Profanity update

Mii names now get normalised, and the bad word list's cache gets cleared if the profanity.txt file has been updated.

nas/profanity.go

@@ -5,18 +5,42 @@ import (
 	"errors"
 	"os"
 	"strings"
+	"time"
 )
 
 var profanityFilePath = "./profanity.txt"
 var profanityFileLines []string = nil
+var lastModTime time.Time
+
+var symbolEquivalences = map[rune]rune{
+    '1': 'i',
+    '0': 'o',
+    '5': 's',
+    '4': 'a',
+    '3': 'e',
+    '7': 't',
+    '9': 'g',
+    '2': 'z',
+    '(': 'c',
+}
 
 func CacheProfanityFile() error {
+	fileInfo, err := os.Stat(profanityFilePath)
+	if err != nil {
+		return err
+	}
+
+	if !fileInfo.ModTime().After(lastModTime) && profanityFileLines != nil {
+		return nil
+	}
+
 	file, err := os.Open(profanityFilePath)
 	if err != nil {
 		return err
 	}
 	defer file.Close()
 
+	profanityFileLines = nil
 	scanner := bufio.NewScanner(file)
 	for scanner.Scan() {
 		line := scanner.Text()
@@ -32,16 +56,34 @@ func CacheProfanityFile() error {
 		return errors.New("the file '" + profanityFilePath + "' is empty")
 	}
 
+	lastModTime = fileInfo.ModTime()
 	return nil
 }
 
+func normalizeWord(word string) string {
+	var normalized strings.Builder
+	for _, char := range word {
+		if equivalent, exists := symbolEquivalences[char]; exists {
+			normalized.WriteRune(equivalent)
+		} else {
+			normalized.WriteRune(char)
+		}
+	}
+	return normalized.String()
+}
+
 func IsBadWord(word string) (bool, error) {
 	if !isProfanityFileCached() {
-		return false, errors.New("the file '" + profanityFilePath + "' has not been cached")
+		err := CacheProfanityFile()
+		if err != nil {
+			return false, errors.New("the file '" + profanityFilePath + "' has not been cached")
+		}
+
 	}
 
+	normalizedWord := normalizeWord(word)
 	for _, line := range profanityFileLines {
-		if strings.EqualFold(line, word) {
+		if strings.EqualFold(line, normalizedWord) {
 			return true, nil
 		}
 	}
@@ -50,5 +92,9 @@ func IsBadWord(word string) (bool, error) {
 }
 
 func isProfanityFileCached() bool {
-	return profanityFileLines != nil
+	fileInfo, err := os.Stat(profanityFilePath)
+	if err != nil {
+		return false
+	}
+	return profanityFileLines != nil && !fileInfo.ModTime().After(lastModTime)
 }