♻️ Allow keyword args on all SASL authenticators

lib/net/imap/sasl/digest_md5_authenticator.rb

@@ -41,7 +41,8 @@ class Net::IMAP::SASL::DigestMD5Authenticator
   attr_reader :authzid
 
   # :call-seq:
-  #   new(username,  password,  authzid = nil) -> authenticator
+  #   new(username,  password,  authzid = nil, **options) -> authenticator
+  #   new(username:, password:, authzid:  nil, **options) -> authenticator
   #
   # Creates an Authenticator for the "+DIGEST-MD5+" SASL mechanism.
   #
@@ -55,7 +56,12 @@ class Net::IMAP::SASL::DigestMD5Authenticator
   # * +warn_deprecation+ — Set to +false+ to silence the warning.
   #
   # See the documentation for each attribute for more details.
-  def initialize(username, password, authzid = nil, warn_deprecation: true)
+  def initialize(user = nil, pass = nil, authz = nil,
+                 username: nil, password: nil, authzid: nil,
+                 warn_deprecation: true, **)
+    username ||= user or raise ArgumentError, "missing username"
+    password ||= pass or raise ArgumentError, "missing password"
+    authzid  ||= authz
     if warn_deprecation
       warn "WARNING: DIGEST-MD5 SASL mechanism was deprecated by RFC6331."
       # TODO: recommend SCRAM instead.

lib/net/imap/sasl/external_authenticator.rb

@@ -29,7 +29,7 @@ class ExternalAuthenticator
         # #authzid is an optional identity to act as or on behalf of.
         #
         # Any other keyword parameters are quietly ignored.
-        def initialize(authzid: nil)
+        def initialize(authzid: nil, **)
           @authzid = authzid&.to_str&.encode "UTF-8"
           if @authzid&.match?(/\u0000/u) # also validates UTF8 encoding
             raise ArgumentError, "contains NULL"

lib/net/imap/sasl/plain_authenticator.rb

@@ -37,7 +37,8 @@ class Net::IMAP::SASL::PlainAuthenticator
   attr_reader :authzid
 
   # :call-seq:
-  #   new(username, password, authzid: nil) -> authenticator
+  #   new(username,  password,  authzid: nil, **) -> authenticator
+  #   new(username:, password:, authzid: nil, **) -> authenticator
   #
   # Creates an Authenticator for the "+PLAIN+" SASL mechanism.
   #
@@ -50,10 +51,13 @@ class Net::IMAP::SASL::PlainAuthenticator
   # * #authzid ― Alternate identity to act as or on behalf of.  Optional.
   #
   # See attribute documentation for more details.
-  def initialize(username, password, authzid: nil)
-    raise ArgumentError, "username contains NULL" if username&.include?(NULL)
-    raise ArgumentError, "password contains NULL" if password&.include?(NULL)
-    raise ArgumentError, "authzid  contains NULL" if authzid&.include?(NULL)
+  def initialize(user = nil, pass = nil,
+                 username: nil, password: nil, authzid: nil, **)
+    username ||= user or raise ArgumentError, "missing username"
+    password ||= pass or raise ArgumentError, "missing password"
+    raise ArgumentError, "username contains NULL" if username.include?(NULL)
+    raise ArgumentError, "password contains NULL" if password.include?(NULL)
+    raise ArgumentError, "authzid contains NULL"  if authzid&.include?(NULL)
     @username = username
     @password = password
     @authzid  = authzid

lib/net/imap/sasl/xoauth2_authenticator.rb

@@ -32,8 +32,8 @@ class Net::IMAP::SASL::XOAuth2Authenticator
   attr_reader :oauth2_token
 
   # :call-seq:
-  # :call-seq:
-  #   new(username,  oauth2_token) -> authenticator
+  #   new(username,  oauth2_token,  **) -> authenticator
+  #   new(username:, oauth2_token:, **) -> authenticator
   #
   # Creates an Authenticator for the "+XOAUTH2+" SASL mechanism, as specified by
   # Google[https://developers.google.com/gmail/imap/xoauth2-protocol],
@@ -47,9 +47,15 @@ class Net::IMAP::SASL::XOAuth2Authenticator
   #   the service for #username.
   #
   # See the documentation for each attribute for more details.
-  def initialize(username, oauth2_token)
-    @username = username
-    @oauth2_token = oauth2_token
+  def initialize(user = nil, token = nil, username: nil, oauth2_token: nil, **)
+    @username = username || user or
+      raise ArgumentError, "missing username"
+    @oauth2_token = oauth2_token || token or
+      raise ArgumentError, "missing oauth2_token"
+    [username, user].compact.count == 1 or
+      raise ArgumentError, "conflicting values for username"
+    [oauth2_token, token].compact.count == 1 or
+      raise ArgumentError, "conflicting values for oauth2_token"
   end
 
   # :call-seq:

test/net/imap/test_imap_authenticators.rb

@@ -95,6 +95,17 @@ def test_xoauth2_response
     )
   end
 
+  def test_xoauth2_kwargs
+    assert_equal(
+      "user=arg\1auth=Bearer kwarg\1\1",
+      xoauth2("arg", oauth2_token: "kwarg").process(nil)
+    )
+    assert_equal(
+      "user=user\1auth=Bearer kwarg\1\1",
+      xoauth2(username: "user", oauth2_token: "kwarg").process(nil)
+    )
+  end
+
   def test_xoauth2_supports_initial_response
     assert xoauth2("foo", "bar").initial_response?
     assert Net::IMAP::SASL.initial_response?(xoauth2("foo", "bar"))