upload-images-s3-sdk-ruby.rb

#Using gem aws-sdk for a ror application for uploading images to s3
#Uploading images to a fixed bucket with different folders for each object or application.
#The s3 keeps a limitation on the number of buckets creattion whereas there is no
#limitation for content inside a bucket.
#
#This code will upload image for a user to s3 using aws-sdk gem. The bucket and the image uploaded are made public 
#so that the images uploaded are directly accessible. The input is takes is the image complete path 
#where it is present, folder in which it should be uploaded and user_id for whom it should 
#be uploaded.
#
  def save_screenshot_to_s3(image_location, folder_name,user_id)
    service = AWS::S3.new(:access_key_id => ACCESS_KEY_ID,
                          :secret_access_key => SECRET_ACCESS_KEY)
    bucket_name = "app-images"
    if(service.buckets.include?(bucket_name))
      bucket = service.buckets[bucket_name]
    else
      bucket = service.buckets.create(bucket_name)
    end
    bucket.acl = :public_read
    key = folder_name.to_s + "/" + File.basename(image_location)
    s3_file = service.buckets[bucket_name].objects[key].write(:file => image_location)
    s3_file.acl = :public_read
    user = User.where(id: user_id).first
    user.image = s3_file.public_url.to_s
    user.save
  end