WIP: Add java8Jar Gradle task for -api and -bouncy

This worked locally (i.e. it successfully built the -java8 jars in
the respective build output directories, but the changes added to
maven-publish.gradle do not work and also partly duplicate the
changes in the -api and -bouncy files.

Author: msgilligan

build.gradle

@@ -4,6 +4,7 @@ plugins {
 
 // Projects to be published with maven-publish
 ext.publishedProjects = ['secp-api', 'secp-ffm', 'secp-bouncy']
+ext.publishedJava8Projects = ['secp-api', 'secp-bouncy']
 
 subprojects { sub ->
     apply plugin: 'java'

gradle/maven-publish.gradle

@@ -7,8 +7,18 @@ subprojects { sub ->
             publications {
                 jar(MavenPublication) {
                     from components.java
+                    if (sub.name in publishedJava8Projects) {
+                        tasks.register('java8Jar', Jar) {
+                            dependsOn tasks.jar
+                            archiveBaseName = "${sub.name}-java8"
+                            from zipTree(tasks.jar.archiveFile)
+                            exclude 'module-info.class'
+                        }
+                        artifacts {
+                            archives tasks.java8Jar
+                        }
+                    }
                 }
-
             }
             repositories {
                 def secpJdkGitLabProjectId = "55956336"

secp-api/build.gradle

@@ -27,3 +27,15 @@ jar {
                 'Implementation-Version': archiveVersion.get()
     }
 }
+
+tasks.register('java8Jar', Jar) {
+    dependsOn tasks.jar                 // Depend on the original Java 9 JAR
+    archiveBaseName = "${project.name}-java8"
+    from zipTree(tasks.jar.archiveFile) // Unpack the original JAR
+    exclude 'module-info.class'         // Remove the module-info.class file
+
+    // Copy the original manifest
+    manifest {
+        from tasks.jar.manifest
+    }
+}

secp-bouncy/build.gradle

@@ -28,3 +28,15 @@ jar {
                 'Implementation-Version': archiveVersion.get()
     }
 }
+
+tasks.register('java8Jar', Jar) {
+    dependsOn tasks.jar                 // Depend on the original Java 9 JAR
+    archiveBaseName = "${project.name}-java8"
+    from zipTree(tasks.jar.archiveFile) // Unpack the original JAR
+    exclude 'module-info.class'         // Remove the module-info.class file
+
+    // Copy the original manifest
+    manifest {
+        from tasks.jar.manifest
+    }
+}