Fix region configuration for LoginCredential's Signin client (#3319)

Author: richardwang1124

gems/aws-sdk-core/CHANGELOG.md

@@ -1,6 +1,8 @@
 Unreleased Changes
 ------------------
 
+* Issue - Fix region configuration for LoginCredential's Signin client.
+
 3.238.0 (2025-11-19)
 ------------------
 

gems/aws-sdk-core/lib/aws-sdk-core/credential_provider_chain.rb

@@ -110,7 +110,10 @@ def static_profile_login_credentials(options)
       return unless Aws.shared_config.config_enabled? && options[:config]&.profile
 
       with_metrics('CREDENTIALS_CODE') do
-        creds = Aws.shared_config.login_credentials_from_config(profile: options[:config].profile)
+        creds = Aws.shared_config.login_credentials_from_config(
+          profile: options[:config].profile,
+          region: options[:config].region
+        )
         return unless creds
 
         creds.metrics << 'CREDENTIALS_CODE'
@@ -170,7 +173,7 @@ def login_credentials(options)
       return unless Aws.shared_config.config_enabled?
 
       profile_name = determine_profile_name(options)
-      Aws.shared_config.login_credentials_from_config(profile: profile_name)
+      Aws.shared_config.login_credentials_from_config(profile: profile_name, region: options[:config].region)
     rescue Errors::NoSuchProfileError
       nil
     end

gems/aws-sdk-core/lib/aws-sdk-core/shared_config.rb

@@ -176,8 +176,8 @@ def sso_token_from_config(opts = {})
     # file, if present.
     def login_credentials_from_config(opts = {})
       p = opts[:profile] || @profile_name
-      credentials = login_credentials_from_profile(@parsed_credentials, p)
-      credentials ||= login_credentials_from_profile(@parsed_config, p) if @parsed_config
+      credentials = login_credentials_from_profile(@parsed_credentials, p, opts[:region])
+      credentials ||= login_credentials_from_profile(@parsed_config, p, opts[:region]) if @parsed_config
       credentials
     end
 
@@ -479,10 +479,12 @@ def sso_token_from_profile(cfg, profile)
       end
     end
 
-    def login_credentials_from_profile(cfg, profile)
+    def login_credentials_from_profile(cfg, profile, region)
       return unless @parsed_config && (prof_config = cfg[profile]) && prof_config['login_session']
 
-      creds = LoginCredentials.new(login_session: prof_config['login_session'])
+      cfg = { login_session: prof_config['login_session'] }
+      cfg[:region] = region if region
+      creds = LoginCredentials.new(cfg)
       creds.metrics << 'CREDENTIALS_PROFILE_LOGIN'
       creds
     end

gems/aws-sdk-core/spec/aws/login_credentials_spec.rb

@@ -186,6 +186,10 @@ module Aws
           }
         end
 
+        before do
+          allow_any_instance_of(LoginCredentials).to receive(:warn).with(/WARNING: OpenSSL 3.6.x/)
+        end
+
         it 'refreshes the token' do
           mock_token_file(login_session, cached_token)
           client.stub_responses(:create_o_auth_2_token, signin_resp)

services.json

@@ -1220,7 +1220,8 @@
     "models": "signer/2017-08-25"
   },
   "Signin": {
-    "models": "signin/2023-01-01"
+    "models": "signin/2023-01-01",
+    "gemName": "aws-sdk-core"
   },
   "SimSpaceWeaver": {
     "models": "simspaceweaver/2022-10-28"