aboutsummaryrefslogtreecommitdiffstats
path: root/activesupport
diff options
context:
space:
mode:
Diffstat (limited to 'activesupport')
-rw-r--r--activesupport/CHANGELOG.md28
-rw-r--r--activesupport/lib/active_support/message_encryptor.rb32
-rw-r--r--activesupport/lib/active_support/message_verifier.rb40
3 files changed, 100 insertions, 0 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index f5542c6d25..ef46bc06e0 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,31 @@
+* Add purpose and expiry support to `MessageVerifier` & `MessageEncryptor`.
+
+ Messages generated using `MessageVerifier` and `MessageEncryptor` now
+ support expiry and purpose. You can set the purpose of the message using
+ the key :purpose, and likewise, the expiration using :expires_at or :expires_in.
+
+ This ensures that the message is used only for its intended purpose and also
+ while it hasn't expired.
+
+ For instance, to ensure a message is only usable for one intended purpose:
+
+ token = @verifier.generate("x", purpose: :shipping)
+
+ @verifier.verified(token, purpose: :shipping) # => "x"
+ @verifier.verified(token) # => nil
+
+ Or make it expire after a set time:
+
+ @verifier.generate("x", expires_in: 1.month)
+ @verifier.generate("y", expires_at: Time.now.end_of_year)
+
+ Showcased with `ActiveSupport::MessageVerifier`, but works the same for
+ `ActiveSupport::MessageEncryptor`'s `encrypt_and_sign` and `decrypt_and_verify`.
+
+ Pull requests: #29599, #29854
+
+ *Assain Jaleel*
+
* Make the order of `Hash#reverse_merge!` consistent with `HashWithIndifferentAccess`.
*Erol Fornoles*
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb
index 9ceb3a3a7f..090d51933a 100644
--- a/activesupport/lib/active_support/message_encryptor.rb
+++ b/activesupport/lib/active_support/message_encryptor.rb
@@ -22,6 +22,38 @@ module ActiveSupport
# crypt = ActiveSupport::MessageEncryptor.new(key) # => #<ActiveSupport::MessageEncryptor ...>
# encrypted_data = crypt.encrypt_and_sign('my secret data') # => "NlFBTTMwOUV5UlA1QlNEN2xkY2d6eThYWWh..."
# crypt.decrypt_and_verify(encrypted_data) # => "my secret data"
+ #
+ # === 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 = crypt.encrypt_and_sign("this is the chair", purpose: :login)
+ #
+ # Then that same purpose must be passed when verifying to get the data back out:
+ #
+ # crypt.decrypt_and_verify(token, purpose: :login) # => "this is the chair"
+ # crypt.decrypt_and_verify(token, purpose: :shipping) # => nil
+ # crypt.decrypt_and_verify(token) # => nil
+ #
+ # Likewise, if a message has no purpose it won't be returned when verifying with
+ # a specific purpose.
+ #
+ # token = crypt.encrypt_and_sign("the conversation is lively")
+ # crypt.decrypt_and_verify(token, purpose: :scare_tactics) # => nil
+ # crypt.decrypt_and_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+.
+ #
+ # crypt.encrypt_and_sign(parcel, expires_in: 1.month)
+ # crypt.encrypt_and_sign(doowad, expires_at: Time.now.end_of_year)
+ #
+ # Then the messages can be verified and returned upto the expire time.
+ # Thereafter, verifying returns +nil+.
class MessageEncryptor
class << self
attr_accessor :use_authenticated_message_encryption #:nodoc:
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index 76b3865bf2..fdd2185f7f 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -33,6 +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