Clients who need smaller files no longer make the photographer re-export. Two capabilities, both off by default.
STANDARD RESOLUTION — the size a gallery hands out for every ordinary download (single, selected, download-all). Global default in Settings, overridable per gallery with the NULL=inherit tri-state. The pre-built download-all zip is built AT the standard resolution, so changing it invalidates those archives, including a fan-out to inheriting galleries.
RESOLUTION PICKER — opt-in modal letting guests choose a different size. Custom archives are built as a DB-backed job the client polls, never cached. The picker never offers a size above the standard, and Original reappears only when the admin explicitly allows it.
Resize is fit:'inside' + withoutEnlargement — aspect preserved, never upscaled — applied before the watermark, since the mark is sized relative to its input.
Three rounds of external review hardened this: job archives are bound to the requester's visibility scope and re-validated at delivery, the streamed download-all path applies the cap, queue admission is bounded, and rejected resolutions no longer inflate download stats.
Closes#858.
Paul Nothaft
8e3573788b