change s3 content-type using aws ruby sdk

gistfile1.txt

bash:

export AWS_ACCESS_KEY_ID='...'
export AWS_SECRET_ACCESS_KEY='...'
export AWS_REGION='us-east-1'

irb or ruby script:

require 'aws-sdk'
s3 = AWS::S3.new
bucket_name = 'bucket-name'
# a copy needs to be done to change the content-type
s3.buckets[bucket_name].objects.each do |object|
  k = object.key
  s3.buckets[bucket_name].objects[k].copy_from(k, :content_type => 'text/html')
end