Class: Rack::WWWhisper::NoPublicCache

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/wwwhisper.rb

Overview

An internal middleware used by Rack::WWWhisper to change directives that enable public caching into directives that enable private caching.

To be on a safe side, all wwwhisper protected content is treated as sensitive and not publicly cacheable.

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ NoPublicCache

Returns a new instance of NoPublicCache.



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# File 'lib/rack/wwwhisper.rb', line 289

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object

If a response enables caching, makes sure it is private.



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# File 'lib/rack/wwwhisper.rb', line 294

def call(env)
  status, headers, body = @app.call(env)
  if cache_control = headers['Cache-Control']
    cache_control = cache_control.gsub(/public/, 'private')
    if (not cache_control.include? 'private' and
        cache_control.index(/max-age\s*=\s*0*[1-9]/))
      # max-age > 0 without 'public' or 'private' directive is
      # treated as 'public', so 'private' needs to be prepended.
      cache_control.insert(0, 'private, ')
    end
    headers['Cache-Control'] = cache_control
  end
  [status, headers, body]
end