Support for "migrated to supergroup" events

CHANGELOG.md

@@ -1,6 +1,9 @@
 # TelegramBotAPI changelog
 
 ## 0.37.4
+* `Core`:
+    * New `SupergroupEvent` subtype: `MigratedToSupergroup`. This event is sent when a group is converted to a supergroup while bot is in the group.
+    * Helper extenstion functions on `ChatEvent` to cast it to `MigratedToSupergroup`.
 
 ## 0.37.3 Hotfix of 0.37.3
 

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/GroupChatCreated.kt

@@ -1,8 +1,8 @@
 package dev.inmo.tgbotapi.types.message.ChatEvents
 
-import dev.inmo.tgbotapi.types.ChatIdentifier
+import dev.inmo.tgbotapi.types.ChatId
 import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.GroupEvent
 
 class GroupChatCreated(
-    val migratedTo: ChatIdentifier?
+    val migratedTo: ChatId?
 ): GroupEvent

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroup.kt

@@ -0,0 +1,11 @@
+package dev.inmo.tgbotapi.types.message.ChatEvents
+
+import dev.inmo.tgbotapi.types.ChatId
+import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.SupergroupEvent
+
+/**
+ * This event is sent when a group is converted to a supergroup.
+ */
+class MigratedToSupergroup(
+    val migratedFrom: ChatId
+): SupergroupEvent

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/SupergroupChatCreated.kt

@@ -1,8 +1,8 @@
 package dev.inmo.tgbotapi.types.message.ChatEvents
 
-import dev.inmo.tgbotapi.types.ChatIdentifier
+import dev.inmo.tgbotapi.types.ChatId
 import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.SupergroupEvent
 
 class SupergroupChatCreated(
-    val migratedFrom: ChatIdentifier?
+    val migratedFrom: ChatId?
 ): SupergroupEvent

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/RawMessage.kt

@@ -75,8 +75,8 @@ internal data class RawMessage(
     private val group_chat_created: Boolean = false,
     private val supergroup_chat_created: Boolean = false,
     private val channel_chat_created: Boolean = false,
-    private val migrate_to_chat_id: ChatIdentifier? = null,
-    private val migrate_from_chat_id: ChatIdentifier? = null,
+    private val migrate_to_chat_id: ChatId? = null,
+    private val migrate_from_chat_id: ChatId? = null,
     private val pinned_message: RawMessage? = null,
     private val invoice: Invoice? = null,
     private val dice: Dice? = null,
@@ -194,6 +194,9 @@ internal data class RawMessage(
             supergroup_chat_created -> SupergroupChatCreated(
                 migrate_from_chat_id
             )
+            migrate_from_chat_id != null -> MigratedToSupergroup(
+                migrate_from_chat_id
+            )
             channel_chat_created -> ChannelChatCreated()
             pinned_message != null -> PinnedMessage(pinned_message.asMessage)
             proximity_alert_triggered != null -> proximity_alert_triggered

tgbotapi.core/src/commonTest/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MigratedToSupergroupTest.kt

@@ -0,0 +1,52 @@
+package dev.inmo.tgbotapi.types.message.ChatEvents
+
+import dev.inmo.tgbotapi.TestsJsonFormat
+import dev.inmo.tgbotapi.extensions.utils.asMessageUpdate
+import dev.inmo.tgbotapi.extensions.utils.asMigratedToSupergroup
+import dev.inmo.tgbotapi.extensions.utils.asSupergroupChatCreated
+import dev.inmo.tgbotapi.extensions.utils.asSupergroupEventMessage
+import dev.inmo.tgbotapi.types.ChatId
+import dev.inmo.tgbotapi.types.update.abstracts.UpdateDeserializationStrategy
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertIs
+import kotlin.test.fail
+
+
+class MigratedToSupergroupTest {
+    @Test
+    fun `MigratedToSupergroup event should be parsed`() {
+        val payload = """
+            {
+              "update_id": 42,
+              "message": {
+                "message_id": 1,
+                "from": {
+                  "id": 1087968824,
+                  "is_bot": true,
+                  "first_name": "Group",
+                  "username": "GroupAnonymousBot"
+                },
+                "sender_chat": {
+                  "id": 42,
+                  "title": "MigratedToSupergroupTest",
+                  "type": "supergroup"
+                },
+                "chat": {
+                  "id": 42,
+                  "title": "MigratedToSupergroupTest",
+                  "type": "supergroup"
+                },
+                "date": 1639955462,
+                "migrate_from_chat_id": 57005
+              }
+            }
+        """.trimIndent()
+        val update = TestsJsonFormat.decodeFromString(UpdateDeserializationStrategy, payload)
+        val message = update.asMessageUpdate() ?: fail("update should be of MessageUpdate subtype")
+        val data = message.data.asSupergroupEventMessage() ?: fail("message should be of SupergroupEventMessage subtype")
+        val event = data.chatEvent.asMigratedToSupergroup() ?: fail("event should be of SupergroupChatCreated subtype")
+
+        assertEquals(ChatId(57005), event.migratedFrom)
+    }
+}

tgbotapi.utils/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/utils/ClassCasts.kt

@@ -3081,6 +3081,15 @@ inline fun ChatEvent.asSupergroupChatCreated(): SupergroupChatCreated? = this as
 @PreviewFeature
 inline fun ChatEvent.requireSupergroupChatCreated(): SupergroupChatCreated = this as SupergroupChatCreated
 
+@PreviewFeature
+inline fun <T> ChatEvent.whenMigratedToSupergroup(block: (MigratedToSupergroup) -> T) = asMigratedToSupergroup() ?.let(block)
+
+@PreviewFeature
+inline fun ChatEvent.asMigratedToSupergroup(): MigratedToSupergroup? = this as? MigratedToSupergroup
+
+@PreviewFeature
+inline fun ChatEvent.requireMigratedToSupergroup(): MigratedToSupergroup = this as MigratedToSupergroup
+
 @PreviewFeature
 inline fun <T> ChatEvent.whenChannelEvent(block: (ChannelEvent) -> T) = asChannelEvent() ?.let(block)