GUACAMOLE-1364: Extract common SSO resource for IdP redirect.

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-base/src/main/java/org/apache/guacamole/auth/sso/SSOAuthenticationProvider.java

@@ -24,6 +24,7 @@ import com.google.inject.AbstractModule;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
 import com.google.inject.Module;
+import com.google.inject.binder.LinkedBindingBuilder;
 import java.util.Arrays;
 import java.util.Collections;
 import org.apache.guacamole.GuacamoleException;
@@ -109,10 +110,18 @@ public abstract class SSOAuthenticationProvider extends AbstractAuthenticationPr
 
             @Override
             protected void configure() {
+
                 bind(AuthenticationProvider.class).toInstance(SSOAuthenticationProvider.this);
                 bind(Environment.class).toInstance(LocalEnvironment.getInstance());
                 bind(SSOAuthenticationProviderService.class).to(authService);
-                bind(SSOResource.class).to(ssoResource);
+
+                // Bind custom SSOResource implementation if different from
+                // core implementation (explicitly binding SSOResource as
+                // SSOResource results in a runtime error from Guice otherwise)
+                LinkedBindingBuilder<SSOResource> resourceBinding = bind(SSOResource.class);
+                if (ssoResource != SSOResource.class)
+                    resourceBinding.to(ssoResource);
+
             }
 
         }), modules));

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-base/src/main/java/org/apache/guacamole/auth/sso/SSOAuthenticationProviderService.java

@@ -19,6 +19,7 @@
 
 package org.apache.guacamole.auth.sso;
 
+import java.net.URI;
 import org.apache.guacamole.GuacamoleException;
 import org.apache.guacamole.auth.sso.user.SSOAuthenticatedUser;
 import org.apache.guacamole.net.auth.Credentials;
@@ -49,6 +50,19 @@ public interface SSOAuthenticationProviderService {
     SSOAuthenticatedUser authenticateUser(Credentials credentials)
             throws GuacamoleException;
 
+    /**
+     * Returns the full URI of the login endpoint to which a user must be
+     * redirected in order to authenticate with the SSO identity provider.
+     *
+     * @return 
+     *     The full URI of the SSO login endpoint.
+     *
+     * @throws GuacamoleException
+     *     If configuration information required for generating the login URI
+     *     cannot be read.
+     */
+    URI getLoginURI() throws GuacamoleException;
+
     /**
      * Frees all resources associated with the relevant
      * SSOAuthenticationProvider implementation. This function is automatically

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-base/src/main/java/org/apache/guacamole/auth/sso/SSOResource.java

@@ -18,6 +18,7 @@
  */
 package org.apache.guacamole.auth.sso;
 
+import com.google.inject.Inject;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
@@ -28,7 +29,13 @@ import org.apache.guacamole.GuacamoleException;
  * the applicable identity provider. Implementations may also provide
  * additional resources and endpoints beneath this resource as needed.
  */
-public interface SSOResource {
+public class SSOResource {
+
+    /**
+     * Service for authenticating users using CAS.
+     */
+    @Inject
+    private SSOAuthenticationProviderService authService;
 
     /**
      * Redirects the user to the relevant identity provider. If the SSO
@@ -44,6 +51,8 @@ public interface SSOResource {
      */
     @GET
     @Path("login")
-    public Response redirectToIdentityProvider() throws GuacamoleException;
+    public Response redirectToIdentityProvider() throws GuacamoleException {
+        return Response.seeOther(authService.getLoginURI()).build();
+    }
 
 }

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-cas/src/main/java/org/apache/guacamole/auth/cas/AuthenticationProviderService.java

@@ -90,17 +90,7 @@ public class AuthenticationProviderService implements SSOAuthenticationProviderS
 
     }
 
-    /**
-     * Returns the full URI of the CAS login endpoint to which a user must be
-     * redirected in order to authenticate and receive a CAS ticket.
-     *
-     * @return 
-     *     The full URI of the CAS login endpoint.
-     *
-     * @throws GuacamoleException
-     *     If configuration information required for generating the login URI
-     *     cannot be read.
-     */
+    @Override
     public URI getLoginURI() throws GuacamoleException {
         return UriBuilder.fromUri(confService.getAuthorizationEndpoint())
                 .path(CAS_LOGIN_URI)

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-cas/src/main/java/org/apache/guacamole/auth/cas/CASAuthenticationProvider.java

@@ -20,6 +20,7 @@
 package org.apache.guacamole.auth.cas;
 
 import org.apache.guacamole.auth.sso.SSOAuthenticationProvider;
+import org.apache.guacamole.auth.sso.SSOResource;
 
 /**
  * Guacamole authentication backend which authenticates users using an
@@ -35,7 +36,7 @@ public class CASAuthenticationProvider extends SSOAuthenticationProvider {
      */
     public CASAuthenticationProvider() {
         super(AuthenticationProviderService.class,
-                CASResource.class, new CASAuthenticationProviderModule());
+                SSOResource.class, new CASAuthenticationProviderModule());
     }
     
     @Override

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-cas/src/main/java/org/apache/guacamole/auth/cas/CASResource.java

@@ -1,43 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you 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.apache.guacamole.auth.cas;
-
-import com.google.inject.Inject;
-import javax.ws.rs.core.Response;
-import org.apache.guacamole.GuacamoleException;
-import org.apache.guacamole.auth.sso.SSOResource;
-
-/**
- * REST API resource that automatically redirects users to the CAS login
- * endpoint.
- */
-public class CASResource implements SSOResource {
-
-    /**
-     * Service for authenticating users using CAS.
-     */
-    @Inject
-    private AuthenticationProviderService authService;
-
-    @Override
-    public Response redirectToIdentityProvider() throws GuacamoleException {
-        return Response.seeOther(authService.getLoginURI()).build();
-    }
-
-}

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-openid/src/main/java/org/apache/guacamole/auth/openid/AuthenticationProviderService.java

@@ -120,17 +120,7 @@ public class AuthenticationProviderService implements SSOAuthenticationProviderS
 
     }
 
-    /**
-     * Returns the full URI of the OpenID login endpoint to which a user must
-     * be redirected in order to authenticate and receive an OpenID token.
-     *
-     * @return 
-     *     The full URI of the OpenID login endpoint, including unique nonce.
-     *
-     * @throws GuacamoleException
-     *     If configuration information required for generating the login URI
-     *     cannot be read.
-     */
+    @Override
     public URI getLoginURI() throws GuacamoleException {
         return UriBuilder.fromUri(confService.getAuthorizationEndpoint())
                 .queryParam("scope", confService.getScope())

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-openid/src/main/java/org/apache/guacamole/auth/openid/OpenIDAuthenticationProvider.java

@@ -20,6 +20,7 @@
 package org.apache.guacamole.auth.openid;
 
 import org.apache.guacamole.auth.sso.SSOAuthenticationProvider;
+import org.apache.guacamole.auth.sso.SSOResource;
 
 /**
  * Guacamole authentication backend which authenticates users using an
@@ -34,7 +35,7 @@ public class OpenIDAuthenticationProvider extends SSOAuthenticationProvider {
      * against an OpenID service.
      */
     public OpenIDAuthenticationProvider() {
-        super(AuthenticationProviderService.class, OpenIDResource.class,
+        super(AuthenticationProviderService.class, SSOResource.class,
                 new OpenIDAuthenticationProviderModule());
     }
 

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-openid/src/main/java/org/apache/guacamole/auth/openid/OpenIDResource.java

@@ -1,43 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you 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.apache.guacamole.auth.openid;
-
-import com.google.inject.Inject;
-import javax.ws.rs.core.Response;
-import org.apache.guacamole.GuacamoleException;
-import org.apache.guacamole.auth.sso.SSOResource;
-
-/**
- * REST API resource that automatically redirects users to the OpenID identity
- * provider.
- */
-public class OpenIDResource implements SSOResource {
-
-    /**
-     * Service for authenticating users using OpenID.
-     */
-    @Inject
-    private AuthenticationProviderService authService;
-
-    @Override
-    public Response redirectToIdentityProvider() throws GuacamoleException {
-        return Response.seeOther(authService.getLoginURI()).build();
-    }
-
-}

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-saml/src/main/java/org/apache/guacamole/auth/saml/AuthenticationProviderService.java

@@ -95,16 +95,20 @@ public class AuthenticationProviderService implements SSOAuthenticationProviderS
 
         // Redirect to SAML IdP if no SAML identity is associated with the
         // Guacamole authentication request
-        URI authUri = saml.createRequest();
         throw new GuacamoleInvalidCredentialsException("Redirecting to SAML IdP.",
                 new CredentialsInfo(Arrays.asList(new Field[] {
-                    new RedirectField(AUTH_SESSION_QUERY_PARAM, authUri,
+                    new RedirectField(AUTH_SESSION_QUERY_PARAM, getLoginURI(),
                             new TranslatableMessage("LOGIN.INFO_IDP_REDIRECT_PENDING"))
                 }))
         );
 
     }
 
+    @Override
+    public URI getLoginURI() throws GuacamoleException {
+        return saml.createRequest();
+    }
+
     @Override
     public void shutdown() {
         sessionManager.shutdown();

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-saml/src/main/java/org/apache/guacamole/auth/saml/acs/AssertionConsumerServiceResource.java

@@ -39,7 +39,7 @@ import org.slf4j.LoggerFactory;
  * endpoint. SAML identity providers will issue an HTTP POST to this endpoint
  * asserting the user's identity when the user has successfully authenticated.
  */
-public class AssertionConsumerServiceResource implements SSOResource {
+public class AssertionConsumerServiceResource extends SSOResource {
 
     /**
      * Logger for this class.
@@ -64,11 +64,6 @@ public class AssertionConsumerServiceResource implements SSOResource {
     @Inject
     private SAMLService saml;
 
-    @Override
-    public Response redirectToIdentityProvider() throws GuacamoleException {
-        return Response.seeOther(saml.createRequest()).build();
-    }
-
     /**
      * Processes the SAML response submitted by the SAML IdP via an HTTP POST.
      * If SSO has been successful, the user is redirected back to Guacamole to