feat: support long text and safe attachment batches

2026-09-30 09:16:36 +08:00
parent a977902b25
commit edba7d0d38
26 changed files with 720 additions and 82 deletions
@@ -0,0 +1,37 @@
+namespace WxAgent.Core;
+
+public static class WechatAttachmentInput
+{
+    public const int MaxBatchSize = 10;
+    private static readonly HashSet<string> ImageExtensions = new([".png", ".jpg", ".jpeg", ".gif", ".bmp", ".webp"], StringComparer.OrdinalIgnoreCase);
+
+    public static bool IsImagePath(string? path) =>
+        !string.IsNullOrWhiteSpace(path) && ImageExtensions.Contains(Path.GetExtension(path));
+
+    public static IReadOnlyList<string> PrepareFilePaths(IReadOnlyList<string>? paths)
+    {
+        if (paths is null || paths.Count is < 2 or > MaxBatchSize)
+            throw new WxAgentException(WxAgentErrorCode.InvalidArgument, $"File batches must contain 2-{MaxBatchSize} attachments.");
+
+        var normalized = new string[paths.Count];
+        for (var index = 0; index < paths.Count; index++)
+        {
+            var path = paths[index];
+            if (string.IsNullOrWhiteSpace(path))
+                throw new WxAgentException(WxAgentErrorCode.InvalidArgument, "Attachment paths must not be empty.");
+
+            string fullPath;
+            try { fullPath = Path.GetFullPath(path); }
+            catch (Exception exception) when (exception is ArgumentException or NotSupportedException or PathTooLongException)
+            {
+                throw new WxAgentException(WxAgentErrorCode.InvalidArgument, "An attachment path is invalid.");
+            }
+
+            if (!File.Exists(fullPath))
+                throw new WxAgentException(WxAgentErrorCode.InvalidArgument, "An attachment file does not exist.");
+            normalized[index] = fullPath;
+        }
+
+        return normalized;
+    }
+}