Simple Ruby script to convert HAR files into CSV files

har2csv.rb

#! /usr/bin/env ruby
require 'oj'
require 'csv'
require 'uri'

unless ARGV.size == 2
  puts 'USAGE:'
  puts "\t har2csv.rb har_filename csv_filename"
  exit 0
end

har_filename = ARGV.first
csv_filename = ARGV.last

har = Oj.load_file(har_filename, symbol_keys: true)

def mime2 mime
  s = mime.split('/')
  if s.first == 'image'
    s.first
  else
    s.last
  end
end

def max *values
  values.map {|v| v || 0.0}.max
end

csv_string = CSV.generate do |csv|
  # CSV header
  csv << %w(
    time
    method
    hostname
    path
    status
    num_cookies
    size
    compression
    downloaded
    mimeType
    mime2
    t_blocked
    t_dns
    t_connect
    t_send
    t_wait
    t_receive
    t_ssl
  )
  # CSV body
  har[:log][:entries].each do |entry|
    uri = URI(entry[:request][:url])
    csv << [
      entry[:time],
      entry[:request][:method],
      uri.hostname,
      uri.path,
      entry[:response][:status],
      entry[:response][:cookies].size,
      size = entry[:response][:content][:size],
      compression = entry[:response][:content][:compression] || 0,
      max(size - compression, 0.0),
      mime = entry[:response][:content][:mimeType],
      mime2(mime),
      max(entry[:timings][:blocked], 0.0),
      max(entry[:timings][:dns], 0.0),
      max(entry[:timings][:connect], 0.0),
      max(entry[:timings][:send], 0.0),
      max(entry[:timings][:wait], 0.0),
      max(entry[:timings][:receive], 0.0),
      max(entry[:timings][:ssl], 0.0)
    ]
  end
end

File.write(csv_filename, csv_string)