COTOHA でキーワードの抽出 (Ruby)

#! /usr/bin/ruby
# -*- encoding: utf-8 -*-
#
#   key_word.rb
#
#                   Feb/27/2020
#
# ---------------------------------------------------------------------
require 'faraday'
require 'json'
#
load 'get_config.rb'
load 'get_token.rb'
# ---------------------------------------------------------------------
def read_string_proc (file_in)
#
    str_out=""
    File.open(file_in,"r:UTF-8") do |ff|
        while line=ff.gets
            str_out += line
        end
    end
#
    return  str_out
end
# ---------------------------------------------------------------------
STDERR.puts "*** 開始 ***"
#
file_in = ARGV[0]
puts file_in
doc = read_string_proc (file_in)
#
config = get_config_proc()
#
access_token = get_token_proc(config)
#   
#
headers={
    "Content-Type": "application/json",
    "Authorization": "Bearer " + access_token
    }
#
data = {
    "document": doc,
    "type": "default"
    }

str_json = JSON.generate(data)
#
url = config['url_base'] + "v1/keyword"
#
con = Faraday.new 
res = con.post do |req|
    req.url url
    req.headers = headers
    req.body = str_json
    end
#
    puts res.status
    dict_aa=JSON.parse(res.body)
#
    dict_aa['result'].each {|unit|
        str_out = unit['form'] + "\t" + unit['score'].to_s
        puts str_out
    }
#
STDERR.puts "*** 終了 ***"
# ---------------------------------------------------------------------

$ ./key_word.rb akai_rousoku.txt
*** 開始 ***
akai_rousoku.txt
200
猿 135.52966
蝋燭  83.9601
花火  78.08584
亀 43.078
火 42.81965
*** 終了 ***