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