Google Trends API

main.rb

require "net/http"
require "uri"
require "json"
require "openssl"

TIMEZONE = (-9 * 60).to_s
HL = "en"

keywords = ["bitcoin"]

def get_ready(keywords)
  u = URI.parse("https://trends.google.com/trends/api/explore")
  u.query = URI.encode_www_form(
    [
      ["hl", HL],
      ["tz", TIMEZONE],
      ["req", JSON.generate({"comparisonItem" => ["keyword" => keywords[0].to_s, "geo" => "", "time" => "now 7-d"], "category" => 0, "property" => ""})]
    ]
  )
  
  h = Net::HTTP.new(u.host, u.port)
  h.use_ssl = true
  h.verify_mode = OpenSSL::SSL::VERIFY_NONE
  
  return JSON.parse(h.start{h.get(u.path + ?? + u.query)}.body[5..-1])["widgets"]
end

def get_interest_over_time(request, token)
  request["requestOptions"]["category"] = 0
  request["requestOptions"]["property"] = ""
  
  u = URI.parse("https://trends.google.com/trends/api/widgetdata/multiline")
  u.query = URI.encode_www_form(
    [
      ["hl", HL],
      ["tz", TIMEZONE],
      ["req", JSON.generate(request)],
      ["token", token]
    ]
  )
  
  h = Net::HTTP.new(u.host, u.port)
  h.use_ssl = true
  h.verify_mode = OpenSSL::SSL::VERIFY_NONE
  
  return JSON.parse(h.start{h.get(u.path + ?? + u.query)}.body[5..-1])
end

ready_data = get_ready(keywords)
timelineData = get_interest_over_time(ready_data[0]["request"], ready_data[0]["token"])["default"]["timelineData"]
puts timelineData.map{|e|
  manth, day, year, _, time, am_pm = e["formattedTime"].split
  value = e["value"][0]
  "#{manth} #{day.rjust(3)} #{year} at #{time.rjust(5)} #{am_pm}:#{?X*value} #{value}"
}