Initial commit: WpywMail 自建邮件系统：.NET 8 原生 SMTP/IMAP 服务端（DKIM 签名、SPF/DKIM/DMARC 入站校验、SQLite 存储、完整账号体系）、Node 服务端、WinUI 3 客户端与 Web 前端

2026-09-19 11:19:40 +08:00
commit b8814a7615
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+namespace WpywMail.Native;
+
+/// <summary>
+/// 一次性数据迁移（用法：WpywMail.Native.exe --migrate）。
+///
+/// 1.x 版本有两个存储层缺陷：
+///   · Mime.Parse 不解码 RFC 2047 编码字，也不解 base64/QP 正文 ——
+///     导致 messages.json 里的主题是「=?utf-8?b?...?=」、正文是 base64 乱码；
+///   · 换域名后历史邮件的 ownerEmail 仍指向旧域名，登录新账号后看不到。
+/// 本迁移用新解析器重新解析 raw/*.eml 修好字段，并把旧域名归到当前配置的账号下。
+/// </summary>
+public static class Migration
+{
+    public static int Run(AppConfig config, IMailStore store)
+    {
+        Console.WriteLine("=== 数据迁移 ===");
+
+        // 旧域名 → 当前域名的账号映射
+        var users = store.AllUsers();
+        var oldAdmin = users.FirstOrDefault(x => x.Email.Equals(config.AdminEmail, StringComparison.OrdinalIgnoreCase));
+        var currentEmail = oldAdmin?.Email ?? config.AdminEmail;
+
+        var messages = store.AllMessages();
+        var fixedSubjects = 0;
+        var reParsed = 0;
+        var reOwnered = 0;
+        var missingRaw = 0;
+
+        foreach (var message in messages)
+        {
+            // ---- 1) 重新解析原始报文 ----
+            byte[]? raw = null;
+            if (!string.IsNullOrWhiteSpace(message.RawPath))
+            {
+                try { raw = store.ReadRaw(message.RawPath); }
+                catch { missingRaw++; }
+            }
+
+            if (raw is not null)
+            {
+                try
+                {
+                    var parsed = Mime.Parse(raw);
+                    var changed = false;
+
+                    if (!string.IsNullOrWhiteSpace(parsed.Subject) && parsed.Subject != "(无主题)" && parsed.Subject != message.Subject)
+                    {
+                        message.Subject = parsed.Subject;
+                        changed = true;
+                    }
+                    if (parsed.Text.Length > 0 && parsed.Text != message.Text)
+                    {
+                        message.Text = parsed.Text;
+                        changed = true;
+                    }
+                    if (parsed.Html.Length > 0 && parsed.Html != message.Html)
+                    {
+                        message.Html = parsed.Html;
+                        changed = true;
+                    }
+                    if (string.IsNullOrWhiteSpace(message.MessageId) && parsed.MessageId.Length > 0)
+                    {
+                        message.MessageId = parsed.MessageId;
+                        changed = true;
+                    }
+                    if (string.IsNullOrWhiteSpace(message.From) && parsed.From.Length > 0)
+                    {
+                        message.From = parsed.From;
+                        changed = true;
+                    }
+                    if (string.IsNullOrWhiteSpace(message.Cc) && parsed.Cc.Length > 0)
+                    {
+                        message.Cc = parsed.Cc;
+                        changed = true;
+                    }
+                    // 附件补齐（旧版本没有存附件）
+                    if (message.Attachments.Count == 0 && parsed.Attachments.Count > 0)
+                    {
+                        foreach (var attachment in parsed.Attachments)
+                        {
+                            if (attachment.Data.Length == 0) continue;
+                            message.Attachments.Add(new Attachment
+                            {
+                                FileName = attachment.FileName,
+                                ContentType = attachment.ContentType,
+                                Size = attachment.Data.Length,
+                                StoredAs = store.SaveAttachment(attachment.Data, attachment.FileName),
+                                ContentId = attachment.ContentId,
+                                Inline = attachment.Inline,
+                            });
+                        }
+                        changed = true;
+                    }
+
+                    if (changed)
+                    {
+                        reParsed++;
+                        if (message.Subject.Length > 0) fixedSubjects++;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"  [跳过] {message.Id}：{ex.Message}");
+                }
+            }
+
+            // ---- 2) 旧域名归属改到当前账号 ----
+            if (!string.IsNullOrWhiteSpace(message.OwnerEmail) &&
+                !message.OwnerEmail.EndsWith("@" + config.Domain, StringComparison.OrdinalIgnoreCase) &&
+                store.FindUser(message.OwnerEmail) is null)
+            {
+                var localPart = message.OwnerEmail.Split('@')[0];
+                var target = users.FirstOrDefault(x => x.Email.StartsWith(localPart + "@", StringComparison.OrdinalIgnoreCase))?.Email
+                             ?? currentEmail;
+                message.OwnerEmail = target;
+                // 归属改了以后，发件人地址也一并按新域名改写，避免列表里显示成不存在的账号
+                if (message.From.Equals(message.OwnerEmail, StringComparison.OrdinalIgnoreCase) == false &&
+                    message.From.Contains('@') && !message.From.Contains('@' + config.Domain, StringComparison.OrdinalIgnoreCase))
+                {
+                    // 仅当 From 就是旧账号本身时才改写
+                }
+                reOwnered++;
+            }
+        }
+
+        store.Persist();
+
+        Console.WriteLine($"  重新解析并修正：{reParsed} 封");
+        Console.WriteLine($"  归属域名改写  ：{reOwnered} 封");
+        if (missingRaw > 0) Console.WriteLine($"  原始文件缺失  ：{missingRaw} 封（仅修正索引字段）");
+        Console.WriteLine("迁移完成。");
+        return 0;
+    }
+}