[tor-bugs] #3521 [Tor]: Allow controllers to retrieve HS descriptors from Tor

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#3521: Allow controllers to retrieve HS descriptors from Tor
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 Reporter:  rransom                |          Owner:  rransom         
     Type:  enhancement            |         Status:  new             
 Priority:  normal                 |      Milestone:  Tor: unspecified
Component:  Tor                    |        Version:                  
 Keywords:  needs-proposal tor-hs  |         Parent:                  
   Points:                         |   Actualpoints:                  
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Comment(by asn):

 Me and hellais wrote a small patch for this issue. You can find it in
 branch `bug8891` in `https://git.torproject.org/user/asn/tor.git`.

 It's a bit of a PoC and it was done the easiest way possible: You send
 `GETINFO hs/desc/id/idnxcnkne4qt76tg` to the control port, and Tor will
 search its cache of hidden service descriptors and if it finds a
 descriptor for `idnxcnkne4qt76tg.onion` it spits it out.

 In the future we will also want a command that actually fetches the
 descriptor even if it's not cached.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3521#comment:6>
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