Cache file in Gradle - gradle

Question

I have to download a jar file (https://repo1.maven.org/maven2/org/mock-server/mockserver-netty/5.13.2/mockserver-netty-5.13.2-jar-with-dependencies.jar).
Maven central does not contain this with-dependencies and I cannot just specify it in a dependency list (implementation("group:artifact:version-with-dependencies)).
I can download it (by creating a custom task) to the build directory, but I also would like to cache it like other dependencies (to avoid downloading it each time after cleaning the build folder).
So, it would be nice either to specify this long url and Gradle would download/cache it automatically, or to use some API to cache it manually.

Answer 1

Based on this comment solution in Kotlin:
plugins {
id("de.undercouch.download") version "5.1.0"
}
val url = "https://repo1.maven.org/maven2/org/mock-server/mockserver-netty/5.13.2/mockserver-netty-5.13.2-jar-with-dependencies.jar"
task("downloadMockServerToCache", Download::class) {
val destPath = urlToCachePath(url)
src(url)
dest(destPath)
overwrite(false)
}
task("copyMockServerFromCache", Copy::class) {
dependsOn("downloadMockServerToCache")
val destPath = urlToCachePath(url)
from(destPath) {
include(urlToCachedFile(url))
}
into("build/bin")
rename { "$mockServerArtifact.jar" }
}
fun urlToCachePath(url: String): String {
val urlWithoutProtocol = url.substringAfter("//")
val reversedDomain = reversedDomain(urlWithoutProtocol)
val fileName = urlToCachedFile(url)
val gradleHome = System.getProperty("user.home")
return "$gradleHome/.gradle/caches/modules-2/files-2.1/de.undercouch/cache/$reversedDomain/$fileName"
}
fun urlToCachedFile(url: String): String {
return url.substringAfterLast("/").substringBefore("?")
}
fun reversedDomain(urlWithoutProtocol: String) =
urlWithoutProtocol.substringBefore("/").split(".").reversed().joinToString("/")