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+ GNU GENERAL PUBLIC LICENSE

+ Version 3, 29 June 2007

+

+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>

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+an absolute waiver of all civil liability in connection with the

+Program, unless a warranty or assumption of liability accompanies a

+copy of the Program in return for a fee.

+

+ END OF TERMS AND CONDITIONS

+

+ How to Apply These Terms to Your New Programs

+

+ If you develop a new program, and you want it to be of the greatest

+possible use to the public, the best way to achieve this is to make it

+free software which everyone can redistribute and change under these terms.

+

+ To do so, attach the following notices to the program. It is safest

+to attach them to the start of each source file to most effectively

+state the exclusion of warranty; and each file should have at least

+the "copyright" line and a pointer to where the full notice is found.

+

+ <one line to give the program's name and a brief idea of what it does.>

+ Copyright (C) <year> <name of author>

+

+ This program is free software: you can redistribute it and/or modify

+ it under the terms of the GNU General Public License as published by

+ the Free Software Foundation, either version 3 of the License, or

+ (at your option) any later version.

+

+ This program is distributed in the hope that it will be useful,

+ but WITHOUT ANY WARRANTY; without even the implied warranty of

+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

+ GNU General Public License for more details.

+

+ You should have received a copy of the GNU General Public License

+ along with this program. If not, see <http://www.gnu.org/licenses/>.

+

+Also add information on how to contact you by electronic and paper mail.

+

+ If the program does terminal interaction, make it output a short

+notice like this when it starts in an interactive mode:

+

+ <program> Copyright (C) <year> <name of author>

+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

+ This is free software, and you are welcome to redistribute it

+ under certain conditions; type `show c' for details.

+

+The hypothetical commands `show w' and `show c' should show the appropriate

+parts of the General Public License. Of course, your program's commands

+might be different; for a GUI interface, you would use an "about box".

+

+ You should also get your employer (if you work as a programmer) or school,

+if any, to sign a "copyright disclaimer" for the program, if necessary.

+For more information on this, and how to apply and follow the GNU GPL, see

+<http://www.gnu.org/licenses/>.

+

+ The GNU General Public License does not permit incorporating your program

+into proprietary programs. If your program is a subroutine library, you

+may consider it more useful to permit linking proprietary applications with

+the library. If this is what you want to do, use the GNU Lesser General

+Public License instead of this License. But first, please read

+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

+########################################

+# core settings

+

+# set to non-zero to enable verbose output to stderr

+IRCBOT_VERBOSE=1

+

+# IRC server address

+IRCBOT_HOST=irc.example.net

+

+# IRC server port

+IRCBOT_PORT=6667

+

+# bot nick

+IRCBOT_NICK=sedbot

+

+# bot login name

+IRCBOT_LOGIN=$IRCBOT_NICK

+

+# bot realname

+IRCBOT_REALNAME=$IRCBOT_NICK

+

+# list of modules to load (array, note the parentheses)

+IRCBOT_MODULES=(ping ctcpversion ibip channels log sed)

+

+# truncate lines to this many bytes

+IRCBOT_MAX_LINE_LENGTH=400

+

+# sleep after making connection to the IRC server

+IRCBOT_SLEEP_CONNECT=0

+

+# sleep before reconnecting on disconnect

+IRCBOT_SLEEP_RECONNECT=10

+

+# seconds before reconnect if no line is read (set to more than server ping interval)

+IRCBOT_READ_TIMEOUT=300

+

+

+########################################

+# modules/channels

+

+# path to the list of stored channels

+CHANNELS_LIST=./ircbot.channels

+

+

+########################################

+# modules/ctcpversion

+

+# custom response to CTCP VERSION requests instead of bash version; optional

+CTCP_VERSION="$(sed --version 2>&1 | trimrn)" # some seds don't have --version, have to fix?

+

+

+########################################

+# modules/ibip

+

+# seconds between IBIP responses; optional

+IBIP_TIMEOUT=5

+

+# custom comment on IBIP response; optional

+IBIP_COMMENT="See https://github.com/clsr/sedbot and pretend it's better"

+

+# set to non-zero to respond to IBIP using NOTICE instead of PRIVMSG; optional

+IBIP_NOTICE=0

+

+

+########################################

+# modules/log

+

+# log file for IRC protocol traffic; optional

+LOG_IRC=./ircbot.log

+

+# log file for stderr messages; optional

+LOG_ERR=./ircbot.err

+

+# set to non-zero to show IRC output on stdout; optional

+LOG_SHOW_IRC=1

+

+

+########################################

+# modules/sed

+

+# path to the timeout script; optional, used to prevent DoS regexps

+# see https://github.com/pshved/timeout

+SED_TIMEOUT_BIN=./timeout

+

+# amount of memory in kilobytes that a sed process may use when using the timeout script

+SED_TIMEOUT_MEM=16386

+#!/bin/bash

+

+

+IRCBOT_VERSION=0.1.0

+

+

+# Modular IRC bot framework in bash

+#

+# Modules should be ./modules/*.bash

+#

+# Run as `bash ircbot.bash path/to/config.bash`

+

+

+# Exposed variables:

+#

+# IRCBOT_MODULE

+# the name of the current module

+#

+# IRCBOT_VERSION

+# the version of the bot

+#

+# See config.bash for other exposed variables

+

+

+# Exposed functions:

+#

+# verbose $format $args...

+# log a message prefixed with the current module name to stderr (and error

+# log if using modules/log); same arguments as printf

+#

+# parse_source_nick $source

+# prints nick from source; returns 1 when no nick

+#

+# parse_source_user $source

+# prints username from source; returns 1 when no username

+#

+# parse_source_host $source

+# prints hostname from source; returns 1 when no hostname

+#

+# parse_targeted_nick $msg

+# prints targeted nick (message prefixed with "nick: " or "nick, ") from a PRIVMSG message

+#

+# parse_targeted_msg $msg

+# prints message part of a targeted message (all but the "nick: " or "nick, " prefix) from a PRIVMSG message

+#

+# parse_ctcp_command $msg

+# prints the CTCP command from a PRIVMSG message; returns 1 if not valid CTCP message

+#

+# parse_ctcp_message $msg

+# prints the CTCP message from a PRIVMSG message; returns 1 if not valid CTCP message

+#

+# trimrn

+# removes all linebreaks and carriage returns from stdin

+#

+# indexof $haystack $needle

+# prints the index of $needle in $haystack or -1 if not found

+#

+# sendmsg $command $args...

+# sends an IRC command; only the last argument may contain spaces

+#

+

+

+set -euo pipefail

+

+IRCBOT_MODULE=ircbot

+

+_events=(connect disconnect readmsg sendmsg privmsg dm ctcp self_join self_kick self_part self_invite)

+

+verbose() {

+ if [ -n "$IRCBOT_VERBOSE" ] && [ "$IRCBOT_VERBOSE" -ne 0 ]; then

+ printf "[%s] $1\n" "$IRCBOT_MODULE" "${@:2}" >&2

+ fi

+}

+

+connect() {

+ if ! exec 3<>"/dev/tcp/$IRCBOT_HOST/$IRCBOT_PORT"; then

+ return $?

+ fi

+

+ if ! sendmsg NICK "$IRCBOT_NICK"; then

+ return $?

+ fi

+ if ! sendmsg USER "$IRCBOT_LOGIN 8 *" "$IRCBOT_REALNAME"; then

+ return $?

+ fi

+

+ return 0

+}

+

+

+#nick!login@host

+# 1-nick, 2-login, 3-host

+_source_regex='^\([^!]\+\)!\([^@]\+\)@\(.*\)$'

+

+parse_source_nick() { # args: $1 - source

+ sed "s/$_source_regex/\\1/" <<< "$1"

+}

+

+parse_source_login() { # args: $1 - source

+ sed "s/$_source_regex/\\2/" <<< "$1"

+}

+

+parse_source_host() { # args: $1 - source

+ sed "s/$_source_regex/\\3/" <<< "$1"

+}

+

+

+_ctcp_regex='^\x01\([A-Za-z]\+\) \?\([^\x01]*\)\x01$'

+

+parse_ctcp_command() { # args: $1 - PRIVMSG message

+ local ctcp

+ ctcp="$(sed "s/$_ctcp_regex/\\U\\1/" <<< "$1")"

+ if [[ $ctcp != "$1" ]]; then

+ printf "%s\n" "$ctcp"

+ return 0

+ fi

+ return 1

+}

+

+parse_ctcp_message() { # args: $1 - PRIVMSG message

+ local msg

+ msg="$(sed "s/$_ctcp_regex/\\2/" <<< "$1")"

+ if [[ $msg != "$1" ]]; then

+ printf "%s\n" "$ctcp"

+ return 0

+ fi

+ return 1

+}

+

+

+_targeted_regex='^\([^ /|,!:]\+\)[:,] \(.\+\)'

+

+parse_targeted_nick() { # args: $1 - PRIVMSG message

+ local target

+ target="$(sed "s/$_targeted_regex/\\1/" <<< "$1")"

+ if [[ -n $target && $target != "$1" ]]; then

+ sed : <<< "$target"

+ return 0

+ fi

+ return 1

+}

+

+parse_targeted_msg() { # args: $1 - PRIVMSG message

+ local target

+ target="$(sed "s/$_targeted_regex/\\2/" <<< "$1")"

+ if [[ -n $target && $target != "$1" ]]; then

+ sed : <<< "$target"

+ return 0

+ fi

+ return 1

+}

+

+

+trimrn() { # no args, put input to stdin

+ #sed -e 's/\r//g' -e 's/\n//g' -e 1q

+ tr -d '\r\n'

+}

+

+indexof() { # args: $1 - haystack, $2 - needle

+ local str search i

+ str="$1"

+ search="$2"

+

+ i=0;

+ while :; do

+ if ((i >= ${#str})); then

+ i=-1

+ break

+ fi

+ if [[ ${str:$i:1} == "$search" ]]; then

+ break

+ fi

+ ((i++))

+ done

+

+ echo "$i"

+}

+

+

+sendmsg() { # args: $1 - command, $2... - args (any number)

+ local msg oldifs cmd args

+ msg="$(sed 's/.*/\U&/' <<< "$1")"

+ cmd="$msg"

+ shift

+ args=("$@")

+ if [[ $# -gt 1 ]]; then

+ oldifs="$IFS"

+ IFS=' '

+ msg="$msg ${*:1:(($#-1))}"

+ IFS="$oldifs"

+ shift $(($#-1))

+ fi

+ if [[ $# -gt 0 ]]; then

+ msg="$msg :$1"

+ fi

+ msg="$(trimrn <<< "$msg" | sed 's/^\(.\{,'"$IRCBOT_MAX_LINE_LENGTH"'\}\).*/\1/')"

+ if ! _trigger sendmsg "$msg" "$cmd" "${args[@]}"; then

+ return $?

+ fi

+ printf "%s\r\n" "$msg" >&3

+ return $?

+}

+

+_readmsg() {

+ local line

+ IFS= read -r -u 3 -t "${IRCBOT_READ_TIMEOUT:-300}" line

+ success=$?

+ printf "%s\n" "$line" | trimrn

+ return $success

+}

+

+

+_readloop() {

+ local orig msg src cmd args pos

+

+ while :; do

+ if ! msg="$(_readmsg)"; then

+ verbose 'disconnected from server'

+ return 1

+ fi

+

+ orig="$msg"

+

+ # has source?

+ src=

+ if [[ ${msg:0:1} == : ]]; then

+ pos="$(indexof "$msg" ' ')"

+ if [[ $pos -lt 0 ]]; then

+ return 1

+ fi

+ src="${msg:1:$pos}"

+ ((++pos))

+ msg="${msg:$pos}"

+ fi

+

+ # grab the command

+ pos="$(indexof "$msg" ' ')"

+ if [[ $pos -lt 0 ]]; then

+ cmd="$msg"

+ msg=

+ else

+ cmd="${msg:0:$pos}"

+ ((++pos))

+ msg="${msg:$pos}"

+ fi

+

+ # parse args, ending when no more spaces or on last arg starting with :

+ args=()

+ while :; do

+ if [[ ${msg:0:1} = : ]]; then

+ args+=("${msg:1}")

+ break

+ fi

+ pos="$(indexof "$msg" ' ')"

+ if [[ $pos -lt 0 ]]; then

+ args+=("$msg")

+ break

+ fi

+ args+=("${msg:0:$pos}")

+ ((++pos))

+ msg="${msg:$pos}"

+ done

+

+ #printf "raw: '%s'\n" "$orig"

+ #printf "source: '%s'\n" "$src"

+ #printf "nick: '%s'\n" "$(parse_source_nick "$src")"

+ #printf "command: '%s'\n" "$cmd"

+ #printf "args:\n"

+ #printf " %s\n" "${args[@]}"

+ #echo

+

+

+ _handle_msg "$orig" "$src" "$cmd" "${args[@]}"

+ done

+}

+

+_handle_msg() { # args: $1 - raw message, $2 - source, $3 - command, $4... - args

+ local orig src cmd args nick where who why msg ctcp

+ orig="$1"

+ src="$2"

+ cmd="$3"

+ args=("${@:4}")

+

+

+ _trigger readmsg "$orig" "$src" "$cmd" "${args[@]}"

+

+

+ # XXX sometimes, you have to respond to a PING before registering

+ if [[ $_pre_register != 0 && $cmd != NOTICE && $cmd != PING ]]; then

+ _pre_register=0

+ _trigger connect

+ fi

+

+

+

+ case "$cmd" in

+ JOIN)

+ nick="$(parse_source_nick "$src")"

+ where="${args[0]:-}"

+ if [[ $nick == "$IRCBOT_NICK" ]]; then

+ _trigger self_join "$where"

+ fi

+ ;;

+

+ KICK)

+ nick="$(parse_source_nick "$src")"

+ who="${args[0]}"

+ where="${args[1]}"

+ why="${args[2]:-}"

+ if [[ $who == "$IRCBOT_NICK" ]]; then

+ _trigger self_kick "$src" "$where" "$why"

+ fi

+ ;;

+

+ PART)

+ nick="$(parse_source_nick "$src")"

+ where="${args[0]}"

+ why="${args[1]:-}"

+ if [[ $nick == "$IRCBOT_NICK" ]]; then

+ _trigger self_part "$where" "$why"

+ fi

+ ;;

+

+ INVITE)

+ nick="$(parse_source_nick "$src")"

+ who="${args[0]}"

+ where="${args[1]}"

+ if [[ $who == "$IRCBOT_NICK" ]]; then

+ _trigger self_invite "$src" "$where"

+ fi

+ ;;

+

+ 433)

+ verbose 'nick %s is already taken' "$IRCBOT_NICK"

+ #exit 1

+ return # as if disconnected

+ ;;

+

+ PRIVMSG)

+ where="${args[0]}"

+ msg="${args[1]}"

+

+ _trigger privmsg "$src" "$where" "$msg"

+

+ if [[ $where == "$IRCBOT_NICK" ]]; then

+ _trigger dm "$src" "$msg"

+

+ if ctcp="$(parse_ctcp_command "$msg")"; then

+ _trigger ctcp "$src" "$ctcp" "$(parse_ctcp_message "$msg")"

+ fi

+ fi

+ ;;

+ esac

+

+}

+

+_trigger() { # args: $1 - event, $2... - event args

+ local mod ev fn ret

+ ev="$1"

+ shift

+ ret=0

+ for mod in "${IRCBOT_MODULES[@]}"; do

+ fn="_module_${mod}_on_${ev}"

+ if declare -F "$fn" >/dev/null; then

+ IRCBOT_MODULE="$mod"

+ if ! "$fn" "$@"; then

+ ret=$?

+ fi

+ IRCBOT_MODULE=ircbot

+ fi

+ done

+ return "$ret"

+}

+

+_load_modules() {

+ local mod ev

+ for mod in "${IRCBOT_MODULES[@]}"; do

+ IRCBOT_MODULE="$mod"

+ source "modules/$mod.bash"

+ IRCBOT_MODULE=ircbot

+ verbose "sourced module %s" "$mod"

+ for ev in "${_events[@]}"; do

+ if declare -F "on_${ev}" >/dev/null; then

+ # this is kinda evil

+ eval "$(echo "_module_${mod}_on_${ev}()"; declare -f "on_${ev}" | tail -n +2)"

+ unset -f "on_${ev}"

+ verbose "module %s installed handler %s" "$mod" "$ev"

+ fi

+ done

+ done

+}

+

+_main() { # args: $1 - config file

+ source "$1"

+ _load_modules

+ while :; do

+ if connect; then

+ #_trigger connect

+ verbose 'connected'

+ sleep "${IRCBOT_SLEEP_CONNECT:-0}"

+ _pre_register=1

+ _readloop

+ fi

+ _trigger disconnect

+ verbose 'reconnecting in %d seconds...' "${IRCBOT_SLEEP_RECONNECT:-10}"

+ sleep "${IRCBOT_SLEEP_RECONNECT:-10}"

+ done

+}

+

+_main "$@"

+# modules/channels.bash

+#

+# Provides persistant storage of channels the bot is in.

+#

+# Settings:

+# CHANNELS_LIST: file to store channel list in

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+channels_list=()

+

+

+# joins channels in the list after connecting

+on_connect() { # no args

+ local ch

+ channels_load

+ for ch in "${channels_list[@]}"; do

+ sendmsg JOIN "$ch"

+ done

+}

+

+# adds a joined channel to the list

+on_self_join() { # args: $1 - channel

+ channels_add "$1"

+}

+

+# removes a channel from the list

+on_self_kick() { # args: $1 - source, $2 - channel, $3 - kick message

+ channels_remove "$2"

+}

+

+# removes a channel from the list

+on_self_part() { # args: $1 - channel, $2 - part message

+ channels_remove "$1"

+}

+

+

+channels_load() { # no args

+ local line

+ channels_list=()

+ if [ -f "$CHANNELS_LIST" ]; then

+ while IFS= read -r line || [ -n "$line" ]; do

+ verbose 'loaded channel %s' "$line"

+ channels_list+=("$line")

+ done < "$CHANNELS_LIST"

+ fi

+}

+

+channels_add() { # args: $1 - channel

+ channels_load

+ verbose 'adding channel %s' "$1"

+ channels_list+=("$1")

+ channels_dump

+}

+

+channels_remove() { # args: $1 - channel

+ channels_load

+ verbose 'removing channel %s' "$1"

+ printf "%s\n" "${channels_list[@]}" | grep -xvF "$1" > "$CHANNELS_LIST" # XXX: ugly hack

+ channels_load

+}

+

+channels_dump() {

+ verbose 'dumping channel list: %s' "${channels_list[*]}"

+ printf "%s\n" "${channels_list[@]}" | sort | uniq > "$CHANNELS_LIST"

+}

+# modules/ctcpversion.bash

+#

+# Responds to CTCP VERSION direct message requests.

+#

+# Settings:

+# CTCP_VERSION: response to the CTCP VERSION request; optional, defaults to bash version

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+# respond to CTCP VERSION requests

+on_ctcp() { # args: $1 - source, $2 - CTCP command, $3 - CTCP argument

+ local version interpreter

+ if [[ $2 == VERSION ]]; then

+ if [[ -n ${CTCP_VERSION:-} ]]; then

+ version="$CTCP_VERSION"

+ else

+ interpreter=sh # I should make it actually find out which interpreter it's running if it's not bash or zsh; also, fails on dash as it lacks --version

+ if [ "$BASH_VERSION" ]; then

+ interpreter=bash

+ elif [ "$ZSH_VERSION" ]; then

+ interpreter=zsh

+ fi

+ version="$("$interpreter" --version 2>&1 | sed 1q)"

+ fi

+ sendmsg NOTICE "$(parse_source_nick "$1")" "$(sed 's/^.*$/\x01&\x01/' <<< "VERSION $version")"

+ fi

+}

+# modules/example.bash

+#

+# Provides example handlers for an ircbot.bash module.

+# This file is sourced by ircbot.bash when the module is loaded.

+# Any handlers may be omitted in modules if they're not used.

+# If an event matches multiple handlers, they're all called (e.g. on_readmsg is

+# always called alongside on_privmsg).

+#

+# Global variables:

+#

+# IRCBOT_HOST: IRC server address

+# IRCBOT_PORT: IRC server port

+# IRCBOT_NICK: bot nick

+# IRCBOT_LOGIN: bot login name

+# IRCBOT_REALNAME: bot realname

+# IRCBOT_MODULE: current module the bot is running

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+# on_connect is called when the bot connects (or reconnects) to the server

+on_connect() { # no args

+}

+

+# on_disconnect is called when the bot disconnects from the server

+on_disconnect() { # no args

+}

+

+# on_readmsg is called whenever a message is read from the IRC server

+on_readmsg() { # args: $1 - raw message, $2 - source, $3 - command, $4... - args

+}

+

+# on_sendmsg is called whenever sendmsg is used to send IRC messages

+# If it returns non-zero, the sendmsg itself is aborted.

+# Be careful not to create infinite sendmsg/on_sendmsg loops.

+on_sendmsg() { # args: $1 - raw message, $2 - command, $3... - args

+}

+

+# on_privmsg is called whenever a PRIVMSG is received

+on_privmsg() { # args: $1 - source, $2 - channel/target, $3 - message

+}

+

+# on_dm is called whenever a PRIVMSG direct (not channel) message is received

+on_dm() { # args: $1 - source, $2 - message

+}

+

+# on_ctcp is called whenever a CTCP PRIVMSG direct (not channel) message is received

+on_ctcp() { # args: $1 - source, $2 - CTCP command, $3 - CTCP argument

+}

+

+# on_self_join is called whenever the bot successfully joins a channel

+on_self_join() { # args: $1 - channel

+}

+

+# on_self_kick is called whnever the bot is kicked from a channel

+on_self_kick() { # args: $1 - source, $2 - channel, $3 - kick message

+}

+

+# on_self_part is called whenever the bot parts a channel

+on_self_part() { # args: $1 - channel, $2 - part message

+}

+

+# on_self_invite is called whenever the bot is invited into a channel

+on_self_invite() { # args: $1 - source, $2 - channel

+}

+# modules/ibip.bash

+#

+# Responds to ``.bots''

+#

+# Settings:

+# IBIP_TIMEOUT: seconds that must pass between IBIP responses; optional

+# IBIP_COMMENT: the comment at the end of the IBIP message; optional

+# IBIP_NOTICE: set to 1 to respond with NOTICE instead of PRIVMSG; optional

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+ibip_last=0

+

+if [[ -z ${IBIP_COMMENT:-} ]]; then

+ IBIP_COMMENT='See https://git.clsr.net/mbibot'

+fi

+

+# on_privmsg is called whenever a PRIVMSG is received

+on_privmsg() { # args: $1 - source, $2 - channel/target, $3 - message

+ local ts where msgtype

+ where="$2"

+ if [[ $where == "$IRCBOT_NICK" ]]; then

+ where="$(parse_source_nick "$1")"

+ fi

+ msgtype=PRIVMSG

+ if [[ ${IBIP_NOTICE:-0} -ne 0 ]]; then

+ msgtype=NOTICE

+ fi

+ if [[ $3 == ".bots" ]]; then

+ ts="$(printf '%(%s)T' -1)"

+ if [[ -z ${IBIP_TIMEOUT:-} ]] || ((ts - ibip_last > IBIP_TIMEOUT)); then

+ ibip_last="$ts"

+ sendmsg "$msgtype" "$where" "Reporting in! [bash] $IBIP_COMMENT"

+ fi

+ fi

+}

+# modules/invitejoin.bash

+#

+# Joins channels when invited.

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+# joins the channel the bot was invited to

+on_self_invite() { # args: $1 - source, $2 - channel

+ sendmsg JOIN "$2"

+}

+# modules/log.bash

+#

+# Logs IRC messages and bot debug/error output.

+#

+# Settings:

+# LOG_IRC: log file for IRC protocol traffic

+# LOG_ERR: log file for stderr messages

+# LOG_SHOW_IRC: set to non-zero to show IRC output on stdout

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+if [[ -n ${LOG_IRC:-} ]]; then

+ if [[ ${LOG_SHOW_IRC:-0} -ne 0 ]]; then

+ exec 14> >(tee -a -- "$LOG_IRC")

+ else

+ exec 14>>"$LOG_IRC"

+ fi

+elif [[ ${LOG_SHOW_IRC:-0} -ne 0 ]]; then

+ exec 14>&1

+fi

+

+if [[ -n ${LOG_ERR:-} ]]; then

+ exec 2> >(tee -a -- "$LOG_ERR" >&2)

+fi

+

+

+# log received messages

+on_readmsg() { # args: $1 - raw message, $2 - source, $3 - command, $4... - args

+ printf "%s <<< %s\n" "$(log_timestamp)" "$1" >&14

+}

+

+# log sent messages

+on_sendmsg() { # args: $1 - raw message, $2 - command, $3... - args

+ printf "%s >>> %s\n" "$(log_timestamp)" "$1" >&14

+}

+

+log_timestamp() {

+ TZ=UTC date -u +%s.%N

+}

+# modules/ping.bash

+#

+# Responds to IRC PINGs.

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+

+# respond to PINGs

+on_readmsg() { # args: $1 - raw message, $2 - source, $3 - command, $4... - args

+ if [[ $3 == PING ]]; then

+ sendmsg PONG "${@:4}"

+ fi

+}

+# modules/sed.bash

+#

+# Provides sedbot.

+#

+# Settings:

+# SED_TIMEOUT_BIN: path to the timeout script¹; optional to prevent regex DoS

+# SED_TIMEOUT_MEM: maximum amount of memory (in kilobytes) a sed process may use

+#

+# ¹: https://github.com/pshved/timeout

+

+

+if [ -z "$IRCBOT_MODULE" ]; then

+ printf "error: %s is a module for ircbot.bash and should not be run separately\n" "$0"

+ exit 1

+fi

+

+declare -g -A sed_messages

+

+# seds a previous message if instucted to

+on_privmsg() { # args: $1 - source, $2 - channel/target, $3 - message

+ local where nick msg

+ local targetednick origmsg origkey

+ local key target fromnick regexed ctcp

+

+ where="$2"

+ nick="$(parse_source_nick "$1")"

+ msg="$3"

+ if [[ $where == "$IRCBOT_NICK" ]]; then

+ where="$nick"

+ fi

+

+ # targeted means the message was ``<user1> user2: s/foo/bar/'' (targets user2's last message)

+ origmsg="$msg"

+ origkey="$where $nick"

+ if targetednick="$(parse_targeted_nick "$msg")"; then

+ nick="$targetednick"

+ msg="$(parse_targeted_msg "$msg")"

+ fi

+

+

+ key="$where $nick"

+ target="${sed_messages[$key]:-}"

+

+ # handle regexing CTCP ACTIONs properly

+ ctcp="$(parse_ctcp_command "$target")" || true

+ if [[ $ctcp == ACTION ]]; then

+ target="$(parse_ctcp_message "$target")"

+ fromnick="$(printf "\\x02* %s\\x02" "$nick")"

+ else

+ fromnick="<$nick>"

+ fi

+

+ if regexed="$(sed_replace "$msg" "$target")"; then # if a replacement was done, send it

+ sendmsg PRIVMSG "$where" "$fromnick $regexed"

+ else # otherwise, store the triggering message

+ sed_messages[$origkey]="$origmsg"

+ fi

+}

+

+sed_replace() { # args: $1 - sed s expression, $2 - text to regex

+ local msg target

+ local l pos i p del

+ local regexps ok t target

+

+ msg="$1"

+ target="$2"

+

+ del="${msg:1:1}"

+ if [[ -z $del ]] || [[ $(indexof '/|,!:' "$del") -lt 0 ]]; then

+ return 1

+ fi

+

+ # TODO: rewrite so that only one expression is tokenized at once (allows different delimiters)

+

+ # tokenize

+ l=()

+ pos="$(indexof "$msg" "$del")"

+ while ((pos >= 0)); do

+ i=0

+ ((p=pos-i-1))

+ while ((p >= 0)) && [[ ${msg:$p:1} == '\' ]]; do # count \ characters

+ ((i++))

+ ((p=pos-i-1))

+ done

+ if ((i%2 == 0)); then

+ l+=("${msg:0:$pos}")

+ ((p=pos+1))

+ msg="${msg:$p}"

+ pos=0

+ else

+ ((pos++))

+ fi

+ p="$(indexof "${msg:$pos}" "$del")"

+ if ((p >= 0)); then

+ ((pos+=p))

+ else

+ pos=$p

+ fi

+ done

+ l+=("$msg")

+

+ # l is now an array of the expr separated by unescaped delimiters

+

+ i=0

+ regexps=()

+ ok=1

+

+ # s/expr1/repl1/opts1 s/expr2/repl2/opts2 s/expr3/repl3

+ while ((i < ${#l[@]})); do

+ # begins with s

+ if [ "${l[$i]}" != "s" ]; then

+ break

+ fi

+ ((i++))

+

+ # expr

+ if ((i >= ${#l[@]})); then

+ break

+ fi

+ exp="${l[$i]}"

+ ((i++))

+

+ # repl

+ if ((i >= ${#l[@]})); then

+ break

+ fi

+ repl="${l[$i]}"

+ ((i++))

+

+ # opts

+ opts=''

+ if ((i < ${#l[@]})); then

+ opts="${l[$i]}"

+ p=0

+ while ((p < ${#opts})); do

+ c="${opts:$p:1}"

+ if ! [[ $c =~ ^[ig0-9]$ ]]; then # allowed opts are 0-9, i and g

+ ok=0

+ break

+ fi

+ ((p++))

+ done

+ if ! ((ok)); then

+ # multiple regexps per line

+ if [[ "${opts:$p:1}" == ' ' || "${opts:$p:1}" == ';' ]]; then # expression separators are space and ;

+ p1=$p

+ while ((p < ${#opts})); do

+ if [[ "${opts:$p:1}" != ' ' && "${opts:$p:1}" != ';' ]]; then

+ break

+ fi

+ p=$((p+1))

+ done

+ l[$i]="${opts:$p}"

+ opts="${opts:0:$p1}"

+ ok=1

+ else

+ break

+ fi

+ fi

+ fi

+

+ if ((ok)); then

+ regexps+=("s$del$exp$del$repl$del$opts")

+ fi

+ done

+

+

+ if ! ((ok)) || ((${#regexps[@]} == 0)); then

+ return 1

+ fi

+

+ t="$target"

+ for re in "${regexps[@]}"; do

+ if [[ -n ${SED_TIMEOUT_BIN:-} ]]; then

+ target="$("$SED_TIMEOUT_BIN" -m "$SED_TIMEOUT_MEM" sed -e "$re" <<< "$target")"

+ else

+ target="$(sed -e "$re" <<< "$target")"

+ fi

+ done

+ target="$(trimrn <<< "$target")"

+ verbose "sed '%s' <<< '%s' >>> '%s'" "$1" "$2" "$target"

+ if [[ $target != "$t" ]]; then

+ if [[ -n $target ]]; then

+ trimrn <<< "$target"

+ return 0

+ fi

+ fi

+ return 1

+}