commit 5c2800b4804f3bbb04a2d3e4cb9ad787c15f8a12 Author: Hashik Donthineni HashikDonthineni@gmail.com Date: Fri Jun 19 16:45:43 2020 +0530

Randomly generated Sid --- .../torproject/snowflake/MyPersistentService.java | 28 ++++++++----- .../java/org/torproject/snowflake/SIDHelper.java | 47 ++++++++++++++++++++++ .../snowflake/exceptions/EmptySIDException.java | 13 ++++++ 3 files changed, 78 insertions(+), 10 deletions(-)

diff --git a/app/src/main/java/org/torproject/snowflake/MyPersistentService.java b/app/src/main/java/org/torproject/snowflake/MyPersistentService.java index b888700..b3d9649 100644 --- a/app/src/main/java/org/torproject/snowflake/MyPersistentService.java +++ b/app/src/main/java/org/torproject/snowflake/MyPersistentService.java @@ -17,6 +17,7 @@ import androidx.annotation.Nullable; import org.json.JSONException; import org.torproject.snowflake.constants.BrokerConstants; import org.torproject.snowflake.constants.ForegroundServiceConstants; +import org.torproject.snowflake.exceptions.EmptySIDException; import org.torproject.snowflake.interfaces.PeerConnectionObserverCallback; import org.torproject.snowflake.pojo.AnsResponse; import org.torproject.snowflake.pojo.AnswerBody; @@ -58,6 +59,7 @@ public class MyPersistentService extends Service { private CompositeDisposable compositeDisposable; private NotificationManager mNotificationManager; private boolean isConnectionAlive; + private SIDHelper sidHelper;

@Nullable @Override @@ -92,6 +94,7 @@ public class MyPersistentService extends Service {

mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); isConnectionAlive = false; + sidHelper = SIDHelper.getInstance(); compositeDisposable = new CompositeDisposable(); sharedPreferences = getSharedPreferences(getString(R.string.sharedpreference_file), MODE_PRIVATE); //Assigning the shared preferences Notification notification = createPersistentNotification(false, null); @@ -340,7 +343,7 @@ public class MyPersistentService extends Service { Log.d(TAG, "fetchOffer: Fetching offer from broker."); ///Retrofit call final GetOfferService getOfferService = RetroServiceGenerator.createService(GetOfferService.class); - Observable<SDPOfferResponse> offer = getOfferService.getOffer(GlobalApplication.getHeadersMap(), new OfferRequestBody("555")); //TODO:Randomly Generate SID. + Observable<SDPOfferResponse> offer = getOfferService.getOffer(GlobalApplication.getHeadersMap(), new OfferRequestBody(sidHelper.generateSid())); compositeDisposable.add( offer.subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) @@ -391,15 +394,20 @@ public class MyPersistentService extends Service { */ public void sendAnswer(SessionDescription sessionDescription) { Log.d(TAG, "sendAnswer: Sending SDP Answer"); - AnswerBodySDP bodySDP = new AnswerBodySDP(); - bodySDP.setSdp(SDPSerializer.serializeAnswer(sessionDescription)); - AnswerBody body = new AnswerBody("555", bodySDP.toString()); //TODO:Use randomly Generate SID from sendRequest - SendAnswerService service = RetroServiceGenerator.createService(SendAnswerService.class); - Observable<AnsResponse> response = service.sendAnswer(GlobalApplication.getHeadersMap(), body); - compositeDisposable.add( - response.subscribeOn(Schedulers.io()) - .observeOn(AndroidSchedulers.mainThread()).subscribe(this::answerResponseSuccess, this::answerResponseFailure) - ); + try { + AnswerBodySDP bodySDP = new AnswerBodySDP(); + bodySDP.setSdp(SDPSerializer.serializeAnswer(sessionDescription)); + AnswerBody body = new AnswerBody(sidHelper.getSid(), bodySDP.toString()); + SendAnswerService service = RetroServiceGenerator.createService(SendAnswerService.class); + Observable<AnsResponse> response = service.sendAnswer(GlobalApplication.getHeadersMap(), body); + compositeDisposable.add( + response.subscribeOn(Schedulers.io()) + .observeOn(AndroidSchedulers.mainThread()).subscribe(this::answerResponseSuccess, this::answerResponseFailure) + ); + } catch (EmptySIDException e) { + Log.e(TAG, "sendAnswer: getSid() is called before sid generation"); + e.printStackTrace(); + } }

/** diff --git a/app/src/main/java/org/torproject/snowflake/SIDHelper.java b/app/src/main/java/org/torproject/snowflake/SIDHelper.java new file mode 100644 index 0000000..b2040d1 --- /dev/null +++ b/app/src/main/java/org/torproject/snowflake/SIDHelper.java @@ -0,0 +1,47 @@ +package org.torproject.snowflake; + +import org.torproject.snowflake.exceptions.EmptySIDException; + +import java.util.Random; + +/** + * A helper class to handle SID operations. + * There should only be one SID for whole connection cycle hence singleton. + */ +public class SIDHelper { + private static SIDHelper sidHelper; + private String sid; + + private SIDHelper() { + } + + public static SIDHelper getInstance() { + if (sidHelper == null) { + sidHelper = new SIDHelper(); + } + return sidHelper; + } + + /** + * generates a new sid. + * + * @return generated sid. + */ + public String generateSid() { + sid = Integer.toString(new Random().nextInt(10000)); + return sid; + } + + /** + * Returns the generated sid. + * + * @return Existing sid that is generated in "generateSid" method. + * @throws EmptySIDException sid is not generated. + */ + public String getSid() throws EmptySIDException { + if (sid == null) { + throw new EmptySIDException(); + } + return sid; + } +} diff --git a/app/src/main/java/org/torproject/snowflake/exceptions/EmptySIDException.java b/app/src/main/java/org/torproject/snowflake/exceptions/EmptySIDException.java new file mode 100644 index 0000000..f69a366 --- /dev/null +++ b/app/src/main/java/org/torproject/snowflake/exceptions/EmptySIDException.java @@ -0,0 +1,13 @@ +package org.torproject.snowflake.exceptions; + +import androidx.annotation.NonNull; + +public class EmptySIDException extends Exception { + private final String ERROR = "SID is not initialized or generated"; + + @NonNull + @Override + public String toString() { + return ERROR; + } +}