#!/bin/bash

#=================================================
# BACKUP
#=================================================

HUMAN_SIZE () {	# Transforme une taille en Ko en une taille lisible pour un humain
	human=$(numfmt --to=iec --from-unit=1K $1)
	echo $human
}

CHECK_SIZE () {	# Vérifie avant chaque backup que l'espace est suffisant
	file_to_analyse=$1
	backup_size=$(du --summarize "$file_to_analyse" | cut -f1)
	free_space=$(df --output=avail "/home/yunohost.backup" | sed 1d)

	if [ $free_space -le $backup_size ]
	then
		ynh_print_err "Espace insuffisant pour sauvegarder $file_to_analyse."
		ynh_print_err "Espace disponible: $(HUMAN_SIZE $free_space)"
		ynh_die "Espace nécessaire: $(HUMAN_SIZE $backup_size)"
	fi
}

#=================================================
# PACKAGE CHECK BYPASSING...
#=================================================

IS_PACKAGE_CHECK () {	# Détermine une exécution en conteneur (Non testé)
	return $(uname -n | grep -c 'pchecker_lxc')
}

#=================================================
# EXPERIMENTAL HELPERS
#=================================================

# Start or restart a service and follow its booting
#
# usage: ynh_check_starting "Line to match" [Log file] [Timeout] [Service name]
#
# | arg: Line to match - The line to find in the log to attest the service have finished to boot.
# | arg: Log file - The log file to watch; specify "systemd" to read systemd journal for specified service
#    /var/log/$app/$app.log will be used if no other log is defined.
# | arg: Timeout - The maximum time to wait before ending the watching. Defaut 300 seconds.
# | arg: Service name

ynh_check_starting () {
	local line_to_match="$1"
	local app_log="${2:-/var/log/$service_name/$service_name.log}"
	local timeout=${3:-300}
	local service_name="${4:-$app}"

	echo "Starting of $service_name" >&2
	systemctl stop $service_name
	local templog="$(mktemp)"
	# Following the starting of the app in its log
	if [ "$app_log" == "systemd" ] ; then
		# Read the systemd journal
		journalctl -u $service_name -f --since=-45 > "$templog" &
	else
		# Read the specified log file
		tail -F -n0 "$app_log" > "$templog" &
	fi
	# Get the PID of the last command
	local pid_tail=$!
	systemctl start $service_name

	local i=0
	for i in `seq 1 $timeout`
	do
		# Read the log until the sentence is found, which means the app finished starting. Or run until the timeout.
		if grep --quiet "$line_to_match" "$templog"
		then
			echo "The service $service_name has correctly started." >&2
			break
		fi
		echo -n "." >&2
		sleep 1
	done
	if [ $i -eq $timeout ]
	then
		echo "The service $service_name didn't fully start before the timeout." >&2
	fi

	echo ""
	ynh_clean_check_starting
}
# Clean temporary process and file used by ynh_check_starting
# (usually used in ynh_clean_setup scripts)
#
# usage: ynh_clean_check_starting

ynh_clean_check_starting () {
	# Stop the execution of tail.
	kill -s 15 $pid_tail 2>&1
	ynh_secure_remove "$templog" 2>&1
}

#=================================================

ynh_print_log () {
  echo "${1}"
}

# Print an info on stdout
#
# usage: ynh_print_info "Text to print"
# | arg: text - The text to print
ynh_print_info () {
  ynh_print_log "[INFO] ${1}"
}

# Print a warning on stderr
#
# usage: ynh_print_warn "Text to print"
# | arg: text - The text to print
ynh_print_warn () {
  ynh_print_log "[WARN] ${1}" >&2
}

# Print a error on stderr
#
# usage: ynh_print_err "Text to print"
# | arg: text - The text to print
ynh_print_err () {
  ynh_print_log "[ERR] ${1}" >&2
}

# Execute a command and print the result as an error
#
# usage: ynh_exec_err command to execute
# usage: ynh_exec_err "command to execute | following command"
# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
#
# | arg: command - command to execute
ynh_exec_err () {
	ynh_print_err "$(eval $@)"
}

# Execute a command and print the result as a warning
#
# usage: ynh_exec_warn command to execute
# usage: ynh_exec_warn "command to execute | following command"
# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
#
# | arg: command - command to execute
ynh_exec_warn () {
	ynh_print_warn "$(eval $@)"
}

# Execute a command and force the result to be printed on stdout
#
# usage: ynh_exec_warn_less command to execute
# usage: ynh_exec_warn_less "command to execute | following command"
# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
#
# | arg: command - command to execute
ynh_exec_warn_less () {
	eval $@ 2>&1
}

# Execute a command and redirect stdout in /dev/null
#
# usage: ynh_exec_quiet command to execute
# usage: ynh_exec_quiet "command to execute | following command"
# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
#
# | arg: command - command to execute
ynh_exec_quiet () {
	eval $@ > /dev/null
}

# Execute a command and redirect stdout and stderr in /dev/null
#
# usage: ynh_exec_fully_quiet command to execute
# usage: ynh_exec_fully_quiet "command to execute | following command"
# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
#
# | arg: command - command to execute
ynh_exec_fully_quiet () {
	eval $@ > /dev/null 2>&1
}

# Remove any logs for all the following commands.
#
# usage: ynh_print_OFF
# WARNING: You should be careful with this helper, and never forgot to use ynh_print_ON as soon as possible to restore the logging.
ynh_print_OFF () {
	set +x
}

# Restore the logging after ynh_print_OFF
#
# usage: ynh_print_ON
ynh_print_ON () {
	set -x
	# Print an echo only for the log, to be able to know that ynh_print_ON has been called.
	echo ynh_print_ON > /dev/null
}

#=================================================

# Install or update the main directory yunohost.multimedia
#
# usage: ynh_multimedia_build_main_dir
ynh_multimedia_build_main_dir () {
        local ynh_media_release="v1.0"
        local checksum="4852c8607db820ad51f348da0dcf0c88"

        # Download yunohost.multimedia scripts
        wget -nv https://github.com/YunoHost-Apps/yunohost.multimedia/archive/${ynh_media_release}.tar.gz 

        # Check the control sum
        echo "${checksum} ${ynh_media_release}.tar.gz" | md5sum -c --status \
                || ynh_die "Corrupt source"

        # Extract
        mkdir yunohost.multimedia-master
        tar -xf ${ynh_media_release}.tar.gz -C yunohost.multimedia-master --strip-components 1
        ./yunohost.multimedia-master/script/ynh_media_build.sh
}

# Add a directory in yunohost.multimedia
# This "directory" will be a symbolic link to a existing directory.
#
# usage: ynh_multimedia_addfolder "Source directory" "Destination directory"
#
# | arg: Source directory - The real directory which contains your medias.
# | arg: Destination directory - The name and the place of the symbolic link, relative to "/home/yunohost.multimedia"
ynh_multimedia_addfolder () {
	local source_dir="$1"
	local dest_dir="$2"
	./yunohost.multimedia-master/script/ynh_media_addfolder.sh --source="$source_dir" --dest="$dest_dir"
}

# Move a directory in yunohost.multimedia, and replace by a symbolic link
#
# usage: ynh_multimedia_movefolder "Source directory" "Destination directory"
#
# | arg: Source directory - The real directory which contains your medias.
# It will be moved to "Destination directory"
# A symbolic link will replace it.
# | arg: Destination directory - The new name and place of the directory, relative to "/home/yunohost.multimedia"
ynh_multimedia_movefolder () {
	local source_dir="$1"
	local dest_dir="$2"
	./yunohost.multimedia-master/script/ynh_media_addfolder.sh --inv --source="$source_dir" --dest="$dest_dir"
}

# Allow an user to have an write authorisation in multimedia directories
#
# usage: ynh_multimedia_addaccess user_name
#
# | arg: user_name - The name of the user which gain this access.
ynh_multimedia_addaccess () {
	local user_name=$1
	groupadd -f multimedia
	usermod -a -G multimedia $user_name
}

#=================================================

# Create a dedicated fail2ban config (jail and filter conf files)
#
# usage: ynh_add_fail2ban_config log_file filter [max_retry [ports]]
# | arg: log_file - Log file to be checked by fail2ban
# | arg: failregex - Failregex to be looked for by fail2ban
# | arg: max_retry - Maximum number of retries allowed before banning IP address - default: 3
# | arg: ports - Ports blocked for a banned IP address - default: http,https
ynh_add_fail2ban_config () {
   # Process parameters
   logpath=$1
   failregex=$2
   max_retry=${3:-3}
   ports=${4:-http,https}
   
  test -n "$logpath" || ynh_die "ynh_add_fail2ban_config expects a logfile path as first argument and received nothing."
  test -n "$failregex" || ynh_die "ynh_add_fail2ban_config expects a failure regex as second argument and received nothing."
  
  finalfail2banjailconf="/etc/fail2ban/jail.d/$app.conf"
  finalfail2banfilterconf="/etc/fail2ban/filter.d/$app.conf"
  ynh_backup_if_checksum_is_different "$finalfail2banjailconf" 1
  ynh_backup_if_checksum_is_different "$finalfail2banfilterconf" 1
  
  sudo tee $finalfail2banjailconf <<EOF
[$app]
enabled = true
port = $ports
filter = $app
logpath = $logpath
maxretry = $max_retry
EOF

  sudo tee $finalfail2banfilterconf <<EOF
[INCLUDES]
before = common.conf
[Definition]
failregex = $failregex
ignoreregex =
EOF

  ynh_store_file_checksum "$finalfail2banjailconf"
  ynh_store_file_checksum "$finalfail2banfilterconf"
  
  systemctl reload fail2ban
  local fail2ban_error="$(journalctl -u fail2ban | tail -n50 | grep "WARNING.*$app.*")"
  if [ -n "$fail2ban_error" ]
  then
    echo "[ERR] Fail2ban failed to load the jail for $app" >&2
    echo "WARNING${fail2ban_error#*WARNING}" >&2
  fi
}

# Remove the dedicated fail2ban config (jail and filter conf files)
#
# usage: ynh_remove_fail2ban_config
ynh_remove_fail2ban_config () {
  ynh_secure_remove "/etc/fail2ban/jail.d/$app.conf"
  ynh_secure_remove "/etc/fail2ban/filter.d/$app.conf"
  systemctl reload fail2ban
}

#=================================================

# Read the value of a key in a ynh manifest file
#
# usage: ynh_read_manifest manifest key
# | arg: manifest - Path of the manifest to read
# | arg: key - Name of the key to find
ynh_read_manifest () {
	manifest="$1"
	key="$2"
	python3 -c "import sys, json;print(json.load(open('$manifest', encoding='utf-8'))['$key'])"
}

# Read the upstream version from the manifest 
# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
# For example : 4.3-2~ynh3
# This include the number before ~ynh
# In the last example it return 4.3-2
#
# usage: ynh_app_upstream_version
ynh_app_upstream_version () {
    manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
    fi
    version_key=$(ynh_read_manifest "$manifest_path" "version")
    echo "${version_key/~ynh*/}"
}

# Read package version from the manifest
# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
# For example : 4.3-2~ynh3
# This include the number after ~ynh
# In the last example it return 3
#
# usage: ynh_app_package_version
ynh_app_package_version () {
    manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
    fi
    version_key=$(ynh_read_manifest "$manifest_path" "version")
    echo "${version_key/*~ynh/}"
}

# Exit without error if the package is up to date
#
# This helper should be used to avoid an upgrade of a package
# when it's not needed.
#
# To force an upgrade, even if the package is up to date,
# you have to set the variable YNH_FORCE_UPGRADE before.
# example: sudo YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp
#
# usage: ynh_abort_if_up_to_date
ynh_abort_if_up_to_date () {
	local force_upgrade=${YNH_FORCE_UPGRADE:-0}
	local package_check=${PACKAGE_CHECK_EXEC:-0}

	local version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
	local last_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
	if [ "$version" = "$last_version" ]
	then
		if [ "$force_upgrade" != "0" ]
		then
			echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
			unset YNH_FORCE_UPGRADE
		elif [ "$package_check" != "0" ]
		then
			echo "Upgrade forced for package check." >&2
		else
			ynh_die "Up-to-date, nothing to do" 0
		fi
	fi
}

#=================================================

# Send an email to inform the administrator
#
# usage: ynh_send_readme_to_admin app_message [recipients]
# | arg: app_message - The message to send to the administrator.
# | arg: recipients - The recipients of this email. Use spaces to separate multiples recipients. - default: root
#	example: "root admin@domain"
#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
#	example: "root admin@domain user1 user2"
ynh_send_readme_to_admin() {
	local app_message="${1:-...No specific information...}"
	local recipients="${2:-root}"

	# Retrieve the email of users
	find_mails () {
		local list_mails="$1"
		local mail
		local recipients=" "
		# Read each mail in argument
		for mail in $list_mails
		do
			# Keep root or a real email address as it is
			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
			then
				recipients="$recipients $mail"
			else
				# But replace an user name without a domain after by its email
				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
				then
					recipients="$recipients $mail"
				fi
			fi
		done
		echo "$recipients"
	}
	recipients=$(find_mails "$recipients")

	local mail_subject="☁️🆈🅽🅷☁️: \`$app\` was just installed!"

	local mail_message="This is an automated message from your beloved YunoHost server.

Specific information for the application $app.

$app_message

---
Automatic diagnosis data from YunoHost

$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"

	# Define binary to use for mail command
	if [ -e /usr/bin/bsd-mailx ]
	then
		local mail_bin=/usr/bin/bsd-mailx
	else
		local mail_bin=/usr/bin/mail.mailutils
	fi

	# Send the email to the recipients
	echo "$mail_message" | $mail_bin -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
}

#=================================================

# Reload (or other actions) a service and print a log in case of failure.
#
# usage: ynh_system_reload service_name [action]
# | arg: service_name - Name of the service to reload
# | arg: action - Action to perform with systemctl. Default: reload
ynh_system_reload () {
        local service_name=$1
        local action=${2:-reload}

        # Reload, restart or start and print the log if the service fail to start or reload
        systemctl $action $service_name || ( journalctl --lines=20 -u $service_name >&2 && false)
}

#=================================================

ynh_debian_release () {
	lsb_release --codename --short
}

is_stretch () {
	if [ "$(ynh_debian_release)" == "stretch" ]
	then
		return 0
	else
		return 1
	fi
}

is_jessie () {
	if [ "$(ynh_debian_release)" == "jessie" ]
	then
		return 0
	else
		return 1
	fi
}

#=================================================

# Delete a file checksum from the app settings
#
# $app should be defined when calling this helper
#
# usage: ynh_remove_file_checksum file
# | arg: file - The file for which the checksum will be deleted
ynh_delete_file_checksum () {
	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
	ynh_app_setting_delete $app $checksum_setting_name
}

#=================================================

ynh_maintenance_mode_ON () {
	# Create an html to serve as maintenance notice
	echo "<!DOCTYPE html>
<html>
<head>
<meta http-equiv="refresh" content="3">
<title>Your app $app is currently under maintenance!</title>
<style>
	body {
		width: 70em;
		margin: 0 auto;
	}
</style>
</head>
<body>
<h1>Your app $app is currently under maintenance!</h1>
<p>This app has been put under maintenance by your administrator at $(date)</p>
<p>Please wait until the maintenance operation is done. This page will be reloaded as soon as your app will be back.</p>

</body>
</html>" > "/var/www/html/maintenance.$app.html"

	# Create a new nginx config file to redirect all access to the app to the maintenance notice instead.
	echo "# All request to the app will be redirected to ${path_url}_maintenance and fall on the maintenance notice
rewrite ^${path_url}/(.*)$ ${path_url}_maintenance/? redirect;
# Use another location, to not be in conflict with the original config file
location ${path_url}_maintenance/ {
alias /var/www/html/ ;

try_files maintenance.$app.html =503;

# Include SSOWAT user panel.
include conf.d/yunohost_panel.conf.inc;
}" > "/etc/nginx/conf.d/$domain.d/maintenance.$app.conf"

	# The current config file will redirect all requests to the root of the app.
	# To keep the full path, we can use the following rewrite rule:
	# 	rewrite ^${path_url}/(.*)$ ${path_url}_maintenance/\$1? redirect;
	# The difference will be in the $1 at the end, which keep the following queries.
	# But, if it works perfectly for a html request, there's an issue with any php files.
	# This files are treated as simple files, and will be downloaded by the browser.
	# Would be really be nice to be able to fix that issue. So that, when the page is reloaded after the maintenance, the user will be redirected to the real page he was.

	systemctl reload nginx
}

ynh_maintenance_mode_OFF () {
	# Rewrite the nginx config file to redirect from ${path_url}_maintenance to the real url of the app.
	echo "rewrite ^${path_url}_maintenance/(.*)$ ${path_url}/\$1 redirect;" > "/etc/nginx/conf.d/$domain.d/maintenance.$app.conf"
	systemctl reload nginx

	# Sleep 4 seconds to let the browser reload the pages and redirect the user to the app.
	sleep 4

	# Then remove the temporary files used for the maintenance.
	rm "/var/www/html/maintenance.$app.html"
	rm "/etc/nginx/conf.d/$domain.d/maintenance.$app.conf"

	systemctl reload nginx
}