/*
* Copyright (C) 2007-2008 Esmertec AG.
* Copyright (C) 2007-2008 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 com.android.mms.transaction;
import com.android.mms.util.SendingProgressTokenManager;
import android.content.Context;
import android.net.Uri;
import android.net.ConnectivityManager;
import android.util.Log;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* Transaction is an abstract class for notification transaction, send transaction
* and other transactions described in MMS spec.
* It provides the interfaces of them and some common methods for them.
*/
public abstract class Transaction extends Observable {
private final int mServiceId;
protected Context mContext;
protected String mId;
protected TransactionState mTransactionState;
protected TransactionSettings mTransactionSettings;
/**
* Identifies push requests.
*/
public static final int NOTIFICATION_TRANSACTION = 0;
/**
* Identifies deferred retrieve requests.
*/
public static final int RETRIEVE_TRANSACTION = 1;
/**
* Identifies send multimedia message requests.
*/
public static final int SEND_TRANSACTION = 2;
/**
* Identifies send read report requests.
*/
public static final int READREC_TRANSACTION = 3;
public Transaction(Context context, int serviceId,
TransactionSettings settings) {
mContext = context;
mTransactionState = new TransactionState();
mServiceId = serviceId;
mTransactionSettings = settings;
}
/**
* Returns the transaction state of this transaction.
*
* @return Current state of the Transaction.
*/
@Override
public TransactionState getState() {
return mTransactionState;
}
/**
* An instance of Transaction encapsulates the actions required
* during a MMS Client transaction.
*/
public abstract void process();
/**
* Used to determine whether a transaction is equivalent to this instance.
*
* @param transaction the transaction which is compared to this instance.
* @return true if transaction is equivalent to this instance, false otherwise.
*/
public boolean isEquivalent(Transaction transaction) {
return getClass().equals(transaction.getClass())
&& mId.equals(transaction.mId);
}
/**
* Get the service-id of this transaction which was assigned by the framework.
* @return the service-id of the transaction
*/
public int getServiceId() {
return mServiceId;
}
public TransactionSettings getConnectionSettings() {
return mTransactionSettings;
}
public void setConnectionSettings(TransactionSettings settings) {
mTransactionSettings = settings;
}
/**
* A common method to send a PDU to MMSC.
*
* @param pdu A byte array which contains the data of the PDU.
* @return A byte array which contains the response data.
* If an HTTP error code is returned, an IOException will be thrown.
* @throws IOException if any error occurred on network interface or
* an HTTP error code(>=400) returned from the server.
*/
protected byte[] sendPdu(byte[] pdu) throws IOException {
return sendPdu(SendingProgressTokenManager.NO_TOKEN, pdu,
mTransactionSettings.getMmscUrl());
}
/**
* A common method to send a PDU to MMSC.
*
* @param pdu A byte array which contains the data of the PDU.
* @param mmscUrl Url of the recipient MMSC.
* @return A byte array which contains the response data.
* If an HTTP error code is returned, an IOException will be thrown.
* @throws IOException if any error occurred on network interface or
* an HTTP error code(>=400) returned from the server.
*/
protected byte[] sendPdu(byte[] pdu, String mmscUrl) throws IOException {
return sendPdu(SendingProgressTokenManager.NO_TOKEN, pdu, mmscUrl);
}
/**
* A common method to send a PDU to MMSC.
*
* @param token The token to identify the sending progress.
* @param pdu A byte array which contains the data of the PDU.
* @return A byte array which contains the response data.
* If an HTTP error code is returned, an IOException will be thrown.
* @throws IOException if any error occurred on network interface or
* an HTTP error code(>=400) returned from the server.
*/
protected byte[] sendPdu(long token, byte[] pdu) throws IOException {
return sendPdu(token, pdu, mTransactionSettings.getMmscUrl());
}
/**
* A common method to send a PDU to MMSC.
*
* @param token The token to identify the sending progress.
* @param pdu A byte array which contains the data of the PDU.
* @param mmscUrl Url of the recipient MMSC.
* @return A byte array which contains the response data.
* If an HTTP error code is returned, an IOException will be thrown.
* @throws IOException if any error occurred on network interface or
* an HTTP error code(>=400) returned from the server.
*/
protected byte[] sendPdu(long token, byte[] pdu, String mmscUrl) throws IOException {
ensureRouteToHost(mmscUrl, mTransactionSettings);
return HttpUtils.httpConnection(
mContext, token,
mmscUrl,
pdu, HttpUtils.HTTP_POST_METHOD,
mTransactionSettings.isProxySet(),
mTransactionSettings.getProxyAddress(),
mTransactionSettings.getProxyPort());
}
/**
* A common method to retrieve a PDU from MMSC.
*
* @param url The URL of the message which we are going to retrieve.
* @return A byte array which contains the data of the PDU.
* If the status code is not correct, an IOException will be thrown.
* @throws IOException if any error occurred on network interface or
* an HTTP error code(>=400) returned from the server.
*/
protected byte[] getPdu(String url) throws IOException {
ensureRouteToHost(url, mTransactionSettings);
return HttpUtils.httpConnection(
mContext, SendingProgressTokenManager.NO_TOKEN,
url, null, HttpUtils.HTTP_GET_METHOD,
mTransactionSettings.isProxySet(),
mTransactionSettings.getProxyAddress(),
mTransactionSettings.getProxyPort());
}
/**
* Make sure that a network route exists to allow us to reach the host in the
* supplied URL, and to the MMS proxy host as well, if a proxy is used.
* @param url The URL of the MMSC to which we need a route
* @param settings Specifies the address of the proxy host, if any
* @throws IOException if the host doesn't exist, or adding the route fails.
*/
private void ensureRouteToHost(String url, TransactionSettings settings) throws IOException {
ConnectivityManager connMgr =
(ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
int inetAddr;
if (settings.isProxySet()) {
String proxyAddr = settings.getProxyAddress();
inetAddr = lookupHost(proxyAddr);
if (inetAddr == -1) {
throw new IOException("Cannot establish route for " + url + ": Unknown host");
} else {
if (!connMgr.requestRouteToHost(
ConnectivityManager.TYPE_MOBILE_MMS, inetAddr)) {
throw new IOException("Cannot establish route to proxy " + inetAddr);
}
}
} else {
Uri uri = Uri.parse(url);
inetAddr = lookupHost(uri.getHost());
if (inetAddr == -1) {
throw new IOException("Cannot establish route for " + url + ": Unknown host");
} else {
if (!connMgr.requestRouteToHost(
ConnectivityManager.TYPE_MOBILE_MMS, inetAddr)) {
throw new IOException("Cannot establish route to " + inetAddr + " for " + url);
}
}
}
}
/**
* Look up a host name and return the result as an int. Works if the argument
* is an IP address in dot notation. Obviously, this can only be used for IPv4
* addresses.
* @param hostname the name of the host (or the IP address)
* @return the IP address as an {@code int} in network byte order
*/
// TODO: move this to android-common
public static int lookupHost(String hostname) {
InetAddress inetAddress;
try {
inetAddress = InetAddress.getByName(hostname);
} catch (UnknownHostException e) {
return -1;
}
byte[] addrBytes;
int addr;
addrBytes = inetAddress.getAddress();
addr = ((addrBytes[3] & 0xff) << 24)
| ((addrBytes[2] & 0xff) << 16)
| ((addrBytes[1] & 0xff) << 8)
| (addrBytes[0] & 0xff);
return addr;
}
@Override
public String toString() {
return getClass().getName() + ": serviceId=" + mServiceId;
}
/**
* Get the type of the transaction.
*
* @return Transaction type in integer.
*/
abstract public int getType();
}