ImageCompressor.kt

import org.json.JSONObject
import java.io.File

const val tinyPngApiKey = "<YOUR-API-KEY-GOES-HERE>"
val projectDir = File("<PATH-TOPROJECT-ROOT>")
val supportedExtensions = listOf("png", "jpg")

fun main() {
    projectDir.walk().forEach { srcFile ->
        if (supportedExtensions.contains(srcFile.extension)) {
            try {
                val outputUrl = compress(srcFile)
                println("Downloading... -> $outputUrl")
                downloadAndReplace(
                    outputUrl,
                    file = srcFile // replace
                )
                println("✅ Saved")
            } catch (e: Exception) {
                println("Failed to compress: ${e.message} -> ${e.message}")
            }
        }
    }
}

fun compress(
    srcFile: File
) : String {
    println("Compressing ${srcFile.absolutePath}")
    val compressCurl =
        "curl --user api:$tinyPngApiKey --data-binary @${srcFile.absolutePath} https://api.tinify.com/shrink"
    val process = Runtime.getRuntime().exec(compressCurl)
    return process.inputStream.bufferedReader().readText().let {
        val joResponse = JSONObject(it)
        val joInput = joResponse.getJSONObject("input")
        val inputSize = joInput.getLong("size") / 1000
        val joOutput = joResponse.getJSONObject("output")
        val outputSize = joOutput.getLong("size") / 1000
        val outputUrl = joOutput.getString("url")

        println("input: $inputSize kb -> output -> $outputSize kb")
        outputUrl
    }
}

fun downloadAndReplace(url: String, file: File) {
    val wget = "wget $url -O ${file.absolutePath}"
    val process = Runtime.getRuntime().exec(wget)
    val output = process.inputStream.bufferedReader().readText()
    println(output)
}