Flask-Hashids

Hashids integration for Flask applications, it is based on the Hashid package available on PyPi. With this extension you can conveniently use integer ids for your application logic or database tables and hash them before exposing it in URLs or JSON data.

Installation

The latest stable version is available on PyPI. Either add Flask-Hashids to your requirements.txt file or install with pip:

pip install Flask-Hashids

Configuration

Flask-Hashids is configured through the standard Flask config API. These are the available options:

• HASHIDS_ALPHABET: Read more about that in Hashids documentation
• HASHIDS_MIN_LENGTH: Read more about that in Hashids documentation
• SECRET_KEY: Used as the salt, read more in Hashids documentation

Examples

from flask import abort, Flask, render_template, url_for
from flask_hashids import HashidMixin, Hashids
from flask_sqlalchemy import SQLAlchemy


app = Flask(__name__)
# The SECRET_KEY is used as a salt, so don't forget to set this in production
app.config['SECRET_KEY'] = 'secret!'
db = SQLAlchemy(app)
hashids = Hashids(app)


class User(HashidMixin, db.Model):
    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), nullable=False)


@app.route('/users')
def users():
    hashid_users = [
      {
        'id': user.hashid,  # hashid property from HashidMixin
        'name': user.name,
        'url': url_for('user', user_id=user.id)  # Int id for url generation
      } for user in User.query.all()
    ]
    return render_template('users.html', users=hashid_users)


@app.route('/users/<hashid:user_id>')
def user(user_id):
    # The HashidConverter decodes the given hashid to an int
    user = User.query.get_or_404(user_id):
    return render_template('user.html', user=user)


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

Ressources

• https://hashids.org/python/