Java tutorial
/* * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * WSO2 Inc. 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.ballerinalang.composer.service.workspace.tryit; import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import org.apache.commons.io.IOUtils; import org.apache.commons.lang3.StringUtils; import org.apache.http.Header; import org.apache.http.HttpHeaders; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpEntityEnclosingRequestBase; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.protocol.HttpCoreContext; import java.io.IOException; import java.net.URI; import java.nio.charset.Charset; import java.util.Locale; /** * Try it client for http protocol. */ public class HttpTryItClient extends TryItClient { private Gson gson; private boolean calculateTime = true; /** * Initializes the client. * @param serviceUrl The service url. Example: hostname:port. * @param clientArgs client args */ public HttpTryItClient(String serviceUrl, String clientArgs) { super(serviceUrl, clientArgs); gson = new Gson(); } /** * {@inheritDoc} */ @Override public String execute() throws TryItException { try { HttpClient client = HttpClientBuilder.create().build(); HttpCoreContext localContext = new HttpCoreContext(); // Create url for the request. String requestUrl = this.buildUrl(); String httpMethod = this.clientArgs.get(TryItConstants.HTTP_METHOD).getAsString(); switch (httpMethod.toLowerCase(Locale.getDefault())) { case "get": case "delete": case "options": case "head": case "trace": HttpRequestBase httpRequest = new TryItHttpRequestBase(httpMethod.toUpperCase(Locale.getDefault())); // Setting the url for the request. httpRequest.setURI(URI.create(requestUrl)); // Setting the request headers. JsonArray getHeaders = this.clientArgs.getAsJsonArray(TryItConstants.REQUEST_HEADERS); for (JsonElement getHeader : getHeaders) { JsonObject header = getHeader.getAsJsonObject(); if (StringUtils.isNotBlank(header.get("key").getAsString()) && StringUtils.isNotBlank(header.get("value").getAsString())) { httpRequest.setHeader(header.get("key").getAsString(), header.get("value").getAsString()); } } // Setting the content type. if (StringUtils.isBlank(this.clientArgs.get(TryItConstants.CONTENT_TYPE).getAsString())) { httpRequest.setHeader(HttpHeaders.CONTENT_TYPE, ContentType.TEXT_PLAIN.getMimeType()); } else { httpRequest.setHeader(HttpHeaders.CONTENT_TYPE, this.clientArgs.get(TryItConstants.CONTENT_TYPE).getAsString()); } // To track how long the request took. long start = System.currentTimeMillis(); // Executing the request. HttpResponse response = client.execute(httpRequest, localContext); long elapsed = System.currentTimeMillis() - start; return jsonStringifyResponse(response, localContext.getRequest().getAllHeaders(), requestUrl, elapsed); default: HttpEntityEnclosingRequestBase httpEntityRequest = new TryItHttpEntityEnclosingRequestBase( httpMethod.toUpperCase(Locale.getDefault())); // Setting the url for the request. httpEntityRequest.setURI(URI.create(requestUrl)); // Setting the request headers. JsonArray getEntityHeaders = this.clientArgs.getAsJsonArray(TryItConstants.REQUEST_HEADERS); for (JsonElement getHeader : getEntityHeaders) { JsonObject header = getHeader.getAsJsonObject(); if (StringUtils.isNotBlank(header.get("key").getAsString()) && StringUtils.isNotBlank(header.get("value").getAsString())) { httpEntityRequest.setHeader(header.get("key").getAsString(), header.get("value").getAsString()); } } // Setting the body of the request. StringEntity postEntity = new StringEntity( this.clientArgs.get(TryItConstants.REQUEST_BODY).getAsString()); httpEntityRequest.setEntity(postEntity); // Setting the content type. if (StringUtils.isBlank(this.clientArgs.get(TryItConstants.CONTENT_TYPE).getAsString())) { httpEntityRequest.setHeader(HttpHeaders.CONTENT_TYPE, ContentType.TEXT_PLAIN.getMimeType()); } else { httpEntityRequest.setHeader(HttpHeaders.CONTENT_TYPE, this.clientArgs.get(TryItConstants.CONTENT_TYPE).getAsString()); } // To track how long the request took. long entityRequestStart = System.currentTimeMillis(); // Executing the request. HttpResponse entityResponse = client.execute(httpEntityRequest, localContext); long entityRequestDuration = System.currentTimeMillis() - entityRequestStart; return jsonStringifyResponse(entityResponse, localContext.getRequest().getAllHeaders(), requestUrl, entityRequestDuration); } } catch (java.io.IOException e) { throw new TryItException(e.getMessage()); } } /** * Converts a response to json string. * @param response The http response. * @return The response as a json string. * @throws IOException Error while getting the body of the response. */ private String jsonStringifyResponse(HttpResponse response, Header[] headers, String requestUrl, long timeConsumed) throws IOException { JsonObject responseContent = new JsonObject(); // Setting the response code. responseContent.addProperty(TryItConstants.RESPONSE_CODE, Integer.toString(response.getStatusLine().getStatusCode())); // Setting the body of the response. String responseBody = ""; if (null != response.getEntity()) { responseBody = IOUtils.toString(response.getEntity().getContent(), Charset.defaultCharset()); IOUtils.closeQuietly(response.getEntity().getContent()); } responseContent.addProperty(TryItConstants.RESPONSE_BODY, responseBody); // Setting the headers of the response. if (response.getAllHeaders().length > 0) { JsonObject responseHeaders = new JsonObject(); for (Header header : response.getAllHeaders()) { responseHeaders.addProperty(header.getName(), header.getValue()); } responseContent.add(TryItConstants.RESPONSE_HEADERS, responseHeaders); } // Setting the headers of the request. JsonObject requestHeadersMap = new JsonObject(); for (Header requestHeader : headers) { requestHeadersMap.addProperty(requestHeader.getName(), requestHeader.getValue()); } requestHeadersMap.addProperty(HttpHeaders.USER_AGENT, "Ballerina Composer"); responseContent.add(TryItConstants.RETURNED_REQUEST_HEADERS, requestHeadersMap); // Setting the time consumed. if (this.calculateTime) { responseContent.addProperty(TryItConstants.TIME_CONSUMED, Long.toString(timeConsumed)); } // Setting the request url. responseContent.addProperty(TryItConstants.REQUEST_URL, requestUrl); // Json stringifying. return gson.toJson(responseContent); } /** * Builds the url for the service. * @return The urls of the service. */ private String buildUrl() { if (this.clientArgs.get(TryItConstants.APPEND_URL).getAsString().length() > 0 && this.clientArgs.get(TryItConstants.APPEND_URL).getAsString().charAt(0) == '/') { return "http://" + this.serviceUrl + this.clientArgs.get(TryItConstants.APPEND_URL).getAsString(); } else { return "http://" + this.serviceUrl + "/" + this.clientArgs.get(TryItConstants.APPEND_URL).getAsString(); } } /** * Disables sending the duration of the http request in the response. */ public void disableTimeDurationCalculation() { this.calculateTime = false; } /** * Static class for http requests without entity. */ private static class TryItHttpRequestBase extends HttpRequestBase { private final String httpMethod; TryItHttpRequestBase(String httpMethod) { this.httpMethod = httpMethod; } @Override public String getMethod() { return httpMethod; } } /** * Static class for http requests with entity. */ private static class TryItHttpEntityEnclosingRequestBase extends HttpEntityEnclosingRequestBase { private final String httpMethod; TryItHttpEntityEnclosingRequestBase(String httpMethod) { this.httpMethod = httpMethod; } @Override public String getMethod() { return httpMethod; } } }