feat: 0.0.1

internal/val/validator.go

@@ -0,0 +1,72 @@
+package val
+
+import (
+	"fmt"
+	"net/mail"
+	"regexp"
+)
+
+var (
+	isValidUsername = regexp.MustCompile(`^[a-zA-Z0-9_]+$`).MatchString
+	isValidFullName = regexp.MustCompile(`^[a-zA-Z\s]+$`).MatchString
+)
+
+func ValidateString(val string, minLength int, maxLength int) error {
+	n := len(val)
+	if n < minLength || n > maxLength {
+		return fmt.Errorf("string length must be between %d and %d characters", minLength, maxLength)
+	}
+	return nil
+}
+
+func ValidateUsername(val string) error {
+	err := ValidateString(val, 3, 100)
+	if err != nil {
+		return fmt.Errorf("invalid username: %v", err)
+	}
+
+	if !isValidUsername(val) {
+		return fmt.Errorf("username can only contain lowercase alphanumeric characters and underscores")
+	}
+	return nil
+}
+
+func ValidateFullName(val string) error {
+	err := ValidateString(val, 3, 100)
+	if err != nil {
+		return fmt.Errorf("invalid full name: %v", err)
+	}
+
+	if !isValidFullName(val) {
+		return fmt.Errorf("full name can only contain alphabetic characters and spaces")
+	}
+	return nil
+}
+
+func ValidatePassword(val string) error {
+	return ValidateString(val, 6, 100)
+}
+
+func ValidateEmail(val string) error {
+	err := ValidateString(val, 3, 200)
+	if err != nil {
+		return fmt.Errorf("invalid username: %v", err)
+	}
+
+	if _, err := mail.ParseAddress(val); err != nil {
+		return fmt.Errorf("is not a valid email address")
+	}
+
+	return nil
+}
+
+func ValidateEmailID(val int64) error {
+	if val <= 0 {
+		return fmt.Errorf("email ID must be a positive integer")
+	}
+	return nil
+}
+
+func ValidateVerificationCode(val string) error {
+	return ValidateString(val, 32, 128)
+}