exif.js

/** 
 * Originally created by cwke
 * Reuploaded by Waxaranai
 * Recoded by SlavyanDesu
 *
 * GitHub is an open-source community, so why are you so triggered when someone shared some simple code?
 */

const fs = require('fs-extra')
const packID = 'com.snowcorp.stickerly.android.stickercontentprovider b5e7275f-f1de-4137-961f-57becfad34f2'
const playstore = 'https://play.google.com/store/apps/details?id=com.marsvard.stickermakerforwhatsapp'
const itunes = 'https://itunes.apple.com/app/sticker-maker-studio/id1443326857'

/**
 * @class Exif
 */
module.exports = class Exif {
    /**
     * Create an EXIF file.
     * @param {String} packname 
     * @param {String} authorname 
     * @param {String} [filename=data]
     */
    create(packname, authorname, filename) {
        if (!filename) filename = 'data'
        const json = {
            'sticker-pack-id': packID,
            'sticker-pack-name': packname,
            'sticker-pack-publisher': authorname,
            'android-app-store-link': playstore,
            'ios-app-store-link': itunes
        }
        let len = JSON.stringify(json).length
        const f = Buffer.from([0x49, 0x49, 0x2A, 0x00, 0x08, 0x00, 0x00, 0x00, 0x01, 0x00, 0x41, 0x57, 0x07, 0x00])
        const code = [0x00, 0x00, 0x16, 0x00, 0x00, 0x00]
        if (len > 256) {
            len = len - 256
            code.unshift(0x01)
        } else {
            code.unshift(0x00)
        }
        const fff = Buffer.from(code)
        const ffff = Buffer.from(JSON.stringify(json))
        if (len < 16) {
            len = len.toString(16)
            len = '0' + len
        } else {
            len = len.toString(16)
        }
        const ff = Buffer.from(len, 'hex')
        const buffer = Buffer.concat([f, ff, fff, ffff])
        fs.writeFile(`./temp/${filename}.exif`, buffer, (err) => {
            if (err) return console.error(err)
            console.log('Success!')
        })
    }
}