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The callback is passed through the calls from the mojo interface to the file stream reader. Where it is used to gain a ScopedFileAccess token to read files. The callback is not yet created for the calls depending on the destination URL. That will happen with a CL for b/262203074. There are different cases for default behavior, where we do not need to query the daemon with a specific URL. Only files explicitly known/downloaded to the user can be protected. That excludes e.g. caches. The daemon would not deny those accesses, so we do not have to ask for permission. The other default are cases, where we want to allow access regardless of the rules. Here we have to query the daemon with a request for the system component (e.g. by the callback returned by ScopedFileAccessDelegate::GetCallbackForSystemIO). Design doc: go/access-to-dlp-restricted-files-upload BUG=b:262199707 Change-Id: Id71ac3463aae4c0d0b02bb3a264c2a8d05798f22 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4197601 Reviewed-by: Sergey Poromov <poromov@chromium.org> Reviewed-by: Austin Sullivan <asully@chromium.org> Commit-Queue: Daniel Brinkers <brinky@google.com> Reviewed-by: Marcello Salomao <msalomao@google.com> Reviewed-by: Marijn Kruisselbrink <mek@chromium.org> Cr-Commit-Position: refs/heads/main@{#1114995}
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