project_id validated in datasource

.changelog/6691.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+cloudplatform: Validated `project_id` for `google_project` data-source
+```

google/data_source_google_project.go

@@ -12,6 +12,7 @@ func dataSourceGoogleProject() *schema.Resource {
 
 	addOptionalFieldsToSchema(dsSchema, "project_id")
 
+	dsSchema["project_id"].ValidateFunc = validateDSProjectID()
 	return &schema.Resource{
 		Read:   datasourceGoogleProjectRead,
 		Schema: dsSchema,

google/validation.go

@@ -212,6 +212,20 @@ func validateProjectID() schema.SchemaValidateFunc {
 	}
 }
 
+func validateDSProjectID() schema.SchemaValidateFunc {
+	return func(v interface{}, k string) (ws []string, errors []error) {
+		value := v.(string)
+		ids := strings.Split(value, "/")
+		value = ids[len(ids)-1]
+
+		if !regexp.MustCompile("^" + ProjectRegex + "$").MatchString(value) {
+			errors = append(errors, fmt.Errorf(
+				"%q project_id must be 6 to 30 with lowercase letters, digits, hyphens and start with a letter. Trailing hyphens are prohibited.", value))
+		}
+		return
+	}
+}
+
 func validateProjectName() schema.SchemaValidateFunc {
 	return func(v interface{}, k string) (ws []string, errors []error) {
 		value := v.(string)

google/validation_test.go

@@ -271,6 +271,29 @@ func TestValidateProjectID(t *testing.T) {
 	}
 }
 
+func TestValidateDSProjectID(t *testing.T) {
+	x := []StringValidationTestCase{
+		// No errors
+		{TestName: "basic", Value: "foobar"},
+		{TestName: "with numbers", Value: "foobar123"},
+		{TestName: "short", Value: "foofoo"},
+		{TestName: "long", Value: "foobarfoobarfoobarfoobarfoobar"},
+		{TestName: "has projects", Value: "projects/foo-bar"},
+		{TestName: "has multiple projects", Value: "projects/projects/foobar"},
+		{TestName: "has a hyphen", Value: "foo-bar"},
+
+		// With errors
+		{TestName: "empty", Value: "", ExpectError: true},
+		{TestName: "has an uppercase letter", Value: "foo-Bar", ExpectError: true},
+		{TestName: "has a final hyphen", Value: "foo-bar-", ExpectError: true},
+	}
+
+	es := testStringValidationCases(x, validateDSProjectID())
+	if len(es) > 0 {
+		t.Errorf("Failed to validate project ID's: %v", es)
+	}
+}
+
 func TestValidateProjectName(t *testing.T) {
 	x := []StringValidationTestCase{
 		// No errors