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fix(fetcher): require fetched documents to have the fetched id

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The fetcher accepted any document whose id was on the same host as the
fetch URL. Anyone who can place a JSON file on a host, for example
through an upload, could pass it off as another object or actor from
that host.

The id of a fetched document must now be the URL it came from (after
redirects), ignoring a trailing slash, the fragment, the host case and
differences that our URL encoding removes.
If it differs, as for Mastodon's /@user/123 display URLs, we refetch
once from that id, which must be on the same host. The refetch must
not redirect and must match exactly.

Test mocks that served a document under a different URL now serve it
from its own id.

Based on Akkoma 8684964c5 and 940792f8b.
This commit is contained in:
Lain Soykaf 2026-10-27 21:45:14 +04:00
commit 20354e0aee
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8 changed files with 259 additions and 15 deletions
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6
test/fixtures/tesla_mock/relay@mastdon.example.org.json vendored
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@ -11,7 +11,7 @@
"toot": "http://joinmastodon.org/ns#",
"Emoji": "toot:Emoji"
}],
"id": "http://mastodon.example.org/users/admin",
"id": "http://mastodon.example.org/users/relay",
"type": "Application",
"invisible": true,
"following": "http://mastodon.example.org/users/admin/following",
@ -24,8 +24,8 @@
"url": "http://mastodon.example.org/@admin",
"manuallyApprovesFollowers": false,
"publicKey": {
"id": "http://mastodon.example.org/users/admin#main-key",
"owner": "http://mastodon.example.org/users/admin",
"id": "http://mastodon.example.org/users/relay#main-key",
"owner": "http://mastodon.example.org/users/relay",
"publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtc4Tir+3ADhSNF6VKrtW\nOU32T01w7V0yshmQei38YyiVwVvFu8XOP6ACchkdxbJ+C9mZud8qWaRJKVbFTMUG\nNX4+6Q+FobyuKrwN7CEwhDALZtaN2IPbaPd6uG1B7QhWorrY+yFa8f2TBM3BxnUy\nI4T+bMIZIEYG7KtljCBoQXuTQmGtuffO0UwJksidg2ffCF5Q+K//JfQagJ3UzrR+\nZXbKMJdAw4bCVJYs4Z5EhHYBwQWiXCyMGTd7BGlmMkY6Av7ZqHKC/owp3/0EWDNz\nNqF09Wcpr3y3e8nA10X40MJqp/wR+1xtxp+YGbq/Cj5hZGBG7etFOmIpVBrDOhry\nBwIDAQAB\n-----END PUBLIC KEY-----\n"
},
"attachment": [{