process message inits

src/main/java/eu/siacs/conversations/xmpp/jingle/AbstractJingleConnection.java

@@ -72,4 +72,15 @@ public abstract class AbstractJingleConnection {
             return Objects.hashCode(account.getJid(), with, sessionId);
         }
     }
+
+
+    public enum State {
+        NULL, //default value; nothing has been sent or received yet
+        PROPOSED,
+        ACCEPTED,
+        PROCEED,
+        SESSION_INITIALIZED, //equal to 'PENDING'
+        SESSION_ACCEPTED, //equal to 'ACTIVE'
+        TERMINATED //equal to 'ENDED'
+    }
 }

src/main/java/eu/siacs/conversations/xmpp/jingle/JingleRtpConnection.java

@@ -2,13 +2,32 @@ package eu.siacs.conversations.xmpp.jingle;
 
 import android.util.Log;
 
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+
+import java.util.Collection;
+import java.util.Map;
+
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xml.Namespace;
 import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 import rocks.xmpp.addr.Jid;
 
 public class JingleRtpConnection extends AbstractJingleConnection {
 
+    private static final Map<State, Collection<State>> VALID_TRANSITIONS;
+
+    static {
+        final ImmutableMap.Builder<State, Collection<State>> transitionBuilder = new ImmutableMap.Builder<>();
+        transitionBuilder.put(State.NULL, ImmutableList.of(State.PROPOSED, State.SESSION_INITIALIZED));
+        transitionBuilder.put(State.PROPOSED, ImmutableList.of(State.ACCEPTED, State.PROCEED));
+        VALID_TRANSITIONS = transitionBuilder.build();
+    }
+
+    private State state = State.NULL;
+
 
     public JingleRtpConnection(JingleConnectionManager jingleConnectionManager, Id id) {
         super(jingleConnectionManager, id);
@@ -17,9 +36,70 @@ public class JingleRtpConnection extends AbstractJingleConnection {
     @Override
     void deliverPacket(final JinglePacket jinglePacket) {
         Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": packet delivered to JingleRtpConnection");
+        Log.d(Config.LOGTAG, jinglePacket.toString());
     }
 
-    void deliveryMessage(final Jid to, Jid from, Element message) {
+    void deliveryMessage(final Jid to, final Jid from, final Element message) {
         Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": delivered message to JingleRtpConnection " + message);
+        final boolean originatedFromMyself = from.asBareJid().equals(id.account.getJid().asBareJid());
+        switch (message.getName()) {
+            case "propose":
+                if (originatedFromMyself) {
+                    Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": saw proposal from mysql. ignoring");
+                } else if (transition(State.PROPOSED)) {
+                    //TODO start ringing or something
+                    pickUpCall();
+                } else {
+                    Log.d(Config.LOGTAG, id.account.getJid() + ": ignoring session proposal because already in " + state);
+                }
+                break;
+            default:
+                break;
+        }
     }
+
+    public void pickUpCall() {
+        switch (this.state) {
+            case PROPOSED:
+                pickupCallFromProposed();
+                break;
+            case SESSION_INITIALIZED:
+                pickupCallFromSessionInitialized();
+                break;
+            default:
+                throw new IllegalStateException("Can not pick up call from " + this.state);
+        }
+    }
+
+    private void pickupCallFromProposed() {
+        transitionOrThrow(State.PROCEED);
+        final MessagePacket messagePacket = new MessagePacket();
+        messagePacket.setTo(id.with);
+        //Note that Movim needs 'accept'
+        messagePacket.addChild("proceed", Namespace.JINGLE_MESSAGE).setAttribute("id", id.sessionId);
+        Log.d(Config.LOGTAG, messagePacket.toString());
+        xmppConnectionService.sendMessagePacket(id.account, messagePacket);
+    }
+
+    private void pickupCallFromSessionInitialized() {
+
+    }
+
+    private synchronized boolean transition(final State target) {
+        final Collection<State> validTransitions = VALID_TRANSITIONS.get(this.state);
+        if (validTransitions != null && validTransitions.contains(target)) {
+            this.state = target;
+            Log.d(Config.LOGTAG, id.account.getJid().asBareJid() + ": transitioned into " + target);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    private void transitionOrThrow(final State target) {
+        if (!transition(target)) {
+            throw new IllegalStateException(String.format("Unable to transition from %s to %s", this.state, target));
+        }
+    }
+
 }

src/main/java/eu/siacs/conversations/xmpp/jingle/stanzas/JinglePacket.java

@@ -11,6 +11,8 @@ import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
 public class JinglePacket extends IqPacket {
 
+    //TODO add support for groups: https://xmpp.org/extensions/xep-0338.html
+
     private JinglePacket() {
         super();
     }
@@ -30,6 +32,7 @@ public class JinglePacket extends IqPacket {
         return jinglePacket;
     }
 
+    //TODO can have multiple contents
     public Content getJingleContent() {
         final Element content = getJingleChild("content");
         return content == null ? null : Content.upgrade(content);