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Since judge_held moved to access::rules (1140), swarm::refusals uses
ReadDoc no more; clippy warned.
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The API checks the path a request asks for; the rules judge everything
the change does. Where they disagreed, the honest node's change was
refused by every other node, and with signatures required the node was
refused as a whole. The plan had both gates run the same judgement.
Under a policy, each change a node makes (its own writes and those
through the API) is now judged by rules::judge as receivers will judge
it, before it is signed or sent; one every node would refuse is rolled
back (the document forked at the heads before it, same actor: the
change never left) and the request refused with 403 (StoreError::
Refused). rules::judge_held, judging a change the document holds,
moves from swarm::refusals to access::rules for both.
The simulations that play a member past its own checks write with a
helper that bypasses them (forge).
Review finding 3 (the same judgement at both gates).
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A REFUSALS naming the swarm's first change made the node receiving it
judge that change again in a document that isn't empty, refuse it as
"a change without dependencies that isn't the epoch's root", and drop
it with everything built on it: its whole document.
The first epoch's root is now the first change a document holds, as it
comes to an empty one or as it is in one; a change judged again on a
peer's word is never refused for having no dependencies; and
drop_taken refuses to drop an epoch's root, or anything that would
leave nothing kept, logging an error instead.
Review finding 1 (critical).
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A node refusing changes a peer brought tells it which broke a rule; the
peer judges them itself, and if its rules refuse them too, drops them
with all built on them (its document forked without them, a fresh
actor), quarantining its own writes among them. Wire version 42.
Auth plan M6 (rejoin on taint).
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