show "upgrade" message on invalid connection request (#164)

src/Simplex/Chat.hs

@@ -72,7 +72,7 @@ data ChatCommand
   | MarkdownHelp
   | Welcome
   | AddContact
-  | Connect AConnectionRequest
+  | Connect (Maybe AConnectionRequest)
   | ConnectAdmin
   | SendAdminWelcome ContactName
   | DeleteContact ContactName
@@ -203,8 +203,9 @@ processChatCommand user@User {userId, profile} = \case
     (connId, cReq) <- withAgent (`createConnection` SCMInvitation)
     withStore $ \st -> createDirectConnection st userId connId
     showInvitation cReq
-  Connect (ACR SCMInvitation cReq) -> connect cReq (XInfo profile) >> showSentConfirmation
-  Connect (ACR SCMContact cReq) -> connect cReq (XContact profile Nothing) >> showSentInvitation
+  Connect (Just (ACR SCMInvitation cReq)) -> connect cReq (XInfo profile) >> showSentConfirmation
+  Connect (Just (ACR SCMContact cReq)) -> connect cReq (XContact profile Nothing) >> showSentInvitation
+  Connect Nothing -> showInvalidConnReq
   ConnectAdmin -> connect adminContactReq (XContact profile Nothing) >> showSentInvitation
   SendAdminWelcome cName -> forM_ adminWelcomeMessages $ sendMessageCmd cName
   DeleteContact cName ->
@@ -1187,7 +1188,7 @@ chatCommandP =
     <|> ("/groups" <|> "/gs") $> ListGroups
     <|> A.char '#' *> (SendGroupMessage <$> displayName <* A.space <*> A.takeByteString)
     <|> ("/contacts" <|> "/cs") $> ListContacts
-    <|> ("/connect " <|> "/c ") *> (Connect <$> connReqP)
+    <|> ("/connect " <|> "/c ") *> (Connect <$> ((Just <$> connReqP) <|> A.takeByteString $> Nothing))
     <|> ("/connect" <|> "/c") $> AddContact
     <|> ("/delete @" <|> "/delete " <|> "/d @" <|> "/d ") *> (DeleteContact <$> displayName)
     <|> A.char '@' *> (SendMessage <$> displayName <*> (A.space *> A.takeByteString))

src/Simplex/Chat/View.hs

@@ -10,6 +10,7 @@ module Simplex.Chat.View
     showInvitation,
     showSentConfirmation,
     showSentInvitation,
+    showInvalidConnReq,
     showChatError,
     showContactDeleted,
     showContactGroups,
@@ -113,6 +114,15 @@ showSentConfirmation = printToView ["confirmation sent!"]
 showSentInvitation :: ChatReader m => m ()
 showSentInvitation = printToView ["connection request sent!"]
 
+showInvalidConnReq :: ChatReader m => m ()
+showInvalidConnReq =
+  printToView
+    [ "Connection link is invalid!",
+      "Possibly, it was created in a newer version (to check version: " <> highlight' "/v" <> ")",
+      "To upgrade (Linux/Mac):",
+      "curl -o- https://raw.githubusercontent.com/simplex-chat/simplex-chat/master/install.sh | bash"
+    ]
+
 showChatError :: ChatReader m => ChatError -> m ()
 showChatError = printToView . chatError