Ruby で Firebase User を作成

動機

• Firebase Auth を使ったWebアプリの Rails System Spec を書きたい
• フロントエンドで Firebase JavaScript SDK を使っているため、バックエンドでのstubでは書けない

サンプルコード（一部抜粋）

• Google::Apis::IdentitytoolkitV3::IdentityToolkitService Google::Apis::IdentitytoolkitV3::SignupNewUserRequest で作成できる
• メールアドレスは実際に受信するなら MailSlurp あたりを使って用意する

require 'rails_helper'
require 'google/apis/identitytoolkit_v3'

RSpec.feature 'login', type: :system, js: true do
  def sign_in(email, password)
    visit root_path
    within(:css, '#login_modal') do
      fill_in('login_email', with: email)
      fill_in('login_password', with: password)
      find_button('Login', wait: 10).click  # Firebase JavaScript SDK によるメールアドレス認証
    end
    expect(page).to have_button('Logout', wait: 10)
  end

  def sign_out
    find_button('Logout', wait: 10).click
  end

  before do
    # Create Firebase User
    # https://qiita.com/asflash8/items/17775895e35272ae7ec8
    # https://firebase.google.com/docs/auth/admin/manage-users?hl=ja
    firebase_service_account_json_key = Rails.application.credentials.dig(:raw, :firebase_service_account_json_key)
    @identity_toolkit_service = Google::Apis::IdentitytoolkitV3::IdentityToolkitService.new
    @identity_toolkit_service.authorization = Google::Auth::ServiceAccountCredentials.make_creds(
      json_key_io: StringIO.new(firebase_service_account_json_key),
      scope: 'https://www.googleapis.com/auth/identitytoolkit'
    )
    user_data = {
      email: 'test@takeyuweb.co.jp',
      email_verified: true,
      password: 'password1234',
      disabled: false
    }
    request = Google::Apis::IdentitytoolkitV3::SignupNewUserRequest.new(user_data)
    @account = @identity_toolkit_service.signup_new_user(request)

    # Signin
    sign_in(user_data.fetch(:email), user_data.fetch(:password))

    @current_user = User.find_by(email: user_data.fetch(:email))
    @password = user_data.fetch(:password)
  end

  after do
    if @account
      request = Google::Apis::IdentitytoolkitV3::DeleteAccountRequest.new(local_id: @account.local_id)
      @identity_toolkit_service.delete_account(request)
    end
  rescue Google::Apis::ClientError => e
    Rails.logger.error(e.message)
  end

  scenario "edit profile" do
    visit root_path
    find_link('Profile').click

    expect(page).to have_field('Name')
    expect(page).to have_field('Telephone')

    fill_in 'Name', with: 'Yuichi Takeuchi'
    fill_in 'Telephone', with: '81487003094'

    # (snip)
  end
end

参考

qiita.com

firebase.google.com