discordArchiver.js

var authToken;
var archive = {};
let delay = 100;

function processMentions(message) {
	for (mention of message.mentions) message.content = message.content.replace(RegExp("<@!?" + mention['id'] + ">"), mention.username);
}

function renderIRC(messages) {
	var array = [];
	for (message of messages) {
		processMentions(message);
		array.push(`[${message.timestamp}] ${message.author.username}: ${message.content} ${message.attachments.map(x => x.url).join(" ")}`);
	}
	return array.join("\n")
}

function renderHTML(messages) {
	function renderMessageHTML(message) {
		var messageDiv = document.createElement("div");
		var avatar = document.createElement("div");
		var username = document.createElement("strong");
		messageDiv.appendChild(avatar);
		messageDiv.appendChild(username);
		messageDiv.style.marginLeft = "20px";
		messageDiv.style.marginRight = "6px";
		avatar.classList.add("avatar");
		avatar.style.width = avatar.style.height = "40px";
		avatar.style.backgroundSize = "40px 40px"
		avatar.style.marginTop = "-2px";
		avatar.style.marginRight = "20px";
		avatar.style.borderRadius = "50%";
		if (message.author.avatar != undefined) {
			avatar.style.backgroundImage = `url("https://cdn.discordapp.com/avatars/${message.author.id}/${message.author.avatar}.webp?size=128"`
			if (message.author.avatar.startsWith("a_")) {
				avatar.setAttribute("onmouseover", `this.style.backgroundImage = 'url("https://cdn.discordapp.com/avatars/${message.author.id}/${message.author.avatar}.gif?size=128")'`);
				avatar.setAttribute("onmouseout", `this.style.backgroundImage = 'url("https://cdn.discordapp.com/avatars/${message.author.id}/${message.author.avatar}.webp?size=128")'`);
			}
		} else {
			avatar.style.backgroundImage = 'url("https://discordapp.com/assets/0e291f67c9274a1abdddeb3fd919cbaa.png")';
		}
		username.style.color = "white";
		username.classList.add("username");
		username.innerHTML = `${message.author.username}<sub>#${message.author.discriminator}</sub>`;
	}
	var wrapper = document.createElement("div");
	wrapper.style.backgroundColor = "#36393e";
	var template = initMessageTemplate();
	for (message of messages) {
		processMentions(message);
		wrapper.appendChild(renderMessageHTML(message));
	}
}

function archiveMessages(channel, before, after) {
	if (archive[channel] == undefined) archive[channel] = [];
	fetch(`https://discordapp.com/api/channels/${channel}/messages?before=${before}&limit=100`, {headers: {"Authorization": authToken}})
		.then(resp => resp.json())
		.then(messages => {
		var end = false;
		if (messages.length != 0) {
			before = messages[messages.length - 1].id;
		} else {
			end = true      
		}
		for (message of messages) {
			if (message.id == after) {
				end = true;
			} else {
				archive[channel].unshift(message);
			}
		}
		return end;
	}).then((end) => {if (!end) {
		setTimeout(archiveMessages, delay, channel, before, after)
	} else {
		console.log("Done!")
	}});
}