Lesson 35 - Get Compute Auth Token Working

Plugins/GameLiftPlugin/Source/AWSSDK/Include/smithy/identity/signer/AwsSignerBase.h

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+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+
+#include <atomic>
+#include <smithy/identity/identity/AwsIdentity.h>
+
+#include <aws/crt/Variant.h>
+#include <aws/core/client/AWSError.h>
+#include <aws/core/http/HttpRequest.h>
+#include <aws/core/utils/FutureOutcome.h>
+#include <aws/core/utils/memory/stl/AWSMap.h>
+
+
+namespace smithy {
+    class AwsSignerCommon {
+    public:
+        virtual ~AwsSignerCommon() = default;
+        /**
+         * This handles detection of clock skew between clients and the server and adjusts the clock so that the next request will not
+         * fail on the timestamp check.
+         */
+        virtual void SetClockSkew(const std::chrono::milliseconds& clockSkew) { m_clockSkew = clockSkew; }
+        /**
+         * Gets the timestamp being used by the signer. This may include a clock skew if a clock skew has been detected.
+         */
+        virtual Aws::Utils::DateTime GetSigningTimestamp() const { return Aws::Utils::DateTime::Now() + GetClockSkewOffset(); }
+
+    protected:
+        virtual std::chrono::milliseconds GetClockSkewOffset() const { return m_clockSkew.load(); }
+        std::atomic<std::chrono::milliseconds> m_clockSkew = {};
+    };
+
+    template<typename IDENTITY_T>
+    class AwsSignerBase : public AwsSignerCommon {
+    public:
+        using IdentityT = IDENTITY_T;
+        static_assert(std::is_base_of<AwsIdentity, IDENTITY_T>::value, "Identity type should inherit AwsIdentity");
+        using SigningProperties = Aws::UnorderedMap<Aws::String, Aws::Crt::Variant<Aws::String, bool>>;
+        using AdditionalParameters = Aws::UnorderedMap<Aws::String, Aws::Crt::Variant<Aws::String, bool>>;
+        using HttpRequest = Aws::Http::HttpRequest;
+        using SigningError = Aws::Client::AWSError<Aws::Client::CoreErrors>;
+        using SigningFutureOutcome = Aws::Utils::FutureOutcome<std::shared_ptr<HttpRequest>, SigningError>;
+
+        // signer may copy the original httpRequest or create a new one
+        virtual SigningFutureOutcome sign(std::shared_ptr<HttpRequest> httpRequest, const IdentityT& identity, SigningProperties properties) = 0;
+
+        virtual ~AwsSignerBase() {};
+    };
+}