ローカルサーバからS3へキャプチャされた画像をアップロードする

app.rb

#-*- encoding: utf-8

require 'sinatra/base'
require 'sinatra/reloader'
require 'slim'
require 'aws-sdk'
require 'base64'

require './access_secret.rb'

class Server < Sinatra::Base
  register Sinatra::Reloader

  helpers do
    # ふくわらいのバケットを取得する
    def GetFukuwarai()
      as = Credential.new

      s3 = AWS::S3.new(
        :access_key_id => as.access,
        :secret_access_key => as.secret
        )
      s3.buckets['fukuwarai']
    end
  end

  # テスト用
  get '/' do
    bucket = GetFukuwarai()
    object = bucket.objects['test.png']
    object.write(Pathname.new("./assets/img/test.png"))

    slim :index
  end

  post '/post' do
    bucket = GetFukuwarai()
    object = bucket.objects['images/' + params['fname']]
    data = Base64.decode64(params['data'])  # Base64をデコード
    #object.metadata['content-type'] = 'image/png'  # Unityで怒られる
    #object.acl = :public_read
    object.write(data, :acl => :public_read)
  end
end

Server.run! :host => 'localhost', :port => 4567