add:

更新
2026-02-23 18:52:32 +08:00
parent d429560511
commit 123fa6a7aa
81 changed files with 5952 additions and 407 deletions
@@ -0,0 +1,51 @@
+namespace IM_API.Tools
+{
+    public static class ObjectNameGenerator
+    {
+        public static string Generate(ObjectNameContext ctx)
+        {
+            var ext = GetExtension(ctx.FileName, ctx.ContentType);
+            var shortId = Guid.NewGuid().ToString("N")[..12];
+
+            var parts = new List<string>
+        {
+            ctx.Biz,
+            ctx.Now.Year.ToString(),
+            ctx.Now.Month.ToString("D2")
+        };
+
+            if (ctx.UserId.HasValue)
+            {
+                parts.Add(ctx.UserId.Value.ToString());
+            }
+
+            parts.Add($"{shortId}{ext}");
+
+            return string.Join("/", parts);
+        }
+
+        private static string GetExtension(string fileName, string contentType)
+        {
+            var ext = Path.GetExtension(fileName);
+            if (!string.IsNullOrWhiteSpace(ext))
+                return ext.ToLowerInvariant();
+
+            return contentType switch
+            {
+                "image/jpeg" => ".jpg",
+                "image/png" => ".png",
+                "video/mp4" => ".mp4",
+                _ => ".bin"
+            };
+        }
+    }
+    public class ObjectNameContext
+    {
+        public string Biz { get; init; } = "IM";
+        public long? UserId { get; init; }
+        public string FileName { get; init; } = default!;
+        public string ContentType { get; init; } = default!;
+        public DateTimeOffset Now { get; init; } = DateTimeOffset.UtcNow;
+    }
+
+}