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# frozen_string_literal: true
# An environment name is not necessarily suitable for use in URLs, DNS
# or other third-party contexts, so provide a slugified version. A slug has
# the following properties:
# * contains only lowercase letters (a-z), numbers (0-9), and '-'
# * begins with a letter
# * has a maximum length of 24 bytes (OpenShift limitation)
# * cannot end with `-`
module Gitlab
module Slug
class Environment
attr_reader :name
def initialize(name)
@name = name
end
def generate
# Lowercase letters and numbers only
slugified = name.to_s.downcase.gsub(/[^a-z0-9]/, '-')
# Must start with a letter
slugified = 'env-' + slugified unless slugified.match?(/^[a-z]/)
# Repeated dashes are invalid (OpenShift limitation)
slugified.squeeze!('-')
slugified =
if slugified.size > 24 || slugified != name
# Maximum length: 24 characters (OpenShift limitation)
shorten_and_add_suffix(slugified)
else
# Cannot end with a dash (Kubernetes label limitation)
slugified.chomp('-')
end
slugified
end
private
def shorten_and_add_suffix(slug)
slug = slug[0..16]
slug << '-' unless slug.ends_with?('-')
slug << suffix
end
# Slugifying a name may remove the uniqueness guarantee afforded by it being
# based on name (which must be unique). To compensate, we add a predictable
# 6-byte suffix in those circumstances. This is not *guaranteed* uniqueness,
# but the chance of collisions is vanishingly small
def suffix
Digest::SHA2.hexdigest(name.to_s).to_i(16).to_s(36).last(6)
end
end
end
end
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