add new group admin functions

Author: nplasterer

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

@@ -12,9 +12,11 @@ import org.xmtp.android.library.messages.DecryptedMessage
 import org.xmtp.android.library.messages.PagingInfoSortDirection
 import org.xmtp.proto.message.api.v1.MessageApiOuterClass
 import uniffi.xmtpv3.FfiGroup
+import uniffi.xmtpv3.FfiGroupMetadata
 import uniffi.xmtpv3.FfiListMessagesOptions
 import uniffi.xmtpv3.FfiMessage
 import uniffi.xmtpv3.FfiMessageCallback
+import uniffi.xmtpv3.GroupPermissions
 import java.lang.Exception
 import java.util.Date
 import kotlin.time.Duration.Companion.nanoseconds
@@ -27,6 +29,9 @@ class Group(val client: Client, private val libXMTPGroup: FfiGroup) {
     val createdAt: Date
         get() = Date(libXMTPGroup.createdAtNs() / 1_000_000)
 
+    private val metadata: FfiGroupMetadata
+        get() = libXMTPGroup.groupMetadata()
+
     fun send(text: String): String {
         return send(prepareMessage(content = text, options = null))
     }
@@ -133,6 +138,18 @@ class Group(val client: Client, private val libXMTPGroup: FfiGroup) {
         return libXMTPGroup.isActive()
     }
 
+    fun permissionLevel(): GroupPermissions {
+        return metadata.policyType()
+    }
+
+    fun isAdmin(): Boolean {
+        return metadata.creatorAccountAddress().lowercase() == client.address.lowercase()
+    }
+
+    fun adminAddress(): String {
+        return metadata.creatorAccountAddress()
+    }
+
     fun addMembers(addresses: List<String>) {
         try {
             runBlocking { libXMTPGroup.addMembers(addresses) }