Login using python Flask with MongoDB and Blueprint

In this post, I will present how I used it, it is not necessarily the best approach
I tried to make it as simple as possible ;)

Assumption:

• You know Flask, python and MongoDB.
• You know how what blueprint is in Flask terminology.
• You know how to user forms

in example_bp.py:

#your imports here

from flask import Flask, Blueprint, request, render_template, session, redirect, url_for

from wtforms import TextField,PasswordField

from flask.ext.pymongo import MongoClient

from flask.ext.wtf import Form,RecaptchaField

import sys

from wtforms.validators import DataRequired, Email

from wtforms.validators import *

from flask.ext.login import LoginManager, login_user, logout_user, current_user, login_required

from flask.ext.login import UserMixin

from functools import wraps

from datetime import datetime, timedelta

from flask.ext import admin

import json

from flask.json import jsonify

mongo_host = 'localhost'

mongo_port = 27017

example_database_name = 'expl'

example_blue_print = Blueprint('examlpe_bluep',__name__) 

login_manager = LoginManager() 

login_manager.login_view = 'example_login'

client = MongoClient(mongo_host,mongo_port) 

db = client[example_database_name]

class User(UserMixin):

  username = ""

  password = ""

  def get_id(self):

    return db.example_users.find_one({'ex_username': self.username})['_id']

#This is used instead of login_manager.init_app(app)               

#Since this is a blueprint   

@example_blue_print.record_once                                             

def on_load(state):                                                

  login_manager.init_app(state.app)  

@login_manager.user_loader

def load_user(userid):

  user_record = db.users.find_one({'_id': userid})

  user = User()

  user.username = user_rec['username']

  user.password = user_rec['password']

  return user

@example_blue_print.route('/login',methods=['POST','GET'])

def login():

  if request.method == 'POST':

    form = loginForm(request.form)

    user_record = form.validate_and_get_user_record()

    if user_record != None:

      user = User()

      user.username = user_record['username']

      user.password = user_record['password']

      login_user(user,False)

      return 'Login successful'

      

  else:

    form = loginForm()

  return render_template('login.html',form=form)

##end of example_bp.by

to run this you need another python file (below)

## let us call it flask_main_example.py

from flask import Flask, request, Blueprint, render_template

from pymongo import MongoClient

from example_bp import example_blue_print

from flask.ext.login import LoginManager

app = Flask(__name__)

#I'm not sure the if the below 2 lines are needed, but I'm lazy to find out :D

login_manager = LoginManager()

login_manager.init_app(app)

#list blueprints below

app.register_blueprint(example_blue_print)

if __name__== '__main__':

  app.run()

#end of the file

in the terminal try to run it as:

python example_bp.by

I hope guys you like it ;)

Please let me know if you have an problems with that :)

Resources:

• Flask official website.
• Mongo official website.
• python official website.
• Other websites (sorry, I do not remember them :D)