Support features in App spec

digitalocean/app/app_spec.go

@@ -41,6 +41,12 @@ func appSpecSchema(isResource bool) map[string]*schema.Schema {
 			Computed: true,
 			Elem:     appSpecDomainSchema(),
 		},
+		"features": {
+			Type:        schema.TypeSet,
+			Optional:    true,
+			Elem:        &schema.Schema{Type: schema.TypeString},
+			Description: "List of features which is applied to the app",
+		},
 		"domains": {
 			Type:       schema.TypeSet,
 			Optional:   true,
@@ -1003,6 +1009,7 @@ func expandAppSpec(config []interface{}) *godo.AppSpec {
 	appSpec := &godo.AppSpec{
 		Name:        appSpecConfig["name"].(string),
 		Region:      appSpecConfig["region"].(string),
+		Features:    expandAppSpecFeatures(appSpecConfig["features"].(*schema.Set)),
 		Services:    expandAppSpecServices(appSpecConfig["service"].([]interface{})),
 		StaticSites: expandAppSpecStaticSites(appSpecConfig["static_site"].([]interface{})),
 		Workers:     expandAppSpecWorkers(appSpecConfig["worker"].([]interface{})),
@@ -1033,6 +1040,7 @@ func flattenAppSpec(d *schema.ResourceData, spec *godo.AppSpec) []map[string]int
 		r := make(map[string]interface{})
 		r["name"] = (*spec).Name
 		r["region"] = (*spec).Region
+		r["features"] = (*spec).Features
 
 		if len((*spec).Domains) > 0 {
 			r["domains"] = flattenAppDomainSpec((*spec).Domains)
@@ -1712,6 +1720,18 @@ func flattenAppSpecStaticSites(sites []*godo.AppStaticSiteSpec) []map[string]int
 	return result
 }
 
+func expandAppSpecFeatures(featuresConfig *schema.Set) []string {
+	features := []string{}
+
+	for _, feature := range featuresConfig.List() {
+		if featureString, ok := feature.(string); ok {
+			features = append(features, featureString)
+		}
+	}
+
+	return features
+}
+
 func expandAppSpecWorkers(config []interface{}) []*godo.AppWorkerSpec {
 	appWorkers := make([]*godo.AppWorkerSpec, 0, len(config))
 

digitalocean/app/resource_app_test.go

@@ -853,6 +853,27 @@ func testAccCheckDigitalOceanAppExists(n string, app *godo.App) resource.TestChe
 	}
 }
 
+func TestAccDigitalOceanApp_Features(t *testing.T) {
+	var app godo.App
+	appName := acceptance.RandomTestName()
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { acceptance.TestAccPreCheck(t) },
+		Providers:    acceptance.TestAccProviders,
+		CheckDestroy: testAccCheckDigitalOceanAppDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: fmt.Sprintf(testAccCheckDigitalOceanAppConfig_withFeatures, appName),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckDigitalOceanAppExists("digitalocean_app.foobar", &app),
+					resource.TestCheckResourceAttr(
+						"digitalocean_app.foobar", "spec.0.features.0", "buildpack-stack=ubuntu-18"),
+				),
+			},
+		},
+	})
+}
+
 var testAccCheckDigitalOceanAppConfig_basic = `
 resource "digitalocean_app" "foobar" {
   spec {
@@ -918,6 +939,25 @@ resource "digitalocean_app" "foobar" {
   }
 }`
 
+var testAccCheckDigitalOceanAppConfig_withFeatures = `
+resource "digitalocean_app" "foobar" {
+  spec {
+    name   = "%s"
+    region = "ams"
+	features = ["buildpack-stack=ubuntu-18"]
+
+    service {
+      name               = "go-service-with-features"
+      instance_size_slug = "basic-xxs"
+
+      git {
+        repo_clone_url = "https://github.com/digitalocean/sample-golang.git"
+        branch         = "main"
+      }
+    }
+  }
+}`
+
 var testAccCheckDigitalOceanAppConfig_addService = `
 resource "digitalocean_app" "foobar" {
   spec {

docs/resources/app.md

@@ -158,6 +158,7 @@ The following arguments are supported:
 * `spec` - (Required) A DigitalOcean App spec describing the app.
  - `name` - (Required) The name of the app. Must be unique across all apps in the same account.
  - `region` - The slug for the DigitalOcean data center region hosting the app.
+ - `features` - A list of the features applied to the app. The default buildpack can be overridden here. List of available buildpacks can be found using the [doctl CLI](https://docs.digitalocean.com/reference/doctl/reference/apps/list-buildpacks/)
  - `domain` - Describes a domain where the application will be made available.
      * `name` - The hostname for the domain.
      * `type` - The domain type, which can be one of the following: