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package org.glassfish.jersey.servlet.init;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.Path;
import javax.ws.rs.core.Application;
import javax.ws.rs.ext.Provider;
import javax.servlet.Registration;
import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import javax.servlet.annotation.HandlesTypes;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.servlet.ServletContainer;
import org.glassfish.jersey.servlet.ServletProperties;
import org.glassfish.jersey.servlet.WebComponent;
import org.glassfish.jersey.servlet.init.internal.LocalizationMessages;
import org.glassfish.jersey.servlet.internal.ServletContainerProviderFactory;
import org.glassfish.jersey.servlet.internal.spi.ServletContainerProvider;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
/*
It is RECOMMENDED that implementations support the Servlet 3 framework
pluggability mechanism to enable portability between containers and to avail
themselves of container-supplied class scanning facilities.
When using the pluggability mechanism the following conditions MUST be met:
- If no Application subclass is present the added servlet MUST be
named "javax.ws.rs.core.Application" and all root resource classes and
providers packaged in the web application MUST be included in the published
JAX-RS application. The application MUST be packaged with a web.xml that
specifies a servlet mapping for the added servlet.
- If an Application subclass is present and there is already a servlet defined
that has a servlet initialization parameter named "javax.ws.rs.Application"
whose value is the fully qualified name of the Application subclass then no
servlet should be added by the JAX-RS implementation's ContainerInitializer
since the application is already being handled by an existing servlet.
- If an application subclass is present that is not being handled by an
existing servlet then the servlet added by the ContainerInitializer MUST be
named with the fully qualified name of the Application subclass. If the
Application subclass is annotated with @PathPrefix and no servlet-mapping
exists for the added servlet then a new servlet mapping is added with the
value of the @PathPrefix annotation with "/*" appended otherwise the existing
mapping is used. If the Application subclass is not annotated with @PathPrefix
then the application MUST be packaged with a web.xml that specifies a servlet
mapping for the added servlet. It is an error for more than one Application
to be deployed at the same effective servlet mapping.
In either of the latter two cases, if both Application#getClasses and
Application#getSingletons return an empty list then all root resource classes
and providers packaged in the web application MUST be included in the
published JAX-RS application. If either getClasses or getSingletons return a
non-empty list then only those classes or singletons returned MUST be included
in the published JAX-RS application.
If not using the Servlet 3 framework pluggability mechanism
(e.g. in a pre-Servlet 3.0 container), the servlet-class or filter-class
element of the web.xml descriptor SHOULD name the JAX-RS
implementation-supplied Servlet or Filter class respectively. The
application-supplied subclass of Application SHOULD be identified using an
init-param with a param-name of javax.ws.rs.Application.
*/
/**
* {@link ServletContainerInitializer} implementation used for Servlet 3.x deployment.
*
* @author Paul Sandoz
* @author Martin Matula (martin.matula at oracle.com)
* @author Libor Kramolis (libor.kramolis at oracle.com)
*/
@HandlesTypes({Path.class, Provider.class, Application.class, ApplicationPath.class})
public class JerseyServletContainerInitializer implements ServletContainerInitializer {
private static final Logger LOGGER = Logger.getLogger(JerseyServletContainerInitializer.class.getName());
@Override
public void onStartup(Set> classes, ServletContext servletContext) throws ServletException {
final ServletContainerProvider[] allServletContainerProviders = //TODO check if META-INF/services lookup is enabled
ServletContainerProviderFactory.getAllServletContainerProviders();
for (ServletContainerProvider servletContainerProvider : allServletContainerProviders) {
servletContainerProvider.init(servletContext);
}
String[] servletNames = onStartupImpl(classes, servletContext);
for (ServletContainerProvider servletContainerProvider : allServletContainerProviders) {
servletContainerProvider.onRegister(servletContext, servletNames);
}
}
private String[] onStartupImpl(Set> classes, final ServletContext servletContext) throws ServletException {
Set servletNames = new HashSet();
if (classes == null) {
classes = Collections.emptySet();
}
// first see if there are any application classes in the web app
for (Class applicationClass : getApplicationClasses(classes)) {
final ServletRegistration servletRegistration = servletContext.getServletRegistration(applicationClass.getName());
if (servletRegistration != null) {
addNotNull(servletNames,
addServletWithExistingRegistration(servletContext, servletRegistration, applicationClass, classes));
} else {
// Servlet is not registered with app name or the app name is used to register a different servlet
// check if some servlet defines the app in init params
List srs = getInitParamDeclaredRegistrations(servletContext, applicationClass);
if (!srs.isEmpty()) {
// app handled by at least one servlet or filter
// fix the registrations if needed (i.e. add servlet class)
for (Registration sr : srs) {
if (sr instanceof ServletRegistration) {
addNotNull(servletNames,
addServletWithExistingRegistration(servletContext, (ServletRegistration) sr, applicationClass, classes));
}
}
} else {
// app not handled by any servlet/filter -> add it
addNotNull(servletNames,
addServletWithApplication(servletContext, applicationClass, classes));
}
}
}
// check for javax.ws.rs.core.Application registration
addNotNull(servletNames,
addServletWithDefaultConfiguration(servletContext, classes));
collectJerseyServletNames(servletContext, servletNames);
return servletNames.toArray(new String[servletNames.size()]);
}
/**
* Adds all Jersey servlets configured in {@code web.xml} to the set of servlet names ({@code servletNames}).
*
* @param servletContext the {@link ServletContext} of the web application that is being started
* @param servletNames set of programmatically registered Jersey servlet names, that will be enhanced
*/
private static void collectJerseyServletNames(ServletContext servletContext, Set servletNames) {
for (ServletRegistration servletRegistration : servletContext.getServletRegistrations().values()) {
if (isJerseyServlet(servletRegistration.getClassName())) {
servletNames.add(servletRegistration.getName());
}
}
}
/**
* Check if the {@code className} is an implementation of a Jersey Servlet container.
*
* @return {@code true} if the class is a Jersey servlet container class, {@code false} otherwise.
*/
private static boolean isJerseyServlet(String className) {
return ServletContainer.class.getName().equals(className) ||
"org.glassfish.jersey.servlet.portability.PortableServletContainer".equals(className);
}
private List getInitParamDeclaredRegistrations(ServletContext sc, Class a) {
final List srs = Lists.newArrayList();
collectJaxRsRegistrations(sc.getServletRegistrations(), srs, a);
collectJaxRsRegistrations(sc.getFilterRegistrations(), srs, a); //??? LKR: I guess FilterRegistration is not used further
return srs;
}
private void collectJaxRsRegistrations(Map registrations,
List collected, Class a) {
for (Registration sr : registrations.values()) {
Map ips = sr.getInitParameters();
if (ips.containsKey(ServletProperties.JAXRS_APPLICATION_CLASS)) {
if (ips.get(ServletProperties.JAXRS_APPLICATION_CLASS).equals(a.getName())) {
collected.add(sr);
}
}
}
}
/**
* Enhance default servlet (named {@link Application}) configuration.
*
* @return Servlet name or null if no servlet added
*/
private String addServletWithDefaultConfiguration(final ServletContext sc, final Set> classes)
throws ServletException {
String servletName = null;
ServletRegistration appReg = sc.getServletRegistration(Application.class.getName());
if (appReg != null && appReg.getClassName() == null) {
final Set> appClasses = getRootResourceAndProviderClasses(classes);
final ResourceConfig resourceConfig = ResourceConfig.forApplicationClass(ResourceConfig.class, appClasses)
.addProperties(getInitParams(appReg))
.addProperties(WebComponent.getContextParams(sc));
final ServletContainer s = new ServletContainer(resourceConfig);
servletName = appReg.getName();
appReg = sc.addServlet(servletName, s);
((ServletRegistration.Dynamic) appReg).setLoadOnStartup(1);
if (appReg.getMappings().isEmpty()) {
// Error
LOGGER.log(Level.SEVERE, LocalizationMessages.JERSEY_APP_NO_MAPPING(appReg.getName()));
} else {
LOGGER.log(Level.INFO, LocalizationMessages.JERSEY_APP_REGISTERED_CLASSES(appReg.getName(), appClasses));
}
}
return servletName;
}
/**
* Add new servlet according {@link Application} subclass with {@link ApplicationPath} annotation.
*
* @return Servlet name or null if no servlet added
*/
private String addServletWithApplication(final ServletContext sc, final Class a,
final Set> classes)
throws ServletException {
String servletName = null;
final ApplicationPath ap = a.getAnnotation(ApplicationPath.class);
if (ap != null) {
// App is annotated with ApplicationPath
final ResourceConfig resourceConfig = ResourceConfig.forApplicationClass(a, classes);
final ServletContainer s = new ServletContainer(resourceConfig);
servletName = a.getName();
final ServletRegistration.Dynamic dsr = sc.addServlet(servletName, s);
dsr.setAsyncSupported(true);
dsr.setLoadOnStartup(1);
final String mapping = createMappingPath(ap);
if (!mappingExists(sc, mapping)) {
dsr.addMapping(mapping);
LOGGER.log(Level.INFO, LocalizationMessages.JERSEY_APP_REGISTERED_MAPPING(a.getName(), mapping));
} else {
LOGGER.log(Level.SEVERE, LocalizationMessages.JERSEY_APP_MAPPING_CONFLICT(a.getName(), mapping));
}
}
return servletName;
}
/**
* Enhance existing servlet configuration.
*
* @return Servlet name or null if no servlet added
*/
private String addServletWithExistingRegistration(final ServletContext sc, ServletRegistration sr,
final Class a, final Set> classes)
throws ServletException {
String servletName = null;
if (sr.getClassName() == null) {
// create a new servlet container for a given app.
final ResourceConfig resourceConfig = ResourceConfig.forApplicationClass(a, classes)
.addProperties(getInitParams(sr))
.addProperties(WebComponent.getContextParams(sc));
final ServletContainer s = new ServletContainer(resourceConfig);
servletName = a.getName();
final ServletRegistration.Dynamic dsr = sc.addServlet(servletName, s);
dsr.setAsyncSupported(true);
dsr.setLoadOnStartup(1);
if (dsr.getMappings().isEmpty()) {
final ApplicationPath ap = a.getAnnotation(ApplicationPath.class);
if (ap != null) {
final String mapping = createMappingPath(ap);
if (!mappingExists(sc, mapping)) {
dsr.addMapping(mapping);
LOGGER.log(Level.INFO,
LocalizationMessages.JERSEY_APP_REGISTERED_MAPPING(a.getName(), mapping));
} else {
LOGGER.log(Level.SEVERE, LocalizationMessages.JERSEY_APP_MAPPING_CONFLICT(a.getName(), mapping));
}
} else {
// Error
LOGGER.log(Level.SEVERE, LocalizationMessages.JERSEY_APP_NO_MAPPING_OR_ANNOTATION(
a.getName(), ApplicationPath.class.getSimpleName()));
}
} else {
LOGGER.log(Level.INFO, LocalizationMessages.JERSEY_APP_REGISTERED_APPLICATION(a.getName()));
}
}
return servletName;
}
/**
* Add {@code value} to the {@code list} if the value is NOT {@code null}.
*/
private static void addNotNull(Set list, String value) {
if (value != null) {
list.add(value);
}
}
private static Map getInitParams(ServletRegistration sr) {
final Map initParams = Maps.newHashMap();
for (Map.Entry entry : sr.getInitParameters().entrySet()) {
initParams.put(entry.getKey(), entry.getValue());
}
return initParams;
}
private boolean mappingExists(ServletContext sc, String mapping) {
for (ServletRegistration sr : sc.getServletRegistrations().values()) {
for (String declaredMapping : sr.getMappings()) {
if (mapping.equals(declaredMapping)) {
return true;
}
}
}
return false;
}
private String createMappingPath(ApplicationPath ap) {
String path = ap.value();
if (!path.startsWith("/")) {
path = "/" + path;
}
if (!path.endsWith("/*")) {
if (path.endsWith("/")) {
path += "*";
} else {
path += "/*";
}
}
return path;
}
private Set> getApplicationClasses(Set> classes) {
Set> s = new LinkedHashSet>();
for (Class c : classes) {
if (Application.class != c && Application.class.isAssignableFrom(c)) {
s.add(c.asSubclass(Application.class));
}
}
return s;
}
private Set> getRootResourceAndProviderClasses(Set> classes) {
// TODO filter out any classes from the Jersey jars
Set> s = new LinkedHashSet>();
for (Class c : classes) {
if (c.isAnnotationPresent(Path.class) || c.isAnnotationPresent(Provider.class)) {
s.add(c);
}
}
return s;
}
}
