lib/saddle/middleware/request/url_encoded.rb
require 'faraday'
module Saddle
module Middleware
module Request
# This magically handles converting your body from a hash
# into an url-encoded (or multipart if needed) request
# Make sure you set request[:request_style] = :urlencoded
# for it to be activated.
class UrlEncoded < Faraday::Middleware
CONTENT_TYPE = 'Content-Type'.freeze unless defined? CONTENT_TYPE
URL_ENCODED_MIME_TYPE = 'application/x-www-form-urlencoded'.freeze
MULTIPART_MIME_TYPE = 'multipart/form-data'.freeze
VALID_MIME_TYPES = [URL_ENCODED_MIME_TYPE, MULTIPART_MIME_TYPE]
DEFAULT_MULTIPART_BOUNDARY = "-^---_---^-".freeze
def call(env)
if env[:saddle][:request_style] == :urlencoded
# Make sure we're working with a valid body that's not a String
if env[:body] and !env[:body].respond_to?(:to_str)
if has_multipart?(env[:body])
env[:request][:boundary] ||= DEFAULT_MULTIPART_BOUNDARY
env[:request_headers][CONTENT_TYPE] ||= MULTIPART_MIME_TYPE
env[:request_headers][CONTENT_TYPE] += ";boundary=#{env[:request][:boundary]}"
env[:body] = create_multipart(env, env[:body])
else
env[:request_headers][CONTENT_TYPE] ||= URL_ENCODED_MIME_TYPE
env[:body] = Faraday::Utils::ParamsHash[env[:body]].to_query
end
end
end
@app.call env
end
private
def has_multipart?(obj)
# string is an enum in 1.8, returning list of itself
if obj.respond_to?(:each) && !obj.is_a?(String)
(obj.respond_to?(:values) ? obj.values : obj).each do |val|
return true if (val.respond_to?(:content_type) || has_multipart?(val))
end
end
false
end
def create_multipart(env, params)
boundary = env[:request][:boundary]
parts = process_params(params) do |key, value|
Faraday::Parts::Part.new(boundary, key, value)
end
parts << Faraday::Parts::EpiloguePart.new(boundary)
body = Faraday::CompositeReadIO.new(parts)
env[:request_headers][Faraday::Env::ContentLength] = body.length.to_s
body
end
def process_params(params, prefix = nil, pieces = nil, &block)
params.inject(pieces || []) do |all, (key, value)|
key = "#{prefix}[#{key}]" if prefix
case value
when Array
values = value.inject([]) { |a,v| a << [nil, v] }
process_params(values, key, all, &block)
when Hash
process_params(value, key, all, &block)
else
all << block.call(key, value)
end
end
end
end
end
end
end