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require 'rack/utils'
module Flipper
module Api
class JsonParams
include Rack::Utils
def initialize(app)
@app = app
end
CONTENT_TYPE = 'CONTENT_TYPE'.freeze
QUERY_STRING = 'QUERY_STRING'.freeze
REQUEST_BODY = 'rack.input'.freeze
# Public: Merge request body params with query string params
# This way can access all params with Rack::Request#params
# Rack does not add application/json params to Rack::Request#params
# Allows app to handle x-www-url-form-encoded / application/json request
# parameters the same way
def call(env)
if env[CONTENT_TYPE] == 'application/json'
body = env[REQUEST_BODY].read
env[REQUEST_BODY].rewind
update_params(env, body)
end
@app.call(env)
end
private
# Rails 3.2.2.1 Rack version does not have Rack::Request#update_param
# Rack 1.5.0 adds update_param
# This method accomplishes similar functionality
def update_params(env, data)
return if data.empty?
parsed_request_body = JSON.parse(data)
parsed_query_string = parse_query(env[QUERY_STRING])
parsed_query_string.merge!(parsed_request_body)
parameters = build_query(parsed_query_string)
env[QUERY_STRING] = parameters
end
end
end
end
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