feat: Add Swift 6 language mode support

.github/workflows/continuous-integration.yml

@@ -21,7 +21,6 @@ jobs:
           - macos-14
           - macos-15
         xcode:
-          - Xcode_15.2
           - Xcode_16.1
         destination:
           - 'platform=iOS Simulator,OS=17.2,name=iPhone 15'
@@ -32,26 +31,13 @@ jobs:
           - 'platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro'
           - 'platform=macOS'
         exclude:
-          # Don't run old macOS with new Xcode
-          - runner: macos-14
-            xcode: Xcode_16.1
-          # Don't run new macOS with old Xcode
-          - runner: macos-15
-            xcode: Xcode_15.2
           # Don't run old simulators with new Xcode
           - destination: 'platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (at 1080p)'
             xcode: Xcode_16.1
           - destination: 'platform=iOS Simulator,OS=17.2,name=iPhone 15'
             xcode: Xcode_16.1
           - destination: 'platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro'
             xcode: Xcode_16.1
-          # Don't run new simulators with old Xcode
-          - destination: 'platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (at 1080p)'
-            xcode: Xcode_15.2
-          - destination: 'platform=iOS Simulator,OS=18.1,name=iPhone 16'
-            xcode: Xcode_15.2
-          - destination: 'platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro'
-            xcode: Xcode_15.2
     steps:
       - name: Configure Xcode
         run: |
@@ -77,9 +63,7 @@ jobs:
           NSUnbufferedIO=YES xcodebuild \
             -scheme smithy-swift-Package \
             -destination '${{ matrix.destination }}' \
-            test 2>&1 \
-            | xcbeautify
-
+            test 2>&1
   apple-downstream:
     if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ${{ matrix.runner }}
@@ -91,7 +75,6 @@ jobs:
           - macos-14
           - macos-15
         xcode:
-          - Xcode_15.2
           - Xcode_16.1
         destination:
           - 'platform=iOS Simulator,OS=17.2,name=iPhone 15'
@@ -102,26 +85,13 @@ jobs:
           - 'platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro'
           - 'platform=macOS'
         exclude:
-          # Don't run old macOS with new Xcode
-          - runner: macos-14
-            xcode: Xcode_16.1
-          # Don't run new macOS with old Xcode
-          - runner: macos-15
-            xcode: Xcode_15.2
           # Don't run old simulators with new Xcode
           - destination: 'platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (at 1080p)'
             xcode: Xcode_16.1
           - destination: 'platform=iOS Simulator,OS=17.2,name=iPhone 15'
             xcode: Xcode_16.1
           - destination: 'platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro'
             xcode: Xcode_16.1
-          # Don't run new simulators with old Xcode
-          - destination: 'platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (at 1080p)'
-            xcode: Xcode_15.2
-          - destination: 'platform=iOS Simulator,OS=18.1,name=iPhone 16'
-            xcode: Xcode_15.2
-          - destination: 'platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro'
-            xcode: Xcode_15.2
     steps:
       - name: Configure Xcode
         run: |
@@ -180,7 +150,6 @@ jobs:
           - ubuntu-24.04
           - ubuntu-24.04-arm
         swift:
-          - 5.9-focal
           - 6.0-jammy
     container:
       image: swift:${{ matrix.swift }}
@@ -213,7 +182,6 @@ jobs:
           - ubuntu-24.04
           - ubuntu-24.04-arm
         swift:
-          - 5.9-focal
           - 6.0-jammy
     container:
       image: swift:${{ matrix.swift }}

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.9
+// swift-tools-version:6.0
 
 import Foundation
 import PackageDescription
@@ -56,7 +56,7 @@ let package = Package(
     ],
     dependencies: {
         var dependencies: [Package.Dependency] = [
-            .package(url: "https://github.com/awslabs/aws-crt-swift.git", exact: "0.48.0"),
+            .package(url: "https://github.com/awslabs/aws-crt-swift.git", branch: "swift6-support"),
             .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
         ]
         let isDocCEnabled = ProcessInfo.processInfo.environment["AWS_SWIFT_SDK_ENABLE_DOCC"] != nil
@@ -157,7 +157,10 @@ let package = Package(
         ),
         .target(
             name: "SmithyHTTPAPI",
-            dependencies: ["Smithy"]
+            dependencies: [
+                "Smithy",
+                .product(name: "AwsCommonRuntimeKit", package: "aws-crt-swift")
+            ]
         ),
         .target(
             name: "SmithyHTTPClient",

Sources/ClientRuntime/Config/DefaultSDKRuntimeConfiguration.swift

@@ -131,7 +131,7 @@ public class DefaultAuthSchemeResolverParameters: AuthSchemeResolverParameters {
     }
 }
 
-public class DefaultAuthSchemeResolver: AuthSchemeResolver {
+public final class DefaultAuthSchemeResolver: AuthSchemeResolver, Sendable {
     public func resolveAuthScheme(params: AuthSchemeResolverParameters) throws -> [AuthOption] {
         return []
     }

Sources/ClientRuntime/Config/IdempotencyTokenGenerator.swift

@@ -3,6 +3,6 @@
  * SPDX-License-Identifier: Apache-2.0.
  */
 
-public protocol IdempotencyTokenGenerator {
+public protocol IdempotencyTokenGenerator: Sendable {
     func generateToken() -> String
 }

Sources/ClientRuntime/Endpoints/CRTResolvedEndpoint.swift

@@ -34,7 +34,7 @@ public class CRTResolvedEndpoint {
         }
     }
 
-    public func getProperties() -> [String: AnyHashable]? {
+    public func getProperties() -> [String: EndpointProperty]? {
         switch crtResolvedEndpoint {
         case let .endpoint(_, _, properties):
             return properties

Sources/ClientRuntime/Endpoints/DefaultEndpointResolver.swift

@@ -7,6 +7,7 @@
 
 import struct SmithyHTTPAPI.Endpoint
 import struct SmithyHTTPAPI.Headers
+import enum SmithyHTTPAPI.EndpointPropertyValue
 
 public struct DefaultEndpointResolver<Params: EndpointsRequestContextProviding> {
 
@@ -32,6 +33,6 @@ public struct DefaultEndpointResolver<Params: EndpointsRequestContextProviding>
 
         let headers = crtResolvedEndpoint.getHeaders() ?? [:]
         let properties = crtResolvedEndpoint.getProperties() ?? [:]
-        return try Endpoint(urlString: url, headers: Headers(headers), properties: properties)
+        return try Endpoint(urlString: url, headers: Headers(headers), endpointProperties: properties)
     }
 }

Sources/ClientRuntime/Endpoints/EndpointsAuthSchemeResolver.swift

@@ -5,6 +5,8 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+import enum SmithyHTTPAPI.EndpointPropertyValue
+
 /// Supported authentication schemes
 public enum EndpointsAuthScheme: Equatable {
     case sigV4(SigV4Parameters)
@@ -25,7 +27,8 @@ extension EndpointsAuthScheme {
     /// Initialize an AuthScheme from a dictionary
     /// - Parameter dictionary: Dictionary containing the auth scheme
     public init(from dictionary: [String: Any]) throws {
-        guard let name = dictionary["name"] as? String else {
+        guard let endpointProperty = dictionary["name"] as? SmithyHTTPAPI.EndpointPropertyValue,
+              case let .string(name) = endpointProperty else {
             throw EndpointError.authScheme("Invalid auth scheme")
         }
         switch name {
@@ -60,9 +63,29 @@ extension EndpointsAuthScheme.SigV4Parameters {
     /// Initialize a SigV4AuthScheme from a dictionary
     /// - Parameter dictionary: Dictionary containing the auth scheme
     init(from dictionary: [String: Any]) throws {
-        self.signingName = dictionary["signingName"] as? String
-        self.signingRegion = dictionary["signingRegion"] as? String
-        self.disableDoubleEncoding = dictionary["disableDoubleEncoding"] as? Bool
+        // For signingName (expected to be a string)
+        if let value = dictionary["signingName"] as? EndpointPropertyValue,
+           case let .string(name) = value {
+            self.signingName = name
+        } else {
+            self.signingName = nil
+        }
+
+        // For signingRegion (expected to be a string)
+        if let value = dictionary["signingRegion"] as? EndpointPropertyValue,
+           case let .string(region) = value {
+            self.signingRegion = region
+        } else {
+            self.signingRegion = nil
+        }
+
+        // For disableDoubleEncoding (expected to be a bool)
+        if let value = dictionary["disableDoubleEncoding"] as? EndpointPropertyValue,
+           case let .bool(flag) = value {
+            self.disableDoubleEncoding = flag
+        } else {
+            self.disableDoubleEncoding = nil
+        }
     }
 }
 
@@ -86,9 +109,34 @@ extension EndpointsAuthScheme.SigV4AParameters {
     /// Initialize a SigV4AAuthScheme from a dictionary
     /// - Parameter dictionary: Dictionary containing the auth scheme
     init(from dictionary: [String: Any]) throws {
-        self.signingName = dictionary["signingName"] as? String
-        self.signingRegionSet = dictionary["signingRegionSet"] as? [String]
-        self.disableDoubleEncoding = dictionary["disableDoubleEncoding"] as? Bool
+        // Extract signingName
+        if let value = dictionary["signingName"] as? EndpointPropertyValue,
+           case let .string(name) = value {
+            self.signingName = name
+        } else {
+            self.signingName = nil
+        }
+
+        // Extract signingRegionSet as an array of String
+        if let value = dictionary["signingRegionSet"] as? EndpointPropertyValue,
+           case let .array(regions) = value {
+            self.signingRegionSet = regions.compactMap { element in
+                if case let .string(region) = element {
+                    return region
+                }
+                return nil
+            }
+        } else {
+            self.signingRegionSet = nil
+        }
+
+        // Extract disableDoubleEncoding
+        if let value = dictionary["disableDoubleEncoding"] as? EndpointPropertyValue,
+           case let .bool(flag) = value {
+            self.disableDoubleEncoding = flag
+        } else {
+            self.disableDoubleEncoding = nil
+        }
     }
 }