commit a87210a1926cf2c2c216d1121d2bba84e1e0840f
from: Oliver Lowe <o@olowe.co>
date: Thu Apr 14 01:09:14 2022 UTC

exclude known derogatory words from usernames

commit - 63d6f8291650351e5067cd50373f3f6d202b65df
commit + a87210a1926cf2c2c216d1121d2bba84e1e0840f
blob - 7a3c4393c7ed79653bd98da9527be675ab1e44d5
blob + 31ae18d54a51af4ab1cf4d13fad88ec1a394e0ab
--- random.go
+++ random.go
@@ -46,6 +46,18 @@ func randomLine(f *os.File) (string, error) {
 	return line, nil
 }
 
+// /usr/share/dict/words contains derogatory words
+// which we don't think should be used in public usernames.
+func derogatory(s string) bool {
+	if s == "bitch" {
+		return true
+	}
+	if strings.HasPrefix(s, "nigger") {
+		return true
+	}
+	return false
+}
+
 // RandomUsername generates a random username from the dictionary file at dictpath.
 // The dictionary file should be a newline delimited text file, one word per line.
 // On Unix systems, the file /usr/share/dic/words is a suitable file.
@@ -56,16 +68,26 @@ func RandomUsername(dictpath string) (string, error) {
 	}
 	defer f.Close()
 
-	first, err := randomLine(f)
-	if err != nil {
-		return "", fmt.Errorf("first random word: %w", err)
+	var first, second string
+	for {
+		first, err = randomLine(f)
+		if err != nil {
+			return "", fmt.Errorf("first random word: %w", err)
+		}
+		first = strings.ToLower(first)
+		if !derogatory(first) {
+			break
+		}
 	}
-	first = strings.ToLower(first)
-	second, err := randomLine(f)
-	if err != nil {
-		return "", fmt.Errorf("second random word: %w", err)
+	for {
+		second, err = randomLine(f)
+		if err != nil {
+			return "", fmt.Errorf("second random word: %w", err)
+		}
+		second = strings.ToLower(second)
+		if !derogatory(second) {
+			break
+		}
 	}
-	second = strings.ToLower(second)
-
 	return fmt.Sprintf("%s_%s%02d", first, second, rand.Intn(99)), nil
 }