jsldjf

from flask import Flask, request, render_template
import string

app = Flask(__name__)

app.config['DEBUG'] = True

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

@app.route('/', methods=['POST'])
def validate_form():
    username = request.form['username']
    password = request.form['password']
    verified_password = request.form['verify']
    email = request.form['email']
    invalidChars = set(' ')
    validChars = set('@, .')
    username_content = ""
    email_content = ""
    errors_present = False


    # Here we will check the validity of the username. It cannot contain spaces, be empty, be less than 3 character or longer than 20 characters.
    if any(char in invalidChars for char in username) or  len(username)<3 or  len(username)>20:
        username_error_msg = "That is not a valid username"
        username_content = ""
        errors_present = True
    else:
        username_error_msg = ""
        username_content = username


    # Here we validate the password. It follows the same rules as the username.
    if any(char in invalidChars for char in password) or  len(password)<3 or  len(password)>20:
        password_error_msg = "That is not a valid password"
        errors_present = True
    else:
        password_error_msg = ""

    # Here we validate the 'verify password' field. If it does not match the passowrd it throws an error
    ver_pass_err_stat = verified_password != password
    if ver_pass_err_stat == True:
        verify_error_msg = "Passwords do not match"
        errors_present = True
    else:
        verify_error_msg = ""

    # Here we validate the email. It can be left blank but if it does contain characters we check to see if it is a valid email by looking for the @ symbol and '.' character
    if email != "":
        if any(char not in validChar for char in email):
            email_error_msg = "That is not a valid email address"
            email_content = ""
            errors_present = True
        else:
            email_error_msg = ""
            email_content = email
    else:
        email_error_msg = ""
        email_content = email

    # If there are any errors present it will rerender the form with a blanket display of any present errors. If there are no errors present then it will render the 'Welcome' template instead.
    if errors_present == True:
        return render_template('index.html',
        username = username_content,
        username_error = username_error_msg,
        password_error = password_error_msg,
        verify_error = verify_error_msg,
        email = email_content,
        email_error = email_error_msg
        )
    else:
        render_template('welcome.html', new_user = username)



app.run()