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In multi-user mode if Alice attempts to access /~bob/ she would get an
Unauthorized error since branches are private. To improve the UX we
instead already showed Alice a list of which files Bob has shared with
her. Previously this was achieved with an before_return_error hook
in the Controller trait.
While this worked fine, it wasn't elegant, since it required passing
the Context struct in all Unauthorized errors, so that the
before_return_error hook could access the context.
This commit refactors the code to intercept requests to paths like
/~bob/ before the regular request handling instead of afterwards.
While this could have been implemented in the before_route hook, this
would have required either invoking parse_url_path a second time or
passing the Result of parse_url_path, both of which would be akward.
Therefore this commit also merges before_route into parse_url_path.
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