Ben Barclay
56916841b5
refactor(dashboard-auth): replace PKCE cookie payload with base64url(JSON) codec ( #99210 )
...
The PKCE cookie's payload has now needed three serialization fixes at
the same spot: the original flat 'k=v;k=v' string tripped http.cookies'
\073 quoted form (dropped whole by strict cookie parsers like Go's
net/http — #83832 field case), and #99176 URL-encoded the whole flat
payload to stay inside the RFC 6265 cookie-octet set. The stacked
layers (single-encoded next=, ';' joins, whole-payload encoding, legacy
discriminator) were the recurring defect source.
Kill the bug class instead of patching it again: the payload is a dict
end-to-end and goes on the wire as base64url(JSON) — the urlsafe
alphabet is a strict subset of cookie-octets, and JSON framing means no
segment value can ever collide with a delimiter. parse_pkce_payload
keeps a three-rung compatibility ladder (base64url(JSON) -> oldest flat
form split-as-is -> #99176 unquote-then-split) for in-flight cookies
during a rolling upgrade (10-minute TTL); a new cookie hitting an old
server fails the OAuth state check and the user just retries.
The 'next' segment is stored as its plain validated path — no extra
encoding layer, so the post-login redirect Location is byte-for-byte
the original target.
Refs #99176 , #84065 .
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