Create isValidMediaType and isValidLanguageTag

atom.go

@@ -4,6 +4,8 @@ import (
 	"mime"
 	"regexp"
 	"strings"
+
+	"golang.org/x/text/language"
 )
 
 type (
@@ -66,3 +68,13 @@ func isXMLMediaType(mediaType string) bool {
 
 	return strings.HasSuffix(mediaType, "/xml") || strings.HasSuffix(mediaType, "+xml")
 }
+
+func isValidMediaType(mediaType string) bool {
+	_, _, err := mime.ParseMediaType(mediaType)
+	return err == nil
+}
+
+func isValidLanguageTag(tag LanguageTag) bool {
+	_, err := language.Parse(string(tag))
+	return err == nil
+}

go.mod

@@ -2,4 +2,7 @@ module streifling.com/jason/atom-feed
 
 go 1.23.2
 
-require github.com/google/uuid v1.6.0
+require (
+	github.com/google/uuid v1.6.0
+	golang.org/x/text v0.19.0
+)

go.sum

@@ -1,2 +1,4 @@
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
+golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=