fix access_key NOT FOUND bug and nat_gateway diff bug (#15050)

builtin/providers/alicloud/provider.go

@@ -5,6 +5,7 @@ import (
 	"github.com/hashicorp/terraform/helper/mutexkv"
 	"github.com/hashicorp/terraform/helper/schema"
 	"github.com/hashicorp/terraform/terraform"
+	"os"
 )
 
 // Provider returns a schema.Provider for alicloud
@@ -67,10 +68,26 @@ func Provider() terraform.ResourceProvider {
 }
 
 func providerConfigure(d *schema.ResourceData) (interface{}, error) {
+	accesskey, ok := d.GetOk("access_key")
+	if !ok {
+		accesskey = os.Getenv("ALICLOUD_ACCESS_KEY")
+	}
+	secretkey, ok := d.GetOk("secret_key")
+	if !ok {
+		secretkey = os.Getenv("ALICLOUD_SECRET_KEY")
+	}
+	region, ok := d.GetOk("region")
+	if !ok {
+		region = os.Getenv("ALICLOUD_REGION")
+		if region == "" {
+			region = DEFAULT_REGION
+		}
+	}
+
 	config := Config{
-		AccessKey: d.Get("access_key").(string),
-		SecretKey: d.Get("secret_key").(string),
-		Region:    common.Region(d.Get("region").(string)),
+		AccessKey: accesskey.(string),
+		SecretKey: secretkey.(string),
+		Region:    common.Region(region.(string)),
 	}
 
 	client, err := config.Client()

builtin/providers/alicloud/resource_alicloud_nat_gateway.go

@@ -70,6 +70,7 @@ func resourceAliyunNatGateway() *schema.Resource {
 						"zone": &schema.Schema{
 							Type:     schema.TypeString,
 							Optional: true,
+							Computed: true,
 						},
 						"public_ip_addresses": &schema.Schema{
 							Type:     schema.TypeString,