[tor-bugs] #8978 [Tor]: Write server-side pluggable transport options to extra-info descriptor

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#8978: Write server-side pluggable transport options to extra-info descriptor
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 Reporter:  asn            |          Owner:                    
     Type:  task           |         Status:  new               
 Priority:  normal         |      Milestone:  Tor: 0.2.5.x-final
Component:  Tor            |        Version:                    
 Keywords:  tor-bridge pt  |         Parent:                    
   Points:                 |   Actualpoints:                    
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 To correctly deploy pluggable transports that require pre-shared-secrets,
 like scramblesuit, we need to be able to pass the shared-secret of each
 bridge to BridgeDB.

 This is not currently implemented, and we need to implement the `ARGS`
 option of the `SMETHOD` line as detailed in `180-pluggable-transport.txt`.

 This is a ticket for the Tor side of this task. That is, parsing the
 `SMETHOD` line and writing stuff to the `extra-info` descriptors.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8978>
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