⚡ implement email verification feature, add captcha validation middleware, and enhance user authentication flow

pkg/utils/strings.go

@@ -0,0 +1,27 @@
+package utils
+
+import "math/rand"
+
+type stringsUtils struct{}
+
+var Strings = stringsUtils{}
+
+func (s *stringsUtils) GenerateRandomString(length int) string {
+	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	result := make([]byte, length)
+	for i := range result {
+		result[i] = charset[rand.Intn(len(charset))]
+	}
+	return string(result)
+}
+
+func (s *stringsUtils) GenerateRandomStringWithCharset(length int, charset string) string {
+	if charset == "" {
+		charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	}
+	result := make([]byte, length)
+	for i := range result {
+		result[i] = charset[rand.Intn(len(charset))]
+	}
+	return string(result)
+}