/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * 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 android.net;


import android.os.Parcel;
import android.os.Parcelable;
import android.text.TextUtils;

import java.net.InetSocketAddress;
import java.net.URLConnection;
import java.util.List;
import java.util.Locale;

Describes a proxy configuration. Proxy configurations are already integrated within the java.net and Apache HTTP stack. So URLConnection and Apache's HttpClient will use them automatically. Other HTTP stacks will need to obtain the proxy info from Proxy.PROXY_CHANGE_ACTION broadcast as the extra Proxy.EXTRA_PROXY_INFO. /**
 * Describes a proxy configuration.
 *
 * Proxy configurations are already integrated within the {@code java.net} and
 * Apache HTTP stack. So {@link URLConnection} and Apache's {@code HttpClient} will use
 * them automatically.
 *
 * Other HTTP stacks will need to obtain the proxy info from
 * {@link Proxy#PROXY_CHANGE_ACTION} broadcast as the extra {@link Proxy#EXTRA_PROXY_INFO}.
 */
public class ProxyInfo implements Parcelable {

    private String mHost;
    private int mPort;
    private String mExclusionList;
    private String[] mParsedExclusionList;

    private Uri mPacFileUrl;
    
@hide
/**
     *@hide
     */
    public static final String LOCAL_EXCL_LIST = "";
    
@hide
/**
     *@hide
     */
    public static final int LOCAL_PORT = -1;
    
@hide
/**
     *@hide
     */
    public static final String LOCAL_HOST = "localhost";

    
Constructs a ProxyInfo object that points at a Direct proxy on the specified host and port. /**
     * Constructs a {@link ProxyInfo} object that points at a Direct proxy
     * on the specified host and port.
     */
    public static ProxyInfo buildDirectProxy(String host, int port) {
        return new ProxyInfo(host, port, null);
    }

    
Constructs a ProxyInfo object that points at a Direct proxy on the specified host and port. The proxy will not be used to access any host in exclusion list, exclList. 
Params:
exclList – Hosts to exclude using the proxy on connections for.  These
                hosts can use wildcards such as *.example.com./**
     * Constructs a {@link ProxyInfo} object that points at a Direct proxy
     * on the specified host and port.
     *
     * The proxy will not be used to access any host in exclusion list, exclList.
     *
     * @param exclList Hosts to exclude using the proxy on connections for.  These
     *                 hosts can use wildcards such as *.example.com.
     */
    public static ProxyInfo buildDirectProxy(String host, int port, List<String> exclList) {
        String[] array = exclList.toArray(new String[exclList.size()]);
        return new ProxyInfo(host, port, TextUtils.join(",", array), array);
    }

    
Construct a ProxyInfo that will download and run the PAC script at the specified URL. /**
     * Construct a {@link ProxyInfo} that will download and run the PAC script
     * at the specified URL.
     */
    public static ProxyInfo buildPacProxy(Uri pacUri) {
        return new ProxyInfo(pacUri);
    }

    
Create a ProxyProperties that points at a HTTP Proxy.
@hide
/**
     * Create a ProxyProperties that points at a HTTP Proxy.
     * @hide
     */
    public ProxyInfo(String host, int port, String exclList) {
        mHost = host;
        mPort = port;
        setExclusionList(exclList);
        mPacFileUrl = Uri.EMPTY;
    }

    
Create a ProxyProperties that points at a PAC URL.
@hide
/**
     * Create a ProxyProperties that points at a PAC URL.
     * @hide
     */
    public ProxyInfo(Uri pacFileUrl) {
        mHost = LOCAL_HOST;
        mPort = LOCAL_PORT;
        setExclusionList(LOCAL_EXCL_LIST);
        if (pacFileUrl == null) {
            throw new NullPointerException();
        }
        mPacFileUrl = pacFileUrl;
    }

    
Create a ProxyProperties that points at a PAC URL.
@hide
/**
     * Create a ProxyProperties that points at a PAC URL.
     * @hide
     */
    public ProxyInfo(String pacFileUrl) {
        mHost = LOCAL_HOST;
        mPort = LOCAL_PORT;
        setExclusionList(LOCAL_EXCL_LIST);
        mPacFileUrl = Uri.parse(pacFileUrl);
    }

    
Only used in PacManager after Local Proxy is bound.
@hide
/**
     * Only used in PacManager after Local Proxy is bound.
     * @hide
     */
    public ProxyInfo(Uri pacFileUrl, int localProxyPort) {
        mHost = LOCAL_HOST;
        mPort = localProxyPort;
        setExclusionList(LOCAL_EXCL_LIST);
        if (pacFileUrl == null) {
            throw new NullPointerException();
        }
        mPacFileUrl = pacFileUrl;
    }

    private ProxyInfo(String host, int port, String exclList, String[] parsedExclList) {
        mHost = host;
        mPort = port;
        mExclusionList = exclList;
        mParsedExclusionList = parsedExclList;
        mPacFileUrl = Uri.EMPTY;
    }

    // copy constructor instead of clone
    
@hide
/**
     * @hide
     */
    public ProxyInfo(ProxyInfo source) {
        if (source != null) {
            mHost = source.getHost();
            mPort = source.getPort();
            mPacFileUrl = source.mPacFileUrl;
            mExclusionList = source.getExclusionListAsString();
            mParsedExclusionList = source.mParsedExclusionList;
        } else {
            mPacFileUrl = Uri.EMPTY;
        }
    }

    
@hide
/**
     * @hide
     */
    public InetSocketAddress getSocketAddress() {
        InetSocketAddress inetSocketAddress = null;
        try {
            inetSocketAddress = new InetSocketAddress(mHost, mPort);
        } catch (IllegalArgumentException e) { }
        return inetSocketAddress;
    }

    
Returns the URL of the current PAC script or null if there is
no PAC script.
/**
     * Returns the URL of the current PAC script or null if there is
     * no PAC script.
     */
    public Uri getPacFileUrl() {
        return mPacFileUrl;
    }

    
When configured to use a Direct Proxy this returns the host
of the proxy.
/**
     * When configured to use a Direct Proxy this returns the host
     * of the proxy.
     */
    public String getHost() {
        return mHost;
    }

    
When configured to use a Direct Proxy this returns the port
of the proxy
/**
     * When configured to use a Direct Proxy this returns the port
     * of the proxy
     */
    public int getPort() {
        return mPort;
    }

    
When configured to use a Direct Proxy this returns the list
of hosts for which the proxy is ignored.
/**
     * When configured to use a Direct Proxy this returns the list
     * of hosts for which the proxy is ignored.
     */
    public String[] getExclusionList() {
        return mParsedExclusionList;
    }

    
comma separated
@hide
/**
     * comma separated
     * @hide
     */
    public String getExclusionListAsString() {
        return mExclusionList;
    }

    // comma separated
    private void setExclusionList(String exclusionList) {
        mExclusionList = exclusionList;
        if (mExclusionList == null) {
            mParsedExclusionList = new String[0];
        } else {
            mParsedExclusionList = exclusionList.toLowerCase(Locale.ROOT).split(",");
        }
    }

    
@hide
/**
     * @hide
     */
    public boolean isValid() {
        if (!Uri.EMPTY.equals(mPacFileUrl)) return true;
        return Proxy.PROXY_VALID == Proxy.validate(mHost == null ? "" : mHost,
                                                mPort == 0 ? "" : Integer.toString(mPort),
                                                mExclusionList == null ? "" : mExclusionList);
    }

    
@hide
/**
     * @hide
     */
    public java.net.Proxy makeProxy() {
        java.net.Proxy proxy = java.net.Proxy.NO_PROXY;
        if (mHost != null) {
            try {
                InetSocketAddress inetSocketAddress = new InetSocketAddress(mHost, mPort);
                proxy = new java.net.Proxy(java.net.Proxy.Type.HTTP, inetSocketAddress);
            } catch (IllegalArgumentException e) {
            }
        }
        return proxy;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        if (!Uri.EMPTY.equals(mPacFileUrl)) {
            sb.append("PAC Script: ");
            sb.append(mPacFileUrl);
        }
        if (mHost != null) {
            sb.append("[");
            sb.append(mHost);
            sb.append("] ");
            sb.append(Integer.toString(mPort));
            if (mExclusionList != null) {
                    sb.append(" xl=").append(mExclusionList);
            }
        } else {
            sb.append("[ProxyProperties.mHost == null]");
        }
        return sb.toString();
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof ProxyInfo)) return false;
        ProxyInfo p = (ProxyInfo)o;
        // If PAC URL is present in either then they must be equal.
        // Other parameters will only be for fall back.
        if (!Uri.EMPTY.equals(mPacFileUrl)) {
            return mPacFileUrl.equals(p.getPacFileUrl()) && mPort == p.mPort;
        }
        if (!Uri.EMPTY.equals(p.mPacFileUrl)) {
            return false;
        }
        if (mExclusionList != null && !mExclusionList.equals(p.getExclusionListAsString())) {
            return false;
        }
        if (mHost != null && p.getHost() != null && mHost.equals(p.getHost()) == false) {
            return false;
        }
        if (mHost != null && p.mHost == null) return false;
        if (mHost == null && p.mHost != null) return false;
        if (mPort != p.mPort) return false;
        return true;
    }

    
Implement the Parcelable interface
@hide
/**
     * Implement the Parcelable interface
     * @hide
     */
    public int describeContents() {
        return 0;
    }

    @Override
    /*
     * generate hashcode based on significant fields
     */
    public int hashCode() {
        return ((null == mHost) ? 0 : mHost.hashCode())
        + ((null == mExclusionList) ? 0 : mExclusionList.hashCode())
        + mPort;
    }

    
Implement the Parcelable interface.
@hide
/**
     * Implement the Parcelable interface.
     * @hide
     */
    public void writeToParcel(Parcel dest, int flags) {
        if (!Uri.EMPTY.equals(mPacFileUrl)) {
            dest.writeByte((byte)1);
            mPacFileUrl.writeToParcel(dest, 0);
            dest.writeInt(mPort);
            return;
        } else {
            dest.writeByte((byte)0);
        }
        if (mHost != null) {
            dest.writeByte((byte)1);
            dest.writeString(mHost);
            dest.writeInt(mPort);
        } else {
            dest.writeByte((byte)0);
        }
        dest.writeString(mExclusionList);
        dest.writeStringArray(mParsedExclusionList);
    }

    public static final Creator<ProxyInfo> CREATOR =
        new Creator<ProxyInfo>() {
            public ProxyInfo createFromParcel(Parcel in) {
                String host = null;
                int port = 0;
                if (in.readByte() != 0) {
                    Uri url = Uri.CREATOR.createFromParcel(in);
                    int localPort = in.readInt();
                    return new ProxyInfo(url, localPort);
                }
                if (in.readByte() != 0) {
                    host = in.readString();
                    port = in.readInt();
                }
                String exclList = in.readString();
                String[] parsedExclList = in.readStringArray();
                ProxyInfo proxyProperties =
                        new ProxyInfo(host, port, exclList, parsedExclList);
                return proxyProperties;
            }

            public ProxyInfo[] newArray(int size) {
                return new ProxyInfo[size];
            }
        };
}