build.gradle.kts

plugins {
    kotlin("jvm") version "1.9.21"
    id("application")
}

repositories {
    mavenCentral()
}

val kotlinSdkVersion = "1.0.41"
val smithyKotlinVersion = "1.0.10"
dependencies {
    implementation("aws.sdk.kotlin:s3:$kotlinSdkVersion")
    implementation("aws.sdk.kotlin:s3control:$kotlinSdkVersion")
    implementation("aws.sdk.kotlin:sts:$kotlinSdkVersion")
    implementation("aws.sdk.kotlin:secretsmanager:$kotlinSdkVersion")
    implementation("aws.smithy.kotlin:http-client-engine-okhttp:$smithyKotlinVersion")
    implementation("aws.smithy.kotlin:http-client-engine-crt:$smithyKotlinVersion")
    implementation("aws.smithy.kotlin:aws-signing-crt:$smithyKotlinVersion")
    implementation("aws.smithy.kotlin:http-auth-aws:$smithyKotlinVersion")
    implementation("com.squareup.okhttp3:okhttp:4.12.0")
    implementation("org.apache.logging.log4j:log4j-slf4j2-impl:2.20.0")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1")
    implementation("com.google.code.gson:gson:2.10")
    implementation("com.fasterxml.jackson.core:jackson-databind:2.14.2")
}

application {
    mainClass.set("com.kotlin.s3.MainKt")
}

main.kt

package com.kotlin.s3

import aws.sdk.kotlin.services.s3.S3Client
import aws.sdk.kotlin.services.s3.model.CreateBucketRequest
import aws.sdk.kotlin.services.s3.model.DeleteBucketRequest
import aws.sdk.kotlin.services.s3.model.DeleteObjectRequest
import aws.sdk.kotlin.services.s3.model.GetObjectRequest
import aws.sdk.kotlin.services.s3.model.PutObjectRequest
import aws.sdk.kotlin.services.s3.presigners.presignGetObject
import aws.sdk.kotlin.services.s3.presigners.presignPutObject
import aws.sdk.kotlin.services.s3.waiters.waitUntilBucketExists
import aws.sdk.kotlin.services.s3.waiters.waitUntilBucketNotExists
import aws.sdk.kotlin.services.s3.waiters.waitUntilObjectExists
import aws.sdk.kotlin.services.s3.waiters.waitUntilObjectNotExists
import aws.smithy.kotlin.runtime.auth.awssigning.AwsSignatureType
import aws.smithy.kotlin.runtime.auth.awssigning.AwsSigningAlgorithm
import aws.smithy.kotlin.runtime.auth.awssigning.crt.CrtAwsSigner
import aws.smithy.kotlin.runtime.content.ByteStream
import aws.smithy.kotlin.runtime.http.request.HttpRequest
import aws.smithy.kotlin.runtime.time.Instant
import kotlinx.coroutines.runBlocking
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import java.net.URL
import java.util.UUID
import kotlin.system.exitProcess
import kotlin.time.Duration.Companion.hours

fun main(): Unit = runBlocking {
    // Setup these ENVs AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN
    val s3 = S3Client.fromEnvironment() { region = "ap-southeast-1" }
    val bucketName = "bucket"
    val keyName = "key"

    println(getObjectPresigned(s3, bucketName, keyName))

    exitProcess(1)
}

suspend fun getObjectPresigned(s3: S3Client, bucketName: String, keyName: String): String {
    // Create a GetObjectRequest.
    val unsignedRequest = GetObjectRequest {
        bucket = bucketName
        key = keyName
    }

    // Presign the GetObject request.
    val presignedRequest = s3.presignGetObject(unsignedRequest, 24.hours)

    return presignedRequest.url.toString()
}