Class: ExpoTurbo::Rails::CompatibilityRegistry

Inherits:
Object
  • Object
show all
Defined in:
lib/expo_turbo/rails/compatibility_registry.rb

Defined Under Namespace

Classes: Entry

Constant Summary collapse

DIGEST_PATTERN = 
/\Asha256-128:[0-9a-f]{32}\z/
DESCRIPTOR_VALUE_PATTERN = 
/\A[A-Za-z0-9._:+-]+\z/

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lock:, vocabularies:) ⇒ CompatibilityRegistry

Returns a new instance of CompatibilityRegistry.



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# File 'lib/expo_turbo/rails/compatibility_registry.rb', line 100

def initialize(lock:, vocabularies:)
  unless lock.is_a?(Hash) && lock["lockVersion"] == 1 && lock["history"].is_a?(Array)
    raise ConfigurationError, "Expo Turbo compatibility lock is invalid"
  end
  digests = {}
  revisions = {}
  @entries = lock.fetch("history").to_h do |record|
    digest = record["digest"]
    revision = record["revision"]
    unless DIGEST_PATTERN.match?(digest) && revision.is_a?(Integer) && revision.positive?
      raise ConfigurationError, "Expo Turbo compatibility lock history is invalid"
    end
    if revisions.key?(revision)
      raise ConfigurationError, "Expo Turbo compatibility lock revisions must be unique"
    end
    if digests.key?(digest)
      raise ConfigurationError, "Expo Turbo compatibility lock digests must be unique"
    end
    digests[digest] = true
    revisions[revision] = true
    components = vocabularies.fetch(digest, {})
    components.each_with_index do |(tag, attributes), component_index|
      RegistryIdentifier.validate!(tag, "components[#{component_index}].tag")
      Array(attributes).each_with_index do |attribute, attribute_index|
        RegistryIdentifier.validate!(attribute, "components[#{component_index}].attributes[#{attribute_index}].name")
      end
    end
    [digest, Entry.new(digest:, revision:, components: components.freeze).freeze]
  end.freeze
  current = lock["current"]
  unless @entries.key?(current)
    raise ConfigurationError, "Expo Turbo compatibility lock current digest is unknown"
  end
  freeze
rescue KeyError
  raise ConfigurationError, "Expo Turbo compatibility lock vocabulary is missing"
end

Class Method Details

.from_data(lock:, vocabularies:) ⇒ Object 



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# File 'lib/expo_turbo/rails/compatibility_registry.rb', line 23

def self.from_data(lock:, vocabularies:)
  new(lock:, vocabularies:)
end

.load(lockfile) ⇒ Object 



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# File 'lib/expo_turbo/rails/compatibility_registry.rb', line 27

def self.load(lockfile)
  path = Pathname(lockfile)
  lock = JSON.parse(File.binread(path))
  vocabularies = lock.fetch("history").to_h do |entry|
    manifest_path = path.dirname.join(entry.fetch("manifest"))
    manifest = JSON.parse(File.binread(manifest_path))
    validate_manifest_identifiers!(manifest)
    unless manifest["hash"] == entry.fetch("digest")
      raise ConfigurationError, "Expo Turbo compatibility manifest digest does not match its lock entry"
    end
    digest_source = {
      "components" => manifest.fetch("components"),
      "modules" => manifest.fetch("modules"),
      "protocolVersion" => manifest.fetch("protocolVersion")
    }
    computed_digest = "sha256-128:#{Digest::SHA256.hexdigest(JSON.generate(digest_source))[0, 32]}"
    unless computed_digest == entry.fetch("digest")
      raise ConfigurationError, "Expo Turbo compatibility manifest computed digest does not match its lock entry"
    end
    components = manifest.fetch("components").to_h do |component|
      [component.fetch("tag"), component.fetch("attributes").map { |attribute| attribute.fetch("name") }]
    end
    [entry.fetch("digest"), components]
  end
  new(lock:, vocabularies:)
rescue SystemCallError, JSON::ParserError, KeyError, NoMethodError, TypeError
  raise ConfigurationError, "Expo Turbo compatibility lock could not be loaded"
end

.parse_descriptor(value) ⇒ Object 



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# File 'lib/expo_turbo/rails/compatibility_registry.rb', line 76

def self.parse_descriptor(value)
  return unless value.is_a?(String)

  value = value.dup.force_encoding(Encoding::UTF_8)
  return unless value.valid_encoding? && value.ascii_only?

  fields = {}
  valid = value.split(";", -1).all? do |part|
    name, field_value = part.strip.split("=", 2)
    next false unless name && field_value && !fields.key?(name)
    next false unless DESCRIPTOR_VALUE_PATTERN.match?(name) && DESCRIPTOR_VALUE_PATTERN.match?(field_value)

    fields[name] = field_value
    true
  end
  return unless valid
  expected_fields = fields.key?("vocab") ? %w[proto rt v vocab] : %w[proto rt v]
  return unless fields.keys.sort == expected_fields.sort
  return unless fields["v"] == "1" && fields["proto"] == PROTOCOL_VERSION && fields["rt"]
  return unless fields["vocab"].nil? || DIGEST_PATTERN.match?(fields["vocab"])

  fields.freeze
end

Instance Method Details

#resolve(digest) ⇒ Object 



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# File 'lib/expo_turbo/rails/compatibility_registry.rb', line 138

def resolve(digest)
  @entries[digest]
end