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package org.glassfish.jersey.servlet.init;
import java.util.Collections;
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 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)
*/
@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<Class<?>> classes, ServletContext sc) throws ServletException {
if (classes == null) {
classes = Collections.emptySet();
}
// first see if there are any application classes in the web app
for (Class<? extends Application> a : getApplicationClasses(classes)) {
final ServletRegistration appReg = sc.getServletRegistration(a.getName());
if (appReg != null) {
addServletWithExistingRegistration(sc, appReg, a, 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<Registration> srs = getInitParamDeclaredRegistrations(sc, a);
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) {
addServletWithExistingRegistration(sc, (ServletRegistration) sr, a, classes);
}
}
} else {
// app not handled by any servlet/filter -> add it
addServletWithApplication(sc, a, classes);
}
}
}
// check for javax.ws.rs.core.Application registration
addServletWithDefaultConfiguration(sc, classes);
}
private List<Registration> getInitParamDeclaredRegistrations(ServletContext sc, Class<? extends Application> a) {
final List<Registration> srs = Lists.newArrayList();
collectJaxRsRegistrations(sc.getServletRegistrations(), srs, a);
collectJaxRsRegistrations(sc.getFilterRegistrations(), srs, a);
return srs;
}
private void collectJaxRsRegistrations(Map<String, ? extends Registration> registrations,
List<Registration> collected, Class<? extends Application> a) {
for (Registration sr : registrations.values()) {
Map<String, String> ips = sr.getInitParameters();
if (ips.containsKey(ServletProperties.JAXRS_APPLICATION_CLASS)) {
if (ips.get(ServletProperties.JAXRS_APPLICATION_CLASS).equals(a.getName())) {
collected.add(sr);
}
}
}
}
private void addServletWithDefaultConfiguration(ServletContext sc, Set<Class<?>> classes) throws ServletException {
ServletRegistration appReg = sc.getServletRegistration(Application.class.getName());
if (appReg != null && appReg.getClassName() == null) {
final Set<Class<?>> appClasses = getRootResourceAndProviderClasses(classes);
final ServletContainer s = new ServletContainer(
ResourceConfig.forApplicationClass(ResourceConfig.class, appClasses).addProperties(getInitParams(appReg))
.addProperties(WebComponent.getContextParams(sc))
);
appReg = sc.addServlet(appReg.getName(), s);
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));
}
}
}
private void addServletWithApplication(final ServletContext sc,
final Class<? extends Application> a, final Set<Class<?>> classes) throws ServletException {
final ApplicationPath ap = a.getAnnotation(ApplicationPath.class);
if (ap != null) {
// App is annotated with ApplicationPath
final ResourceConfig rc = ResourceConfig.forApplicationClass(a, classes);
final ServletContainer s = new ServletContainer(rc);
final ServletRegistration.Dynamic dsr = sc.addServlet(a.getName(), s);
dsr.setAsyncSupported(true);
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));
}
}
}
private void addServletWithExistingRegistration(final ServletContext sc, ServletRegistration sr,
final Class<? extends Application> a, final Set<Class<?>> classes) throws ServletException {
if (sr.getClassName() == null) {
// create a new servlet container for a given app.
final ResourceConfig rc = ResourceConfig.forApplicationClass(a, classes).addProperties(getInitParams(sr))
.addProperties(WebComponent.getContextParams(sc));
final ServletContainer s = new ServletContainer(rc);
ServletRegistration.Dynamic dsr = sc.addServlet(a.getName(), s);
dsr.setAsyncSupported(true);
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()));
}
}
}
private static Map<String, Object> getInitParams(ServletRegistration sr) {
final Map<String, Object> initParams = Maps.newHashMap();
for (Map.Entry<String, String> 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<Class<? extends Application>> getApplicationClasses(Set<Class<?>> classes) {
Set<Class<? extends Application>> s = new LinkedHashSet<Class<? extends Application>>();
for (Class<?> c : classes) {
if (Application.class != c && Application.class.isAssignableFrom(c)) {
s.add(c.asSubclass(Application.class));
}
}
return s;
}
private Set<Class<?>> getRootResourceAndProviderClasses(Set<Class<?>> classes) {
// TODO filter out any classes from the Jersey jars
Set<Class<?>> s = new LinkedHashSet<Class<?>>();
for (Class<?> c : classes) {
if (c.isAnnotationPresent(Path.class) || c.isAnnotationPresent(Provider.class)) {
s.add(c);
}
}
return s;
}
}