agent: chat relay address type for short links (#1602)

Author: epoberezkin

apps/smp-server/static/link.html

@@ -512,6 +512,8 @@ <h2 class="text-xl font-bold">If you already installed SimpleX Chat for the term
         element.innerHTML = 'This is a one-time link of the SimpleX&nbsp;network user'
       } else if (url.includes('/c')) {
         element.innerHTML = 'This is a public channel address on SimpleX&nbsp;network'
+      } else if (url.includes('/r')) {
+        element.innerHTML = 'This is a chat relay address on SimpleX&nbsp;network'
       }
     }
   </script>

apps/smp-server/web/Static.hs

@@ -103,6 +103,7 @@ generateSite si onionHost sitePath = do
   createLinkPage "a"
   createLinkPage "c"
   createLinkPage "g"
+  createLinkPage "r"
   createLinkPage "i"
   logInfo $ "Generated static site contents at " <> tshow sitePath
   where

src/Simplex/Messaging/Agent/Protocol.hs

@@ -1445,7 +1445,7 @@ instance ConnectionModeI c => ToField (ConnShortLink c) where toField = toField
 
 instance (Typeable c, ConnectionModeI c) => FromField (ConnShortLink c) where fromField = blobFieldDecoder strDecode
 
-data ContactConnType = CCTContact | CCTChannel | CCTGroup deriving (Eq, Show)
+data ContactConnType = CCTContact | CCTChannel | CCTGroup | CCTRelay deriving (Eq, Show)
 
 data AConnShortLink = forall m. ConnectionModeI m => ACSL (SConnectionMode m) (ConnShortLink m)
 
@@ -1593,6 +1593,7 @@ ctTypeP = \case
   'A' -> pure CCTContact
   'C' -> pure CCTChannel
   'G' -> pure CCTGroup
+  'R' -> pure CCTRelay
   _ -> fail "unknown contact address type"
 {-# INLINE ctTypeP #-}
 
@@ -1601,6 +1602,7 @@ ctTypeChar = \case
   CCTContact -> 'A'
   CCTChannel -> 'C'
   CCTGroup -> 'G'
+  CCTRelay -> 'R'
 {-# INLINE ctTypeChar #-}
 
 -- the servers passed to this function should be all preset servers, not servers configured by the user.