Add validation for dataset type

The valid dataset types at the moment are logs and metrics.

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Generate index.json file. [#470](https://github.com/elastic/package-registry/pull/470)
 * Stream archived package content. [#472](https://github.com/elastic/package-registry/pull/472)
 * Generate package index.json files. [#479](https://github.com/elastic/package-registry/pull/479)
+* Add validation for dataset type. [#](https://github.com/elastic/package-registry/pull/)
 
 ### Deprecated
 

util/dataset.go

@@ -24,6 +24,11 @@ const (
 	DirIngestPipeline = "ingest-pipeline"
 )
 
+var ValidTypes = map[string]interface{}{
+	"logs":    nil,
+	"metrics": nil,
+}
+
 type DataSet struct {
 	ID             string   `config:"id" json:"id,omitempty" yaml:"id,omitempty"`
 	Title          string   `config:"title" json:"title" validate:"required"`
@@ -140,6 +145,10 @@ func (d *DataSet) Validate() error {
 		return fmt.Errorf("dataset name is not allowed to contain `-`: %s", d.ID)
 	}
 
+	if !d.ValidType() {
+		return fmt.Errorf("type is not valid: %s", d.Type)
+	}
+
 	if d.IngestPipeline == "" {
 		// Check that no ingest pipeline exists in the directory except default
 		for _, path := range paths {
@@ -191,6 +200,11 @@ func (d *DataSet) Validate() error {
 	return nil
 }
 
+func (d *DataSet) ValidType() bool {
+	_, exists := ValidTypes[d.Type]
+	return exists
+}
+
 func validateIngestPipelineFile(pipelinePath string) error {
 	f, err := ioutil.ReadFile(pipelinePath)
 	if err != nil {