api/v3: Add feature type to API feature

API now returns every feature found by the detectors and also indicates
the type of feature.

api/v3/clairpb/clair.proto

@@ -80,6 +80,9 @@ message Feature {
   Detector detector = 5;
   // The list of vulnerabilities that affect the feature.
   repeated Vulnerability vulnerabilities = 6;
+  // The feature type indicates if the feature represents a source package or
+  // binary package.
+  string feature_type = 7;
 }
 
 message Layer {

api/v3/clairpb/clair.swagger.json

@@ -330,6 +330,10 @@
             "$ref": "#/definitions/clairVulnerability"
           },
           "description": "The list of vulnerabilities that affect the feature."
+        },
+        "feature_type": {
+          "type": "string",
+          "description": "The feature type indicates if the feature represents a source package or\nbinary package."
         }
       }
     },

api/v3/clairpb/convert.go

@@ -99,6 +99,7 @@ func NotificationFromDatabaseModel(dbNotification database.VulnerabilityNotifica
 	return &noti, nil
 }
 
+// VulnerabilityFromDatabaseModel converts database Vulnerability to api Vulnerability.
 func VulnerabilityFromDatabaseModel(dbVuln database.Vulnerability) (*Vulnerability, error) {
 	metaString := ""
 	if dbVuln.Metadata != nil {
@@ -119,6 +120,7 @@ func VulnerabilityFromDatabaseModel(dbVuln database.Vulnerability) (*Vulnerabili
 	}, nil
 }
 
+// VulnerabilityWithFixedInFromDatabaseModel converts database VulnerabilityWithFixedIn to api Vulnerability.
 func VulnerabilityWithFixedInFromDatabaseModel(dbVuln database.VulnerabilityWithFixedIn) (*Vulnerability, error) {
 	vuln, err := VulnerabilityFromDatabaseModel(dbVuln.Vulnerability)
 	if err != nil {
@@ -145,9 +147,11 @@ func NamespacedFeatureFromDatabaseModel(feature database.AncestryFeature) *Featu
 		VersionFormat: feature.Namespace.VersionFormat,
 		Version:       version,
 		Detector:      DetectorFromDatabaseModel(feature.FeatureBy),
+		FeatureType:   string(feature.Type),
 	}
 }
 
+// DetectorFromDatabaseModel converts database detector to api detector.
 func DetectorFromDatabaseModel(detector database.Detector) *Detector {
 	return &Detector{
 		Name:    detector.Name,
@@ -156,6 +160,7 @@ func DetectorFromDatabaseModel(detector database.Detector) *Detector {
 	}
 }
 
+// DetectorsFromDatabaseModel converts database detectors to api detectors.
 func DetectorsFromDatabaseModel(dbDetectors []database.Detector) []*Detector {
 	detectors := make([]*Detector, 0, len(dbDetectors))
 	for _, d := range dbDetectors {