Allow Controllers to return a wider range of "response-like" objects


Allow Controllers to return a wider range of "response-like" objects

Ref T1806. Ref T5752. Currently, handleRequest() needs to return an AphrontResponse, but sometimes it's really convenient to return some other object, like a Dialog, and let that convert into a response elsewhere.

Formalize this and clean up some of the existing hacks for it so there's less custom/magical code in Phabricator-specific classes and more general code in Aphront classes.

More broadly, I want to clean up T5752 before pursuing T9132, since I'm generally happy with how SearchEngine works except for how it interacts with side navs / application menus. I want to fix that first so a new Editor (which will have a lot in common with SearchEngine in terms of how controllers interact with it) doesn't make the problem twice as bad.

Test Plan:

  • Loaded a bunch of normal pages.
  • Loaded dialogs.
  • Loaded proxy responses (submitted empty comments in Maniphest).

Reviewers: chad

Reviewed By: chad

Subscribers: joshuaspence

Maniphest Tasks: T1806, T5752

Differential Revision: https://secure.phabricator.com/D14032