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exif.js
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const fs = require('fs')
const { tmpdir } = require("os")
const Crypto = require("crypto")
const ff = require('fluent-ffmpeg')
const webp = require("node-webpmux")
const path = require("path")
async function imageToWebp (media) {
const tmpFileOut = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
const tmpFileIn = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.jpg`)
fs.writeFileSync(tmpFileIn, media)
await new Promise((resolve, reject) => {
ff(tmpFileIn)
.on("error", reject)
.on("end", () => resolve(true))
.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(tmpFileOut)
})
const buff = fs.readFileSync(tmpFileOut)
fs.unlinkSync(tmpFileOut)
fs.unlinkSync(tmpFileIn)
return buff
}
async function videoToWebp (media) {
const tmpFileOut = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
const tmpFileIn = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.mp4`)
fs.writeFileSync(tmpFileIn, media)
await new Promise((resolve, reject) => {
ff(tmpFileIn)
.on("error", reject)
.on("end", () => resolve(true))
.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",
"-loop",
"0",
"-ss",
"00:00:00",
"-t",
"00:00:05",
"-preset",
"default",
"-an",
"-vsync",
"0"
])
.toFormat("webp")
.save(tmpFileOut)
})
const buff = fs.readFileSync(tmpFileOut)
fs.unlinkSync(tmpFileOut)
fs.unlinkSync(tmpFileIn)
return buff
}
async function writeExifImg (media, metadata) {
let wMedia = await imageToWebp(media)
const tmpFileIn = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
const tmpFileOut = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
fs.writeFileSync(tmpFileIn, wMedia)
if (metadata.packname || metadata.author) {
const img = new webp.Image()
const json = { "sticker-pack-id": `https://github.com/DikaArdnt/Hisoka-Morou`, "sticker-pack-name": metadata.packname, "sticker-pack-publisher": metadata.author, "emojis": metadata.categories ? metadata.categories : [""] }
const 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])
const jsonBuff = Buffer.from(JSON.stringify(json), "utf-8")
const exif = Buffer.concat([exifAttr, jsonBuff])
exif.writeUIntLE(jsonBuff.length, 14, 4)
await img.load(tmpFileIn)
fs.unlinkSync(tmpFileIn)
img.exif = exif
await img.save(tmpFileOut)
return tmpFileOut
}
}
async function writeExifVid (media, metadata) {
let wMedia = await videoToWebp(media)
const tmpFileIn = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
const tmpFileOut = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
fs.writeFileSync(tmpFileIn, wMedia)
if (metadata.packname || metadata.author) {
const img = new webp.Image()
const json = { "sticker-pack-id": `https://dikode-team.com`, "sticker-pack-name": metadata.packname, "sticker-pack-publisher": metadata.author, "emojis": metadata.categories ? metadata.categories : [""] }
const 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])
const jsonBuff = Buffer.from(JSON.stringify(json), "utf-8")
const exif = Buffer.concat([exifAttr, jsonBuff])
exif.writeUIntLE(jsonBuff.length, 14, 4)
await img.load(tmpFileIn)
fs.unlinkSync(tmpFileIn)
img.exif = exif
await img.save(tmpFileOut)
return tmpFileOut
}
}
module.exports = { imageToWebp, videoToWebp, writeExifImg, writeExifVid }