maven central compatible pom generation

build.gradle

plugins {
    id 'base'
    id 'idea'
}

ext {
    libs = subprojects.collect { it.name }.findAll { !(it in ['bom', 'modules']) }
    addRequiredMetadata = this.&addRequiredMetadata
}

allprojects {
    group 'com.github.slamdev.microframework'
}

subprojects {
    afterEvaluate { module ->
        if (module.plugins.hasPlugin('io.spring.dependency-management')) {
            dependencyManagement {
                dependencies {
                    dependency 'com.google.guava:guava:23.0'
                    dependency 'com.google.code.gson:gson:2.8.1'
                    dependency 'com.squareup.okhttp3:okhttp:3.8.1'
                    dependency 'org.easybatch:easybatch-core:5.1.0'
                    dependency 'org.easybatch:easybatch-jdbc:5.1.0'
                    dependency 'org.easybatch:easybatch-flatfile:5.1.0'
                    dependency 'org.easybatch:easybatch-json:5.1.0'
                    dependency 'io.undertow:undertow-core:1.4.18.Final'
                    dependency 'com.typesafe:config:1.3.1'
                    dependency 'org.slf4j:slf4j-api:1.7.25'
                    dependency 'ch.qos.logback:logback-classic:1.2.3'
                    dependency 'ch.qos.logback:logback-access:1.2.3'
                    dependency 'org.projectlombok:lombok:1.16.18'
                    dependency 'org.jdbi:jdbi:2.78'
                    dependency 'org.flywaydb:flyway-core:4.2.0'
                    dependency 'com.google.guava:guava:23.0'
                    dependency 'com.zaxxer:HikariCP:2.6.3'
                    dependency 'com.h2database:h2:1.4.196'
                    dependency 'org.assertj:assertj-core:3.8.0'
                    dependency 'junit:junit:4.12'
                    dependency 'org.mockito:mockito-core:2.9.0'
                    dependency 'org.postgresql:postgresql:42.1.4'
                    dependency 'org.slf4j:jul-to-slf4j:1.7.25'
                    dependency 'com.jayway.jsonpath:json-path:2.4.0'
                    dependency 'com.google.cloud:google-cloud-storage:1.4.0'
                }
            }
        }
        if (module.plugins.hasPlugin('maven-publish') && module.plugins.hasPlugin('signing')) {
            if (module.name != 'bom') {
                javadoc {
                    source = sourceSets.main.allJava
                }
                task sourceJar(type: Jar) {
                    from sourceSets.main.allJava
                    classifier 'sources'
                }
                task javadocJar(type: Jar) {
                    from javadoc
                    classifier 'javadoc'
                }

                tasks.withType(AbstractPublishToMaven) { task ->
                    task.dependsOn signArchives
                }

                artifacts {
                    archives jar
                    archives sourceJar
                    archives javadocJar
                }

                signing {
                    sign configurations.archives
                }

                publishing {
                    publications {
                        "$project.name"(MavenPublication) {
                            addRequiredMetadata(module, pom)
                            pom.withXml {
                                def pomFile = file("${project.buildDir}/generated-pom.xml")
                                writeTo(pomFile)
                                def pomAscFile = signing.sign(pomFile).signatureFiles[0]
                                artifact(pomAscFile) {
                                    classifier = null
                                    extension = 'pom.asc'
                                }
                                pomFile.delete()
                            }
                            from components.java
                            artifact sourceJar
                            artifact javadocJar
                            project.tasks.signArchives.signatureFiles.each {
                                artifact(it) {
                                    def matcher = it.file =~ /-(sources|javadoc)\.jar\.asc$/
                                    if (matcher.find()) {
                                        classifier = matcher.group(1)
                                    } else {
                                        classifier = null
                                    }
                                    extension = 'jar.asc'
                                }
                            }
                        }
                    }
                }
            }
            publishing {
                repositories {
                    maven {
                        url 'https://oss.sonatype.org/service/local/staging/deploy/maven2'
                        credentials {
                            username sonatypeUsername
                            password sonatypePassword
                        }
                    }
                }
            }
        }
    }
}

void addRequiredMetadata(Project currentProject, org.gradle.api.publish.maven.MavenPom pom) {
    pom.withXml { xml ->
        def root = xml.asNode()
        root.children().last() + {
            resolveStrategy = DELEGATE_FIRST
            description currentProject.description
            name currentProject.name
            url 'https://github.com/slamdev/micro-framework'
            organization {
                name 'Slamdev'
                url 'https://github.com/slamdev'
            }
            issueManagement {
                system 'GitHub'
                url 'https://github.com/slamdev/micro-framework/issues'
            }
            licenses {
                license {
                    name 'MIT License'
                    url 'https://github.com/slamdev/micro-framework/blob/master/LICENSE'
                    distribution 'repo'
                }
            }
            scm {
                url 'https://github.com/slamdev/micro-framework/'
                connection 'scm:git:git://github.com/slamdev/micro-framework.git'
                developerConnection 'scm:git:ssh://git@github.com/slamdev/micro-framework.git'
            }
            developers {
                developer {
                    id 'slamdev'
                    name 'slamdev'
                    email 'slamdev@gmail.com'
                    timezone '+2'
                }
            }
        }
    }
}
-----------
plugins {
    id 'java'
    id 'maven-publish'
    id 'com.jfrog.bintray' version '1.7.3'
    id 'io.spring.dependency-management' version '1.0.3.RELEASE'
}
signing {
    sign configurations.archives
}
publishing {
    publications {
        "$project.name"(MavenPublication) {
            rootProject.addRequiredMetadata(project, pom)
            pom.withXml {
                def node = asNode().get('dependencyManagement').first().get('dependencies').first()
                rootProject.libs.each {
                    def depNode = new Node(node, 'dependency')
                    depNode.appendNode('groupId', group)
                    depNode.appendNode('artifactId', it)
                    depNode.appendNode('version', version)
                }
                def pomFile = file("${project.buildDir}/generated-pom.xml")
                writeTo(pomFile)
                def pomAscFile = signing.sign(pomFile).signatureFiles[0]
                pomFile.delete()
            }
            artifact('build/generated-pom.xml.asc') {
                classifier = null
                extension = 'pom.asc'
            }
        }
    }
}