Add requestChecksumCalculation config option

Author: 0marperez

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/core/RuntimeTypes.kt

@@ -231,6 +231,8 @@ object RuntimeTypes {
         object Config : RuntimeTypePackage(KotlinDependency.SMITHY_CLIENT, "config") {
             val RequestCompressionConfig = symbol("RequestCompressionConfig")
             val CompressionClientConfig = symbol("CompressionClientConfig")
+            val HttpChecksumClientConfig = symbol("HttpChecksumClientConfig")
+            val RequestChecksumCalculation = symbol("RequestChecksumCalculation")
         }
 
         object Endpoints : RuntimeTypePackage(KotlinDependency.SMITHY_CLIENT, "endpoints") {

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/rendering/checksums/HttpChecksumIntegration.kt

@@ -0,0 +1,32 @@
+package software.amazon.smithy.kotlin.codegen.rendering.checksums
+
+import software.amazon.smithy.aws.traits.HttpChecksumTrait
+import software.amazon.smithy.kotlin.codegen.KotlinSettings
+import software.amazon.smithy.kotlin.codegen.core.CodegenContext
+import software.amazon.smithy.kotlin.codegen.core.RuntimeTypes
+import software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration
+import software.amazon.smithy.kotlin.codegen.lang.KotlinTypes
+import software.amazon.smithy.kotlin.codegen.model.asNullable
+import software.amazon.smithy.kotlin.codegen.rendering.util.ConfigProperty
+import software.amazon.smithy.kotlin.codegen.rendering.util.nestedBuilder
+import software.amazon.smithy.kotlin.codegen.utils.topDownOperations
+import software.amazon.smithy.model.Model
+
+/**
+ * todo
+ */
+class HttpChecksumIntegration: KotlinIntegration {
+    override fun enabledForService(model: Model, settings: KotlinSettings): Boolean =
+        model.topDownOperations(settings.service).any { it.hasTrait(HttpChecksumTrait::class.java) }
+
+    override fun additionalServiceConfigProps(ctx: CodegenContext): List<ConfigProperty> =
+        listOf(
+            ConfigProperty {
+                name = "requestChecksumCalculation"
+                symbol = RuntimeTypes.SmithyClient.Config.RequestChecksumCalculation
+                baseClass = RuntimeTypes.SmithyClient.Config.HttpChecksumClientConfig
+                useNestedBuilderBaseClass()
+                documentation = "" // todo
+            }
+        )
+}

codegen/smithy-kotlin-codegen/src/main/resources/META-INF/services/software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration

@@ -13,3 +13,4 @@ software.amazon.smithy.kotlin.codegen.rendering.endpoints.SdkEndpointBuiltinInte
 software.amazon.smithy.kotlin.codegen.rendering.compression.RequestCompressionIntegration
 software.amazon.smithy.kotlin.codegen.rendering.auth.SigV4AsymmetricAuthSchemeIntegration
 software.amazon.smithy.kotlin.codegen.rendering.smoketests.SmokeTestsIntegration
+software.amazon.smithy.kotlin.codegen.rendering.checksums.HttpChecksumIntegration

runtime/smithy-client/common/src/aws/smithy/kotlin/runtime/client/config/HttpChecksumClientConfig.kt

@@ -0,0 +1,26 @@
+package aws.smithy.kotlin.runtime.client.config
+
+public interface HttpChecksumClientConfig {
+    /**
+     * todo
+     */
+    public val requestChecksumCalculation: RequestChecksumCalculation?
+
+    public interface Builder {
+        /**
+         * todo
+         */
+        public var requestChecksumCalculation: RequestChecksumCalculation?
+    }
+}
+
+public enum class RequestChecksumCalculation {
+    /**
+     * todo
+     */
+    WHEN_SUPPORTED,
+    /**
+     * todo
+     */
+    WHEN_REQUIRED,
+}