org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder Maven / Gradle / Ivy
/*
* Copyright 2002-2020 the original author or authors.
*
* 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
*
* https://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.
*/
package org.springframework.web.servlet.mvc.method.annotation;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import org.aopalliance.intercept.MethodInterceptor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.target.EmptyTargetSource;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.cglib.core.SpringNamingPolicy;
import org.springframework.cglib.proxy.Callback;
import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.Factory;
import org.springframework.cglib.proxy.MethodProxy;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.MethodIntrospector;
import org.springframework.core.MethodParameter;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.SynthesizingMethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.objenesis.ObjenesisException;
import org.springframework.objenesis.SpringObjenesis;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.PathMatcher;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.ReflectionUtils.MethodFilter;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.method.annotation.RequestParamMethodArgumentResolver;
import org.springframework.web.method.support.CompositeUriComponentsContributor;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
import org.springframework.web.util.UriComponentsBuilder;
/**
* Creates instances of {@link org.springframework.web.util.UriComponentsBuilder}
* by pointing to {@code @RequestMapping} methods on Spring MVC controllers.
*
* There are several groups of methods:
*
* - Static {@code fromXxx(...)} methods to prepare links using information
* from the current request as determined by a call to
* {@link org.springframework.web.servlet.support.ServletUriComponentsBuilder#fromCurrentServletMapping()}.
*
- Static {@code fromXxx(UriComponentsBuilder,...)} methods can be given
* a baseUrl when operating outside the context of a request.
*
- Instance-based {@code withXxx(...)} methods where an instance of
* MvcUriComponentsBuilder is created with a baseUrl via
* {@link #relativeTo(org.springframework.web.util.UriComponentsBuilder)}.
*
*
* Note: This class uses values from "Forwarded"
* (RFC 7239),
* "X-Forwarded-Host", "X-Forwarded-Port", and "X-Forwarded-Proto" headers,
* if present, in order to reflect the client-originated protocol and address.
* Consider using the {@code ForwardedHeaderFilter} in order to choose from a
* central place whether to extract and use, or to discard such headers.
* See the Spring Framework reference for more on this filter.
*
* @author Oliver Gierke
* @author Rossen Stoyanchev
* @author Sam Brannen
* @since 4.0
*/
public class MvcUriComponentsBuilder {
/** Well-known name for the {@link CompositeUriComponentsContributor} object in the bean factory. */
public static final String MVC_URI_COMPONENTS_CONTRIBUTOR_BEAN_NAME = "mvcUriComponentsContributor";
private static final Log logger = LogFactory.getLog(MvcUriComponentsBuilder.class);
private static final SpringObjenesis objenesis = new SpringObjenesis();
private static final PathMatcher pathMatcher = new AntPathMatcher();
private static final ParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer();
private static final CompositeUriComponentsContributor defaultUriComponentsContributor;
static {
defaultUriComponentsContributor = new CompositeUriComponentsContributor(
new PathVariableMethodArgumentResolver(), new RequestParamMethodArgumentResolver(false));
}
private final UriComponentsBuilder baseUrl;
/**
* Default constructor. Protected to prevent direct instantiation.
* @see #fromController(Class)
* @see #fromMethodName(Class, String, Object...)
* @see #fromMethodCall(Object)
* @see #fromMappingName(String)
* @see #fromMethod(Class, Method, Object...)
*/
protected MvcUriComponentsBuilder(UriComponentsBuilder baseUrl) {
Assert.notNull(baseUrl, "'baseUrl' is required");
this.baseUrl = baseUrl;
}
/**
* Create an instance of this class with a base URL. After that calls to one
* of the instance based {@code withXxx(...}} methods will create URLs relative
* to the given base URL.
*/
public static MvcUriComponentsBuilder relativeTo(UriComponentsBuilder baseUrl) {
return new MvcUriComponentsBuilder(baseUrl);
}
/**
* Create a {@link UriComponentsBuilder} from the mapping of a controller class
* and current request information including Servlet mapping. If the controller
* contains multiple mappings, only the first one is used.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param controllerType the controller to build a URI for
* @return a UriComponentsBuilder instance (never {@code null})
*/
public static UriComponentsBuilder fromController(Class controllerType) {
return fromController(null, controllerType);
}
/**
* An alternative to {@link #fromController(Class)} that accepts a
* {@code UriComponentsBuilder} representing the base URL. This is useful
* when using MvcUriComponentsBuilder outside the context of processing a
* request or to apply a custom baseUrl not matching the current request.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param builder the builder for the base URL; the builder will be cloned
* and therefore not modified and may be re-used for further calls.
* @param controllerType the controller to build a URI for
* @return a UriComponentsBuilder instance (never {@code null})
*/
public static UriComponentsBuilder fromController(@Nullable UriComponentsBuilder builder,
Class controllerType) {
builder = getBaseUrlToUse(builder);
// Externally configured prefix via PathConfigurer..
String prefix = getPathPrefix(controllerType);
builder.path(prefix);
String mapping = getClassMapping(controllerType);
builder.path(mapping);
return builder;
}
/**
* Create a {@link UriComponentsBuilder} from the mapping of a controller
* method and an array of method argument values. This method delegates
* to {@link #fromMethod(Class, Method, Object...)}.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param controllerType the controller
* @param methodName the method name
* @param args the argument values
* @return a UriComponentsBuilder instance, never {@code null}
* @throws IllegalArgumentException if there is no matching or
* if there is more than one matching method
*/
public static UriComponentsBuilder fromMethodName(Class controllerType,
String methodName, Object... args) {
Method method = getMethod(controllerType, methodName, args);
return fromMethodInternal(null, controllerType, method, args);
}
/**
* An alternative to {@link #fromMethodName(Class, String, Object...)} that
* accepts a {@code UriComponentsBuilder} representing the base URL. This is
* useful when using MvcUriComponentsBuilder outside the context of processing
* a request or to apply a custom baseUrl not matching the current request.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param builder the builder for the base URL; the builder will be cloned
* and therefore not modified and may be re-used for further calls.
* @param controllerType the controller
* @param methodName the method name
* @param args the argument values
* @return a UriComponentsBuilder instance, never {@code null}
* @throws IllegalArgumentException if there is no matching or
* if there is more than one matching method
*/
public static UriComponentsBuilder fromMethodName(UriComponentsBuilder builder,
Class controllerType, String methodName, Object... args) {
Method method = getMethod(controllerType, methodName, args);
return fromMethodInternal(builder, controllerType, method, args);
}
/**
* Create a {@link UriComponentsBuilder} from the mapping of a controller method
* and an array of method argument values. The array of values must match the
* signature of the controller method. Values for {@code @RequestParam} and
* {@code @PathVariable} are used for building the URI (via implementations of
* {@link org.springframework.web.method.support.UriComponentsContributor
* UriComponentsContributor}) while remaining argument values are ignored and
* can be {@code null}.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param controllerType the controller type
* @param method the controller method
* @param args argument values for the controller method
* @return a UriComponentsBuilder instance, never {@code null}
* @since 4.2
*/
public static UriComponentsBuilder fromMethod(Class controllerType, Method method, Object... args) {
return fromMethodInternal(null, controllerType, method, args);
}
/**
* An alternative to {@link #fromMethod(Class, Method, Object...)}
* that accepts a {@code UriComponentsBuilder} representing the base URL.
* This is useful when using MvcUriComponentsBuilder outside the context of
* processing a request or to apply a custom baseUrl not matching the
* current request.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param baseUrl the builder for the base URL; the builder will be cloned
* and therefore not modified and may be re-used for further calls.
* @param controllerType the controller type
* @param method the controller method
* @param args argument values for the controller method
* @return a UriComponentsBuilder instance (never {@code null})
* @since 4.2
*/
public static UriComponentsBuilder fromMethod(UriComponentsBuilder baseUrl,
@Nullable Class controllerType, Method method, Object... args) {
return fromMethodInternal(baseUrl,
(controllerType != null ? controllerType : method.getDeclaringClass()), method, args);
}
/**
* Create a {@link UriComponentsBuilder} by invoking a "mock" controller method.
* The controller method and the supplied argument values are then used to
* delegate to {@link #fromMethod(Class, Method, Object...)}.
*
For example, given this controller:
*
* @RequestMapping("/people/{id}/addresses")
* class AddressController {
*
* @RequestMapping("/{country}")
* public HttpEntity<Void> getAddressesForCountry(@PathVariable String country) { ... }
*
* @RequestMapping(value="/", method=RequestMethod.POST)
* public void addAddress(Address address) { ... }
* }
*
* A UriComponentsBuilder can be created:
*
* // Inline style with static import of "MvcUriComponentsBuilder.on"
*
* MvcUriComponentsBuilder.fromMethodCall(
* on(AddressController.class).getAddressesForCountry("US")).buildAndExpand(1);
*
* // Longer form useful for repeated invocation (and void controller methods)
*
* AddressController controller = MvcUriComponentsBuilder.on(AddressController.class);
* controller.addAddress(null);
* builder = MvcUriComponentsBuilder.fromMethodCall(controller);
* controller.getAddressesForCountry("US")
* builder = MvcUriComponentsBuilder.fromMethodCall(controller);
*
* Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param info either the value returned from a "mock" controller
* invocation or the "mock" controller itself after an invocation
* @return a UriComponents instance
* @see #on(Class)
* @see #controller(Class)
*/
public static UriComponentsBuilder fromMethodCall(Object info) {
Assert.isInstanceOf(MethodInvocationInfo.class, info, "MethodInvocationInfo required");
MethodInvocationInfo invocationInfo = (MethodInvocationInfo) info;
Class controllerType = invocationInfo.getControllerType();
Method method = invocationInfo.getControllerMethod();
Object[] arguments = invocationInfo.getArgumentValues();
return fromMethodInternal(null, controllerType, method, arguments);
}
/**
* An alternative to {@link #fromMethodCall(Object)} that accepts a
* {@code UriComponentsBuilder} representing the base URL. This is useful
* when using MvcUriComponentsBuilder outside the context of processing a
* request or to apply a custom baseUrl not matching the current request.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param builder the builder for the base URL; the builder will be cloned
* and therefore not modified and may be re-used for further calls.
* @param info either the value returned from a "mock" controller
* invocation or the "mock" controller itself after an invocation
* @return a UriComponents instance
*/
public static UriComponentsBuilder fromMethodCall(UriComponentsBuilder builder, Object info) {
Assert.isInstanceOf(MethodInvocationInfo.class, info, "MethodInvocationInfo required");
MethodInvocationInfo invocationInfo = (MethodInvocationInfo) info;
Class controllerType = invocationInfo.getControllerType();
Method method = invocationInfo.getControllerMethod();
Object[] arguments = invocationInfo.getArgumentValues();
return fromMethodInternal(builder, controllerType, method, arguments);
}
/**
* Return a "mock" controller instance. When an {@code @RequestMapping} method
* on the controller is invoked, the supplied argument values are remembered
* and the result can then be used to create a {@code UriComponentsBuilder}
* via {@link #fromMethodCall(Object)}.
*
Note that this is a shorthand version of {@link #controller(Class)} intended
* for inline use (with a static import), for example:
*
* MvcUriComponentsBuilder.fromMethodCall(on(FooController.class).getFoo(1)).build();
*
* Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
*
* @param controllerType the target controller
*/
public static T on(Class controllerType) {
return controller(controllerType);
}
/**
* Return a "mock" controller instance. When an {@code @RequestMapping} method
* on the controller is invoked, the supplied argument values are remembered
* and the result can then be used to create {@code UriComponentsBuilder} via
* {@link #fromMethodCall(Object)}.
* This is a longer version of {@link #on(Class)}. It is needed with controller
* methods returning void as well for repeated invocations.
*
* FooController fooController = controller(FooController.class);
*
* fooController.saveFoo(1, null);
* builder = MvcUriComponentsBuilder.fromMethodCall(fooController);
*
* fooController.saveFoo(2, null);
* builder = MvcUriComponentsBuilder.fromMethodCall(fooController);
*
* Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param controllerType the target controller
*/
public static T controller(Class controllerType) {
Assert.notNull(controllerType, "'controllerType' must not be null");
return ControllerMethodInvocationInterceptor.initProxy(controllerType, null);
}
/**
* Create a URL from the name of a Spring MVC controller method's request mapping.
* The configured
* {@link org.springframework.web.servlet.handler.HandlerMethodMappingNamingStrategy
* HandlerMethodMappingNamingStrategy} determines the names of controller
* method request mappings at startup. By default all mappings are assigned
* a name based on the capital letters of the class name, followed by "#" as
* separator, and then the method name. For example "PC#getPerson"
* for a class named PersonController with method getPerson. In case the
* naming convention does not produce unique results, an explicit name may
* be assigned through the name attribute of the {@code @RequestMapping}
* annotation.
*
This is aimed primarily for use in view rendering technologies and EL
* expressions. The Spring URL tag library registers this method as a function
* called "mvcUrl".
*
For example, given this controller:
*
* @RequestMapping("/people")
* class PersonController {
*
* @RequestMapping("/{id}")
* public HttpEntity<Void> getPerson(@PathVariable String id) { ... }
*
* }
*
*
* A JSP can prepare a URL to the controller method as follows:
*
*
* <%@ taglib uri="http://www.springframework.org/tags" prefix="s" %>
*
* <a href="${s:mvcUrl('PC#getPerson').arg(0,"123").build()}">Get Person</a>
*
* Note that it's not necessary to specify all arguments. Only the ones
* required to prepare the URL, mainly {@code @RequestParam} and {@code @PathVariable}).
*
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
*
* @param mappingName the mapping name
* @return a builder to prepare the URI String
* @throws IllegalArgumentException if the mapping name is not found or
* if there is no unique match
* @since 4.1
*/
public static MethodArgumentBuilder fromMappingName(String mappingName) {
return fromMappingName(null, mappingName);
}
/**
* An alternative to {@link #fromMappingName(String)} that accepts a
* {@code UriComponentsBuilder} representing the base URL. This is useful
* when using MvcUriComponentsBuilder outside the context of processing a
* request or to apply a custom baseUrl not matching the current request.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @param builder the builder for the base URL; the builder will be cloned
* and therefore not modified and may be re-used for further calls.
* @param name the mapping name
* @return a builder to prepare the URI String
* @throws IllegalArgumentException if the mapping name is not found or
* if there is no unique match
* @since 4.2
*/
public static MethodArgumentBuilder fromMappingName(@Nullable UriComponentsBuilder builder, String name) {
WebApplicationContext wac = getWebApplicationContext();
Assert.notNull(wac, "No WebApplicationContext. ");
Map map = wac.getBeansOfType(RequestMappingInfoHandlerMapping.class);
List handlerMethods = null;
for (RequestMappingInfoHandlerMapping mapping : map.values()) {
handlerMethods = mapping.getHandlerMethodsForMappingName(name);
if (handlerMethods != null) {
break;
}
}
if (handlerMethods == null) {
throw new IllegalArgumentException("Mapping not found: " + name);
}
else if (handlerMethods.size() != 1) {
throw new IllegalArgumentException("No unique match for mapping " + name + ": " + handlerMethods);
}
else {
HandlerMethod handlerMethod = handlerMethods.get(0);
Class controllerType = handlerMethod.getBeanType();
Method method = handlerMethod.getMethod();
return new MethodArgumentBuilder(builder, controllerType, method);
}
}
// Instance methods, relative to a base UriComponentsBuilder...
/**
* An alternative to {@link #fromController(Class)} for use with an instance
* of this class created via a call to {@link #relativeTo}.
* Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @since 4.2
*/
public UriComponentsBuilder withController(Class controllerType) {
return fromController(this.baseUrl, controllerType);
}
/**
* An alternative to {@link #fromMethodName(Class, String, Object...)}} for
* use with an instance of this class created via {@link #relativeTo}.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @since 4.2
*/
public UriComponentsBuilder withMethodName(Class controllerType, String methodName, Object... args) {
return fromMethodName(this.baseUrl, controllerType, methodName, args);
}
/**
* An alternative to {@link #fromMethodCall(Object)} for use with an instance
* of this class created via {@link #relativeTo}.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @since 4.2
*/
public UriComponentsBuilder withMethodCall(Object invocationInfo) {
return fromMethodCall(this.baseUrl, invocationInfo);
}
/**
* An alternative to {@link #fromMappingName(String)} for use with an instance
* of this class created via {@link #relativeTo}.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @since 4.2
*/
public MethodArgumentBuilder withMappingName(String mappingName) {
return fromMappingName(this.baseUrl, mappingName);
}
/**
* An alternative to {@link #fromMethod(Class, Method, Object...)}
* for use with an instance of this class created via {@link #relativeTo}.
*
Note: This method extracts values from "Forwarded"
* and "X-Forwarded-*" headers if found. See class-level docs.
* @since 4.2
*/
public UriComponentsBuilder withMethod(Class controllerType, Method method, Object... args) {
return fromMethod(this.baseUrl, controllerType, method, args);
}
private static UriComponentsBuilder fromMethodInternal(@Nullable UriComponentsBuilder builder,
Class controllerType, Method method, Object... args) {
builder = getBaseUrlToUse(builder);
// Externally configured prefix via PathConfigurer..
String prefix = getPathPrefix(controllerType);
builder.path(prefix);
String typePath = getClassMapping(controllerType);
String methodPath = getMethodMapping(method);
String path = pathMatcher.combine(typePath, methodPath);
if (StringUtils.hasLength(path) && !path.startsWith("/")) {
path = "/" + path;
}
builder.path(path);
return applyContributors(builder, method, args);
}
private static UriComponentsBuilder getBaseUrlToUse(@Nullable UriComponentsBuilder baseUrl) {
return baseUrl == null ?
ServletUriComponentsBuilder.fromCurrentServletMapping() :
baseUrl.cloneBuilder();
}
private static String getPathPrefix(Class controllerType) {
WebApplicationContext wac = getWebApplicationContext();
if (wac != null) {
Map map = wac.getBeansOfType(RequestMappingHandlerMapping.class);
for (RequestMappingHandlerMapping mapping : map.values()) {
if (mapping.isHandler(controllerType)) {
String prefix = mapping.getPathPrefix(controllerType);
if (prefix != null) {
return prefix;
}
}
}
}
return "";
}
private static String getClassMapping(Class controllerType) {
Assert.notNull(controllerType, "'controllerType' must not be null");
RequestMapping mapping = AnnotatedElementUtils.findMergedAnnotation(controllerType, RequestMapping.class);
if (mapping == null) {
return "/";
}
String[] paths = mapping.path();
if (ObjectUtils.isEmpty(paths) || !StringUtils.hasLength(paths[0])) {
return "/";
}
if (paths.length > 1 && logger.isTraceEnabled()) {
logger.trace("Using first of multiple paths on " + controllerType.getName());
}
return paths[0];
}
private static String getMethodMapping(Method method) {
Assert.notNull(method, "'method' must not be null");
RequestMapping requestMapping = AnnotatedElementUtils.findMergedAnnotation(method, RequestMapping.class);
if (requestMapping == null) {
throw new IllegalArgumentException("No @RequestMapping on: " + method.toGenericString());
}
String[] paths = requestMapping.path();
if (ObjectUtils.isEmpty(paths) || !StringUtils.hasLength(paths[0])) {
return "/";
}
if (paths.length > 1 && logger.isTraceEnabled()) {
logger.trace("Using first of multiple paths on " + method.toGenericString());
}
return paths[0];
}
private static Method getMethod(Class controllerType, final String methodName, final Object... args) {
MethodFilter selector = method -> {
String name = method.getName();
int argLength = method.getParameterCount();
return (name.equals(methodName) && argLength == args.length);
};
Set methods = MethodIntrospector.selectMethods(controllerType, selector);
if (methods.size() == 1) {
return methods.iterator().next();
}
else if (methods.size() > 1) {
throw new IllegalArgumentException(String.format(
"Found two methods named '%s' accepting arguments %s in controller %s: [%s]",
methodName, Arrays.asList(args), controllerType.getName(), methods));
}
else {
throw new IllegalArgumentException("No method named '" + methodName + "' with " + args.length +
" arguments found in controller " + controllerType.getName());
}
}
private static UriComponentsBuilder applyContributors(UriComponentsBuilder builder, Method method, Object... args) {
CompositeUriComponentsContributor contributor = getUriComponentsContributor();
int paramCount = method.getParameterCount();
int argCount = args.length;
if (paramCount != argCount) {
throw new IllegalArgumentException("Number of method parameters " + paramCount +
" does not match number of argument values " + argCount);
}
final Map uriVars = new HashMap<>();
for (int i = 0; i < paramCount; i++) {
MethodParameter param = new SynthesizingMethodParameter(method, i);
param.initParameterNameDiscovery(parameterNameDiscoverer);
contributor.contributeMethodArgument(param, args[i], builder, uriVars);
}
// This may not be all the URI variables, supply what we have so far..
return builder.uriVariables(uriVars);
}
private static CompositeUriComponentsContributor getUriComponentsContributor() {
WebApplicationContext wac = getWebApplicationContext();
if (wac != null) {
try {
return wac.getBean(MVC_URI_COMPONENTS_CONTRIBUTOR_BEAN_NAME, CompositeUriComponentsContributor.class);
}
catch (NoSuchBeanDefinitionException ex) {
// Ignore
}
}
return defaultUriComponentsContributor;
}
@Nullable
private static WebApplicationContext getWebApplicationContext() {
RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
if (requestAttributes == null) {
return null;
}
HttpServletRequest request = ((ServletRequestAttributes) requestAttributes).getRequest();
String attributeName = DispatcherServlet.WEB_APPLICATION_CONTEXT_ATTRIBUTE;
WebApplicationContext wac = (WebApplicationContext) request.getAttribute(attributeName);
if (wac == null) {
return null;
}
return wac;
}
/**
* Method invocation information.
*/
public interface MethodInvocationInfo {
/**
* Return the controller types.
*/
Class getControllerType();
/**
* Return the controller method.
*/
Method getControllerMethod();
/**
* Return the argument values.
*/
Object[] getArgumentValues();
}
private static class ControllerMethodInvocationInterceptor
implements org.springframework.cglib.proxy.MethodInterceptor, MethodInterceptor, MethodInvocationInfo {
private final Class controllerType;
@Nullable
private Method controllerMethod;
@Nullable
private Object[] argumentValues;
ControllerMethodInvocationInterceptor(Class controllerType) {
this.controllerType = controllerType;
}
@Override
@Nullable
public Object intercept(Object obj, Method method, Object[] args, @Nullable MethodProxy proxy) {
switch (method.getName()) {
case "getControllerType": return this.controllerType;
case "getControllerMethod": return this.controllerMethod;
case "getArgumentValues": return this.argumentValues;
}
if (ReflectionUtils.isObjectMethod(method)) {
return ReflectionUtils.invokeMethod(method, obj, args);
}
else {
this.controllerMethod = method;
this.argumentValues = args;
Class returnType = method.getReturnType();
try {
return (returnType == void.class ? null : returnType.cast(initProxy(returnType, this)));
}
catch (Throwable ex) {
throw new IllegalStateException(
"Failed to create proxy for controller method return type: " + method, ex);
}
}
}
@Override
@Nullable
public Object invoke(org.aopalliance.intercept.MethodInvocation inv) throws Throwable {
return intercept(inv.getThis(), inv.getMethod(), inv.getArguments(), null);
}
@Override
public Class getControllerType() {
return this.controllerType;
}
@Override
public Method getControllerMethod() {
Assert.state(this.controllerMethod != null, "Not initialized yet");
return this.controllerMethod;
}
@Override
public Object[] getArgumentValues() {
Assert.state(this.argumentValues != null, "Not initialized yet");
return this.argumentValues;
}
@SuppressWarnings("unchecked")
private static T initProxy(
Class controllerType, @Nullable ControllerMethodInvocationInterceptor interceptor) {
interceptor = interceptor != null ?
interceptor : new ControllerMethodInvocationInterceptor(controllerType);
if (controllerType == Object.class) {
return (T) interceptor;
}
else if (controllerType.isInterface()) {
ProxyFactory factory = new ProxyFactory(EmptyTargetSource.INSTANCE);
factory.addInterface(controllerType);
factory.addInterface(MethodInvocationInfo.class);
factory.addAdvice(interceptor);
return (T) factory.getProxy();
}
else {
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(controllerType);
enhancer.setInterfaces(new Class[] {MethodInvocationInfo.class});
enhancer.setNamingPolicy(SpringNamingPolicy.INSTANCE);
enhancer.setCallbackType(org.springframework.cglib.proxy.MethodInterceptor.class);
Class proxyClass = enhancer.createClass();
Object proxy = null;
if (objenesis.isWorthTrying()) {
try {
proxy = objenesis.newInstance(proxyClass, enhancer.getUseCache());
}
catch (ObjenesisException ex) {
logger.debug("Failed to create controller proxy, falling back on default constructor", ex);
}
}
if (proxy == null) {
try {
proxy = ReflectionUtils.accessibleConstructor(proxyClass).newInstance();
}
catch (Throwable ex) {
throw new IllegalStateException(
"Failed to create controller proxy or use default constructor", ex);
}
}
((Factory) proxy).setCallbacks(new Callback[] {interceptor});
return (T) proxy;
}
}
}
/**
* Builder class to create URLs for method arguments.
*/
public static class MethodArgumentBuilder {
private final Class controllerType;
private final Method method;
private final Object[] argumentValues;
private final UriComponentsBuilder baseUrl;
/**
* Create a new {@link MethodArgumentBuilder} instance.
* @since 4.2
*/
public MethodArgumentBuilder(Class controllerType, Method method) {
this(null, controllerType, method);
}
/**
* Create a new {@link MethodArgumentBuilder} instance.
* @since 4.2
*/
public MethodArgumentBuilder(@Nullable UriComponentsBuilder baseUrl, Class controllerType, Method method) {
Assert.notNull(controllerType, "'controllerType' is required");
Assert.notNull(method, "'method' is required");
this.baseUrl = baseUrl != null ? baseUrl : UriComponentsBuilder.fromPath(getPath());
this.controllerType = controllerType;
this.method = method;
this.argumentValues = new Object[method.getParameterCount()];
}
private static String getPath() {
UriComponentsBuilder builder = ServletUriComponentsBuilder.fromCurrentServletMapping();
String path = builder.build().getPath();
return path != null ? path : "";
}
public MethodArgumentBuilder arg(int index, Object value) {
this.argumentValues[index] = value;
return this;
}
/**
* Use this method only if you need to apply strong encoding to expanded
* URI variables by quoting all characters with reserved meaning.
* @since 5.0.8
*/
public MethodArgumentBuilder encode() {
this.baseUrl.encode();
return this;
}
public String build() {
return fromMethodInternal(this.baseUrl, this.controllerType, this.method, this.argumentValues)
.build().encode().toUriString();
}
public String buildAndExpand(Object... uriVars) {
return fromMethodInternal(this.baseUrl, this.controllerType, this.method, this.argumentValues)
.buildAndExpand(uriVars).encode().toString();
}
}
}