[tor-bugs] #15244 [Tor]: Add helper functin that validates a .onion address

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#15244: Add helper functin that validates a .onion address
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     Reporter:  dgoulet      |      Owner:  dgoulet
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor          |    Version:
   Resolution:               |   Keywords:  tor-hs
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by dgoulet):

 Replying to [comment:3 nickm]:
 > A lot of this logic is in parse_extended_hostname; you could refactor it
 out of there, but you'd need to split out the part that changes the
 address.

 I agree, I would do a simple refactor here to create a "is valid onion
 address" function that `parse_extended_hostname` could use. Simple move
 around code so we can have one that validates and can take a const char
 and the other can parse it like it does right now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15244#comment:5>
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