--- /dev/null
+require 'puppet_x/bodeco/util'
+
+module Puppet::Parser::Functions
+ # Public: go file md5 checksum
+ #
+ # args[0] - username
+ # args[1] - password
+ # args[2] - file_name
+ # args[3] - go md5 checksum url
+ #
+ # http://www.thoughtworks.com/products/docs/go/12.4/help/Artifacts_API.html
+ #
+ # Returns specific file's md5 from go server md5 checksum file
+ newfunction(:go_md5, type: :rvalue) do |args|
+ raise(ArgumentError, "Invalid go md5 info url #{args}") unless args.size == 4
+
+ username, password, file, url = args
+
+ uri = URI(url)
+ response = PuppetX::Bodeco::Util.content(uri, username: username, password: password)
+
+ checksums = response.split("\n")
+ line = checksums.find { |x| x =~ %r{#{file}=} }
+ md5 = line.match(%r{\b[0-9a-f]{5,40}\b})
+ raise("Could not parse md5 from url#{url} response: #{response.body}") unless md5
+ md5[0]
+ end
+end