Add ODD IAM Logout handler (#1214)

odd-platform-api/src/main/java/org/opendatadiscovery/oddplatform/auth/logout/ODDIAMLogoutSuccessHandler.java

@@ -0,0 +1,47 @@
+package org.opendatadiscovery.oddplatform.auth.logout;
+
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import lombok.RequiredArgsConstructor;
+import org.opendatadiscovery.oddplatform.auth.ODDOAuth2Properties;
+import org.opendatadiscovery.oddplatform.auth.Provider;
+import org.opendatadiscovery.oddplatform.auth.condition.ODDIAMCondition;
+import org.opendatadiscovery.oddplatform.auth.util.UriUtils;
+import org.springframework.context.annotation.Conditional;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.web.server.WebFilterExchange;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.WebSession;
+import org.springframework.web.util.UriComponentsBuilder;
+import reactor.core.publisher.Mono;
+
+@Component
+@Conditional(ODDIAMCondition.class)
+@RequiredArgsConstructor
+public class ODDIAMLogoutSuccessHandler implements LogoutSuccessHandler {
+    @Override
+    public boolean shouldHandle(final String provider) {
+        return provider.equalsIgnoreCase(Provider.ODD_IAM.name());
+    }
+
+    @Override
+    public Mono<Void> handle(final WebFilterExchange exchange,
+                             final Authentication authentication,
+                             final ODDOAuth2Properties.OAuth2Provider provider) {
+        final ServerHttpResponse response = exchange.getExchange().getResponse();
+        response.setStatusCode(HttpStatus.FOUND);
+        final var requestUri = exchange.getExchange().getRequest().getURI();
+
+        final var uri = UriComponentsBuilder
+            .fromUri(URI.create(String.format("%s/oauth2/logout", provider.getIssuerUri())))
+            .queryParam("logout_uri", UriUtils.getBaseUri(requestUri))
+            .encode(StandardCharsets.UTF_8)
+            .build()
+            .toUri();
+
+        response.getHeaders().setLocation(uri);
+        return exchange.getExchange().getSession().flatMap(WebSession::invalidate);
+    }
+}