mg-serial

#!/usr/bin/env bash
# mg-serial - Mac serial number generator

# The repo folder
gRepo=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)

# shellcheck source=mg-common
source "$gRepo/mg-common"

function help()
{
	echo "mg-serial v$gScriptVersion"
	echo "Mac serial number generator script"
	echo
	echo "Usage: mg-serial <product name> (arguments)"
	echo
	echo "     <product name>          Target Mac product name (model ID)"
	echo "     --help (-h)             Help (this screen)"
	echo
	echo "If no product name is specified, system values from the IORegistry will be used."
	exit 0
}

function generate_serial_number()
{
	# Source existing model data
	if [[ "$gProductName" =~ "iMac" ]]; then
		# shellcheck source=data/iMac.dat
		source "$gRepo/data/iMac.dat"
	elif [[ "$gProductName" =~ "MacBookAir" ]]; then
		# shellcheck source=data/MacBookAir.dat
		source "$gRepo/data/MacBookAir.dat"
	elif [[ "$gProductName" =~ "MacBookPro" ]]; then
		# shellcheck source=data/MacBookPro.dat
		source "$gRepo/data/MacBookPro.dat"
	elif [[ "$gProductName" =~ "MacBook" ]]; then
		# shellcheck source=data/MacBook.dat
		source "$gRepo/data/MacBook.dat"
	elif [[ "$gProductName" =~ "Macmini" ]]; then
		# shellcheck source=data/Macmini.dat
		source "$gRepo/data/Macmini.dat"
	elif [[ "$gProductName" =~ "MacPro" ]]; then
		# shellcheck source=data/MacPro.dat
		source "$gRepo/data/MacPro.dat"
	else
		print_error "Invalid model identifier!"
	fi

	# Generate the PPP value (manufacturing location)
	local PPPIndex=$(jot -r 1 0 $((${#PPPCodes[@]} - 1)))
	local PPP=${PPPCodes[PPPIndex]}
	if [ $gDebug -eq 1 ]; then
		local location=$(decode_location_val "$PPP")
		print_debug "Generated manufacturing location" "$location"
	fi

	# Generate the Y value (manufacturing year)
	local YIndex=$(jot -r 1 0 $((${#YCodes[@]} - 1)))
	local Y=${YCodes[YIndex]}
	if [ $gDebug -eq 1 ]; then
		local year=$(decode_year_val "$Y")
		print_debug "Generated manufacturing year" "201$year"
	fi

	# Generate the W value (manufacturing week)
	# Possible W values: 1-9, C, D, F-H, K-N, P-R, T-Y (no 0, A, B, E, I, O, S, or Z)
	local WCodes=('1' '2' '3' '4' '5' '6' '7' '8' '9' 'C' 'D' 'F' 'G' 'H' 'K' 'L' 'M' 'N' 'P' 'Q' 'R' 'T' 'U' 'V' 'W' 'X' 'Y')
	local WIndex=$(jot -r 1 0 $((${#WCodes[@]} - 1)))
	local W=${WCodes[WIndex]}
	if [ $gDebug -eq 1 ]; then
		local week=$(decode_week_val "$Y" "$W")
		print_debug "Generated manufacturing week" "$week"
	fi

	# Generate the SSS value (unique identifier)
	local base62=($(echo {0..9} {a..z} {A..Z}))
	local productionNumber=$(echo $((10000 + $RANDOM)) | cut -c 1-5)
	for i in $(bc <<< "obase=36; $productionNumber"); do
		echo "${base62[$((10#$i))]}" | tr '\n' ',' | tr -d ',' >> "/tmp/simpleMacSerial_SSS"
	done
	local SSS=$(tr '[:lower:]' '[:upper:]' < /tmp/simpleMacSerial_SSS)
	rm "/tmp/simpleMacSerial_SSS"
	if [ $gDebug -eq 1 ]; then
		print_debug "Generated unique identifier" "$SSS"
	fi

	# Generate the CCCC value (model identifer) from the model data
	local CCCCIndex=$(jot -r 1 0 $((${#CCCCCodes[@]} - 1)))
	local CCCC=${CCCCCodes[CCCCIndex]}
	if [ $gDebug -eq 1 ]; then
		print_debug "Generated model identifier" "$CCCC"
	fi

	gSerialNumber="$PPP$Y$W$SSS$CCCC"
}


# Were any valid arguments supplied?
if [ $# -eq 1 ]; then
	# Print the help menu if it was requested
	case "$1" in
		-h|--help)
			help
			exit
			;;
	esac
	# Yes. Set gProductName to the supplied model ID
	gProductName="$1"
else
	# No. Use the system model ID (from the IORegistry)
	gProductName=$(ioreg -k product-name -d 2 | awk '/product-name/ {print $3}' | tr -d '"<>')
	if [ $gDebug -eq 1 ]; then
		print_debug "NOTE" "No input product name found, using IORegistry value ($gProductName)"
	fi
fi

generate_serial_number
if [ $gDebug -eq 1 ]; then
	echo
	print_debug "Generated $gProductName serial number" "$gSerialNumber"
else
	echo "$gSerialNumber"
fi