fix: retain cultivate feed media references

server/internal_cultivate.go

@@ -23,8 +23,9 @@ type cultivateRelationsRequest struct {
 }
 
 type cultivateFilesRequest struct {
-	UserID  int64    `json:"user_id"`
-	FileIDs []string `json:"file_ids"`
+	UserID      int64    `json:"user_id"`
+	ReferenceID int64    `json:"reference_id"`
+	FileIDs     []string `json:"file_ids"`
 }
 
 type cultivateReviewRequest struct {
@@ -162,6 +163,7 @@ func serveCultivateFiles(w http.ResponseWriter, r *http.Request, tenantID types.
 	}
 	uid := store.EncodeUid(body.UserID)
 	items := make([]map[string]any, 0, len(body.FileIDs))
+	fileIDs := make([]string, 0, len(body.FileIDs))
 	for _, supplied := range body.FileIDs {
 		fileID := normalizeIMUploadedFileID(supplied)
 		file, err := store.Files.Get(tenantID, fileID)
@@ -173,11 +175,24 @@ func serveCultivateFiles(w http.ResponseWriter, r *http.Request, tenantID types.
 			writeIMError(w, r, http.StatusUnprocessableEntity, 30000, imReasonMalformedRequest, "invalid file", map[string]any{"file_id": supplied})
 			return
 		}
+		fileIDs = append(fileIDs, fileID)
 		items = append(items, map[string]any{"file_id": fileID, "mime_type": file.MimeType, "size": file.Size, "review_status": cultivateFileReviewStatus(tenantID, fileID)})
 	}
+	if body.ReferenceID > 0 {
+		for index, fileID := range fileIDs {
+			if err := store.Files.LinkAttachments(tenantID, cultivateFileReferenceTopic(body.ReferenceID, index), types.ZeroUid, []string{fileID}); err != nil {
+				writeIMError(w, r, http.StatusInternalServerError, 90000, imReasonInternal, "failed to retain file", nil)
+				return
+			}
+		}
+	}
 	writeIMSuccess(w, r, map[string]any{"items": items})
 }
 
+func cultivateFileReferenceTopic(referenceID int64, index int) string {
+	return "cvp" + strconv.FormatInt(referenceID, 36) + "x" + strconv.FormatInt(int64(index), 36)
+}
+
 func fileOwner(file *types.FileDef) string {
 	if file == nil {
 		return ""