d/aws_servicecatalogappregistry_application: new data source (#36596)

This data source will allow practitioners to retreive AWS Service Catalog AppRegistry application data via Terraform.

```console
% make testacc PKG=servicecatalogappregistry TESTS=TestAccServiceCatalogAppRegistryApplicationDataSource_
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.21.8 test ./internal/service/servicecatalogappregistry/... -v -count 1 -parallel 20 -run='TestAccServiceCatalogAppRegistryApplicationDataSource_'  -timeout 360m

--- PASS: TestAccServiceCatalogAppRegistryApplicationDataSource_basic (10.84s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/servicecatalogappregistry  16.390s
```

.changelog/36596.txt

@@ -0,0 +1,3 @@
+```release-note:new-data-source
+aws_servicecatalogappregistry_application
+```

internal/service/servicecatalogappregistry/application_data_source.go

@@ -0,0 +1,78 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package servicecatalogappregistry
+
+import (
+	"context"
+
+	"github.com/hashicorp/terraform-plugin-framework/datasource"
+	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/types"
+	"github.com/hashicorp/terraform-provider-aws/internal/create"
+	"github.com/hashicorp/terraform-provider-aws/internal/framework"
+	"github.com/hashicorp/terraform-provider-aws/internal/framework/flex"
+	"github.com/hashicorp/terraform-provider-aws/names"
+)
+
+// @FrameworkDataSource(name="Application")
+func newDataSourceApplication(context.Context) (datasource.DataSourceWithConfigure, error) {
+	return &dataSourceApplication{}, nil
+}
+
+const (
+	DSNameApplication = "Application Data Source"
+)
+
+type dataSourceApplication struct {
+	framework.DataSourceWithConfigure
+}
+
+func (d *dataSourceApplication) Metadata(_ context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) { // nosemgrep:ci.meta-in-func-name
+	resp.TypeName = "aws_servicecatalogappregistry_application"
+}
+
+func (d *dataSourceApplication) Schema(ctx context.Context, req datasource.SchemaRequest, resp *datasource.SchemaResponse) {
+	resp.Schema = schema.Schema{
+		Attributes: map[string]schema.Attribute{
+			"arn": framework.ARNAttributeComputedOnly(),
+			"description": schema.StringAttribute{
+				Computed: true,
+			},
+			"id": schema.StringAttribute{
+				Required: true,
+			},
+			"name": schema.StringAttribute{
+				Computed: true,
+			},
+		},
+	}
+}
+func (d *dataSourceApplication) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
+	conn := d.Meta().ServiceCatalogAppRegistryClient(ctx)
+
+	var data dataSourceApplicationData
+	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	out, err := findApplicationByID(ctx, conn, data.ID.ValueString())
+	if err != nil {
+		resp.Diagnostics.AddError(
+			create.ProblemStandardMessage(names.ServiceCatalogAppRegistry, create.ErrActionSetting, ResNameApplication, data.ID.String(), err),
+			err.Error(),
+		)
+		return
+	}
+
+	resp.Diagnostics.Append(flex.Flatten(ctx, out, &data)...)
+	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
+}
+
+type dataSourceApplicationData struct {
+	ARN         types.String `tfsdk:"arn"`
+	Description types.String `tfsdk:"description"`
+	ID          types.String `tfsdk:"id"`
+	Name        types.String `tfsdk:"name"`
+}

internal/service/servicecatalogappregistry/application_data_source_test.go

@@ -0,0 +1,54 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package servicecatalogappregistry_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/YakDriver/regexache"
+	sdkacctest "github.com/hashicorp/terraform-plugin-testing/helper/acctest"
+	"github.com/hashicorp/terraform-plugin-testing/helper/resource"
+	"github.com/hashicorp/terraform-provider-aws/internal/acctest"
+	"github.com/hashicorp/terraform-provider-aws/names"
+)
+
+func TestAccServiceCatalogAppRegistryApplicationDataSource_basic(t *testing.T) {
+	ctx := acctest.Context(t)
+	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
+	dataSourceName := "data.aws_servicecatalogappregistry_application.test"
+	applicationResourceName := "aws_servicecatalogappregistry_application.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck: func() {
+			acctest.PreCheck(ctx, t)
+			acctest.PreCheckPartitionHasService(t, names.ServiceCatalogAppRegistryEndpointID)
+		},
+		ErrorCheck:               acctest.ErrorCheck(t, names.ServiceCatalogAppRegistryServiceID),
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories,
+		CheckDestroy:             testAccCheckApplicationDestroy(ctx),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccApplicationDataSourceConfig_basic(rName),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttrPair(dataSourceName, "id", applicationResourceName, "id"),
+					resource.TestCheckResourceAttr(dataSourceName, "name", rName),
+					acctest.MatchResourceAttrRegionalARN(dataSourceName, "arn", "servicecatalog", regexache.MustCompile(`/applications/+.`)),
+				),
+			},
+		},
+	})
+}
+
+func testAccApplicationDataSourceConfig_basic(rName string) string {
+	return fmt.Sprintf(`
+resource "aws_servicecatalogappregistry_application" "test" {
+  name = %[1]q
+}
+
+data "aws_servicecatalogappregistry_application" "test" {
+  id = aws_servicecatalogappregistry_application.test.id
+}
+`, rName)
+}

website/docs/d/servicecatalogappregistry_application.html.markdown

@@ -0,0 +1,35 @@
+---
+subcategory: "Service Catalog AppRegistry"
+layout: "aws"
+page_title: "AWS: aws_servicecatalogappregistry_application"
+description: |-
+  Terraform data source for managing an AWS Service Catalog AppRegistry Application.
+---
+
+# Data Source: aws_servicecatalogappregistry_application
+
+Terraform data source for managing an AWS Service Catalog AppRegistry Application.
+
+## Example Usage
+
+### Basic Usage
+
+```terraform
+data "aws_servicecatalogappregistry_application" "example" {
+  id = "application-1234"
+}
+```
+
+## Argument Reference
+
+The following arguments are required:
+
+* `id` - (Required) Application identifier.
+
+## Attribute Reference
+
+This data source exports the following attributes in addition to the arguments above:
+
+* `arn` - ARN (Amazon Resource Name) of the application.
+* `description` - Description of the application.
+* `name` - Name of the application.