Set up a unified registry servlet for Jetty (#2338)

This PR creates a unified RegistryServlet that will serve all
non-console traffic. It also creates a jetty subproject that allows one
to run Nomulus on top of a standard Jetty 12 runtime.

`./gradlew :jetty:stage` will create a jetty base folder at
`jetty/build/jetty-base` where one is able spin up a local Nomulus server
by running the following command inside the folder:

```bash
java -jar ${JETTY_HOME}/start.jar
```

`JETTY_HOME` is a folder where the [Jetty runtime](https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-home/12.0.6/jetty-home-12.0.6.zip) is located.

This PR also adds a Gradle task to create a Nomulus image based on the
official Jetty image:

```bash
./gradlew :jetty:buildNomulusImage
```

jetty/Dockerfile

@@ -0,0 +1,7 @@
+FROM jetty:12-jdk17
+ADD --chown=jetty:jetty build/jetty-base /jetty-base
+ENV JETTY_BASE=/jetty-base
+WORKDIR "$JETTY_BASE"
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "/usr/local/jetty/start.jar"]
+

jetty/build.gradle

@@ -0,0 +1,52 @@
+// Copyright 2024 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed 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.
+
+apply plugin: 'war'
+
+tasks.register('copyJettyBase', Copy) {
+    from(layout.projectDirectory.dir('src/main')) {
+        include 'jetty-base/**'
+    }
+    into layout.buildDirectory
+}
+
+war {
+    setArchiveBaseName("root")
+    setDestinationDirectory(layout.buildDirectory.dir('jetty-base/webapps'))
+    dependsOn(tasks.named('copyJettyBase'))
+}
+
+dependencies {
+    implementation project(':core')
+}
+
+tasks.register('copyConsole', Copy) {
+    from("${rootDir}/console-webapp/dist/console-webapp") {
+        include "**/*"
+    }
+    into layout.buildDirectory.dir('jetty-base/webapps/console')
+    dependsOn(':console-webapp:buildConsoleWebappProd')
+}
+
+tasks.register('stage') {
+    dependsOn(tasks.named('war'))
+    dependsOn(tasks.named('copyConsole'))
+}
+
+tasks.register('buildNomulusImage', Exec) {
+    commandLine 'docker', 'build', '-t', 'nomulus', '.'
+    dependsOn(tasks.named('stage'))
+}
+
+project.build.dependsOn(tasks.named('buildNomulusImage'))

jetty/src/main/jetty-base/resources/jetty-logging.properties

@@ -0,0 +1,10 @@
+## Set logging levels from: ALL, TRACE, DEBUG, INFO, WARN, ERROR, OFF
+org.eclipse.jetty.LEVEL=INFO
+## Configure a level for an arbitrary logger tree
+#com.example.LEVEL=INFO
+## Configure a level for specific logger
+#com.example.MyComponent.LEVEL=INFO
+## Configure JMX Context Name
+# org.eclipse.jetty.logging.jmx.context=JettyServer
+## Hide stacks traces in an arbitrary logger tree
+#com.example.STACKS=false

jetty/src/main/jetty-base/start.d/ee8-deploy.ini

@@ -0,0 +1,36 @@
+# --------------------------------------- 
+# Module: ee8-deploy
+# This module enables webapp deployment from the `$JETTY_BASE/webapps` directory.
+# --------------------------------------- 
+--modules=ee8-deploy
+
+## Monitored directory name (relative to $jetty.base)
+# jetty.deploy.monitoredDir=webapps
+
+## Defaults Descriptor for all deployed webapps
+# jetty.deploy.defaultsDescriptorPath=${jetty.base}/etc/webdefault-ee8.xml
+
+## Monitored directory scan period (seconds)
+jetty.deploy.scanInterval=1
+
+## Whether to extract *.war files
+# jetty.deploy.extractWars=true
+
+## Whether to give the parent classloader priority
+# jetty.deploy.parentLoaderPriority=true
+
+## Comma separated list of configuration classes to set.
+# jetty.deploy.configurationClasses=
+
+## Pattern to select jars from the container classloader to be scanned (or null to scan no jars)
+# jetty.deploy.containerScanJarPattern=.*/jetty-servlet-api-[^/]*\.jar$|.*/javax.servlet.jsp.jstl-.*\.jar$
+
+## Pattern to select jars from the container classloader to be scanned (or null to scan all jars).
+# jetty.deploy.webInfScanJarPattern=
+
+## Pattern to exclude discovered ServletContainerInitializers
+# jetty.deploy.servletContainerInitializerExclusionPattern=
+
+## Order of discovered ServletContainerInitializers
+# jetty.deploy.servletContainerInitializerOrder=
+

jetty/src/main/jetty-base/start.d/http.ini

@@ -0,0 +1,47 @@
+# --------------------------------------- 
+# Module: http
+# Enables a clear-text HTTP connector.
+# By default clear-text HTTP/1.1 is enabled, and clear-text HTTP/2 may be added by enabling the "http2c" module.
+# --------------------------------------- 
+--modules=http
+
+### Clear-Text HTTP Connector Configuration
+
+## The host/address to bind the connector to.
+jetty.http.host=0.0.0.0
+
+## The port the connector listens on.
+# jetty.http.port=8080
+
+## The connector idle timeout, in milliseconds.
+# jetty.http.idleTimeout=30000
+
+## The number of acceptors (-1 picks a default value based on number of cores).
+# jetty.http.acceptors=1
+
+## The number of selectors (-1 picks a default value based on number of cores).
+# jetty.http.selectors=-1
+
+## The ServerSocketChannel accept queue backlog (0 picks the platform default).
+# jetty.http.acceptQueueSize=0
+
+## The thread priority delta to give to acceptor threads.
+# jetty.http.acceptorPriorityDelta=0
+
+## Whether to enable the SO_REUSEADDR socket option.
+# jetty.http.reuseAddress=true
+
+## Whether to enable the SO_REUSEPORT socket option.
+# jetty.http.reusePort=false
+
+## Whether to enable the TCP_NODELAY socket option on accepted sockets.
+# jetty.http.acceptedTcpNoDelay=true
+
+## The SO_RCVBUF socket option to set on accepted sockets.
+## A value of -1 indicates that the platform default is used.
+# jetty.http.acceptedReceiveBufferSize=-1
+
+## The SO_SNDBUF socket option to set on accepted sockets.
+## A value of -1 indicates that the platform default is used.
+# jetty.http.acceptedSendBufferSize=-1
+

jetty/src/main/jetty-base/start.d/server.ini

@@ -0,0 +1,100 @@
+# --------------------------------------- 
+# Module: server
+# Enables and configures the Jetty server.
+# This module does not enable any network protocol support.
+# To enable a specific network protocol such as HTTP/1.1, you must enable the correspondent Jetty module.
+# --------------------------------------- 
+--modules=server
+
+### Common HTTP configuration
+## Scheme to use to build URIs for secure redirects
+# jetty.httpConfig.secureScheme=https
+
+## Port to use to build URIs for secure redirects
+# jetty.httpConfig.securePort=8443
+
+## Response content buffer size (in bytes)
+# jetty.httpConfig.outputBufferSize=32768
+
+## Max response content write length that is buffered (in bytes)
+# jetty.httpConfig.outputAggregationSize=8192
+
+## If HTTP/1.x persistent connections should be enabled
+# jetty.httpConfig.persistentConnectionsEnabled=true
+
+## Max request headers size (in bytes)
+# jetty.httpConfig.requestHeaderSize=8192
+
+## Max response headers size (in bytes)
+# jetty.httpConfig.responseHeaderSize=8192
+
+## Whether to send the Server: header
+# jetty.httpConfig.sendServerVersion=true
+
+## Whether to send the Date: header
+# jetty.httpConfig.sendDateHeader=false
+
+## Max per-connection header cache size (in nodes)
+# jetty.httpConfig.headerCacheSize=1024
+
+## Whether, for requests with content, delay dispatch until some content has arrived
+# jetty.httpConfig.delayDispatchUntilContent=true
+
+## Maximum number of error dispatches to prevent looping
+# jetty.httpConfig.maxErrorDispatches=10
+
+## Relative Redirect Locations allowed
+# jetty.httpConfig.relativeRedirectAllowed=true
+
+## Whether to use direct ByteBuffers for reading or writing
+# jetty.httpConfig.useInputDirectByteBuffers=true
+# jetty.httpConfig.useOutputDirectByteBuffers=true
+
+## HTTP Compliance: RFC7230, RFC7230_LEGACY, RFC2616, RFC2616_LEGACY, LEGACY
+# jetty.httpConfig.compliance=RFC7230
+
+## URI Compliance: DEFAULT, LEGACY, RFC3986, RFC3986_UNAMBIGUOUS, UNSAFE
+# jetty.httpConfig.uriCompliance=DEFAULT
+
+## Cookie compliance mode for parsing request Cookie headers: RFC6265_STRICT, RFC6265, RFC6265_LEGACY, RFC2965, RFC2965_LEGACY
+# jetty.httpConfig.requestCookieCompliance=RFC6265
+
+## Cookie compliance mode for generating response Set-Cookie: RFC2965, RFC6265
+# jetty.httpConfig.responseCookieCompliance=RFC6265
+
+### Server configuration
+## Whether ctrl+c on the console gracefully stops the Jetty server
+# jetty.server.stopAtShutdown=true
+
+## Timeout in ms to apply when stopping the server gracefully
+# jetty.server.stopTimeout=5000
+
+## Dump the state of the Jetty server, components, and webapps after startup
+# jetty.server.dumpAfterStart=false
+
+## The temporary directory used by the Jetty server and as a root for its contexts
+# jetty.server.tempDirectory=
+
+## Dump the state of the Jetty server, components, and webapps before shutdown
+# jetty.server.dumpBeforeStop=false
+
+### Server Scheduler Configuration
+## The scheduler thread name, defaults to "Scheduler-{hashCode()}" if blank.
+# jetty.scheduler.name=
+
+## Whether the server scheduler threads are daemon.
+# jetty.scheduler.daemon=false
+
+## The number of server scheduler threads.
+# jetty.scheduler.threads=1
+
+## Whether the handlers of the ContextHandlerCollection can be updated once the server is started
+## If set to false, then eeN-deploy module jetty.deploy.scanInterval should also be set to 0.
+# jetty.server.contexts.dynamic=true
+
+## Should the DefaultHandler serve the jetty favicon.ico from the root.
+# jetty.server.default.serveFavIcon=true
+
+## Should the DefaultHandler show a list of known contexts in a root 404 response.
+# jetty.server.default.showContexts=true
+

jetty/src/main/webapp/WEB-INF/web.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
+                             http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
+  <!-- Servlets -->
+
+  <!-- Servlet for injected frontend actions -->
+  <servlet>
+    <servlet-name>registry</servlet-name>
+    <servlet-class>google.registry.module.RegistryServlet</servlet-class>
+    <load-on-startup>1</load-on-startup>
+  </servlet>
+
+  <!-- The Nomulus registry servlet. -->
+  <servlet-mapping>
+    <servlet-name>registry</servlet-name>
+    <url-pattern>/*</url-pattern>
+  </servlet-mapping>
+</web-app>