Add support for user-installable apps

[freya022]

Pull Request Etiquette

• I have checked the PRs for upcoming features/bug fixes.
• I have read the contributing guidelines.

Changes

• Internal code
• Library interface (affecting end-user code)
• Documentation
• Other: _____

Closes Issue: NaN

Description

This adds support for https://discord.com/developers/docs/change-log#userinstallable-apps-preview.

You are able to create application commands using the new properties, read the new data structures provided in ApplicationInfo, Interaction and Message, as well as responding to interactions in detached guilds (where your bot isn't it in) and group DMs.

[Xirado]

Looking quite good

[Ran-Mewo]

There seems to be a caching issue
If two different people use the same command in the same dm then all subsequent event.getUser() will return whoever used the command first.

[freya022]

There seems to be a caching issue If two different people use the same command in the same dm then all subsequent event.getUser() will return whoever used the command first.

Should be fixed

[Ran-Mewo]

I am not sure if this is an issue on my code or the library
but updating attachments with editOriginalAttachments doesn't actually cause it to update unless you restart your discord

it's not an issue on my client as it also occurs for other people

[freya022]

I am not sure if this is an issue on my code or the library but updating attachments with editOriginalAttachments doesn't actually cause it to update unless you restart your discord

it's not an issue on my client as it also occurs for other people

As you mentioned, restarting the client fixes the issue, so it's not a JDA issue

[Ran-Mewo]

I really doubt it's not a JDA issue, it works in other discord frameworks
Replying to an interaction using reply and then editing the original hook's attachments just doesn't work on JDA (well it does but discord doesn't update it)

sigh at this point I just give up, I have to resort to putting my image in an embed (by using .setImage("attachment://" + fileName))
I really hate how images in embeds get scaled down but that's a discord problem

the thing that annoys me the most is that it used to work, I don't know what changed nor do I know if it's something to do with your new changes

[freya022]

Can't repro with the code below, please share minimal reproduction code if you can

public void onSlashReplyEditAttachment(SlashCommandInteractionEvent event, Message.Attachment attachment, Message.Attachment attachment2) throws Exception {
    final byte[] bytes = getBytes(attachment);
    final byte[] bytes2 = getBytes(attachment2);

    event.replyFiles(FileUpload.fromData(bytes, attachment.getFileName()))
            .setEphemeral(true) // Tried without ephemeral too
            .queue();

    event.getHook()
            .editOriginalAttachments(FileUpload.fromData(bytes2, attachment.getFileName()))
            .queue();
}

private byte[] getBytes(Message.Attachment attachment) throws Exception {
    try (InputStream stream = attachment.getProxy().download().get()) {
        return stream.readAllBytes();
    }
}

[ErfinderLabyrinth]

Maybe a UserJoinEvent(like GuildJoinEvent for userapps) and a JDA.getInstalledAppUsers()(like JDA.getGuilds() for userapps)

[freya022]

Maybe a UserJoinEvent(like GuildJoinEvent for userapps) and a JDA.getInstalledAppUsers()(like JDA.getGuilds() for userapps)

Discord doesn't have a way to get who installed the application on their accounts

As a reminder, JDA adds what Discord documents, if it isn't in the Discord docs, we can't add it