anti_spam.rb

require 'net/http'
require 'uri'
require 'zbar'
require 'mini_magick'
require 'twitter'

SEARCH_KEYWORD      = ""
CONSUMER_KEY        = ""
CONSUMER_SECRET     = ""
ACCESS_TOKEN        = ""
ACCESS_TOKEN_SECRET = ""

module QRDecoder
  extend self
  def decode(data)
    img = MiniMagick::Image.read(data)
    img.format('PGM')
    pgm = img.to_blob
    res = ZBar::Image.from_pgm(pgm).process
    res.map &:data
  end

  def qrdecode_from_uri(uri)
    decode(Net::HTTP.get(URI.parse(uri)))
  end
end

def spam?(texts)
  texts.any? {|t| t.include?("line.me") }
end

client = Twitter::REST::Client.new do |config|
  config.consumer_key        = CONSUMER_KEY
  config.consumer_secret     = CONSUMER_SECRET
  config.access_token        = ACCESS_TOKEN
  config.access_token_secret = ACCESS_TOKEN_SECRET
end

media_tweets = client.search(SEARCH_KEYWORD, result_type: "recent", count:100).select do |tw|
  tw.media?
end

spam_tweets = media_tweets.select do |tw|
  tw.media.map(&:media_url).map(&:to_s).any? do |uri|
    spam? QRDecoder::qrdecode_from_uri(uri)
  end
end

p spam_tweets.map(&:full_text)
client.block spam_tweets.map(&:user)