ZrAdminNetCore/ZR.Common/MailHelper.cs

using Infrastructure;
using Infrastructure.Model;
using MailKit.Net.Smtp;
using MimeKit;
using MimeKit.Text;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace ZR.Common
{
    public class MailHelper
    {
        /// <summary>
        /// 发送人邮箱
        /// </summary>
        public string FromEmail { get; set; } = "";
        private readonly MailOptions mailOptions = new();

        public MailHelper()
        {
            AppSettings.Bind("MailOptions", mailOptions);
            FromEmail = mailOptions.FromEmail;
        }
        public MailHelper(MailOptions _mailOptions)
        {
            this.mailOptions = _mailOptions;
            FromEmail = _mailOptions.FromEmail;
        }
        /// <summary>
        /// 发送一个
        /// </summary>
        /// <param name="toAddress"></param>
        /// <param name="subject"></param>
        /// <param name="text"></param>
        /// <param name="path"></param>
        public string SendMail(string toAddress, string subject, string text, string path = "", string html = "")
        {
            IEnumerable<MailboxAddress> mailboxes = new List<MailboxAddress>() {
                new MailboxAddress(toAddress, toAddress)
            };

            return SendMail(mailboxes, subject, text, path, html);
        }

        /// <summary>
        /// 发送多个邮箱
        /// </summary>
        /// <param name="toAddress"></param>
        /// <param name="subject"></param>
        /// <param name="text"></param>
        /// <param name="path"></param>
        public string SendMail(string[] toAddress, string subject, string text, string path = "", string html = "")
        {
            IList<MailboxAddress> mailboxes = new List<MailboxAddress>() { };
            foreach (var item in toAddress)
            {
                mailboxes.Add(new MailboxAddress(item, item));
            }

            return SendMail(mailboxes, subject, text, path, html);
        }

        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="toAddress"></param>
        /// <param name="subject">主题</param>
        /// <param name="text"></param>
        /// <param name="path">附件url地址</param>
        /// <param name="html">网页HTML内容</param>
        private string SendMail(IEnumerable<MailboxAddress> toAddress, string subject, string text, string path = "", string html = "")
        {
            MimeMessage message = new MimeMessage();
            //发件人
            message.From.Add(new MailboxAddress(mailOptions.FromName, mailOptions.FromEmail));
            //收件人
            message.To.AddRange(toAddress);
            message.Subject = subject;
            message.Date = DateTime.Now;

            //创建附件Multipart
            Multipart multipart = new Multipart("mixed");
            var alternative = new MultipartAlternative();
            //html内容
            if (!string.IsNullOrEmpty(html))
            {
                var Html = new TextPart(TextFormat.Html)
                {
                    Text = html
                };
                alternative.Add(Html);
            }
            //文本内容
            //if (!string.IsNullOrEmpty(text))
            //{
            var plain = new TextPart(TextFormat.Plain)
            {
                Text = text + "\r\n\n\n" + mailOptions.Signature
            };
            alternative.Add(plain);
            //}

            //附件
            if (!string.IsNullOrEmpty(path))
            {
                string[] files = path.Split(",");
                foreach (var file in files)
                {
                    MimePart attachment = new()
                    {
                        Content = new MimeContent(File.OpenRead(file), ContentEncoding.Default),
                        //读取文件，只能用绝对路径
                        ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                        ContentTransferEncoding = ContentEncoding.Base64,
                        //文件名字
                        FileName = Path.GetFileName(path)
                    };
                    alternative.Add(attachment);
                }
            }
            multipart.Add(alternative);
            //赋值邮件内容
            message.Body = multipart;

            //开始发送
            using var client = new SmtpClient();
            client.ServerCertificateValidationCallback = (s, c, h, e) => true;
            //client.CheckCertificateRevocation = false;
            client.Connect(mailOptions.Smtp, mailOptions.Port, mailOptions.UseSsl);

            //登录，发送
            //特别说明，对于服务器端的中文相应，Exception中有编码问题，显示乱码了
            client.Authenticate(System.Text.Encoding.UTF8, mailOptions.FromEmail, mailOptions.Password);

            try
            {
                var result = client.Send(message);
                //断开
                client.Disconnect(true);
                Console.WriteLine($"【{DateTime.Now}】发送邮件结果{result}");
                return result;
            }
            catch (Exception ex)
            {
                client.Disconnect(true);
                Log.WriteLine(ConsoleColor.Red, "发送邮件失败" + ex.Message);
                return "fail";
            }
        }
        
        public string VerifyCode(int n)
        {
            var strB = new StringBuilder();
            var rand = new Random();
            for (var i = 0; i < n; i++)
            {
                var r1 = rand.Next(3);
                var r2 = 0;
                // r2为ASCII码值
                switch (r1)
                {
                    case 0: // 数字: 48-57的随机数
                        r2 = rand.Next(48, 58);
                        break;
                    case 1:
                        r2 = rand.Next(65, 91); // 大写字母: 65-90的随机数
                        break;
                    case 2:
                        r2 = rand.Next(97, 123); // 小写字母: 97-122的随机数
                        break;
                }

                strB.Append((char)r2);
            }
            return strB.ToString();
        }
    }
}