Discord commands for custom emojis

createEmojiCommand.js

const emojiNameMatcher = /^[a-z0-9_]+$/

const unsupportedImageFormats = ['image/webp']

const command = async (interaction, client) => {
    let deffered = false

    const reply = async (...args) => {
        if (deffered) {
            await interaction.editReply(...args)
        } else {
            await interaction.reply(...args)
        }
    }

    try {
        const emojiName = interaction.options.get('name', true).value

        if (!emojiNameMatcher.test(emojiName)) {
            return await reply({ content: 'Name can only be letter, number or underscore...' })
        }

        const { attachment } = interaction.options.get('image', true)
        const fit = interaction.options.get('fit', false)?.value || 'cover'

        if (!attachment.url || !attachment.contentType.startsWith('image/')) {
            return await reply({ content: 'Attachment is not an image...' })
        }

        if (unsupportedImageFormats.includes(attachment.contentType)) {
            return await reply({ content: 'webp format is not supported, use png or jpeg...' })
        }

        const emojiImageParams = new URLSearchParams()
        emojiImageParams.append('image', attachment.url)
        emojiImageParams.append('fit', fit)

        await interaction.deferReply({ ephemeral: true, fetchReply: true })
        deffered = true

        interaction.guild.emojis.cache.clear()
        await interaction.guild.emojis.fetch()

        const existingEmoji = interaction.guild.emojis.cache.find(emoji => emoji.name === emojiName)

        if (existingEmoji) {
            return await reply({ content: 'Emoji already exists...' })
        }

        // /discord/emoji is an example, you should adjust this to your own API/route
        const emojiImage = await fetch(`/discord/emoji?${emojiImageParams.toString()}`, {}).then(res =>
            res.arrayBuffer()
        )

        const emoji = await interaction.guild.emojis.create({
            name: emojiName,
            attachment: Buffer.from(emojiImage)
        })

        await reply({ content: `Done! You can use new emoji with :${emoji.name}:` })
    } catch (error) {
        console.error('[interactions][create-emoji error]', error.message)

        reply({ content: 'Something went wrong...' })
    }
}

export default command

removeEmojiCommand.js

const emojiNameMatcher = /^[a-z0-9_]+$/

const command = async (interaction, client) => {
    let deffered = false

    const reply = async (...args) => {
        if (deffered) {
            await interaction.editReply(...args)
        } else {
            await interaction.reply(...args)
        }
    }

    try {
        const emojiName = interaction.options.get('name', true).value

        if (!emojiNameMatcher.test(emojiName)) {
            return await reply({ content: 'Name can only be letter, number or underscore...' })
        }

        await interaction.deferReply({ ephemeral: true, fetchReply: true })
        deffered = true

        interaction.guild.emojis.cache.clear()
        await interaction.guild.emojis.fetch()

        const emoji = interaction.guild.emojis.cache.find(emoji => emoji.name === emojiName)

        if (!emoji) {
            return await reply({ content: 'Emoji does not exist...' })
        }

        await interaction.guild.emojis.delete(emoji.id)

        await reply({ content: `Emoji is removed!` })
    } catch (error) {
        console.error('[interactions][remove-emoji error]', error.message)

        reply({ content: 'Something went wrong...' })
    }
}

export default command