utils.js

import 'dotenv/config';
import fetch from 'node-fetch';
import { verifyKey } from 'discord-interactions';

export function VerifyDiscordRequest(clientKey) {
  return function (req, res, buf, encoding) {
    const signature = req.get('X-Signature-Ed25519');
    const timestamp = req.get('X-Signature-Timestamp');

    const isValidRequest = verifyKey(buf, signature, timestamp, clientKey);
    if (!isValidRequest) {
      res.status(401).send('Bad request signature');
      throw new Error('Bad request signature');
    }
  };
}

export async function DiscordRequest(endpoint, options) {
  // append endpoint to root API URL
  const url = 'https://discord.com/api/v10/' + endpoint;
  // Stringify payloads
  if (options.body) options.body = JSON.stringify(options.body);
  // Use node-fetch to make requests
  const res = await fetch(url, {
    headers: {
      Authorization: `Bot ${process.env.DISCORD_TOKEN}`,
      'Content-Type': 'application/json; charset=UTF-8',
      'User-Agent': 'DiscordBot (https://github.com/discord/discord-example-app, 1.0.0)',
    },
    ...options
  });
  // throw API errors
  if (!res.ok) {
    const data = await res.json();
    console.log(res.status);
    throw new Error(JSON.stringify(data));
  }
  // return original response
  return res;
}

export async function InstallGlobalCommands(appId, commands) {
  // API endpoint to overwrite global commands
  const endpoint = `applications/${appId}/commands`;

  try {
    // This is calling the bulk overwrite endpoint: https://discord.com/developers/docs/interactions/application-commands#bulk-overwrite-global-application-commands
    await DiscordRequest(endpoint, { method: 'PUT', body: commands });
  } catch (err) {
    console.error(err);
  }
}

export function name_convert( str ) {
  let regex_hypen = /-/ig;
  let regex_underscore = /_/ig;
  let text = str.replace(regex_hypen, ' - ').replace(regex_underscore, ' ');
  let words = text.split(" ");
  for (let i = 0; i < words.length; i++) {
      words[i] = words[i][0].toUpperCase() + words[i].substr(1);
  }
  return words.join(" ");
}

export function generate_card_embed( card ) {
  return {
      "title": card.name + ( card.subtitle ? ' - ' + card.subtitle : '' ),
      "description": card['body-text']
        + '\n' + ( card['flavor-text'] != undefined ? card['flavor-text'] + '\n' : '' )
        + '\n**Type:** ' + card['type']
        + '\n**Colour:** ' + card['color']
        + '\n**Ink Cost:** ' + card['ink-cost']
        + '\n**Rarity:** ' + card['rarity']
        + '\n**Inkable:** ' + card['inkable']
        + '\n**Lore:** ' + ( card['lore-value'] ? card['lore-value'] : 'None' )
        + '\n**Card Number:** ' + card['card-number']
        + '\n**Strength / Willpower:** ' + ( card['strength'] ? card['strength'] : 'None' ) + ' / ' + ( card['willpower'] ? card['willpower'] : 'None' )
        + '\n**Artist:** ' + card['artist']
        ,
      "image": {
        "url": card['image-urls'].medium
      }
    }
}