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local sys = require "system"
print [[
This example shows how to disable the "echo" of characters read to the console,
useful for reading secrets from the user.
]]
--- Function to read from stdin without echoing the input (for secrets etc).
-- It will (in a platform agnostic way) disable echo on the terminal, read the
-- input, and then re-enable echo.
-- @param ... Arguments to pass to `io.stdin:read()`
-- @return the results of `io.stdin:read(...)`
local function read_secret(...)
local w_oldflags, p_oldflags
if sys.isatty(io.stdin) then
-- backup settings, configure echo flags
w_oldflags = sys.getconsoleflags(io.stdin)
p_oldflags = sys.tcgetattr(io.stdin)
-- set echo off to not show password on screen
assert(sys.setconsoleflags(io.stdin, w_oldflags - sys.CIF_ECHO_INPUT))
assert(sys.tcsetattr(io.stdin, sys.TCSANOW, { lflag = p_oldflags.lflag - sys.L_ECHO }))
end
local secret, err = io.stdin:read(...)
-- restore settings
if sys.isatty(io.stdin) then
io.stdout:write("\n") -- Add newline after reading the password
sys.setconsoleflags(io.stdin, w_oldflags)
sys.tcsetattr(io.stdin, sys.TCSANOW, p_oldflags)
end
return secret, err
end
-- Get username
io.write("Username: ")
local username = io.stdin:read("*l")
-- Get the secret
io.write("Password: ")
local password = read_secret("*l")
-- Get domainname
io.write("Domain : ")
local domain = io.stdin:read("*l")
-- Print the results
print("")
print("Here's what we got:")
print(" username: " .. username)
print(" password: " .. password)
print(" domain : " .. domain)
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