matrix-send/matrix-send

#!/usr/bin/env sh
# matrix-send: send a message to a Matrix room

version="1.0"

###########################
#### Generic Functions ####
###########################

error () {
	printf "\033[31;1merror:\033[0m $1\n"
	exit 1
}

conf_error () {
	printf "\033[31;1mconfiguration error:\033[0m $1\n"
	exit 2
}

vargrep () {
	printf "$2\n" | grep "$1" $3
}

usage () {
	printf "usage: matrix-send [-t type] [-c] [-h] [-V] message room\n"
	exit 1
}

help () {
	cat <<EOF
matrix-send: send a message to a Matrix room
Options:
   -t type:    change default event type
	-c:    clear cached access tokens
	-h:    show this help menu
	-V:    show version and program information

For more information, type 'man matrix-send'.
https://codeberg.org/jtbx/matrix-send
EOF
	exit 0
}

version () {
	cat <<EOF
matrix-send: send a message to a Matrix room
Version $version

matrix-send is licensed under the GNU General Public License v2.
Made in New Zealand
https://codeberg.org/jtbx/matrix-send
EOF
	exit 0
}

##################################
#### Configuration Directives ####
##################################

Server () {
	[ -z $1 ] && conf_error "No argument for directive Server"
	server="$1"
}

Username () {
	[ -z $1 ] && conf_error "No argument for directive Username"
	username="$1"
}

Password () {
	[ -z $1 ] && conf_error "No argument for directive Password"
	password="$@"
}

AccessToken () {
	[ -z $1 ] && conf_error "No argument for directive AccessToken"
	manualAuth="true"
	token="$1"
}

CacheLocation () {
	[ -z $1 ] && conf_error "No argument for directive CacheLocation"
	if vargrep "^/.+$" "$1" -Eq || \
		vargrep "^~.+$" "$1" -Eq;
	then cacheloc="$1";
	else conf_error "Cache location is not valid (does not begin with / or ~)"; fi
}

DefaultEvent () {
	[ -z $1 ] && conf_error "No argument for directive DefaultEvent"
	if vargrep "m\.(text|notice)" "$1" -Eo
	then defaultevent="$1"
	else conf_error "Invalid default event type"; fi
}

##################################
#### Configuration Statements ####
##################################

NoCache () {
	nocache="true"
}

############################
#### Specific Functions ####
############################

GetAccessToken () {
	[ -z "$manualAuth" ] && printf "Getting access token...\n"
	if [ "$manualAuth" = "true" ];
	then printf "";
	else token=$(curl -s -XPOST -d "{"'"'"type"'"'":"'"'"m.login.password"'"'", "'"'"user"'"'":"'"'"$username"'"'", "'"'"password"'"'":"'"'"$password"'"'"}" "https://$server/_matrix/client/r0/login" | grep -oE 'syt_.+_...................._......');
	fi
}

CacheAccessToken () {
	if [ "$nocache" = "true" ];
	then printf "";
	else
		mkdir -p "$cacheloc/matrix-send"
		printf "$token\n" > "$cacheloc/matrix-send/access-token";
	fi
}

ClearCache () {
	[ -e "$cacheloc/matrix-send/access-token" ] || printf "There is no cache to be cleared.\n"
	[ -e "$cacheloc/matrix-send/access-token" ] && rm -rf "$cacheloc/matrix-send/" && printf "Cleared cache\n"
	exit 0
}

Send () {
	curl -s -XPOST -d "{"'"'"msgtype"'"'":"'"'"$mtype"'"'", "'"'"body"'"'":"'"'"$message"'"'"}" "https://$server/_matrix/client/r0/rooms/%21$roomid/send/m.room.message?access_token=$token"
}

########################
#### Initial checks ####
########################

[ -e /usr/local/bin/curl ] || [ -e /usr/bin/curl ] || error "curl not found"
[ -z "$1" ] && usage
while getopts :t:chV opt
do
	case $opt in
		t)
			if vargrep "m\.(text|notice)" "$OPTARG" -Eo
			then
				mtype="$OPTARG"
				optind="$OPTIND"
			else error "Type not valid (-t)"
			fi
		;;
		c) ClearCache ;;
		h) help ;;
		V) version ;;
	esac
done

###############################
#### Configuration loading ####
###############################

# Set default config settings
CacheLocation "$HOME/.cache"

# Load configuration
if [ -e $HOME/.config/matrix-send.conf ]; 
then . $HOME/.config/matrix-send.conf;
else
	mkdir -p $HOME/.config
	touch $HOME/.config/matrix-send.conf
fi

# Run checks for essential directives
[ -z $server ] && conf_error "Server directive is not present"
[ -z $username ] && conf_error "Username directive is not present"
[ -z "$password" ] && conf_error "Password directive is not present"

##############
#### Main ####
##############

# Get token and cache it (unless NoCache is set)
[ -e "$cacheloc/matrix-send/access-token" ] && token=$(cat $cacheloc/matrix-send/access-token)
[ -e "$cacheloc/matrix-send/access-token" ] || GetAccessToken
CacheAccessToken

if [ -z "$2" ];
then error "Room ID not specified.";
else
	shift $((OPTIND-1))
	message="$1"
	roomid_input="$2"
	if [ -z "$mtype" ]; then mtype="$defaultevent"; fi;
	if vargrep '!' "$roomid_input" -qo
	then roomid="$(printf "$roomid_input" | sed 's/!//g')"
	else roomid="$roomid_input"; fi
	Send
fi