Message interaction

common/src/main/kotlin/entity/DiscordMessage.kt

@@ -1,5 +1,6 @@
 package dev.kord.common.entity
 
+import dev.kord.common.annotation.KordPreview
 import dev.kord.common.entity.optional.Optional
 import dev.kord.common.entity.optional.OptionalBoolean
 import dev.kord.common.entity.optional.OptionalInt
@@ -99,6 +100,7 @@ data class DiscordMessage(
     val stickers: Optional<List<DiscordMessageSticker>> = Optional.Missing(),
     @SerialName("referenced_message")
     val referencedMessage: Optional<DiscordMessage?> = Optional.Missing(),
+    val interaction: Optional<DiscordMessageInteraction> = Optional.Missing()
 )
 
 /**
@@ -239,6 +241,7 @@ data class DiscordPartialMessage(
     val stickers: Optional<List<DiscordMessageSticker>> = Optional.Missing(),
     @SerialName("referenced_message")
     val referencedMessage: Optional<DiscordMessage?> = Optional.Missing(),
+    val interaction: Optional<DiscordMessageInteraction> = Optional.Missing(),
 )
 
 @Serializable
@@ -789,3 +792,12 @@ data class AllowedMentions(
     @SerialName("replied_user")
     val repliedUser: OptionalBoolean = OptionalBoolean.Missing
 )
+
+@KordPreview
+@Serializable
+data class DiscordMessageInteraction(
+    val id: Snowflake,
+    val type: InteractionType,
+    val name: String,
+    val user: DiscordUser
+)

core/src/main/kotlin/cache/data/MessageData.kt

@@ -1,5 +1,6 @@
 package dev.kord.core.cache.data
 
+import cache.data.MessageInteractionData
 import dev.kord.cache.api.data.description
 import dev.kord.common.entity.*
 import dev.kord.common.entity.optional.*
@@ -34,6 +35,7 @@ data class MessageData(
     val flags: Optional<MessageFlags> = Optional.Missing(),
     val stickers: Optional<List<MessageStickerData>> = Optional.Missing(),
     val referencedMessage: Optional<MessageData?> = Optional.Missing(),
+    val interaction: Optional<MessageInteractionData> = Optional.Missing()
 ) {
 
     fun plus(selfId: Snowflake, reaction: MessageReactionAddData): MessageData {
@@ -69,6 +71,9 @@ data class MessageData(
             partialMessage.mentionedChannels.mapList { it.id }.switchOnMissing(mentionedChannels.value.orEmpty())
                 .coerceToMissing()
         val stickers = partialMessage.stickers.mapList { MessageStickerData.from(it) }.switchOnMissing(this.stickers)
+        val referencedMessage = partialMessage.referencedMessage.mapNullable { it?.toData() ?: referencedMessage.value }
+        val interaction =
+            partialMessage.interaction.map { MessageInteractionData.from(it) }.switchOnMissing(interaction)
 
         return MessageData(
             id,
@@ -95,6 +100,8 @@ data class MessageData(
             messageReference,
             flags,
             stickers = stickers,
+            referencedMessage = referencedMessage,
+            interaction = interaction
         )
     }
 
@@ -127,7 +134,8 @@ data class MessageData(
                 messageReference.map { MessageReferenceData.from(it) },
                 flags,
                 stickers.mapList { MessageStickerData.from(it) },
-                referencedMessage.mapNotNull { from(it) }
+                referencedMessage.mapNotNull { from(it) },
+                interaction.map { MessageInteractionData.from(it) }
             )
         }
     }

core/src/main/kotlin/cache/data/MessageInteractionData.kt

@@ -0,0 +1,24 @@
+package cache.data;
+
+import dev.kord.common.annotation.KordPreview
+import dev.kord.common.entity.DiscordMessageInteraction
+import dev.kord.common.entity.InteractionType
+import dev.kord.common.entity.Snowflake
+import dev.kord.core.cache.data.UserData
+import dev.kord.core.cache.data.toData
+import kotlinx.serialization.Serializable
+
+@KordPreview
+@Serializable
+data class MessageInteractionData(
+    val id:Snowflake,
+    val type:InteractionType,
+    val name:String,
+    val user: Snowflake
+) {
+    companion object {
+        fun from(entity: DiscordMessageInteraction): MessageInteractionData = with(entity) {
+            MessageInteractionData(id, type, name, user.id)
+        }
+    }
+}

core/src/main/kotlin/entity/Message.kt

@@ -1,7 +1,10 @@
 package dev.kord.core.entity
 
+import dev.kord.common.annotation.KordPreview
 import dev.kord.common.entity.MessageType
 import dev.kord.common.entity.Snowflake
+import dev.kord.common.entity.optional.map
+import dev.kord.common.entity.optional.mapNullable
 import dev.kord.common.entity.optional.orEmpty
 import dev.kord.common.exception.RequestException
 import dev.kord.core.Kord
@@ -13,6 +16,7 @@ import dev.kord.core.entity.channel.Channel
 import dev.kord.core.entity.channel.GuildChannel
 import dev.kord.core.entity.channel.GuildMessageChannel
 import dev.kord.core.entity.channel.MessageChannel
+import dev.kord.core.entity.interaction.MessageInteraction
 import dev.kord.core.exception.EntityNotFoundException
 import dev.kord.core.supplier.EntitySupplier
 import dev.kord.core.supplier.EntitySupplyStrategy
@@ -174,6 +178,12 @@ class Message(
      */
     val mentionedUserBehaviors: Set<UserBehavior> get() = data.mentions.map { UserBehavior(it, kord) }.toSet()
 
+    /**
+     * The [MessageInteraction] sent on this message object when it is a response to an [dev.kord.core.entity.interaction.Interaction].
+     */
+    @KordPreview
+    val interaction: MessageInteraction? get() = data.interaction.mapNullable { MessageInteraction(it, kord) }.value
+
     /**
      * The [users][User] mentioned in this message.
      *

core/src/main/kotlin/entity/interaction/MessageInteraction.kt

@@ -0,0 +1,67 @@
+package dev.kord.core.entity.interaction
+
+import cache.data.MessageInteractionData
+import dev.kord.common.annotation.KordPreview
+import dev.kord.common.entity.InteractionType
+import dev.kord.common.entity.Snowflake
+import dev.kord.common.exception.RequestException
+import dev.kord.core.Kord
+import dev.kord.core.behavior.UserBehavior
+import dev.kord.core.entity.KordEntity
+import dev.kord.core.entity.Message
+import dev.kord.core.entity.Strategizable
+import dev.kord.core.entity.User
+import dev.kord.core.exception.EntityNotFoundException
+import dev.kord.core.supplier.EntitySupplier
+import dev.kord.core.supplier.EntitySupplyStrategy
+
+/**
+ * An instance of [MessageInteraction](https://discord.com/developers/docs/interactions/slash-commands#messageinteraction)
+ * This is sent on the [Message] object when the message is a response to an [Interaction].
+ */
+@KordPreview
+class MessageInteraction(
+    val data: MessageInteractionData,
+    override val kord: Kord,
+    override val supplier: EntitySupplier = kord.defaultSupplier
+) : KordEntity, Strategizable {
+    /**
+     * [id][Interaction.id] of the [Interaction] this message is responding to.
+     */
+    override val id: Snowflake get() = data.id
+
+    /**
+     * 	the [name][ApplicationCommand.name] of the [ApplicationCommand] that triggered this message.
+     */
+    val name: String get() = data.name
+
+    /**
+     * The [UserBehavior] of the [user][Interaction.user] who invoked the [Interaction]
+     */
+    val user: UserBehavior get() = UserBehavior(data.id, kord)
+
+    /**
+     * the [InteractionType] of the interaction [MessageInteraction].
+     */
+    val type: InteractionType get() = data.type
+
+    /**
+     * Requests the [User] of this interaction message.
+     *
+     * @throws RequestException if something went wrong while retrieving the user.
+     * @throws EntityNotFoundException if the user was null.
+     */
+    suspend fun getUser(): User = supplier.getUser(user.id)
+
+    /**
+     * Requests to get the user of this interaction message,
+     * returns null if the [User] isn't present.
+     *
+     * @throws [RequestException] if anything went wrong during the request.
+     */
+    suspend fun getUserOrNull(): User? = supplier.getUserOrNull(user.id)
+
+    override fun withStrategy(strategy: EntitySupplyStrategy<*>): Strategizable {
+        return MessageInteraction(data, kord, strategy.supply(kord))
+    }
+}

core/src/main/kotlin/gateway/handler/MessageEventHandler.kt

@@ -1,5 +1,6 @@
 package dev.kord.core.gateway.handler
 
+import cache.data.MessageInteractionData
 import dev.kord.cache.api.DataCache
 import dev.kord.cache.api.put
 import dev.kord.cache.api.query
@@ -10,6 +11,7 @@ import dev.kord.core.cache.idEq
 import dev.kord.core.entity.Member
 import dev.kord.core.entity.Message
 import dev.kord.core.entity.ReactionEmoji
+import dev.kord.core.entity.interaction.MessageInteraction
 import dev.kord.core.event.message.*
 import dev.kord.core.gateway.MasterGateway
 import dev.kord.gateway.*
@@ -59,6 +61,12 @@ internal class MessageEventHandler(
             Member(memberData, userData, kord)
         } else null
 
+        //cache interaction user if present.
+        if(interaction is Optional.Value) {
+            val userData = UserData.from(interaction.value!!.user)
+            cache.put(userData)
+        }
+
         mentions.forEach {
             val user = UserData.from(it)
             cache.put(user)