fix: enforce mimeTypes restriction when useTempFiles is enabled#16255
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eddieran wants to merge 4 commits intopayloadcms:mainfrom
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fix: enforce mimeTypes restriction when useTempFiles is enabled#16255eddieran wants to merge 4 commits intopayloadcms:mainfrom
eddieran wants to merge 4 commits intopayloadcms:mainfrom
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When `useTempFiles` is true, `file.data` is an empty buffer so `fileTypeFromBuffer` returns undefined. The fallback extension-based validation was gated behind `!useTempFiles`, which meant it was skipped entirely — allowing any file type to bypass MIME restrictions. Remove the `!useTempFiles` condition so extension-based validation always runs when buffer detection fails, regardless of temp file mode. Fixes payloadcms#16233 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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This replaces #16236 which was auto-closed when the fork was deleted.
Overview
Fixes MIME type validation being skipped on upload collections when
upload.useTempFiles: trueis set globally.Key Changes
file.datais empty (as it is with temp files), read content fromfile.tempFilePathbefore running validation!useTempFilesgate that was causing the entire fallback validation block to be skippedDesign Decisions
The original code used the
useTempFilesconfig flag to decide whether to run fallback validation, but checkingtempFilePathdirectly is more accurate.Files uploaded via the local API always have
file.datapopulated even whenuseTempFilesis enabled.Simply removing the gate (as originally suggested) would've fixed the extension check but left
validateSvgbroken, since it would still run on an empty buffer and always return safe.Fixes #16233.