Add filename to Content-Disposition header for DAM downloads

.changeset/dam-download-content-disposition-filename.md

@@ -0,0 +1,7 @@
+---
+"@dextinity/cms-api": patch
+---
+
+Add the file name to the `Content-Disposition` header of DAM file downloads
+
+The header was previously set to `attachment` without a file name, so browsers derived the name of the downloaded file from the URL, which contains the file name without its extension.

packages/api/cms-api/src/dam/files/files.controller.ts

@@ -239,7 +239,7 @@ export function createFilesController({ Scope: PassedScope, damBasePath }: { Sco
                 throw new ForbiddenException();
             }
 
-            res.setHeader("Content-Disposition", "attachment");
+            res.attachment(file.name);
             return this.streamFile(file, res, { range, overrideHeaders: { "cache-control": "max-age=31536000, private" } }); // Local caches only (1 year)
         }
 
@@ -264,7 +264,7 @@ export function createFilesController({ Scope: PassedScope, damBasePath }: { Sco
                 throw new BadRequestException("Content Hash mismatch!");
             }
 
-            res.setHeader("Content-Disposition", "attachment");
+            res.attachment(file.name);
             return this.streamFile(file, res, { range, overrideHeaders: { "cache-control": "max-age=31536000, s-maxage=86400, public" } }); // Public cache, 1 year for browsers, 1 day for proxies/cdn's
         }