chore(codegen): add sigv4a trait detection (#5850)

* chore(codegen): add sigv4a trait detection

* chore: no need to check operations for sigv4a

* chore: import ordering

* chore: add id&auth settings matcher to sigv4a plugin

Author: kuhe

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/AddSigv4aPlugin.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package software.amazon.smithy.aws.typescript.codegen;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.function.Consumer;
+import software.amazon.smithy.aws.traits.auth.SigV4ATrait;
+import software.amazon.smithy.codegen.core.SymbolProvider;
+import software.amazon.smithy.model.Model;
+import software.amazon.smithy.model.knowledge.ServiceIndex;
+import software.amazon.smithy.typescript.codegen.LanguageTarget;
+import software.amazon.smithy.typescript.codegen.TypeScriptSettings;
+import software.amazon.smithy.typescript.codegen.TypeScriptWriter;
+import software.amazon.smithy.typescript.codegen.integration.TypeScriptIntegration;
+import software.amazon.smithy.utils.MapUtils;
+import software.amazon.smithy.utils.SmithyInternalApi;
+
+/**
+ * Detects when to add sigv4a signer.
+ */
+@SmithyInternalApi
+public final class AddSigv4aPlugin implements TypeScriptIntegration {
+
+    @Override
+    public boolean matchesSettings(TypeScriptSettings settings) {
+        return !settings.getExperimentalIdentityAndAuth();
+    }
+
+    public Map<String, Consumer<TypeScriptWriter>> getRuntimeConfigWriters(
+        TypeScriptSettings settings,
+        Model model,
+        SymbolProvider symbolProvider,
+        LanguageTarget target
+    ) {
+        final boolean addSigv4aSignerToConfig = ServiceIndex.of(model)
+            .getEffectiveAuthSchemes(settings.getService(), ServiceIndex.AuthSchemeMode.NO_AUTH_AWARE)
+            .containsKey(SigV4ATrait.ID);
+
+        // the sigv4a trait also appears on operations, but we will not check
+        // them individually because it must appear on the service as well in that case.
+
+        if (!addSigv4aSignerToConfig) {
+            return Collections.emptyMap();
+        }
+
+        // TODO: add to shared config when sigv4a implementation is available in browser.
+        switch (target) {
+            case NODE:
+                return MapUtils.of("signerConstructor", writer -> {
+                    writer
+                        .addDependency(AwsDependency.SIGNATURE_V4_MULTIREGION)
+                        .addImport("SignatureV4MultiRegion", null, AwsDependency.SIGNATURE_V4_MULTIREGION)
+                        .write("SignatureV4MultiRegion");
+                });
+            default:
+                return Collections.emptyMap();
+        }
+    }
+}

codegen/smithy-aws-typescript-codegen/src/main/resources/META-INF/services/software.amazon.smithy.typescript.codegen.integration.TypeScriptIntegration

@@ -24,6 +24,7 @@ software.amazon.smithy.aws.typescript.codegen.AddDocumentClientPlugin
 software.amazon.smithy.aws.typescript.codegen.AddEndpointDiscoveryPlugin
 software.amazon.smithy.aws.typescript.codegen.AddHttpChecksumDependency
 software.amazon.smithy.aws.typescript.codegen.AddEventBridgePlugin
+software.amazon.smithy.aws.typescript.codegen.AddSigv4aPlugin
 software.amazon.smithy.aws.typescript.codegen.AddCloudFrontKeyValueStorePlugin
 software.amazon.smithy.aws.typescript.codegen.auth.http.integration.AwsSdkCustomizeHttpBearerTokenAuth
 software.amazon.smithy.aws.typescript.codegen.auth.http.integration.SupportSigV4Auth