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|
#
# Keyring
#
# A collection of cryptographic keys.
#
class Keyring
class Error < RuntimeError
end
class NotFound < Error
def initialize(type)
super "no such key: #{type}"
end
end
def initialize(storage)
@storage = storage
end
def create(type, value)
raise Error, "key already exists" if storage.keys[type].present?
storage.set_key type, {type: type, value: value, rev: new_rev}.to_json
storage.save
end
def update(type, rev:, value:)
check_rev type, rev
storage.set_key type, {type: type, value: value, rev: new_rev}.to_json
storage.save
end
def delete(type, rev:)
check_rev type, rev
storage.delete_key type
storage.save
end
def key_of_type(type)
JSON.parse(storage.keys[type]) if storage.keys[type]
end
protected
attr_reader :storage
def check_rev(type, rev)
old = key_of_type(type)
raise NotFound, type unless old
raise Error, "wrong revision: #{rev}" unless old['rev'] == rev
end
def new_rev
SecureRandom.urlsafe_base64(8)
end
end
|
