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/**
* Copyright 2016-2017 ZTE Corporation.
*
* 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
*
* 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.onap.workflow.activitiext.restservicetask;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.BpmnError;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.delegate.JavaDelegate;
import org.activiti.engine.impl.context.Context;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
/**
* rest service
*
* @author 10222158
*
*/
public class HttpUtil implements JavaDelegate {
private static final Logger logger = LoggerFactory.getLogger(HttpUtil.class);
private Expression uri;
private Expression method;
private Expression accept;
private Expression contentType;
private Expression parameters;
@Override
public void execute(DelegateExecution execution) throws ActivitiException {
try {
this.executeMethod(execution);
} catch (Exception e) {
logger.error("Invoke rest service failed!", e);
throw new BpmnError(e.getMessage());
}
}
/**
* invoke rest service
*
* @param execution
*/
public boolean executeMethod(DelegateExecution execution) throws Exception {
String uriValue = getValue(uri, execution);
String methodValue = getValue(method, execution);
String acceptValue = getValue(accept, execution);
String contentTypeValue = getValue(contentType, execution);
String parametersValue = getValue(parameters, execution);
Map<String, String> requestBody = new HashMap<String, String>();
if (!StringUtils.isEmpty(parametersValue)) {
// Parse the parameter into Object List
List<Parameter> parameters = JSONArray.parseArray(parametersValue, Parameter.class);
for (Parameter param : parameters) {
handleParam(execution, param, requestBody, uriValue);
}
}
String requestPayload = JSON.toJSONString(requestBody);
// invoke http service
HttpResponseMessage msg = HighLevelRestApi.invoke(methodValue, uriValue, requestPayload, acceptValue,
contentTypeValue);
// inject the result to variable
execution.setVariable(execution.getCurrentActivityId(), msg);
logger.info("statusCode: " + msg.getStatusCode());
logger.info("responseBody: " + msg.getResponseBody());
return true;
}
/**
*
* @param execution
* @param param
* @param requestBody
* @param uriValue
*/
public void handleParam(DelegateExecution execution, Parameter param, Map<String, String> requestBody,
String uriValue) throws ActivitiException {
if (ConstString.PARAMETER_TYPE_EXPRESSION.equals(param.getType())) {
handleExpression(execution, param);
}
switch (param.getPosition()) {
case ConstString.PARAMETER_POSITION_PATH:
// replace the path parameter
uriValue = uriValue.replaceAll("\\{+" + param.getName() + "+\\}", param.getValue());
break;
case ConstString.PARAMETER_POSITION_QUERY:
// add the query parameter
if (!uriValue.contains("?")) {
uriValue = uriValue + "?" + param.getName() + "=" + param.getValue();
} else {
uriValue = uriValue + "&" + param.getName() + "=" + param.getValue();
}
break;
case ConstString.PARAMETER_POSITION_BODY:
// add parameter to request body
requestBody.put(param.getName(), param.getValue());
break;
default:
throw new ActivitiException(
"The position '" + param.getPosition() + "' is illegal, please check your input!");
}
}
/**
* get value from VariableScope
*
* @param expression
* @param execution
* @return
*/
public String getValue(Expression expression, DelegateExecution execution) {
String value = new String();
if (expression != null) {
value = (String) expression.getValue(execution);
}
return value;
}
/**
* parse expression in the parameter
*
* @param execution
* @param param
*/
public void handleExpression(DelegateExecution execution, Parameter param) {
Expression expression = Context.getProcessEngineConfiguration().getExpressionManager()
.createExpression(param.getValue());
String value = String.valueOf(expression.getValue(execution));
param.setValue(value);
}
}
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