providers/heroku: import heroku_app resource (#14248)

Adds support for importing normal and organization apps with the
heroku_app resource.

The resource itself depends on an `organization` value in the
configuration to switch behavior for the different kinds of apps, so
`schema.ImportStatePassthrough` is not sufficient.

builtin/providers/heroku/import_heroku_app_test.go

@@ -0,0 +1,58 @@
+package heroku
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/hashicorp/terraform/helper/acctest"
+	"github.com/hashicorp/terraform/helper/resource"
+)
+
+func TestAccHerokuApp_importBasic(t *testing.T) {
+	appName := fmt.Sprintf("tftest-%s", acctest.RandString(10))
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckHerokuAppDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccCheckHerokuAppConfig_basic(appName),
+			},
+			{
+				ResourceName:            "heroku_app.foobar",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"config_vars"},
+			},
+		},
+	})
+}
+
+func TestAccHerokuApp_importOrganization(t *testing.T) {
+	appName := fmt.Sprintf("tftest-%s", acctest.RandString(10))
+	org := os.Getenv("HEROKU_ORGANIZATION")
+
+	resource.Test(t, resource.TestCase{
+		PreCheck: func() {
+			testAccPreCheck(t)
+			if org == "" {
+				t.Skip("HEROKU_ORGANIZATION is not set; skipping test.")
+			}
+		},
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckHerokuAppDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccCheckHerokuAppConfig_organization(appName, org),
+			},
+			{
+				ResourceName:            "heroku_app.foobar",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"config_vars"},
+			},
+		},
+	})
+}

builtin/providers/heroku/resource_heroku_app.go

@@ -100,6 +100,10 @@ func resourceHerokuApp() *schema.Resource {
 		Update: resourceHerokuAppUpdate,
 		Delete: resourceHerokuAppDelete,
 
+		Importer: &schema.ResourceImporter{
+			State: resourceHerokuAppImport,
+		},
+
 		Schema: map[string]*schema.Schema{
 			"name": {
 				Type:     schema.TypeString,
@@ -193,6 +197,24 @@ func isOrganizationApp(d *schema.ResourceData) bool {
 	return len(v) > 0 && v[0] != nil
 }
 
+func resourceHerokuAppImport(d *schema.ResourceData, m interface{}) ([]*schema.ResourceData, error) {
+	client := m.(*heroku.Service)
+
+	app, err := client.AppInfo(context.TODO(), d.Id())
+	if err != nil {
+		return nil, err
+	}
+
+	// Flag organization apps by setting the organization name
+	if app.Organization != nil {
+		d.Set("organization", []map[string]interface{}{
+			{"name": app.Organization.Name},
+		})
+	}
+
+	return []*schema.ResourceData{d}, nil
+}
+
 func switchHerokuAppCreate(d *schema.ResourceData, meta interface{}) error {
 	if isOrganizationApp(d) {
 		return resourceHerokuOrgAppCreate(d, meta)