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searxng/utils/filtron.sh

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#!/usr/bin/env bash
# -*- coding: utf-8; mode: sh indent-tabs-mode: nil -*-
# SPDX-License-Identifier: AGPL-3.0-or-later
# shellcheck disable=SC2119,SC2001
# shellcheck source=utils/lib.sh
source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
# shellcheck source=utils/brand.env
source "${REPO_ROOT}/utils/brand.env"
source_dot_config
source "${REPO_ROOT}/utils/lxc-searx.env"
in_container && lxc_set_suite_env
# ----------------------------------------------------------------------------
# config
# ----------------------------------------------------------------------------
PUBLIC_URL="${PUBLIC_URL:-http://$(uname -n)/searx}"
PUBLIC_HOST="${PUBLIC_HOST:-$(echo "$PUBLIC_URL" | sed -e 's/[^/]*\/\/\([^@]*@\)\?\([^:/]*\).*/\2/')}"
FILTRON_URL_PATH="${FILTRON_URL_PATH:-$(echo "${PUBLIC_URL}" \
| sed -e 's,^.*://[^/]*\(/.*\),\1,g')}"
[[ "${FILTRON_URL_PATH}" == "${PUBLIC_URL}" ]] && FILTRON_URL_PATH=/
FILTRON_ETC="/etc/filtron"
FILTRON_RULES="$FILTRON_ETC/rules.json"
FILTRON_API="${FILTRON_API:-127.0.0.1:4005}"
FILTRON_LISTEN="${FILTRON_LISTEN:-127.0.0.1:4004}"
FILTRON_TARGET="${FILTRON_TARGET:-127.0.0.1:8888}"
SERVICE_NAME="filtron"
SERVICE_USER="${SERVICE_USER:-${SERVICE_NAME}}"
SERVICE_HOME_BASE="${SERVICE_HOME_BASE:-/usr/local}"
SERVICE_HOME="${SERVICE_HOME_BASE}/${SERVICE_USER}"
SERVICE_SYSTEMD_UNIT="${SYSTEMD_UNITS}/${SERVICE_NAME}.service"
# shellcheck disable=SC2034
SERVICE_GROUP="${SERVICE_USER}"
# shellcheck disable=SC2034
SERVICE_GROUP="${SERVICE_USER}"
GO_ENV="${SERVICE_HOME}/.go_env"
GO_PKG_URL="https://dl.google.com/go/go1.13.5.linux-amd64.tar.gz"
GO_TAR=$(basename "$GO_PKG_URL")
# Apache Settings
APACHE_FILTRON_SITE="searx.conf"
# shellcheck disable=SC2034
CONFIG_FILES=(
"${FILTRON_RULES}"
"${SERVICE_SYSTEMD_UNIT}"
)
# ----------------------------------------------------------------------------
usage() {
# ----------------------------------------------------------------------------
# shellcheck disable=SC1117
cat <<EOF
usage::
$(basename "$0") shell
$(basename "$0") install [all|user|rules]
$(basename "$0") update [filtron]
$(basename "$0") remove [all]
$(basename "$0") activate [service]
$(basename "$0") deactivate [service]
$(basename "$0") inspect [service]
$(basename "$0") option [debug-on|debug-off]
$(basename "$0") apache [install|remove]
shell
start interactive shell from user ${SERVICE_USER}
install / remove
:all: complete setup of filtron service
:user: add/remove service user '$SERVICE_USER' ($SERVICE_HOME)
:rules: reinstall filtron rules $FILTRON_RULES
update filtron
Update filtron installation ($SERVICE_HOME)
activate service
activate and start service daemon (systemd unit)
deactivate service
stop and deactivate service daemon (systemd unit)
inspect service
show service status and log
option
set one of the available options
apache : ${PUBLIC_URL}
:install: apache site with a reverse proxy (ProxyPass)
:remove: apache site ${APACHE_FILTRON_SITE}
filtron rules: ${FILTRON_RULES}
If needed, set PUBLIC_URL of your WEB service in the '${DOT_CONFIG#"$REPO_ROOT/"}' file::
PUBLIC_URL : ${PUBLIC_URL}
PUBLIC_HOST : ${PUBLIC_HOST}
SERVICE_USER : ${SERVICE_USER}
FILTRON_API : ${FILTRON_API}
FILTRON_LISTEN : ${FILTRON_LISTEN}
FILTRON_TARGET : ${FILTRON_TARGET}
EOF
[[ -n ${1} ]] && err_msg "$1"
}
main() {
rst_title "$SERVICE_NAME" part
required_commands \
sudo install git wget curl \
|| exit
local _usage="unknown or missing $1 command $2"
case $1 in
--source-only) ;;
-h|--help) usage; exit 0;;
shell)
sudo_or_exit
interactive_shell "${SERVICE_USER}"
;;
inspect)
case $2 in
service)
sudo_or_exit
inspect_service
;;
*) usage "$_usage"; exit 42;;
esac ;;
install)
sudo_or_exit
case $2 in
all) install_all ;;
user) assert_user ;;
rules)
rst_title "Re-Install filtron rules"
echo
install_template --no-eval "$FILTRON_RULES" root root 644
systemd_restart_service "${SERVICE_NAME}"
;;
*) usage "$_usage"; exit 42;;
esac ;;
update)
sudo_or_exit
case $2 in
filtron) update_filtron ;;
*) usage "$_usage"; exit 42;;
esac ;;
remove)
sudo_or_exit
case $2 in
all) remove_all;;
user) drop_service_account "${SERVICE_USER}" ;;
*) usage "$_usage"; exit 42;;
esac ;;
activate)
sudo_or_exit
case $2 in
service) systemd_activate_service "${SERVICE_NAME}" ;;
*) usage "$_usage"; exit 42;;
esac ;;
deactivate)
sudo_or_exit
case $2 in
service) systemd_deactivate_service "${SERVICE_NAME}" ;;
*) usage "$_usage"; exit 42;;
esac ;;
apache)
sudo_or_exit
case $2 in
install) install_apache_site ;;
remove) remove_apache_site ;;
*) usage "$_usage"; exit 42;;
esac ;;
option)
sudo_or_exit
case $2 in
debug-on) echo; enable_debug ;;
debug-off) echo; disable_debug ;;
*) usage "$_usage"; exit 42;;
esac ;;
doc)
echo
echo ".. generic utils/filtron.sh documentation"
;;
*) usage "unknown or missing command $1"; exit 42;;
esac
}
install_all() {
rst_title "Install $SERVICE_NAME (service)"
assert_user
wait_key
install_go "${GO_PKG_URL}" "${GO_TAR}" "${SERVICE_USER}"
wait_key
install_filtron
wait_key
systemd_install_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
wait_key
echo
if ! service_is_available "http://${FILTRON_LISTEN}" ; then
err_msg "Filtron does not listening on: http://${FILTRON_LISTEN}"
fi
if apache_is_installed; then
info_msg "Apache is installed on this host."
if ask_yn "Do you want to install a reverse proxy (ProxyPass)" Yn; then
install_apache_site
fi
fi
if ask_yn "Do you want to inspect the installation?" Ny; then
inspect_service
fi
}
remove_all() {
rst_title "De-Install $SERVICE_NAME (service)"
rst_para "\
It goes without saying that this script can only be used to remove
installations that were installed with this script."
if ! systemd_remove_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"; then
return 42
fi
drop_service_account "${SERVICE_USER}"
rm -r "$FILTRON_ETC" 2>&1 | prefix_stdout
if service_is_available "${PUBLIC_URL}"; then
MSG="** Don't forget to remove your public site! (${PUBLIC_URL}) **" wait_key 10
fi
}
assert_user() {
rst_title "user $SERVICE_USER" section
echo
tee_stderr 1 <<EOF | bash | prefix_stdout
useradd --shell /bin/bash --system \
--home-dir "$SERVICE_HOME" \
--comment 'Reverse HTTP proxy to filter requests' $SERVICE_USER
mkdir "$SERVICE_HOME"
chown -R "$SERVICE_GROUP:$SERVICE_GROUP" "$SERVICE_HOME"
groups $SERVICE_USER
EOF
SERVICE_HOME="$(sudo -i -u "$SERVICE_USER" echo \$HOME)"
export SERVICE_HOME
echo "export SERVICE_HOME=$SERVICE_HOME"
cat > "$GO_ENV" <<EOF
export GOPATH=\$HOME/go-apps
export PATH=\$PATH:\$HOME/local/go/bin:\$GOPATH/bin
EOF
echo "Environment $GO_ENV has been setup."
tee_stderr <<EOF | sudo -i -u "$SERVICE_USER"
grep -qFs -- 'source $GO_ENV' ~/.profile || echo 'source $GO_ENV' >> ~/.profile
EOF
}
filtron_is_installed() {
[[ -f $SERVICE_HOME/go-apps/bin/filtron ]]
}
_svcpr=" ${_Yellow}|${SERVICE_USER}|${_creset} "
install_filtron() {
rst_title "Install filtron in user's ~/go-apps" section
echo
tee_stderr <<EOF | sudo -i -u "$SERVICE_USER" 2>&1 | prefix_stdout "$_svcpr"
go get -v -u github.com/asciimoo/filtron
EOF
install_template --no-eval "$FILTRON_RULES" root root 644
}
update_filtron() {
rst_title "Update filtron" section
echo
tee_stderr <<EOF | sudo -i -u "$SERVICE_USER" 2>&1 | prefix_stdout "$_svcpr"
go get -v -u github.com/asciimoo/filtron
EOF
}
inspect_service() {
rst_title "service status & log"
cat <<EOF
sourced ${DOT_CONFIG#"$REPO_ROOT/"} :
PUBLIC_URL : ${PUBLIC_URL}
PUBLIC_HOST : ${PUBLIC_HOST}
FILTRON_URL_PATH : ${FILTRON_URL_PATH}
FILTRON_API : ${FILTRON_API}
FILTRON_LISTEN : ${FILTRON_LISTEN}
FILTRON_TARGET : ${FILTRON_TARGET}
EOF
apache_is_installed && info_msg "Apache is installed."
if service_account_is_available "$SERVICE_USER"; then
info_msg "service account $SERVICE_USER available."
else
err_msg "service account $SERVICE_USER not available!"
fi
if go_is_available "$SERVICE_USER"; then
info_msg "~$SERVICE_USER: go is installed"
else
err_msg "~$SERVICE_USER: go is not installed"
fi
if filtron_is_installed; then
info_msg "~$SERVICE_USER: filtron app is installed"
else
err_msg "~$SERVICE_USER: filtron app is not installed!"
fi
if ! service_is_available "http://${FILTRON_API}"; then
err_msg "API not available at: http://${FILTRON_API}"
fi
if ! service_is_available "http://${FILTRON_LISTEN}" ; then
err_msg "Filtron does not listening on: http://${FILTRON_LISTEN}"
fi
if service_is_available "http://${FILTRON_TARGET}" ; then
info_msg "Filtron's target is available at: http://${FILTRON_TARGET}"
fi
if ! service_is_available "${PUBLIC_URL}"; then
warn_msg "Public service at ${PUBLIC_URL} is not available!"
if ! in_container; then
warn_msg "Check if public name is correct and routed or use the public IP from above."
fi
fi
if in_container; then
lxc_suite_info
else
info_msg "public URL --> ${PUBLIC_URL}"
info_msg "internal URL --> http://${FILTRON_LISTEN}"
fi
local _debug_on
if ask_yn "Enable filtron debug mode?"; then
enable_debug
_debug_on=1
fi
echo
systemctl --no-pager -l status "${SERVICE_NAME}"
echo
info_msg "public URL --> ${PUBLIC_URL}"
# shellcheck disable=SC2059
printf "// use ${_BCyan}CTRL-C${_creset} to stop monitoring the log"
read -r -s -n1 -t 5
echo
while true; do
trap break 2
journalctl -f -u "${SERVICE_NAME}"
done
if [[ $_debug_on == 1 ]]; then
disable_debug
fi
return 0
}
enable_debug() {
info_msg "try to enable debug mode ..."
python <<EOF
import sys, json
debug = {
u'name': u'debug request'
, u'filters': []
, u'interval': 0
, u'limit': 0
, u'actions': [{u'name': u'log'}]
}
with open('$FILTRON_RULES') as rules:
j = json.load(rules)
pos = None
for i in range(len(j)):
if j[i].get('name') == 'debug request':
pos = i
break
if pos is not None:
j[pos] = debug
else:
j.append(debug)
with open('$FILTRON_RULES', 'w') as rules:
json.dump(j, rules, indent=2, sort_keys=True)
EOF
systemctl restart "${SERVICE_NAME}.service"
}
disable_debug() {
info_msg "try to disable debug mode ..."
python <<EOF
import sys, json
with open('$FILTRON_RULES') as rules:
j = json.load(rules)
pos = None
for i in range(len(j)):
if j[i].get('name') == 'debug request':
pos = i
break
if pos is not None:
del j[pos]
with open('$FILTRON_RULES', 'w') as rules:
json.dump(j, rules, indent=2, sort_keys=True)
EOF
systemctl restart "${SERVICE_NAME}.service"
}
install_apache_site() {
rst_title "Install Apache site $APACHE_FILTRON_SITE"
rst_para "\
This installs a reverse proxy (ProxyPass) into apache site (${APACHE_FILTRON_SITE})"
! apache_is_installed && err_msg "Apache is not installed."
if ! ask_yn "Do you really want to continue?"; then
return
fi
a2enmod headers
a2enmod proxy
a2enmod proxy_http
echo
apache_install_site --variant=filtron "${APACHE_FILTRON_SITE}"
info_msg "testing public url .."
if ! service_is_available "${PUBLIC_URL}"; then
err_msg "Public service at ${PUBLIC_URL} is not available!"
fi
}
remove_apache_site() {
rst_title "Remove Apache site $APACHE_FILTRON_SITE"
rst_para "\
This removes apache site ${APACHE_FILTRON_SITE}."
! apache_is_installed && err_msg "Apache is not installed."
if ! ask_yn "Do you really want to continue?"; then
return
fi
apache_remove_site "$APACHE_FILTRON_SITE"
}
# ----------------------------------------------------------------------------
main "$@"
# ----------------------------------------------------------------------------
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