Fixes issue #3479 where S3ForcePathStyle is unable to be read from a config file

generator/.DevConfigs/666f52b5-8ab6-4817-b54c-f42d2d41bb46.json

@@ -0,0 +1,18 @@
+{
+    "core": {
+        "changeLogMessages": [
+          "Add S3ForcePathStyle as a config option for credential profiles."
+        ],
+        "type": "patch",
+        "updateMinimum": true
+      },
+    "services": [
+        {
+            "serviceName": "S3",
+            "type": "patch",
+            "changeLogMessages": [
+                "Fixes [issue 3479](https://github.com/aws/aws-sdk-net/issues/3479) where ForcePathStyle is unable to be read from the config file"
+            ]
+        }
+    ]
+}

sdk/src/Core/Amazon.Runtime/CredentialManagement/CredentialProfile.cs

@@ -93,6 +93,11 @@ internal Dictionary<string, Dictionary<string, string>> NestedProperties
         /// If true, the use of multi-region access points is disabled.
         /// </summary>
         public bool? S3DisableMultiRegionAccessPoints { get; set; }
+
+        /// <summary>
+        /// When true, S3 requests will always use path style addressing.
+        /// </summary>
+        public bool? S3ForcePathStyle { get; set; }
 
         /// <summary>
         /// The Sts Regional Endpoints Value as either legacy or regional

sdk/src/Core/Amazon.Runtime/CredentialManagement/SharedCredentialsFile.cs

@@ -71,6 +71,7 @@ public class SharedCredentialsFile : ICredentialProfileStore
         private const string RequestMinCompressionSizeBytesField = "request_min_compression_size_bytes";
         private const string ClientAppIdField = "sdk_ua_app_id";
         private const string AccountIdEndpointModeField = "account_id_endpoint_mode";
+        private const string S3ForcePathStyleField = "s3_force_path_style";
         private readonly Logger _logger = Logger.GetLogger(typeof(SharedCredentialsFile));
 
         private static readonly HashSet<string> ReservedPropertyNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
@@ -104,7 +105,8 @@ public class SharedCredentialsFile : ICredentialProfileStore
             DisableRequestCompressionField,
             RequestMinCompressionSizeBytesField,
             ClientAppIdField,
-            AccountIdEndpointModeField
+            AccountIdEndpointModeField,
+            S3ForcePathStyleField
         };
 
         /// <summary>
@@ -443,9 +445,13 @@ private void RegisterProfileInternal(CredentialProfile profile)
 
             if (profile.ClientAppId != null)
                 reservedProperties[ClientAppIdField] = profile.ClientAppId;
+
             if (profile.AccountIdEndpointMode != null)
                 reservedProperties[AccountIdEndpointModeField] = profile.AccountIdEndpointMode.ToString().ToLowerInvariant();
 
+            if (profile.S3ForcePathStyle != null)
+                reservedProperties[S3ForcePathStyleField] = profile.S3ForcePathStyle.ToString().ToLowerInvariant();
+
             var profileDictionary = PropertyMapping.CombineProfileParts(
                 profile.Options, ReservedPropertyNames, reservedProperties, profile.Properties);
 
@@ -966,6 +972,21 @@ private bool TryGetProfile(string profileName, bool doRefresh, bool isSsoSession
 
 #endif
                 }
+
+                string s3ForcePathStyleString;
+                bool? s3ForcePathStyle = null;
+                if (reservedProperties.TryGetValue(S3ForcePathStyleField, out s3ForcePathStyleString))
+                {
+                    bool s3ForcePathStyleOut;
+                    if (!bool.TryParse(s3ForcePathStyleString, out s3ForcePathStyleOut))
+                    {
+                        Logger.GetLogger(GetType()).InfoFormat("Invalid value {0} for {1} in profile {2}. A boolean true/false is expected.", s3ForcePathStyleString, S3ForcePathStyleField, profileName);
+                        profile = null;
+                        return false;
+                    }
+                    s3ForcePathStyle = s3ForcePathStyleOut;
+                }
+
                     profile = new CredentialProfile(profileName, profileOptions)
                 {
                     UniqueKey = toolkitArtifactGuid,
@@ -992,7 +1013,8 @@ private bool TryGetProfile(string profileName, bool doRefresh, bool isSsoSession
                     DisableRequestCompression = disableRequestCompression,
                     RequestMinCompressionSizeBytes = requestMinCompressionSizeBytes,
                     ClientAppId = clientAppId,
-                    AccountIdEndpointMode = accountIdEndpointMode
+                    AccountIdEndpointMode = accountIdEndpointMode,
+                    S3ForcePathStyle = s3ForcePathStyle
                 };
 
                 if (!IsSupportedProfileType(profile.ProfileType))

sdk/src/Services/S3/Custom/AmazonS3Config.cs

@@ -36,7 +36,7 @@ public partial class AmazonS3Config : ClientConfig
         private const string AwsS3UsEast1RegionalEndpointsEnvironmentVariable = "AWS_S3_US_EAST_1_REGIONAL_ENDPOINT";
         private const string DisableMRAPEnvName = "AWS_S3_DISABLE_MULTIREGION_ACCESS_POINTS";
 
-        private bool forcePathStyle = false;
+        private bool? _forcePathStyle;
         private bool useAccelerateEndpoint = false;
         private S3UsEast1RegionalEndpointValue? s3UsEast1RegionalEndpointValue;
         private readonly string legacyUSEast1GlobalRegionSystemName = RegionEndpoint.USEast1.SystemName;
@@ -61,13 +61,40 @@ public IS3ExpressCredentialProvider S3ExpressCredentialProvider
             set { s3ExpressCredentialProvider = value; }
         }
 
+        private object _forcePathStyleLock = new object();
         /// <summary>
         /// When true, requests will always use path style addressing.
         /// </summary>
         public bool ForcePathStyle
         {
-            get { return forcePathStyle; }
-            set { forcePathStyle = value; }
+            get
+            {
+                if (_forcePathStyle.HasValue)
+                {
+                    return _forcePathStyle.GetValueOrDefault();
+                }
+
+                ResolveCredentialProfile();
+
+                lock (_forcePathStyleLock)
+                {
+                    if (_forcePathStyle.HasValue)
+                    {
+                        return _forcePathStyle.Value;
+                    }
+
+                    _forcePathStyle = _profile?.S3ForcePathStyle;
+                    return _forcePathStyle.GetValueOrDefault();
+                }
+            }
+
+            set
+            {
+                lock (_forcePathStyleLock)
+                {
+                    _forcePathStyle = value;
+                }
+            }
         }
 
         /// <summary>

sdk/test/Services/S3/UnitTests/Custom/S3ForcePathStyleTests.cs

@@ -0,0 +1,81 @@
+using Amazon.S3;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.IO;
+using AWSSDK_DotNet.CommonTest.Utils;
+using Amazon.Runtime.CredentialManagement;
+
+namespace AWSSDK.UnitTests
+{
+    [TestClass]
+    public class S3ForcePathStyleTests
+    {
+        private static readonly string ProfileText =
+            @"[enable_force_path_style]
+                region = us-west-2
+                aws_access_key_id = default_aws_access_key_id   
+                aws_secret_access_key = default_aws_secret_access_key
+                s3_force_path_style = true
+                [disable_force_path_style]
+                region = us-west-2
+                aws_access_key_id = other_aws_access_key_id
+                aws_secret_access_key = other_aws_secret_access_key
+                s3_force_path_style = false";
+
+        private const string AWSProfileVariable = "AWS_PROFILE";
+        private string _beginningAWSProfileEnvironmentValue;
+        private string _tempCredentialsFilePath;
+
+        [TestInitialize]
+        public void Initialize()
+        {
+            // Save off current environment variable value to restore later
+            _beginningAWSProfileEnvironmentValue = Environment.GetEnvironmentVariable(AWSProfileVariable);
+
+            // Then clear the current value so every test is starting from a clean slate
+            Environment.SetEnvironmentVariable(AWSProfileVariable, "");
+
+            // set credentials file and use it to load CredentialProfileStoreChain
+            _tempCredentialsFilePath = Path.GetTempFileName();
+            File.WriteAllText(_tempCredentialsFilePath, ProfileText);
+            ReflectionHelpers.Invoke(typeof(AmazonS3Config), "credentialProfileChain", new CredentialProfileStoreChain(_tempCredentialsFilePath));
+            ReflectionHelpers.Invoke(typeof(AmazonS3Config), "_triedToResolveProfile", false);
+        }
+
+        [TestCleanup]
+        public void RestoreOriginalSettings()
+        {
+            Environment.SetEnvironmentVariable(AWSProfileVariable, _beginningAWSProfileEnvironmentValue);
+            File.Delete(_tempCredentialsFilePath);
+        }
+
+        [TestMethod]
+        [TestCategory("S3")]
+        public void CredentialProfileEnable_ShouldApplyToS3Config()
+        {
+            Environment.SetEnvironmentVariable(AWSProfileVariable, "enable_force_path_style");
+            var config = new AmazonS3Config();
+            Assert.IsTrue(config.ForcePathStyle);
+        }
+
+        [TestMethod]
+        [TestCategory("S3")]
+        public void UnsetForcePathStyleShouldDefaultToFalse()
+        {
+            var config = new AmazonS3Config();
+            Assert.IsFalse(config.ForcePathStyle);
+        }
+
+        [TestMethod]
+        [TestCategory("S3")]
+        public void ConfigShouldOverrideProfile()
+        {
+            Environment.SetEnvironmentVariable(AWSProfileVariable, "enable_force_path_style");
+            var config = new AmazonS3Config
+            {
+                ForcePathStyle = false
+            };
+            Assert.IsFalse(config.ForcePathStyle);
+        }
+    }
+}