init.gradle file for proxying all repositories with Sonatype Nexus, with blacklisting feature for excluded projects. also adds plugin repository handling and a disable flag

init.gradle

/**
 * init.gradle file for development using Nexus as proxy repository
 *
 * @author Manfred Moser <manfred@simpligility.com
 * akom added blacklisting feature to leave certain projects alone.
 */

apply plugin: NexusRepositoryPlugin

class NexusRepositoryPlugin implements Plugin<Gradle> {

    final static String LOG_PREFIX = "[init]NexusRepositoryPlugin:"
    //Do not alter projects that define a maven repository with this URL:
    final static String BLACKLISTED_REPO_URL_SUBSTRING = 'some.internal.domain'
    //passing -DNexusRepositoryPluginDisable=true prevents plugin execution
    final static String DISABLE_PROPERTY = 'NexusRepositoryPluginDisable'

    final Closure NexusConfig = {
        maven {
            name = 'standard-nexus'
            url = 'http://MY.INTERNAL.NEXUS.URL/content/groups/public'
        }
        // if required you can add further repositories or groups here and they will
        // be left intact if the name starts with standard-
        // although it is better to just add those repositories in Nexus
        // and expose them via the public group
    }

    final Closure RepoHandler = {
        all { ArtifactRepository repo ->
            if (repo.name.toString().startsWith("standard-")) {
                println "$LOG_PREFIX    $repo.name at $repo.url activated as repository."
            } else {
                if (repo instanceof MavenArtifactRepository) {
                    remove repo
                    println "$LOG_PREFIX    $repo.name at $repo.url removed."
                } else if (repo.name.startsWith('__plugin_repository__')) {
                    //also handle any plugin repo
                    remove repo
                    println "$LOG_PREFIX    $repo.name removed."
                } else {
                    println "$LOG_PREFIX    $repo.name kept (not a Maven repository: ${repo.class})."
                }
            }
        }
    }

    void apply(Gradle gradle) {
        if (System.properties[DISABLE_PROPERTY]) {
            println "$LOG_PREFIX Disabled by property, not modifying repository information"
            return
        }

        // Override all project specified Maven repos with standard defined in here
        gradle.allprojects { project ->

            //check if they have blacklisted repos
            if (project.repositories.find { ArtifactRepository repo ->
                "${repo.url}".indexOf(BLACKLISTED_REPO_URL_SUBSTRING) >= 0
            }) {
                println "$LOG_PREFIX ${project}: Not changing repositories, Blacklisted repos detected."
                return
            }
            println "$LOG_PREFIX  ${project}: Reconfiguring repositories and buildscript repositories."
            project.repositories RepoHandler
            project.buildscript.repositories RepoHandler

            // The minecraftforge repo has problems being proxied so we need to leave it in place directly.
            project.repositories NexusConfig
            project.buildscript.repositories NexusConfig
        }
    }

}