[PYTHON] SNS made with Flask Flask (Blueprint, bcrypt)

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This article describes application management with Flask's BluePrint and password encryption with bcrypt.

What is BluePrint

A function to be used when you want to manage the created application by grouping it by unit such as function.

For example, if you want to manage the modules of the personal information management function (site1) and the data inquiry function (site2) separately, you can manage them separately using BluePrint so that even one application looks like an internal management. Can be managed separately as multiple applications.

Basic structure

syntax

1. 1. Create the application you want to manage as a BluePrint object.

from flask import Blueprint, render_template

'''Create a BlurPrint instance'''
mysite1_bp = Blueprint('mysite1', __name__, url_prefix='/site1')

@mysite1_bp.route('/hello')
def hello():
    return render_template('mysite1/hello.html')

2. 2. Register the BluePrint object in your application with init.py.

from flask import Flask

def create_app():
    app = Flask(__name__)
    from flaskr.mysite1.views import mysite1_bp
    from flaskr.mysite2.views import mysite2_bp

    app.register_blueprint(mysite1_bp)
    app.register_blueprint(mysite2_bp)
    return app

3. 3. Get the application information defined in init.py in setup.py and start the application.

from flaskr import create_app
from flask import render_template

app = create_app()  # __init__.Get from app

@app.route('/')
def home():
    return render_template('home.html')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=True)

Password encryption (bcrypt)

Encrypt passwords using Flask-Bcrypt.

:At the time of inport, "flask"_Note that "bcrypt" and the word feeling are underscore
>>> from flask_bcrypt import Bcrypt

:Creating a bcrypt object
>>> bcrypt = Bcrypt()
>>> testpass = 'password'

:Password hashing
>>> hashed_password = bcrypt.generate_password_hash(password=testpass)
>>> hashed_password
b'$2b$12$3B0I.CHMIEya1OdyI/m44Od7I.TKhRLiOA.EMMWQP3MgUXgr9dkYG'

:Correct / incorrect comparison with hashed password
>>> bcrypt.check_password_hash(hashed_password, 'password')
True
>>> bcrypt.check_password_hash(hashed_password, 'pass')
False

sample

from flask_bcrypt import generate_password_hash, check_password_hash

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

    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(64), unique=True, index=True)
    username = db.Column(db.String(64), index=True)
    password = db.Column(db.String(128))

    def __init__(self, email, username, password):
        self.email = email
        self.username = username

        #Encrypt the password value passed from the form and store it in a variable.
        self.password = generate_password_hash(password)

    def validate_password(self, password):

        #Compare if the password passed to the function is correct.
        return check_password_hash(self.password, password)