content disposition

backend/src/routes/documents.rs

@@ -1113,10 +1113,13 @@ pub async fn get_document_asset(
 
     let mut object_responses = Vec::with_capacity(objects.len());
     for object in objects {
+        let response_disposition = presign_disposition_for_asset(&asset, &object);
+
         let url = storage
             .presign_get_object(
                 &object.s3_key,
                 Duration::from_secs(PRESIGNED_URL_EXPIRY_SECONDS),
+                response_disposition.as_deref(),
             )
             .await
             .storage_context("failed to generate asset URL")?;
@@ -1135,6 +1138,14 @@ pub async fn get_document_asset(
     Ok(Json(to_asset_detail_response(asset, object_responses)))
 }
 
+fn presign_disposition_for_asset(
+    asset: &DocumentAsset,
+    object: &DocumentAssetObject,
+) -> Option<String> {
+    let filename = format!("{}-{}", asset.asset_type, object.ordinal);
+    inline_content_disposition(&filename)
+}
+
 #[utoipa::path(
     get,
     path = "/api/documents/{id}/versions",
@@ -1271,6 +1282,7 @@ pub async fn download_with_token(
         .presign_get_object(
             &version.s3_key,
             Duration::from_secs(PRESIGNED_URL_EXPIRY_SECONDS),
+            None,
         )
         .await
         .storage_context("failed to generate download URL")?;

backend/src/routes/webdav/mod.rs

@@ -320,6 +320,7 @@ async fn stream_document(
         .presign_get_object(
             &version.s3_key,
             Duration::from_secs(DOWNLOAD_URL_TTL_SECONDS),
+            None,
         )
         .await
         .storage_context("failed to presign document download")?;