机架URL映射 [英] Rack URL Mapping

问题描述

我正在尝试编写两种Rack路由。机架允许我们这样写这样的路由：

I am trying to write two kind of Rack routes. Rack allow us to write such routes like so:

app = Rack::URLMap.new('/test'  => SimpleAdapter.new,
                       '/files' => Rack::File.new('.'))

对于我来说，我想处理以下路线：

In my case, I would like to handle those routes:

• /或 index


• / *以匹配任何其他路线

所以我尝试了以下方法：

So I had trying this:

app = Rack::URLMap.new('/index' => SimpleAdapter.new,
                       '/'      => Rack::File.new('./public'))

这很好，但是...我不知道如何添加 /路径（作为 / index路径的替代方式）。根据我的测试，路径 / *不解释为通配符。

This works well, but... I don't know how to add '/' path (as alternative of '/index' path). The path '/*' is not interpreted as a wildcard, according to my tests. Do you know how I could do?

谢谢

推荐答案

您是正确的，因为 Rack :: URLMap 不会将路径中的'*'视为通配符。从路径到正则表达式的实际翻译看起来像这样：

You are correct that Rack::URLMap doesn't treat '*' in a path as a wildcard. The actual translation from path to regular expression looks like this:

Regexp.new("^#{Regexp.quote(location).gsub('/', '/+')}(.*)", nil, 'n')

也就是说，它将路径中的任何字符视为文字，但还会匹配具有任何后缀的路径。我相信您要完成所要完成的唯一方法就是使用中间件而不是端点。在您的 config.ru 中，您可能会有类似的内容：

That is, it treats any characters in the path as literals, but also matches a path with any suffix. I believe the only way for you to accomplish what you're attempting is to use a middleware instead of an endpoint. In your config.ru you might have something like this:

use SimpleAdapter
run Rack::File

和您的 lib / simple_adapter .rb 可能看起来像这样：

And your lib/simple_adapter.rb might look something like this:

class SimpleAdapter
  SLASH_OR_INDEX = %r{/(?:index)?}
  def initialize(app)
    @app = app
  end
  def call(env)
    request = Rack::Request.new(env)
    if request.path =~ SLASH_OR_INDEX
      # return some Rack response triple...
    else
      # pass the request on down the stack:
      @app.call(env)
    end
  end
end

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