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The Core Camel Java DSL based router
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.camel.model.rest;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElementRef;
import javax.xml.bind.annotation.XmlRootElement;
import org.apache.camel.CamelContext;
import org.apache.camel.model.OptionalIdentifiedDefinition;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.model.RouteDefinition;
import org.apache.camel.model.ToDefinition;
import org.apache.camel.model.ToDynamicDefinition;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.RestConfiguration;
import org.apache.camel.util.FileUtil;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.URISupport;
/**
* Defines a rest service using the rest-dsl
*/
@Metadata(label = "rest")
@XmlRootElement(name = "rest")
@XmlAccessorType(XmlAccessType.FIELD)
public class RestDefinition extends OptionalIdentifiedDefinition {
@XmlAttribute
private String path;
@XmlAttribute
private String tag;
@XmlAttribute
private String consumes;
@XmlAttribute
private String produces;
@XmlAttribute @Metadata(defaultValue = "auto")
private RestBindingMode bindingMode;
@XmlAttribute
private Boolean skipBindingOnErrorCode;
@XmlAttribute
private Boolean enableCORS;
@XmlAttribute
private Boolean apiDocs;
@XmlElementRef
private List verbs = new ArrayList();
@Override
public String getLabel() {
return "rest";
}
public String getPath() {
return path;
}
/**
* Path of the rest service, such as "/foo"
*/
public void setPath(String path) {
this.path = path;
}
public String getTag() {
return tag;
}
/**
* To configure a special tag for the operations within this rest definition.
*/
public void setTag(String tag) {
this.tag = tag;
}
public String getConsumes() {
return consumes;
}
/**
* To define the content type what the REST service consumes (accept as input), such as application/xml or application/json.
* This option will override what may be configured on a parent level
*/
public void setConsumes(String consumes) {
this.consumes = consumes;
}
public String getProduces() {
return produces;
}
/**
* To define the content type what the REST service produces (uses for output), such as application/xml or application/json
* This option will override what may be configured on a parent level
*/
public void setProduces(String produces) {
this.produces = produces;
}
public RestBindingMode getBindingMode() {
return bindingMode;
}
/**
* Sets the binding mode to use.
* This option will override what may be configured on a parent level
*
* The default value is auto
*/
public void setBindingMode(RestBindingMode bindingMode) {
this.bindingMode = bindingMode;
}
public List getVerbs() {
return verbs;
}
/**
* The HTTP verbs this REST service accepts and uses
*/
public void setVerbs(List verbs) {
this.verbs = verbs;
}
public Boolean getSkipBindingOnErrorCode() {
return skipBindingOnErrorCode;
}
/**
* Whether to skip binding on output if there is a custom HTTP error code header.
* This allows to build custom error messages that do not bind to json / xml etc, as success messages otherwise will do.
* This option will override what may be configured on a parent level
*/
public void setSkipBindingOnErrorCode(Boolean skipBindingOnErrorCode) {
this.skipBindingOnErrorCode = skipBindingOnErrorCode;
}
public Boolean getEnableCORS() {
return enableCORS;
}
/**
* Whether to enable CORS headers in the HTTP response.
* This option will override what may be configured on a parent level
*
* The default value is false.
*/
public void setEnableCORS(Boolean enableCORS) {
this.enableCORS = enableCORS;
}
public Boolean getApiDocs() {
return apiDocs;
}
/**
* Whether to include or exclude the VerbDefinition in API documentation.
* This option will override what may be configured on a parent level
*
* The default value is true.
*/
public void setApiDocs(Boolean apiDocs) {
this.apiDocs = apiDocs;
}
// Fluent API
//-------------------------------------------------------------------------
/**
* To set the base path of this REST service
*/
public RestDefinition path(String path) {
setPath(path);
return this;
}
/**
* To set the tag to use of this REST service
*/
public RestDefinition tag(String tag) {
setTag(tag);
return this;
}
public RestDefinition get() {
return addVerb("get", null);
}
public RestDefinition get(String uri) {
return addVerb("get", uri);
}
public RestDefinition post() {
return addVerb("post", null);
}
public RestDefinition post(String uri) {
return addVerb("post", uri);
}
public RestDefinition put() {
return addVerb("put", null);
}
public RestDefinition put(String uri) {
return addVerb("put", uri);
}
public RestDefinition delete() {
return addVerb("delete", null);
}
public RestDefinition delete(String uri) {
return addVerb("delete", uri);
}
public RestDefinition head() {
return addVerb("head", null);
}
public RestDefinition head(String uri) {
return addVerb("head", uri);
}
public RestDefinition options() {
return addVerb("options", null);
}
public RestDefinition options(String uri) {
return addVerb("options", uri);
}
public RestDefinition verb(String verb) {
return addVerb(verb, null);
}
public RestDefinition verb(String verb, String uri) {
return addVerb(verb, uri);
}
@Override
public RestDefinition id(String id) {
if (getVerbs().isEmpty()) {
super.id(id);
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.id(id);
}
return this;
}
@Override
public RestDefinition description(String text) {
if (getVerbs().isEmpty()) {
super.description(text);
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.description(text);
}
return this;
}
@Override
public RestDefinition description(String id, String text, String lang) {
if (getVerbs().isEmpty()) {
super.description(id, text, lang);
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.description(id, text, lang);
}
return this;
}
public RestDefinition consumes(String mediaType) {
if (getVerbs().isEmpty()) {
this.consumes = mediaType;
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setConsumes(mediaType);
}
return this;
}
public RestOperationParamDefinition param() {
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
return param(verb);
}
public RestDefinition param(RestOperationParamDefinition param) {
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.getParams().add(param);
return this;
}
public RestDefinition params(List params) {
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.getParams().addAll(params);
return this;
}
public RestOperationParamDefinition param(VerbDefinition verb) {
return new RestOperationParamDefinition(verb);
}
public RestDefinition responseMessage(RestOperationResponseMsgDefinition msg) {
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.getResponseMsgs().add(msg);
return this;
}
public RestOperationResponseMsgDefinition responseMessage() {
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
return responseMessage(verb);
}
public RestOperationResponseMsgDefinition responseMessage(VerbDefinition verb) {
return new RestOperationResponseMsgDefinition(verb);
}
public RestDefinition responseMessages(List msgs) {
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.getResponseMsgs().addAll(msgs);
return this;
}
public RestDefinition produces(String mediaType) {
if (getVerbs().isEmpty()) {
this.produces = mediaType;
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setProduces(mediaType);
}
return this;
}
public RestDefinition type(Class classType) {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setType(classType.getCanonicalName());
return this;
}
public RestDefinition typeList(Class classType) {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
// list should end with [] to indicate array
verb.setType(classType.getCanonicalName() + "[]");
return this;
}
public RestDefinition outType(Class classType) {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setOutType(classType.getCanonicalName());
return this;
}
public RestDefinition outTypeList(Class classType) {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
// list should end with [] to indicate array
verb.setOutType(classType.getCanonicalName() + "[]");
return this;
}
public RestDefinition bindingMode(RestBindingMode mode) {
if (getVerbs().isEmpty()) {
this.bindingMode = mode;
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setBindingMode(mode);
}
return this;
}
public RestDefinition skipBindingOnErrorCode(boolean skipBindingOnErrorCode) {
if (getVerbs().isEmpty()) {
this.skipBindingOnErrorCode = skipBindingOnErrorCode;
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setSkipBindingOnErrorCode(skipBindingOnErrorCode);
}
return this;
}
public RestDefinition enableCORS(boolean enableCORS) {
if (getVerbs().isEmpty()) {
this.enableCORS = enableCORS;
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setEnableCORS(enableCORS);
}
return this;
}
/**
* Include or exclude the current Rest Definition in API documentation.
*
* The default value is true.
*/
public RestDefinition apiDocs(Boolean apiDocs) {
if (getVerbs().isEmpty()) {
this.apiDocs = apiDocs;
} else {
// add on last verb as that is how the Java DSL works
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setApiDocs(apiDocs);
}
return this;
}
/**
* Routes directly to the given static endpoint.
*
* If you need additional routing capabilities, then use {@link #route()} instead.
*
* @param uri the uri of the endpoint
* @return this builder
*/
public RestDefinition to(String uri) {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
ToDefinition to = new ToDefinition(uri);
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setTo(to);
return this;
}
/**
* Routes directly to the given dynamic endpoint.
*
* If you need additional routing capabilities, then use {@link #route()} instead.
*
* @param uri the uri of the endpoint
* @return this builder
*/
public RestDefinition toD(String uri) {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
ToDynamicDefinition to = new ToDynamicDefinition(uri);
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setToD(to);
return this;
}
public RouteDefinition route() {
// add to last verb
if (getVerbs().isEmpty()) {
throw new IllegalArgumentException("Must add verb first, such as get/post/delete");
}
// link them together so we can navigate using Java DSL
RouteDefinition route = new RouteDefinition();
route.setRestDefinition(this);
VerbDefinition verb = getVerbs().get(getVerbs().size() - 1);
verb.setRoute(route);
return route;
}
// Implementation
//-------------------------------------------------------------------------
private RestDefinition addVerb(String verb, String uri) {
VerbDefinition answer;
if ("get".equals(verb)) {
answer = new GetVerbDefinition();
} else if ("post".equals(verb)) {
answer = new PostVerbDefinition();
} else if ("delete".equals(verb)) {
answer = new DeleteVerbDefinition();
} else if ("head".equals(verb)) {
answer = new HeadVerbDefinition();
} else if ("put".equals(verb)) {
answer = new PutVerbDefinition();
} else if ("options".equals(verb)) {
answer = new OptionsVerbDefinition();
} else {
answer = new VerbDefinition();
answer.setMethod(verb);
}
getVerbs().add(answer);
answer.setRest(this);
answer.setUri(uri);
return this;
}
/**
* Transforms this REST definition into a list of {@link org.apache.camel.model.RouteDefinition} which
* Camel routing engine can add and run. This allows us to define REST services using this
* REST DSL and turn those into regular Camel routes.
*/
public List asRouteDefinition(CamelContext camelContext) {
List answer = new ArrayList();
if (camelContext.getRestConfigurations().isEmpty()) {
camelContext.getRestConfiguration();
}
for (RestConfiguration config : camelContext.getRestConfigurations()) {
addRouteDefinition(camelContext, answer, config.getComponent());
}
return answer;
}
/**
* Transforms the rest api configuration into a {@link org.apache.camel.model.RouteDefinition} which
* Camel routing engine uses to service the rest api docs.
*/
public static RouteDefinition asRouteApiDefinition(CamelContext camelContext, RestConfiguration configuration) {
RouteDefinition answer = new RouteDefinition();
// create the from endpoint uri which is using the rest-api component
String from = "rest-api:" + configuration.getApiContextPath();
// append options
Map options = new HashMap();
String routeId = configuration.getApiContextRouteId();
if (routeId == null) {
routeId = answer.idOrCreate(camelContext.getNodeIdFactory());
}
options.put("routeId", routeId);
if (configuration.getComponent() != null && !configuration.getComponent().isEmpty()) {
options.put("componentName", configuration.getComponent());
}
if (configuration.getApiContextIdPattern() != null) {
options.put("contextIdPattern", configuration.getApiContextIdPattern());
}
if (!options.isEmpty()) {
String query;
try {
query = URISupport.createQueryString(options);
} catch (URISyntaxException e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
}
from = from + "?" + query;
}
// we use the same uri as the producer (so we have a little route for the rest api)
String to = from;
answer.fromRest(from);
answer.id(routeId);
answer.to(to);
return answer;
}
private void addRouteDefinition(CamelContext camelContext, List answer, String component) {
for (VerbDefinition verb : getVerbs()) {
// either the verb has a singular to or a embedded route
RouteDefinition route = verb.getRoute();
if (route == null) {
// it was a singular to, so add a new route and add the singular
// to as output to this route
route = new RouteDefinition();
ProcessorDefinition def = verb.getTo() != null ? verb.getTo() : verb.getToD();
route.getOutputs().add(def);
}
// add the binding
RestBindingDefinition binding = new RestBindingDefinition();
binding.setComponent(component);
binding.setType(verb.getType());
binding.setOutType(verb.getOutType());
// verb takes precedence over configuration on rest
if (verb.getConsumes() != null) {
binding.setConsumes(verb.getConsumes());
} else {
binding.setConsumes(getConsumes());
}
if (verb.getProduces() != null) {
binding.setProduces(verb.getProduces());
} else {
binding.setProduces(getProduces());
}
if (verb.getBindingMode() != null) {
binding.setBindingMode(verb.getBindingMode());
} else {
binding.setBindingMode(getBindingMode());
}
if (verb.getSkipBindingOnErrorCode() != null) {
binding.setSkipBindingOnErrorCode(verb.getSkipBindingOnErrorCode());
} else {
binding.setSkipBindingOnErrorCode(getSkipBindingOnErrorCode());
}
if (verb.getEnableCORS() != null) {
binding.setEnableCORS(verb.getEnableCORS());
} else {
binding.setEnableCORS(getEnableCORS());
}
route.getOutputs().add(0, binding);
// create the from endpoint uri which is using the rest component
String from = "rest:" + verb.asVerb() + ":" + buildUri(verb);
// append options
Map options = new HashMap();
// verb takes precedence over configuration on rest
if (verb.getConsumes() != null) {
options.put("consumes", verb.getConsumes());
} else if (getConsumes() != null) {
options.put("consumes", getConsumes());
}
if (verb.getProduces() != null) {
options.put("produces", verb.getProduces());
} else if (getProduces() != null) {
options.put("produces", getProduces());
}
// append optional type binding information
String inType = binding.getType();
if (inType != null) {
options.put("inType", inType);
}
String outType = binding.getOutType();
if (outType != null) {
options.put("outType", outType);
}
// if no route id has been set, then use the verb id as route id
if (!route.hasCustomIdAssigned()) {
// use id of verb as route id
String id = verb.getId();
if (id != null) {
route.setId(id);
}
}
String routeId = route.idOrCreate(camelContext.getNodeIdFactory());
verb.setRouteId(routeId);
options.put("routeId", routeId);
if (component != null && !component.isEmpty()) {
options.put("componentName", component);
}
// include optional description, which we favor from 1) to/route description 2) verb description 3) rest description
// this allows end users to define general descriptions and override then per to/route or verb
String description = verb.getTo() != null ? verb.getTo().getDescriptionText() : route.getDescriptionText();
if (description == null) {
description = verb.getDescriptionText();
}
if (description == null) {
description = getDescriptionText();
}
if (description != null) {
options.put("description", description);
}
if (!options.isEmpty()) {
String query;
try {
query = URISupport.createQueryString(options);
} catch (URISyntaxException e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
}
from = from + "?" + query;
}
String path = getPath();
String s1 = FileUtil.stripTrailingSeparator(path);
String s2 = FileUtil.stripLeadingSeparator(verb.getUri());
String allPath;
if (s1 != null && s2 != null) {
allPath = s1 + "/" + s2;
} else if (path != null) {
allPath = path;
} else {
allPath = verb.getUri();
}
// each {} is a parameter (url templating)
String[] arr = allPath.split("\\/");
for (String a : arr) {
// need to resolve property placeholders first
try {
a = camelContext.resolvePropertyPlaceholders(a);
} catch (Exception e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
}
if (a.startsWith("{") && a.endsWith("}")) {
String key = a.substring(1, a.length() - 1);
// merge if exists
boolean found = false;
for (RestOperationParamDefinition param : verb.getParams()) {
// name is mandatory
String name = param.getName();
ObjectHelper.notEmpty(name, "parameter name");
// need to resolve property placeholders first
try {
name = camelContext.resolvePropertyPlaceholders(name);
} catch (Exception e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
}
if (name.equalsIgnoreCase(key)) {
param.type(RestParamType.path);
found = true;
break;
}
}
if (!found) {
param(verb).name(key).type(RestParamType.path).endParam();
}
}
}
if (verb.getType() != null) {
String bodyType = verb.getType();
if (bodyType.endsWith("[]")) {
bodyType = "List[" + bodyType.substring(0, bodyType.length() - 2) + "]";
}
RestOperationParamDefinition param = findParam(verb, RestParamType.body.name());
if (param == null) {
// must be body type and set the model class as data type
param(verb).name(RestParamType.body.name()).type(RestParamType.body).dataType(bodyType).endParam();
} else {
// must be body type and set the model class as data type
param.type(RestParamType.body).dataType(bodyType);
}
}
// the route should be from this rest endpoint
route.fromRest(from);
route.id(routeId);
route.setRestDefinition(this);
answer.add(route);
}
}
private String buildUri(VerbDefinition verb) {
if (path != null && verb.getUri() != null) {
return path + ":" + verb.getUri();
} else if (path != null) {
return path;
} else if (verb.getUri() != null) {
return verb.getUri();
} else {
return "";
}
}
private RestOperationParamDefinition findParam(VerbDefinition verb, String name) {
for (RestOperationParamDefinition param : verb.getParams()) {
if (name.equals(param.getName())) {
return param;
}
}
return null;
}
}