#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Web based administration user interface
# typically abailanle on http://freedombone.local
#
# A background daemon running the freedombone-installer
# command is used to add and remove apps and handle
# initial setup of the box
#
# License
# =======
#
# Copyright © 2014-2018 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/>.

function web_admin_configure_installer_daemon {
    if [ -f /etc/systemd/system/webadmin.service ]; then
        return
    fi

    { echo '[Unit]';
      echo 'Description=Installer daemon for web admin';
      echo 'After=network.target';
      echo '';
      echo '[Service]';
      echo 'User=root';
      echo "ExecStart=/usr/local/bin/${PROJECT_NAME}-installer";
      echo "ExecReload=/bin/kill \$MAINPID";
      echo 'KillMode=process';
      echo 'Restart=always';
      echo '';
      echo '[Install]';
      echo 'WantedBy=multi-user.target';
      echo 'Alias=pleroma.service'; } > /etc/systemd/system/webadmin.service
    systemctl enable webadmin
    systemctl daemon-reload
    systemctl start webadmin
}

function web_admin_avahi {
    if [ -f /etc/avahi/services/webadmin.service ]; then
        return
    fi

    { echo '<?xml version="1.0" standalone="no"?><!--*-nxml-*-->';
      echo '<!DOCTYPE service-group SYSTEM "avahi-service.dtd">';
      echo '<service-group>';
      echo '  <name replace-wildcards="yes">%h http</name>';
      echo '  <service>';
      echo '    <type>_http._tcp</type>';
      echo '    <port>80</port>';
      echo '  </service>';
      echo '  <service>';
      echo '    <type>_https._tcp</type>';
      echo '    <port>443</port>';
      echo '  </service>';
      echo '</service-group>'; } > /etc/avahi/services/webadmin.service
    systemctl restart avahi-daemon
}

function web_admin_create_users {
    ADMIN_USER=$(get_completion_param "Admin user")
    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    users_file="/var/www/${local_hostname}/htdocs/admin/users.html"
    cp "/var/www/${local_hostname}/htdocs/admin/users_template.html" "$users_file"
    sed -i '/users list/,/end of users/d' "$users_file"
    sed -i '/<\/body>/d' "$users_file"
    sed -i '/<\/html>/d' "$users_file"

    echo "    <div class=\"row\">" >> "$users_file"
    echo "      <div class=\"column\">" >> "$users_file"

    rm "/var/www/${local_hostname}/htdocs/admin/userprofile_"*

    for d in /home/*/ ; do
        USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
            userfile="/var/www/${local_hostname}/htdocs/admin/userprofile_${USERNAME}.html"
            useremail=${USERNAME}@${DEFAULT_DOMAIN_NAME}
            GPG_ID=$(su -c "gpg --list-keys '$useremail'" - "$USERNAME" | sed -n '2p' | sed 's/^[ \t]*//')
            if [ -f "/home/$USERNAME/.gnupg/gpg.conf" ]; then
                if grep -q "default-key" "/home/$USERNAME/.gnupg/gpg.conf"; then
                    default_gpg_key=$(grep "default-key" "/home/$USERNAME/.gnupg/gpg.conf")
                    if [[ "$default_gpg_key" != *'#'* ]]; then
                        default_gpg_key=$(grep "default-key" "/home/$USERNAME/.gnupg/gpg.conf" | awk -F ' ' '{print $2}')
                        if [ ${#default_gpg_key} -gt 3 ]; then
                            GPG_ID=$(su -c "gpg --list-keys '$default_gpg_key'" - "$USERNAME" | sed -n '2p' | sed 's/^[ \t]*//')
                        fi
                    fi
                fi
            fi
            pubkey_qrcode="/var/www/${local_hostname}/htdocs/admin/userprofile_${USERNAME}.png"
            su -c "gpg --armor --export \"$GPG_ID\"" - "$USERNAME" | qrencode -t PNG -o "$pubkey_qrcode"

            { echo '        <div class="chip">';
              echo "          <a href=\"userprofile_${USERNAME}.html\">";
              echo '            <img src="admin_users.png" alt="Person" width="96" height="96">';
              echo "            $USERNAME";
              echo '          </a>';
              echo '        </div>'; } >> "$users_file"

            cp "/var/www/${local_hostname}/htdocs/admin/userprofile.html" "$userfile"
            sed -i "s|USERNAME|${USERNAME}|g" "$userfile"
            if [[ "$USERNAME" == "$ADMIN_USER" ]]; then
                sed -i "s|USERTYPE|Admin|g" "$userfile"
                sed -i '/remove user button/,/end of remove/d' "$userfile"
            else
                sed -i "s|USERTYPE|User|g" "$userfile"
            fi
            sed -i "s|USEREMAIL|${useremail}|g" "$userfile"
            sed -i "s|USERGPG|${GPG_ID}|g" "$userfile"

            chown www-data:www-data "$userfile"
            chown www-data:www-data "$pubkey_qrcode"
        fi
    done

    { echo '        <div class="chip">';
      echo "          <a href=\"newuser.html\">";
      echo '            <img src="admin_users.png" alt="Person" width="96" height="96">';
      echo '            +';
      echo '          </a>';
      echo '        </div>';
      echo '      </div>';
      echo '    </div>';
      echo '  </body>';
      echo '</html>'; } >> "$users_file"

    chown www-data:www-data "$users_file"
}

function web_admin_create_add_apps {
    read_config_param DDNS_PROVIDER
    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    apps_add_template_filename="/var/www/${local_hostname}/htdocs/admin/apps_add_template.html"
    appslist_add_filename="/var/www/${local_hostname}/htdocs/admin/apps_add.html"
    pending_installs="/var/www/${local_hostname}/htdocs/admin/pending_installs.txt"
    icons_dir="/var/www/${local_hostname}/htdocs/admin/icons"
    app_add_template_filename="/var/www/${local_hostname}/htdocs/admin/app_add_template.html"
    FILES="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*"

    if [ ! -d "$icons_dir" ]; then
        mkdir -p "$icons_dir"
    fi

    if [ ! -f "$apps_add_template_filename" ]; then
        return
    fi
    cp "$apps_add_template_filename" "$appslist_add_filename"
    sed -i '/<\/body>/d' "$appslist_add_filename"
    sed -i '/<\/html>/d' "$appslist_add_filename"

    available_apps_ctr=0
    app_index=0
    for filename in $FILES
    do
        app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')

        app_index=0
        app_is_installed=
        # shellcheck disable=SC2068
        for a in ${APPS_INSTALLED[@]}
        do
            installed_app_name=${APPS_INSTALLED_NAMES[$app_index]}
            if [[ "$installed_app_name" == "$app_name" ]]; then
                app_is_installed=1
                break
            fi

            app_index=$((app_index+1))
        done

        # check if the app is pending installation
        if [ -f "$pending_installs" ]; then
            if grep -q "install_${app_name}" "$pending_installs"; then
                app_is_installed=1
            fi
        fi

        if [ ! $app_is_installed ]; then
            app_filename="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"
            if [ -f "$app_filename" ]; then
                # get the icon for the app
                icon_filename="/usr/share/${PROJECT_NAME}/android-app/${app_name}.png"
                if [ -f "$icon_filename" ]; then
                    cp "$icon_filename" "/var/www/${local_hostname}/htdocs/admin/icons/${app_name}.png"
                else
                    icon_filename=
                    continue
                fi

                app_name_upper=$(echo "$app_name" | awk '{print toupper($0)}')
                SHORT_DESCRIPTION=
                DESCRIPTION=

                if ! grep -q "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                    continue
                fi
                if grep -q "#${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                    continue
                fi
                SHORT_DESCRIPTION="$(grep "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"

                if grep -q "${app_name_upper}_DESCRIPTION=" "$app_filename"; then
                    DESCRIPTION="$(grep "${app_name_upper}_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"
                fi

                if [ $available_apps_ctr -eq 0 ]; then
                    echo '    <div class="row">' >> "$appslist_add_filename"
                fi

                filename="/var/www/${local_hostname}/htdocs/admin/app_${app_name}.html"
                if [ -f "$filename" ]; then
                    rm "$filename"
                fi

                filename="/var/www/${local_hostname}/htdocs/admin/app_add_${app_name}.html"

                { echo '      <div class="column">';
                  echo '        <div>';
                  echo "          <a href=\"app_add_${app_name}.html\">";
                  echo "            <img src=\"icons/${app_name}.png\" style=\"width:100%\">";
                  echo "            <center>${app_name}</center>";
                  echo '          </a>';
                  echo '        </div>';
                  echo '      </div>'; } >> "$appslist_add_filename"

                cp "$app_add_template_filename" "$filename"

                # Replace app variables
                sed -i "s|HOSTNAME|$(hostname)|g" "$filename"
                sed -i "s|APPNAME|${app_name}|g" "$filename"
                sed -i "s|APPDESCRIPTION|${DESCRIPTION}|g" "$filename"

                # remove freedns if necessary
                if [[ "$DDNS_PROVIDER" != *"freedns"* ]]; then
                    sed -i '/freedns_code/d' "$filename"
                fi

                available_apps_ctr=$((available_apps_ctr+1))

                # four columns per row
                if [ $available_apps_ctr -eq 4 ]; then
                    echo '    </div>' >> "$appslist_add_filename"
                    available_apps_ctr=0
                fi
            fi
        fi
    done

    # Complete the rest of the four column row
    # shellcheck disable=SC2034
    for i in $(seq ${available_apps_ctr} 3)
    do
        { echo '      <div class="column">';
          echo '        <div>';
          echo '        </div>';
          echo '      </div>'; } >> "$appslist_add_filename"
    done

    echo '  </body>' >> "$appslist_add_filename"
    echo '</html>' >> "$appslist_add_filename"

    chown -R www-data:www-data "/var/www/${local_hostname}/htdocs/admin"
}

function web_admin_create_installed_apps {
    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
    appslist_template_filename="/var/www/${local_hostname}/htdocs/admin/apps_template.html"
    app_template_filename="/var/www/${local_hostname}/htdocs/admin/app_template.html"
    appslist_filename="/var/www/${local_hostname}/htdocs/admin/apps.html"
    icons_dir="/var/www/${local_hostname}/htdocs/admin/icons"
    pending_removes="/var/www/${local_hostname}/htdocs/admin/pending_removes.txt"

    if [ ! -d "$icons_dir" ]; then
        mkdir -p "$icons_dir"
    fi

    if [ ! -f "$appslist_template_filename" ]; then
        return
    fi
    cp "$appslist_template_filename" "$appslist_filename"
    sed -i '/<\/body>/d' "$appslist_filename"
    sed -i '/<\/html>/d' "$appslist_filename"

    installed_apps_ctr=0
    app_index=0
    # shellcheck disable=SC2068,SC2034
    for a in ${APPS_INSTALLED[@]}
    do
        app_name=${APPS_INSTALLED_NAMES[$app_index]}
        if [ "$app_name" ]; then
            app_filename="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"
            if [ -f "$app_filename" ]; then

                # check if the app is being removed
                app_being_removed=
                if [ -f "$pending_removes" ]; then
                    if grep -q "remove_${app_name}" "$pending_removes"; then
                        app_being_removed=1
                    fi
                fi

                if [ ! $app_being_removed ]; then
                    # get the icon for the app
                    icon_filename="/usr/share/${PROJECT_NAME}/android-app/${app_name}.png"
                    if [ -f "$icon_filename" ]; then
                        cp "$icon_filename" "/var/www/${local_hostname}/htdocs/admin/icons/${app_name}.png"
                    else
                        icon_filename=
                    fi

                    app_name_upper=$(echo "$app_name" | awk '{print toupper($0)}')
                    SHORT_DESCRIPTION=
                    DESCRIPTION=

                    if ! grep -q "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                        app_index=$((app_index+1))
                        continue
                    fi
                    if grep -q "#${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename"; then
                        app_index=$((app_index+1))
                        continue
                    fi
                    SHORT_DESCRIPTION="$(grep "${app_name_upper}_SHORT_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"

                    if grep -q "${app_name_upper}_DESCRIPTION=" "$app_filename"; then
                        DESCRIPTION="$(grep "${app_name_upper}_DESCRIPTION=" "$app_filename" | head -n 1 | sed 's|\$||g' | sed "s|'||g" | sed 's|\"||g' | awk -F '=' '{print $2}')"
                    fi

                    read_config_param "${app_name_upper}_DOMAIN_NAME"
                    test_domain_name="${app_name_upper}_DOMAIN_NAME"
                    domain_name=${!test_domain_name}
                    if [ "$domain_name" ]; then
                        if [[ "$domain_name" != *'.onion' ]]; then
                            domain_name="https://${!test_domain_name}"
                        else
                            domain_name="http://${!test_domain_name}"
                        fi
                    fi

                    if [ $installed_apps_ctr -eq 0 ]; then
                        echo '    <div class="row">' >> "$appslist_filename"
                    fi

                    filename="/var/www/${local_hostname}/htdocs/admin/app_add_${app_name}.html"
                    if [ -f "$filename" ]; then
                        rm "$filename"
                    fi

                    filename="/var/www/${local_hostname}/htdocs/admin/app_${app_name}.html"

                    { echo '      <div class="column">';
                      echo '        <div>';
                      echo "          <a href=\"app_${app_name}.html\">";
                      echo "            <img src=\"icons/${app_name}.png\" style=\"width:100%\">";
                      echo "            <center>${app_name}</center>";
                      echo '          </a>';
                      echo '        </div>';
                      echo '      </div>'; } >> "$appslist_filename"

                    cp "$app_template_filename" "$filename"

                    # Replace app variables
                    sed -i "s|HOSTNAME|$(hostname)|g" "$filename"
                    sed -i "s|APPNAME|${app_name}|g" "$filename"
                    sed -i "s|APPURL|${domain_name}|g" "$filename"
                    sed -i "s|APPDESCRIPTION|${DESCRIPTION}|g" "$filename"

                    installed_apps_ctr=$((installed_apps_ctr+1))

                    # four columns per row
                    if [ $installed_apps_ctr -eq 4 ]; then
                        echo '    </div>' >> "$appslist_filename"
                        installed_apps_ctr=0
                    fi
                fi
            fi
        fi
        app_index=$((app_index+1))
    done

    # Complete the rest of the four column row
    # shellcheck disable=SC2034
    for i in $(seq ${installed_apps_ctr} 3)
    do
        { echo '      <div class="column">';
          echo '        <div>';
          echo '        </div>';
          echo '      </div>'; } >> "$appslist_filename"
    done

    echo '  </body>' >> "$appslist_filename"
    echo '</html>' >> "$appslist_filename"

    chown -R www-data:www-data "/var/www/${local_hostname}/htdocs/admin"
}

function install_web_admin {
    # This is intended as an admin web user interface
    # similar to Plinth or the yunohost

    local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local

    if [ ! -d "/var/www/${local_hostname}/htdocs/admin" ]; then
        mkdir -p "/var/www/${local_hostname}/htdocs/admin"
    fi

    if [ -d "/usr/share/${PROJECT_NAME}/webadmin" ]; then
        cp -r "/usr/share/${PROJECT_NAME}/webadmin"/* "/var/www/${local_hostname}/htdocs/admin"
    else
        echo "install_web_admin 5" > /tmp/debugweb
        { echo '<html>';
          echo '  <body>';
          echo "  This is a placeholder for the web admin panel on ${local_hostname}";
          echo '  </body>';
          echo '</html>'; } > "/var/www/${local_hostname}/htdocs/admin/index.html"
    fi

    nginx_file=/etc/nginx/sites-available/$local_hostname
    { echo 'server {';
      echo '  listen 80 default_server;';
      echo '  #listen [::]:80;';
      echo "  server_name ${local_hostname};";
      echo "  root /var/www/${local_hostname}/htdocs;";
      echo '  index index.html;';
      echo '';
      echo '  access_log /dev/null;';
      echo '  error_log /dev/null;';
      echo '';
      echo '  location ^~ /admin {';
      echo "    root /var/www/${local_hostname}/htdocs;";
      echo '    index index.html;';
      echo "    error_page 405 = \$uri;";
      echo '    location ~ \.php {';
      echo '      include snippets/fastcgi-php.conf;';
      echo '      fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
      echo '      fastcgi_read_timeout 30;';
      echo '    }';
      echo '  }';
      echo '';
      echo '  location /icons {';
      echo '    autoindex on;';
      echo '    break;';
      echo '  }';
      echo '';
      echo '  rewrite ^/plinth/(.*)$ /api.json last;';
      echo '';
      echo '  location / {';
      echo "    root /var/www/${local_hostname}/htdocs/plinth;";
      echo '    index api.json /api.json;';
      echo "    error_page 405 = \$uri;";
      echo '  }';
      echo '}';
      echo '';
      echo 'server {';
      echo '  listen 443 default_server ssl;';
      echo '  #listen [::]:443 ssl;';
      echo "  server_name ${local_hostname};";
      echo "  root /var/www/${local_hostname}/htdocs;";
      echo '  index index.html;';
      echo '';
      echo '  access_log /dev/null;';
      echo '  error_log /dev/null;';
      echo ''; } > "$nginx_file"

    nginx_ssl "${local_hostname}"
    nginx_security_options "${local_hostname}"

    { echo '  add_header Strict-Transport-Security max-age=0;';
      echo '';
      echo '  location ^~ /admin {';
      echo "    root /var/www/${local_hostname}/htdocs;";
      echo '    index index.html;';
      echo "    error_page 405 = \$uri;";
      echo '    location ~ \.php {';
      echo '      include snippets/fastcgi-php.conf;';
      echo '      fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
      echo '      fastcgi_read_timeout 30;';
      echo '    }';
      echo '  }';
      echo '';
      echo '  location /icons {';
      echo '    autoindex on;';
      echo '    break;';
      echo '  }';
      echo '';
      echo '  rewrite ^/plinth/(.*)$ /api.json last;';
      echo '';
      echo '  location / {';
      echo "    root /var/www/${local_hostname}/htdocs/plinth;";
      echo '    index api.json /api.json;';
      echo "    error_page 405 = \$uri;";
      echo '  }';
      echo '}'; } >> "$nginx_file"

    if [ ! -f "/etc/ssl/certs/${local_hostname}.crt" ]; then
        "${PROJECT_NAME}-addcert" -h "${local_hostname}" --dhkey "${DH_KEYLENGTH}"
    fi

    sed -i "s|ssl_certificate .*|ssl_certificate /etc/ssl/certs/${local_hostname}.crt;|g" "$nginx_file"
    sed -i "s|ssl_certificate_key .*|ssl_certificate_key /etc/ssl/private/${local_hostname}.key;|g" "$nginx_file"

    nginx_ensite "${local_hostname}"

    # Compatibility with FreedomBox android app
    # The installed apps get published to a json file called api.json
    # in this directory
    if [ ! -d "/var/www/${local_hostname}/htdocs/plinth" ]; then
        mkdir -p "/var/www/${local_hostname}/htdocs/plinth"
    fi

    web_admin_create_users

    # make list of apps which can be added
    web_admin_create_add_apps

    # make the list of apps
    web_admin_create_installed_apps

    chown -R www-data:www-data "/var/www/${local_hostname}/htdocs"

    web_admin_avahi

    web_admin_configure_installer_daemon
}

# NOTE: deliberately no exit 0