feat: implement mail service client for email generation, mailbox creation, and verification code retrieval.

backend/internal/mail/service.go

@@ -355,30 +355,61 @@ func (m *Client) GetEmails(email string, size int) ([]EmailItem, error) {
 // WaitForCode 等待验证码邮件
 func (m *Client) WaitForCode(email string, timeout time.Duration) (string, error) {
 	start := time.Now()
+	// 匹配6位数字验证码
 	codeRegex := regexp.MustCompile(`\b(\d{6})\b`)
+	// 专门匹配 OpenAI 验证码邮件标题格式: "Your ChatGPT code is 016547" 或 "OpenAI - Verify your email"
+	titleCodeRegex := regexp.MustCompile(`(?i)(?:code\s+is\s+|code:\s*|验证码[：:]\s*)(\d{6})`)
+
+	// 记录已经看到的验证码，避免重复返回旧验证码
+	seenCodes := make(map[string]bool)
+
+	// 第一次获取邮件，记录已有的验证码（这些是旧的）
+	initialEmails, _ := m.GetEmails(email, 10)
+	for _, mail := range initialEmails {
+		// 从标题提取
+		if matches := codeRegex.FindStringSubmatch(mail.Subject); len(matches) >= 2 {
+			seenCodes[matches[1]] = true
+		}
+		// 从内容提取
+		content := mail.Content
+		if content == "" {
+			content = mail.Text
+		}
+		if matches := codeRegex.FindStringSubmatch(content); len(matches) >= 2 {
+			seenCodes[matches[1]] = true
+		}
+	}
 
 	for time.Since(start) < timeout {
 		emails, err := m.GetEmails(email, 10)
 		if err == nil {
 			for _, mail := range emails {
 				subject := strings.ToLower(mail.Subject)
-				// 匹配多种可能的验证码邮件主题
-				// 包括 "Your ChatGPT code is 016547" 格式
-				isCodeEmail := strings.Contains(subject, "code") ||
-					strings.Contains(subject, "verify") ||
-					strings.Contains(subject, "verification") ||
+				// 匹配 OpenAI/ChatGPT 验证码邮件
+				// 标题格式: "Your ChatGPT code is 016547" 或包含 "verify", "code" 等
+				isCodeEmail := strings.Contains(subject, "chatgpt code") ||
 					strings.Contains(subject, "openai") ||
-					strings.Contains(subject, "confirm") ||
-					strings.Contains(subject, "chatgpt")
+					strings.Contains(subject, "verify your email") ||
+					(strings.Contains(subject, "code") && strings.Contains(subject, "is"))
 
 				if !isCodeEmail {
 					continue
 				}
 
-				// 优先从标题中提取验证码 (如 "Your ChatGPT code is 016547")
-				matches := codeRegex.FindStringSubmatch(mail.Subject)
-				if len(matches) >= 2 {
-					return matches[1], nil
+				// 优先使用专门的标题正则匹配 (如 "Your ChatGPT code is 016547")
+				if matches := titleCodeRegex.FindStringSubmatch(mail.Subject); len(matches) >= 2 {
+					code := matches[1]
+					if !seenCodes[code] {
+						return code, nil
+					}
+				}
+
+				// 从标题中提取6位数字
+				if matches := codeRegex.FindStringSubmatch(mail.Subject); len(matches) >= 2 {
+					code := matches[1]
+					if !seenCodes[code] {
+						return code, nil
+					}
 				}
 
 				// 如果标题中没有，从内容中提取
@@ -386,9 +417,20 @@ func (m *Client) WaitForCode(email string, timeout time.Duration) (string, error
 				if content == "" {
 					content = mail.Text
 				}
-				matches = codeRegex.FindStringSubmatch(content)
-				if len(matches) >= 2 {
-					return matches[1], nil
+				// 在内容中查找验证码，优先匹配 "enter this code:" 后面的数字
+				contentCodeRegex := regexp.MustCompile(`(?i)(?:enter\s+this\s+code[：:]\s*|code[：:]\s*)(\d{6})`)
+				if matches := contentCodeRegex.FindStringSubmatch(content); len(matches) >= 2 {
+					code := matches[1]
+					if !seenCodes[code] {
+						return code, nil
+					}
+				}
+				// 最后尝试普通6位数字匹配
+				if matches := codeRegex.FindStringSubmatch(content); len(matches) >= 2 {
+					code := matches[1]
+					if !seenCodes[code] {
+						return code, nil
+					}
 				}
 			}
 		}