feat(bots/discord): support nickname decancering

bots/discord/src/commands/moderation/cure.ts

@@ -0,0 +1,26 @@
+import { SlashCommandBuilder } from 'discord.js'
+
+import type { Command } from '..'
+
+import { config } from '$/context'
+import { cureNickname } from '$/utils/discord/moderation'
+
+export default {
+    data: new SlashCommandBuilder()
+        .setName('cure')
+        .setDescription("Cure a member's nickname")
+        .addUserOption(option => option.setName('member').setRequired(true).setDescription('The member to cure'))
+        .toJSON(),
+
+    memberRequirements: {
+        roles: config.moderation?.roles ?? [],
+    },
+
+    global: false,
+
+    async execute(_, interaction) {
+        const user = interaction.options.getUser('user', true)
+        const member = await interaction.guild!.members.fetch(user.id)
+        await cureNickname(member)
+    },
+} satisfies Command

bots/discord/src/events/discord/cureRequired.ts

@@ -0,0 +1,18 @@
+import { on } from '$/utils/discord/events'
+import { cureNickname } from '$/utils/discord/moderation'
+
+on('guildMemberUpdate', async (_, oldMember, newMember) => {
+    if (newMember.user.bot) return
+    if (oldMember.nickname !== newMember.nickname) await cureNickname(newMember)
+})
+
+on('guildMemberAdd', (_, member) => {
+    if (member.user.bot) return
+    cureNickname(member)
+})
+
+on('messageCreate', async (_, msg) => {
+    if (msg.author.bot) return
+    if (!msg.member) return
+    await cureNickname(msg.member)
+})

bots/discord/src/utils/discord/moderation.ts

@@ -1,5 +1,6 @@
 import { config, logger } from '$/context'
-import type { ChatInputCommandInteraction, EmbedBuilder, Guild, User } from 'discord.js'
+import decancer from 'decancer'
+import type { ChatInputCommandInteraction, EmbedBuilder, Guild, GuildMember, User } from 'discord.js'
 import { applyReferenceToModerationActionEmbed, createModerationActionEmbed } from './embeds'
 
 const PresetLogAction = {
@@ -43,3 +44,16 @@ export const getLogChannel = async (guild: Guild) => {
 
     return
 }
+
+export const cureNickname = async (member: GuildMember) => {
+    if (!member.manageable) throw new Error('Member is not manageable')
+    const name = member.displayName
+    let cured = decancer(name)
+        .toString()
+        .replace(/[^a-zA-Z0-9]/g, '')
+
+    if (!cured || !/^[a-zA-Z]/.test(cured)) cured = config.moderation?.cure?.defaultName ?? 'ReVanced member'
+
+    await member.setNickname(cured, 'Nickname cured')
+    logger.log(`Cured nickname for ${member.user.tag} (${member.id}) from "${name}"`)
+}