Since none of the examples that I could find on the internet of how to invalidate a cloudfront asset in ruby were correct, I decided to post my solution:
require 'rubygems' # may not be needed
require 'openssl'
require 'digest/sha1'
require 'net/https'
require 'base64'
class CloudfrontInvalidator
def initialize(aws_account, aws_secret, distribution)
@aws_account = aws_account
@aws_secret = aws_secret
@distribution = distribution
end
def invalidate(path)
date = Time.now.strftime("%a, %d %b %Y %H:%M:%S %Z")
digest = Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), @aws_secret, date)).strip
uri = URI.parse("https://cloudfront.amazonaws.com/2010-08-01/distribution/#{@distribution}/invalidation")
req = Net::HTTP::Post.new(uri.path)
req.initialize_http_header({
'x-amz-date' => date,
'Content-Type' => 'text/xml',
'Authorization' => "AWS %s:%s" % [@aws_account, digest]
})
req.body = %|<InvalidationBatch><Path>#{path}</Path><CallerReference>SOMETHING_SPECIAL_#{Time.now.utc.to_i}</CallerReference></InvalidationBatch>|
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
res = http.request(req)
# it was successful if response code was a 201
return res.code == '201'
end
end
Then just run it with:
puts CloudfrontInvalidator.new('ACCOUNT', 'SECRET', 'DISTRIBUTION').invalidate('PATH_TO_FILE')
14 Comments
Thanks. This is exactly what I was looking for today. Worked like a charm.
This is great! FYI i’ve modified it slightly to take any number of path args like so:
def invalidate(*paths)
paths = paths.flatten.map{|p| “#{p}”}.join
…
end
That previous post stripped out my Path tags that wrap the #{p} in the path string mapping
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