common.sh

#!/usr/bin/env bash

export DEFAULT_MAVEN_VERSION="3.6.2"
export BUILDPACK_STDLIB_URL="https://lang-common.s3.amazonaws.com/buildpack-stdlib/v7/stdlib.sh"

install_maven() {
  local installDir=$1
  local buildDir=$2
  mavenHome=$installDir/.maven

  definedMavenVersion=$(detect_maven_version $buildDir)

  mavenVersion=${definedMavenVersion:-$DEFAULT_MAVEN_VERSION}
  mcount "mvn.version.${mavenVersion}"

  status_pending "Installing Maven ${mavenVersion}"
  local mavenUrl="https://lang-jvm.s3.amazonaws.com/maven-${mavenVersion}.tar.gz"
  if is_supported_maven_version "${mavenVersion}" "${mavenUrl}"; then
    download_maven "${mavenUrl}" "${installDir}" "${mavenHome}"
    status_done
  else
    error_return "Error, you have defined an unsupported Maven version in the system.properties file.
The default supported version is ${DEFAULT_MAVEN_VERSION}"
    return 1
  fi
}

download_maven() {
  local mavenUrl=$1
  local installDir=$2
  local mavenHome=$3
  rm -rf $mavenHome
  curl --retry 3 --silent --max-time 60 --location "${mavenUrl}" | tar xzm -C $installDir
  chmod +x $mavenHome/bin/mvn
}

is_supported_maven_version() {
  local mavenVersion=${1}
  local mavenUrl=${2:?}
  if [ "$mavenVersion" = "$DEFAULT_MAVEN_VERSION" ]; then
    return 0
  elif curl -I --retry 3 --fail --silent --max-time 5 --location "${mavenUrl}" > /dev/null; then
    return 0
  else
    return 1
  fi
}

detect_maven_version() {
  local baseDir=${1}
  if [ -f ${baseDir}/system.properties ]; then
    mavenVersion=$(get_app_system_value ${baseDir}/system.properties "maven.version")
    if [ -n "$mavenVersion" ]; then
      echo $mavenVersion
    else
      echo ""
    fi
  else
    echo ""
  fi
}

get_app_system_value() {
  local file=${1?"No file specified"}
  local key=${2?"No key specified"}

  # escape for regex
  local escaped_key=$(echo $key | sed "s/\./\\\./g")

  [ -f $file ] && \
  grep -E ^$escaped_key[[:space:]=]+ $file | \
  sed -E -e "s/$escaped_key([\ \t]*=[\ \t]*|[\ \t]+)([A-Za-z0-9\.-]*).*/\2/g"
}

cache_copy() {
  rel_dir=$1
  from_dir=$2
  to_dir=$3
  rm -rf "${to_dir:?}/${rel_dir:?}"
  if [ -d $from_dir/$rel_dir ]; then
    mkdir -p $to_dir/$rel_dir
    cp -pr $from_dir/$rel_dir/. $to_dir/$rel_dir
  fi
}

install_jdk() {
  local install_dir=${1}
  local cache_dir=${2}

  let start=$(nowms)
  JVM_COMMON_BUILDPACK=${JVM_COMMON_BUILDPACK:-https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/jvm.tgz}
  mkdir -p /tmp/jvm-common
  curl --retry 3 --silent --location $JVM_COMMON_BUILDPACK | tar xzm -C /tmp/jvm-common --strip-components=1
  source /tmp/jvm-common/bin/util
  source /tmp/jvm-common/bin/java
  source /tmp/jvm-common/opt/jdbc.sh
  mtime "jvm-common.install.time" "${start}"

  let start=$(nowms)
  install_java_with_overlay "${install_dir}" "${cache_dir}"
  mtime "jvm.install.time" "${start}"
}