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# frozen_string_literal: true
require 'json'
module Faraday
class Request
# Request middleware that encodes the body as JSON.
#
# Processes only requests with matching Content-type or those without a type.
# If a request doesn't have a type but has a body, it sets the Content-type
# to JSON MIME-type.
#
# Doesn't try to encode bodies that already are in string form.
class Json < Middleware
MIME_TYPE = 'application/json'
MIME_TYPE_REGEX = %r{^application/(vnd\..+\+)?json$}
def on_request(env)
match_content_type(env) do |data|
env[:body] = encode(data)
end
end
private
def encode(data)
if options[:encoder].is_a?(Array) && options[:encoder].size >= 2
options[:encoder][0].public_send(options[:encoder][1], data)
elsif options[:encoder].respond_to?(:dump)
options[:encoder].dump(data)
else
::JSON.generate(data)
end
end
def match_content_type(env)
return unless process_request?(env)
env[:request_headers][CONTENT_TYPE] ||= MIME_TYPE
yield env[:body] unless env[:body].respond_to?(:to_str)
end
def process_request?(env)
type = request_type(env)
body?(env) && (type.empty? || type.match?(MIME_TYPE_REGEX))
end
def body?(env)
body = env[:body]
case body
when true, false
true
when nil
# NOTE: nil can be converted to `"null"`, but this middleware doesn't process `nil` for the compatibility.
false
else
!(body.respond_to?(:to_str) && body.empty?)
end
end
def request_type(env)
type = env[:request_headers][CONTENT_TYPE].to_s
type = type.split(';', 2).first if type.index(';')
type
end
end
end
end
Faraday::Request.register_middleware(json: Faraday::Request::Json)
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