Exclude libsignal-client testing libraries

buildSrc/src/main/kotlin/ExcludeFileFromJar.kt

@@ -0,0 +1,53 @@
+import org.gradle.api.artifacts.transform.*
+import org.gradle.api.file.FileSystemLocation
+import org.gradle.api.provider.Provider
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.PathSensitive
+import org.gradle.api.tasks.PathSensitivity
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.util.zip.ZipInputStream
+import java.util.zip.ZipOutputStream
+
+@CacheableTransform
+abstract class JarFileExcluder : TransformAction<JarFileExcluder.Parameters> {
+    interface Parameters : TransformParameters {
+        @get:Input
+        var excludeFilesByArtifact: Map<String, Set<String>>
+    }
+
+    @get:PathSensitive(PathSensitivity.NAME_ONLY)
+    @get:InputArtifact
+    abstract val inputArtifact: Provider<FileSystemLocation>
+
+    override
+    fun transform(outputs: TransformOutputs) {
+        val fileName = inputArtifact.get().asFile.name
+        for (entry in parameters.excludeFilesByArtifact) {
+            if (fileName.startsWith(entry.key)) {
+                val nameWithoutExtension = fileName.substring(0, fileName.lastIndexOf("."))
+                excludeFiles(inputArtifact.get().asFile, entry.value, outputs.file("${nameWithoutExtension}.jar"))
+                return
+            }
+        }
+        outputs.file(inputArtifact)
+    }
+
+    private fun excludeFiles(artifact: File, excludeFiles: Set<String>, jarFile: File) {
+        ZipInputStream(FileInputStream(artifact)).use { input ->
+            ZipOutputStream(FileOutputStream(jarFile)).use { output ->
+                var entry = input.nextEntry
+                while (entry != null) {
+                    if (!excludeFiles.contains(entry.name)) {
+                        output.putNextEntry(entry)
+                        input.copyTo(output)
+                        output.closeEntry()
+                    }
+
+                    entry = input.nextEntry
+                }
+            }
+        }
+    }
+}