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/*
* Copyright (C) 2011 Markus Doits <markus.doits@googlemail.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.thialfihar.android.apg.deprecated;
import org.thialfihar.android.apg.deprecated.ApgConInterface.OnCallFinishListener;
import org.thialfihar.android.apg.deprecated.IApgService2;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.content.pm.ServiceInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.IBinder;
import org.thialfihar.android.apg.util.Log;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
/**
* A APG-AIDL-Wrapper
*
* <p>
* This class can be used by other projects to simplify connecting to the
* APG-AIDL-Service. Kind of wrapper of for AIDL.
* </p>
*
* <p>
* It is not used in this project.
* </p>
*
* @author Markus Doits <markus.doits@googlemail.com>
* @version 1.1rc1
*
*/
public class ApgCon {
private static final boolean LOCAL_LOGV = true;
private static final boolean LOCAL_LOGD = true;
private final static String TAG = "ApgCon";
private final static int API_VERSION = 2; // aidl api-version it expects
private final static String BLOB_URI = "content://org.thialfihar.android.apg.provider.apgserviceblobprovider";
/**
* How many seconds to wait for a connection to AGP when connecting.
* Being unsuccessful for this number of seconds, a connection
* is assumed to be failed.
*/
public int secondsToWaitForConnection = 15;
private class CallAsync extends AsyncTask<String, Void, Void> {
@Override
protected Void doInBackground(String... arg) {
if( LOCAL_LOGD ) Log.d(TAG, "Async execution starting");
call(arg[0]);
return null;
}
protected void onPostExecute(Void res) {
if( LOCAL_LOGD ) Log.d(TAG, "Async execution finished");
mAsyncRunning = false;
}
}
private final Context mContext;
private final error mConnectionStatus;
private boolean mAsyncRunning = false;
private OnCallFinishListener mOnCallFinishListener;
private final Bundle mResult = new Bundle();
private final Bundle mArgs = new Bundle();
private final ArrayList<String> mErrorList = new ArrayList<String>();
private final ArrayList<String> mWarningList = new ArrayList<String>();
/** Remote service for decrypting and encrypting data */
private IApgService2 mApgService = null;
/** Set apgService accordingly to connection status */
private ServiceConnection mApgConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
if( LOCAL_LOGD ) Log.d(TAG, "IApgService bound to apgService");
mApgService = IApgService2.Stub.asInterface(service);
}
public void onServiceDisconnected(ComponentName className) {
if( LOCAL_LOGD ) Log.d(TAG, "IApgService disconnected");
mApgService = null;
}
};
/**
* Different types of local errors
*/
public static enum error {
/**
* no error
*/
NO_ERROR,
/**
* generic error
*/
GENERIC,
/**
* connection to apg service not possible
*/
CANNOT_BIND_TO_APG,
/**
* function to call not provided
*/
CALL_MISSING,
/**
* apg service does not know what to do
*/
CALL_NOT_KNOWN,
/**
* could not find APG being installed
*/
APG_NOT_FOUND,
/**
* found APG but without AIDL interface
*/
APG_AIDL_MISSING,
/**
* found APG but with wrong API
*/
APG_API_MISSMATCH
}
private static enum ret {
ERROR, // returned from AIDL
RESULT, // returned from AIDL
WARNINGS, // mixed AIDL and LOCAL
ERRORS, // mixed AIDL and LOCAL
}
/**
* Constructor
*
* <p>
* Creates a new ApgCon object and searches for the right APG version on
* initialization. If not found, errors are printed to the error log.
* </p>
*
* @param ctx
* the running context
*/
public ApgCon(Context ctx) {
if( LOCAL_LOGV ) Log.v(TAG, "EncryptionService created");
mContext = ctx;
error tmpError = null;
try {
if( LOCAL_LOGV ) Log.v(TAG, "Searching for the right APG version");
ServiceInfo apgServices[] = ctx.getPackageManager().getPackageInfo("org.thialfihar.android.apg",
PackageManager.GET_SERVICES | PackageManager.GET_META_DATA).services;
if (apgServices == null) {
Log.e(TAG, "Could not fetch services");
tmpError = error.GENERIC;
} else {
boolean apgServiceFound = false;
for (ServiceInfo inf : apgServices) {
if( LOCAL_LOGV ) Log.v(TAG, "Found service of APG: " + inf.name);
if (inf.name.equals("org.thialfihar.android.apg.ApgService")) {
apgServiceFound = true;
if (inf.metaData == null) {
Log.w(TAG, "Could not determine ApgService API");
Log.w(TAG, "This probably won't work!");
mWarningList.add("(LOCAL) Could not determine ApgService API");
tmpError = error.APG_API_MISSMATCH;
} else if (inf.metaData.getInt("api_version") != API_VERSION) {
Log.w(TAG, "Found ApgService API version " + inf.metaData.getInt("api_version") + " but exspected " + API_VERSION);
Log.w(TAG, "This probably won't work!");
mWarningList.add("(LOCAL) Found ApgService API version " + inf.metaData.getInt("api_version") + " but exspected " + API_VERSION);
tmpError = error.APG_API_MISSMATCH;
} else {
if( LOCAL_LOGV ) Log.v(TAG, "Found api_version " + API_VERSION + ", everything should work");
tmpError = error.NO_ERROR;
}
}
}
if (!apgServiceFound) {
Log.e(TAG, "Could not find APG with AIDL interface, this probably won't work");
mErrorList.add("(LOCAL) Could not find APG with AIDL interface, this probably won't work");
mResult.putInt(ret.ERROR.name(), error.APG_AIDL_MISSING.ordinal());
tmpError = error.APG_NOT_FOUND;
}
}
} catch (PackageManager.NameNotFoundException e) {
Log.e(TAG, "Could not find APG, is it installed?", e);
mErrorList.add("(LOCAL) Could not find APG, is it installed?");
mResult.putInt(ret.ERROR.name(), error.APG_NOT_FOUND.ordinal());
tmpError = error.APG_NOT_FOUND;
}
mConnectionStatus = tmpError;
}
/** try to connect to the apg service */
private boolean connect() {
if( LOCAL_LOGV ) Log.v(TAG, "trying to bind the apgService to context");
if (mApgService != null) {
if( LOCAL_LOGV ) Log.v(TAG, "allready connected");
return true;
}
try {
mContext.bindService(new Intent(IApgService2.class.getName()), mApgConnection, Context.BIND_AUTO_CREATE);
} catch (Exception e) {
Log.e(TAG, "could not bind APG service", e);
return false;
}
int waitCount = 0;
while (mApgService == null && waitCount++ < secondsToWaitForConnection) {
if( LOCAL_LOGV ) Log.v(TAG, "sleeping 1 second to wait for apg");
android.os.SystemClock.sleep(1000);
}
if (waitCount >= secondsToWaitForConnection) {
if( LOCAL_LOGV ) Log.v(TAG, "slept waiting for nothing!");
return false;
}
return true;
}
/**
* Disconnects ApgCon from Apg
*
* <p>
* This should be called whenever all work with APG is done (e.g. everything
* you wanted to encrypt is encrypted), since connections with AIDL should
* not be upheld indefinitely.
* <p>
*
* <p>
* Also, if you destroy you end using your ApgCon-instance, this must be
* called or else the connection to APG is leaked
* </p>
*/
public void disconnect() {
if( LOCAL_LOGV ) Log.v(TAG, "disconnecting apgService");
if (mApgService != null) {
mContext.unbindService(mApgConnection);
mApgService = null;
}
}
private boolean initialize() {
if (mApgService == null) {
if (!connect()) {
if( LOCAL_LOGV ) Log.v(TAG, "connection to apg service failed");
return false;
}
}
return true;
}
/**
* Calls a function from APG's AIDL-interface
*
* <p>
* After you have set up everything with {@link #setArg(String, String)}
* (and variants), you can call a function of the AIDL-interface. This
* will:
* <ul>
* <li>start connection to the remote interface (if not already connected)</li>
* <li>call the function passed with all parameters synchronously</li>
* <li>set up everything to retrieve the result and/or warnings/errors</li>
* <li>call the callback if provided
* </ul>
* </p>
*
* <p>
* Note your thread will be blocked during execution - if you want to call
* the function asynchronously, see {@link #callAsync(String)}.
* </p>
*
* @param function
* a remote function to call
* @return true, if call successful (= no errors), else false
*
* @see #callAsync(String)
* @see #setArg(String, String)
* @see #setOnCallFinishListener(OnCallFinishListener)
*/
public boolean call(String function) {
boolean success = this.call(function, mArgs, mResult);
if (mOnCallFinishListener != null) {
try {
if( LOCAL_LOGD ) Log.d(TAG, "About to execute callback");
mOnCallFinishListener.onCallFinish(mResult);
if( LOCAL_LOGD ) Log.d(TAG, "Callback executed");
} catch (Exception e) {
Log.w(TAG, "Exception on callback: (" + e.getClass() + ") " + e.getMessage(), e);
mWarningList.add("(LOCAL) Could not execute callback (" + e.getClass() + "): " + e.getMessage());
}
}
return success;
}
/**
* Calls a function of remote interface asynchronously
*
* <p>
* This does exactly the same as {@link #call(String)}, but asynchronously.
* While connection to APG and work are done in background, your thread can
* go on executing.
* <p>
*
* <p>
* To see whether the task is finished, you have two possibilities:
* <ul>
* <li>In your thread, poll {@link #isRunning()}</li>
* <li>Supply a callback with {@link #setOnCallFinishListener(OnCallFinishListener)}</li>
* </ul>
* </p>
*
* @param function
* a remote function to call
*
* @see #call(String)
* @see #isRunning()
* @see #setOnCallFinishListener(OnCallFinishListener)
*/
public void callAsync(String function) {
mAsyncRunning = true;
new CallAsync().execute(function);
}
private boolean call(String function, Bundle pArgs, Bundle pReturn) {
if (!initialize()) {
mErrorList.add("(LOCAL) Cannot bind to ApgService");
mResult.putInt(ret.ERROR.name(), error.CANNOT_BIND_TO_APG.ordinal());
return false;
}
if (function == null || function.length() == 0) {
mErrorList.add("(LOCAL) Function to call missing");
mResult.putInt(ret.ERROR.name(), error.CALL_MISSING.ordinal());
return false;
}
try {
Boolean success = (Boolean) IApgService2.class.getMethod(function, Bundle.class, Bundle.class).invoke(mApgService, pArgs, pReturn);
mErrorList.addAll(pReturn.getStringArrayList(ret.ERRORS.name()));
mWarningList.addAll(pReturn.getStringArrayList(ret.WARNINGS.name()));
return success;
} catch (NoSuchMethodException e) {
Log.e(TAG, "Remote call not known (" + function + "): " + e.getMessage(), e);
mErrorList.add("(LOCAL) Remote call not known (" + function + "): " + e.getMessage());
mResult.putInt(ret.ERROR.name(), error.CALL_NOT_KNOWN.ordinal());
return false;
} catch (InvocationTargetException e) {
Throwable orig = e.getTargetException();
Log.w(TAG, "Exception of type '" + orig.getClass() + "' on AIDL call '" + function + "': " + orig.getMessage(), orig);
mErrorList.add("(LOCAL) Exception of type '" + orig.getClass() + "' on AIDL call '" + function + "': " + orig.getMessage());
return false;
} catch (Exception e) {
Log.e(TAG, "Generic error (" + e.getClass() + "): " + e.getMessage(), e);
mErrorList.add("(LOCAL) Generic error (" + e.getClass() + "): " + e.getMessage());
mResult.putInt(ret.ERROR.name(), error.GENERIC.ordinal());
return false;
}
}
/**
* Set a string argument for APG
*
* <p>
* This defines a string argument for APG's AIDL-interface.
* </p>
*
* <p>
* To know what key-value-pairs are possible (or required), take a look into
* the IApgService.aidl
* </p>
*
* <p>
* Note that parameters are not reseted after a call, so you have to
* reset ({@link #clearArgs()}) them manually if you want to.
* </p>
*
*
* @param key
* the key
* @param val
* the value
*
* @see #clearArgs()
*/
public void setArg(String key, String val) {
mArgs.putString(key, val);
}
/**
* Set a string-array argument for APG
*
* <p>
* If the AIDL-parameter is an {@literal ArrayList<String>}, you have to use
* this function.
* </p>
*
* <code>
* <pre>
* setArg("a key", new String[]{ "entry 1", "entry 2" });
* </pre>
* </code>
*
* @param key
* the key
* @param vals
* the value
*
* @see #setArg(String, String)
*/
public void setArg(String key, String vals[]) {
ArrayList<String> list = new ArrayList<String>();
for (String val : vals) {
list.add(val);
}
mArgs.putStringArrayList(key, list);
}
/**
* Set up a boolean argument for APG
*
* @param key
* the key
* @param vals
* the value
*
* @see #setArg(String, String)
*/
public void setArg(String key, boolean val) {
mArgs.putBoolean(key, val);
}
/**
* Set up a int argument for APG
*
* @param key
* the key
* @param vals
* the value
*
* @see #setArg(String, String)
*/
public void setArg(String key, int val) {
mArgs.putInt(key, val);
}
/**
* Set up a int-array argument for APG
* <p>
* If the AIDL-parameter is an {@literal ArrayList<Integer>}, you have to
* use this function.
* </p>
*
* @param key
* the key
* @param vals
* the value
*
* @see #setArg(String, String)
*/
public void setArg(String key, int vals[]) {
ArrayList<Integer> list = new ArrayList<Integer>();
for (int val : vals) {
list.add(val);
}
mArgs.putIntegerArrayList(key, list);
}
/**
* Set up binary data to en/decrypt
*
* @param is
* InputStream to get the data from
*/
public void setBlob(InputStream is) {
if( LOCAL_LOGD ) Log.d(TAG, "setBlob() called");
// 1. get the new contentUri
ContentResolver cr = mContext.getContentResolver();
Uri contentUri = cr.insert(Uri.parse(BLOB_URI), new ContentValues());
// 2. insert binary data
OutputStream os = null;
try {
os = cr.openOutputStream(contentUri, "w");
} catch( Exception e ) {
Log.e(TAG, "... exception on setBlob", e);
}
byte[] buffer = new byte[8];
int len = 0;
try {
while( (len = is.read(buffer)) != -1) {
os.write(buffer, 0, len);
}
if(LOCAL_LOGD) Log.d(TAG, "... write finished, now closing");
os.close();
} catch (Exception e) {
Log.e(TAG, "... error on writing buffer", e);
}
mArgs.putString("BLOB", contentUri.toString() );
}
/**
* Clears all arguments
*
* <p>
* Anything the has been set up with the various
* {@link #setArg(String, String)} functions is cleared.
* </p>
*
* <p>
* Note that any warning, error, callback, result, etc. is NOT cleared with
* this.
* </p>
*
* @see #reset()
*/
public void clearArgs() {
mArgs.clear();
}
/**
* Return the object associated with the key
*
* @param key
* the object's key you want to return
* @return an object at position key, or null if not set
*/
public Object getArg(String key) {
return mArgs.get(key);
}
/**
* Iterates through the errors
*
* <p>
* With this method you can iterate through all errors. The errors are only
* returned once and deleted immediately afterwards, so you can only return
* each error once.
* </p>
*
* @return a human readable description of a error that happened, or null if
* no more errors
*
* @see #hasNextError()
* @see #clearErrors()
*/
public String getNextError() {
if (mErrorList.size() != 0)
return mErrorList.remove(0);
else
return null;
}
/**
* Check if there are any new errors
*
* @return true, if there are unreturned errors, false otherwise
*
* @see #getNextError()
*/
public boolean hasNextError() {
return mErrorList.size() != 0;
}
/**
* Get the numeric representation of the last error
*
* <p>
* Values <100 mean the error happened locally, values >=100 mean the error
* happened at the remote side (APG). See the IApgService.aidl (or get the
* human readable description with {@link #getNextError()}) for what
* errors >=100 mean.
* </p>
*
* @return the id of the error that happened
*/
public int getError() {
if (mResult.containsKey(ret.ERROR.name()))
return mResult.getInt(ret.ERROR.name());
else
return -1;
}
/**
* Iterates through the warnings
*
* <p>
* With this method you can iterate through all warnings. Warnings are
* only returned once and deleted immediately afterwards, so you can only
* return each warning once.
* </p>
*
* @return a human readable description of a warning that happened, or null
* if no more warnings
*
* @see #hasNextWarning()
* @see #clearWarnings()
*/
public String getNextWarning() {
if (mWarningList.size() != 0)
return mWarningList.remove(0);
else
return null;
}
/**
* Check if there are any new warnings
*
* @return true, if there are unreturned warnings, false otherwise
*
* @see #getNextWarning()
*/
public boolean hasNextWarning() {
return mWarningList.size() != 0;
}
/**
* Get the result
*
* <p>
* This gets your result. After doing an encryption or decryption with APG,
* you get the output with this function.
* </p>
*
* <p>
* Note when your last remote call is unsuccessful, the result will
* still have the same value like the last successful call (or null, if no
* call was successful). To ensure you do not work with old call's results,
* either be sure to {@link #reset()} (or at least {@link #clearResult()})
* your instance before each new call or always check that
* {@link #hasNextError()} is false.
* </p>
*
* <p>
* Note: When handling binary data with {@link #setBlob(InputStream)}, you
* get your result with {@link #getBlobResult()}.
* </p>
*
* @return the mResult of the last {@link #call(String)} or
* {@link #callAsync(String)}.
*
* @see #reset()
* @see #clearResult()
* @see #getResultBundle()
* @see #getBlobResult()
*/
public String getResult() {
return mResult.getString(ret.RESULT.name());
}
/**
* Get the binary result
*
* <p>
* This gets your binary result. It only works if you called {@link #setBlob(InputStream)} before.
*
* If you did not call encrypt nor decrypt, this will be the same data as you inputed.
* </p>
*
* @return InputStream of the binary data which was en/decrypted
*
* @see #setBlob(InputStream)
* @see #getResult()
*/
public InputStream getBlobResult() {
if(mArgs.containsKey("BLOB")) {
ContentResolver cr = mContext.getContentResolver();
InputStream in = null;
try {
in = cr.openInputStream(Uri.parse(mArgs.getString("BLOB")));
} catch( Exception e ) {
Log.e(TAG, "Could not return blob in result", e);
}
return in;
} else {
return null;
}
}
/**
* Get the result bundle
*
* <p>
* Unlike {@link #getResult()}, which only returns any en-/decrypted
* message, this function returns the complete information that was returned
* by Apg. This also includes the "RESULT", but additionally the warnings,
* errors and any other information.
* </p>
* <p>
* For warnings and errors it is suggested to use the functions that are
* provided here, namely {@link #getError()}, {@link #getNextError()},
* {@link #get_next_Warning()} etc.), but if any call returns something non
* standard, you have access to the complete result bundle to extract the
* information.
* </p>
*
* @return the complete result bundle of the last call to apg
*/
public Bundle getResultBundle() {
return mResult;
}
public error getConnectionStatus() {
return mConnectionStatus;
}
/**
* Clears all unfetched errors
*
* @see #getNextError()
* @see #hasNextError()
*/
public void clearErrors() {
mErrorList.clear();
mResult.remove(ret.ERROR.name());
}
/**
* Clears all unfetched warnings
*
* @see #getNextWarning()
* @see #hasNextWarning()
*/
public void clearWarnings() {
mWarningList.clear();
}
/**
* Clears the last mResult
*
* @see #getResult()
*/
public void clearResult() {
mResult.remove(ret.RESULT.name());
}
/**
* Set a callback listener when call to AIDL finishes
*
* @param obj
* a object to call back after async execution
* @see ApgConInterface
*/
public void setOnCallFinishListener(OnCallFinishListener lis) {
mOnCallFinishListener = lis;
}
/**
* Clears any callback object
*
* @see #setOnCallFinishListener(OnCallFinishListener)
*/
public void clearOnCallFinishListener() {
mOnCallFinishListener = null;
}
/**
* Checks if an async execution is running
*
* <p>
* If you started something with {@link #callAsync(String)}, this will
* return true if the task is still running
* </p>
*
* @return true, if an async task is still running, false otherwise
*
* @see #callAsync(String)
*
*/
public boolean isRunning() {
return mAsyncRunning;
}
/**
* Completely resets your instance
*
* <p>
* This currently resets everything in this instance. Errors, warnings,
* results, callbacks, ... are removed. Any connection to the remote
* interface is upheld, though.
* </p>
*
* <p>
* Note when an async execution ({@link #callAsync(String)}) is
* running, it's result, warnings etc. will still be evaluated (which might
* be not what you want). Also mind that any callback you set is also
* reseted, so when finishing the execution any before defined callback will
* NOT BE TRIGGERED.
* </p>
*/
public void reset() {
clearErrors();
clearWarnings();
clearArgs();
clearOnCallFinishListener();
mResult.clear();
}
}
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