/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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
 */


import org.elasticsearch.gradle.LoggedExec
import org.elasticsearch.gradle.MavenFilteringHack

import java.nio.file.Files
import java.nio.file.Path
import java.util.regex.Matcher
import java.util.regex.Pattern

/*****************************************************************************
 *                         Deb and rpm configuration                         *
 *****************************************************************************
 *
 * The general strategy here is to build a directory on disk that contains
 * stuff that needs to be copied into the distributions. This is
 * important for two reasons:
 * 1. ospackage wants to copy the directory permissions that it sees off of the
 *    filesystem. If you ask it to create a directory that doesn't already
 *    exist on disk it petulantly creates it with 0755 permissions, no matter
 *    how hard you try to convince it otherwise.
 * 2. Convincing ospackage to pick up an empty directory as part of a set of
 *    directories on disk is reasonably easy. Convincing it to just create an
 *    empty directory requires more wits than I have.
 * 3. ospackage really wants to suck up some of the debian control scripts
 *    directly from the filesystem. It doesn't want to process them through
 *    MavenFilteringHack or any other copy-style action.
 *
 * The following commands are useful when it comes to check the user/group
 * and files permissions set within the RPM and DEB packages:
 *
 *    rpm -qlp --dump path/to/elasticsearch.rpm
 *    dpkg -c path/to/elasticsearch.deb
 */

buildscript {
  repositories {
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }
  dependencies {
    classpath 'com.netflix.nebula:gradle-ospackage-plugin:4.7.1'
  }
}

void addProcessFilesTask(String type, boolean oss) {
  String packagingFiles = "build/packaging/${ oss ? 'oss-' : ''}${type}"

  task("process${oss ? 'Oss' : ''}${type.capitalize()}Files", type: Copy) {
    into packagingFiles

    with copySpec {
      from 'src/common'
      from "src/${type}"
      MavenFilteringHack.filter(it, expansionsForDistribution(type, oss))
    }

    into('config') {
      with configFiles(type, oss)
    }
    MavenFilteringHack.filter(it, expansionsForDistribution(type, oss))

    doLast {
      // create empty dirs, we set the permissions when configuring the packages
      mkdir "${packagingFiles}/var/run/elasticsearch"
      mkdir "${packagingFiles}/var/log/elasticsearch"
      mkdir "${packagingFiles}/var/lib/elasticsearch"
      mkdir "${packagingFiles}/usr/share/elasticsearch/plugins"
    }
  }
}
addProcessFilesTask('deb', true)
addProcessFilesTask('deb', false)
addProcessFilesTask('rpm', true)
addProcessFilesTask('rpm', false)

// Common configuration that is package dependent. This can't go in ospackage
// since we have different templated files that need to be consumed, but the structure
// is the same
Closure commonPackageConfig(String type, boolean oss) {
  return {
    dependsOn "process${oss ? 'Oss' : ''}${type.capitalize()}Files"
    packageName "elasticsearch${oss ? '-oss' : ''}"
    // Follow elasticsearch's file naming convention
    archiveName "${packageName}-${project.version}.${type}"

    String prefix = "${oss ? 'oss-' : ''}${type}"
    destinationDir = file("${prefix}/build/distributions")
    String packagingFiles = "build/packaging/${prefix}"

    String scripts = "${packagingFiles}/scripts"
    preInstall file("${scripts}/preinst")
    postInstall file("${scripts}/postinst")
    preUninstall file("${scripts}/prerm")
    postUninstall file("${scripts}/postrm")
    if (type == 'rpm') {
      postTrans file("${scripts}/posttrans")
    }

    // top level "into" directive is not inherited from ospackage for some reason, so we must
    // specify it again explicitly for copying common files
    into('/usr/share/elasticsearch') {
      into('bin') {
        with binFiles(type, oss)
      }
      from(rootProject.projectDir) {
        include 'README.textile'
      }
      into('modules') {
        with copySpec {
          with modulesFiles(oss)
          // we need to specify every intermediate directory, but modules could have sub directories
          // and there might not be any files as direct children of intermediates (eg platform)
          // so we must iterate through the parents, but duplicate calls with the same path
          // are ok (they don't show up in the built packages)
          eachFile { FileCopyDetails fcp ->
            String[] segments = fcp.relativePath.segments
            for (int i = segments.length - 2; i > 0 && segments[i] != 'modules'; --i) {
              directory('/' + segments[0..i].join('/'), 0755)
            }
          }
        }
      }
    }

    // license files
    if (type == 'deb') {
      into("/usr/share/doc/${packageName}") {
        from "${packagingFiles}/copyright"
        fileMode 0644
      }
    } else {
      assert type == 'rpm'
      into('/usr/share/elasticsearch') {
        from(rootProject.file('licenses')) {
          include oss ? 'APACHE-LICENSE-2.0.txt' : 'ELASTIC-LICENSE.txt'
          rename { 'LICENSE.txt' }
        }
      }
    }

    // ========= config files =========
    configurationFile '/etc/elasticsearch/elasticsearch.yml'
    configurationFile '/etc/elasticsearch/jvm.options'
    configurationFile '/etc/elasticsearch/log4j2.properties'
    into('/etc/elasticsearch') {
      dirMode 0750
      fileMode 0660
      permissionGroup 'elasticsearch'
      includeEmptyDirs true
      createDirectoryEntry true
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/config"
    }
    String envFile = expansionsForDistribution(type, false)['path.env']
    configurationFile envFile
    into(new File(envFile).getParent()) {
      fileType CONFIG | NOREPLACE
      fileMode 0660
      from "${packagingFiles}/env/elasticsearch"
    }

    // ========= systemd =========
    into('/usr/lib/tmpfiles.d') {
      from "${packagingFiles}/systemd/elasticsearch.conf"
    }
    into('/usr/lib/systemd/system') {
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/systemd/elasticsearch.service"
    }
    into('/usr/lib/sysctl.d') {
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/systemd/sysctl/elasticsearch.conf"
    }

    // ========= sysV init =========
    configurationFile '/etc/init.d/elasticsearch'
    into('/etc/init.d') {
      fileMode 0750
      fileType CONFIG | NOREPLACE
      from "${packagingFiles}/init.d/elasticsearch"
    }

    // ========= empty dirs =========
    // NOTE: these are created under packagingFiles as empty, but the permissions are set here
    Closure copyEmptyDir = { path, u, g, mode ->
      File file = new File(path)
      into(file.parent) {
        from "${packagingFiles}/${file.parent}"
        include file.name
        includeEmptyDirs true
        createDirectoryEntry true
        user u
        permissionGroup g
        dirMode mode
      }
    }
    copyEmptyDir('/var/run/elasticsearch', 'elasticsearch', 'elasticsearch', 0755)
    copyEmptyDir('/var/log/elasticsearch', 'elasticsearch', 'elasticsearch', 0750)
    copyEmptyDir('/var/lib/elasticsearch', 'elasticsearch', 'elasticsearch', 0750)
    copyEmptyDir('/usr/share/elasticsearch/plugins', 'root', 'root', 0755)

    // the oss package conflicts with the default distribution and vice versa
    conflicts('elasticsearch' + (oss ? '' : '-oss'))
  }
}

apply plugin: 'nebula.ospackage-base'

// this is package indepdendent configuration
ospackage {
  maintainer 'Elasticsearch Team <info@elastic.co>'
  summary '''
    Elasticsearch is a distributed RESTful search engine built for the cloud.
    Reference documentation can be found at
    https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html
    and the 'Elasticsearch: The Definitive Guide' book can be found at
    https://www.elastic.co/guide/en/elasticsearch/guide/current/index.html
    '''.stripIndent().replace('\n', ' ').trim()
  url 'https://www.elastic.co/'

  // signing setup
  if (project.hasProperty('signing.password') && System.getProperty('build.snapshot', 'true') == 'false') {
    signingKeyId = project.hasProperty('signing.keyId') ? project.property('signing.keyId') : 'D88E42B4'
    signingKeyPassphrase = project.property('signing.password')
    signingKeyRingFile = project.hasProperty('signing.secretKeyRingFile') ?
                         project.file(project.property('signing.secretKeyRingFile')) :
                         new File(new File(System.getProperty('user.home'), '.gnupg'), 'secring.gpg')
  }

  requires('coreutils')

  fileMode 0644
  dirMode 0755
  user 'root'
  permissionGroup 'root'

  into '/usr/share/elasticsearch'
  with libFiles
  with noticeFile
}

Closure commonDebConfig(boolean oss) {
  return {
    configure(commonPackageConfig('deb', oss))

    // jdeb does not provide a way to set the License control attribute, and ospackage
    // silently ignores setting it. Instead, we set the license as "custom field"
    if (oss) {
      customFields['License'] = 'ASL-2.0'
    } else {
      customFields['License'] = 'Elastic-License'
    }

    version = project.version.replace('-', '~')
    packageGroup 'web'
    requires 'bash'
    requires 'libc6'
    requires 'adduser'

    into('/usr/share/lintian/overrides') {
      from('src/deb/lintian/elasticsearch')
    }
  }
}

task buildDeb(type: Deb) {
  configure(commonDebConfig(false))
}

task buildOssDeb(type: Deb) {
  configure(commonDebConfig(true))
}

Closure commonRpmConfig(boolean oss) {
  return {
    configure(commonPackageConfig('rpm', oss))

    if (oss) {
      license 'ASL 2.0'
    } else {
      license 'Elastic License'
    }

    packageGroup 'Application/Internet'
    requires '/bin/bash'

    prefix '/usr'
    packager 'Elasticsearch'
    version = project.version.replace('-', '_')
    release = '1'
    arch 'NOARCH'
    os 'LINUX'
    distribution 'Elasticsearch'
    vendor 'Elasticsearch'
    // TODO ospackage doesn't support icon but we used to have one

    // without this the rpm will have parent dirs of any files we copy in, eg /etc/elasticsearch
    addParentDirs false

    // Declare the folders so that the RPM package manager removes
    // them when upgrading or removing the package
    directory('/usr/share/elasticsearch/bin', 0755)
    directory('/usr/share/elasticsearch/lib', 0755)
    directory('/usr/share/elasticsearch/modules', 0755)
  }
}

task buildRpm(type: Rpm) {
  configure(commonRpmConfig(false))
}

task buildOssRpm(type: Rpm) {
  configure(commonRpmConfig(true))
}

Closure dpkgExists = { it -> new File('/bin/dpkg-deb').exists() || new File('/usr/bin/dpkg-deb').exists() || new File('/usr/local/bin/dpkg-deb').exists() }
Closure rpmExists = { it -> new File('/bin/rpm').exists() || new File('/usr/bin/rpm').exists() || new File('/usr/local/bin/rpm').exists() }

Closure debFilter = { f -> f.name.endsWith('.deb') }

// This configures the default artifact for the distribution specific
// subprojects. We have subprojects because Gradle project substitutions
// can only bind to the default configuration of a project
subprojects {
  apply plugin: 'distribution'

  String buildTask = "build${it.name.replaceAll(/-[a-z]/) { it.substring(1).toUpperCase() }.capitalize()}"
  ext.buildDist = parent.tasks.getByName(buildTask)
  artifacts {
    'default' buildDist
  }

  // sanity checks if packages can be extracted
  final File extractionDir = new File(buildDir, 'extracted')
  final File packageExtractionDir
  if (project.name.contains('deb')) {
    packageExtractionDir = new File(extractionDir, 'deb-extracted')
  } else {
    assert project.name.contains('rpm')
    packageExtractionDir = new File(extractionDir, 'rpm-extracted')
  }
  task checkExtraction(type: LoggedExec) {
    dependsOn buildDist
    doFirst {
      project.delete(extractionDir)
      extractionDir.mkdirs()
    }
  }
  check.dependsOn checkExtraction
  if (project.name.contains('deb')) {
    checkExtraction {
      onlyIf dpkgExists
      commandLine 'dpkg-deb', '-x', "${-> buildDist.outputs.files.filter(debFilter).singleFile}", packageExtractionDir
    }
  } else {
    assert project.name.contains('rpm')
    checkExtraction {
      onlyIf rpmExists
      final File rpmDatabase = new File(extractionDir, 'rpm-database')
      commandLine 'rpm',
          '--badreloc',
          '--nodeps',
          '--noscripts',
          '--notriggers',
          '--dbpath',
          rpmDatabase,
          '--relocate',
          "/=${packageExtractionDir}",
          '-i',
          "${-> buildDist.outputs.files.singleFile}"
    }
  }

  task checkLicense {
    dependsOn buildDist, checkExtraction
  }
  check.dependsOn checkLicense
  if (project.name.contains('deb')) {
    checkLicense {
      onlyIf dpkgExists
      doLast {
        final Path copyrightPath
        final String expectedLicense
        final String licenseFilename
        if (project.name.contains('oss-')) {
          copyrightPath = packageExtractionDir.toPath().resolve("usr/share/doc/elasticsearch-oss/copyright")
          expectedLicense = "ASL-2.0"
          licenseFilename = "APACHE-LICENSE-2.0.txt"
        } else {
          copyrightPath = packageExtractionDir.toPath().resolve("usr/share/doc/elasticsearch/copyright")
          expectedLicense = "Elastic-License"
          licenseFilename = "ELASTIC-LICENSE.txt"
        }
        final List<String> header = Arrays.asList("Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/",
                "Copyright: Elasticsearch B.V. <info@elastic.co>",
                "License: " + expectedLicense)
        final List<String> licenseLines = Files.readAllLines(rootDir.toPath().resolve("licenses/" + licenseFilename))
        final List<String> expectedLines = header + licenseLines.collect { " " + it }
        assertLinesInFile(copyrightPath, expectedLines)
      }
    }
  } else {
    assert project.name.contains('rpm')
    checkLicense {
      onlyIf rpmExists
      doLast {
        final String licenseFilename
        if (project.name.contains('oss-')) {
          licenseFilename = "APACHE-LICENSE-2.0.txt"
        } else {
          licenseFilename = "ELASTIC-LICENSE.txt"
        }
        final List<String> licenseLines = Files.readAllLines(rootDir.toPath().resolve("licenses/" + licenseFilename))
        final Path licensePath = packageExtractionDir.toPath().resolve("usr/share/elasticsearch/LICENSE.txt")
        assertLinesInFile(licensePath, licenseLines)
      }
    }
  }

  task checkNotice {
    dependsOn buildDist, checkExtraction
    onlyIf { (project.name.contains('deb') && dpkgExists.call(it)) || (project.name.contains('rpm') && rpmExists.call(it)) }
    doLast {
      final List<String> noticeLines = Arrays.asList("Elasticsearch", "Copyright 2009-2018 Elasticsearch")
      final Path noticePath = packageExtractionDir.toPath().resolve("usr/share/elasticsearch/NOTICE.txt")
      assertLinesInFile(noticePath, noticeLines)
    }
  }
  check.dependsOn checkNotice

  task checkLicenseMetadata(type: LoggedExec) {
    dependsOn buildDist, checkExtraction
  }
  check.dependsOn checkLicenseMetadata
  if (project.name.contains('deb')) {
    checkLicenseMetadata { LoggedExec exec ->
      onlyIf dpkgExists
      final ByteArrayOutputStream output = new ByteArrayOutputStream()
      exec.commandLine 'dpkg-deb', '--info', "${ -> buildDist.outputs.files.filter(debFilter).singleFile}"
      exec.standardOutput = output
      doLast {
        final String expectedLicense
        if (project.name.contains('oss-')) {
          expectedLicense = "ASL-2.0"
        } else {
          expectedLicense = "Elastic-License"
        }
        final Pattern pattern = Pattern.compile("\\s*License: (.+)")
        final String info = output.toString('UTF-8')
        final String[] actualLines = info.split("\n")
        int count = 0
        for (final String actualLine : actualLines) {
          final Matcher matcher = pattern.matcher(actualLine)
          if (matcher.matches()) {
            count++
            final String actualLicense = matcher.group(1)
            if (expectedLicense != actualLicense) {
              throw new GradleException("expected license [${expectedLicense} for package info but found [${actualLicense}]")
            }
          }
        }
        if (count == 0) {
          throw new GradleException("expected license [${expectedLicense}] for package info but found none in:\n${info}")
        }
        if (count > 1) {
          throw new GradleException("expected a single license for package info but found [${count}] in:\n${info}")
        }
      }
    }
  } else {
    assert project.name.contains('rpm')
    checkLicenseMetadata { LoggedExec exec ->
      onlyIf rpmExists
      final ByteArrayOutputStream output = new ByteArrayOutputStream()
      exec.commandLine 'rpm', '-qp', '--queryformat', '%{License}', "${-> buildDist.outputs.files.singleFile}"
      exec.standardOutput = output
      doLast {
        final String license = output.toString('UTF-8')
        final String expectedLicense
        if (project.name.contains('oss-')) {
          expectedLicense = "ASL 2.0"
        } else {
          expectedLicense = "Elastic License"
        }
        if (license != expectedLicense) {
          throw new GradleException("expected license [${expectedLicense}] for [${-> buildDist.outputs.files.singleFile}] but was [${license}]")
        }
      }
    }
  }

}