Collection of useful Kotlin extensions for JDA. Great in combination with kotlinx-coroutines and jda-reactor.
- Kotlin 2.0.0
- kotlinx.coroutines 1.8.1
- JDA 5.0.0
You can look at my own bot (strumbot) for inspiration, or look at the examples listed here. The most useful feature of this library is the CoroutineEventManager which adds the ability to use suspending functions in your event handlers.
// enableCoroutines (default true) changes the event manager to CoroutineEventManager
// this event manager uses a default scope generated by getDefaultScope() but can be configured to use a custom scope if you set it manually
val jda = light("token", enableCoroutines=true) {
intents += listOf(GatewayIntent.GUILD_MEMBERS, GatewayIntent.MESSAGE_CONTENT)
}
// This can only be used with the CoroutineEventManager
jda.listener<MessageReceivedEvent> {
val guild = it.guild
val channel = it.channel
val message = it.message
val content = message.contentRaw
if (content.startsWith("!profile")) {
// Send typing indicator and wait for it to arrive
channel.sendTyping().await()
val user = message.mentionedUsers.firstOrNull() ?: run {
// Try loading user through prefix loading
val matches = guild.retrieveMembersByPrefix(content.substringAfter("!profile "), 1).await()
// Take first result, or null
matches.firstOrNull()
}
if (user == null) // unknown user for name
channel.send("${it.author.asMention}, I cannot find a user for your query!").queue()
else // load profile and send it as embed
channel.send("${it.author.asMention}, here is the user profile:", embeds=profile(user).into()).queue()
}
}
jda.onCommand("ban", timeout=2.minutes) { event -> // 2 minute timeout listener
val user = event.getOption<User>("user")!!
val confirm = danger("${user.id}:ban", "Confirm")
event.reply_(
"Are you sure you want to ban **${user.asTag}**?",
components=confirm.into(),
ephemeral=true
).queue()
withTimeoutOrNull(1.minutes) { // 1 minute scoped timeout
val pressed = event.user.awaitButton(confirm) // await for user to click button
pressed.deferEdit().queue() // Acknowledge the button press
event.guild.ban(user, 0).queue() // the button is pressed -> execute action
} ?: event.hook.editMessage(/*id="@original" is default */content="Timed out.", components=emptyList()).queue()
}
jda.onButton("hello") { // Button that says hello
it.reply_("Hello :)").queue()
}I've added a few suspending extension functions to various JDA components.
None of these extensions require the CoroutineEventManager!
To use await<Event> and awaitMessage the event manager must support either EventListener or @SubscribeEvent,
the ReactiveEventManager and CoroutineEventManager both support this.
/* Async Operations */
// Await RestAction result
suspend fun <T> RestAction<T>.await()
// Await Task result (retrieveMembersByPrefix)
suspend fun <T> Task<T>.await()
/* Event Waiter */
// Await specific event
suspend fun <T : GenericEvent> JDA.await(filter: (T) -> Boolean = { true })
// Await specific event
suspend fun <T : GenericEvent> ShardManager.await(filter: (T) -> Boolean = { true })
// Await message from specific channel (filter by user and/or filter function)
suspend fun MessageChannel.awaitMessage(author: User? = null, filter: (Message) -> Boolean = { true }): Message
// Flow representation for PaginationAction
fun <T, M: PaginationAction<T, M>> M.asFlow(): Flow<T>This library implements delegate properties which can be used to safely keep references of JDA entities such as users/channels.
These delegates can be used with the ref() extension function:
class Foo(guild: Guild) {
val guild : Guild by guild.ref()
}You can also use the SLF4J delegate to initialize loggers.
object Listener : ListenerAdapter() {
private val log by SLF4J
override fun onMessageReceived(event: MessageReceivedEvent) {
log.info("[{}] {}: {}", event.channel.name, event.author.asTag, event.message.contentDisplay)
}
}This library also provides some useful builder alternatives which can be used instead of the default MessageBuilder and EmbedBuilder from JDA.
You can see both builders in builders.kt.
Example
val embed = Embed(title="Hello Friend", description="Goodbye Friend")Or the builder function style:
val embed = Embed { // Builds a MessageEmbed
title = "Hello Friend"
description = "Goodbye Friend"
field {
name = "How good is this example?"
value = "5 :star:"
inline = false
}
timestamp = Instant.now()
color = 0xFF0000
}
val message = MessageCreate { // Builds MessageCreateData
embeds += Embed("Ban Confirmation")
components += row(
success(id="approve:ban:$userId", label="Approve"),
danger(id="deny:ban:$userId", label="Deny")
)
}jda.updateCommands {
slash("ban", "Ban a user") {
restrict(guild=true, Permission.BAN_MEMBERS) // guild only and requires ban permission
option<User>("user", "The user to ban", true)
option<String>("reason", "Why to ban this user")
option<Int>("duration", "For how long to ban this user") {
choice("1 day", 1)
choice("1 week", 7)
choice("1 month", 31)
}
}
slash("mod", "Moderation commands") {
restrict(guild=true, Permission.MODERATE_MEMBERS) // you cannot apply this on subcommands due to discord's design!
subcommand("ban", "Ban a user") {
option<User>("user", "The user to ban", true)
option<String>("reason", "Why to ban this user")
option<Int>("duration", "For how long to ban this user") {
choice("1 day", 1)
choice("1 week", 7)
choice("1 month", 31)
}
}
subcommand("prune", "Prune messages") {
option<Int>("amount", "The amount to delete from 2-100, default 50")
}
}
}.queue()
jda.upsertCommand("prune", "Prune messages") {
restrict(guild=true, Permission.MESSAGE_MANAGE) // guild only and requires message manage perms
option<Int>("amount", "The amount to delete from 2-100, default 50")
}.queue()
val menu = StringSelectMenu("menu:class") {
option("Frost Mage", "mage-frost", emoji=FROST_SPEC, default=true)
option("Fire Mage", "mage-fire", emoji=FIRE_SPEC)
option("Arcane Mage", "mage-arcane", emoji=ARCANE_SPEC)
}jda.upsertCommand("ban", "ban a user") {
option<Member>("member", "The member to ban", true)
option<String>("reason", "The ban reason")
}.queue()
jda.onCommand("ban") { event ->
if (event.user.asTag != "Minn#6688") return@onCommand
val guild = event.guild!!
val member = event.getOption<User>("member")!!
val reason = event.getOption<String>("reason")
// Buttons will timeout after 15 minutes by default
val accept = jda.button(label = "Accept", style = SUCCESS, user = event.user) {
guild.ban(member, 0, reason).queue()
it.editMessage("${event.user.asTag} banned ${member.asTag}")
.setActionRows() // remove buttons from message
.queue()
}
val deny = jda.button(label = "Deny", style = DANGER, user = event.user) { butt ->
butt.hook.deleteOriginal().queue() // automatically acknowledged if callback does not do it
}
event.reply_("Are you sure?")
.addActionRow(accept, deny) // send your buttons
.queue()
}
// or a global listener
jda.onButton("accept") { event ->
event.reply("You accepted :)").queue()
}This library also adds some more kotlin idiomatic message send/edit extensions which rely on named parameters.
These named parameters also support defaults, which can be modified by SendDefaults and MessageEditDefaults.
In order to avoid overload conflicts with methods from JDA, some functions may use a suffixed _ such as reply_ or editMessage_.
This is simply done to prevent you from accidentally calling the wrong overload which doesn't use the defaults of this library.
If you don't care about that, you can simply add an import alias with import dev.minn.jda.ktx.message.reply_ as reply.
Example:
SendDefaults.ephemeral = true // <- all reply_ calls set ephemeral=true by default
MessageEditDefaults.replace = false // <- only apply explicitly set parameters (default behavior)
jda.onCommand("ban") { event ->
if (!event.member.hasPermission(Permission.BAN_MEMBERS))
return@onCommand event.reply_("You can't do that!").queue()
event.reply_("Are you sure?", components=danger("ban", "Yes!").into())
val interaction = event.user.awaitButton("ban")
val user = event.getOption<User>("target")!!
event.guild!!.ban(user, 0).queue()
interaction.editMessage_("Successfully banned user", components=emptyList()).queue()
} 
This project is available on maven central.
repositories {
mavenCentral()
}
dependencies {
implementation("net.dv8tion:JDA:${JDA_VERSION}")
implementation("club.minnced:jda-ktx:${VERSION}")
}<dependency>
<groupId>net.dv8tion</groupId>
<artifactId>JDA</artifactId>
<version>$JDA_VERSION</version>
</dependency>
<dependency>
<groupId>club.minnced</groupId>
<artifactId>jda-ktx</artifactId>
<version>$VERSION</version>
</dependency>