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2e969d6ed1
This follows up on Brian's work to transition not just to a new format
with an empty scope value, but instead to replace the existing format
entirely with a new one that:
1) includes a version number to support future format migrations
2) doesn't include a field for the scope at all, since scoping the
tokens adds no real security benefit and just makes verification
more difficult
3) replaces the raw SHA-256 hash with a SHA-256 HMAC instead, as a
best practice to avoid length-extension attacks [1], even though
in our particular case they would only be able to extend the
timestamp and would thus be relatively innocuous
The new format will be produced by calling generateToken(), and the
scope-accepting version is renamed to generateLegacyToken() in addition
to its existing deprecation, for maximum clarity.
I changed the validateToken() logic to stop accepting a scope entirely;
when validating a legacy-style token, we'll test it against the two
existing legacy scope values ("admin" and "console") and accept it if
it matches either one.
Note that this means the xsrfScope parameter in @Action is now wholly
obsolete; I'll remove it in a follow-up to avoid bringing extra files
into this CL.
After this CL hits production, the next one will replace all calls to
generateLegacyToken() with generateToken(). Once that CL is deployed,
the last step will be removing the legacy fallback in validateToken().
[1] See https://en.wikipedia.org/wiki/Length_extension_attack
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=148936805
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