feat: add glacier header (#327)

Author: kneekey23

codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/customization/glacier/GlacierAddVersionHeader.kt

@@ -0,0 +1,30 @@
+package software.amazon.smithy.aws.swift.codegen.customization.glacier
+
+import software.amazon.smithy.aws.swift.codegen.middleware.MutateHeadersMiddleware
+import software.amazon.smithy.aws.swift.codegen.sdkId
+import software.amazon.smithy.model.Model
+import software.amazon.smithy.model.shapes.ServiceShape
+import software.amazon.smithy.swift.codegen.SwiftSettings
+import software.amazon.smithy.swift.codegen.integration.OperationMiddlewareRenderable
+import software.amazon.smithy.swift.codegen.integration.ProtocolGenerator
+import software.amazon.smithy.swift.codegen.integration.SwiftIntegration
+import software.amazon.smithy.swift.codegen.model.expectShape
+
+/**
+ * Adds a middleware that sets the "X-Amz-Glacier-Version" header to the service model version for all requests
+ * See https://docs.aws.amazon.com/amazonglacier/latest/dev/api-common-request-headers.html
+ */
+class GlacierAddVersionHeader : SwiftIntegration {
+
+    override fun enabledForService(model: Model, settings: SwiftSettings) =
+        model.expectShape<ServiceShape>(settings.service).sdkId.equals("Glacier", ignoreCase = true)
+
+    override fun customizeMiddleware(
+        ctx: ProtocolGenerator.GenerationContext,
+        resolved: List<OperationMiddlewareRenderable>
+    ) = resolved + MutateHeadersMiddleware(
+        extraHeaders = mapOf(
+            "X-Amz-Glacier-Version" to ctx.model.expectShape<ServiceShape>(ctx.settings.service).version
+        )
+    )
+}

codegen/smithy-aws-swift-codegen/src/main/resources/META-INF/services/software.amazon.smithy.swift.codegen.integration.SwiftIntegration

@@ -1,3 +1,4 @@
 software.amazon.smithy.aws.swift.codegen.AddProtocols
 software.amazon.smithy.aws.swift.codegen.customization.s3.S3SigningConfig
-software.amazon.smithy.aws.swift.codegen.customization.apigateway.ApiGatewayAddAcceptHeader
+software.amazon.smithy.aws.swift.codegen.customization.apigateway.ApiGatewayAddAcceptHeader
+software.amazon.smithy.aws.swift.codegen.customization.glacier.GlacierAddVersionHeader