修复邮箱地址格式校验

backend/utils/address/address.go

@@ -1,12 +1,30 @@
 package address
 
-import "strings"
+import (
+	"net/mail"
+	"strings"
+)
 
 // IsValidEmailAddress 检查是否是有效的邮箱地址
 func IsValidEmailAddress(str string) bool {
-	ars := strings.Split(str, "@")
-	if len(ars) != 2 {
+	parsed, err := mail.ParseAddress(str)
+	if err != nil || parsed.Address != str {
 		return false
 	}
-	return strings.Contains(ars[1], ".")
+
+	separator := strings.LastIndexByte(str, '@')
+	if separator <= 0 || separator == len(str)-1 {
+		return false
+	}
+
+	localPart := str[:separator]
+	domain := str[separator+1:]
+	if strings.Contains(localPart, "..") || strings.HasPrefix(localPart, ".") || strings.HasSuffix(localPart, ".") {
+		return false
+	}
+	if strings.Contains(domain, "..") || strings.HasPrefix(domain, ".") || strings.HasSuffix(domain, ".") {
+		return false
+	}
+
+	return strings.Contains(domain, ".")
 }

backend/utils/address/address_test.go

@@ -40,3 +40,24 @@ func TestIsValidEmailAddress(t *testing.T) {
 		})
 	}
 }
+
+func TestIsValidEmailAddressRejectsMalformedAddresses(t *testing.T) {
+	invalid := []string{
+		"@example.com",
+		"user@",
+		"user..name@example.com",
+		"user@example..com",
+		"user name@example.com",
+		"User <user@example.com>",
+		" user@example.com",
+		"user@example.com ",
+		".user@example.com",
+		"user.@example.com",
+		"user@example.com.",
+	}
+	for _, value := range invalid {
+		if IsValidEmailAddress(value) {
+			t.Errorf("IsValidEmailAddress(%q) = true, want false", value)
+		}
+	}
+}