Shrine验证文件扩展名不允许使用Facebook图像

require "shrine"
require "shrine/storage/file_system"

# 配置Shrine使用文件系统存储
Shrine.storages[:file_system] = Shrine::Storage::FileSystem.new("public", prefix: "uploads")

# 创建Shrine的上传器
class MyUploader < Shrine
  plugin :validation_helpers

  Attacher.validate do
    validate_extension_inclusion %w[jpg jpeg png gif]
  end
end

# 实例化上传器
uploader = MyUploader.new(:file_system)

# 上传文件
file = File.open("path/to/file.jpg", "rb")
uploaded_file = uploader.upload(file)

# 检查文件扩展名是否符合要求
if uploaded_file.valid?
  puts "文件上传成功！"
else
  puts "文件扩展名不允许使用Facebook图像。"
end