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Contents
=begin
Conditionally use Rack Middleware.
Usage:
condition_proc = ->(env) { env['PATH_INFO'] == '/match' }
use_when condition_proc, SomeMiddleware, options
I feel sure there must be something like this officially supported somewhere, but I can't find it.
=end
module Rack
module PactBroker
module UseWhen
class ConditionallyUseMiddleware
def initialize(app, condition_proc, middleware, *args, &block)
@app_without_middleware = app
@condition_proc = condition_proc
@middleware = middleware
@args = args
@block = block
end
def call(env)
if condition_proc.call(env)
app_with_middleware.call(env)
else
app_without_middleware.call(env)
end
end
private
attr_reader :app_without_middleware, :condition_proc, :middleware, :args, :block
def app_with_middleware
@app_with_middleware ||= begin
rack_builder = ::Rack::Builder.new
rack_builder.use middleware, *args, &block
rack_builder.run app_without_middleware
rack_builder.to_app
end
end
end
refine Rack::Builder do
def use_when(condition_proc, middleware, *args, &block)
use(ConditionallyUseMiddleware, condition_proc, middleware, *args, &block)
end
end
end
end
end
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70 entries across 70 versions & 1 rubygems