MFFS Controller for devillwithin - Revision #2

-- * configuration
local usernamesToAccept = {
    "yourUserame",
    "otherUserame",
    "LBPHacker"
}
local innerMonitorName = "monitor_0"
local outerMonitorName = "monitor_1"
local outerDetectorName = "playerDetector_0"
local redstoneOutput = "bottom"

-- * calls the same methods of the two monitors
local callMonitorMethod = function(...)
    -- * I used peripheral.call in the end - no need of wrapping the monitors up
    peripheral.call(innerMonitorName, ...)
    peripheral.call(outerMonitorName, ...)
end

-- * updates the redstone output and the monitor
local toggleOutput = function()
    local current = not rs.getOutput(redstoneOutput)
    rs.setOutput(redstoneOutput, current) -- * toggles the output
    callMonitorMethod("setBackgroundColor", current and colors.lime or colors.red)
    callMonitorMethod("clear")
    callMonitorMethod("setCursorPos", 2, 3)
    callMonitorMethod("write", current and "MFFS: [ON]| OFF " or "MFFS:  ON |[OFF]")
end

-- * checks for access
local hasAccess = function(username)
    local access = false
    for ixUser = 1, #usernamesToAccept do access = usernamesToAccept[ixUser] == username or access end -- * gives access sooner or later if the username is in the table 'usernamesToAccept'
    return access
end

callMonitorMethod("setTextColor", colors.white)
rs.setOutput(redstoneOutput, false) -- * change false to true if you want the MFFS to be off by default
toggleOutput()

-- * endless loop
while true do
    local eventData = {os.pullEvent()} -- * puts the event data into a table
    -- * every monitor sends a monitor_touch
    -- * (eventData[1] == "player" and hasAccess(eventData[2])):
    --        will return true if the event was player and the username can be found
    --        in the list of users permitted to toggle the MFFS power - again, call for
    --        hasAccess won't execute if the event wasn't player
    if eventData[1] == "monitor_touch" or eventData[1] == "player" and hasAccess(eventData[2]) then
        -- * nothing is on the monitor apart from the button
        --   which toggles the MFFS, so no need of fancy button APIs
        toggleOutput()
    end
end