µMatrix for Chromium

[Under development: usable, but not stable, many things broken because in the midst of general refactoring]

Forked from HTTP Switchboard.

Differences with HTTP Switchboard:

• No pattern-based filtering -- use more advanced µBlock for this
• Rules from broader scopes propagate to narrower scopes (HTTP Switchboard issue #227):
  • This means rules in global scope are ubiquitous, i.e. no longer sandboxed
  • See matrix as really 3D: evaluation order: Z, then X and Y, where
    • Z is the source hostname axis (aka "scope"), from narrower scopes to global scope
    • X is the request type axis: *, cookie, css, etc.
    • Y is the destination hostname axis (www.example.com, example.com, com, *)
  • Thus, every request is evaluated starting from the scope as per request's hostname, down to global scope if no explicit rule is found on the way down.
  • Switching scopes in matrix popup does not create/delete scopes, this just allows a user to modify rules in a specific scope
    • Rules in narrower scope(s) still exist and are enforced even if you have the global scope selected
• Settings which no longer exist:
  • "Enable strict blocking": This is the only available mode. Strict-blocking was added at some point during HTTPSB development, and at the time I kept "loose blocking" just to not upset the users who already got used to this way of working.
  • "Auto create temporary [domain | site]-level scope": Not needed anymore with the new literal 1st-party row. Set rules on the 1st-party row in the global scope: these rules will be inherited by whatever row is deemed first-party to the URL in the address bar.
  • "Copy all rules from global scope into newly created local scopes": Not needed anymore since all scopes virtually exist at all time.
  • "Auto delete unused temporary scopes": Again, not needed anymore since all scopes virtually exist at all time.
• Much needed code refactoring toward portability/efficiency
  • Big chunks of tired code have been removed, or replaced by small chunks of better code
  • There is no longer a hierarchical data structures for scopes/rules (major contribution toward code simplification)
  • Thus no need to manage the creation/deletion of scopes (and related settings)
  • All scopes virtually exist at all time.
  • The popup matrix simply activate whatever last scope level was in use

License

GPLv3.