Delete discord messages from server.

discordScripts.js

const getUserId = async () => {
   return new Promise((resolve, reject) => {
      const iframe = document.createElement('iframe');
      iframe.onload = () => {
         resolve(JSON.parse(iframe.contentWindow.localStorage.getItem('user_id_cache')));
      }
      iframe.src = 'about:blank';
      document.body.appendChild(iframe);
   });
};

const getMessages = async (guild, authorId) => {
   try {
      const response = await fetch(`https://discord.com/api/v9/guilds/${guild}/messages/search?author_id=${authorId}`, {
         "headers": {
            "authorization": AUTH_TOKEN,
         },
      });
      const json = await response.json();
      const messages = json.messages;

      return messages;
   } catch (err) {
      console.error(err);
   }
}

const deleteMessage = async (messageId, channel) => {
   try {
      const response = await fetch(`https://discord.com/api/v9/channels/${channel}/messages/${messageId}`, {
         "headers": {
            "authorization": AUTH_TOKEN,
         },
         "method": "DELETE",
      });
   } catch (err) {
      console.error(err);
   }
}

const deleteMessages = (messages) => {
   return new Promise((resolve, reject) => {
      for (let [index, message] of Object.entries(messages)) {
         setTimeout(async (message) => {
            console.log('Deleting ', message, '...');
            await deleteMessage(message[0].id, message[0].channel_id);
            if (parseInt(index) === messages.length - 1) {
               console.log('Done deleting messages.');
               resolve();
            }
         }, index * 1000, message);
      }
   })
}

const deleteAllMessages = async (userId) => {
   while (true) {
      const messages = await getMessages(SERVER_ID, userId);

      if (messages.length !== 0) {
         await deleteMessages(messages);
      } else {
         console.log('Done deleting ALL messages.');
         return;
      }
   }
}

// Config;
let AUTH_TOKEN = '';
let SERVER_ID = '';

// Main
const myUserId = await getUserId();
await deleteAllMessages(myUserId);