package com.cku.oa.sys.util;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Title: com.cab.business.modules.common.util
 * Description:
 * Company: cab
 *
 * @author yuanshuai
 * @date 2020/9/22 13:59
 */
public class HttpUtils {
	/**
	 * get
	 *
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doGet(String host, String path, String method,
									 Map<String, String> headers,
									 Map<String, String> querys)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpGet request = new HttpGet(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		return httpClient.execute(request);
	}

	/**
	 * post form
	 *
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @param bodys
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doPost(String host, String path, String method,
									  Map<String, String> headers,
									  Map<String, String> querys,
									  Map<String, String> bodys)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPost request = new HttpPost(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (bodys != null) {
			List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();

			for (String key : bodys.keySet()) {
				nameValuePairList.add(new BasicNameValuePair(key, bodys.get(key)));
			}
			UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(nameValuePairList, "utf-8");
			formEntity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
			request.setEntity(formEntity);
		}

		return httpClient.execute(request);
	}

	/**
	 * Post String
	 *
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @param body
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doPost(String host, String path, String method,
									  Map<String, String> headers,
									  Map<String, String> querys,
									  String body)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPost request = new HttpPost(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (StringUtils.isNotBlank(body)) {
			request.setEntity(new StringEntity(body, "utf-8"));
		}

		return httpClient.execute(request);
	}

	/**
	 * Post stream
	 *
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @param body
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doPost(String host, String path, String method,
									  Map<String, String> headers,
									  Map<String, String> querys,
									  byte[] body)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPost request = new HttpPost(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (body != null) {
			request.setEntity(new ByteArrayEntity(body));
		}

		return httpClient.execute(request);
	}

	/**
	 * Put String
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @param body
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doPut(String host, String path, String method,
									 Map<String, String> headers,
									 Map<String, String> querys,
									 String body)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPut request = new HttpPut(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (StringUtils.isNotBlank(body)) {
			request.setEntity(new StringEntity(body, "utf-8"));
		}

		return httpClient.execute(request);
	}

	/**
	 * Put stream
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @param body
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doPut(String host, String path, String method,
									 Map<String, String> headers,
									 Map<String, String> querys,
									 byte[] body)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPut request = new HttpPut(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (body != null) {
			request.setEntity(new ByteArrayEntity(body));
		}

		return httpClient.execute(request);
	}

	/**
	 * Delete
	 *
	 * @param host
	 * @param path
	 * @param method
	 * @param headers
	 * @param querys
	 * @return
	 * @throws Exception
	 */
	public static HttpResponse doDelete(String host, String path, String method,
										Map<String, String> headers,
										Map<String, String> querys)
			throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpDelete request = new HttpDelete(buildUrl(host, path, querys));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		return httpClient.execute(request);
	}

	private static String buildUrl(String host, String path, Map<String, String> querys) throws UnsupportedEncodingException {
		StringBuilder sbUrl = new StringBuilder();
		sbUrl.append(host);
		if (!StringUtils.isBlank(path)) {
			sbUrl.append(path);
		}
		if (null != querys) {
			StringBuilder sbQuery = new StringBuilder();
			for (Map.Entry<String, String> query : querys.entrySet()) {
				if (0 < sbQuery.length()) {
					sbQuery.append("&");
				}
				if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
					sbQuery.append(query.getValue());
				}
				if (!StringUtils.isBlank(query.getKey())) {
					sbQuery.append(query.getKey());
					if (!StringUtils.isBlank(query.getValue())) {
						sbQuery.append("=");
						sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
					}
				}
			}
			if (0 < sbQuery.length()) {
				sbUrl.append("?").append(sbQuery);
			}
		}

		return sbUrl.toString();
	}

	private static HttpClient wrapClient(String host) {
		HttpClient httpClient = new DefaultHttpClient();
		if (host.startsWith("https://")) {
			sslClient(httpClient);
		}

		return httpClient;
	}

	private static void sslClient(HttpClient httpClient) {
		try {
			SSLContext ctx = SSLContext.getInstance("TLS");
			X509TrustManager tm = new X509TrustManager() {
				public X509Certificate[] getAcceptedIssuers() {
					return null;
				}
				public void checkClientTrusted(X509Certificate[] xcs, String str) {

				}
				public void checkServerTrusted(X509Certificate[] xcs, String str) {

				}
			};
			ctx.init(null, new TrustManager[] { tm }, null);
			SSLSocketFactory ssf = new SSLSocketFactory(ctx);
			ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
			ClientConnectionManager ccm = httpClient.getConnectionManager();
			SchemeRegistry registry = ccm.getSchemeRegistry();
			registry.register(new Scheme("https", 443, ssf));
		} catch (KeyManagementException ex) {
			throw new RuntimeException(ex);
		} catch (NoSuchAlgorithmException ex) {
			throw new RuntimeException(ex);
		}
	}
}
