#!/bin/bash

#=================================================
# GENERIC START
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source /usr/share/yunohost/helpers

# Stop script if errors
ynh_abort_if_errors

# Import common fonctions
source ./psql.sh
source ./experimental_helper.sh
source ./_common.sh

#=================================================
# SET ALL CONSTANT
#=================================================

app=$YNH_APP_INSTANCE_NAME
synapse_user="matrix-$app"
synapse_db_name="matrix_$app"
synapse_db_user="matrix_$app"
upstream_version=$(ynh_app_upstream_version)
report_stats="False"

#=================================================
# RETRIEVE ARGUMENTS FROM THE MANIFEST
#=================================================

domain=$YNH_APP_ARG_DOMAIN
is_public=$YNH_APP_ARG_IS_PUBLIC
path_url="/_matrix"
final_path="/opt/yunohost/matrix-$app"

#=================================================
# CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
#=================================================

ynh_webpath_available $domain $path_url || ynh_die "$domain is not available as domain, please use an other domain."
test ! -e "/etc/nginx/conf.d/$domain.d/synapse*.conf" || ynh_die "$domain is not available as domain, please use an other domain."

# Check Final Path availability
test ! -e "$final_path" || ynh_die "This path already contains a folder"

#=================================================
# STORE SETTINGS FROM MANIFEST
#=================================================

# For the domain and the path we can't use the standard keys "domain" and "path" with the standard function ynh_webpath_register because it create automatically a button on the user pannel.
# The idea is to create a custom key (specia_domain and special_path instead of domain and key).
# By this the ssowatconf fonction don't create a button on the pannel.
# This hack solve the issue : https://github.com/YunoHost-Apps/synapse_ynh/issues/14
ynh_app_setting_set $app special_domain $domain
ynh_app_setting_set $app special_path $path_url
ynh_app_setting_set $app final_path $final_path
ynh_app_setting_set $app synapse_version $upstream_version
ynh_app_setting_set $app is_public $is_public
ynh_app_setting_set $app report_stats $report_stats

#=================================================
# STANDARD MODIFICATIONS
#=================================================
# FIND AND OPEN A PORT
#=================================================

# Find a free port
synapse_tls_port=$(ynh_find_port 8448)
port=$(ynh_find_port 8008)
turnserver_tls_port=$(ynh_find_port 5349)
turnserver_alt_tls_port=$(ynh_find_port $((turnserver_tls_port+1)))
cli_port=$(ynh_find_port 5766)

# Open this port
yunohost firewall allow TCP $synapse_tls_port > /dev/null 2>&1
yunohost firewall allow Both $turnserver_tls_port > /dev/null 2>&1
yunohost firewall allow Both $turnserver_alt_tls_port > /dev/null 2>&1

# Store opened ports
ynh_app_setting_set $app synapse_port $port
ynh_app_setting_set $app synapse_tls_port $synapse_tls_port
ynh_app_setting_set $app turnserver_tls_port $turnserver_tls_port
ynh_app_setting_set $app turnserver_alt_tls_port $turnserver_alt_tls_port
ynh_app_setting_set $app cli_port $cli_port

#=================================================
# CREATE A DH FILE
#=================================================

# WARNING : theses command are used in INSTALL, UPGRADE, RESTORE
# For any update do it in all files

# Make dh cert for synapse if doesn't exist
if [[ ! -e /etc/ssl/private/dh2048.pem ]]
then
    openssl dhparam -out /etc/ssl/private/dh2048.pem -outform PEM -2 2048 -dsaparam 2> /dev/null
    chown root:ssl-cert /etc/ssl/private/dh2048.pem
    chmod 640 /etc/ssl/private/dh2048.pem
fi

#=================================================
# INSTALL DEPENDENCIES
#=================================================

# WARNING : theses command are used in INSTALL, UPGRADE, RESTORE
# For any update do it in all files
ynh_install_app_dependencies $dependances

#=================================================
# CREATE DEDICATED USER
#=================================================

ynh_system_user_create $synapse_user /var/lib/matrix-$app
adduser $synapse_user ssl-cert
adduser turnserver ssl-cert

#=================================================
# CREATE A POSTGRESQL DATABASE
#=================================================

synapse_db_pwd=$(ynh_string_random 30)
ynh_app_setting_set $app synapse_db_pwd $synapse_db_pwd

# Create postgresql database
ynh_psql_test_if_first_run
ynh_psql_create_user $synapse_db_user $synapse_db_pwd
ynh_psql_execute_as_root \
"CREATE DATABASE $synapse_db_name ENCODING 'UTF8' LC_COLLATE='C' LC_CTYPE='C' template=template0 OWNER $synapse_db_user;"

#=================================================
# DOWNLOAD, CHECK AND UNPACK SOURCE
#=================================================

# Create empty dir for synapse

# WARNING : theses command are used in INSTALL, UPGRADE
# For any update do it in all files
mkdir -p /var/lib/matrix-$app
mkdir -p /var/log/matrix-$app
mkdir -p /etc/matrix-$app/conf.d
mkdir -p $final_path

# Install synapse in virtualenv

# WARNING : theses command are used in INSTALL, UPGRADE (2 times)
# For any update do it in all files
if [ -n "$(uname -m | grep arm)" ]
then
    ynh_setup_source $final_path/ "armv7_$(lsb_release --codename --short)"
else
    # Install virtualenv if it don't exist
    test -e $final_path/bin/python3 || python3 -m venv $final_path

    # Install synapse in virtualenv
    cp ../conf/virtualenv_activate $final_path/bin/activate
    ynh_replace_string __FINAL_PATH__ $final_path $final_path/bin/activate

    # We set all necessary environement variable to create a python virtualenvironnement.
    source $final_path/bin/activate
    pip3 install --upgrade pip
    pip3 install --upgrade setuptools wheel
    pip3 install --upgrade cffi ndg-httpsclient psycopg2 lxml
    pip3 install --upgrade matrix-synapse==$upstream_version matrix-synapse-ldap3

    # This function was defined when we called "source $final_path/bin/activate". With this function we undo what "$final_path/bin/activate" does
    deactivate
fi

#=================================================
# CREATE SYNAPSE CONFIG
#=================================================

# Go in virtualenvironnement
PS1=${PS1:-}
source $final_path/bin/activate

# Generate config
python -m synapse.app.homeserver --keys-directory /etc/matrix-$app/ --generate-config --generate-keys --server-name $domain --report-stats=no -c homeserver.yml

# This function was defined when we called "source $final_path/bin/activate". With this function we undo what "$final_path/bin/activate" does
deactivate

# Get random values from config
registration_shared_secret=$(egrep "^registration_shared_secret" homeserver.yml | cut -d'"' -f2)
form_secret=$(egrep "^form_secret" homeserver.yml | cut -d'"' -f2)

# store in yunohost settings
ynh_app_setting_set $app registration_shared_secret "$registration_shared_secret"
ynh_app_setting_set $app form_secret "$form_secret"

#=================================================
# SETUP SYSTEMD
#=================================================

# Create systemd service for synapse and turnserver
cp ../conf/default_matrix-synapse /etc/default/matrix-$app
ynh_add_systemd_config matrix-$app matrix-synapse.service

cp ../conf/default_coturn /etc/default/coturn-$app
ynh_add_systemd_config coturn-$app coturn-synapse.service

#=================================================
# NGINX CONFIGURATION
#=================================================

ynh_add_nginx_config

#=================================================
# SET SYNAPSE CONFIG
#=================================================

# Find password for turnserver and database
turnserver_pwd=$(ynh_string_random 30)
ynh_app_setting_set $app turnserver_pwd $turnserver_pwd

# Configure Synapse

# WARNING : theses command are used in INSTALL, UPGRADE (2 times)
# For any update do it in all files

homeserver_config_path="/etc/matrix-$app/homeserver.yaml"

cp ../conf/homeserver.yaml "$homeserver_config_path"
cp ../conf/log.yaml /etc/matrix-$app/log.yaml

ynh_replace_string __APP__ $app "$homeserver_config_path"
ynh_replace_string __DOMAIN__ $domain "$homeserver_config_path"
ynh_replace_string __SYNAPSE_DB_USER__ $synapse_db_user "$homeserver_config_path"
ynh_replace_string __SYNAPSE_DB_PWD__ $synapse_db_pwd "$homeserver_config_path"
ynh_replace_string __PORT__ $port "$homeserver_config_path"
ynh_replace_string __TLS_PORT__ $synapse_tls_port "$homeserver_config_path"
ynh_replace_string __TURNSERVER_TLS_PORT__ $turnserver_tls_port "$homeserver_config_path"
ynh_replace_special_string __TURNPWD__ $turnserver_pwd "$homeserver_config_path"
ynh_replace_special_string __REGISTRATION_SECRET__ "$registration_shared_secret" "$homeserver_config_path"
ynh_replace_string __FORM_SECRET__ "$form_secret" "$homeserver_config_path"
ynh_replace_string __REPORT_STATS__ "$report_stats" "$homeserver_config_path"

ynh_replace_string __APP__ $app "/etc/matrix-$app/log.yaml"

if [ "$is_public" = "0" ]
then
    ynh_replace_string __ALLOWED_ACCESS__ False "$homeserver_config_path"
else
    ynh_replace_string __ALLOWED_ACCESS__ True "$homeserver_config_path"
fi

ynh_store_file_checksum "$homeserver_config_path"
ynh_store_file_checksum "/etc/matrix-$app/log.yaml"

#=================================================
# SET COTURN CONFIG
#=================================================

# WARNING : theses command are used in INSTALL, UPGRADE
# For any update do it in all files

coturn_config_path="/etc/matrix-$app/coturn.conf"

cp ../conf/turnserver.conf "$coturn_config_path"

ynh_replace_string __APP__ $app "$coturn_config_path"
ynh_replace_string __TURNPWD__ $turnserver_pwd "$coturn_config_path"
ynh_replace_string __DOMAIN__ $domain "$coturn_config_path"
ynh_replace_string __TLS_PORT__ $turnserver_tls_port "$coturn_config_path"
ynh_replace_string __TLS_ALT_PORT__ $turnserver_alt_tls_port "$coturn_config_path"
ynh_replace_string __CLI_PORT__ $cli_port "$coturn_config_path"

# Get public IP and set as external IP for coturn
# note : '|| true' is used to ignore the errors if we can't get the public ipv4 or ipv6
public_ip4="$(curl ip.yunohost.org)" || true
public_ip6="$(curl ipv6.yunohost.org)" || true

if [[ -n "$public_ip4" ]] && ynh_validate_ip4 "$public_ip4"
then
    ynh_replace_string '__IPV4__' "$public_ip4" "$coturn_config_path"
else
    ynh_replace_string '__IPV4__,' "" "$coturn_config_path"
fi

if [[ -n "$public_ip6" ]] && ynh_validate_ip6 "$public_ip6"
then
    ynh_replace_string '__IPV6__' "$public_ip6" "$coturn_config_path"
else
    ynh_replace_string ',__IPV6__' "" "$coturn_config_path"
fi

ynh_store_file_checksum "$coturn_config_path"

#=================================================
# SETUP LOGROTATE
#=================================================

ynh_use_logrotate /var/log/matrix-$app

#=================================================
# ADD SCRIPT FOR COTURN CRON
#=================================================

# WARNING : theses command are used in INSTALL, UPGRADE
# For any update do it in all files

cp ../sources/Coturn_config_rotate.sh $final_path/
ynh_replace_string __APP__ $app "$final_path/Coturn_config_rotate.sh"

#=================================================
# GENERIC FINALIZATION
#=================================================
# SETUP SSOWAT
#=================================================

# Open access to server without a button the home
# The script "add_sso_conf.py" will just add en entry for the path "/_matrix" in the sso conf.json.persistent file in the cathegory "skipped_urls".
cp ../conf/add_sso_conf.py $final_path
cp ../conf/remove_sso_conf.py $final_path
python3 $final_path/add_sso_conf.py || ynh_die "Your file /etc/ssowat/conf.json.persistent don't respect the json synaxe. Please fix the synaxe to install this app. For more information see here : https://github.com/YunoHost-Apps/synapse_ynh/issues/32"

#=================================================
# SECURE FILES AND DIRECTORIES
#=================================================

# WARNING : theses command are used in INSTALL, UPGRADE, RESTORE
# For any update do it in all files
chown $synapse_user:root -R $final_path
chmod 770 $final_path/Coturn_config_rotate.sh
chown $synapse_user:root -R /var/lib/matrix-$app
chown $synapse_user:root -R /var/log/matrix-$app
chown $synapse_user:root -R /etc/matrix-$app
chmod u=rwX,g=rX,o= -R /etc/matrix-$app
chmod 600 /etc/matrix-$app/$domain.signing.key
setfacl -R -m user:turnserver:rX  /etc/matrix-$app
setfacl -R -m user:turnserver:rwX  /var/log/matrix-$app

#=================================================
# ADVERTISE SERVICE IN ADMIN PANEL
#=================================================

yunohost service add matrix-$app -l "/var/log/matrix-$app/homeserver.log"
yunohost service add coturn-$app

#=================================================
# RELOAD SERVICES
#=================================================

systemctl restart coturn-$app.service
ynh_check_starting "Synapse now listening on TCP port $synapse_tls_port" "/var/log/matrix-$app/homeserver.log" 300 "matrix-$app"

#=================================================
# SETUP FAIL2BAN
#=================================================

# WARNING : theses command are used in INSTALL, UPGRADE
# For any update do it in all files

ynh_add_fail2ban_config -t

#=================================================
# SEND A README FOR THE ADMIN
#=================================================

# WARNING : theses command are used in INSTALL, RESTORE
# For any update do it in all files

message="To federate this app you need to add this line in your DNS configuration:

_matrix._tcp.$domain. 3600    IN      SRV     10 0 $synapse_tls_port $domain.

You also need to open the TCP port $synapse_tls_port on your ISP box if it's not automatically done.

Your synapse server also implements a turnserver (for VoIP), to have this fully functional please read the 'Turnserver' section in the README available here: https://github.com/YunoHost-Apps/synapse_ynh .

If you're facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/synapse_ynh

You also need a valid TLS certificate for the domain used by synapse. To do that you can refer to the documentation here : https://yunohost.org/#/certificate_en"

ynh_send_readme_to_admin "$message"