Eva Sarafianou
904ee27f26
active-redirects.json entries whose `from` lives outside the docs CloudFront function's frozen legacy-Sphinx prefix set currently 404 in production. The stub file exists in S3 at <from>/index.html but the CFF (mattermost-iac-docs-prod -> 05-cdn -> clean-url-rewrite.js) only serves that key for the frozen legacy prefixes; for any other first path segment it falls back to <from>.html, which doesn't exist for plugin-client-redirects stubs. Add a postbuild step that duplicates every stub at the sibling flat key. The legacy branch keeps hitting <from>/index.html unchanged; the fallback branch now finds <from>.html. Real content pages are never overwritten (the script skips any path where <from>.html already exists), .html-suffixed from-values are skipped (CFF Phase A canonicalizes them before Phase B routes them), and .. traversal in a malformed from is rejected before any filesystem call. Smoke-tested against a local build: 741 stubs duplicated, 0 real content pages touched, byte-identical meta-refresh content.
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