wis2box-create-config.py

###############################################################################
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#
###############################################################################
import datetime
import json
import os
import platform
from pathlib import Path
import random
import string
from string import Template
from typing import Tuple

# Identify platform type
WINDOWS = False
if platform.system() == 'Windows':
    WINDOWS = True

if not WINDOWS:
    import grp
    import shutil
    DOCKER_GROUP = grp.getgrnam('docker')

OTHER_TLDS = ['org', 'int']


def get_country_name(country_code: str) -> str:
    """
    provide the country name for the wis2box
    using the country's TLD code
    using the data from config-templates/bounding_box_lookup.json

    :param country_code: `str` of TLD code of the country

    :returns: `str` of country name
    """

    country_name = 'NA'
    # get the path to the data
    data_path = Path(__file__).parent / 'config-templates' / 'countries.json'

    # open the file
    with data_path.open() as fh:
        # load the data
        data = json.load(fh)
        # get the bounding box for the country
        try:
            country_name = data['countries'][country_code]['name']
        except KeyError:
            pass

    return country_name


def get_bounding_box(country_code: str) -> Tuple[str, str]:
    """
    provide the initial bounding box for the wis2box
    using the country's TLD code
    using the data from config-templates/bounding_box_lookup.json

    use bounding box for the whole world if no value is found in
    the config-templates/bounding_box_lookup.json file

    :param country_code: `str` of TLD code of the country

    :returns: `tuple` of (country_name, bbox)
    """

    country_name = 'NA'
    bounding_box = '-180, -90, 180, 90'

    print(f'Getting bounding box for "{country_code}".')

    # get the path to the data
    data_path = Path(__file__).parent / 'config-templates' / 'countries.json'

    # open the file
    with data_path.open() as fh:
        # load the data
        data = json.load(fh)
        # get the bounding box for the country
        if country_code in data['countries'] and 'bbox' in data['countries'][country_code]:  # noqa
            country_name = data['countries'][country_code]['name']
            bbox = data['countries'][country_code]['bbox']
            if not {'minx', 'miny', 'maxx', 'maxy'} <= bbox.keys():
                print(f'Bounding box for "{country_code}" is invalid.')
                print('Using global bounding box.')
            else:
                minx = bbox['minx']
                miny = bbox['miny']
                maxx = bbox['maxx']
                maxy = bbox['maxy']
                # create bounding box as a CSV of four numbers
                bounding_box = f'{minx},{miny},{maxx},{maxy}'
        else:
            print(f'No bounding box found for "{country_code}".')
            print('Using the bounding box for the whole world.')

    # ask the user to accept the bounding box or to enter a new one
    print(f'bounding box: {bounding_box}.')
    print('Do you want to use this bounding box? (y/n/exit)')
    answer = input()

    while answer not in ['y', 'exit']:
        print('Please enter the bounding box as a comma-separated list of four numbers:') # noqa
        print('The first two numbers are the coordinates of the lower left corner of the bounding box.') # noqa
        print('The last two numbers are the coordinates of the upper right corner of the bounding box.') # noqa
        print('For example: 5.5,47.2,15.5,55.2')
        bounding_box = input()
        print(f'bounding box: {bounding_box}.')
        print('Do you want to use this bounding box? (y/n/exit)')
        answer = input()

    if answer == 'exit':
        exit()

    return country_name, bounding_box


def get_tld_and_centre_id() -> Tuple[str, str]:
    """
    Asks the user for the TLD
    and a string identifying the centre hosting the wis2box.

    :returns: `tuple` of (country_code, centre_id)
    """

    answer = ''
    country_code = ''
    while answer != 'y':
        if answer == 'exit':
            exit()

        print('Please enter your ccTLD (2-letter country code) or other TLD:') # noqa
        country_code = input()

        # check that the input is a 2-letter string or a relevant TLD
        # if not repeat the question
        while country_code not in OTHER_TLDS and len(country_code) != 2:
            print(f'The country code must be a 2-letter ISO code or another relevant TLD (e.g. {OTHER_TLDS}).') # noqa
            print('Please enter your 2-letter ISO country code (or TLD):') # noqa
            country_code = input()

        # make sure the country code is lowercase
        country_code = country_code.lower()

        # check the country name
        country_name = get_country_name(country_code)
        if country_name == 'NA':
            print(f'No country-name found for TLD={country_code} !')

        # ask the user to confirm their choice and give them the option to change it # noqa
        print('Your TLD corresponds to: ')
        print(f'  {country_code} (country_name={country_name})')
        print('Is this correct? (y/n/exit)')
        answer = input()

    answer = ''
    centre_id = ''
    while answer != 'y':
        if answer == 'exit':
            exit()
        print('Please enter the centre-id for your wis2box:')
        centre_id = str(input()).lower()

        # check that the input is valid
        # if not repeat the question
        while any([x in centre_id for x in ['#', '+', ' ']]) or len(centre_id) < 6 or not centre_id.startswith(country_code + '-'):  # noqa
            if not centre_id.startswith(country_code + '-'):
                print(f' !!! The centre-id must start with {country_code}-')
                print(f' For example: {country_code}-mycentre')
            if any([x in centre_id for x in ['#', '+', ' ']]):
                print(' !!! The centre-id cannot contain spaces or the "+" or "#" characters') # noqa
            if len(centre_id) < 5:
                print(' !!! The centre-id must be at least 6 characters long.')
            print('Please enter the centre-id for your wis2box:')
            centre_id = str(input()).lower()

        # ask the user to confirm their choice and give them the option to change it # noqa
        print('The centre-id will be set to:')
        print(f'  {centre_id}')
        print('Is this correct? (y/n/exit)')
        answer = input()

    return (country_code, centre_id)


def get_password(password_name: str) -> str:
    """
    asks the user to enter a password or to use a randomly generated password

    :param password_name: `str` of password entered

    :returns: `str` of password to be used
    """

    password = None

    answer = ''
    while answer not in ['y', 'n']:
        if answer == 'exit':
            exit()

        print(f'Do you want to use a randomly generated password for {password_name} (y/n/exit)') # noqa
        answer = input()

    if answer == 'y':
        password = ''.join(random.choice(string.ascii_letters + string.digits) for i in range(8)) # noqa
        print(f'{password_name}={password}')

    while answer != 'y':
        if answer == 'exit':
            exit()

        print(f'Please enter the password to be used for the {password_name}:') # noqa
        password = input()

        # check if the password is at least 8 characters long
        # if not repeat the question
        while len(password) < 8:
            print('The password must be at least 8 characters long.')
            print(f'Please enter the password to be used for the {password_name}:') # noqa
            password = input()

        print(f'{password_name}={password}')
        print('Is this correct? (y/n/exit)')
        answer = input()

    return f"{password_name}={password}\n"


def get_wis2box_url() -> str:
    """
    asks the user to enter the URL of the wis2box

    :returns: `str` of wis2box URL
    """

    wis2box_url = None
    answer = ''

    while answer != 'y':
        if answer == 'exit':
            exit()

        # ask for the WIS2BOX_URL, use http://localhost as the default
        print('Please enter the URL of the wis2box:')
        print(' For local testing the URL is http://localhost') # noqa
        print(' To enable remote access, the URL should point to the public IP address or domain name of the server hosting the wis2box.') # noqa

        # check if the URL starts with http:// or https://
        # if not, ask the user to enter the URL again
        wis2box_url = ''
        wis2box_url = input()

        while not wis2box_url.startswith(('http://', 'https://')):
            print('The URL must start with http:// or https://')
            print('Please enter the URL of the wis2box:')
            wis2box_url = input()

        # ask the user to confirm their choice and give them the option to change it # noqa
        print('The URL of the wis2box will be set to:')
        print(f'  {wis2box_url}')
        print('Is this correct? (y/n/exit)')
        answer = input()

    return wis2box_url


def create_wis2box_env(host_datadir: str) -> None:
    """
    creates the wis2box.env file in the host_datadir

    :param host_datadir: `str` of path to the config directory

    :returns: None
    """

    wis2box_env = Path('wis2box.env')

    with wis2box_env.open('w') as fh:
        fh.write('# directory on the host with wis2box-configuration\n') # noqa
        fh.write(f'WIS2BOX_HOST_DATADIR={host_datadir}\n')
        fh.write(f'# directory in the wis2box container with wis2box-configuration\n') # noqa
        fh.write('WIS2BOX_DATADIR=/data/wis2box\n')
        fh.write('\n')
        wis2box_url = get_wis2box_url()
        fh.write('# wis2box public URL\n')
        fh.write(f'WIS2BOX_URL={wis2box_url}\n')
        fh.write('WIS2BOX_UI_CLUSTER=false\n')
        fh.write('WIS2BOX_UI_LANG=en\n')
        fh.write('\n')
        fh.write('# api\n')
        fh.write('WIS2BOX_API_TYPE=pygeoapi\n')
        fh.write(f'WIS2BOX_API_URL={wis2box_url}/oapi\n')
        fh.write('WIS2BOX_DOCKER_API_URL=http://wis2box-api:80/oapi\n')
        fh.write('\n')
        fh.write('# backend\n')
        fh.write('WIS2BOX_API_BACKEND_TYPE=Elasticsearch\n')
        fh.write('WIS2BOX_API_BACKEND_URL=http://elasticsearch:9200\n')
        fh.write('\n')
        fh.write('# logging\n')
        fh.write('WIS2BOX_LOGGING_LOGLEVEL=WARNING\n')
        fh.write('WIS2BOX_LOGGING_LOGFILE=stdout\n')
        fh.write('\n')
        fh.write('# WIS2BOX WEBAPP credentials\n')
        fh.write('WIS2BOX_WEBAPP_USERNAME=wis2box-user\n')
        # get password for WIS2BOX_WEBAPP_PASSWORD and write it to wis2box.env
        fh.write(get_password('WIS2BOX_WEBAPP_PASSWORD'))
        fh.write('\n')
        fh.write('# map settings for wis2box-ui, wis2box-api and wis2box-webapp\n') # noqa
        fh.write('WIS2BOX_BASEMAP_URL=https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png\n') # noqa
        fh.write('WIS2BOX_BASEMAP_ATTRIBUTION=<a href="https://osm.org/copyright">OpenStreetMap</a> contributors\n') # noqa
        fh.write('\n')
        fh.write('# storage, default is S3 provided by minio\n')
        fh.write('WIS2BOX_STORAGE_TYPE=S3\n')
        fh.write('WIS2BOX_STORAGE_SOURCE=http://minio:9000\n')
        fh.write('WIS2BOX_STORAGE_INCOMING=wis2box-incoming\n')
        fh.write('WIS2BOX_STORAGE_ARCHIVE=wis2box-archive\n')
        fh.write('WIS2BOX_STORAGE_PUBLIC=wis2box-public\n')
        fh.write('WIS2BOX_STORAGE_DATA_RETENTION_DAYS=30\n')
        # use the default username wis2box for WIS2BOX_STORAGE_USERNAME
        fh.write('WIS2BOX_STORAGE_USERNAME=wis2box\n')
        # get password for WIS2BOX_STORAGE_PASSWORD and write it to wis2box.env
        fh.write(get_password('WIS2BOX_STORAGE_PASSWORD'))
        fh.write('\n')
        # write default port and host for WIS2BOX_BROKER
        fh.write('# broker settings\n')
        fh.write('WIS2BOX_BROKER_PORT=1883\n')
        fh.write('WIS2BOX_BROKER_HOST=mosquitto\n')
        # use the default username wis2box for WIS2BOX_BROKER_USERNAME
        fh.write('WIS2BOX_BROKER_USERNAME=wis2box\n')
        fh.write('WIS2BOX_BROKER_QUEUE_MAX=1000\n')
        # get password for WIS2BOX_BROKER_PASSWORD and write it to wis2box.env
        fh.write(get_password('WIS2BOX_BROKER_PASSWORD'))
        fh.write('\n')
        # update WIS2BOX_BROKER_PUBLIC settings after updating broker defaults
        fh.write('# update WIS2BOX_BROKER_PUBLIC settings after updating broker defaults\n') # noqa
        fh.write('WIS2BOX_BROKER_PUBLIC=mqtt://${WIS2BOX_BROKER_USERNAME}:${WIS2BOX_BROKER_PASSWORD}@mosquitto:1883\n') # noqa
        # update minio settings after updating storage and broker defaults
        fh.write('\n')
        fh.write('# minio settings\n') # noqa
        # MinIO
        fh.write('MINIO_ROOT_USER=${WIS2BOX_STORAGE_USERNAME}\n')
        fh.write('MINIO_ROOT_PASSWORD=${WIS2BOX_STORAGE_PASSWORD}\n')
        fh.write('MINIO_PROMETHEUS_AUTH_TYPE=public\n')
        fh.write('MINIO_NOTIFY_MQTT_ENABLE_WIS2BOX=on\n')
        fh.write('MINIO_NOTIFY_MQTT_USERNAME_WIS2BOX=${WIS2BOX_BROKER_USERNAME}\n') # noqa
        fh.write('MINIO_NOTIFY_MQTT_PASSWORD_WIS2BOX=${WIS2BOX_BROKER_PASSWORD}\n') # noqa
        fh.write('MINIO_NOTIFY_MQTT_BROKER_WIS2BOX=tcp://${WIS2BOX_BROKER_HOST}:${WIS2BOX_BROKER_PORT}\n') # noqa
        fh.write('MINIO_NOTIFY_MQTT_TOPIC_WIS2BOX=wis2box/storage\n')
        fh.write('MINIO_NOTIFY_MQTT_QOS_WIS2BOX=1\n')
        fh.write('\n')
        # downloader settings
        fh.write('# downloader settings\n')
        fh.write('DOWNLOAD_BROKER_HOST=globalbroker.meteo.fr\n')
        fh.write('DOWNLOAD_BROKER_PORT=443\n')
        fh.write('DOWNLOAD_BROKER_USERNAME=everyone\n')
        fh.write('DOWNLOAD_BROKER_PASSWORD=everyone\n')
        fh.write('# download transport mechanism (tcp or websockets)\n')
        fh.write('DOWNLOAD_BROKER_TRANSPORT=websockets\n')
        fh.write('# maximum MB in download directory\n')
        fh.write('DOWNLOAD_MIN_FREE_SPACE_GB=1\n')
        if not WINDOWS:
            fh.write(f'DOCKER_GID={DOCKER_GROUP.gr_gid}\n')
        fh.write('\n')

    print('*' * 80)
    print('The file wis2box.env has been created in the current directory.')
    print('*' * 80)


def create_host_datadir() -> str:
    """
    Creates the directory wis2box_host_datadir

    If the directory already exists, asks the user if they want to overwrite
    the existing files

    :returns: `str` of path to directory for wis2box_host_datadir
    """

    host_datadir = ""
    answer = "n"

    while answer != "y":
        if answer == "exit":
            exit()

        print("Please enter the directory to be used for WIS2BOX_HOST_DATADIR:") # noqa
        host_datadir = input()

        if host_datadir == "":
            print("The directory cannot be empty.")
            continue

        print("The directory to be used for WIS2BOX_HOST_DATADIR will be set to:") # noqa
        print(f"    {host_datadir}")
        print("Is this correct? (y/n/exit)")
        answer = input()

    # check if the directory exists
    try:
        host_datadir = Path(host_datadir)
        if host_datadir.is_dir():
            # if it exists warn the user
            # tell them that the directory needs to be remove to continue
            print("WARNING:")
            print(f"The directory {host_datadir} already exists.")
            print("Please remove the directory to restart the configuration process.") # noqa
            exit()
        else:
            # if it does not exist, create it
            host_datadir.mkdir(parents=True)
            # check if the directory was created
            if not host_datadir.is_dir():
                print("ERROR:")
                print(f"The directory {host_datadir} could not be created.")
                print("Please check the path and your permissions.")
                exit()
        print(f"The directory {host_datadir} has been created.")

        download_dir = host_datadir / 'downloads'
        download_dir.mkdir(mode=0o775)
        if not WINDOWS:
            shutil.chown(download_dir, group='docker')

    except Exception:
        print("ERROR:")
        print(f"The directory {host_datadir} could not be created.")
        print("Please provide an absolute path to the directory.")
        print("and check your permissions.")
        exit()

    return host_datadir


def create_metadata_file(host_datadir: str, country_name: str,
                         centre_id: str, centre_name: str, wis2box_email: str,
                         bounding_box: str, template: str) -> str:
    """
    creates the metadata file in the directory host_datadir

    :param host_datadir: `str` of the path to the wis2box-host-datadir
    :param country_name: `str` of the country name of the wis2box
    :param centre_id: `str` of the centre id of the wis2box
    :param centre_name: `str` of centre name of the wis2box
    :param wis2box_email: `str` of centre email
    :param bounding_box: `str` of CSV of bounding box
    :param template: `str` of synop or temp

    :returns: `str` of the path to the metadata file
    """

    # get current date as a string
    current_date = datetime.datetime.now().strftime("%Y-%m-%d")

    host_datadir = Path(host_datadir)
    discovery_metadata_dir = host_datadir / 'metadata' / 'discovery'

    # create directory for discovery metadata if it does not exist
    if not discovery_metadata_dir.exists():
        discovery_metadata_dir.mkdir(parents=True)

    new_config_file = discovery_metadata_dir / f'metadata-{template}-{centre_id}.yml' # noqa
    template_file = Path('config-templates') / f'metadata-{template}.yml.tmpl'  # noqa

    template_vars = {
        'PUBLICATION_DATE': current_date,
        'START_DATE': current_date,
        'CREATION_DATE': current_date,
        'COUNTRY_NAME': country_name,
        'CENTRE_ID': centre_id,
        'CENTRE_NAME': centre_name,
        'WIS2BOX_EMAIL': wis2box_email,
        'BOUNDING_BOX': bounding_box
    }

    with template_file.open() as fh:
        config_file = Template(fh.read())
        result = config_file.substitute(template_vars)
        with new_config_file.open("w") as fh2:
            fh2.write(result)
            print(f"Created new metadata file: {new_config_file}")

    return new_config_file.name


def create_metadata_files(host_datadir: str, country_code: str,
                          centre_id: str) -> None:
    """
    creates the metadata files in the directory host_datadir

    :host_datadir: `str` of path to directory where configuration files
                 are to be stored # noqa
    :country_code: `str` of country code of the country hosting the wis2box
    :centre_id: `str` of centre id of the organization hosting the wis2box

    :returns: None
    """

    # ask for the email address of the wis2box administrator
    answer = ""
    wis2box_email = ""

    while answer != "y":
        if answer == "exit":
            exit()

        print(f"Please enter the email address of the wis2box administrator for {centre_id}:") # noqa
        wis2box_email = input()
        print("The email address of the wis2box administrator will be set to:") # noqa
        print(f"    {wis2box_email}")
        print("Is this correct? (y/n/exit)")
        answer = input()

    # ask for the name of the centre
    answer = ""

    while answer != "y":
        if answer == "exit":
            exit()
        print(f"Please enter the name of the organization for {centre_id}:")
        centre_name = input()
        print("The organization name will be set to:")
        print(f"    {centre_name}")
        print("Is this correct? (y/n/exit)")
        answer = input()

    # get an initial bounding box for the country
    country_name, bounding_box = get_bounding_box(country_code)

    create_metadata_file(
        host_datadir,
        country_name,
        centre_id,
        centre_name,
        wis2box_email,
        bounding_box,
        template="synop"
    )
    create_metadata_file(
        host_datadir,
        country_name,
        centre_id,
        centre_name,
        wis2box_email,
        bounding_box,
        template="temp"
    )

    print("*" * 80)
    print(f"Metadata files for {centre_id} created in directory {host_datadir}.") # noqa
    print("Please review the files and edit where necessary.")
    print("*" * 80)


def create_station_list(host_datadir: str) -> None:
    """
    creates the station list file in the directory host_datadir

    :param host_datadir: `str` of path to directory where configuration files
                       are to be stored

    :returns: None
    """

    station_metadata_dir = Path(host_datadir) / 'metadata' / 'station'
    # create directory for station metadata if it does not exist
    if not station_metadata_dir.exists():
        station_metadata_dir.mkdir(parents=True)

    station_list = station_metadata_dir / 'station_list.csv'
    headers = 'station_name,wigos_station_identifier,traditional_station_identifier,facility_type,latitude,longitude,elevation,barometer_height,territory_name,wmo_region' # noqa
    with station_list.open("w") as fh2:
        fh2.write(headers)


def get_host_datadir() -> str:
    """
    reads the value of WIS2BOX_HOST_DATADIR from wis2box.env

    returns: `str` of path for WIS2BOX_HOST_DATADIR
    """

    host_datadir = None

    with Path("wis2box.env").open() as fh:
        lines = fh.readlines()

        for line in lines:
            if "WIS2BOX_HOST_DATADIR" in line:
                host_datadir = line.split("=")[1].strip()

        if not host_datadir:
            print("WARNING:")
            print("The file wis2box.env does not contain the variable WIS2BOX_HOST_DATADIR.") # noqa
            print("Please edit the file and add the variable WIS2BOX_HOST_DATADIR.") # noqa
            print("Or remove wis2box.env and run 'python3 wis2box-create-config.py' again.") # noqa
            exit()

    return host_datadir


def main():
    """
    mainline function

    creates the wis2box.env file
    and sets up the directory for WIS2BOX_HOST_DATADIR
    """

    host_datadir = None
    dev_env = Path("wis2box.env")

    # check if wis2box.env exists
    # if it does, read the value for WIS2BOX_HOST_DATADIR
    # or give the user the option to recreate wis2box.env
    if dev_env.is_file():
        print("The file wis2box.env already exists in the current directory.")
        print("Do you want to recreate wis2box.env? (y/n/exit)")
        answer = input()

        if answer == "y":
            os.remove("wis2box.env")
        elif answer == "exit":
            exit()
        else:
            host_datadir = get_host_datadir()

    # if host_datadir is not defined
    if not host_datadir:
        host_datadir = create_host_datadir()

    create_station_list(host_datadir)

    # if wis2box.env does not exist
    # create it and write host_datadir as the value for WIS2BOX_HOST_DATADIR to wis2box.env # noqa
    if not dev_env.is_file():
        create_wis2box_env(host_datadir)

    print("The configuration is complete.")
    exit()


if __name__ == "__main__":
    main()