lib/sticker.js

import { dirname } from 'path'
import { fileURLToPath } from 'url'
import * as fs from 'fs'
import * as path from 'path'
import * as  crypto from 'crypto'
import { ffmpeg } from './converter.js'
import fluent_ffmpeg from 'fluent-ffmpeg'
import { spawn } from 'child_process'
import uploadFile from './uploadFile.js'
import uploadImage from './uploadImage.js'
import { fileTypeFromBuffer } from 'file-type'
import webp from 'node-webpmux'
import fetch from 'node-fetch'

const __dirname = dirname(fileURLToPath(import.meta.url))
const tmp = path.join(__dirname, '../tmp')
/**
 * Image to Sticker
 * @param {Buffer} img Image Buffer
 * @param {String} url Image URL
 */
function sticker2(img, url) {
  return new Promise(async (resolve, reject) => {
    try {
      if (url) {
        let res = await fetch(url)
        if (res.status !== 200) throw await res.text()
        img = await res.buffer()
      }
      let inp = path.join(tmp, +new Date + '.jpeg')
      await fs.promises.writeFile(inp, img)
      let ff = spawn('ffmpeg', [
        '-y',
        '-i', inp,
        '-vf', 'scale=512:512:flags=lanczos:force_original_aspect_ratio=decrease,format=rgba,pad=512:512:(ow-iw)/2:(oh-ih)/2:color=#00000000,setsar=1',
        '-f', 'png',
        '-'
      ])
      ff.on('error', reject)
      ff.on('close', async () => {
        await fs.promises.unlink(inp)
      })
      let bufs = []
      const [_spawnprocess, ..._spawnargs] = [...(module.exports.support.gm ? ['gm'] : module.exports.magick ? ['magick'] : []), 'convert', 'png:-', 'webp:-']
      let im = spawn(_spawnprocess, _spawnargs)
      im.on('error', e => conn.reply(m.chat, util.format(e), m))
      im.stdout.on('data', chunk => bufs.push(chunk))
      ff.stdout.pipe(im.stdin)
      im.on('exit', () => {
        resolve(Buffer.concat(bufs))
      })
    } catch (e) {
      reject(e)
    }
  })
}

async function canvas(code, type = 'png', quality = 0.92) {
  let res = await fetch('https://nurutomo.herokuapp.com/api/canvas?' + queryURL({
    type,
    quality
  }), {
    method: 'POST',
    headers: {
      'Content-Type': 'text/plain',
      'Content-Length': code.length
    },
    body: code
  })
  let image = await res.buffer()
  return image
}

function queryURL(queries) {
  return new URLSearchParams(Object.entries(queries))
}

/**
 * Image to Sticker
 * @param {Buffer} img Image Buffer
 * @param {String} url Image URL
 */
async function sticker1(img, url) {
  url = url ? url : await uploadImage(img)
  let {
    mime
  } = url ? { mime: 'image/jpeg' } : await fileTypeFromBuffer(img)
  let sc = `let im = await loadImg('data:${mime};base64,'+(await window.loadToDataURI('${url}')))
c.width = c.height = 512
let max = Math.max(im.width, im.height)
let w = 512 * im.width / max
let h = 512 * im.height / max
ctx.drawImage(im, 256 - w / 2, 256 - h / 2, w, h)
`
  return await canvas(sc, 'webp')
}

/**
 * Image/Video to Sticker
 * @param {Buffer} img Image/Video Buffer
 * @param {String} url Image/Video URL
 * @param {String} packname EXIF Packname
 * @param {String} author EXIF Author
 */
async function sticker3(img, url, packname, author) {
  url = url ? url : await uploadFile(img)
  let res = await fetch('https://api.xteam.xyz/sticker/wm?' + new URLSearchParams(Object.entries({
    url,
    packname,
    author
  })))
  return await res.buffer()
}

/**
 * Image to Sticker
 * @param {Buffer} img Image/Video Buffer
 * @param {String} url Image/Video URL
 */
async function sticker4(img, url) {
  if (url) {
    let res = await fetch(url)
    if (res.status !== 200) throw await res.text()
    img = await res.buffer()
  }
  return await ffmpeg(img, [
    '-vf', 'scale=512:512:flags=lanczos:force_original_aspect_ratio=decrease,format=rgba,pad=512:512:(ow-iw)/2:(oh-ih)/2:color=#00000000,setsar=1'
  ], 'jpeg', 'webp')
}

async function sticker5(img, url, packname, author, categories = [''], extra = {}) {
  const { Sticker } = await import('wa-sticker-formatter')
  const stickerMetadata = {
    type: 'full',
    pack: packname,
    author,
    categories,
    ...extra
  }
  return (new Sticker(img ? img : url, stickerMetadata)).toBuffer()
}

/**
 * Convert using fluent-ffmpeg
 * @param {string} img 
 * @param {string} url 
 */
function sticker6(img, url) {
  return new Promise(async (resolve, reject) => {
    if (url) {
      let res = await fetch(url)
      if (res.status !== 200) throw await res.text()
      img = await res.buffer()
    }
    const type = await fileTypeFromBuffer(img) || {
      mime: 'application/octet-stream',
      ext: 'bin'
    }
    if (type.ext == 'bin') reject(img)
    const tmp = path.join(__dirname, `../tmp/${+ new Date()}.${type.ext}`)
    const out = path.join(tmp + '.webp')
    await fs.promises.writeFile(tmp, img)
    // https://github.com/MhankBarBar/termux-wabot/blob/main/index.js#L313#L368
    let Fffmpeg = /video/i.test(type.mime) ? fluent_ffmpeg(tmp).inputFormat(type.ext) : fluent_ffmpeg(tmp).input(tmp)
    Fffmpeg
      .on('error', function (err) {
        console.error(err)
        fs.promises.unlink(tmp)
        reject(img)
      })
      .on('end', async function () {
        fs.promises.unlink(tmp)
        resolve(await fs.promises.readFile(out))
      })
      .addOutputOptions([
        `-vcodec`, `libwebp`, `-vf`,
        `scale='min(320,iw)':min'(320,ih)':force_original_aspect_ratio=decrease,fps=15, pad=320:320:-1:-1:[email protected], split [a][b]; [a] palettegen=reserve_transparent=on:transparency_color=ffffff [p]; [b][p] paletteuse`
      ])
      .toFormat('webp')
      .save(out)
  })
}
/**
 * Add WhatsApp JSON Exif Metadata
 * Taken from https://github.com/pedroslopez/whatsapp-web.js/pull/527/files
 * @param {Buffer} webpSticker 
 * @param {String} packname 
 * @param {String} author 
 * @param {String} categories 
 * @param {Object} extra 
 * @returns 
 */
async function addExif(webpSticker, packname, author, categories = [''], extra = {}) {
  const img = new webp.Image();
  const stickerPackId = crypto.randomBytes(32).toString('hex');
  const json = { 'sticker-pack-id': stickerPackId, 'sticker-pack-name': packname, 'sticker-pack-publisher': author, 'emojis': categories, ...extra };
  let exifAttr = Buffer.from([0x49, 0x49, 0x2A, 0x00, 0x08, 0x00, 0x00, 0x00, 0x01, 0x00, 0x41, 0x57, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16, 0x00, 0x00, 0x00]);
  let jsonBuffer = Buffer.from(JSON.stringify(json), 'utf8');
  let exif = Buffer.concat([exifAttr, jsonBuffer]);
  exif.writeUIntLE(jsonBuffer.length, 14, 4);
  await img.load(webpSticker)
  img.exif = exif
  return await img.save(null)
}

/**
 * Image/Video to Sticker
 * @param {Buffer} img Image/Video Buffer
 * @param {String} url Image/Video URL
 * @param {...String} 
*/
async function sticker(img, url, ...args) {
  let lastError, stiker
  for (let func of [
    sticker3, global.support.ffmpeg && sticker6, sticker5,
    global.support.ffmpeg && global.support.ffmpegWebp && sticker4,
    global.support.ffmpeg && (global.support.convert || global.support.magick || global.support.gm) && sticker2,
    sticker1
  ].filter(f => f)) {
    try {
      stiker = await func(img, url, ...args)
      if (stiker.includes('WEBP')) {
        try {
          return await addExif(stiker, ...args)
        } catch (e) {
          console.error(e)
          return stiker
        }
      }
      if (stiker.includes('html')) continue
      throw stiker.toString()
    } catch (err) {
      lastError = err
      continue
    }
  }
  console.error(lastError)
  return lastError
}

const support = {
  ffmpeg: true,
  ffprobe: true,
  ffmpegWebp: true,
  convert: true,
  magick: false,
  gm: false,
  find: false
}

export {
  sticker,
  sticker1,
  sticker2,
  sticker3,
  sticker4, sticker5,
  sticker6,
  addExif,
  support
}