#!/usr/bin/env python3
"""
Delete an IAM User from an AWS Account.

Copyright (c) 2019 TKalus <tkalus@users.noreply.github.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

SOURCE: https://gist.github.com/tkalus/e91c1d2d68bff68e9c6fa2b8ab2f5485
"""

import logging
import sys

import boto3.session
import botocore.exceptions

logger = logging.getLogger(__file__)


def delete_iam_user(session: boto3.session.Session, user_name: str) -> None:
    """For a given boto3.session.Session, delete the IAM User and all assoc'd resources."""
    iam = session.resource("iam")
    iam_client = session.client("iam")
    user = iam.User(user_name)
    try:
        user.load()
    except botocore.exceptions.ClientError as err:
        # If load failed with NoSuchEntity, IAM User doesn't exist.
        if err.response.get("Error", {}).get("Code", "") == "NoSuchEntity":
            logger.error(f"User {user_name} does not exist")
            return
        raise err
    logger.debug(f"Deleting IAM User: {user.arn}")
    for group in user.groups.all():
        logger.debug(f"Removing {user.arn} from Group {group.arn}")
        user.remove_group(GroupName=group.name)
    try:
        login_profile = iam.LoginProfile(user.name)
        login_profile.load()
        logger.debug(f"Deleting Login Profile (I.E. Password) from {user.arn}")
        login_profile.delete()
    except botocore.exceptions.ClientError as err:
        # If load failed with NoSuchEntity, No Login Profile
        if err.response.get("Error", {}).get("Code", "") != "NoSuchEntity":
            raise err
    for device in user.mfa_devices.all():
        logger.debug(f"Removing MFA Device from {user.arn}: {device.serial_number}")
        device.disassociate()
    for access_key in user.access_keys.all():
        logger.debug(f"Deleting Access Key from {user.arn}: {access_key.access_key_id}")
        access_key.delete()
    for policy in user.policies.all():
        logger.debug(f"Deleting Inline Policy from {user.arn}: {policy.name}")
        policy.delete()
    for policy in user.attached_policies.all():
        logger.debug(f"Detatching Managed Policy from {user.arn}: {policy.arn}")
        user.detach_policy(PolicyArn=policy.arn)
    for cert in user.signing_certificates.all():
        logger.debug(f"Deleting Signing Cert from {user.arn}: {cert.id}")
        iam_client.delete_signing_certificate(UserName=user.name, CertificateId=cert.id)
    for ssh_public_key_id in [
        key.get("SSHPublicKeyId", "")
        for key in iam_client.list_ssh_public_keys(UserName=user.name).get(
            "SSHPublicKeys", []
        )
    ]:
        logger.debug(f"Deleting SSH Public Key from {user.arn}: {ssh_public_key_id}")
        iam_client.delete_ssh_public_key(
            UserName=user.name, SSHPublicKeyId=ssh_public_key_id
        )
    for service_name, service_specific_credential_id in {
        cred.get("ServiceName", ""): cred.get("ServiceSpecificCredentialId", "")
        for cred in iam_client.list_service_specific_credentials(
            UserName=user.name
        ).get("ServiceSpecificCredentials", [])
    }.items():
        logger.debug(
            f"Deleting Service Specific Cred from {user.arn}:"
            f" {service_name}:{service_specific_credential_id}"
        )
        iam_client.delete_service_specific_credential(
            UserName=user.name,
            ServiceSpecificCredentialId=service_specific_credential_id,
        )
    logger.info(f"Deleted IAM user: {user.name}")
    user.delete()


if __name__ == "__main__":
    logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
    logging.getLogger("boto3").setLevel(logging.ERROR)
    logging.getLogger("botocore").setLevel(logging.ERROR)
    logging.getLogger("urllib3").setLevel(logging.ERROR)
    session = boto3.session.Session()
    user_name = dict(enumerate(sys.argv)).get(1)
    if user_name:
        delete_iam_user(session, user_name)