I am making a signin script

So what i want to do is have a default entry and password (default: user=User and password=password) and then you can register in the program, and it will save to a computer either online (when I learn rednet, that would be cool!) or internally in the computer, and I want unlimited entry space, not just one. So "Jim" could logon then logoff and then "Karen" could logon. Could anyone help?

You'll want to use a table of username/password pairs stored in a separate file. It'll probably be easiest to manage if you use the username as the key and the password as the value, rather than two numerically-indexed tables.

To do this, you could save the usernames and passwords on a file in the computer, and when the user enters their credentials, you could check if it is the same as any of the ones in the file. To add more, you just keep appending to the file. The file could also contain the default username and password.

Example:

-- I'll leave the GUI up to you
local enteredUser = "this is the entered username"
local enteredPass = "this is the entered password"

local f = io.open("/credentials", "r")
local available = textutils.unserialize(f:read("*l"))
f:close()

local isCorrect = false
for k, v in pairs(available) do
  if enteredUser == k and enteredPass == v then
	isCorrect = true
	break
  end
end

if isCorrect then
  -- Login
end

Example /credentials file:

{["Jim"] = "jimspassword", ["Karen"] = "karenspassword"}

Example add username program:

-- I'll leave the GUI up to you
local newUser = "this is the new username"
local newPass = "this is the new password"

local f = io.open("/credentials", "r")
local existing = textutils.unserialize(f:read("*l"))
f:close()

existing[newUser] = newPass
local f = io.open("/credentials", "w")
f:write(textutils.serialize(existing))
f:close()

Note: this does not include encryption, salting, or checking if the file exists/contents is valid.

GravityScore, on 11 January 2013 - 06:35 AM said:

Example /credentials file:

{"Jim" = "jimspassword", "Karen" = "karenspassword"}

A minor correction: "Jim" would need to either be Jim or ["Jim"] (I believe textutils.serialize produces the latter); likewise for "Karen".

Lyqyd, on 11 January 2013 - 06:42 AM said:

GravityScore, on 11 January 2013 - 06:35 AM said:

Example /credentials file:

{"Jim" = "jimspassword", "Karen" = "karenspassword"}

A minor correction: "Jim" would need to either be Jim or ["Jim"] (I believe textutils.serialize produces the latter); likewise for "Karen".

Ahhh you're right! Thanks Lyqyd. I'll edit the post…

GravityScore, on 11 January 2013 - 06:35 AM said:

To do this, you could save the usernames and passwords on a file in the computer, and when the user enters their credentials, you could check if it is the same as any of the ones in the file. To add more, you just keep appending to the file. The file could also contain the default username and password.

Example:

-- I'll leave the GUI up to you
local enteredUser = "this is the entered username"
local enteredPass = "this is the entered password"

local f = io.open("/credentials", "r")
local available = textutils.unserialize(f:read("*l"))
f:close()

local isCorrect = false
for k, v in pairs(available) do
  if enteredUser == k and enteredPass == v then
	isCorrect = true
	break
  end
end

if isCorrect then
  -- Login
end

Example /credentials file:

{["Jim"] = "jimspassword", ["Karen"] = "karenspassword"}

Example add username program:

-- I'll leave the GUI up to you
local newUser = "this is the new username"
local newPass = "this is the new password"

local f = io.open("/credentials", "r")
local existing = textutils.unserialize(f:read("*l"))
f:close()

existing[newUser] = newPass
local f = io.open("/credentials", "w")
f:write(textutils.serialize(existing))
f:close()

Note: this does not include encryption, salting, or checking if the file exists/contents is valid.

So I did this… I added like 10 usernames and random passcodes… will this stay there if I break the computer(I have the credentials on a floppy) or the computer is shut down?

GravityScore, on 11 January 2013 - 06:35 AM said:

To do this, you could save the usernames and passwords on a file in the computer, and when the user enters their credentials, you could check if it is the same as any of the ones in the file. To add more, you just keep appending to the file. The file could also contain the default username and password.

Example:

-- I'll leave the GUI up to you
local enteredUser = "this is the entered username"
local enteredPass = "this is the entered password"

local f = io.open("/credentials", "r")
local available = textutils.unserialize(f:read("*l"))
f:close()

local isCorrect = false
for k, v in pairs(available) do
  if enteredUser == k and enteredPass == v then
	isCorrect = true
	break
  end
end

if isCorrect then
  -- Login
end

Example /credentials file:

{["Jim"] = "jimspassword", ["Karen"] = "karenspassword"}

Example add username program:

-- I'll leave the GUI up to you
local newUser = "this is the new username"
local newPass = "this is the new password"

local f = io.open("/credentials", "r")
local existing = textutils.unserialize(f:read("*l"))
f:close()

existing[newUser] = newPass
local f = io.open("/credentials", "w")
f:write(textutils.serialize(existing))
f:close()

Note: this does not include encryption, salting, or checking if the file exists/contents is valid.

Actually!
I realized(failtest) that Now I cannot add more than one person…. I have tried to change the code.. and it screws it up.
Here is the code for register:

textutils.slowPrint("Registry:")
local newUser = read()
local newPass = read()

local f = io.open("disk/credentials", "r")
local existing = textutils.unserialize(f:read("*l"))
f:close()

existing[newUser] = newPass
local f = io.open("/credentials", "w")
f:write(textutils.serialize(existing))
f:close()

Here is the login:

print("MineOS TEST")
write("Username: ")
local enteredUser = read()
write("Password: ")
local enteredPass = read("*")

local f = io.open("disk/credentials", "r")
local available = textutils.unserialize(f:read("*l"))
f:close()

local isCorrect = false
for k, v in pairs(available) do
  if enteredUser == k and enteredPass == v then
        isCorrect = true
        break
  end
end

if isCorrect then
  textutils.slowWrite("Validating...")
  sleep(1)
  textutils.slowWrite("Logging on...")
  shell.run("cd disk")
  shell.run("clear")
else
  textutils.slowPrint("Validating...")
  sleep(1)
  textutils.slowPrint("Name not in database")

end

I might have the credentials wrong…

They should persist across shutdowns regardless, I believe. Labeling the computer will make them persist across breakings. Use the label program: label set <name>

Edit: in the register program, you are reading from disk/credentials and writing the updated list to /credentials. You then read from disk/credentials in the main login program. Updating the register program to write to disk/credentials should fix it.

GOT IT THANKSS>>>>>>>>>>>