add chat file download

src/Infrastructure/BotSharp.Abstraction/Files/Models/FileInformation.cs

@@ -3,7 +3,7 @@ namespace BotSharp.Abstraction.Files.Models;
 public class FileInformation
 {
     /// <summary>
-    /// External file url
+    /// External file url for display
     /// </summary>
     [JsonPropertyName("file_url")]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
@@ -35,4 +35,11 @@ public class FileInformation
     [JsonPropertyName("file_extension")]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public string? FileExtension { get; set; } = string.Empty;
+
+    /// <summary>
+    /// External file url for download
+    /// </summary>
+    [JsonPropertyName("file_download_url")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? FileDownloadUrl { get; set; } = string.Empty;
 }

src/Infrastructure/BotSharp.Core/Agents/Services/AgentService.CreateAgent.cs

@@ -34,7 +34,7 @@ public partial class AgentService
                 {
                     UserId = user.Id,
                     AgentId = agentRecord.Id,
-                    Actions = new List<string> { UserAction.Edit },
+                    Actions = new List<string> { UserAction.Edit, UserAction.Chat },
                     CreatedTime = DateTime.UtcNow,
                     UpdatedTime = DateTime.UtcNow
                 }

src/Infrastructure/BotSharp.Core/Files/Services/Storage/LocalFileStorageService.Conversation.cs

@@ -69,6 +69,7 @@ public partial class LocalFileStorageService
                     {
                         MessageId = messageId,
                         FileUrl = $"/conversation/{conversationId}/message/{messageId}/{source}/file/{index}/{fileName}",
+                        FileDownloadUrl = $"/conversation/{conversationId}/message/{messageId}/{source}/file/{index}/{fileName}/download",
                         FileStorageUrl = file,
                         FileName = fileName,
                         FileExtension = fileExtension,

src/Infrastructure/BotSharp.OpenAPI/Controllers/ConversationController.cs

@@ -1,6 +1,7 @@
 using Azure;
 using BotSharp.Abstraction.Files.Constants;
 using BotSharp.Abstraction.Files.Enums;
+using BotSharp.Abstraction.Files.Utilities;
 using BotSharp.Abstraction.Options;
 using BotSharp.Abstraction.Routing;
 using BotSharp.Abstraction.Users.Enums;
@@ -488,6 +489,26 @@ public class ConversationController : ControllerBase
         }
         return BuildFileResult(file);
     }
+
+    [HttpGet("/conversation/{conversationId}/message/{messageId}/{source}/file/{index}/{fileName}/download")]
+    public IActionResult DownloadMessageFile([FromRoute] string conversationId, [FromRoute] string messageId, [FromRoute] string source, [FromRoute] string index, [FromRoute] string fileName)
+    {
+        var fileStorage = _services.GetRequiredService<IFileStorageService>();
+        var file = fileStorage.GetMessageFile(conversationId, messageId, source, index, fileName);
+        if (string.IsNullOrEmpty(file))
+        {
+            return NotFound();
+        }
+
+        var fName = file.Split(Path.DirectorySeparatorChar).Last();
+        var contentType = FileUtility.GetFileContentType(fName);
+        var stream = System.IO.File.Open(file, FileMode.Open, FileAccess.Read, FileShare.Read);
+        var bytes = new byte[stream.Length];
+        stream.Read(bytes, 0, (int)stream.Length);
+        stream.Position = 0;
+
+        return new FileStreamResult(stream, contentType) { FileDownloadName = fName };
+    }
     #endregion
 
     #region Private methods

src/Infrastructure/BotSharp.OpenAPI/ViewModels/Files/MessageFileViewModel.cs

@@ -19,6 +19,10 @@ public class MessageFileViewModel
     [JsonPropertyName("file_source")]
     public string FileSource { get; set; }
 
+    [JsonPropertyName("file_download_url")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? FileDownloadUrl { get; set; }
+
     public MessageFileViewModel()
     {
         
@@ -32,7 +36,8 @@ public class MessageFileViewModel
             FileName = model.FileName,
             FileExtension = model.FileExtension,
             ContentType = model.ContentType,
-            FileSource = model.FileSource
+            FileSource = model.FileSource,
+            FileDownloadUrl = model.FileDownloadUrl
         };
     }
 }

src/Plugins/BotSharp.Plugin.ChatHub/WebSocketsMiddleware.cs

@@ -37,6 +37,7 @@ public class WebSocketsMiddleware
         var regexes = new List<Regex>
         {
             new Regex(@"/conversation/(.*?)/message/(.*?)/(.*?)/file/(.*?)/(.*?)", RegexOptions.IgnoreCase),
+            new Regex(@"/conversation/(.*?)/message/(.*?)/(.*?)/file/(.*?)/(.*?)/download", RegexOptions.IgnoreCase),
             new Regex(@"/user/avatar", RegexOptions.IgnoreCase),
             new Regex(@"/knowledge/document/(.*?)/file/(.*?)", RegexOptions.IgnoreCase)
         };

src/Plugins/BotSharp.Plugin.TencentCos/Services/TencentCosService.Conversation.cs

@@ -66,6 +66,7 @@ public partial class TencentCosService
                     {
                         MessageId = messageId,
                         FileUrl = BuilFileUrl(file),
+                        FileDownloadUrl = BuilFileUrl(file),
                         FileStorageUrl = file,
                         FileName = fileName,
                         FileExtension = fileExtension,