Class: Rack::NestedParams

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

Overview

Rack middleware for parsing POST/PUT body data into nested parameters

Defined Under Namespace

Classes: UrlEncodedPairParser

Constant Summary collapse

CONTENT_TYPE = 
'CONTENT_TYPE'.freeze
POST_BODY = 
'rack.input'.freeze
FORM_INPUT = 
'rack.request.form_input'.freeze
FORM_HASH = 
'rack.request.form_hash'.freeze
FORM_VARS = 
'rack.request.form_vars'.freeze
URL_ENCODED =

supported content type

'application/x-www-form-urlencoded'.freeze

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ NestedParams

Returns a new instance of NestedParams.



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# File 'lib/rack/contrib/nested_params.rb', line 17

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/contrib/nested_params.rb', line 21

def call(env)
  if form_vars = env[FORM_VARS]
    env[FORM_HASH] = parse_query_parameters(form_vars)
  elsif env[CONTENT_TYPE] == URL_ENCODED
    post_body = env[POST_BODY]
    env[FORM_INPUT] = post_body
    env[FORM_HASH] = parse_query_parameters(post_body.read)
    post_body.rewind if post_body.respond_to?(:rewind)
  end
  @app.call(env)
end

#parse_query_parameters(query_string) ⇒ Object

the rest is nabbed from Rails ##



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# File 'lib/rack/contrib/nested_params.rb', line 35

def parse_query_parameters(query_string)
  return {} if query_string.nil? or query_string.empty?

  pairs = query_string.split('&').collect do |chunk|
    next if chunk.empty?
    key, value = chunk.split('=', 2)
    next if key.empty?
    value = value.nil? ? nil : CGI.unescape(value)
    [ CGI.unescape(key), value ]
  end.compact

  UrlEncodedPairParser.new(pairs).result
end