argv

#!/bin/bash

# ----------------------------------------------------------------------------------------
# GENERAL INFORMATION
# ----------------------------------------------------------------------------------------
#
# Written by Andrew J Freyer
# GNU General Public License
# http://github.com/andrewjfreyer/monitor
#
# HELP FILE AND GENERAL PREFERENCES
#
# ----------------------------------------------------------------------------------------

#----------------------------------------------------------------------------------------
# REPORT CURRENT VERSION 
# ----------------------------------------------------------------------------------------

previous_version=$(cat ".previous_version")

#DETERMINE IF UPDATED SINCE LAST RUN
if [ "$previous_version" != "$version" ]; then 

	#HAVE WE REPORTED AN UPDATE BEFORE?
	[ -z "$previous_version" ] && previous_version="Unknown"
	
	#UPDATE REPORT
	printf "%s\n" "> ${GREEN}updated${NC} $(basename "$0") (v. $previous_version) -> (v. $version)..."

	#RECORD UPDATED VERSION
	printf "%s\n" "$version" > ".previous_version"
else 
	#STANDARD RUN
	printf "%s\n" "> ${GREEN}starting${NC} $(basename "$0") (v. $version)..."
fi 

# ----------------------------------------------------------------------------------------
# HELP TEXT
# ----------------------------------------------------------------------------------------

show_help_text() {
	#SHOW HELPFULE
	printf "%s\n" "

monitor.sh

Andrew J Freyer, 2018
https://github.com/andrewjfreyer/monitor

GNU General Public License

usage:

	monitor -h 	show usage information
	monitor -R 	redact private information from logs
	monitor -S 	silent operation (no logging)
	monitor -c addr	create connection to bluetooth device
	monitor -C 	clean retained messages from MQTT broker

	monitor -V	print verbose/debug logging messages
	monitor -v	print version number
	monitor -d	restore to default behavior_preferences
	monitor -u	update 'monitor.service' to current command line settings
			(excluding -u,-V, -F, and -d flags)

	monitor -r	repeatedly scan for arrival & departure of known devices
	monitor -s  report all mqtt messages to a single topic with 
				\$mqtt_topicpath/\$mqtt_publisher_identity  (defined in MQTT preferences file)

	monitor -f	format MQTT topics with only letters and numbers
	monitor -a	report all known device scan results, not just changes
	monitor -x	retain mqtt status messages
	monitor -b	report bluetooth beacon advertisements (e.g., generic beacons, ibeacons, and so on)
	monitor -t[adr]	scan for known devices only on mqtt trigger messages:
				a \$mqtt_topicpath/scan/ARRIVE (defined in MQTT preferences file)
				d \$mqtt_topicpath/scan/DEPART (defined in MQTT preferences file)
				r send ARRIVE or DEPART messages to trigger other devices to scan 
	monitor -D [dir]	use alternative directory for configuration files
	"
}

# ----------------------------------------------------------------------------------------
# PROCESS OPTIONS (technique: https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash)
# ----------------------------------------------------------------------------------------

#REMOVE MANUFACTURER CACHE AND PUBLIC NAME CACHE FROM PREVIOUS SESSION 
(&>/dev/null rm ".manufacturer_cache") && $PREF_VERBOSE_LOGGING && printf "%s\n" "> removing web request caches"

#NO LONGER REQUIRED; NAME CACHING SHOULD BE STICKY
#(&>/dev/null rm ".public_name_cache") && printf "%s\n" "> removing public name cache"

#PROCESS ARGV OPTIONS
OPTIND=1

#PREFERENCES
PREF_BEACON_MODE=false
PREF_TRIGGER_MODE_ARRIVE=false
PREF_TRIGGER_MODE_DEPART=false
PREF_TRIGGER_MODE_REPORT_OUT=false
PREF_BEACON_MODE=false
PREF_REPORT_ALL_MODE=false
PREF_RESTORE_DEFAULTS=false
PREF_UPDATE_SERVICE=false
PREF_REDACT=false
PREF_SHOULD_RETAIN=false
PREF_CLEAN_MQTT=false
PREF_FORMAT_MQTT=false
PREF_MQTT_REPORT_SCAN_MESSAGES=false
PREF_SERVICE_CHECK=true
PREF_CONFIG_DIR=''
PREF_DISABLE_LOGGING=false
PREF_VERBOSE_LOGGING=false
PREF_FILTER_DEBUG_LOGGING=false
PREF_MQTT_SINGLE_TOPIC_MODE=false
PREF_PERIODIC_MODE=false

while getopts "h?vfFbut:EgSRCmrsVadxD:c:" opt; do
	case "$opt" in
		h|\?)
			show_help_text
			exit 0
			;;
		S)
			PREF_DISABLE_LOGGING=true && printf "%s\n" "> logging is disabled, although startup messages will still be shown"
			;;

		r)  PREF_PERIODIC_MODE=true 
			printf "%s\n" "> ${ORANGE}warning:${NC} periodic scan mode may cause interference with 2.4GHz networks if run on a Raspberry Pi"
			;;
		v)  
			printf "%s\n" "$VERSION"
			exit 0
			;;
		F)  
			PREF_FILTER_DEBUG_LOGGING=true && printf "%s\n" "> ${ORANGE}warning:${NC} filter logging is enabled. this setting is only for informational and debug purposes"
			;;
		V)  
			PREF_VERBOSE_LOGGING=true && printf "%s\n" "> ${ORANGE}warning:${NC} verbose logging is enabled. this setting is only for informational and debugging purposes"
			;;
		c) 
			#GET TARGET MAC ADDRESS
			target_mac="$OPTARG"
			
			#REMOVE PREVIOUS PAIRINGS		
			printf "%s\n" "> removing previous pairings to $target_mac"
			(echo -e "remove $target_mac" | bluetoothctl &>/dev/null)

			#DEBUG ECHO
			printf "%s\n" "> creating connection to $target_mac..."
			printf "%s\n" "> witihin 5 seconds, please set $target_mac to discoverable..."
			
			#WAIT 5 SECONDS FOR DISCOVERABLE MODE
			sleep 5

			#CREATE CONNECTION
			return_data=$(hcitool cc $target_mac 2>&1 && hcitool auth $target_mac 2>&1 && hcitool dc $target_mac 2>&1)

			#ERROR REPORTING
			[[ $return_data =~ .*error.* ]] && printf "%s\n" "> ${RED}error: ${NC}connection to $target_mac failed" || printf "%s\n" "> connection created to $target_mac"

			exit 0
			;;
		C)  
			PREF_CLEAN_MQTT=true && printf "%s\n" "> cleaning retained messages on broker"
			;;
		E)  PREF_MQTT_REPORT_SCAN_MESSAGES=true && printf "%s\n" "> publishing MQTT .../scan/[arrival|depart]/[start|end]"
			;;
		s)  PREF_MQTT_SINGLE_TOPIC_MODE=true && printf "%s\n" "> publishing all MQTT presence messages to \$mqtt_topicpath/\$mqtt_publisher_identity"
			;;
		x)  PREF_SHOULD_RETAIN=true  && printf "%s\n" "> retaining mqtt status reports"
			;;
		R)  PREF_REDACT=true  && printf "%s\n" "> private information redacted from logs"
			;;
		d)  PREF_RESTORE_DEFAULTS=true 	&& printf "%s\n" "> restoring default settings"
			;;
		u)  PREF_UPDATE_SERVICE=true 	&& printf "%s\n" "> updating monitor.service"
			;;
		f)  PREF_FORMAT_MQTT=true 		&& $PREF_VERBOSE_LOGGING && printf "%s\n" "> only allow letters, numbers, and spaces in mqtt topic paths"
			;;
		b)  PREF_BEACON_MODE=true 		&& $PREF_VERBOSE_LOGGING && printf "%s\n" "> generic bluetooth beacon, ibeacon, and known beacon address reporting mode enabled"
			;;
		t)  #DO WE INCLUDE THE REPORTING TRIGGER?
			[[ $OPTARG = *r* ]] && PREF_TRIGGER_MODE_REPORT_OUT=true && $PREF_VERBOSE_LOGGING && printf "%s\n" "> trigger mode: report out MQTT arrive/depart scan triggers to other devices" 
			#SORT THROUGH REMAINING FILTERS
			case "$OPTARG" in 
				r)	PREF_TRIGGER_MODE_REPORT_OUT=true
					;;
				d|rd|dr)	PREF_TRIGGER_MODE_DEPART=true && $PREF_VERBOSE_LOGGING && printf "%s\n" "> trigger mode: depart scan only on MQTT trigger" 
					;;
				a|ra|ar)	PREF_TRIGGER_MODE_ARRIVE=true && $PREF_VERBOSE_LOGGING && printf "%s\n" "> trigger mode: arrive scan only on MQTT trigger" 
					;;
				da|ad|rda|rad|dra|ard|dar|adr) PREF_TRIGGER_MODE_ARRIVE=true && PREF_TRIGGER_MODE_DEPART==true && $PREF_VERBOSE_LOGGING && printf "%s\n" "> trigger mode: scan only (both on arrive and depart) on trigger" 
					;;
				*) printf "%s\n" "> ${ORANGE}warning: ${NC}unknown trigger mode: $OPTARG"
				;;
			esac
			;;
		a)  PREF_REPORT_ALL_MODE=true && $PREF_VERBOSE_LOGGING && printf "%s\n" "> report all scan results mode enabled"
			;;
        D)  PREF_CONFIG_DIR=$OPTARG && printf "%s\n" "> using custom config directory [$PREF_CONFIG_DIR]"
            [ ! -d "$PREF_CONFIG_DIR" ] && printf "%s\n" "> ${RED}error: ${NC}config directory [$PREF_CONFIG_DIR] doesn't exist" && exit 1
                ;;
		*)	printf "%s\n" "> unknown or depreciated argument: $opt"
	esac
done

#RESET OPTION INDEX
shift $((OPTIND-1))

#SHIFT IF NECESSARY
[ "$1" = "--" ] && shift