#!/usr/bin/env python3

import ssl

import smtplib

import imaplib

from rich.console import Console

from cryptography import x509

import tls_utils

from tls_utils import TLSDetails

from abc import ABC, abstractmethod

class MailHandler(ABC):

    def __init__(self, host: str, port: int, context: ssl.SSLContext):

        self.host = host

        self.port = port

        self.context = context

    def connect(self, verification: bool) -> int:

        connection = self.protocol_init(self.host, self.port)

        if verification:

            connection.starttls(**self.protocol_starttls_args())

        else:

            connection.starttls()

        cert = connection.sock.getpeercert()

        self.protocol_close(connection)

        return tls_utils.get_validity_days(cert)[1]

    @abstractmethod

    def protocol_init(self, host, port):

        raise NotImplementedError()

    @abstractmethod

    def protocol_close(self, connection):

        raise NotImplementedError()

    @abstractmethod

    def protocol_starttls_args(self):

        raise NotImplementedError()

    @staticmethod

    def create_handler(protocol: str):

        if protocol == "smtp":

            return SMTPHandler

        elif protocol == "imap":

            return IMAPHandler

        else:

            raise ValueError("Invalid protocol")

class IMAPHandler(MailHandler):

    def protocol_init(self, host, port):

        return imaplib.IMAP4(host, port)

    def protocol_close(self, connection):

        connection.logout()

    def protocol_starttls_args(self):

        return {"ssl_context": self.context}

class SMTPHandler(MailHandler):

    def protocol_init(self, host, port):

        return smtplib.SMTP(host, port)

    def protocol_close(self, connection):

        connection.quit()

    def protocol_starttls_args(self):

        return {"context": self.context}

class MailVerificator:

    def __init__(self, context: ssl.SSLContext):

        self.context = context

    def connect(self, domain: str, port: int, protocol: str) -> TLSDetails:

        mail = MailHandler.create_handler(protocol)(domain, port, self.context)

        try:

            expiry = mail.connect(True)

            return TLSDetails(domain_name=domain, expires_in_days=expiry)

        except ssl.SSLCertVerificationError as e:

            if (e.verify_code == tls_utils.EXPIRED_VERIFY_CODE):

                expiry = mail.connect(False)

                return TLSDetails(domain_name=domain, expires_in_days=expiry)

            else:

                error = "failed verification:", e.verify_message + "."

                return TLSDetails(domain_name=domain, error_message=error)

#!/usr/bin/env python3

from rich.console import Console

import datetime

import math

EXPIRED = 10

REVOKED = 23

SELF_SIGNED = 18

ROOT_NOT_TRUSTED = 19

class TLSDetails:

    domain_name = None

    expires_in_days = None

    error_message = None

    connection_error = False

    def __init__(self, domain_name : str = None, expires_in_days : str = None, error_message : str = None, connection_error : bool = False):

        self.domain_name = domain_name

        self.expires_in_days = expires_in_days

        self.error_message = error_message

        self.connection_error = connection_error

    def print(self, console: Console):

        if self.connection_error:

            console.log("[orange bold underline]" + self.domain_name, self.error_message, style="orange")

        elif self.error_message != None:

            console.log("[red bold underline]" + self.domain_name, self.error_message, style="red")

        elif self.expires_in_days < 0:

            console.log("[red bold underline]" + self.domain_name, "expired", abs(self.expires_in_days), "days ago.", style="red")

        else:

            console.log("[green bold underline]" + self.domain_name, "expires in", self.expires_in_days, "days", style="green")

def get_expiry_timestamps(expiry_timestamp: int, now_timestamp: int = datetime.datetime.now(datetime.UTC).timestamp()) -> tuple[bool, int]:

    seconds_left = expiry_timestamp - now_timestamp

    days_left = math.floor(seconds_left / 86400)

    return (seconds_left >= 0, days_left)

def get_validity_days(cert) -> tuple[bool, int]:

    # Get expiry date

    notAfter = cert['notAfter']

    notAfter_date = datetime.datetime.strptime(notAfter, '%b %d %H:%M:%S %Y %Z')

    # datetime to UNIX time

    notAfter_timestamp = notAfter_date.timestamp()

    expiry = get_expiry_timestamps(notAfter_timestamp)

    return (expiry[0], abs(expiry[1]))