Extend client api by authentication

tg_client/tg_client.lua

@@ -15,18 +15,16 @@ local function establish_connection()
     for _, side in ipairs(peripherals) do
         if peripheral.getType(side) == "modem" then
             rednet.open(side)
-            print("Opened modem: "..side)
             return true
         end
     end
-    print("No modem found!")
     return false
 end
 
 function validate_clearance(computer_id, clearance_level)
     if establish_connection() then
-        tg_server_id = rednet.lookup("tg", tg_server_name)
+        tg_server_id = rednet.lookup('tg', tg_server_name)
-        rednet.send(tg_server_id, "validate_clearance,"..computer_id..","..clearance_level)
+        rednet.send(tg_server_id, "validate_clearance,"..computer_id..","..clearance_level,"tg")
         local id, msg, proto = rednet.receive("tg")
         if msg == "granted" then
             return true
@@ -41,11 +39,11 @@ end
 function validate_key(minimum_clearance)
     if establish_connection() then
         if fs.exists("/disk/key") then
-            key_file = fs.open("/disk/key","r")
+            local key_file = fs.open("/disk/key","r")
-            key = key_file.readLine()
+            local 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")
+            local id, msg, _ = rednet.receive("tg")
             if msg == "authentication successful" then
                 return true
             else
@@ -59,27 +57,40 @@ function validate_key(minimum_clearance)
     end
 end
 
-if fs.exists('/disk/key') then
+function authenticate()
-    key_file = fs.open('/disk/key', 'r')
+    if fs.exists('/disk/key') then
-    key = key_file.readLine()
+        local key_file = fs.open('/disk/key', 'r')
+        local key = key_file.readLine()
         if establish_connection() then
             tg_server_id = rednet.lookup("tg", tg_server_name)
             rednet.send(tg_server_id, "authenticate,"..key,"tg")
             local id, msg, proto = rednet.receive("tg")
 
             if msg == "authentication successful" then
-            key_parts = split(key,',')
+                local key_parts = split(key,',')
                 local card_holder = key_parts[1]
                 local card_clearance = key_parts[2]
-            print("Authentication was successful.")
+                return true, _, card_holder, card_clearance
-            print("Hello "..card_holder..", you were granted clearance level "..card_clearance.." for this computer.")
             else
                 print("Authentication failed.")
+                return false, "authentication failed"
             end
         else
             return false, "modem not found"
         end
         key_file.close()
-else
+    else
         print("Key file not found. Aborting.")
+        return false, "key file not found"
+    end
+end
+
+if args[1] == "auth" or args[1] == "authenticate" then
+    local success, error, card_holder, card_clearance = authenticate()
+    if success then
+        print("Authentication was successful.")
+        print("Hello "..card_holder..", you were granted clearance level "..card_clearance.." for this computer.")
+    else
+        print("Authentication failed: "..error)
+    end
 end