fix: apk package lookup for ecosyste.ms doesn't use the namespace (#40)

* fix: apk package lookup for ecosyste.ms doesn't use the namespace

* refactor: fixed typo, break in apk case

---------

Co-authored-by: Maximilian Combüchen <max.combuchen@snyk.io>

lib/ecosystems/package.go

@@ -79,15 +79,20 @@ func purlToEcosystemsName(purl packageurl.PackageURL) string {
 	default:
 		name = fmt.Sprintf("%s/%s", purl.Namespace, purl.Name)
 
-	// Ecosystem maven requires the group ID and artifact ID to be separated
+	// ecosyste.ms maven requires the group ID and artifact ID to be separated
 	// by a colon ":",
 	case packageurl.TypeMaven:
 		name = fmt.Sprintf("%s:%s", purl.Namespace, purl.Name)
 
-	// Ecosystem npm requires the combination of namespace and name to
+	// ecosyste.ms npm requires the combination of namespace and name to
 	// be URL-encoded, including the separator.
 	case packageurl.TypeNPM:
 		name = url.QueryEscape(fmt.Sprintf("%s/%s", purl.Namespace, purl.Name))
+
+	// apk packages are only used by alpine, so the namespace isn't used in the
+	// package name for the ecosyste.ms API
+	case packageurl.TypeApk:
+		break
 	}
 
 	return name

lib/ecosystems/package_test.go

@@ -132,6 +132,11 @@ func TestPurlToEcosystemsName(t *testing.T) {
 			purlStr:      "pkg:swift/github.com/yonaskolb/XcodeGen@1",
 			expectedName: "github.com/yonaskolb/XcodeGen",
 		},
+		{
+			// Test case 8: When the package manager type is "apk"
+			purlStr:      "pkg:apk/alpine/lf@30-r3",
+			expectedName: "lf",
+		},
 	}
 
 	for _, testCase := range testCases {