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Garry Tan
5ca8ec799e
Extends validateNavigationUrl to accept file:// URLs scoped to safe dirs
(cwd + TEMP_DIR) via the existing validateReadPath policy. The workhorse is a
new normalizeFileUrl() helper that handles non-standard relative forms BEFORE
the WHATWG URL parser sees them:
file:///abs/path.html → unchanged
file://./docs/page.html → file://<cwd>/docs/page.html
file://~/Documents/page.html → file://<HOME>/Documents/page.html
file://docs/page.html → file://<cwd>/docs/page.html
file://localhost/abs/path → unchanged
file://host.example.com/... → rejected (UNC/network)
file:// and file:/// → rejected (would list a directory)
Host heuristic rejects segments with '.', ':', '\\', '%', IPv6 brackets, or
Windows drive-letter patterns — so file://docs.v1/page.html, file://127.0.0.1/x,
file://[::1]/x, and file://C:/Users/x are explicit errors.
Uses fileURLToPath() + pathToFileURL() from node:url (never string-concat) so
URL escapes like %20 decode correctly and Node rejects encoded-slash traversal
(%2F..%2F) outright.
Signature change: validateNavigationUrl now returns Promise<string> (the
normalized URL) instead of Promise<void>. Existing callers that ignore the
return value still compile — they just don't benefit from smart-parsing until
updated in follow-up commits. Callers will be migrated in the next few commits
(goto, diff, newTab, restoreState).
Rewrites the url-validation test file: updates existing tests for the new
return type, adds 20+ new tests covering every normalizeFileUrl shape variant,
URL-encoding edge cases, and path-traversal rejection.
References: codex consult v3 P1 findings on URL parser semantics and fileURLToPath.