#!/bin/bash

# Handle script crashes / failures
#
# [internal]
#
# usage:
# ynh_exit_properly is used only by the helper ynh_abort_if_errors.
# You should not use it directly.
# Instead, add to your script:
# ynh_clean_setup () {
#        instructions...
# }
#
# This function provide a way to clean some residual of installation that not managed by remove script.
#
# It prints a warning to inform that the script was failed, and execute the ynh_clean_setup function if used in the app script
#
# Requires YunoHost version 2.6.4 or higher.
ynh_exit_properly () {
    local exit_code=$?
    if [ "$exit_code" -eq 0 ]; then
        exit 0	# Exit without error if the script ended correctly
    fi

    trap '' EXIT	# Ignore new exit signals
    # Do not exit anymore if a command fail or if a variable is empty
    set +o errexit  # set +e
    set +o nounset  # set +u

    # Small tempo to avoid the next message being mixed up with other DEBUG messages
    sleep 0.5

    if type -t ynh_clean_setup > /dev/null; then	# Check if the function exist in the app script.
        ynh_clean_setup	# Call the function to do specific cleaning for the app.
    fi

    ynh_die	# Exit with error status
}

# Exits if an error occurs during the execution of the script.
#
# usage: ynh_abort_if_errors
#
# This configure the rest of the script execution such that, if an error occurs
# or if an empty variable is used, the execution of the script stops
# immediately and a call to `ynh_clean_setup` is triggered if it has been
# defined by your script.
#
# Requires YunoHost version 2.6.4 or higher.
ynh_abort_if_errors () {
    set -o errexit  # set -e; Exit if a command fail
    set -o nounset  # set -u; And if a variable is used unset
    trap ynh_exit_properly EXIT	# Capturing exit signals on shell script
}

# Download, check integrity, uncompress and patch the source from app.src
#
# usage: ynh_setup_source --dest_dir=dest_dir [--source_id=source_id]
# | arg: -d, --dest_dir=    - Directory where to setup sources
# | arg: -s, --source_id=   - Name of the app, if the package contains more than one app
#
# The file conf/app.src need to contains:
#
# SOURCE_URL=Address to download the app archive
# SOURCE_SUM=Control sum
# # (Optional) Program to check the integrity (sha256sum, md5sum...)
# # default: sha256
# SOURCE_SUM_PRG=sha256
# # (Optional) Archive format
# # default: tar.gz
# SOURCE_FORMAT=tar.gz
# # (Optional) Put false if sources are directly in the archive root
# # default: true
# # Instead of true, SOURCE_IN_SUBDIR could be the number of sub directories
# # to remove.
# SOURCE_IN_SUBDIR=false
# # (Optionnal) Name of the local archive (offline setup support)
# # default: ${src_id}.${src_format}
# SOURCE_FILENAME=example.tar.gz
# # (Optional) If it set as false don't extract the source.
# # (Useful to get a debian package or a python wheel.)
# # default: true
# SOURCE_EXTRACT=(true|false)
#
# Details:
# This helper downloads sources from SOURCE_URL if there is no local source
# archive in /opt/yunohost-apps-src/APP_ID/SOURCE_FILENAME
#
# Next, it checks the integrity with "SOURCE_SUM_PRG -c --status" command.
#
# If it's ok, the source archive will be uncompressed in $dest_dir. If the
# SOURCE_IN_SUBDIR is true, the first level directory of the archive will be
# removed.
# If SOURCE_IN_SUBDIR is a numeric value, 2 for example, the 2 first level
# directories will be removed
#
# Finally, patches named sources/patches/${src_id}-*.patch and extra files in
# sources/extra_files/$src_id will be applied to dest_dir
#
# Requires YunoHost version 2.6.4 or higher.
ynh_setup_source () {
    # Declare an array to define the options of this helper.
    local legacy_args=ds
    local -A args_array=( [d]=dest_dir= [s]=source_id= )
    local dest_dir
    local source_id
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    source_id="${source_id:-app}" # If the argument is not given, source_id equals "app"

    local src_file_path="$YNH_CWD/../conf/${source_id}.src"
    # In case of restore script the src file is in an other path.
    # So try to use the restore path if the general path point to no file.
    if [ ! -e "$src_file_path" ]; then
        src_file_path="$YNH_CWD/../settings/conf/${source_id}.src"
    fi

    # Load value from configuration file (see above for a small doc about this file
    # format)
    local src_url=$(grep 'SOURCE_URL=' "$src_file_path" | cut --delimiter='=' --fields=2-)
    local src_sum=$(grep 'SOURCE_SUM=' "$src_file_path" | cut --delimiter='=' --fields=2-)
    local src_sumprg=$(grep 'SOURCE_SUM_PRG=' "$src_file_path" | cut --delimiter='=' --fields=2-)
    local src_format=$(grep 'SOURCE_FORMAT=' "$src_file_path" | cut --delimiter='=' --fields=2-)
    local src_extract=$(grep 'SOURCE_EXTRACT=' "$src_file_path" | cut --delimiter='=' --fields=2-)
    local src_in_subdir=$(grep 'SOURCE_IN_SUBDIR=' "$src_file_path" | cut --delimiter='=' --fields=2-)
    local src_filename=$(grep 'SOURCE_FILENAME=' "$src_file_path" | cut --delimiter='=' --fields=2-)

    # Default value
    src_sumprg=${src_sumprg:-sha256sum}
    src_in_subdir=${src_in_subdir:-true}
    src_format=${src_format:-tar.gz}
    src_format=$(echo "$src_format" | tr '[:upper:]' '[:lower:]')
    src_extract=${src_extract:-true}
    if [ "$src_filename" = "" ]; then
        src_filename="${source_id}.${src_format}"
    fi
    local local_src="/opt/yunohost-apps-src/${YNH_APP_ID}/${src_filename}"

    if test -e "$local_src"
    then    # Use the local source file if it is present
        cp $local_src $src_filename
    else    # If not, download the source
        local out=`wget --no-verbose --output-document=$src_filename $src_url 2>&1` || ynh_print_err --message="$out"
    fi

    # Check the control sum
    echo "${src_sum} ${src_filename}" | ${src_sumprg} --check --status \
        || ynh_die --message="Corrupt source"

    # Extract source into the app dir
    mkdir --parents "$dest_dir"

    if ! "$src_extract"
    then
        mv $src_filename $dest_dir
    elif [ "$src_format" = "zip" ]
    then
        # Zip format
        # Using of a temp directory, because unzip doesn't manage --strip-components
        if $src_in_subdir
        then
            local tmp_dir=$(mktemp --directory)
            unzip -quo $src_filename -d "$tmp_dir"
            cp --archive $tmp_dir/*/. "$dest_dir"
            ynh_secure_remove --file="$tmp_dir"
        else
            unzip -quo $src_filename -d "$dest_dir"
        fi
    else
        local strip=""
        if [ "$src_in_subdir" != "false" ]
        then
            if [ "$src_in_subdir" == "true" ]
            then
                local sub_dirs=1
            else
                local sub_dirs="$src_in_subdir"
            fi
            strip="--strip-components $sub_dirs"
        fi
        if [[ "$src_format" =~ ^tar.gz|tar.bz2|tar.xz$ ]]
        then
            tar --extract --file=$src_filename --directory="$dest_dir" $strip
        else
            ynh_die --message="Archive format unrecognized."
        fi
    fi

    # Apply patches
    if (( $(find $YNH_CWD/../sources/patches/ -type f -name "${source_id}-*.patch" 2> /dev/null | wc --lines) > "0" ))
    then
        (cd "$dest_dir"
        for p in $YNH_CWD/../sources/patches/${source_id}-*.patch
        do
            patch --strip=1 < $p
        done) || ynh_die --message="Unable to apply patches"
    fi

    # Add supplementary files
    if test -e "$YNH_CWD/../sources/extra_files/${source_id}"; then
        cp --archive $YNH_CWD/../sources/extra_files/$source_id/. "$dest_dir"
    fi
}

# Curl abstraction to help with POST requests to local pages (such as installation forms)
#
# example: ynh_local_curl "/install.php?installButton" "foo=$var1" "bar=$var2"
#
# usage: ynh_local_curl "page_uri" "key1=value1" "key2=value2" ...
# | arg: page_uri    - Path (relative to $path_url) of the page where POST data will be sent
# | arg: key1=value1 - (Optionnal) POST key and corresponding value
# | arg: key2=value2 - (Optionnal) Another POST key and corresponding value
# | arg: ...         - (Optionnal) More POST keys and values
#
# For multiple calls, cookies are persisted between each call for the same app
#
# $domain and $path_url should be defined externally (and correspond to the domain.tld and the /path (of the app?))
#
# Requires YunoHost version 2.6.4 or higher.
ynh_local_curl () {
    # Define url of page to curl
    local local_page=$(ynh_normalize_url_path $1)
    local full_path=$path_url$local_page

    if [ "${path_url}" == "/" ]; then
        full_path=$local_page
    fi

    local full_page_url=https://localhost$full_path

    # Concatenate all other arguments with '&' to prepare POST data
    local POST_data=""
    local arg=""
    for arg in "${@:2}"
    do
        POST_data="${POST_data}${arg}&"
    done
    if [ -n "$POST_data" ]
    then
        # Add --data arg and remove the last character, which is an unecessary '&'
        POST_data="--data ${POST_data::-1}"
    fi

    # Wait untils nginx has fully reloaded (avoid curl fail with http2)
    sleep 2
    
    local cookiefile=/tmp/ynh-$app-cookie.txt
    touch $cookiefile
    chown root $cookiefile
    chmod 700 $cookiefile

    # Curl the URL
    curl --silent --show-error --insecure --location --header "Host: $domain" --resolve $domain:443:127.0.0.1 $POST_data "$full_page_url" --cookie-jar $cookiefile --cookie $cookiefile
}

# Render templates with Jinja2
#
# [internal]
#
# Attention : Variables should be exported before calling this helper to be
# accessible inside templates.
#
# usage: ynh_render_template some_template output_path
# | arg: some_template - Template file to be rendered
# | arg: output_path   - The path where the output will be redirected to
ynh_render_template() {
    local template_path=$1
    local output_path=$2
    mkdir -p "$(dirname $output_path)"
    # Taken from https://stackoverflow.com/a/35009576
    python2.7 -c 'import os, sys, jinja2; sys.stdout.write(
                    jinja2.Template(sys.stdin.read()
                    ).render(os.environ));' < $template_path > $output_path
}

# Fetch the Debian release codename
#
# usage: ynh_get_debian_release
# | ret: The Debian release codename (i.e. jessie, stretch, ...)
#
# Requires YunoHost version 2.7.12 or higher.
ynh_get_debian_release () {
    echo $(lsb_release --codename --short)
}

# Create a directory under /tmp
#
# [internal]
#
# Deprecated helper
#
# usage: ynh_mkdir_tmp
# | ret: the created directory path
ynh_mkdir_tmp() {
    ynh_print_warn --message="The helper ynh_mkdir_tmp is deprecated."
    ynh_print_warn --message="You should use 'mktemp -d' instead and manage permissions \
properly with chmod/chown."
    local TMP_DIR=$(mktemp --directory)

    # Give rights to other users could be a security risk.
    # But for retrocompatibility we need it. (This helpers is deprecated)
    chmod 755 $TMP_DIR
    echo $TMP_DIR
}

# Remove a file or a directory securely
#
# usage: ynh_secure_remove --file=path_to_remove
# | arg: -f, --file=    - File or directory to remove
#
# Requires YunoHost version 2.6.4 or higher.
ynh_secure_remove () {
    # Declare an array to define the options of this helper.
    local legacy_args=f
    local -A args_array=( [f]=file= )
    local file
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    local forbidden_path=" \
    /var/www \
    /home/yunohost.app"

    if [ $# -ge 2 ]
    then
        ynh_print_warn --message="/!\ Packager ! You provided more than one argument to ynh_secure_remove but it will be ignored... Use this helper with one argument at time."
    fi

    if [[ -z "$file" ]]
    then
        ynh_print_warn --message="ynh_secure_remove called with empty argument, ignoring."
    elif [[ "$forbidden_path" =~ "$file" \
        # Match all paths or subpaths in $forbidden_path
        || "$file" =~ ^/[[:alnum:]]+$ \
        # Match all first level paths from / (Like /var, /root, etc...)
        || "${file:${#file}-1}" = "/" ]]
        # Match if the path finishes by /. Because it seems there is an empty variable
    then
        ynh_print_warn --message="Not deleting '$file' because it is not an acceptable path to delete."
    elif [ -e "$file" ]
    then
        rm --recursive "$file"
    else
        ynh_print_info --message="'$file' wasn't deleted because it doesn't exist."
    fi
}

# Extract a key from a plain command output
#
# [internal]
#
# example: yunohost user info tata --output-as plain | ynh_get_plain_key mail
#
# usage: ynh_get_plain_key key [subkey [subsubkey ...]]
# | ret: string - the key's value
#
# Requires YunoHost version 2.2.4 or higher.
ynh_get_plain_key() {
    local prefix="#"
    local founded=0
    # We call this key_ so that it's not caught as
    # an info to be redacted by the core
    local key_=$1
    shift
    while read line
    do
        if [[ "$founded" == "1" ]]
        then
            [[ "$line" =~ ^${prefix}[^#] ]] && return
            echo $line
        elif [[ "$line" =~ ^${prefix}${key_}$ ]]
        then
            if [[ -n "${1:-}" ]]
            then
                prefix+="#"
                key_=$1
                shift
            else
                founded=1
            fi
        fi
    done
}

# Read the value of a key in a ynh manifest file
#
# usage: ynh_read_manifest --manifest="manifest.json" --key="key"
# | arg: -m, --manifest=    - Path of the manifest to read
# | arg: -k, --key=         - Name of the key to find
# | ret: the value associate to that key
#
# Requires YunoHost version 3.5.0 or higher.
ynh_read_manifest () {
    # Declare an array to define the options of this helper.
    local legacy_args=mk
    local -A args_array=( [m]=manifest= [k]=manifest_key= )
    local manifest
    local manifest_key
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    if [ ! -e "$manifest" ]; then
        # If the manifest isn't found, try the common place for backup and restore script.
        manifest="../settings/manifest.json"
    fi

    jq ".$manifest_key" "$manifest" --raw-output
}

# Read the upstream version from the manifest
#
# usage: ynh_app_upstream_version [--manifest="manifest.json"]
# | arg: -m, --manifest=    - Path of the manifest to read
# | ret: the version number of the upstream app
#
# 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
#
# Requires YunoHost version 3.5.0 or higher.
ynh_app_upstream_version () {
    # Declare an array to define the options of this helper.
    local legacy_args=m
    local -A args_array=( [m]=manifest= )
    local manifest
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    manifest="${manifest:-../manifest.json}"

    version_key=$(ynh_read_manifest --manifest="$manifest" --manifest_key="version")
    echo "${version_key/~ynh*/}"
}

# Read package version from the manifest
#
# usage: ynh_app_package_version [--manifest="manifest.json"]
# | arg: -m, --manifest=    - Path of the manifest to read
# | ret: the version number of the package
#
# 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
#
# Requires YunoHost version 3.5.0 or higher.
ynh_app_package_version () {
    # Declare an array to define the options of this helper.
    local legacy_args=m
    local -A args_array=( [m]=manifest= )
    local manifest
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    manifest="${manifest:-../manifest.json}"

    version_key=$(ynh_read_manifest --manifest="$manifest" --manifest_key="version")
    echo "${version_key/*~ynh/}"
}

# Checks the app version to upgrade with the existing app version and returns:
#
# - UPGRADE_APP if the upstream app version has changed
# - UPGRADE_PACKAGE if only the YunoHost package has changed
#
# It stops the current script without error if the package is up-to-date
#
# This helper should be used to avoid an upgrade of an app, or the upstream part
# of it, 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_check_app_version_changed
#
# Requires YunoHost version 3.5.0 or higher.
ynh_check_app_version_changed () {
    local force_upgrade=${YNH_FORCE_UPGRADE:-0}
    local package_check=${PACKAGE_CHECK_EXEC:-0}

    # By default, upstream app version has changed
    local return_value="UPGRADE_APP"

    local current_version=$(ynh_read_manifest --manifest="/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" --manifest_key="version" || echo 1.0)
    local current_upstream_version="$(ynh_app_upstream_version --manifest="/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json")"
    local update_version=$(ynh_read_manifest --manifest="../manifest.json" --manifest_key="version" || echo 1.0)
    local update_upstream_version="$(ynh_app_upstream_version)"

    if [ "$current_version" == "$update_version" ]
    then
        # Complete versions are the same
        if [ "$force_upgrade" != "0" ]
        then
            ynh_print_info --message="Upgrade forced by YNH_FORCE_UPGRADE."
            unset YNH_FORCE_UPGRADE
        elif [ "$package_check" != "0" ]
        then
            ynh_print_info --message="Upgrade forced for package check."
        else
            ynh_die "Up-to-date, nothing to do" 0
        fi
    elif [ "$current_upstream_version" == "$update_upstream_version" ]
    then
        # Upstream versions are the same, only YunoHost package versions differ
        return_value="UPGRADE_PACKAGE"
    fi
    echo $return_value
}