simple-login/app/dashboard/views/custom_domain.py

from flask import render_template, request, redirect, url_for, flash
from flask_login import login_required, current_user
from flask_wtf import FlaskForm
from wtforms import StringField, validators

from app.config import EMAIL_SERVERS_WITH_PRIORITY
from app.dashboard.base import dashboard_bp
from app.email_utils import get_email_domain_part
from app.extensions import db
from app.models import CustomDomain


# todo: add more validation
class NewCustomDomainForm(FlaskForm):
    domain = StringField("domain", validators=[validators.DataRequired()])


@dashboard_bp.route("/custom_domain", methods=["GET", "POST"])
@login_required
def custom_domain():
    custom_domains = CustomDomain.query.filter_by(user_id=current_user.id).all()

    new_custom_domain_form = NewCustomDomainForm()

    errors = {}

    if request.method == "POST":
        if request.form.get("form-name") == "create":
            if not current_user.is_premium():
                flash("Only premium plan can add custom domain", "warning")
                return redirect(url_for("dashboard.custom_domain"))

            if new_custom_domain_form.validate():
                new_domain = new_custom_domain_form.domain.data.lower().strip()
                if CustomDomain.get_by(domain=new_domain):
                    flash(f"{new_domain} already added", "warning")
                elif get_email_domain_part(current_user.email) == new_domain:
                    flash(
                        "You cannot add a domain that you are currently using for your personal email. "
                        "Please change your personal email to your real email",
                        "error",
                    )
                else:
                    new_custom_domain = CustomDomain.create(
                        domain=new_domain, user_id=current_user.id
                    )
                    db.session.commit()

                    flash(
                        f"New domain {new_custom_domain.domain} is created", "success"
                    )

                    return redirect(
                        url_for(
                            "dashboard.domain_detail_dns",
                            custom_domain_id=new_custom_domain.id,
                        )
                    )

    return render_template(
        "dashboard/custom_domain.html",
        custom_domains=custom_domains,
        new_custom_domain_form=new_custom_domain_form,
        EMAIL_SERVERS_WITH_PRIORITY=EMAIL_SERVERS_WITH_PRIORITY,
        errors=errors,
    )