Zaimki/server/routes/banner.js

import { Router } from 'express';
import SQL from 'sql-template-strings';
import {createCanvas, loadImage, registerFont} from "canvas";
import { loadSuml } from '../loader';
import avatar from '../avatar';
import {buildPronoun, parsePronouns} from "../../src/buildPronoun";
import {loadTsv} from "../../src/tsv";
import {handleErrorAsync} from "../../src/helpers";
import cache from "../../src/cache";
import fs from "fs";

const translations = loadSuml('translations');

const drawCircle = (context, image, x, y, size) => {
    context.save();
    context.beginPath();
    context.arc(x + size / 2, y + size / 2, size / 2, 0, Math.PI * 2, true);
    context.closePath();
    context.clip();

    context.drawImage(image, x, y, size, size)

    context.beginPath();
    context.arc(x, y, size / 2, 0, Math.PI * 2, true);
    context.clip();
    context.closePath();
    context.restore();
}

const router = Router();

router.get('/banner/:pronounName*.png', handleErrorAsync(async (req, res) => {
    const width = 1200
    const height = 600
    const mime = 'image/png';
    const imageSize = 200;
    let leftRatio = 4;

    const pronounName = req.params.pronounName + req.params[0];

    const result = await cache('banner', `${pronounName}.png`, 24 * 60, async () => {
        registerFont('static/fonts/quicksand-v21-latin-ext_latin-regular.ttf', {family: 'Quicksand', weight: 'regular'});
        registerFont('static/fonts/quicksand-v21-latin-ext_latin-700.ttf', {family: 'Quicksand', weight: 'bold'});

        const canvas = createCanvas(width, height)
        const context = canvas.getContext('2d')

        const bg = await loadImage('static/bg.png');
        context.drawImage(bg, 0, 0, width, height);

        const fallback = async _ => {
            const logo = await loadImage('node_modules/@fortawesome/fontawesome-pro/svgs/light/tags.svg');
            leftRatio = 5;
            context.drawImage(logo, width / leftRatio - imageSize / 2, height / 2 - imageSize / 1.25 / 2, imageSize, imageSize / 1.25);
            context.font = `regular ${translations.title.length < 10 ? 120 : translations.title.length < 14 ? 80 : 72}pt Quicksand`;
            context.fillText(translations.title, width / leftRatio + imageSize / 1.5, height / 2 + (translations.title.length < 10 ? 48 : translations.title.length < 14 ? 24 : 24));
        }

        if (pronounName.startsWith('@')) {
            const user = await req.db.get(SQL`SELECT id, username, email, avatarSource FROM users WHERE username=${pronounName.substring(1)}`);
            if (!user) {
                await fallback();
                return canvas.toBuffer(mime);
            }

            const avatarImage = await loadImage(await avatar(req.db, user));

            drawCircle(context, avatarImage, width / leftRatio - imageSize / 2, height / 2 - imageSize / 2, imageSize);

            context.font = `regular 48pt Quicksand`
            context.fillText('@' + user.username, width / leftRatio + imageSize, height / 2)

            const logo = await loadImage('static/favicon.svg');

            context.font = 'regular 24pt Quicksand'
            context.fillStyle = '#C71585';
            const logoSize = 24 * 1.25;
            context.drawImage(logo, width / leftRatio + imageSize, height / 2 + logoSize - 4, logoSize, logoSize / 1.25)
            context.fillText(translations.title, width / leftRatio + imageSize + 36, height / 2 + 48);

            return canvas.toBuffer(mime);
        }

        const pronoun = buildPronoun(
            parsePronouns(loadTsv(__dirname + '/../../data/pronouns/pronouns.tsv')),
            pronounName,
        );

        const logo = await loadImage('node_modules/@fortawesome/fontawesome-pro/svgs/light/tags.svg');

        if (!pronoun && pronounName !== global.config.pronouns.any) {
            await fallback();
            return canvas.toBuffer(mime);
        }

        context.drawImage(logo, width / leftRatio - imageSize / 2, height / 2 - imageSize / 1.25 / 2, imageSize, imageSize / 1.25)
        context.font = 'regular 48pt Quicksand'
        context.fillText(translations.pronouns.intro + ':', width / leftRatio + imageSize / 1.5, height / 2 - 36)

        const pronounNameOptions = pronounName === global.config.pronouns.any ? [global.config.pronouns.any] : pronoun.nameOptions();
        context.font = `bold ${pronounNameOptions.length <= 2 ? '70' : '36'}pt Quicksand`
        context.fillText(pronounNameOptions.join('\n'), width / leftRatio + imageSize / 1.5, height / 2 + (pronounNameOptions.length <= 2 ? 72 : 24));

        return canvas.toBuffer(mime);
    });

    return res.set('content-type', mime).send(result);
}));

export default router;