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# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

"""Puppet: Install, configure and start puppet"""

import os
import socket
from io import StringIO
from logging import Logger
from textwrap import dedent

import yaml

from cloudinit import helpers, subp, temp_utils, url_helper, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.distros import ALL_DISTROS, Distro
from cloudinit.settings import PER_INSTANCE

AIO_INSTALL_URL = "https://raw.githubusercontent.com/puppetlabs/install-puppet/main/install.sh"  # noqa: E501
PUPPET_AGENT_DEFAULT_ARGS = ["--test"]
PUPPET_PACKAGE_NAMES = ("puppet-agent", "puppet")

MODULE_DESCRIPTION = """\
This module handles puppet installation and configuration. If the ``puppet``
key does not exist in global configuration, no action will be taken. If a
config entry for ``puppet`` is present, then by default the latest version of
puppet will be installed. If the ``puppet`` config key exists in the config
archive, this module will attempt to start puppet even if no installation was
performed.

The module also provides keys for configuring the new puppet 4 paths and
installing the puppet package from the puppetlabs repositories:
https://docs.puppet.com/puppet/4.2/reference/whered_it_go.html
The keys are ``package_name``, ``conf_file``, ``ssl_dir`` and
``csr_attributes_path``. If unset, their values will default to
ones that work with puppet 3.x and with distributions that ship modified
puppet 4.x that uses the old paths.
"""

meta: MetaSchema = {
    "id": "cc_puppet",
    "name": "Puppet",
    "title": "Install, configure and start puppet",
    "description": MODULE_DESCRIPTION,
    "distros": [ALL_DISTROS],
    "frequency": PER_INSTANCE,
    "examples": [
        dedent(
            """\
            puppet:
                install: true
                version: "7.7.0"
                install_type: "aio"
                collection: "puppet7"
                aio_install_url: 'https://git.io/JBhoQ'
                cleanup: true
                conf_file: "/etc/puppet/puppet.conf"
                ssl_dir: "/var/lib/puppet/ssl"
                csr_attributes_path: "/etc/puppet/csr_attributes.yaml"
                exec: true
                exec_args: ['--test']
                conf:
                    agent:
                        server: "puppetserver.example.org"
                        certname: "%i.%f"
                    ca_cert: |
                        -----BEGIN CERTIFICATE-----
                        MIICCTCCAXKgAwIBAgIBATANBgkqhkiG9w0BAQUFADANMQswCQYDVQQDDAJjYTAe
                        Fw0xMDAyMTUxNzI5MjFaFw0xNTAyMTQxNzI5MjFaMA0xCzAJBgNVBAMMAmNhMIGf
                        MA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCu7Q40sm47/E1Pf+r8AYb/V/FWGPgc
                        b014OmNoX7dgCxTDvps/h8Vw555PdAFsW5+QhsGr31IJNI3kSYprFQcYf7A8tNWu
                        1MASW2CfaEiOEi9F1R3R4Qlz4ix+iNoHiUDTjazw/tZwEdxaQXQVLwgTGRwVa+aA
                        qbutJKi93MILLwIDAQABo3kwdzA4BglghkgBhvhCAQ0EKxYpUHVwcGV0IFJ1Ynkv
                        T3BlblNTTCBHZW5lcmF0ZWQgQ2VydGlmaWNhdGUwDwYDVR0TAQH/BAUwAwEB/zAd
                        BgNVHQ4EFgQUu4+jHB+GYE5Vxo+ol1OAhevspjAwCwYDVR0PBAQDAgEGMA0GCSqG
                        SIb3DQEBBQUAA4GBAH/rxlUIjwNb3n7TXJcDJ6MMHUlwjr03BDJXKb34Ulndkpaf
                        +GAlzPXWa7bO908M9I8RnPfvtKnteLbvgTK+h+zX1XCty+S2EQWk29i2AdoqOTxb
                        hppiGMp0tT5Havu4aceCXiy2crVcudj3NFciy8X66SoECemW9UYDCb9T5D0d
                        -----END CERTIFICATE-----
                csr_attributes:
                    custom_attributes:
                        1.2.840.113549.1.9.7: 342thbjkt82094y0uthhor289jnqthpc2290
                    extension_requests:
                        pp_uuid: ED803750-E3C7-44F5-BB08-41A04433FE2E
                        pp_image_name: my_ami_image
                        pp_preshared_key: 342thbjkt82094y0uthhor289jnqthpc2290
            """  # noqa: E501
        ),
        dedent(
            """\
            puppet:
                install_type: "packages"
                package_name: "puppet"
                exec: false
            """
        ),
    ],
    "activate_by_schema_keys": ["puppet"],
}

__doc__ = get_meta_doc(meta)


class PuppetConstants:
    def __init__(
        self, puppet_conf_file, puppet_ssl_dir, csr_attributes_path, log
    ):
        self.conf_path = puppet_conf_file
        self.ssl_dir = puppet_ssl_dir
        self.ssl_cert_dir = os.path.join(puppet_ssl_dir, "certs")
        self.ssl_cert_path = os.path.join(self.ssl_cert_dir, "ca.pem")
        self.csr_attributes_path = csr_attributes_path


def _manage_puppet_services(log, cloud: Cloud, action: str):
    """Attempts to perform action on one of the puppet services"""
    service_managed: str = ""
    for puppet_name in PUPPET_PACKAGE_NAMES:
        try:
            cloud.distro.manage_service(action, f"{puppet_name}.service")
            service_managed = puppet_name
            break
        except subp.ProcessExecutionError:
            pass
    if not service_managed:
        log.warning(
            "Could not '%s' any of the following services: %s",
            action,
            ", ".join(PUPPET_PACKAGE_NAMES),
        )


def get_config_value(puppet_bin, setting):
    """Get the config value for a given setting using `puppet config print`
    :param puppet_bin: path to puppet binary
    :param setting: setting to query
    """
    out, _ = subp.subp([puppet_bin, "config", "print", setting])
    return out.rstrip()


def install_puppet_aio(
    distro: Distro,
    url=AIO_INSTALL_URL,
    version=None,
    collection=None,
    cleanup=True,
):
    """Install puppet-agent from the puppetlabs repositories using the one-shot
    shell script

    :param distro: Instance of Distro
    :param url: URL from where to download the install script
    :param version: version to install, blank defaults to latest
    :param collection: collection to install, blank defaults to latest
    :param cleanup: whether to purge the puppetlabs repo after installation
    """
    args = []
    if version is not None:
        args = ["-v", version]
    if collection is not None:
        args += ["-c", collection]

    # Purge puppetlabs repos after installation
    if cleanup:
        args += ["--cleanup"]
    content = url_helper.readurl(url=url, retries=5).contents

    # Use tmpdir over tmpfile to avoid 'text file busy' on execute
    with temp_utils.tempdir(
        dir=distro.get_tmp_exec_path(), needs_exe=True
    ) as tmpd:
        tmpf = os.path.join(tmpd, "puppet-install")
        util.write_file(tmpf, content, mode=0o700)
        return subp.subp([tmpf] + args, capture=False)


def handle(
    name: str, cfg: Config, cloud: Cloud, log: Logger, args: list
) -> None:
    # If there isn't a puppet key in the configuration don't do anything
    if "puppet" not in cfg:
        log.debug(
            "Skipping module named %s, no 'puppet' configuration found", name
        )
        return

    puppet_cfg = cfg["puppet"]
    # Start by installing the puppet package if necessary...
    install = util.get_cfg_option_bool(puppet_cfg, "install", True)
    version = util.get_cfg_option_str(puppet_cfg, "version", None)
    collection = util.get_cfg_option_str(puppet_cfg, "collection", None)
    install_type = util.get_cfg_option_str(
        puppet_cfg, "install_type", "packages"
    )
    cleanup = util.get_cfg_option_bool(puppet_cfg, "cleanup", True)
    run = util.get_cfg_option_bool(puppet_cfg, "exec", default=False)
    start_puppetd = util.get_cfg_option_bool(
        puppet_cfg, "start_service", default=True
    )
    aio_install_url = util.get_cfg_option_str(
        puppet_cfg, "aio_install_url", default=AIO_INSTALL_URL
    )

    # AIO and distro packages use different paths
    if install_type == "aio":
        puppet_user = "root"
        puppet_bin = "/opt/puppetlabs/bin/puppet"
        puppet_package = "puppet-agent"
    else:  # default to 'packages'
        puppet_user = "puppet"
        puppet_bin = "puppet"
        puppet_package = None  # changes with distro

    package_name = util.get_cfg_option_str(
        puppet_cfg, "package_name", puppet_package
    )
    if not install and version:
        log.warning(
            "Puppet install set to false but version supplied, doing nothing."
        )
    elif install:
        log.debug(
            "Attempting to install puppet %s from %s",
            version if version else "latest",
            install_type,
        )

        if install_type == "packages":
            if package_name is None:  # conf has no package_nam
                for puppet_name in PUPPET_PACKAGE_NAMES:
                    try:
                        cloud.distro.install_packages((puppet_name, version))
                        package_name = puppet_name
                        break
                    except subp.ProcessExecutionError:
                        pass
                if not package_name:
                    log.warning(
                        "No installable puppet package in any of: %s",
                        ", ".join(PUPPET_PACKAGE_NAMES),
                    )
            else:
                cloud.distro.install_packages((package_name, version))

        elif install_type == "aio":
            install_puppet_aio(
                cloud.distro, aio_install_url, version, collection, cleanup
            )
        else:
            log.warning("Unknown puppet install type '%s'", install_type)
            run = False

    conf_file = util.get_cfg_option_str(
        puppet_cfg, "conf_file", get_config_value(puppet_bin, "config")
    )
    ssl_dir = util.get_cfg_option_str(
        puppet_cfg, "ssl_dir", get_config_value(puppet_bin, "ssldir")
    )
    csr_attributes_path = util.get_cfg_option_str(
        puppet_cfg,
        "csr_attributes_path",
        get_config_value(puppet_bin, "csr_attributes"),
    )

    p_constants = PuppetConstants(conf_file, ssl_dir, csr_attributes_path, log)

    # ... and then update the puppet configuration
    if "conf" in puppet_cfg:
        # Add all sections from the conf object to puppet.conf
        contents = util.load_file(p_constants.conf_path)
        # Create object for reading puppet.conf values
        puppet_config = helpers.DefaultingConfigParser()
        # Read puppet.conf values from original file in order to be able to
        # mix the rest up. First clean them up
        # (TODO(harlowja) is this really needed??)
        cleaned_lines = [i.lstrip() for i in contents.splitlines()]
        cleaned_contents = "\n".join(cleaned_lines)
        puppet_config.read_file(
            StringIO(cleaned_contents), source=p_constants.conf_path
        )
        for (cfg_name, cfg) in puppet_cfg["conf"].items():
            # Cert configuration is a special case
            # Dump the puppetserver ca certificate in the correct place
            if cfg_name == "ca_cert":
                # Puppet ssl sub-directory isn't created yet
                # Create it with the proper permissions and ownership
                util.ensure_dir(p_constants.ssl_dir, 0o771)
                util.chownbyname(p_constants.ssl_dir, puppet_user, "root")
                util.ensure_dir(p_constants.ssl_cert_dir)

                util.chownbyname(p_constants.ssl_cert_dir, puppet_user, "root")
                util.write_file(p_constants.ssl_cert_path, cfg)
                util.chownbyname(
                    p_constants.ssl_cert_path, puppet_user, "root"
                )
            else:
                # Iterate through the config items, we'll use ConfigParser.set
                # to overwrite or create new items as needed
                for (o, v) in cfg.items():
                    if o == "certname":
                        # Expand %f as the fqdn
                        # TODO(harlowja) should this use the cloud fqdn??
                        v = v.replace("%f", socket.getfqdn())
                        # Expand %i as the instance id
                        v = v.replace("%i", cloud.get_instance_id())
                        # certname needs to be downcased
                        v = v.lower()
                    puppet_config.set(cfg_name, o, v)
            # We got all our config as wanted we'll rename
            # the previous puppet.conf and create our new one
            util.rename(
                p_constants.conf_path, "%s.old" % (p_constants.conf_path)
            )
            util.write_file(p_constants.conf_path, puppet_config.stringify())

    if "csr_attributes" in puppet_cfg:
        util.write_file(
            p_constants.csr_attributes_path,
            yaml.dump(puppet_cfg["csr_attributes"], default_flow_style=False),
        )

    if start_puppetd:
        # Enables the services
        _manage_puppet_services(log, cloud, "enable")

    # Run the agent if needed
    if run:
        log.debug("Running puppet-agent")
        cmd = [puppet_bin, "agent"]
        if "exec_args" in puppet_cfg:
            cmd_args = puppet_cfg["exec_args"]
            if isinstance(cmd_args, (list, tuple)):
                cmd.extend(cmd_args)
            elif isinstance(cmd_args, str):
                cmd.extend(cmd_args.split())
            else:
                log.warning(
                    "Unknown type %s provided for puppet"
                    " 'exec_args' expected list, tuple,"
                    " or string",
                    type(cmd_args),
                )
                cmd.extend(PUPPET_AGENT_DEFAULT_ARGS)
        else:
            cmd.extend(PUPPET_AGENT_DEFAULT_ARGS)
        subp.subp(cmd, capture=False)

    if start_puppetd:
        # Start puppetd
        _manage_puppet_services(log, cloud, "start")


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