feat: add proguard initial step into Flank configuration

buildSrc/src/main/kotlin/Deps.kt

@@ -1,4 +1,8 @@
 object Versions {
+
+    // https://github.com/Guardsquare/proguard
+    const val PROGUARD = "7.0.0"
+
     // https://github.com/bugsnag/bugsnag-java/releases
     const val BUGSNAG = "3.6.1"
 
@@ -126,6 +130,8 @@ object Libs {
 
     const val JANSI = "org.fusesource.jansi:jansi:${Versions.JANSI}"
 
+    const val PROGUARD = "com.guardsquare:proguard-gradle:${Versions.PROGUARD}"
+
     //region Plugins
     const val DETEKT_FORMATTING = "io.gitlab.arturbosch.detekt:detekt-formatting:${Versions.DETEKT}"
     //endregion

test_runner/build.gradle.kts

@@ -43,6 +43,7 @@ shadowJar.apply {
         exclude(dependency(Libs.TRUTH))
         exclude(dependency(Libs.MOCKK))
         exclude(dependency(Libs.JUNIT))
+        exclude(dependency(Libs.PROGUARD))
         exclude(dependency(Libs.DETEKT_FORMATTING))
     }
 }
@@ -251,6 +252,28 @@ dependencies {
     implementation(Libs.JANSI)
 }
 
+// Fix Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.hash.Hashing.crc32c()Lcom/google/common/hash/HashFunction;
+// https://stackoverflow.com/a/45286710
+configurations.all {
+    resolutionStrategy {
+        force("com.google.guava:guava:25.1-jre")
+        force(Libs.KOTLIN_REFLECT)
+        exclude(group = "com.google.guava", module = "guava-jdk5")
+    }
+}
+
+buildscript {
+    repositories {
+        mavenLocal()
+        jcenter()
+        google()
+    }
+    dependencies {
+        classpath(Libs.PROGUARD)
+    }
+}
+
+
 tasks.withType<KotlinCompile> {
     kotlinOptions.jvmTarget = "1.8"
 }
@@ -264,6 +287,23 @@ tasks.create("updateFlank", Exec::class.java) {
     commandLine = listOf("./bash/update_flank.sh")
 }
 
+tasks.create("applyProguard", proguard.gradle.ProGuardTask::class.java) {
+    dependsOn("updateFlank")
+    description = "Apply proguard to flank and create a minimized jar"
+    dontwarn()
+    injars("./build/libs/flank.jar")
+    outjars("./build/libs/flank-proguard.jar")
+    libraryjars("${System.getProperty("java.home")}/lib/rt.jar")
+    libraryjars("./build/libs/flank-sources.jar")
+    configuration("./proguard/config.pro")
+    doLast {
+        copy {
+            from(file("$buildDir/libs/flank-proguard.jar"))
+            into(file("./bash/"))
+        }
+    }
+}
+
 // begin --- ASCII doc generation ---
 val generateCliAsciiDoc by tasks.registering(JavaExec::class) {
     dependsOn(tasks.classes)

test_runner/proguard/config.pro

@@ -0,0 +1,70 @@
+-dontobfuscate
+-allowaccessmodification
+-keepattributes SourceFile, LineNumberTable
+-dontwarn
+-verbose
+-dontoptimize
+-dontnote kotlin.**
+-dontnote kotlinx.**
+-dontnote com.google.gson.**
+-dontnote proguard.configuration.ConfigurationLogger
+
+-keep class ftl.Main {
+	public static void main(java.lang.String[]);
+}
+
+#Kotlin
+-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
+-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
+-keepnames class kotlinx.coroutines.android.AndroidExceptionPreHandler {}
+-keepnames class kotlinx.coroutines.android.AndroidDispatcherFactory {}
+
+-keep class kotlinx.coroutines.internal.MainDispatcherFactory {}
+-keep class kotlinx.coroutines.CoroutineExceptionHandler {}
+-keep class kotlinx.coroutines.android.AndroidExceptionPreHandler {}
+-keep class kotlinx.coroutines.android.AndroidDispatcherFactory {}
+
+# Most of volatile fields are updated with AFU and should not be mangled
+-keepclassmembernames class kotlinx.** {
+    volatile <fields>;
+}
+
+# Proguard configuration for Jackson 2.x
+-keep class com.fasterxml.jackson.databind.ObjectMapper {
+    public <methods>;
+    protected <methods>;
+}
+-keep class com.fasterxml.jackson.databind.ObjectWriter {
+    public ** writeValueAsString(**);
+}
+-keepnames class com.fasterxml.jackson.** { *; }
+-keep class kotlin.Metadata { *; }
+-keep class kotlin.reflect.** { *; }
+
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+-keep class com.bugsnag.android.NativeInterface { *; }
+-keep class com.bugsnag.android.Breadcrumb { *; }
+-keep class com.bugsnag.android.Breadcrumbs { *; }
+-keep class com.bugsnag.android.Breadcrumbs$Breadcrumb { *; }
+-keep class com.bugsnag.android.BreadcrumbType { *; }
+-keep class com.bugsnag.android.Severity { *; }
+-keep class com.bugsnag.android.ndk.BugsnagObserver { *; }
+# Picocli
+-keep class picocli.** { *; }
+-keep interface picocli.** { *; }
+
+#ftl
+-keep class ftl.** { *; }
+-keep interface ftl.** { *; }
+
+#google auth
+-keep class com.google.auth.** { *; }
+-keep interface com.google.auth.** { *; }
+
+#ctc wstx
+-keep class com.ctc.wstx.** { *; }
+-keep interface com.ctc.wstx.** { *; }