Examples of io.undertow.server.HttpHandler

io.undertow.server.HttpHandler
A handler for an HTTP request. The request handler must eventually either call another handler or end the exchange. @author David M. Lloyd


        final IdentityManager identityManager = new MapIdentityManager(users);


        Undertow server = Undertow.builder()
                .addListener(8080, "localhost")
                .setHandler(addSecurity(new HttpHandler() {
                    @Override
                    public void handleRequest(final HttpServerExchange exchange) throws Exception {
                        final SecurityContext context = exchange.getSecurityContext();
                        exchange.getResponseSender().send("Hello " + context.getAuthenticatedAccount().getPrincipal().getName(), IoCallback.END_EXCHANGE);
                    }

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public class HelloWorldServer {


    public static void main(final String[] args) {
        Undertow server = Undertow.builder()
                .addListener(8080, "localhost")
                .setHandler(new HttpHandler() {
                    @Override
                    public void handleRequest(final HttpServerExchange exchange) throws Exception {
                        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                        exchange.getResponseSender().send("Hello World");
                    }

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                .build();
        server.start();
    }


    private static HttpHandler addSecurity(final HttpHandler toWrap, final IdentityManager identityManager) {
        HttpHandler handler = toWrap;
        handler = new AuthenticationCallHandler(handler);
        handler = new AuthenticationConstraintHandler(handler);
        final List<AuthenticationMechanism> mechanisms = Collections.<AuthenticationMechanism>singletonList(new BasicAuthenticationMechanism("My Realm"));
        handler = new AuthenticationMechanismsHandler(handler, mechanisms);
        handler = new SecurityInitialHandler(AuthenticationMode.PRO_ACTIVE, identityManager, handler);

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                    boolean defaultServletMatch = targetServletMatch.defaultServlet;
                    if (defaultServletMatch && extensionServlets.containsKey(entry.getKey())) {
                        defaultServletMatch = false;
                        pathServlet = extensionServlets.get(entry.getKey());
                    }
                    HttpHandler handler = pathServlet;
                    if (!entry.getValue().isEmpty()) {
                        handler = new FilterHandler(entry.getValue(), deploymentInfo.isAllowNonStandardWrappers(), handler);
                    }
                    builder.addExtensionMatch(prefix, entry.getKey(), servletChain(handler, pathServlet.getManagedServlet(), pathMatch, deploymentInfo, defaultServletMatch));
                }

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        }
        list.add(value);
    }


    private static ServletChain servletChain(HttpHandler next, final ManagedServlet managedServlet, final String servletPath, final DeploymentInfo deploymentInfo, boolean defaultServlet) {
        HttpHandler servletHandler = new ServletSecurityRoleHandler(next, deploymentInfo.getPrincipalVersusRolesMap());
        servletHandler = wrapHandlers(servletHandler, managedServlet.getServletInfo().getHandlerChainWrappers());
        return new ServletChain(servletHandler, managedServlet, servletPath, defaultServlet);
    }

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        servletHandler = wrapHandlers(servletHandler, managedServlet.getServletInfo().getHandlerChainWrappers());
        return new ServletChain(servletHandler, managedServlet, servletPath, defaultServlet);
    }


    private static HttpHandler wrapHandlers(final HttpHandler wrapee, final List<HandlerWrapper> wrappers) {
        HttpHandler current = wrapee;
        for (HandlerWrapper wrapper : wrappers) {
            current = wrapper.wrap(current);
        }
        return current;
    }

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            initializeMimeMappings(deployment, deploymentInfo);
            initializeTempDir(servletContext, deploymentInfo);
            listeners.contextInitialized();
            //run


            HttpHandler wrappedHandlers = ServletDispatchingHandler.INSTANCE;
            wrappedHandlers = wrapHandlers(wrappedHandlers, deploymentInfo.getInnerHandlerChainWrappers());
            HttpHandler securityHandler = setupSecurityHandlers(wrappedHandlers);
            wrappedHandlers = new PredicateHandler(DispatcherTypePredicate.REQUEST, securityHandler, wrappedHandlers);


            HttpHandler outerHandlers = wrapHandlers(wrappedHandlers, deploymentInfo.getOuterHandlerChainWrappers());
            wrappedHandlers = new PredicateHandler(DispatcherTypePredicate.REQUEST, outerHandlers, wrappedHandlers);


            final ServletInitialHandler servletInitialHandler = new ServletInitialHandler(deployment.getServletPaths(), wrappedHandlers, deployment.getThreadSetupAction(), servletContext);




            HttpHandler initialHandler = wrapHandlers(servletInitialHandler, deployment.getDeploymentInfo().getInitialHandlerChainWrappers());
            initialHandler = new HttpContinueReadHandler(initialHandler);
            initialHandler = handleDevelopmentModePersistentSessions(initialHandler, deploymentInfo, deployment.getSessionManager(), servletContext);
            if(deploymentInfo.getUrlEncoding() != null) {
                initialHandler = Handlers.urlDecodingHandler(deploymentInfo.getUrlEncoding(), initialHandler);
            }

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     */
    private HttpHandler setupSecurityHandlers(HttpHandler initialHandler) {
        final DeploymentInfo deploymentInfo = deployment.getDeploymentInfo();
        final LoginConfig loginConfig = deploymentInfo.getLoginConfig();


        HttpHandler current = initialHandler;
        current = new SSLInformationAssociationHandler(current);


        final SecurityPathMatches securityPathMatches = buildSecurityConstraints();
        current = new AuthenticationCallHandler(current);
        if (!securityPathMatches.isEmpty()) {

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        return new ApplicationListeners(managedListeners, deployment.getServletContext());
    }




    private static HttpHandler wrapHandlers(final HttpHandler wrapee, final List<HandlerWrapper> wrappers) {
        HttpHandler current = wrapee;
        for (HandlerWrapper wrapper : wrappers) {
            current = wrapper.wrap(current);
        }
        return current;
    }

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            executor = servletContext.getDeployment().getExecutor();
        }


        if (exchange.isInIoThread() || executor != null) {
            //either the exchange has not been dispatched yet, or we need to use a special executor
            exchange.dispatch(executor, new HttpHandler() {
                @Override
                public void handleRequest(final HttpServerExchange exchange) throws Exception {
                    if(System.getSecurityManager() == null) {
                        dispatchRequest(exchange, servletRequestContext, info.getServletChain(), DispatcherType.REQUEST);
                    } else {

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