#!/bin/bash

set -euo pipefail

OWNER_HANDLE="gitlab_rubygems"

error() {
  echo "ERROR:" "$@"
  exit 1
}

warn() {
  echo "WARNING:" "$@"
}

validate_gem() {
  validate_existence "$1"
  validate_owners "$1"
  validate_content "$1"
}

validate_existence() {
  if gem specification --quiet --silent --remote --ruby "$1"; then
    return 0
  fi

  if gem specification --quiet --silent --remote --ruby --pre "$1"; then
    return 0
  fi

  error "The '$1' is missing. Push stub gem to RubyGems with version 0.0.0. See https://docs.gitlab.com/ee/development/gems.html#reserve-a-gem-name"
}

validate_owners() {
  if ! curl --silent --fail "https://rubygems.org/api/v1/gems/$1/owners.json" | grep --silent "\"handle\":\"$OWNER_HANDLE\""; then
    error "Gem '$1' does not contain '$OWNER_HANDLE' as owner."
  fi
}

validate_content() {
  local tmpdir
  tmpdir=$(mktemp --directory)
  gem unpack "$1" --quiet --silent --target "$tmpdir"

  if ! grep --silent --recursive --perl-regexp '^\s*raise "Reserved for GitLab"$' "$tmpdir"; then
    warn "Contents of gem '$1' does not contain 'raise \"Reserved for GitLab\"'."
  fi
}

if [[ $# -ne 1 ]]; then
  error "usage: $0 <gem-name>"
fi

echo "Validating gem '$1'"

validate_gem "$1"
echo "SUCCESS!"