/*
 * Copyright ConsenSys AG.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * Check that the licenses of our 3rd parties are in our acceptedLicenses list.
 *
 * run it with "gradle checkLicenses"
 *
 * To add new accepted licenses you need to update this script.
 * Some products may be available with multiple licenses. In this case you must update
 *  this script to add it in the downloadLicenses#licenses.
 */

// Some parts of this code comes from Zipkin/https://github.com/openzipkin/zipkin/pull/852
// Zipkin itself is under Apache License.

/**
 * The lists of the license we accept.
 */
ext.acceptedLicenses = [
    'BSD License',
    'BSD 3-Clause',
    'Eclipse Public License - v 1.0',
    'Eclipse Public License - v 2.0',
    'Eclipse Public License 1.0',
    'MIT License',
    'Apache License, Version 2.0',
    'Bouncy Castle Licence',
    'Public Domain',
    'Mozilla Public License 1.0',
    'Mozilla Public License Version 1.1',
    'Mozilla Public License Version 2.0',
    'CC0 1.0 Universal License',
    'Common Development and Distribution License 1.0',
    'Unicode/ICU License',
    'Public Domain (CC0) License 1.0'
]*.toLowerCase()

/**
 * This is the configuration we need for our licenses plugin: 'com.github.hierynomus.license'
 * This plugin generates a list of dependencies.
 */
downloadLicenses {
  includeProjectDependencies = true
  reportByDependency = false
  reportByLicenseType = true
  dependencyConfiguration = 'testCompile'

  ext.epl1 = license('Eclipse Public License 1.0', 'https://www.eclipse.org/legal/epl-v10.html')
  ext.apache = license('Apache License, Version 2.0', 'http://opensource.org/licenses/Apache-2.0')
  ext.mit = license('MIT License', 'http://www.opensource.org/licenses/mit-license.php')
  ext.bsd = license('BSD License', 'http://www.opensource.org/licenses/bsd-license.php')
  ext.bsd3Clause = license('BSD 3-Clause', 'http://opensource.org/licenses/BSD-3-Clause')
  ext.cddl = license('Common Development and Distribution License 1.0', 'http://opensource.org/licenses/CDDL-1.0')
  ext.cc0 =  license('Public Domain (CC0) License 1.0', 'https://creativecommons.org/publicdomain/zero/1.0')
  aliases = [
      (epl1) : [
          'Eclipse Public License - v 1.0',
          'Eclipse Public License 1.0',
      ],
      (apache)    : [
          'The Apache Software License, Version 2.0',
          'The Apache Software License, version 2.0',
          'The Apache License, Version 2.0',
          'Apache 2',
          'Apache 2.0',
          'Apache License 2.0',
      ],
      (mit)       : [
          'MIT',
          'The MIT License',
      ],
      (bsd)       : [
          'BSD',
          'The BSD License',
      ],
      (bsd3Clause): [
          'BSD 3-Clause',
          'BSD 3-Clause "New" or "Revised" License (BSD-3-Clause)',
          '3-Clause BSD License',
          license('BSD 3-clause', 'http://opensource.org/licenses/BSD-3-Clause'),
          license('BSD 3-Clause', 'http://www.scala-lang.org/license.html')
      ],
      (cddl): [
          'CDDL 1.0',
      ],
      (cc0): [
          'CC0'
      ]
  ]

  licenses = [
      (group('besu'))             : apache,
      (group('besu.ethereum.api')): apache,
      (group('besu.consensus'))   : apache,
      (group('besu.ethereum'))    : apache,
      (group('besu.metrics'))     : apache,
      (group('besu.plugins'))     : apache,
      (group('besu.services'))    : apache,

      // JNA is dual licensed under Apache v2.0 or LGPL 2 licenses
      // Explicitly declare that we are using the Apache v2.0 license
      (group('net.java.dev.jna'))      : apache,

      // RocksDB is dual licensed under Apache v2.0 or GPL 2 licenses
      // Explicitly declare that we are using the Apache v2.0 license
      (group('org.rocksdb'))      : apache,

      // Logback is dual licensed under EPL v1.0 or LGPL v2.1
      // Explicitly declare that we are using the EPL v1.0 license
      (group('ch.qos.logback'))   : epl1,
  ]
}


task checkLicenses {
  description "Verify that all dependencies use white-listed licenses."
  dependsOn ':downloadLicenses'

  def bads = ""
  doLast {
    def xml = new XmlParser().parse("${rootProject.buildDir}/reports/license/license-dependency.xml")
    xml.each { license ->
      if (!acceptedLicenses.contains((license.@name).toLowerCase())) {
        def depStrings = []
        license.dependency.each { depStrings << it.text() }
        bads = bads + depStrings + " =>  ${license.@name} \n"
      }
    }
    if (bads != "") {
      throw new GradleException("Some 3rd parties are using licenses not in our accepted licenses list:\n" +
          bads +
          "If it's a license acceptable for us, add it in the file check-licenses.gradle\n"+
          "Be careful, some 3rd parties may accept multiple licenses.\n" +
          "In this case, select the one you want to use by changing downloadLicenses.licenses\n"
      )
    }
  }
}
check.dependsOn checkLicenses