#!/opt/imunify360/venv/bin/python3

import base64
import subprocess
import json
import os
import time
import fileinput
import socket
import select
import shutil
import random
import string
import sys
from urllib.parse import urlencode

# this code is duplicated in installation.py because execute.py file is
# copied into /usr/bin directory in .spec. To handle it we can:
# 1. Create package in /opt/alt, but:
#     1.1 In plesk extension case python38 is installed after this code
# 2. Save code in var/etc directories and use symlinks technique, but:
#     2.1 Again, plesk extension
#     2.2 Symlinks may be disabled in the system
#         (so endusers will not be able to use extension)
#     2.3 This directories are not intended for such usage
#         (var is even deletable)
# 3. Store this files in new place in each extension
#     3.1 There are 4 extensions * 2 os types
# also present in installation.py


class Status:
    INSTALLING = "installing"
    UPGRADING = "upgrading"
    OK = "running"
    NOT_INSTALLED = "not_installed"
    FAILED_TO_INSTALL = "failed_to_install"
    STOPPED = "stopped"
    SOCKET_INACCESSIBLE = "socket_inaccessible"


class ImunifyPluginDeployScript:
    IMUNIFY_360 = "i360deploy.sh"
    IMUNIFY_AV = "imav-deploy.sh"


def get_status():
    if is_in_upgrade_process():
        return Status.UPGRADING

    proc = subprocess.Popen(["ps", "ax"], stdout=subprocess.PIPE)
    output = proc.stdout.read().decode()
    is_i360_running = ImunifyPluginDeployScript.IMUNIFY_360 in output
    is_imav_running = ImunifyPluginDeployScript.IMUNIFY_AV in output
    if is_i360_running or is_imav_running:
        return Status.INSTALLING
    else:
        sock = None
        try:
            sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
            sock.connect("/var/run/defence360agent/simple_rpc.sock")
            return Status.OK
        except PermissionError:
            return Status.SOCKET_INACCESSIBLE
        except Exception:
            if os.path.exists("/usr/bin/imunify360-agent"):
                return Status.STOPPED
            else:
                try:
                    if os.path.exists(
                        "/usr/local/psa/var/modules/"
                        "imunify360/installation.log"
                    ):
                        return Status.FAILED_TO_INSTALL
                except:  # noqa
                    pass
                return Status.NOT_INSTALLED
        finally:
            if sock is not None:
                sock.close()


SOCKET_PATH_ROOT = "/var/run/defence360agent/simple_rpc.sock"
SOCKET_PATH_USER = "/var/run/defence360agent/non_root_simple_rpc.sock"
UPGRADE_MARKER_FILE = "/var/imunify360/upgrade_process_started"


class ExecuteError(Exception):
    def __str__(self):
        return "ExecuteError: " + super(ExecuteError, self).__str__()


def is_in_upgrade_process():
    return os.path.isfile(UPGRADE_MARKER_FILE)


def execute(command):
    if is_in_upgrade_process():
        handle_upgrading(command)
        return

    socket_path = SOCKET_PATH_ROOT if os.getegid() == 0 else SOCKET_PATH_USER

    try:
        with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
            sock.connect(socket_path)
            sock.sendall(str.encode(command) + b"\n")

            fd_list = [sock.fileno()]
            rwx_list = select.select(fd_list, [], [], 180)

            if sock.fileno() not in rwx_list[0]:
                raise Exception("Request timeout")

            response = sock.makefile(encoding="utf-8").readline()
            if not response:
                raise Exception("Empty response from socket")

            print(response)
    except (ConnectionRefusedError, FileNotFoundError, PermissionError):
        print_response()


def print_response(resp_data=None, resp_status=get_status(), result="error"):
    print(
        json.dumps(
            dict(
                result=result,
                messages=[],
                data=resp_data,
                status=resp_status,
            )
        )
    )


def _get_chunk(offset, limit):
    try:
        with open("/var/log/i360deploy.log", "r") as f:
            f.seek(offset)
            for i in range(10):
                chunk = f.read(limit)
                if chunk == "":
                    time.sleep(1)
                else:
                    return chunk
    except (IOError, OSError, ValueError):
        return "Error reading file i360deploy.log"
    return ""


def print_upgrading_status(offset, limit):
    chunk = _get_chunk(offset, limit)
    resp_data = dict(
        items=dict(
            log=chunk,
            offset=offset + len(chunk),
        )
    )
    print_response(
        resp_data,
        resp_status=Status.UPGRADING,
        result="success",
    )


def handle_upgrading(command):
    request = json.loads(command)

    if request.get("command") == ["upgrading", "status"]:
        params = request.get("params")
        print_upgrading_status(params["offset"], params["limit"])
    else:
        print_response(resp_status=get_status(), result="error")


def upload_file(params):
    params = json.loads(params)
    upload_path = "/var/imunify360/uploads"
    uploaded = []

    for tmp_path, file_name in params.get("files", {}).items():
        file_name = file_name.encode("utf-8")
        path = os.path.join(bytes(upload_path, "utf-8"), file_name)
        shutil.move(tmp_path.encode("utf-8"), path)
        os.chown(path, 0, 0)
        os.chmod(path, 0o600)
        uploaded.append(path)

    random_name = "".join(
        random.choice(string.ascii_uppercase + string.digits) for _ in range(8)
    )
    zip_file = random_name + ".zip"
    zip_path = os.path.join("/var/imunify360/uploads", zip_file)
    subprocess.call(
        ["zip", "-j", "-m", "--password", "1", zip_path] + uploaded,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.STDOUT,
        shell=False,
    )
    os.chown(zip_path, 0, 0)
    os.chmod(zip_path, 0o600)

    result = {
        "result": "success",
        "data": zip_path,
    }

    print(json.dumps(result))


#  Imunify Email

IMUNIFYEMAIL_SOCKET_PATH = "/var/run/imunifyemail/quarantine.sock"

if os.path.exists(IMUNIFYEMAIL_SOCKET_PATH):
    import urllib3.connection

    class HttpUdsConnection(urllib3.connection.HTTPConnection):
        def __init__(self, socket_path, *args, **kw):
            self.socket_path = socket_path
            super().__init__(*args, **kw)

        def connect(self):
            self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
            self.sock.connect(self.socket_path)


def imunifyemail(command):
    command = json.loads(command)
    con = HttpUdsConnection(IMUNIFYEMAIL_SOCKET_PATH, "localhost")
    url = ("/quarantine/api/v1/" + "/".join(command["command"])).format(
        account_name=command["username"]
    )
    try:
        con.request(
            command["params"]["request_method"].upper(),
            url + "?" + urlencode(command["params"], doseq=True),
            body=json.dumps(command["params"]),
        )
    except Exception as e:
        print(
            json.dumps(
                {
                    "messages": str(e),
                    "result": "error",
                }
            )
        )
        return

    data = []
    response = con.getresponse()
    response_text = response.read()
    if response_text:
        response_text = json.loads(response_text) or []
        if "items" in response_text:
            data = response_text
        else:
            data = dict(items=response_text)

    messages = (
        "Something went wrong please try again"
        if response.status != 200
        else ""
    )

    print(
        json.dumps(
            dict(
                result="success" if response.status == 200 else "error",
                messages=messages,
                status=response.status,
                data=data,
            )
        )
    )


if __name__ == "__main__":
    action = sys.argv[1]
    encoded_data = fileinput.input(files=sys.argv[2:]).readline()
    data = base64.b64decode(encoded_data).decode()
    dispatcher = {
        "execute": execute,
        "uploadFile": upload_file,
        "imunifyEmail": imunifyemail,
    }

    try:
        dispatcher.get(action, execute)(data)
    except Exception as e:
        print(
            json.dumps(
                {
                    "messages": str(e),
                    "result": "error",
                }
            )
        )