convert/index.ts

import { Hono } from 'hono'
const app = new Hono()
const joypixels = require("emoji-toolkit");
import { mkdirSync, writeFileSync, existsSync, rmSync, readFileSync, readFile, writeFile } from 'fs'
import { $ } from 'bun';
import ytSearch from 'yt-search';
import { writeMDFPWMv3 } from './mdfpwmWriter';
let ytdlpPath = "yt-dlp"
if(existsSync("./yt-dlp")) {
    ytdlpPath = "./yt-dlp"
}

app.post("/youtube", async (c) => {
    const auth = c.req.header('Authorization')
    if (auth !== process.env.PASSWORD) {
        return c.text('Unauthorized', 401)
    }

    const body = await c.req.json().catch(() => null);
    if (!body || typeof body.title !== 'string' || typeof body.artist !== 'string') {
        return c.text('Missing or invalid title/artist', 400);
    }

    let title = body.title;
    let artist = body.artist;
    let filename;
    if(body.mdfpwm) {
        filename = "cache/"+Bun.hash(title+"-"+artist)+".mdfpwm"

        if(!existsSync(filename)) {
            const searchResult = await ytSearch(`${artist} ${title}`);
            const video = searchResult.videos[0];
            if (!video) throw new Error("No video found");
            console.log(video)

            await $`${ytdlpPath} --audio-format opus -x ${video.url} -o test`;
                        console.timeEnd("yt-dlp")

            // this makes left.dfpwm & right.dfpwm
            await $`ffmpeg -i test.opus -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]; [left]highpass=f=60,lowpass=f=15000,dynaudnorm[leftf]; [right]highpass=f=60,lowpass=f=15000,dynaudnorm[rightf]" -map "[leftf]"  -ar 48000 -f dfpwm left.dfpwm -map "[rightf]" -ar 48000 -f dfpwm right.dfpwm`
            rmSync("test.opus")

            writeFileSync(filename, writeMDFPWMv3(
                readFileSync("left.dfpwm"),
                readFileSync("right.dfpwm"),
                { title: title, artist: artist, album: title }
            ))

            rmSync("right.dfpwm")
            rmSync("left.dfpwm")
        }
    } else {
        filename = "cache/"+Bun.hash(title+"-"+artist)+".dfpwm"

        if(!existsSync(filename)) {
            const searchResult = await ytSearch(`${artist} ${title}`);
            const video = searchResult.videos[0];
            if (!video) throw new Error("No video found");
            console.log(video)
            await $`${ytdlpPath} --audio-format opus -x ${video.url} -o test`;
            await $`ffmpeg -i test.opus -af "highpass=f=60, lowpass=f=15000, dynaudnorm" -ar 48000 -ac 1 -f dfpwm "${filename}"`;
            rmSync("test.opus")
        }
    }
    
    return c.body(readFileSync(filename), {
        headers: {
            'Content-Type': `audio/vnd.${body.mdfpwm ? "m" : ""}dfpwm`,
            'Content-Disposition': `attachment; filename="${filename}"`,
        },
    });
    
})
app.post('/render', async (c) => {
    const auth = c.req.header('Authorization')
    if (auth !== process.env.PASSWORD) {
        return c.text('Unauthorized', 401)
    }

    const body = await c.req.json().catch(() => null)

    let extraArgs = "-b"

    let filename;
    let size;

    if (body.size) {
        if (typeof body.size !== 'string' || !/^\d{1,4}x\d{1,4}$/.test(body.size)) {
        return c.text('size must be a string in the format <number>x<number>', 400);
        }
        const [w, h] = body.size.split('x').map(Number);
        if (
            isNaN(w) || isNaN(h) ||
            w < 1 || h < 1 ||
            w > 1000 || h > 1000
        ) {
            return c.text('size must be in the format <number>x<number> with max 1000x1000', 400);
        }

        size = { width: w, height: h };

        extraArgs += ` -W ${w} -H ${h}`;
    }   
    if(body?.extraArgs) {
        if (typeof body.extraArgs !== 'string') {
            return c.text('extraArgs must be a string', 400)
        }
        extraArgs = body.extraArgs;
    }

    if(body.emoji) {
        if(size) {
            const inputSize = Math.min(size.width, size.height);
            const allowedSizes = [32, 64, 128];
            let closest = allowedSizes.reduce((prev, curr) =>
                Math.abs(curr - inputSize) < Math.abs(prev - inputSize) ? curr : prev
            );
            joypixels.emojiSize = closest;
        }

        const emojiHtml = joypixels.toImage(body.emoji)
        const urlMatch = emojiHtml.match(/src="([^"]*)"/)
        if (!urlMatch) {
            return c.text('Could not extract emoji URL', 500)
        }

        let emojiUrl = urlMatch[1]
        console.log(emojiUrl)
        filename = "cache/" + emojiUrl.split('/').pop().split(".")[0] + `-${size ? body.size : joypixels.emojiSize}.png`;
        if(!existsSync(filename)) {

            // Download the image
            const res = await fetch(emojiUrl)
            if (!res.ok) {
                return c.text('Failed to download emoji image', 500)
            }
            const arrayBuffer = await res.arrayBuffer()
            const buffer = Buffer.from(arrayBuffer)

            // Ensure cache directory exists
            if (!existsSync('cache')) {
                mkdirSync('cache')
            }

            // Get filename from URL
            writeFileSync(filename, buffer)
        }
    } else if(body.imageUrl) {
        const imageUrl = body.imageUrl;
        filename = `cache/${imageUrl.split('/').pop()}-${size ? body.size : "original"}`;
        if (!existsSync(filename)) {
            const res = await fetch(imageUrl);
            if (!res.ok) {
                return c.text('Failed to download image', 500);
            }
            const arrayBuffer = await res.arrayBuffer();
            const buffer = Buffer.from(arrayBuffer);

            if (!existsSync('cache')) {
                mkdirSync('cache');
            }
            
            writeFileSync(filename, buffer);
        }
        
    } else {
        return c.text('Please provide either emoji or imageUrl', 400);
    }

    if(!existsSync(filename+".bimg")) {
        let sanjuuniPath = "sanjuuni";
        
        if(existsSync("./sanjuuni")) {
            sanjuuniPath = "./sanjuuni";
        }
        console.log(`${sanjuuniPath} --disable-opencl ${extraArgs} -i ${filename} -o ${filename+".bimg"}`)
        await $`${sanjuuniPath} --disable-opencl ${extraArgs} -i ${filename} -o ${filename+".bimg"}`
    }

    const bimg = readFileSync(filename + ".bimg", "utf8");

    return c.text(bimg)
})

export default { 
  port: 7427,
  host: "127.0.0.1",
  fetch: app.fetch, 
}