typetalk

#!/bin/sh
# Usage: typetalk [-m MESSAGE] [-t TALK] [MESSAGE_FILE...]
#
# Options:
#    -m MESSAGE   a message to post
#    -t TALK      talk id to attach

# TYPETALK_TOPIC=123456
# TYPETALK_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

: ${ACCESSTOKEN_PATH:="${HOME}/.typetalk_config"}
MAX_MESSAGE_LENGTH="4000"

eecho() { echo "$*" > /dev/stderr; }

error() { eecho "Error: $*"; exit 1; }

command_exists() { command -v "$1" 1>/dev/null 2>&1; }

## Arguments:
##   commands... : required commands
##
## Return:
##   returns 0 if all commands are found, exit 1 if not
##
require_commands() {
	(
		missing=0
		for cmd; do
			if ! command_exists "$cmd"; then
				missing=1
				eecho "command missing - '$cmd'"
			fi
		done

		if [ "$missing" -gt 0 ]; then
			eecho
			eecho "To run this script, please install above commands."
			return 1
		fi
	) || exit 1
}

print_help() {
	sed -n '2,/^$/s/^# //p' "$0"
}

# If there are configured environment variables, exit with 0
config_exist() {
	[ -n "${TYPETALK_TOPIC}" -a -n "${TYPETALK_TOKEN}" ]
}

format_json() {
	if command_exists jq; then
		jq .
	else
		cat
	fi
}

load_config() {
	if config_exist; then
		return
	fi

	if ! [ -f "${ACCESSTOKEN_PATH}" ]; then
		error "No token specified. Configure an API token by configuration file or environment variables"
	fi

	if [ -z "`find "${ACCESSTOKEN_PATH}" -type f -perm 600 -print`" ]; then
		error "A configuration SHOULD NOT be readable or writable by other user. Execute \`chmod 600 \"${ACCESSTOKEN_PATH}\"\`."
	fi

	. "${ACCESSTOKEN_PATH}"
}

obtain_message() {
	if [ "$#" -ge 1 ]; then
		cat -- "$@"
	else
		cat
	fi
}

###

require_commands find sed grep cat wc printf curl

while getopts "hm:f:t:" option; do
	case "${option}" in
	h)
		print_help
		exit 1
		;;
	m)
		message="$OPTARG"
		;;
	t)
		talk="$OPTARG"
		if ! echo "$talk" | grep -q '^[0-9]\+$'; then
			error "Invalid format for talk: ${talk}"
		fi
		;;
	f)
		# Reserved for file upload
		eecho "currently not supported, ignored."
		;;
	\?)
		exit 1
		;;
	esac
done

shift $(($OPTIND - 1))

load_config

if [ -z "${message+x}" ]; then
	message="`obtain_message | head -c"$(($MAX_MESSAGE_LENGTH * 4))"`"
fi

message_length="`printf -- "%s" "${message}" | wc -m`"
if ! [ "$message_length" -gt 0 ]; then
	error "message is empty."
elif ! [ "$message_length" -le "$MAX_MESSAGE_LENGTH" ]; then
	error "Too long message. A length of message should be <= $MAX_MESSAGE_LENGTH."
fi

params=""

if [ -n "$talk" ]; then
	params="$params --data-urlencode talkIds[]=$talk"
fi

curl --silent \
	--data-urlencode 'message='"$message" \
	--data-urlencode 'typetalkToken='"${TYPETALK_TOKEN}" \
	$params \
	'https://typetalk.com/api/v1/topics/'"${TYPETALK_TOPIC}" |
	format_json