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"""
Support for Tomcat

This module uses the manager webapp to manage Apache tomcat webapps.
If the manager webapp is not configured some of the functions won't work.

:configuration:
    - Java bin path should be in default path
    - If ipv6 is enabled make sure you permit manager access to ipv6 interface
      "0:0:0:0:0:0:0:1"
    - If you are using tomcat.tar.gz it has to be installed or symlinked under
      ``/opt``, preferably using name tomcat
    - "tomcat.signal start/stop" works but it does not use the startup scripts

The following grains/pillar should be set:

.. code-block:: yaml

    tomcat-manager:
      user: <username>
      passwd: <password>

or the old format:

.. code-block:: yaml

    tomcat-manager.user: <username>
    tomcat-manager.passwd: <password>

Also configure a user in the conf/tomcat-users.xml file:

.. code-block:: xml

    <?xml version='1.0' encoding='utf-8'?>
    <tomcat-users>
        <role rolename="manager-script"/>
        <user username="tomcat" password="tomcat" roles="manager-script"/>
    </tomcat-users>

.. note::

   - More information about tomcat manager:
     http://tomcat.apache.org/tomcat-7.0-doc/manager-howto.html
   - if you use only this module for deployments you've might want to strict
     access to the manager only from localhost for more info:
     http://tomcat.apache.org/tomcat-7.0-doc/manager-howto.html#Configuring_Manager_Application_Access
   - Tested on:

     JVM Vendor:
         Sun Microsystems Inc.
     JVM Version:
         1.6.0_43-b01
     OS Architecture:
         amd64
     OS Name:
         Linux
     OS Version:
         2.6.32-358.el6.x86_64
     Tomcat Version:
         Apache Tomcat/7.0.37
"""

import glob
import hashlib
import logging
import os
import re
import tempfile
import urllib.parse
import urllib.request

import salt.utils.data
import salt.utils.stringutils

log = logging.getLogger(__name__)

__func_alias__ = {"reload_": "reload"}

# Support old-style grains/pillar
# config as well as new.
__valid_configs = {
    "user": ["tomcat-manager.user", "tomcat-manager:user"],
    "passwd": ["tomcat-manager.passwd", "tomcat-manager:passwd"],
}


def __virtual__():
    """
    Only load tomcat if it is installed or if grains/pillar config exists
    """
    if __catalina_home() or _auth("dummy"):
        return "tomcat"
    return (
        False,
        "Tomcat execution module not loaded: neither Tomcat installed locally nor"
        " tomcat-manager credentials set in grains/pillar/config.",
    )


def __catalina_home():
    """
    Tomcat paths differ depending on packaging
    """
    locations = ["/usr/share/tomcat*", "/opt/tomcat"]
    for location in locations:
        folders = glob.glob(location)
        if folders:
            for catalina_home in folders:
                if os.path.isdir(catalina_home + "/bin"):
                    return catalina_home
    return False


def _get_credentials():
    """
    Get the username and password from opts, grains, or pillar
    """
    ret = {"user": False, "passwd": False}

    # Loop through opts, grains, and pillar
    # Return the first acceptable configuration found
    for item in ret:
        for struct in [__opts__, __grains__, __pillar__]:
            # Look for the config key
            # Support old-style config format and new
            for config_key in __valid_configs[item]:
                value = salt.utils.data.traverse_dict_and_list(struct, config_key, None)
                if value:
                    ret[item] = value
                    break
    return ret["user"], ret["passwd"]


def _auth(uri):
    """
    returns a authentication handler.
    Get user & password from grains, if are not set default to
    modules.config.option

    If user & pass are missing return False
    """

    user, password = _get_credentials()
    if user is False or password is False:
        return False

    basic = urllib.request.HTTPBasicAuthHandler()
    basic.add_password(
        realm="Tomcat Manager Application", uri=uri, user=user, passwd=password
    )
    digest = urllib.request.HTTPDigestAuthHandler()
    digest.add_password(
        realm="Tomcat Manager Application", uri=uri, user=user, passwd=password
    )
    return urllib.request.build_opener(basic, digest)


def extract_war_version(war):
    """
    Extract the version from the war file name. There does not seem to be a
    standard for encoding the version into the `war file name`_

    .. _`war file name`: https://tomcat.apache.org/tomcat-6.0-doc/deployer-howto.html

    Examples:

    .. code-block:: bash

        /path/salt-2015.8.6.war -> 2015.8.6
        /path/V6R2013xD5.war -> None
    """
    basename = os.path.basename(war)
    war_package = os.path.splitext(basename)[0]  # remove '.war'
    version = re.findall("-([\\d.-]+)$", war_package)  # try semver
    return version[0] if version and len(version) == 1 else None  # default to none


def _wget(cmd, opts=None, url="http://localhost:8080/manager", timeout=180):
    """
    A private function used to issue the command to tomcat via the manager
    webapp

    cmd
        the command to execute

    url
        The URL of the server manager webapp (example:
        http://localhost:8080/manager)

    opts
        a dict of arguments

    timeout
        timeout for HTTP request

    Return value is a dict in the from of::

        {
            res: [True|False]
            msg: list of lines we got back from the manager
        }
    """

    ret = {"res": True, "msg": []}

    # prepare authentication
    auth = _auth(url)
    if auth is False:
        ret["res"] = False
        ret["msg"] = "missing username and password settings (grain/pillar)"
        return ret

    # prepare URL
    if url[-1] != "/":
        url += "/"
    url6 = url
    url += f"text/{cmd}"
    url6 += f"{cmd}"
    if opts:
        url += f"?{urllib.parse.urlencode(opts)}"
        url6 += f"?{urllib.parse.urlencode(opts)}"

    # Make the HTTP request
    urllib.request.install_opener(auth)

    try:
        # Trying tomcat >= 7 url
        ret["msg"] = urllib.request.urlopen(url, timeout=timeout).read().splitlines()
    except Exception:  # pylint: disable=broad-except
        try:
            # Trying tomcat6 url
            ret["msg"] = (
                urllib.request.urlopen(url6, timeout=timeout).read().splitlines()
            )
        except Exception:  # pylint: disable=broad-except
            ret["msg"] = "Failed to create HTTP request"

    # Force all byte strings to utf-8 strings, for python >= 3.4
    for key, value in enumerate(ret["msg"]):
        try:
            ret["msg"][key] = salt.utils.stringutils.to_unicode(value, "utf-8")
        except (UnicodeDecodeError, AttributeError):
            pass

    if not ret["msg"][0].startswith("OK"):
        ret["res"] = False

    return ret


def _simple_cmd(cmd, app, url="http://localhost:8080/manager", timeout=180):
    """
    Simple command wrapper to commands that need only a path option
    """

    try:
        opts = {"path": app, "version": ls(url)[app]["version"]}
        return "\n".join(_wget(cmd, opts, url, timeout=timeout)["msg"])
    except Exception:  # pylint: disable=broad-except
        return f"FAIL - No context exists for path {app}"


# Functions
def leaks(url="http://localhost:8080/manager", timeout=180):
    """
    Find memory leaks in tomcat

    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.leaks
    """

    return _wget("findleaks", {"statusLine": "true"}, url, timeout=timeout)["msg"]


def status(url="http://localhost:8080/manager", timeout=180):
    """
    Used to test if the tomcat manager is up

    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.status
        salt '*' tomcat.status http://localhost:8080/manager
    """

    return _wget("list", {}, url, timeout=timeout)["res"]


def ls(url="http://localhost:8080/manager", timeout=180):
    """
    list all the deployed webapps

    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.ls
        salt '*' tomcat.ls http://localhost:8080/manager
    """

    ret = {}
    data = _wget("list", "", url, timeout=timeout)
    if data["res"] is False:
        return {}
    data["msg"].pop(0)
    for line in data["msg"]:
        tmp = line.split(":")
        ret[tmp[0]] = {
            "mode": tmp[1],
            "sessions": tmp[2],
            "fullname": tmp[3],
            "version": "",
        }
        sliced = tmp[3].split("##")
        if len(sliced) > 1:
            ret[tmp[0]]["version"] = sliced[1]

    return ret


def stop(app, url="http://localhost:8080/manager", timeout=180):
    """
    Stop the webapp

    app
        the webapp context path
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.stop /jenkins
        salt '*' tomcat.stop /jenkins http://localhost:8080/manager
    """

    return _simple_cmd("stop", app, url, timeout=timeout)


def start(app, url="http://localhost:8080/manager", timeout=180):
    """
    Start the webapp

    app
        the webapp context path
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.start /jenkins
        salt '*' tomcat.start /jenkins http://localhost:8080/manager
    """

    return _simple_cmd("start", app, url, timeout=timeout)


def reload_(app, url="http://localhost:8080/manager", timeout=180):
    """
    Reload the webapp

    app
        the webapp context path
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.reload /jenkins
        salt '*' tomcat.reload /jenkins http://localhost:8080/manager
    """

    return _simple_cmd("reload", app, url, timeout=timeout)


def sessions(app, url="http://localhost:8080/manager", timeout=180):
    """
    return the status of the webapp sessions

    app
        the webapp context path
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.sessions /jenkins
        salt '*' tomcat.sessions /jenkins http://localhost:8080/manager
    """

    return _simple_cmd("sessions", app, url, timeout=timeout)


def status_webapp(app, url="http://localhost:8080/manager", timeout=180):
    """
    return the status of the webapp (stopped | running | missing)

    app
        the webapp context path
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.status_webapp /jenkins
        salt '*' tomcat.status_webapp /jenkins http://localhost:8080/manager
    """

    webapps = ls(url, timeout=timeout)
    for i in webapps:
        if i == app:
            return webapps[i]["mode"]

    return "missing"


def serverinfo(url="http://localhost:8080/manager", timeout=180):
    """
    return details about the server

    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.serverinfo
        salt '*' tomcat.serverinfo http://localhost:8080/manager
    """

    data = _wget("serverinfo", {}, url, timeout=timeout)
    if data["res"] is False:
        return {"error": data["msg"]}

    ret = {}
    data["msg"].pop(0)
    for line in data["msg"]:
        tmp = line.split(":")
        ret[tmp[0].strip()] = tmp[1].strip()

    return ret


def undeploy(app, url="http://localhost:8080/manager", timeout=180):
    """
    Undeploy a webapp

    app
        the webapp context path
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    timeout : 180
        timeout for HTTP request

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.undeploy /jenkins
        salt '*' tomcat.undeploy /jenkins http://localhost:8080/manager
    """

    return _simple_cmd("undeploy", app, url, timeout=timeout)


def deploy_war(
    war,
    context,
    force="no",
    url="http://localhost:8080/manager",
    saltenv="base",
    timeout=180,
    temp_war_location=None,
    version=True,
):
    """
    Deploy a WAR file

    war
        absolute path to WAR file (should be accessible by the user running
        tomcat) or a path supported by the salt.modules.cp.get_file function
    context
        the context path to deploy
    force : False
        set True to deploy the webapp even one is deployed in the context
    url : http://localhost:8080/manager
        the URL of the server manager webapp
    saltenv : base
        the environment for WAR file in used by salt.modules.cp.get_url
        function
    timeout : 180
        timeout for HTTP request
    temp_war_location : None
        use another location to temporarily copy to war file
        by default the system's temp directory is used
    version : ''
        Specify the war version.  If this argument is provided, it overrides
        the version encoded in the war file name, if one is present.

        Examples:

        .. code-block:: bash

            salt '*' tomcat.deploy_war salt://salt-2015.8.6.war version=2015.08.r6

        .. versionadded:: 2015.8.6

    CLI Examples:

    cp module

    .. code-block:: bash

        salt '*' tomcat.deploy_war salt://application.war /api
        salt '*' tomcat.deploy_war salt://application.war /api no
        salt '*' tomcat.deploy_war salt://application.war /api yes http://localhost:8080/manager

    minion local file system

    .. code-block:: bash

        salt '*' tomcat.deploy_war /tmp/application.war /api
        salt '*' tomcat.deploy_war /tmp/application.war /api no
        salt '*' tomcat.deploy_war /tmp/application.war /api yes http://localhost:8080/manager
    """
    # Decide the location to copy the war for the deployment
    tfile = f"salt.{os.path.basename(war)}"
    if temp_war_location is not None:
        if not os.path.isdir(temp_war_location):
            return f'Error - "{temp_war_location}" is not a directory'
        tfile = os.path.join(temp_war_location, tfile)
    else:
        tfile = os.path.join(tempfile.gettempdir(), tfile)

    # Copy file name if needed
    cache = False
    if not os.path.isfile(war):
        cache = True
        cached = __salt__["cp.get_url"](war, tfile, saltenv)
        if not cached:
            return "FAIL - could not cache the WAR file"
        try:
            __salt__["file.set_mode"](cached, "0644")
        except KeyError:
            pass
    else:
        tfile = war

    # Prepare options
    opts = {
        "war": f"file:{tfile}",
        "path": context,
    }

    # If parallel versions are desired or not disabled
    if version:
        # Set it to defined version or attempt extract
        version = extract_war_version(war) if version is True else version

        if isinstance(version, str):
            # Only pass version to Tomcat if not undefined
            opts["version"] = version

    if force == "yes":
        opts["update"] = "true"

    # Deploy
    deployed = _wget("deploy", opts, url, timeout=timeout)
    res = "\n".join(deployed["msg"])

    # Cleanup
    if cache:
        __salt__["file.remove"](tfile)

    return res


def passwd(passwd, user="", alg="sha1", realm=None):
    """
    This function replaces the $CATALINA_HOME/bin/digest.sh script
    convert a clear-text password to the $CATALINA_BASE/conf/tomcat-users.xml
    format

    CLI Examples:

    .. code-block:: bash

        salt '*' tomcat.passwd secret
        salt '*' tomcat.passwd secret tomcat sha1
        salt '*' tomcat.passwd secret tomcat sha1 'Protected Realm'
    """
    # pylint: disable=no-value-for-parameter
    # we call the first parameter the same as the function!

    # Shouldn't it be SHA265 instead of SHA1?
    digest = getattr(hashlib, alg, None)
    if digest is not None:
        if realm:
            digest.update(f"{user}:{realm}:{passwd}")
        else:
            digest.update(passwd)

    return digest and digest.hexdigest() or False


# Non-Manager functions
def version():
    """
    Return server version from catalina.sh version

    CLI Example:

    .. code-block:: bash

        salt '*' tomcat.version
    """
    cmd = __catalina_home() + "/bin/catalina.sh version"
    out = __salt__["cmd.run"](cmd).splitlines()
    for line in out:
        if not line:
            continue
        if "Server version" in line:
            comps = line.split(": ")
            return comps[1]


def fullversion():
    """
    Return all server information from catalina.sh version

    CLI Example:

    .. code-block:: bash

        salt '*' tomcat.fullversion
    """
    cmd = __catalina_home() + "/bin/catalina.sh version"
    ret = {}
    out = __salt__["cmd.run"](cmd).splitlines()
    for line in out:
        if not line:
            continue
        if ": " in line:
            comps = line.split(": ")
            ret[comps[0]] = comps[1].lstrip()
    return ret


def signal(signal=None):
    """
    Signals catalina to start, stop, securestart, forcestop.

    CLI Example:

    .. code-block:: bash

        salt '*' tomcat.signal start
    """
    valid_signals = {
        "forcestop": "stop -force",
        "securestart": "start -security",
        "start": "start",
        "stop": "stop",
    }

    if signal not in valid_signals:
        return

    cmd = f"{__catalina_home()}/bin/catalina.sh {valid_signals[signal]}"
    __salt__["cmd.run"](cmd)


if __name__ == "__main__":
    # Allow testing from the CLI
    __opts__ = {}
    __grains__ = {}
    __pillar__ = {
        "tomcat-manager.user": "foobar",
        "tomcat-manager.passwd": "barfoo1!",
    }

    old_format_creds = _get_credentials()

    __pillar__ = {"tomcat-manager": {"user": "foobar", "passwd": "barfoo1!"}}

    new_format_creds = _get_credentials()

    if old_format_creds == new_format_creds:
        log.info("Config backwards compatible")
    else:
        log.ifno("Config not backwards compatible")