org.apache.ambari.view.slider.rest.client.BaseHttpClient.java Source code

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Here is the source code for org.apache.ambari.view.slider.rest.client.BaseHttpClient.java

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/**
 * 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.ambari.view.slider.rest.client;

import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;

import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonReader;

public class BaseHttpClient {

    private HttpClient httpClient;
    private String url;
    private boolean needsAuthentication;
    private String userId;
    private String password;

    public BaseHttpClient(String url) {
        setUrl(url);
        setNeedsAuthentication(false);
    }

    public BaseHttpClient(String url, String userId, String password) {
        setUrl(url);
        setNeedsAuthentication(true);
        setUserId(userId);
        setPassword(password);
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public boolean isNeedsAuthentication() {
        return needsAuthentication;
    }

    public void setNeedsAuthentication(boolean needsAuthentication) {
        this.needsAuthentication = needsAuthentication;
    }

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public JsonElement doGetJson(String path) throws HttpException, IOException {
        return doGetJson(getUrl(), path);
    }

    @SuppressWarnings("deprecation")
    public JsonElement doGetJson(String url, String path) throws HttpException, IOException {
        GetMethod get = new GetMethod(url + path);
        if (isNeedsAuthentication()) {
            get.setDoAuthentication(true);
        }
        int executeMethod = getHttpClient().executeMethod(get);
        switch (executeMethod) {
        case HttpStatus.SC_OK:
            JsonElement jsonElement = new JsonParser()
                    .parse(new JsonReader(new InputStreamReader(get.getResponseBodyAsStream())));
            return jsonElement;
        case HttpStatus.SC_NOT_FOUND:
            return null;
        default:
            HttpException httpException = new HttpException(get.getResponseBodyAsString());
            httpException.setReason(HttpStatus.getStatusText(executeMethod));
            httpException.setReasonCode(executeMethod);
            throw httpException;
        }
    }

    public String doGet(String path) throws HttpException, IOException {
        GetMethod get = new GetMethod(url + path);
        if (isNeedsAuthentication()) {
            get.setDoAuthentication(true);
        }
        int executeMethod = getHttpClient().executeMethod(get);
        switch (executeMethod) {
        case HttpStatus.SC_OK:
            return get.getResponseBodyAsString();
        default:
            break;
        }
        return null;
    }

    private HttpClient getHttpClient() {
        if (httpClient == null) {
            httpClient = new HttpClient();
        }
        if (isNeedsAuthentication()) {
            httpClient.getState().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT),
                    new UsernamePasswordCredentials(getUserId(), getPassword()));
            httpClient.getParams().setAuthenticationPreemptive(true);
        }
        return httpClient;
    }
}