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# frozen_string_literal: true
require 'openssl'
require_relative 'jwa/signing_algorithm'
require_relative 'jwa/ecdsa'
require_relative 'jwa/hmac'
require_relative 'jwa/none'
require_relative 'jwa/ps'
require_relative 'jwa/rsa'
require_relative 'jwa/unsupported'
module JWT
# The JWA module contains all supported algorithms.
module JWA
# @api private
class VerifierContext
attr_reader :jwa
def initialize(jwa:, keys:)
@jwa = jwa
@keys = Array(keys)
end
def verify(*args, **kwargs)
@keys.any? do |key|
@jwa.verify(*args, **kwargs, verification_key: key)
end
end
end
# @api private
class SignerContext
attr_reader :jwa
def initialize(jwa:, key:)
@jwa = jwa
@key = key
end
def sign(*args, **kwargs)
@jwa.sign(*args, **kwargs, signing_key: @key)
end
end
class << self
# @api private
def resolve(algorithm)
return find(algorithm) if algorithm.is_a?(String) || algorithm.is_a?(Symbol)
raise ArgumentError, 'Algorithm must be provided' if algorithm.nil?
raise ArgumentError, 'Custom algorithms are required to include JWT::JWA::SigningAlgorithm' unless algorithm.is_a?(SigningAlgorithm)
algorithm
end
# @api private
def resolve_and_sort(algorithms:, preferred_algorithm:)
Array(algorithms).map { |alg| JWA.resolve(alg) }
.partition { |alg| alg.valid_alg?(preferred_algorithm) }
.flatten
end
# @api private
def create_signer(algorithm:, key:)
if key.is_a?(JWK::KeyBase)
validate_jwk_algorithms!(key, algorithm, DecodeError)
return key
end
SignerContext.new(jwa: resolve(algorithm), key: key)
end
# @api private
def create_verifiers(algorithms:, keys:, preferred_algorithm:)
jwks, other_keys = keys.partition { |key| key.is_a?(JWK::KeyBase) }
validate_jwk_algorithms!(jwks, algorithms, VerificationError)
jwks + resolve_and_sort(algorithms: algorithms,
preferred_algorithm: preferred_algorithm)
.map { |jwa| VerifierContext.new(jwa: jwa, keys: other_keys) }
end
# @api private
def validate_jwk_algorithms!(jwks, algorithms, error_class)
algorithms = Array(algorithms)
return if algorithms.empty?
return if Array(jwks).all? do |jwk|
algorithms.any? do |alg|
jwk.jwa.valid_alg?(alg)
end
end
raise error_class, "Provided JWKs do not support one of the specified algorithms: #{algorithms.join(', ')}"
end
end
end
end
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