feat(attachments): 补充附件管理接口

review_agent/file_summary/views.py

@@ -1,4 +1,6 @@
 from django.contrib.auth.decorators import login_required
+from django.db.models import Count, Q
+import json
 import logging
 from pathlib import Path
 
@@ -8,6 +10,7 @@ from django.views.decorators.http import require_http_methods
 from review_agent.models import Conversation, ExportedSummaryFile, FileAttachment, Message
 from review_agent.models import FileSummaryBatch, WorkflowEvent
 from .events import serialize_event
+from .paths import resolve_storage_path
 
 from .storage import save_uploaded_attachment, serialize_attachment
 
@@ -68,7 +71,7 @@ def attachments(request, conversation_id: int):
     return JsonResponse({"attachments": [serialize_attachment(item) for item in queryset]})
 
 
-@require_http_methods(["DELETE"])
+@require_http_methods(["DELETE", "PATCH"])
 @login_required
 def attachment_detail(request, conversation_id: int, attachment_id: int):
     conversation = _conversation_for_user(request.user, conversation_id)
@@ -80,6 +83,32 @@ def attachment_detail(request, conversation_id: int, attachment_id: int):
     if not attachment:
         raise Http404("附件不存在。")
 
+    if request.method == "PATCH":
+        try:
+            payload = json.loads(request.body.decode("utf-8") or "{}")
+        except json.JSONDecodeError:
+            return JsonResponse({"error": "JSON 格式错误。"}, status=400)
+
+        update_fields = []
+        original_name = (payload.get("original_name") or "").strip()
+        if original_name:
+            attachment.original_name = Path(original_name).name
+            update_fields.append("original_name")
+        if "is_active" in payload:
+            attachment.is_active = bool(payload["is_active"])
+            update_fields.append("is_active")
+        if update_fields:
+            attachment.save(update_fields=update_fields)
+        logger.info(
+            "Attachment updated",
+            extra={
+                "conversation_id": conversation.pk,
+                "attachment_id": attachment.pk,
+                "update_fields": update_fields,
+            },
+        )
+        return JsonResponse({"ok": True, "attachment": serialize_attachment(attachment)})
+
     attachment.upload_status = FileAttachment.UploadStatus.DELETED
     attachment.is_active = False
     attachment.save(update_fields=["upload_status", "is_active"])
@@ -90,6 +119,65 @@ def attachment_detail(request, conversation_id: int, attachment_id: int):
     return JsonResponse({"ok": True, "attachment": serialize_attachment(attachment)})
 
 
+@require_http_methods(["GET"])
+@login_required
+def conversation_list(request):
+    conversations = (
+        Conversation.objects.filter(user=request.user)
+        .annotate(
+            attachment_count=Count(
+                "file_attachments",
+                filter=~Q(file_attachments__upload_status=FileAttachment.UploadStatus.DELETED),
+            )
+        )
+        .order_by("-updated_at", "-id")
+    )
+    return JsonResponse(
+        {
+            "conversations": [
+                {
+                    "id": conversation.pk,
+                    "title": conversation.title or "新对话",
+                    "updated_at": conversation.updated_at.isoformat(),
+                    "attachment_count": conversation.attachment_count,
+                }
+                for conversation in conversations
+            ]
+        }
+    )
+
+
+@require_http_methods(["GET"])
+@login_required
+def attachment_download(request, conversation_id: int, attachment_id: int):
+    conversation = _conversation_for_user(request.user, conversation_id)
+    attachment = FileAttachment.objects.filter(
+        pk=attachment_id,
+        conversation=conversation,
+        user=request.user,
+    ).exclude(upload_status=FileAttachment.UploadStatus.DELETED).first()
+    if not attachment:
+        raise Http404("附件不存在。")
+
+    path = resolve_storage_path(attachment.storage_path)
+    if not path.exists():
+        logger.warning(
+            "Attachment download missing file",
+            extra={"attachment_id": attachment.pk, "storage_path": attachment.storage_path},
+        )
+        return JsonResponse({"error": "文件不存在。"}, status=404)
+    logger.info(
+        "Attachment download started",
+        extra={"conversation_id": conversation.pk, "attachment_id": attachment.pk},
+    )
+    return FileResponse(
+        path.open("rb"),
+        as_attachment=True,
+        filename=attachment.original_name,
+        content_type=attachment.content_type or "application/octet-stream",
+    )
+
+
 def _serialize_message(message: Message) -> dict[str, object]:
     return {
         "id": message.pk,