com.psiphon3.psiphonlibrary.UpstreamProxySettings.java Source code

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Here is the source code for com.psiphon3.psiphonlibrary.UpstreamProxySettings.java

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/*
 * Copyright (c) 2016, Psiphon Inc.
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.psiphon3.psiphonlibrary;

import android.content.Context;
import android.os.Build;
import android.text.TextUtils;

import com.psiphon3.R;

import net.grandcentrix.tray.AppPreferences;

import org.apache.http.auth.Credentials;
import org.apache.http.auth.NTCredentials;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class UpstreamProxySettings {

    private static boolean m_isSystemProxySaved = false;
    private static ProxySettings m_savedProxySettings = null;

    public static synchronized boolean getUseHTTPProxy(Context context) {
        return new AppPreferences(context).getBoolean(context.getString(R.string.useProxySettingsPreference),
                false);
    }

    public static synchronized boolean getUseSystemProxySettings(Context context) {
        return new AppPreferences(context).getBoolean(context.getString(R.string.useSystemProxySettingsPreference),
                false);
    }

    public static synchronized boolean getUseCustomProxySettings(Context context) {
        return new AppPreferences(context).getBoolean(context.getString(R.string.useCustomProxySettingsPreference),
                false);
    }

    public static synchronized String getCustomProxyHost(Context context) {
        return new AppPreferences(context)
                .getString(context.getString(R.string.useCustomProxySettingsHostPreference), "");
    }

    public static synchronized String getCustomProxyPort(Context context) {
        return new AppPreferences(context)
                .getString(context.getString(R.string.useCustomProxySettingsPortPreference), "");
    }

    public static synchronized boolean getUseProxyAuthentication(Context context) {
        return new AppPreferences(context).getBoolean(context.getString(R.string.useProxyAuthenticationPreference),
                false);
    }

    public static synchronized String getProxyUsername(Context context) {
        return new AppPreferences(context).getString(context.getString(R.string.useProxyUsernamePreference), "");
    }

    public static synchronized String getProxyPassword(Context context) {
        return new AppPreferences(context).getString(context.getString(R.string.useProxyPasswordPreference), "");
    }

    public static synchronized String getProxyDomain(Context context) {
        return new AppPreferences(context).getString(context.getString(R.string.useProxyDomainPreference), "");
    }

    public static class ProxySettings {
        public String proxyHost;
        public int proxyPort;
    }

    // Call this before doing anything that could change the system proxy settings
    // (such as setting a WebView's proxy)
    public synchronized static void saveSystemProxySettings(Context context) {
        if (!m_isSystemProxySaved) {
            m_savedProxySettings = getSystemProxySettings(context);
            m_isSystemProxySaved = true;
        }
    }

    // Checks if we are supposed to use proxy settings, custom or system,
    // and if system, if any system proxy settings are configured.
    // Returns the user-requested proxy settings.
    public synchronized static ProxySettings getProxySettings(Context context) {
        if (!getUseHTTPProxy(context)) {
            return null;
        }

        ProxySettings settings = null;

        if (getUseCustomProxySettings(context)) {
            settings = new ProxySettings();

            settings.proxyHost = getCustomProxyHost(context);
            String port = getCustomProxyPort(context);
            try {
                settings.proxyPort = Integer.parseInt(port);
            } catch (NumberFormatException e) {
                settings.proxyPort = 0;
            }
        }

        if (getUseSystemProxySettings(context)) {
            if (m_isSystemProxySaved) {
                settings = m_savedProxySettings;
            } else {
                settings = getSystemProxySettings(context);
            }
        }

        return settings;
    }

    public synchronized static Credentials getProxyCredentials(Context context) {
        if (!getUseProxyAuthentication(context)) {
            return null;
        }

        String username = getProxyUsername(context);
        String password = getProxyPassword(context);
        String domain = getProxyDomain(context);

        if (username == null || username.trim().equals("")) {
            return null;
        }
        if (password == null || password.trim().equals("")) {
            return null;
        }
        if (domain == null || domain.trim().equals("")) {
            return new NTCredentials(username, password, "", "");
        }

        String localHost;
        try {
            localHost = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            localHost = "localhost";
        }

        return new NTCredentials(username, password, localHost, domain);
    }

    private static ProxySettings getSystemProxySettings(Context context) {
        ProxySettings settings = new ProxySettings();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            settings.proxyHost = System.getProperty("http.proxyHost");
            String port = System.getProperty("http.proxyPort");
            try {
                settings.proxyPort = Integer.parseInt(port);
            } catch (NumberFormatException e) {
                settings.proxyPort = 0;
            }
        } else {
            settings.proxyHost = android.net.Proxy.getHost(context);
            settings.proxyPort = android.net.Proxy.getPort(context);
        }

        if (TextUtils.isEmpty(settings.proxyHost) || settings.proxyPort <= 0) {
            settings = null;
        }

        return settings;
    }

    // Returns a tunnel-core compatible proxy URL for the
    // current user configured proxy settings.
    // e.g., http://NTDOMAIN\NTUser:password@proxyhost:3375,
    //       http://user:password@proxyhost:8080", etc.
    public synchronized static String getUpstreamProxyUrl(Context context) {
        ProxySettings proxySettings = getProxySettings(context);

        if (proxySettings == null) {
            return "";
        }

        StringBuilder url = new StringBuilder();
        url.append("http://");

        NTCredentials credentials = (NTCredentials) getProxyCredentials(context);

        if (credentials != null) {
            if (!credentials.getDomain().equals("")) {
                url.append(credentials.getDomain());
                url.append("\\");
            }
            url.append(credentials.getUserName());
            url.append(":");
            url.append(credentials.getPassword());
            url.append("@");
        }

        url.append(proxySettings.proxyHost);
        url.append(":");
        url.append(proxySettings.proxyPort);

        return url.toString();
    }
}