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/*
* Copyright 2002-2022 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.http;
import java.lang.reflect.Type;
import java.net.URI;
import java.nio.charset.Charset;
import java.time.Instant;
import java.time.ZonedDateTime;
import java.util.Arrays;
import java.util.Map;
import java.util.function.Consumer;
import org.springframework.lang.Nullable;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ObjectUtils;
import org.springframework.web.util.UriTemplateHandler;
/**
* Extension of {@link HttpEntity} that also exposes the HTTP method and the
* target URL. For use in the {@code RestTemplate} to prepare requests with
* and in {@code @Controller} methods to represent request input.
*
* Example use with the {@code RestTemplate}:
*
* MyRequest body = ...
* RequestEntity<MyRequest> request = RequestEntity
* .post("https://example.com/{foo}", "bar")
* .accept(MediaType.APPLICATION_JSON)
* .body(body);
* ResponseEntity<MyResponse> response = template.exchange(request, MyResponse.class);
*
*
* Example use in an {@code @Controller}:
*
* @RequestMapping("/handle")
* public void handle(RequestEntity<String> request) {
* HttpMethod method = request.getMethod();
* URI url = request.getUrl();
* String body = request.getBody();
* }
*
*
* @author Arjen Poutsma
* @author Sebastien Deleuze
* @author Parviz Rozikov
* @since 4.1
* @param the body type
* @see #getMethod()
* @see #getUrl()
* @see org.springframework.web.client.RestOperations#exchange(RequestEntity, Class)
* @see ResponseEntity
*/
public class RequestEntity extends HttpEntity {
@Nullable
private final HttpMethod method;
@Nullable
private final URI url;
@Nullable
private final Type type;
/**
* Constructor with method and URL but without body nor headers.
* @param method the method
* @param url the URL
*/
public RequestEntity(HttpMethod method, URI url) {
this(null, null, method, url, null);
}
/**
* Constructor with method, URL and body but without headers.
* @param body the body
* @param method the method
* @param url the URL
*/
public RequestEntity(@Nullable T body, HttpMethod method, URI url) {
this(body, null, method, url, null);
}
/**
* Constructor with method, URL, body and type but without headers.
* @param body the body
* @param method the method
* @param url the URL
* @param type the type used for generic type resolution
* @since 4.3
*/
public RequestEntity(@Nullable T body, HttpMethod method, URI url, Type type) {
this(body, null, method, url, type);
}
/**
* Constructor with method, URL and headers but without body.
* @param headers the headers
* @param method the method
* @param url the URL
*/
public RequestEntity(MultiValueMap headers, HttpMethod method, URI url) {
this(null, headers, method, url, null);
}
/**
* Constructor with method, URL, headers and body.
* @param body the body
* @param headers the headers
* @param method the method
* @param url the URL
*/
public RequestEntity(@Nullable T body, @Nullable MultiValueMap headers,
@Nullable HttpMethod method, URI url) {
this(body, headers, method, url, null);
}
/**
* Constructor with method, URL, headers, body and type.
* @param body the body
* @param headers the headers
* @param method the method
* @param url the URL
* @param type the type used for generic type resolution
* @since 4.3
*/
public RequestEntity(@Nullable T body, @Nullable MultiValueMap headers,
@Nullable HttpMethod method, @Nullable URI url, @Nullable Type type) {
super(body, headers);
this.method = method;
this.url = url;
this.type = type;
}
/**
* Return the HTTP method of the request.
* @return the HTTP method as an {@code HttpMethod} enum value
*/
@Nullable
public HttpMethod getMethod() {
return this.method;
}
/**
* Return the {@link URI} for the target HTTP endpoint.
* Note: This method raises
* {@link UnsupportedOperationException} if the {@code RequestEntity} was
* created with a URI template and variables rather than with a {@link URI}
* instance. This is because a URI cannot be created without further input
* on how to expand template and encode the URI. In such cases, the
* {@code URI} is prepared by the
* {@link org.springframework.web.client.RestTemplate} with the help of the
* {@link UriTemplateHandler} it is configured with.
*/
public URI getUrl() {
if (this.url == null) {
throw new UnsupportedOperationException(
"The RequestEntity was created with a URI template and variables, " +
"and there is not enough information on how to correctly expand and " +
"encode the URI template. This will be done by the RestTemplate instead " +
"with help from the UriTemplateHandler it is configured with.");
}
return this.url;
}
/**
* Return the type of the request's body.
* @return the request's body type, or {@code null} if not known
* @since 4.3
*/
@Nullable
public Type getType() {
if (this.type == null) {
T body = getBody();
if (body != null) {
return body.getClass();
}
}
return this.type;
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!super.equals(other)) {
return false;
}
RequestEntity otherEntity = (RequestEntity) other;
return (ObjectUtils.nullSafeEquals(this.method, otherEntity.method) &&
ObjectUtils.nullSafeEquals(this.url, otherEntity.url));
}
@Override
public int hashCode() {
int hashCode = super.hashCode();
hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.method);
hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.url);
return hashCode;
}
@Override
public String toString() {
return format(getMethod(), getUrl().toString(), getBody(), getHeaders());
}
static String format(@Nullable HttpMethod httpMethod, String url, @Nullable T body, HttpHeaders headers) {
StringBuilder builder = new StringBuilder("<");
builder.append(httpMethod);
builder.append(' ');
builder.append(url);
builder.append(',');
if (body != null) {
builder.append(body);
builder.append(',');
}
builder.append(headers);
builder.append('>');
return builder.toString();
}
// Static builder methods
/**
* Create a builder with the given method and url.
* @param method the HTTP method (GET, POST, etc)
* @param url the URL
* @return the created builder
*/
public static BodyBuilder method(HttpMethod method, URI url) {
return new DefaultBodyBuilder(method, url);
}
/**
* Create a builder with the given HTTP method, URI template, and variables.
* @param method the HTTP method (GET, POST, etc)
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static BodyBuilder method(HttpMethod method, String uriTemplate, Object... uriVariables) {
return new DefaultBodyBuilder(method, uriTemplate, uriVariables);
}
/**
* Create a builder with the given HTTP method, URI template, and variables.
* @param method the HTTP method (GET, POST, etc)
* @param uriTemplate the uri template to use
* @return the created builder
* @since 5.3
*/
public static BodyBuilder method(HttpMethod method, String uriTemplate, Map uriVariables) {
return new DefaultBodyBuilder(method, uriTemplate, uriVariables);
}
/**
* Create an HTTP GET builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder get(URI url) {
return method(HttpMethod.GET, url);
}
/**
* Create an HTTP GET builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static HeadersBuilder get(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.GET, uriTemplate, uriVariables);
}
/**
* Create an HTTP HEAD builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder head(URI url) {
return method(HttpMethod.HEAD, url);
}
/**
* Create an HTTP HEAD builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static HeadersBuilder head(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.HEAD, uriTemplate, uriVariables);
}
/**
* Create an HTTP POST builder with the given url.
* @param url the URL
* @return the created builder
*/
public static BodyBuilder post(URI url) {
return method(HttpMethod.POST, url);
}
/**
* Create an HTTP POST builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static BodyBuilder post(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.POST, uriTemplate, uriVariables);
}
/**
* Create an HTTP PUT builder with the given url.
* @param url the URL
* @return the created builder
*/
public static BodyBuilder put(URI url) {
return method(HttpMethod.PUT, url);
}
/**
* Create an HTTP PUT builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static BodyBuilder put(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.PUT, uriTemplate, uriVariables);
}
/**
* Create an HTTP PATCH builder with the given url.
* @param url the URL
* @return the created builder
*/
public static BodyBuilder patch(URI url) {
return method(HttpMethod.PATCH, url);
}
/**
* Create an HTTP PATCH builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static BodyBuilder patch(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.PATCH, uriTemplate, uriVariables);
}
/**
* Create an HTTP DELETE builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder delete(URI url) {
return method(HttpMethod.DELETE, url);
}
/**
* Create an HTTP DELETE builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static HeadersBuilder delete(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.DELETE, uriTemplate, uriVariables);
}
/**
* Creates an HTTP OPTIONS builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder options(URI url) {
return method(HttpMethod.OPTIONS, url);
}
/**
* Creates an HTTP OPTIONS builder with the given string base uri template.
* @param uriTemplate the uri template to use
* @param uriVariables variables to expand the URI template with
* @return the created builder
* @since 5.3
*/
public static HeadersBuilder options(String uriTemplate, Object... uriVariables) {
return method(HttpMethod.OPTIONS, uriTemplate, uriVariables);
}
/**
* Defines a builder that adds headers to the request entity.
* @param the builder subclass
*/
public interface HeadersBuilder> {
/**
* Add the given, single header value under the given name.
* @param headerName the header name
* @param headerValues the header value(s)
* @return this builder
* @see HttpHeaders#add(String, String)
*/
B header(String headerName, String... headerValues);
/**
* Copy the given headers into the entity's headers map.
* @param headers the existing HttpHeaders to copy from
* @return this builder
* @since 5.2
* @see HttpHeaders#add(String, String)
*/
B headers(@Nullable HttpHeaders headers);
/**
* Manipulate this entity's headers with the given consumer. The
* headers provided to the consumer are "live", so that the consumer can be used to
* {@linkplain HttpHeaders#set(String, String) overwrite} existing header values,
* {@linkplain HttpHeaders#remove(Object) remove} values, or use any of the other
* {@link HttpHeaders} methods.
* @param headersConsumer a function that consumes the {@code HttpHeaders}
* @return this builder
* @since 5.2
*/
B headers(Consumer headersConsumer);
/**
* Set the list of acceptable {@linkplain MediaType media types}, as
* specified by the {@code Accept} header.
* @param acceptableMediaTypes the acceptable media types
*/
B accept(MediaType... acceptableMediaTypes);
/**
* Set the list of acceptable {@linkplain Charset charsets}, as specified
* by the {@code Accept-Charset} header.
* @param acceptableCharsets the acceptable charsets
*/
B acceptCharset(Charset... acceptableCharsets);
/**
* Set the value of the {@code If-Modified-Since} header.
* @param ifModifiedSince the new value of the header
* @since 5.1.4
*/
B ifModifiedSince(ZonedDateTime ifModifiedSince);
/**
* Set the value of the {@code If-Modified-Since} header.
* @param ifModifiedSince the new value of the header
* @since 5.1.4
*/
B ifModifiedSince(Instant ifModifiedSince);
/**
* Set the value of the {@code If-Modified-Since} header.
* The date should be specified as the number of milliseconds since
* January 1, 1970 GMT.
* @param ifModifiedSince the new value of the header
*/
B ifModifiedSince(long ifModifiedSince);
/**
* Set the values of the {@code If-None-Match} header.
* @param ifNoneMatches the new value of the header
*/
B ifNoneMatch(String... ifNoneMatches);
/**
* Builds the request entity with no body.
* @return the request entity
* @see BodyBuilder#body(Object)
*/
RequestEntity build();
}
/**
* Defines a builder that adds a body to the response entity.
*/
public interface BodyBuilder extends HeadersBuilder {
/**
* Set the length of the body in bytes, as specified by the
* {@code Content-Length} header.
* @param contentLength the content length
* @return this builder
* @see HttpHeaders#setContentLength(long)
*/
BodyBuilder contentLength(long contentLength);
/**
* Set the {@linkplain MediaType media type} of the body, as specified
* by the {@code Content-Type} header.
* @param contentType the content type
* @return this builder
* @see HttpHeaders#setContentType(MediaType)
*/
BodyBuilder contentType(MediaType contentType);
/**
* Set the body of the request entity and build the RequestEntity.
* @param the type of the body
* @param body the body of the request entity
* @return the built request entity
*/
RequestEntity body(T body);
/**
* Set the body and type of the request entity and build the RequestEntity.
* @param the type of the body
* @param body the body of the request entity
* @param type the type of the body, useful for generic type resolution
* @return the built request entity
* @since 4.3
*/
RequestEntity body(T body, Type type);
}
private static class DefaultBodyBuilder implements BodyBuilder {
private final HttpMethod method;
private final HttpHeaders headers = new HttpHeaders();
@Nullable
private final URI uri;
@Nullable
private final String uriTemplate;
@Nullable
private final Object[] uriVarsArray;
@Nullable
private final Map uriVarsMap;
DefaultBodyBuilder(HttpMethod method, URI url) {
this.method = method;
this.uri = url;
this.uriTemplate = null;
this.uriVarsArray = null;
this.uriVarsMap = null;
}
DefaultBodyBuilder(HttpMethod method, String uriTemplate, Object... uriVars) {
this.method = method;
this.uri = null;
this.uriTemplate = uriTemplate;
this.uriVarsArray = uriVars;
this.uriVarsMap = null;
}
DefaultBodyBuilder(HttpMethod method, String uriTemplate, Map uriVars) {
this.method = method;
this.uri = null;
this.uriTemplate = uriTemplate;
this.uriVarsArray = null;
this.uriVarsMap = uriVars;
}
@Override
public BodyBuilder header(String headerName, String... headerValues) {
for (String headerValue : headerValues) {
this.headers.add(headerName, headerValue);
}
return this;
}
@Override
public BodyBuilder headers(@Nullable HttpHeaders headers) {
if (headers != null) {
this.headers.putAll(headers);
}
return this;
}
@Override
public BodyBuilder headers(Consumer headersConsumer) {
headersConsumer.accept(this.headers);
return this;
}
@Override
public BodyBuilder accept(MediaType... acceptableMediaTypes) {
this.headers.setAccept(Arrays.asList(acceptableMediaTypes));
return this;
}
@Override
public BodyBuilder acceptCharset(Charset... acceptableCharsets) {
this.headers.setAcceptCharset(Arrays.asList(acceptableCharsets));
return this;
}
@Override
public BodyBuilder contentLength(long contentLength) {
this.headers.setContentLength(contentLength);
return this;
}
@Override
public BodyBuilder contentType(MediaType contentType) {
this.headers.setContentType(contentType);
return this;
}
@Override
public BodyBuilder ifModifiedSince(ZonedDateTime ifModifiedSince) {
this.headers.setIfModifiedSince(ifModifiedSince);
return this;
}
@Override
public BodyBuilder ifModifiedSince(Instant ifModifiedSince) {
this.headers.setIfModifiedSince(ifModifiedSince);
return this;
}
@Override
public BodyBuilder ifModifiedSince(long ifModifiedSince) {
this.headers.setIfModifiedSince(ifModifiedSince);
return this;
}
@Override
public BodyBuilder ifNoneMatch(String... ifNoneMatches) {
this.headers.setIfNoneMatch(Arrays.asList(ifNoneMatches));
return this;
}
@Override
public RequestEntity build() {
return buildInternal(null, null);
}
@Override
public RequestEntity body(T body) {
return buildInternal(body, null);
}
@Override
public RequestEntity body(T body, Type type) {
return buildInternal(body, type);
}
private RequestEntity buildInternal(@Nullable T body, @Nullable Type type) {
if (this.uri != null) {
return new RequestEntity<>(body, this.headers, this.method, this.uri, type);
}
else if (this.uriTemplate != null){
return new UriTemplateRequestEntity<>(body, this.headers, this.method, type,
this.uriTemplate, this.uriVarsArray, this.uriVarsMap);
}
else {
throw new IllegalStateException("Neither URI nor URI template");
}
}
}
/**
* RequestEntity initialized with a URI template and variables instead of a {@link URI}.
* @since 5.3
* @param the body type
*/
public static class UriTemplateRequestEntity extends RequestEntity {
private final String uriTemplate;
@Nullable
private final Object[] uriVarsArray;
@Nullable
private final Map uriVarsMap;
UriTemplateRequestEntity(
@Nullable T body, @Nullable MultiValueMap headers,
@Nullable HttpMethod method, @Nullable Type type, String uriTemplate,
@Nullable Object[] uriVarsArray, @Nullable Map uriVarsMap) {
super(body, headers, method, null, type);
this.uriTemplate = uriTemplate;
this.uriVarsArray = uriVarsArray;
this.uriVarsMap = uriVarsMap;
}
public String getUriTemplate() {
return this.uriTemplate;
}
@Nullable
public Object[] getVars() {
return this.uriVarsArray;
}
@Nullable
public Map getVarsMap() {
return this.uriVarsMap;
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!super.equals(other)) {
return false;
}
UriTemplateRequestEntity otherEntity = (UriTemplateRequestEntity) other;
return (ObjectUtils.nullSafeEquals(this.uriTemplate, otherEntity.uriTemplate) &&
ObjectUtils.nullSafeEquals(this.uriVarsArray, otherEntity.uriVarsArray) &&
ObjectUtils.nullSafeEquals(this.uriVarsMap, otherEntity.uriVarsMap));
}
@Override
public int hashCode() {
return (29 * super.hashCode() + ObjectUtils.nullSafeHashCode(this.uriTemplate));
}
@Override
public String toString() {
return format(getMethod(), getUriTemplate(), getBody(), getHeaders());
}
}
}