#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Initial reading of the configuration file, typically called freedombone.cfg
#
# License
# =======
#
# Copyright (C) 2014-2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

configuration_variables=(FRIENDS_MIRRORS_SERVER
                         FRIENDS_MIRRORS_SSH_PORT
                         FRIENDS_MIRRORS_PASSWORD
                         MY_MIRRORS_PASSWORD
                         SYSTEM_TYPE
                         SSL_PROTOCOLS
                         SSL_CIPHERS
                         SSH_CIPHERS
                         SSH_MACS
                         SSH_KEX
                         SSH_HOST_KEY_ALGORITHMS
                         SSH_PASSWORDS
                         REFRESH_GPG_KEYS_HOURS
                         GPG_KEYSERVER
                         ENABLE_SOCIAL_KEY_MANAGEMENT
                         MY_USERNAME
                         DOMAIN_NAME
                         DEFAULT_DOMAIN_NAME
                         DEFAULT_DOMAIN_CODE
                         EMAIL_DOMAIN_CODE
                         XMPP_DOMAIN_CODE
                         NAMESERVER1
                         NAMESERVER2
                         GET_IP_ADDRESS_URL
                         DDNS_PROVIDER
                         DDNS_USERNAME
                         DDNS_PASSWORD
                         LOCAL_NETWORK_STATIC_IP_ADDRESS
                         ROUTER_IP_ADDRESS
                         CPU_CORES
                         WEBSERVER_LOG_LEVEL
                         ROUTE_THROUGH_TOR
                         MY_NAME
                         MY_EMAIL_ADDRESS
                         INSTALLING_ON_BBB
                         SSH_PORT
                         INSTALLED_WITHIN_DOCKER
                         GPG_ENCRYPT_STORED_EMAIL
                         MY_GPG_PUBLIC_KEY
                         MY_GPG_PRIVATE_KEY
                         MY_GPG_PUBLIC_KEY_ID
                         USB_DRIVE
                         MAX_PHP_MEMORY
                         ONION_ONLY
                         DEFAULT_LANGUAGE
                         MINIMAL_INSTALL
                         LETSENCRYPT_SERVER
                         WIFI_INTERFACE
                         WIFI_SSID
                         WIFI_TYPE
                         WIFI_PASSPHRASE
                         WIFI_HOTSPOT
                         WIFI_NETWORKS_FILE
                         DEFAULT_SEARCH
                         SEARCH_ENGINE_PASSWORD
                         PROJECT_WEBSITE
                         PROJECT_REPO
                         GPGIT_REPO
                         GPGIT_COMMIT
                         NGINX_ENSITE_REPO
                         NGINX_ENSITE_REPO
                         NGINX_ENSITE_COMMIT
                         CLEANUP_MAILDIR_COMMIT
                         CLEANUP_MAILDIR_REPO
                         INADYN_REPO
                         INADYN_COMMIT
                         DH_KEYLENGTH
                         WIFI_CHANNEL
                         IPV6_NETWORK
                         HWRNG_TYPE
                         ENABLE_BATMAN
                         PUBLIC_MAILING_LIST)

function get_completion_param {
    param_name="$1"

    if [ ${#param_name} -gt 0 ]; then
        if [ $COMPLETION_FILE ]; then
            if [ -f $COMPLETION_FILE ]; then
                if grep -q "${param_name}:" $COMPLETION_FILE; then
                    param_value=$(cat $COMPLETION_FILE | grep "${param_name}:" | head -n 1 | awk -F ':' '{print $2}')
                    echo "$param_value"
                    return
                fi
            fi
        fi
    fi
    echo ""
}

function set_completion_param {
    param_name="$1"
    param_value="$2"

    if [ ! $COMPLETION_FILE ]; then
        COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
    fi
    if [ ${#COMPLETION_FILE} -eq 0 ]; then
        COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
    fi

    if [ ${#param_name} -gt 0 ]; then
        if [ ${#param_value} -gt 0 ]; then
            if [ -f $COMPLETION_FILE ]; then
                if grep -q "${param_name}:" $COMPLETION_FILE; then
                    sed -i "s|${param_name}:.*|${param_name}:${param_value}|g" $COMPLETION_FILE
                else
                    echo "${param_name}:${param_value}" >> $COMPLETION_FILE
                fi
            else
                echo "${param_name}:${param_value}" > $COMPLETION_FILE
            fi
        fi
    fi
}

function mark_completed {
    param_name="$1"

    if [ ! $COMPLETION_FILE ]; then
        COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
    fi
    if [ ${#COMPLETION_FILE} -eq 0 ]; then
        COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
    fi

    if [ ${#param_name} -gt 0 ]; then
        if [ -f $COMPLETION_FILE ]; then
            if ! grep -Fxq "${param_name}" $COMPLETION_FILE; then
                echo "${param_name}" >> $COMPLETION_FILE
            fi
        else
            echo "${param_name}" > $COMPLETION_FILE
        fi
    fi
}

function is_completed {
    param_name="$1"

    if [ ! $COMPLETION_FILE ]; then
        COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
    fi
    if [ ${#COMPLETION_FILE} -eq 0 ]; then
        COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
    fi

    if [ ${#param_name} -gt 0 ]; then
        if [ -f $COMPLETION_FILE ]; then
            if grep -Fxq "${param_name}" $COMPLETION_FILE; then
                echo "1"
                return
            fi
        fi
    fi
    echo "0"
}

function read_config_param {
    param_name="$1"

    if [ ${#param_name} -gt 0 ]; then
        if [ $CONFIGURATION_FILE ]; then
            if [ -f $CONFIGURATION_FILE ]; then
                if grep -q "${param_name}=" $CONFIGURATION_FILE; then
                    param_value=$(cat $CONFIGURATION_FILE | grep "${param_name}=" | head -n 1 | awk -F '=' '{print $2}')
                    if [[ "${param_value}" != *" "* ]]; then
                        export ${param_name}=${param_value}
                    else
                        export ${param_name}="${param_value}"
                    fi
                fi
            fi
        fi
    fi
}

function config_param_exists {
    param_name="$1"

    if [ ${#param_name} -gt 0 ]; then
        if [ $CONFIGURATION_FILE ]; then
            if [ -f $CONFIGURATION_FILE ]; then
                if grep -q "${param_name}=" $CONFIGURATION_FILE; then
                    param_value=$(cat $CONFIGURATION_FILE | grep "${param_name}=" | head -n 1 | awk -F '=' '{print $2}')
                    if [ ${#param_value} -gt 0 ]; then
                        echo "1"
                        return
                    fi
                fi
            fi
        fi
    fi
    echo "0"
}

function write_config_param {
    param_name="$1"
    param_value="$2"

    if [ ! $CONFIGURATION_FILE ]; then
        CONFIGURATION_FILE=$HOME/${PROJECT_NAME}.cfg
    fi
    if [ ${#CONFIGURATION_FILE} -eq 0 ]; then
        CONFIGURATION_FILE=$HOME/${PROJECT_NAME}.cfg
    fi

    if [ ${#param_name} -gt 0 ]; then
        if [ ${#param_value} -gt 0 ]; then
            if [ -f $CONFIGURATION_FILE ]; then
                if grep -q "${param_name}=" $CONFIGURATION_FILE; then
                    sed -i "s|${param_name}=.*|${param_name}=${param_value}|g" $CONFIGURATION_FILE
                else
                    echo "${param_name}=${param_value}" >> $CONFIGURATION_FILE
                fi
            else
                echo "${param_name}=${param_value}" > $CONFIGURATION_FILE
            fi
        fi
    fi
}

function remove_config_param {
    param_name="$1"

    if [ ${#param_name} -gt 0 ]; then
        if [ $CONFIGURATION_FILE ]; then
            if [ -f $CONFIGURATION_FILE ]; then
                if grep -q "${param_name}=" $CONFIGURATION_FILE; then
                    sed -i "/${param_name}=/d" $CONFIGURATION_FILE
                fi
            fi
        fi
    fi
}

function remove_completion_param {
    param_name="$1"

    if [ ${#param_name} -gt 0 ]; then
        if [ $COMPLETION_FILE ]; then
            if [ -f $COMPLETION_FILE ]; then
                if grep -Fxq "${param_name}" $COMPLETION_FILE; then
                    sed -i "/${param_name}/d" $COMPLETION_FILE
                fi
                if grep -q "${param_name}:" $COMPLETION_FILE; then
                    sed -i "/${param_name}:/d" $COMPLETION_FILE
                fi
            fi
        fi
    fi
}

function save_configuration_values {
    for v in "${configuration_variables[@]}"
    do
        write_config_param "$v" "${!v}"
    done
}

function read_configuration_values {
    # if not installing on a Beaglebone then use sdb as the USB drive by default
    if [ ! $INSTALLING_ON_BBB ]; then
        if [[ $USB_DRIVE == /dev/sda1 ]]; then
            USB_DRIVE=/dev/sdb1
        fi
    fi

    if [ -f $CONFIGURATION_FILE ]; then
        read_repo_servers

        # Ensure that a copy of the config exists for upgrade purposes
        if [[ $CONFIGURATION_FILE != "/root/${PROJECT_NAME}.cfg" ]]; then
            cp $CONFIGURATION_FILE /root/${PROJECT_NAME}.cfg
        fi

        for v in "${configuration_variables[@]}"
        do
            read_config_param "$v"
        done

        if grep -q "DEBIAN_REPO" $CONFIGURATION_FILE; then
            read_config_param "DEBIAN_REPO"
            CHECK_MESSAGE=$"Check your internet connection, /etc/network/interfaces and /etc/resolv.conf, then delete $COMPLETION_FILE, run 'rm -fR /var/lib/apt/lists/* && apt-get update --fix-missing' and run this script again. If hash sum mismatches persist then try setting $DEBIAN_REPO to a different mirror and also change /etc/apt/sources.list."
        fi
    fi
}

function read_configuration {
    if [[ $INSTALLING_FROM_CONFIGURATION_FILE == "yes"  ]]; then
        if [ ! -f $CONFIGURATION_FILE ]; then
            echo $"The configuration file $CONFIGURATION_FILE was not found"
            exit 8935
        fi
    fi

    read_configuration_values
}

function check_system_type {
    if [ ${#SYSTEM_TYPE} -eq 0 ]; then
        echo $'Unknown system type'
        exit 763572
    fi
    echo "System type: $SYSTEM_TYPE"
}

# check that domain names are valid and that they are unique for each app
function check_domains {
    specified_domains=$(cat $CONFIGURATION_FILE | grep "_DOMAIN_NAME" | uniq)
    domains_array=($specified_domains)
    checked_domains=()

    for d in "${domains_array[@]}"
    do
        domain_param=$(echo "$d" | awk -F '=' '{print $1}')
        if [[ "$domain_param" != "DEFAULT_DOMAIN_NAME" ]]; then
            domain_value=$(echo "$d" | awk -F '=' '{print $2}')
            if [[ "$domain_value" != "${PROJECT_NAME}.local" ]]; then
                item_in_array "${domain_value}" "${checked_domains[@]}"
                if [[ $? != 0 ]]; then
                    # test that this is a valid domain name
                    function_check test_domain_name
                    test_domain_name "$domain_value"
                    # add it to the list of domains
                    checked_domains+=("$domain_value")
                else
                    echo $"Domain ${domain_value} collides with another app. The domain for each app should be unique."
                    exit 673925
                fi
            fi
        fi
    done
}

# NOTE: deliberately no exit 0