Updating topic validation (#141)

- Applying the same approach as iOS for the validation of topics

Co-authored-by: Naomi Plasterer <naomi@xmtp.com>

Author: giovasdistillery

library/src/androidTest/java/org/xmtp/android/library/ConversationTest.kt

@@ -824,18 +824,15 @@ class ConversationTest {
         val directMessageV1 = Topic.directMessageV1(validId, "sd").description
         val directMessageV2 = Topic.directMessageV2(validId).description
         val preferenceList = Topic.preferenceList(validId).description
-        val conversations = bobClient.conversations
 
         // check if validation of topics accepts all types
-        assertTrue(
-            conversations.isValidTopic(privateStore) &&
-                conversations.isValidTopic(contact) &&
-                conversations.isValidTopic(userIntro) &&
-                conversations.isValidTopic(userInvite) &&
-                conversations.isValidTopic(directMessageV1) &&
-                conversations.isValidTopic(directMessageV2) &&
-                conversations.isValidTopic(preferenceList),
-        )
+        assertTrue(Topic.isValidTopic(privateStore))
+        assertTrue(Topic.isValidTopic(contact))
+        assertTrue(Topic.isValidTopic(userIntro))
+        assertTrue(Topic.isValidTopic(userInvite))
+        assertTrue(Topic.isValidTopic(directMessageV1))
+        assertTrue(Topic.isValidTopic(directMessageV2))
+        assertTrue(Topic.isValidTopic(preferenceList))
     }
 
     @Test
@@ -852,15 +849,13 @@ class ConversationTest {
         val preferenceList = Topic.preferenceList(invalidId).description
         val conversations = bobClient.conversations
 
-        // check if validation of topics accepts all types
-        assertFalse(
-            conversations.isValidTopic(privateStore) &&
-                conversations.isValidTopic(contact) &&
-                conversations.isValidTopic(userIntro) &&
-                conversations.isValidTopic(userInvite) &&
-                conversations.isValidTopic(directMessageV1) &&
-                conversations.isValidTopic(directMessageV2) &&
-                conversations.isValidTopic(preferenceList),
-        )
+        // check if validation of topics no accept all types with invalid topic
+        assertFalse(Topic.isValidTopic(privateStore))
+        assertFalse(Topic.isValidTopic(contact))
+        assertFalse(Topic.isValidTopic(userIntro))
+        assertFalse(Topic.isValidTopic(userInvite))
+        assertFalse(Topic.isValidTopic(directMessageV1))
+        assertFalse(Topic.isValidTopic(directMessageV2))
+        assertFalse(Topic.isValidTopic(preferenceList))
     }
 }

library/src/main/java/org/xmtp/android/library/Conversations.kt

@@ -177,23 +177,13 @@ data class Conversations(
         }
 
         conversationsByTopic += newConversations.filter {
-            it.peerAddress != client.address && isValidTopic(it.topic)
+            it.peerAddress != client.address && Topic.isValidTopic(it.topic)
         }.map { Pair(it.topic, it) }
 
         // TODO(perf): use DB to persist + sort
         return conversationsByTopic.values.sortedByDescending { it.createdAt }
     }
 
-    fun isValidTopic(topic: String): Boolean {
-        val regex = Regex("^[\\x00-\\x7F]+$")
-        val index = topic.indexOf("0/")
-        if (index != -1) {
-            val unwrappedTopic = topic.substring(index + 2, topic.lastIndexOf("/proto"))
-            return unwrappedTopic.matches(regex)
-        }
-        return false
-    }
-
     fun importTopicData(data: TopicData): Conversation {
         val conversation: Conversation
         if (!data.hasInvitation()) {

library/src/main/java/org/xmtp/android/library/messages/Topic.kt

@@ -21,10 +21,23 @@ sealed class Topic {
                     addresses.sort()
                     wrap("dm-${addresses.joinToString(separator = "-")}")
                 }
+
                 is directMessageV2 -> wrap("m-$addresses")
                 is preferenceList -> wrap("pppp-$identifier")
             }
         }
 
     private fun wrap(value: String): String = "/xmtp/0/$value/proto"
+
+    companion object {
+        fun isValidTopic(topic: String): Boolean {
+            val regex = Regex("^[\\x00-\\x7F]+$") // Use this regex to filter non ASCII chars
+            val index = topic.indexOf("0/")
+            if (index != -1) {
+                val unwrappedTopic = topic.substring(index + 2, topic.lastIndexOf("/proto"))
+                return unwrappedTopic.matches(regex)
+            }
+            return false
+        }
+    }
 }