Features

• Generate multiple passwords at once.
• Customizable password length (minimum 8 characters).
• Excludes ambiguous characters (e.g., 0, 1, O, I, l, 5, S, q, g).
• Memory efficient

Implementation Details

To make the development easy and more maintainable creating a modern CLI tool I use spf13/cobra, Cobra framework and keep the dependencies at minimum with crypto/rand for cryptographically secure random number generation and strings.Builder for efficient string construction.

# create a virtualenv, with any tool: poetry, pipenv, virtualenv module, etc 
pip install fastapi uvicorn aiofiles SQLAlchemy psycopg2-binary

project structure

.
├── Dockerfile
├── LICENSE
├── main.py
├── README.md
├── requirements.txt
└── timezone_utils
    ├── database.py
    ├── __init__.py
    ├── models.py
    ├── schemas.py
    └── utils.py

1 directory, 10 files

we define the models, schemas and engine for sqlalchemy and the api in the package timezone_utils

Then inspired on this blog post and the project Timezone boundary builder decided to create a test project using fastapi and postgis to do the timezone lookup using the latitude and longitude.

Logging configuration can be defined on different ways like a dict, ini file, yaml or json somethimes is more flexible to do it on code with python, all depends on the use case.

This small example show how to setup the logging configuration using dictConfig method and how to add an user defined object to the logging filter.

import os
import logging
import socket
from flask import Flask
from logging.config import dictConfig

class ContextFilter(logging.Filter):
    hostname = socket.gethostname()

    def filter(self, record):
        record.hostname = ContextFilter.hostname
        return True

logging_configuration = dict(
    version=1,
    disable_existing_loggers=False,
    formatters={
        "default": {"format": "[%(hostname)s %(asctime)s] %(levelname)s in %(module)s: %(message)s"},
    },
    filters={"hostname_filter": {"()": ContextFilter}},
    handlers={
        "console": {
            "class": "logging.StreamHandler",
            "formatter": "default",
            "filters": ["hostname_filter"],
        }
    },
    root={"handlers": ["console"], "level": os.getenv("LOG_LEVEL", "INFO")},
)

dictConfig(logging_configuration)
app = Flask(__name__)
logger = logging.getLogger(__name__)


@app.route("/")
def home():
    logger.debug("debug message")
    logger.info("info message")
    logger.warning("warning message")
    logger.error("error message")
    logger.critical("critical error message")
    return "Hello World"


if __name__ == "__main__":
    app.run()

The filter hostname_filter use the special key "()" which means that user-defined instantiation is wanted. ContextFilter subclass logging.Filter and overrides the filter method so when key hostname is found it will get his value from the ContextFilter class using socket.gethostname() and the application output will show:

changing the policy can be done via command or setup in permanent way on the selinux config in /etc/selinux/config

for this post i created a small app for test a demo purpose using the [python port of the Google library](https://github.com/daviddrysdale/python- phonenumbers)