data-source/aws_prefix_list: Using name argument no longer override…

…s other arguments (#16739)

Output from acceptance testing in AWS Commercial:

```
--- PASS: TestAccDataSourceAwsPrefixList_nameDoesNotOverrideFilter (2.68s)
--- PASS: TestAccDataSourceAwsPrefixList_basic (12.81s)
--- PASS: TestAccDataSourceAwsPrefixList_filter (12.83s)
```

Output from acceptance testing in AWS GovCloud (US):

```
--- PASS: TestAccDataSourceAwsPrefixList_nameDoesNotOverrideFilter (1.60s)
--- PASS: TestAccDataSourceAwsPrefixList_filter (7.48s)
--- PASS: TestAccDataSourceAwsPrefixList_basic (7.61s)
```

aws/data_source_aws_prefix_list.go

@@ -45,11 +45,12 @@ func dataSourceAwsPrefixListRead(d *schema.ResourceData, meta interface{}) error
 	if prefixListID := d.Get("prefix_list_id"); prefixListID != "" {
 		req.PrefixListIds = aws.StringSlice([]string{prefixListID.(string)})
 	}
-	req.Filters = buildEC2AttributeFilterList(
-		map[string]string{
-			"prefix-list-name": d.Get("name").(string),
-		},
-	)
+	if prefixListName := d.Get("name"); prefixListName.(string) != "" {
+		req.Filters = append(req.Filters, &ec2.Filter{
+			Name:   aws.String("prefix-list-name"),
+			Values: aws.StringSlice([]string{prefixListName.(string)}),
+		})
+	}
 
 	log.Printf("[DEBUG] Reading Prefix List: %s", req)
 	resp, err := conn.DescribePrefixLists(req)

aws/data_source_aws_prefix_list_test.go

@@ -2,9 +2,12 @@ package aws
 
 import (
 	"fmt"
+	"regexp"
 	"strconv"
 	"testing"
 
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
 )
@@ -41,7 +44,41 @@ func TestAccDataSourceAwsPrefixList_filter(t *testing.T) {
 	})
 }
 
+func TestAccDataSourceAwsPrefixList_nameDoesNotOverrideFilter(t *testing.T) {
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		Steps: []resource.TestStep{
+			{
+				Config:      testAccDataSourceAwsPrefixListConfig_nameDoesNotOverrideFilter,
+				ExpectError: regexp.MustCompile(`no matching prefix list found`),
+			},
+		},
+	})
+}
+
 func testAccDataSourceAwsPrefixListCheck(name string) resource.TestCheckFunc {
+	getPrefixListId := func(name string) (string, error) {
+		conn := testAccProvider.Meta().(*AWSClient).ec2conn
+
+		input := ec2.DescribePrefixListsInput{
+			Filters: buildEC2AttributeFilterList(map[string]string{
+				"prefix-list-name": name,
+			}),
+		}
+
+		output, err := conn.DescribePrefixLists(&input)
+		if err != nil {
+			return "", err
+		}
+
+		if len(output.PrefixLists) != 1 {
+			return "", fmt.Errorf("prefix list %s not found", name)
+		}
+
+		return aws.StringValue(output.PrefixLists[0].PrefixListId), nil
+	}
+
 	return func(s *terraform.State) error {
 		rs, ok := s.RootModule().Resources[name]
 		if !ok {
@@ -50,17 +87,21 @@ func testAccDataSourceAwsPrefixListCheck(name string) resource.TestCheckFunc {
 
 		attr := rs.Primary.Attributes
 
-		if attr["name"] != "com.amazonaws.us-west-2.s3" {
+		region := testAccGetRegion()
+		prefixListName := fmt.Sprintf("com.amazonaws.%s.s3", region)
+		prefixListId, err := getPrefixListId(prefixListName)
+		if err != nil {
+			return err
+		}
+
+		if attr["name"] != prefixListName {
 			return fmt.Errorf("bad name %s", attr["name"])
 		}
-		if attr["id"] != "pl-68a54001" {
+		if attr["id"] != prefixListId {
 			return fmt.Errorf("bad id %s", attr["id"])
 		}
 
-		var (
-			cidrBlockSize int
-			err           error
-		)
+		var cidrBlockSize int
 
 		if cidrBlockSize, err = strconv.Atoi(attr["cidr_blocks.#"]); err != nil {
 			return err
@@ -74,27 +115,44 @@ func testAccDataSourceAwsPrefixListCheck(name string) resource.TestCheckFunc {
 }
 
 const testAccDataSourceAwsPrefixListConfig = `
+data "aws_region" "current" {}
+
 data "aws_prefix_list" "s3_by_id" {
-  prefix_list_id = "pl-68a54001"
+  prefix_list_id = data.aws_prefix_list.s3_by_name.id
 }
 
 data "aws_prefix_list" "s3_by_name" {
-  name = "com.amazonaws.us-west-2.s3"
+  name = "com.amazonaws.${data.aws_region.current.name}.s3"
 }
 `
 
 const testAccDataSourceAwsPrefixListConfigFilter = `
+data "aws_region" "current" {}
+
 data "aws_prefix_list" "s3_by_name" {
   filter {
     name   = "prefix-list-name"
-    values = ["com.amazonaws.us-west-2.s3"]
+    values = ["com.amazonaws.${data.aws_region.current.name}.s3"]
   }
 }
 
 data "aws_prefix_list" "s3_by_id" {
   filter {
     name   = "prefix-list-id"
-    values = ["pl-68a54001"]
+    values = [data.aws_prefix_list.s3_by_name.id]
+  }
+}
+`
+
+const testAccDataSourceAwsPrefixListConfig_nameDoesNotOverrideFilter = `
+data "aws_region" "current" {}
+
+data "aws_prefix_list" "test" {
+  name = "com.amazonaws.${data.aws_region.current.name}.dynamodb"
+
+  filter {
+    name   = "prefix-list-name"
+    values = ["com.amazonaws.${data.aws_region.current.name}.s3"]
   }
 }
 `

website/docs/d/prefix_list.html.markdown

@@ -1,7 +1,7 @@
 ---
 subcategory: "VPC"
 layout: "aws"
-page_title: "AWS: aws_prefix-list"
+page_title: "AWS: aws_prefix_list"
 description: |-
     Provides details about a specific prefix list
 ---