Use env.AWS_ROLE_ARN for publishing

build.gradle

@@ -1,4 +1,6 @@
 import groovy.io.FileType
+import com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider
+import com.amazonaws.services.s3.AmazonS3Client
 
 apply plugin: 'java-library'
 apply plugin: 'maven-publish'
@@ -10,6 +12,19 @@ task wrapper(type: Wrapper) {
     gradleVersion = '4.0'
 }
 
+buildscript {
+    repositories {
+        mavenCentral()
+        maven {
+            url "https://libraries.minecraft.net"
+        }
+    }
+
+    dependencies {
+        classpath 'com.amazonaws:aws-java-sdk:1.11.33'
+    }
+}
+
 repositories {
     maven {
         url "https://libraries.minecraft.net"
@@ -79,6 +94,18 @@ task report {
     }
 }
 
+def publishDir = file("$buildDir/repo")
+
+
+def uploadFile(s3, bucket, path, filename) {
+    println "Uploading $filename to $bucket as $path"
+    s3.putObject(bucket, path, filename)
+}
+
+clean.doLast {
+    delete publishDir
+}
+
 if (version.endsWith("SNAPSHOT")) {
     publishing.repositories {
         mavenLocal()
@@ -86,9 +113,19 @@ if (version.endsWith("SNAPSHOT")) {
 } else {
     publishing.repositories {
         maven {
-            url "s3://minecraft-libraries/"
-            authentication {
-               awsIm(AwsImAuthentication)
+           url "$buildDir/repo"
+        }
+    }
+
+    publish.doLast {
+        def AWSRoleARN = (System.getenv("AWS_ROLE_ARN") != null && System.getenv("AWS_ROLE_ARN") != "" ? System.getenv("AWS_ROLE_ARN") : null)
+        if (AWSRoleARN == null) throw new GradleException("AWS Role has not been configured, use the `AWS_ROLE_ARN` environment variable")
+        def auth = new STSAssumeRoleSessionCredentialsProvider.Builder(AWSRoleARN, "JavaBrigadierPublish").build()
+        def s3 = new AmazonS3Client(auth)
+        publishDir.eachFileRecurse {
+            if (!it.name.contains(".xml") && it.isFile()) {
+                def relPath = publishDir.toPath().relativize(it.toPath()).toFile().toString().replaceAll('\\\\', '/')
+                uploadFile(s3, "minecraft-libraries", relPath, it)
             }
         }
     }