在运行时为omniauth-shopify-oauth2 gem 切换提供程序？

Question

omniauth-shopify-oauth2 gem 的初始化程序应该如下所示：

# config/initializers/omniauth.rb
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :shopify, ENV['SHOPIFY_API_KEY'], ENV['SHOPIFY_SHARED_SECRET']
end

但是，在我们的 Rails 应用中，有几个不同的品牌提供相同的功能。在整个应用程序中，请求的request.domain 决定了您所接触的品牌（brand1.example.com、brand2.example.com 等）。

我们可以轻松存储品牌特定的凭据并将用户重定向到品牌特定的授权路径：

https://example.myshopify.com/admin/oauth/authorize?client_id=brand1&scope=read_orders,read_products&redirect_uri=https://brand1.example.com/auth/shopify/callback

但我不知道如何根据访问过的request.domain 选择不同的中间件提供商。知道如何设置吗？

Answer 1

Omniauth 提供有关 Dynamic Providers 的文档，这将在此处有所帮助。比如：

# config/initializers/omniauth.rb
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :shopify, setup: lambda do |env|

    # Do logic to get correct credentials for request.
    # For example, if you store the credentials on a model called Brand,
    # and have it keyed on "subdomain":
    request = ActionDispatch::Request.new(env)
    brand = Brand.find_by(subdomain: request.subdomain)

    env['omniauth.strategy'].options.merge!({
      client_id: brand.client_id,
      client_secret: brand.client_secret
    })

    # `site` needs to be set. This is part of the shopify provider setup phase, which we are overriding
    env['omniauth.strategy'].options[:client_options][:site] = "https://#{ request.GET['shop'] }"
  end
end