Resolve #1

tg_client/tg_client.lua

@@ -1,3 +1,5 @@
+tg_server_name = "tg_server"
+
 local args = {...}
 
 local function split(str, divider)
@@ -21,7 +23,7 @@ local function establish_connection()
     return false
 end
 
-function validate_clearance(computer_id, clearance_level, tg_server_name)
+function validate_clearance(computer_id, clearance_level)
     if establish_connection() then
         tg_server_id = rednet.lookup("tg", tg_server_name)
         rednet.send(tg_server_id, "validate_clearance,"..computer_id..","..clearance_level)
@@ -36,12 +38,31 @@ function validate_clearance(computer_id, clearance_level, tg_server_name)
     end
 end
 
+function validate_key(minimum_clearance)
+    if establish_connection() then
+        if fs.exists("/disk/key") then
+            key_file = fs.open("/disk/key","r")
+            key = key_file.readLine()
+            tg_server_id = rednet.lookup('tg', tg_server_name)
+            rednet.send(tg_server_id, "validate_key,"..key..","..minimum_clearance, "tg")
+            id, msg, _ = rednet.receive("tg")
+            if msg == "authentication successful" then
+                return true
+            else
+                return false, "authentication error: "..msg
+            end
+        else
+            return false, "key file not found"
+        end
+    else
+        return false, "modem not found"
+    end
+end
+
 if fs.exists('/disk/key') then
     key_file = fs.open('/disk/key', 'r')
     key = key_file.readLine()
     if establish_connection() then
-        local tg_server_name = "tg_server"
-
         tg_server_id = rednet.lookup("tg", tg_server_name)
         rednet.send(tg_server_id, "authenticate,"..key,"tg")
         local id, msg, proto = rednet.receive("tg")