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/**
 * Copyright (c) 2012-2016, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.weixinhttpclient451;

import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.HttpClientUtils;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.InputStreamBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.tinygroup.commons.file.IOUtils;
import org.tinygroup.logger.LogLevel;
import org.tinygroup.logger.Logger;
import org.tinygroup.logger.LoggerFactory;
import org.tinygroup.vfs.FileObject;
import org.tinygroup.vfs.VFS;
import org.tinygroup.weixinhttp.WeiXinHttpConnector;
import org.tinygroup.weixinhttp.WeiXinHttpUpload;
import org.tinygroup.weixinhttp.cert.WeiXinCert;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.security.KeyStore;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

/**
 * 微信基于httpclient4.5.1的实现
 */
public class HttpConnectorDefault implements WeiXinHttpConnector {

    private static final Logger LOGGER = LoggerFactory
            .getLogger(HttpConnectorDefault.class);

    private Map headerMap = new HashMap();
    private CloseableHttpClient client;

    private String responseCharset = "UTF-8";
    private String requestCharset = "ISO-8859-1";
    private int timeout = 5000;

    public HttpConnectorDefault() {
        init();
    }

    protected void init() {
        headerMap.put("Accept", "text/html, application/xhtml+xml, */*");
        headerMap.put("Accept-Language", "zh-CN,en-US;q=0.5");
        headerMap
                .put("User-Agent",
                        "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)");
        headerMap.put("Accept-Encoding", "gzip, deflate");
        headerMap.put("Connection", "Keep-Alive");

        client = HttpClients.createDefault();
    }


    public String getUrl(String url) {
        HttpGet httpRequest = new HttpGet(url);
        try {
            for (Entry entry : headerMap.entrySet()) {
                httpRequest.addHeader(entry.getKey(), entry.getValue());
            }
            return execute(client, httpRequest);
        } finally {
            httpRequest.releaseConnection();
        }

    }

    public String postUrl(String url, String content, WeiXinCert cert) {
        if (cert == null) {
            return postUrl(url, content, client);
        } else {
            CloseableHttpClient certClient = getCertHttpClient(cert);
            return postUrl(url, content, certClient);
        }
    }

    /**
     * 获得绑定证书的CloseableHttpClient
     *
     * @param cert
     * @return
     */
    private CloseableHttpClient getCertHttpClient(WeiXinCert cert) {
        try {
            KeyStore keyStore = KeyStore.getInstance(cert.getCertType());
            FileObject certObjcet = VFS.resolveFile(cert.getCertPath());
            char[] password = cert.getPassword().toCharArray();
            try {
                keyStore.load(certObjcet.getInputStream(), password);
            } finally {
                certObjcet.clean();
            }
            KeyManagerFactory factory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            factory.init(keyStore, password);

            // Trust own CA and all self-signed certs
            SSLContext sslcontext = SSLContext.getInstance("TLS");
            sslcontext.init(factory.getKeyManagers(), null, null);

            // Allow TLSv1 protocol only
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext);
            CloseableHttpClient httpclient = HttpClients.custom()
                    .setSSLSocketFactory(sslsf)
                    .build();

            return httpclient;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    private String postUrl(String url, String content, CloseableHttpClient client) {
        HttpPost httpRequest = new HttpPost(url);
        HttpEntity entity = new StringEntity(content, requestCharset);
        httpRequest.setEntity(entity);
        try {
            for (Entry entry : headerMap.entrySet()) {
                httpRequest.addHeader(entry.getKey(), entry.getValue());
            }
            return execute(client, httpRequest);
        } finally {
            httpRequest.releaseConnection();
        }
    }

    private String execute(CloseableHttpClient client, HttpRequestBase httpRequest) {
        CloseableHttpResponse response = null;
        try {
            response = client.execute(httpRequest);
            int status = response.getStatusLine().getStatusCode();
            if (status == HttpStatus.SC_OK) {
                LOGGER.logMessage(LogLevel.DEBUG, "结果成功返回。");
                InputStream stream = response.getEntity().getContent();
                return IOUtils.readFromInputStream(stream, responseCharset);
            } else {
                LOGGER.logMessage(LogLevel.ERROR, "结果返回失败，原因：{}", response.getStatusLine().toString());
                throw new RuntimeException(response.getStatusLine().toString());
            }
        } catch (Exception e) {
            LOGGER.logMessage(LogLevel.DEBUG, "结果返回失败，原因：{}", e.getMessage());
            throw new RuntimeException(e);
        } finally {
            HttpClientUtils.closeQuietly(response);
        }
    }

    public String getResponseCharset() {
        return responseCharset;
    }


    public void setResponseCharset(String responseCharset) {
        this.responseCharset = responseCharset;
    }


    public String getRequestCharset() {
        return requestCharset;
    }


    public void setRequestCharset(String requestCharset) {
        this.requestCharset = requestCharset;
    }


    public int getTimeout() {
        return timeout;
    }


    public void setTimeout(int timeout) {
        this.timeout = timeout;
    }

    public String upload(String url, WeiXinHttpUpload upload) {
        HttpPost httpRequest = new HttpPost(url);

        MultipartEntityBuilder builder = MultipartEntityBuilder.create();

        //设置表单报文
        if (upload.getFormName() != null) {
            builder.addTextBody(upload.getFormName(), upload.getContent());
        }

        //设置文件流
        builder.addPart(upload.getFileName(), new InputStreamBody(upload.getFileObject().getInputStream(), upload.getFileObject().getFileName()));

        //生成HttpEntity实体
        HttpEntity entity = builder.build();

        httpRequest.setEntity(entity);
        try {
            for (Entry entry : headerMap.entrySet()) {
                httpRequest.addHeader(entry.getKey(), entry.getValue());
            }
            return execute(client, httpRequest);
        } finally {
            httpRequest.releaseConnection();
        }
    }


}