nopaque/app/profile/forms.py

from flask_wtf import FlaskForm
from wtforms import (
    FileField,
    StringField,
    SubmitField,
    TextAreaField,
    ValidationError
)
from wtforms.validators import (
    InputRequired,
    Email,
    Length,
    Regexp
)
from app.models import User
from app.auth import USERNAME_REGEX

class EditProfileSettingsForm(FlaskForm):
    avatar = FileField(
        'Image File'
    )
    email = StringField(
        'E-Mail',
        validators=[InputRequired(), Length(max=254), Email()]
    )
    username = StringField(
        'Username',
        validators=[
            InputRequired(),
            Length(max=64),
            Regexp(
                USERNAME_REGEX,
                message=(
                    'Usernames must have only letters, numbers, dots or '
                    'underscores'
                )
            )
        ]
    )
    full_name = StringField(
        'Full name',
        validators=[Length(max=128)]
    )
    about_me = TextAreaField(
        'About me', 
        validators=[
            Length(max=254)
        ]
    )
    website = StringField(
        'Website',
        validators=[
            Length(max=254)
        ]
    )
    organization = StringField(
        'Organization',
        validators=[
            Length(max=128)
        ]
    )
    location = StringField(
        'Location',
        validators=[
            Length(max=128)
        ]
    )

    submit = SubmitField()

    def __init__(self, user, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.user = user

    def validate_email(self, field):
        if (field.data != self.user.email
                and User.query.filter_by(email=field.data).first()):
            raise ValidationError('Email already registered')

    def validate_username(self, field):
        if (field.data != self.user.username
                and User.query.filter_by(username=field.data).first()):
            raise ValidationError('Username already in use')
   
    def validate_image_file(self, field):
        if not field.data.filename.lower().endswith('.jpg' or '.png' or '.jpeg'):
            raise ValidationError('only .jpg, .png and .jpeg!')