diff options
Diffstat (limited to 'activesupport/lib/active_support/message_verifier.rb')
| -rw-r--r-- | activesupport/lib/active_support/message_verifier.rb | 53 |
1 files changed, 47 insertions, 6 deletions
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb index b889f31f7a..fdd2185f7f 100644 --- a/activesupport/lib/active_support/message_verifier.rb +++ b/activesupport/lib/active_support/message_verifier.rb @@ -3,6 +3,7 @@ require "base64" require_relative "core_ext/object/blank" require_relative "security_utils" +require_relative "messages/metadata" module ActiveSupport # +MessageVerifier+ makes it easy to generate and verify messages which are @@ -32,6 +33,46 @@ module ActiveSupport # `:digest` key as an option while initializing the verifier: # # @verifier = ActiveSupport::MessageVerifier.new('s3Krit', digest: 'SHA256') + # + # === Confining messages to a specific purpose + # + # By default any message can be used throughout your app. But they can also be + # confined to a specific +:purpose+. + # + # token = @verifier.generate("this is the chair", purpose: :login) + # + # Then that same purpose must be passed when verifying to get the data back out: + # + # @verifier.verified(token, purpose: :login) # => "this is the chair" + # @verifier.verified(token, purpose: :shipping) # => nil + # @verifier.verified(token) # => nil + # + # @verifier.verify(token, purpose: :login) # => "this is the chair" + # @verifier.verify(token, purpose: :shipping) # => ActiveSupport::MessageVerifier::InvalidSignature + # @verifier.verify(token) # => ActiveSupport::MessageVerifier::InvalidSignature + # + # Likewise, if a message has no purpose it won't be returned when verifying with + # a specific purpose. + # + # token = @verifier.generate("the conversation is lively") + # @verifier.verified(token, purpose: :scare_tactics) # => nil + # @verifier.verified(token) # => "the conversation is lively" + # + # @verifier.verify(token, purpose: :scare_tactics) # => ActiveSupport::MessageVerifier::InvalidSignature + # @verifier.verify(token) # => "the conversation is lively" + # + # === Making messages expire + # + # By default messages last forever and verifying one year from now will still + # return the original value. But messages can be set to expire at a given + # time with +:expires_in+ or +:expires_at+. + # + # @verifier.generate(parcel, expires_in: 1.month) + # @verifier.generate(doowad, expires_at: Time.now.end_of_year) + # + # Then the messages can be verified and returned upto the expire time. + # Thereafter, the +verified+ method returns +nil+ while +verify+ raises + # <tt>ActiveSupport::MessageVerifier::InvalidSignature</tt>. class MessageVerifier class InvalidSignature < StandardError; end @@ -79,11 +120,11 @@ module ActiveSupport # # incompatible_message = "test--dad7b06c94abba8d46a15fafaef56c327665d5ff" # verifier.verified(incompatible_message) # => TypeError: incompatible marshal file format - def verified(signed_message) + def verified(signed_message, purpose: nil) if valid_message?(signed_message) begin data = signed_message.split("--".freeze)[0] - @serializer.load(decode(data)) + Messages::Metadata.verify(@serializer.load(decode(data)), purpose) rescue ArgumentError => argument_error return if argument_error.message.include?("invalid base64") raise @@ -103,8 +144,8 @@ module ActiveSupport # # other_verifier = ActiveSupport::MessageVerifier.new 'd1ff3r3nt-s3Krit' # other_verifier.verify(signed_message) # => ActiveSupport::MessageVerifier::InvalidSignature - def verify(signed_message) - verified(signed_message) || raise(InvalidSignature) + def verify(signed_message, purpose: nil) + verified(signed_message, purpose: purpose) || raise(InvalidSignature) end # Generates a signed message for the provided value. @@ -114,8 +155,8 @@ module ActiveSupport # # verifier = ActiveSupport::MessageVerifier.new 's3Krit' # verifier.generate 'a private message' # => "BAhJIhRwcml2YXRlLW1lc3NhZ2UGOgZFVA==--e2d724331ebdee96a10fb99b089508d1c72bd772" - def generate(value) - data = encode(@serializer.dump(value)) + def generate(value, expires_at: nil, expires_in: nil, purpose: nil) + data = encode(@serializer.dump(Messages::Metadata.wrap(value, expires_at: expires_at, expires_in: expires_in, purpose: purpose))) "#{data}--#{generate_digest(data)}" end |