OtherUtils.java

/*
 * Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
 *
 * 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.robam.xutils.Utils;

import android.text.TextUtils;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.protocol.HTTP;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.security.cert.X509Certificate;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class OtherUtils {
    private OtherUtils() {
    }

    /**
     * 是否支持Http分段.分段标志在Http头有两个地方识别.1.Accept_Ranges.2.Content-Range.
     * 支持分段的都有bytes标志
     *
     * @param response Http响应头
     * @return true支持, false不支持
     */
    public static boolean isSupportRange(final HttpResponse response) {
        if (response == null) {
            return false;
        }
        Header header = response.getFirstHeader("Accept-Ranges");
        if (header != null) {
            return "bytes".equals(header.getValue());
        }
        header = response.getFirstHeader("Content-Range");
        if (header != null) {
            String value = header.getValue();
            return value != null && value.startsWith("bytes");
        }
        return false;
    }

    /**
     * 从Http响应获取文件名
     *
     * @param response Http响应
     * @return 文件名
     */
    public static String getFileNameFromHttpResponse(final HttpResponse response) {
        if (response == null) return null;
        String result = null;
        Header header = response.getFirstHeader("Content-Disposition");
        if (header != null) {
            for (HeaderElement element : header.getElements()) {
                NameValuePair fileNamePair = element.getParameterByName("filename");
                if (fileNamePair != null) {
                    result = fileNamePair.getValue();
                    // try to get correct encoding str
                    result = CharsetUtils.toCharset(result, HTTP.UTF_8, result.length());
                    break;
                }
            }
        }
        return result;
    }

    /**
     * 获取HTTP字符集
     *
     * @param request HTTP
     * @return 字符集
     */
    public static Charset getCharsetFromHttpRequest(final HttpRequestBase request) {
        if (request == null) return null;
        String charsetName = null;
        Header header = request.getFirstHeader("Content-Type");
        if (header != null) {
            for (HeaderElement element : header.getElements()) {
                NameValuePair charsetPair = element.getParameterByName("charset");
                if (charsetPair != null) {
                    charsetName = charsetPair.getValue();
                    break;
                }
            }
        }

        boolean isSupportedCharset = false;
        if (!TextUtils.isEmpty(charsetName)) {
            try {
                isSupportedCharset = Charset.isSupported(charsetName);
            } catch (Throwable e) {
            }
        }

        return isSupportedCharset ? Charset.forName(charsetName) : null;
    }

    private static final int STRING_BUFFER_LENGTH = 100;

    public static long sizeOfString(final String str, String charset) throws UnsupportedEncodingException {
        if (TextUtils.isEmpty(str)) {
            return 0;
        }
        int len = str.length();
        if (len < STRING_BUFFER_LENGTH) {
            return str.getBytes(charset).length;
        }
        long size = 0;
        for (int i = 0; i < len; i += STRING_BUFFER_LENGTH) {
            int end = i + STRING_BUFFER_LENGTH;
            end = end < len ? end : len;
            String temp = getSubString(str, i, end);
            size += temp.getBytes(charset).length;
        }
        return size;
    }

    // get the sub string for large string
    public static String getSubString(final String str, int start, int end) {
        return new String(str.substring(start, end));
    }

    public static StackTraceElement getCurrentStackTraceElement() {
        return Thread.currentThread().getStackTrace()[3];
    }

    public static StackTraceElement getCallerStackTraceElement() {
        return Thread.currentThread().getStackTrace()[4];
    }

    private static TrustManager[] trustAllCerts;

    /**
     *
     */
    public static void trustAllSSLForHttpsURLConnection() {
        // Create a trust manager that does not validate certificate chains
        if (trustAllCerts == null) {
            trustAllCerts = new TrustManager[]{new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }

                public void checkClientTrusted(X509Certificate[] certs, String authType) {
                }

                public void checkServerTrusted(X509Certificate[] certs, String authType) {
                }
            }};
        }
        // Install the all-trusting trust manager
        final SSLContext sslContext;
        try {
            sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustAllCerts, null);
            HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
        } catch (Throwable e) {
            LogUtils.e(e.getMessage(), e);
        }
        HttpsURLConnection.setDefaultHostnameVerifier(org.apache.http.conn.ssl.SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
    }
}