implement destination from address

libsession/src/main/java/org/session/libsession/messaging/messages/Destination.kt

@@ -1,5 +1,9 @@
 package org.session.libsession.messaging.messages
 
+import org.session.libsession.messaging.MessagingConfiguration
+import org.session.libsession.messaging.threads.Address
+import org.session.libsession.utilities.GroupUtil
+
 sealed class Destination {
 
     class Contact(val publicKey: String) : Destination()
@@ -7,9 +11,19 @@ sealed class Destination {
     class OpenGroup(val channel: Long, val server: String) : Destination()
 
     companion object {
-        //TODO need to implement the equivalent to TSThread and then implement from(...)
-        fun from(threadID: String): Destination {
-            return Contact(threadID) // Fake for dev
+        fun from(address: Address): Destination {
+            if (address.isContact) {
+                return Contact(address.contactIdentifier())
+            } else if (address.isClosedGroup) {
+                val groupID = address.contactIdentifier().toByteArray()
+                val groupPublicKey = GroupUtil.getDecodedGroupID(groupID)
+                return ClosedGroup(groupPublicKey)
+            } else if (address.isOpenGroup) {
+                val openGroup = MessagingConfiguration.shared.storage.getOpenGroup(address.contactIdentifier())!!
+                return OpenGroup(openGroup.channel, openGroup.server)
+            } else {
+                throw Exception("TODO: Handle legacy closed groups.")
+            }
         }
     }
 }