Allow the user to generate a valid iri based on a uuid

atom.go

@@ -1,10 +1,12 @@
 package atom
 
 import (
+	"fmt"
 	"mime"
 	"regexp"
 	"strings"
 
+	"github.com/google/uuid"
 	"golang.org/x/text/language"
 )
 
@@ -61,8 +63,17 @@ func isXMLMediaType(mediaType string) bool {
 // isValidMediaType checks whether a string is a valid media type. It returns a
 // bool.
 func isValidMediaType(mediaType string) bool {
-	_, _, err := mime.ParseMediaType(mediaType)
+	mediaType, _, err := mime.ParseMediaType(mediaType)
-	return err == nil
+	if err != nil {
+		return false
+	}
+
+	typeParts := strings.Split(mediaType, "/")
+	if len(typeParts) != 2 || typeParts[0] == "" || typeParts[1] == "" {
+		return false
+	}
+
+	return true
 }
 
 // isValidLanguageTag checks whether a LanguageTag is valid. It returns a bool.
@@ -70,3 +81,8 @@ func isValidLanguageTag(tag LanguageTag) bool {
 	_, err := language.Parse(string(tag))
 	return err == nil
 }
+
+// NewURN generates an new valid IRI based on a UUID. It returns an IRI.
+func NewURN() IRI {
+	return IRI(fmt.Sprint("urn:uuid:", uuid.New()))
+}

id.go

@@ -3,8 +3,6 @@ package atom
 import (
 	"errors"
 	"fmt"
-
-	"github.com/google/uuid"
 )
 
 type ID struct {
@@ -13,8 +11,8 @@ type ID struct {
 }
 
 // NewID creates a new ID. It returns a *ID.
-func NewID() *ID {
+func NewID(id string) *ID {
-	return &ID{URI: IRI(fmt.Sprint("urn:uuid:", uuid.New()))}
+	return &ID{URI: IRI(id)}
 }
 
 // Check checks the ID for incompatibilities with RFC4287. It returns an error.