Centralize output schema and module key validation catalogs

internal/core/modulecatalog/catalog.go

@@ -0,0 +1,35 @@
+package modulecatalog
+
+import "strings"
+
+const (
+	KeyGlossary   = "glossary"
+	KeyHomophones = "homophones"
+	KeySpokenWord = "spoken_word"
+	KeyGrammar    = "grammar"
+)
+
+var supportedKeys = []string{
+	KeyGlossary,
+	KeyHomophones,
+	KeySpokenWord,
+	KeyGrammar,
+}
+
+var supportedKeySet = map[string]struct{}{
+	KeyGlossary:   {},
+	KeyHomophones: {},
+	KeySpokenWord: {},
+	KeyGrammar:    {},
+}
+
+func SupportedKeys() []string {
+	out := make([]string, len(supportedKeys))
+	copy(out, supportedKeys)
+	return out
+}
+
+func IsSupported(key string) bool {
+	_, ok := supportedKeySet[strings.TrimSpace(key)]
+	return ok
+}

internal/core/modulecatalog/catalog_test.go

@@ -0,0 +1,24 @@
+package modulecatalog
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestSupportedKeys(t *testing.T) {
+	want := []string{KeyGlossary, KeyHomophones, KeySpokenWord, KeyGrammar}
+	if got := SupportedKeys(); !reflect.DeepEqual(got, want) {
+		t.Fatalf("unexpected supported keys: got=%v want=%v", got, want)
+	}
+}
+
+func TestIsSupported(t *testing.T) {
+	for _, key := range SupportedKeys() {
+		if !IsSupported(key) {
+			t.Fatalf("expected key %q to be supported", key)
+		}
+	}
+	if IsSupported("made_up") {
+		t.Fatalf("did not expect made_up to be supported")
+	}
+}