build.licenses.gradle

// All licenses that we accept, and their aliases
def whitelist = [
        [name: 'BSD-2-Clause', url: 'http://opensource.org/licenses/BSD-2-Clause', aliases: [
                [name: 'BSD-style', url:'http://www.opensource.org/licenses/bsd-license.php'],
        ]],
        [name: 'BSD-3-Clause', url: 'http://opensource.org/licenses/BSD-3-Clause', aliases: [
                [name: 'The BSD 3-Clause License'],
                [name: 'The 3-Clause BSD License'],
                [name: 'BSD 3-Clause'],
                [name: 'BSD 3 Clause'],
                [name: 'BSD 3-clause'],
                [name: 'New BSD License'],
                [name: 'New BSD license'],
                [name: 'The New BSD License'],
                [name: 'BSD License', url: 'http://www.antlr.org/license.html'],
                [name: 'BSD licence', url: 'http://antlr.org/license.html'],
                [name: 'The BSD License', url: 'http://www.antlr.org/license.html'],
                [name: 'BSD', url: 'http://asm.ow2.org/license.html'],
                [name: 'BSD', url: 'http://www.jcraft.com/jsch/LICENSE.txt'],
                [name: 'BSD', url: 'https://github.com/sbt/test-interface/blob/master/LICENSE'],
                [name: 'BSD', url: 'LICENSE.txt'],
                [name: '', url: 'http://asm.ow2.org/license.html'],
        ]],
        [name: 'Apache-2.0', url: 'https://opensource.org/licenses/Apache-2.0', aliases: [
                [name: 'The Apache Software License, Version 2.0'],
                [name: 'The Apache License, Version 2.0'],
                [name: 'Apache 2'],
                [name: 'Apache v2'],
                [name: 'Apache License, Version 2.0'],
                [name: 'Apache License, Version 2'],
                [name: 'Apache Software License - Version 2.0'],
                [name: 'Apache License 2.0'],
                [name: 'Apache License'],
                [name: 'Apache 2.0'],
                [name: 'Apache-2.0'],
                [name: 'Apache 2.0 License'],
                [name: 'ASL'],
                [name: 'ASL 2.0'],
                [name: 'the Apache License, ASL Version 2.0'],
                [name: '', url: 'http://www.apache.org/licenses/LICENSE-2.0.txt'],
        ]],
        [name: 'MIT', url: 'https://opensource.org/licenses/MIT', aliases: [
                [name: 'MIT'],
                [name: 'MIT license'],
                [name: 'MIT License'],
                [name: 'The MIT License'],
                [name: 'Bouncy Castle Licence'],
        ]]
]


subprojects {
    apply plugin: 'base'
    apply plugin: "com.github.hierynomus.license"

    // License header checking and insertion
    license {
        header = rootProject.file("etc/licenses/headers/NOTICE-header.txt")
        // what comment style to use
        mapping {
            scala = 'SLASHSTAR_STYLE'
        }
        // https://github.com/hierynomus/license-gradle-plugin/issues/145
        // exclude 'test/resources/**'
        // exclude 'main/resources/**'
        include '**/*.scala'
        include '**/*.java'
    }

    tasks.check.dependsOn tasks.license

    // Dependency license reporting
    downloadLicenses {

        dependencyConfiguration = 'compile'

        aliases = whitelist.collectEntries { lic ->
            def actual = license(lic.name, lic.url)
            def alternatives = lic.aliases.collect { it.url ? license(it.name, it.url) : it.name }
            [(actual): alternatives]
        }
    }

    tasks.downloadLicenses.outputs.upToDateWhen { false }

    tasks.downloadLicenses.ext.licencesJson = { ->
        def jsonDir = tasks.downloadLicenses.jsonDestination
        def jsonFile = file("$jsonDir/license-dependency.json")
        new groovy.json.JsonSlurper().parseText(jsonFile.text)
    }

    // Dependency license validation
    task validateLicenses {
        group 'license'
        description 'Checks dependency licenses against a whitelist'
        dependsOn tasks.downloadLicenses

        doLast {
            File errFile = file("$tasks.downloadLicenses.jsonDestination/license-errors.txt")
            errFile.text = ""

            tasks.downloadLicenses.licencesJson().licences
                    .findAll { lic -> !whitelist.any { lic.name == it.name } }
                    .sort { lic -> lic.name }
                    .each { lic -> logger.error("The license '$lic.name' is not in the license whitelist. Details: ${lic.toMapString()}") }
                    .each { lic -> errFile << '\n' << lic.toMapString() }
                    .each { lic -> throw new GradleException("The license '$lic.name' is not in the license whitelist") }
        }
    }

    tasks.check.dependsOn tasks.validateLicenses

    // Compound dependency licenses files
    task generateLicensesFiles {
        description 'Generates dependency license report files'
        dependsOn tasks.downloadLicenses

        ext.licensesFile = file("$tasks.downloadLicenses.jsonDestination/LICENSES.txt")
        ext.noticeFile = file("$tasks.downloadLicenses.jsonDestination/NOTICE.txt")

        outputs.file(ext.licensesFile)
        outputs.file(ext.noticeFile)

        doLast {
            licensesFile.createNewFile()
            licensesFile.text = rootProject.file("etc/licenses/headers/LICENSES-header.txt").text

            tasks.downloadLicenses.licencesJson().licences.sort { it.name }.each {
                licensesFile << '\n\n'
                licensesFile << "------------------------------------------------------------------------------\n"
                licensesFile << "$it.name\n"
                it.dependencies.sort { it }.each { licensesFile << "  $it\n" }
                licensesFile << "------------------------------------------------------------------------------\n"
                licensesFile << '\n'
                licensesFile << rootProject.file("etc/licenses/text/$it.name").text
            }

            noticeFile.createNewFile()
            noticeFile.text = rootProject.file("etc/licenses/headers/NOTICE-header.txt").text
            noticeFile << '\n\n'
            noticeFile << "Third-party licenses\n"
            noticeFile << "--------------------\n"

            tasks.downloadLicenses.licencesJson().licences.sort { it.name }.each {
                noticeFile << '\n'
                noticeFile << "$it.name\n"
                it.dependencies.sort { it }.each { noticeFile << "  $it\n" }
            }
        }
    }

    tasks.check.dependsOn tasks.generateLicensesFiles
}

// Disable dependency license validation on test and documentation projects
[
 'flink-cypher',
 'flink-cypher-testing',
// 'flink-cypher-tck'
].each {
    project(it).tasks.validateLicenses.enabled = false
    project(it).tasks.generateLicensesFiles.enabled = false
}