Cloud Vision API Test

cloudvision.rb

require 'base64'
require 'json'
require 'net/https'

DIRECTORIES = ['DIR PATH']

API_KEY = 'PASTE YOUR API KEY'
API_URL = "https://vision.googleapis.com/v1/images:annotate?key=#{API_KEY}"

def detect(image_path)
  # 画像をbase64にエンコード
  base64_image = Base64.strict_encode64(File.new(image_path, 'rb').read)

  # APIリクエスト用のJSONパラメータの組み立て
  body = {
    requests: [{
      image: {
        content: base64_image
      },
      features: [
        {
          type: 'TEXT_DETECTION',
          maxResults: 5
        }
      ]
    }]
  }.to_json

  # Google Cloud Vision APIにリクエスト投げる
  uri = URI.parse(API_URL)
  https = Net::HTTP.new(uri.host, uri.port)
  https.use_ssl = true
  request = Net::HTTP::Post.new(uri.request_uri)
  request["Content-Type"] = "application/json"
  response = https.request(request, body)

  # APIレスポンス出力
  File.write(
    File.join(File.dirname(image_path),
              File.basename(image_path, '.*') + ".json",),
    response.body)
end

DIRECTORIES.each do |directory|
  Dir::glob(directory + '/*').each do |f|
    detect f
  end
end