new DefaultStaticTenantResolver());
         this.annotationBasedTenantResolutionEnabled = Boolean.getBoolean(OidcUtils.ANNOTATION_BASED_TENANT_RESOLUTION_ENABLED);
+        this.rootPath = rootPath;
     }
 
     @PostConstruct
@@ -414,6 +416,10 @@ public OidcTenantConfig getResolvedConfig(String sessionTenantId) {
         return null;
     }
 
+    public String getRootPath() {
+        return rootPath;
+    }
+
     private static final class IssuerBasedTenantResolver implements TenantResolver {
 
         private final TenantConfigContext[] tenantConfigContexts;