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/*
Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Spacebar and Spacebar Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* eslint-disable @typescript-eslint/no-explicit-any */
import { route } from "@spacebar/api";
import { Guild } from "@spacebar/util";
import { Request, Response, Router } from "express";
import fs from "fs";
import { HTTPError } from "lambert-server";
import path from "path";
const router: Router = Router();
// TODO: use svg templates instead of node-canvas for improved performance and to change it easily
// https://discord.com/developers/docs/resources/guild#get-guild-widget-image
// TODO: Cache the response
router.get(
"/",
route({
responses: {
200: {},
400: {
body: "APIErrorResponse",
},
404: {
body: "APIErrorResponse",
},
},
}),
async (req: Request, res: Response) => {
const { guild_id } = req.params;
const guild = await Guild.findOneOrFail({ where: { id: guild_id } });
if (!guild.widget_enabled) throw new HTTPError("Unknown Guild", 404);
// Fetch guild information
const icon = guild.icon;
const name = guild.name;
const presence = guild.presence_count + " ONLINE";
// Fetch parameter
const style = req.query.style?.toString() || "shield";
if (!["shield", "banner1", "banner2", "banner3", "banner4"].includes(style)) {
throw new HTTPError("Value must be one of ('shield', 'banner1', 'banner2', 'banner3', 'banner4').", 400);
}
// Setup canvas
const { createCanvas } = require("canvas");
const { loadImage } = require("canvas");
const sizeOf = require("image-size");
// TODO: Widget style templates need Spacebar branding
const source = path.join(__dirname, "..", "..", "..", "..", "..", "assets", "widget", `${style}.png`);
if (!fs.existsSync(source)) {
throw new HTTPError("Widget template does not exist.", 400);
}
// Create base template image for parameter
const { width, height } = await sizeOf(source);
const canvas = createCanvas(width, height);
const ctx = canvas.getContext("2d");
const template = await loadImage(source);
ctx.drawImage(template, 0, 0);
// Add the guild specific information to the template asset image
switch (style) {
case "shield":
ctx.textAlign = "center";
await drawText(ctx, 73, 13, "#FFFFFF", "thin 10px Verdana", presence);
break;
case "banner1":
if (icon) await drawIcon(ctx, 20, 27, 50, icon);
await drawText(ctx, 83, 51, "#FFFFFF", "12px Verdana", name, 22);
await drawText(ctx, 83, 66, "#C9D2F0FF", "thin 11px Verdana", presence);
break;
case "banner2":
if (icon) await drawIcon(ctx, 13, 19, 36, icon);
await drawText(ctx, 62, 34, "#FFFFFF", "12px Verdana", name, 15);
await drawText(ctx, 62, 49, "#C9D2F0FF", "thin 11px Verdana", presence);
break;
case "banner3":
if (icon) await drawIcon(ctx, 20, 20, 50, icon);
await drawText(ctx, 83, 44, "#FFFFFF", "12px Verdana", name, 27);
await drawText(ctx, 83, 58, "#C9D2F0FF", "thin 11px Verdana", presence);
break;
case "banner4":
if (icon) await drawIcon(ctx, 21, 136, 50, icon);
await drawText(ctx, 84, 156, "#FFFFFF", "13px Verdana", name, 27);
await drawText(ctx, 84, 171, "#C9D2F0FF", "thin 12px Verdana", presence);
break;
default:
throw new HTTPError(
"Value must be one of ('shield', 'banner1', 'banner2', 'banner3', 'banner4').",
400
);
}
// Return final image
const buffer = canvas.toBuffer("image/png");
res.set("Content-Type", "image/png");
res.set("Cache-Control", "public, max-age=3600");
return res.send(buffer);
}
);
async function drawIcon(canvas: any, x: number, y: number, scale: number, icon: string) {
const img = new (require("canvas").Image)();
img.src = icon;
// Do some canvas clipping magic!
canvas.save();
canvas.beginPath();
const r = scale / 2; // use scale to determine radius
canvas.arc(x + r, y + r, r, 0, 2 * Math.PI, false); // start circle at x, and y coords + radius to find center
canvas.clip();
canvas.drawImage(img, x, y, scale, scale);
canvas.restore();
}
async function drawText(
canvas: any,
x: number,
y: number,
color: string,
font: string,
text: string,
maxcharacters?: number
) {
canvas.fillStyle = color;
canvas.font = font;
if (text.length > (maxcharacters || 0) && maxcharacters) text = text.slice(0, maxcharacters) + "...";
canvas.fillText(text, x, y);
}
export default router;
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