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[feature] proof of work scraper deterrence (#4043)

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This adds a proof-of-work based scraper deterrence to GoToSocial's middleware stack on profile and status web pages. Heavily inspired by https://github.com/TecharoHQ/anubis, but massively stripped back for our own usecase.

Todo:
- ~~add configuration option so this is disabled by default~~
- ~~fix whatever weirdness is preventing this working with CSP (even in debug)~~
- ~~use our standard templating mechanism going through apiutil helper func~~
- ~~probably some absurdly small performance improvements to be made in pooling re-used hex encode / hash encode buffers~~ the web endpoints aren't as hot a path as API / ActivityPub, will leave as-is for now as it is already very minimal and well optimized
- ~~verify the cryptographic assumptions re: using a portion of token as challenge data~~ this isn't a serious application of cryptography, if it turns out to be a problem we'll fix it, but it definitely should not be easily possible to guess a SHA256 hash from the first 1/4 of it even if mathematically it might make it a bit easier
- ~~theme / make look nice??~~
- ~~add a spinner~~
- ~~add entry in example configuration~~
- ~~add documentation~~

Verification page originally based on https://github.com/LucienV1/powtect

Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4043
Reviewed-by: tobi <tsmethurst@noreply.codeberg.org>
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>
This commit is contained in:
kim
2025-04-28 20:12:27 +00:00
committed by kim
parent 2b82fa7481
commit d8c4d9fc5a
16 changed files with 759 additions and 19 deletions
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15
internal/middleware/headerfilter.go
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@ -150,11 +150,6 @@ func isHeaderBlocked(state *state.State, c *gin.Context) (bool, error) {
}
if key != "" {
// if expr != "" {
// // TODO: replace expvar with build
// // taggable metrics types in State{}.
// }
// A header was matched against!
// i.e. this request is blocked.
return true, nil
@ -185,11 +180,6 @@ func isHeaderAllowed(state *state.State, c *gin.Context) (bool, error) {
}
if key != "" {
// if expr != "" {
// // TODO: replace expvar with build
// // taggable metrics types in State{}.
// }
// A header was matched against!
// i.e. this request is allowed.
return true, nil
@ -220,11 +210,6 @@ func isHeaderNotAllowed(state *state.State, c *gin.Context) (bool, error) {
}
if key != "" {
// if expr != "" {
// // TODO: replace expvar with build
// // taggable metrics types in State{}.
// }
// A header was matched against!
// i.e. request is NOT allowed.
return true, nil