Add user email verification

configs/development.py

@@ -20,6 +20,16 @@ SQLALCHEMY_TRACK_MODIFICATIONS = True
 ### DATABASE - SQLite
 SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'pdns.db')
 
+### SMTP config
+# MAIL_SERVER = 'localhost'
+# MAIL_PORT = 25
+# MAIL_DEBUG = False
+# MAIL_USE_TLS = False
+# MAIL_USE_SSL = False
+# MAIL_USERNAME = None
+# MAIL_PASSWORD = None
+# MAIL_DEFAULT_SENDER = ('PowerDNS-Admin', 'noreply@domain.ltd')
+
 # SAML Authnetication
 SAML_ENABLED = False
 # SAML_DEBUG = True

configs/docker_config.py

@@ -1,6 +1,6 @@
 # Defaults for Docker image
-BIND_ADDRESS='0.0.0.0'
-PORT=80
+BIND_ADDRESS = '0.0.0.0'
+PORT = 80
 
 legal_envvars = (
     'SECRET_KEY',
@@ -10,6 +10,14 @@ legal_envvars = (
     'SALT',
     'SQLALCHEMY_TRACK_MODIFICATIONS',
     'SQLALCHEMY_DATABASE_URI',
+    'MAIL_SERVER',
+    'MAIL_PORT',
+    'MAIL_DEBUG',
+    'MAIL_USE_TLS',
+    'MAIL_USE_SSL',
+    'MAIL_USERNAME',
+    'MAIL_PASSWORD',
+    'MAIL_DEFAULT_SENDER',
     'SAML_ENABLED',
     'SAML_DEBUG',
     'SAML_PATH',
@@ -37,14 +45,14 @@ legal_envvars = (
     'SAML_LOGOUT_URL',
 )
 
-legal_envvars_int = (
-    'PORT',
-    'SAML_METADATA_CACHE_LIFETIME',
-)
+legal_envvars_int = ('PORT', 'MAIL_PORT', 'SAML_METADATA_CACHE_LIFETIME')
 
 legal_envvars_bool = (
     'SQLALCHEMY_TRACK_MODIFICATIONS',
     'HSTS_ENABLED',
+    'MAIL_DEBUG',
+    'MAIL_USE_TLS',
+    'MAIL_USE_SSL',
     'SAML_ENABLED',
     'SAML_DEBUG',
     'SAML_SIGN_REQUEST',

migrations/versions/3f76448bb6de_add_user_confirmed_column.py

@@ -0,0 +1,28 @@
+"""Add user.confirmed column
+
+Revision ID: 3f76448bb6de
+Revises: b0fea72a3f20
+Create Date: 2019-12-21 17:11:36.564632
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '3f76448bb6de'
+down_revision = 'b0fea72a3f20'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('user', sa.Column('confirmed', sa.Boolean(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('user', 'confirmed')
+    # ### end Alembic commands ###

powerdnsadmin/__init__.py

@@ -2,6 +2,7 @@ import os
 import logging
 from flask import Flask
 from flask_seasurf import SeaSurf
+from flask_mail import Mail
 from werkzeug.middleware.proxy_fix import ProxyFix
 
 from .lib import utils
@@ -64,6 +65,9 @@ def create_app(config=None):
         from flask_sslify import SSLify
         _sslify = SSLify(app)  # lgtm [py/unused-local-variable]
 
+    # SMTP
+    app.mail = Mail(app)
+
     # Load app's components
     assets.init_app(app)
     models.init_app(app)

powerdnsadmin/decorators.py

@@ -4,7 +4,7 @@ from functools import wraps
 from flask import g, request, abort, current_app, render_template
 from flask_login import current_user
 
-from .models import User, ApiKey, Setting, Domain
+from .models import User, ApiKey, Setting, Domain, Setting
 from .lib.errors import RequestIsNotJSON, NotEnoughPrivileges
 from .lib.errors import DomainAccessForbidden
 
@@ -121,6 +121,12 @@ def api_basic_auth(f):
                         plain_text_password=password)
 
             try:
+                if Setting().get('verify_user_email') and user.email and not user.confirmed:
+                    current_app.logger.warning(
+                        'Basic authentication failed for user {} because of unverified email address'
+                        .format(username))
+                    abort(401)
+
                 auth_method = request.args.get('auth_method', 'LOCAL')
                 auth_method = 'LDAP' if auth_method != 'LOCAL' else 'LOCAL'
                 auth = user.is_validate(method=auth_method,

powerdnsadmin/models/setting.py

@@ -25,6 +25,7 @@ class Setting(db.Model):
         'allow_user_create_domain': False,
         'bg_domain_updates': False,
         'site_name': 'PowerDNS-Admin',
+        'site_url': 'http://localhost:9191',
         'session_timeout': 10,
         'warn_session_timeout': True,
         'pdns_api_url': '',
@@ -33,6 +34,7 @@ class Setting(db.Model):
         'pdns_version': '4.1.1',
         'local_db_enabled': True,
         'signup_enabled': True,
+        'verify_user_email': False,
         'ldap_enabled': False,
         'ldap_type': 'ldap',
         'ldap_uri': '',

powerdnsadmin/models/user.py

@@ -26,6 +26,7 @@ class User(db.Model):
     lastname = db.Column(db.String(64))
     email = db.Column(db.String(128))
     otp_secret = db.Column(db.String(16))
+    confirmed = db.Column(db.Boolean, default=False)
     role_id = db.Column(db.Integer, db.ForeignKey('role.id'))
 
     def __init__(self,
@@ -38,6 +39,7 @@ class User(db.Model):
                  role_id=None,
                  email=None,
                  otp_secret=None,
+                 confirmed=False,
                  reload_info=True):
         self.id = id
         self.username = username
@@ -48,6 +50,7 @@ class User(db.Model):
         self.role_id = role_id
         self.email = email
         self.otp_secret = otp_secret
+        self.confirmed = confirmed
 
         if reload_info:
             user_info = self.get_user_info_by_id(
@@ -61,6 +64,7 @@ class User(db.Model):
                 self.email = user_info.email
                 self.role_id = user_info.role_id
                 self.otp_secret = user_info.otp_secret
+                self.confirmed = user_info.confirmed
 
     def is_authenticated(self):
         return True
@@ -524,6 +528,13 @@ class User(db.Model):
             db.session.rollback()
             return False
 
+    def update_confirmed(self, confirmed):
+        """
+        Update user email confirmation status
+        """
+        self.confirmed = confirmed
+        db.session.commit()
+
     def get_domains(self):
         """
         Get list of domains which the user is granted to have

powerdnsadmin/routes/admin.py

@@ -501,7 +501,7 @@ def setting_basic():
             'pretty_ipv6_ptr', 'dnssec_admins_only',
             'allow_user_create_domain', 'bg_domain_updates', 'site_name',
             'session_timeout', 'warn_session_timeout', 'ttl_options',
-            'pdns_api_timeout'
+            'pdns_api_timeout', 'verify_user_email'
         ]
 
         return render_template('admin_setting_basic.html', settings=settings)

powerdnsadmin/routes/index.py

@@ -29,6 +29,8 @@ from ..services.github import github_oauth
 from ..services.azure import azure_oauth
 from ..services.oidc import oidc_oauth
 from ..services.saml import SAML
+from ..services.token import confirm_token
+from ..services.email import send_account_verification
 
 google = None
 github = None
@@ -280,6 +282,12 @@ def login():
                     plain_text_password=password)
 
         try:
+            if Setting().get('verify_user_email') and user.email and not user.confirmed:
+                return render_template(
+                    'login.html',
+                    saml_enabled=SAML_ENABLED,
+                    error='Please confirm your email address first')
+
             auth = user.is_validate(method=auth_method,
                                     src_ip=request.remote_addr)
             if auth == False:
@@ -411,6 +419,8 @@ def register():
             try:
                 result = user.create_local_user()
                 if result and result['status']:
+                    if Setting().get('verify_user_email'):
+                        send_account_verification(email)
                     return redirect(url_for('index.login'))
                 else:
                     return render_template('register.html',
@@ -421,6 +431,50 @@ def register():
         return render_template('errors/404.html'), 404
 
 
+@index_bp.route('/confirm/<token>', methods=['GET'])
+def confirm_email(token):
+    email = confirm_token(token)
+    if not email:
+        # Cannot confirm email
+        return render_template('email_confirmation.html', status=0)
+
+    user = User.query.filter_by(email=email).first_or_404()
+    if user.confirmed:
+        # Already confirmed
+        current_app.logger.info(
+            "User email {} already confirmed".format(email))
+        return render_template('email_confirmation.html', status=2)
+    else:
+        # Confirm email is valid
+        user.update_confirmed(confirmed=True)
+        current_app.logger.info(
+            "User email {} confirmed successfully".format(email))
+        return render_template('email_confirmation.html', status=1)
+
+
+@index_bp.route('/resend-confirmation-email', methods=['GET', 'POST'])
+def resend_confirmation_email():
+    if current_user.is_authenticated:
+        return redirect(url_for('index.index'))
+    if request.method == 'GET':
+        return render_template('resend_confirmation_email.html')
+    elif request.method == 'POST':
+        email = request.form.get('email')
+        user = User.query.filter(User.email == email).first()
+        if not user:
+            # Email not found
+            status = 0
+        elif user.confirmed:
+            # Email already confirmed
+            status = 1
+        else:
+            # Send new confirmed email
+            send_account_verification(user.email)
+            status = 2
+
+        return render_template('resend_confirmation_email.html', status=status)
+
+
 @index_bp.route('/nic/checkip.html', methods=['GET', 'POST'])
 def dyndns_checkip():
     # This route covers the default ddclient 'web' setting for the checkip service

powerdnsadmin/services/email.py

@@ -0,0 +1,27 @@
+import traceback
+from flask_mail import Message
+from flask import current_app, render_template, url_for
+
+from .token import generate_confirmation_token
+from ..models.setting import Setting
+
+
+def send_account_verification(user_email):
+    """
+    Send welcome message for the new registration
+    """
+    try:
+        token = generate_confirmation_token(user_email)
+        verification_link = url_for('index.confirm_email', token=token, _external=True)
+
+        subject = "Welcome to {}".format(Setting().get('site_name'))
+        msg = Message(subject=subject)
+        msg.recipients = [user_email]
+        msg.body = "Please access the following link verify your email address. {}".format(
+            verification_link)
+        msg.html = render_template('emails/account_verification.html',
+                                verification_link=verification_link)
+        current_app.mail.send(msg)
+    except Exception as e:
+        current_app.logger.error("Cannot send account verification email. Error: {}".format(e))
+        current_app.logger.debug(traceback.format_exc())

powerdnsadmin/services/token.py

@@ -0,0 +1,18 @@
+from flask import current_app
+from itsdangerous import URLSafeTimedSerializer
+
+
+def generate_confirmation_token(email):
+    serializer = URLSafeTimedSerializer(current_app.config['SECRET_KEY'])
+    return serializer.dumps(email, salt=current_app.config['SALT'])
+
+
+def confirm_token(token, expiration=86400):
+    serializer = URLSafeTimedSerializer(current_app.config['SECRET_KEY'])
+    try:
+        email = serializer.loads(token,
+                                 salt=current_app.config['SALT'],
+                                 max_age=expiration)
+    except:
+        return False
+    return email

powerdnsadmin/templates/base.html

@@ -177,7 +177,7 @@
 {% block scripts %}
 {% assets "js_main" -%}
   <script type="text/javascript" src="{{ ASSET_URL }}"></script>
-  {% if SETTING.get('warn_session_timeout') %}
+  {% if SETTING.get('warn_session_timeout') and current_user.is_authenticated %}
   <script>
     // close the session warning popup when receive
     // a boradcast message

powerdnsadmin/templates/email_confirmation.html

@@ -0,0 +1,40 @@
+{% extends "base.html" %}
+{% block title %}<title>Email verification - {{ SITE_NAME }}</title>{% endblock %}
+
+{% block dashboard_stat %}
+{% endblock %}
+
+{% block content %}
+<!-- Main content -->
+<section class="content">
+    <div class="error-page">
+        <div class="error-content">
+            {% if status == 1 %}
+            <h3>
+                <i class="fa fa-thumbs-o-up text-success"></i> Email verification successful!
+            </h3>
+            <p>
+              You have confirmed your account. <a href="{{ url_for('index.login') }}">Click here</a> to login.
+            </p>
+            {% elif status == 2 %}
+            <h3>
+              <i class="fa fa-hand-stop-o text-info"></i> Already verified!
+            </h3>
+            <p>
+              You have confirmed your account already. <a href="{{ url_for('index.login') }}">Click here</a> to login.
+            </p>
+            {% else %}
+            <h3>
+              <i class="fa fa-warning text-yellow"></i> Email verification failed!
+            </h3>
+            <p>
+              The confirmation link is invalid or has expired. <a href="{{ url_for('index.resend_confirmation_email') }}">Click here</a> if you want to resend a new link.
+            </p>
+            {% endif %}
+        </div>
+        <!-- /.error-content -->
+    </div>
+    <!-- /.error-page -->
+</section>
+<!-- /.content -->
+{% endblock %}

powerdnsadmin/templates/emails/account_verification.html

@@ -0,0 +1,219 @@
+<!doctype html>
+<html>
+
+<head>
+    <meta name="viewport" content="width=device-width">
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+    <title>{{ SITE_NAME }} user verification email</title>
+    <style>
+        @media only screen and (max-width: 620px) {
+            table[class=body] h1 {
+                font-size: 28px !important;
+                margin-bottom: 10px !important;
+            }
+
+            table[class=body] p,
+            table[class=body] ul,
+            table[class=body] ol,
+            table[class=body] td,
+            table[class=body] span,
+            table[class=body] a {
+                font-size: 16px !important;
+            }
+
+            table[class=body] .wrapper,
+            table[class=body] .article {
+                padding: 10px !important;
+            }
+
+            table[class=body] .content {
+                padding: 0 !important;
+            }
+
+            table[class=body] .container {
+                padding: 0 !important;
+                width: 100% !important;
+            }
+
+            table[class=body] .main {
+                border-left-width: 0 !important;
+                border-radius: 0 !important;
+                border-right-width: 0 !important;
+            }
+
+            table[class=body] .btn table {
+                width: 100% !important;
+            }
+
+            table[class=body] .btn a {
+                width: 100% !important;
+            }
+
+            table[class=body] .img-responsive {
+                height: auto !important;
+                max-width: 100% !important;
+                width: auto !important;
+            }
+        }
+
+        @media all {
+            .ExternalClass {
+                width: 100%;
+            }
+
+            .ExternalClass,
+            .ExternalClass p,
+            .ExternalClass span,
+            .ExternalClass font,
+            .ExternalClass td,
+            .ExternalClass div {
+                line-height: 100%;
+            }
+
+            .apple-link a {
+                color: inherit !important;
+                font-family: inherit !important;
+                font-size: inherit !important;
+                font-weight: inherit !important;
+                line-height: inherit !important;
+                text-decoration: none !important;
+            }
+
+            #MessageViewBody a {
+                color: inherit;
+                text-decoration: none;
+                font-size: inherit;
+                font-family: inherit;
+                font-weight: inherit;
+                line-height: inherit;
+            }
+
+            .btn-primary table td:hover {
+                background-color: #34495e !important;
+            }
+
+            .btn-primary a:hover {
+                background-color: #34495e !important;
+                border-color: #34495e !important;
+            }
+        }
+    </style>
+</head>
+
+<body class=""
+    style="background-color: #f6f6f6; font-family: sans-serif; -webkit-font-smoothing: antialiased; font-size: 14px; line-height: 1.4; margin: 0; padding: 0; -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%;">
+    <span class="preheader"
+        style="color: transparent; display: none; height: 0; max-height: 0; max-width: 0; opacity: 0; overflow: hidden; mso-hide: all; visibility: hidden; width: 0;">This
+        is preheader text. Some clients will show this text as a preview.</span>
+    <table role="presentation" border="0" cellpadding="0" cellspacing="0" class="body"
+        style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; background-color: #f6f6f6; width: 100%;"
+        width="100%" bgcolor="#f6f6f6">
+        <tr>
+            <td style="font-family: sans-serif; font-size: 14px; vertical-align: top;" valign="top">&nbsp;</td>
+            <td class="container"
+                style="font-family: sans-serif; font-size: 14px; vertical-align: top; display: block; max-width: 580px; padding: 10px; width: 580px; margin: 0 auto;"
+                width="580" valign="top">
+                <div class="content"
+                    style="box-sizing: border-box; display: block; margin: 0 auto; max-width: 580px; padding: 10px;">
+
+                    <!-- START CENTERED WHITE CONTAINER -->
+                    <table role="presentation" class="main"
+                        style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; background: #ffffff; border-radius: 3px; width: 100%;"
+                        width="100%">
+
+                        <!-- START MAIN CONTENT AREA -->
+                        <tr>
+                            <td class="wrapper"
+                                style="font-family: sans-serif; font-size: 14px; vertical-align: top; box-sizing: border-box; padding: 20px;"
+                                valign="top">
+                                <table role="presentation" border="0" cellpadding="0" cellspacing="0"
+                                    style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%;"
+                                    width="100%">
+                                    <tr>
+                                        <td style="font-family: sans-serif; font-size: 14px; vertical-align: top;"
+                                            valign="top">
+                                            <p
+                                                style="font-family: sans-serif; font-size: 14px; font-weight: normal; margin: 0; margin-bottom: 15px;">
+                                                Hello!</p>
+                                            <p
+                                                style="font-family: sans-serif; font-size: 14px; font-weight: normal; margin: 0; margin-bottom: 15px;">
+                                                Please click the button below to verify your email address.</p>
+                                            <table role="presentation" border="0" cellpadding="0" cellspacing="0"
+                                                class="btn btn-primary"
+                                                style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; box-sizing: border-box; width: 100%;"
+                                                width="100%">
+                                                <tbody>
+                                                    <tr>
+                                                        <td align="left"
+                                                            style="font-family: sans-serif; font-size: 14px; vertical-align: top; padding-bottom: 15px;"
+                                                            valign="top">
+                                                            <table role="presentation" border="0" cellpadding="0"
+                                                                cellspacing="0"
+                                                                style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: auto;">
+                                                                <tbody>
+                                                                    <tr>
+                                                                        <td style="font-family: sans-serif; font-size: 14px; vertical-align: top; border-radius: 5px; text-align: center; background-color: #3498db;"
+                                                                            valign="top" align="center"
+                                                                            bgcolor="#3498db"> <a
+                                                                                href="{{ verification_link }}"
+                                                                                target="_blank"
+                                                                                style="border: solid 1px #3498db; border-radius: 5px; box-sizing: border-box; cursor: pointer; display: inline-block; font-size: 14px; font-weight: bold; margin: 0; padding: 12px 25px; text-decoration: none; text-transform: capitalize; background-color: #3498db; border-color: #3498db; color: #ffffff;">Verify
+                                                                                Email Address</a> </td>
+                                                                    </tr>
+                                                                </tbody>
+                                                            </table>
+                                                        </td>
+                                                    </tr>
+                                                </tbody>
+                                            </table>
+                                            <p
+                                                style="font-family: sans-serif; font-size: 14px; font-weight: normal; margin: 0; margin-bottom: 15px;">
+                                                Your confirmation link will be expired in 24 hours. If you did not create an account, no further action is required.</p>
+                                            <p
+                                                style="font-family: sans-serif; font-size: 14px; font-weight: normal; margin: 0; margin-bottom: 15px;">
+                                                Cheers!</p>
+                                        </td>
+                                    </tr>
+                                </table>
+                            </td>
+                        </tr>
+
+                        <!-- END MAIN CONTENT AREA -->
+                    </table>
+                    <!-- END CENTERED WHITE CONTAINER -->
+
+                    <!-- START FOOTER -->
+                    <div class="footer" style="clear: both; margin-top: 10px; text-align: center; width: 100%;">
+                        <table role="presentation" border="0" cellpadding="0" cellspacing="0"
+                            style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%;"
+                            width="100%">
+                            <tr>
+                                <td class="content-block"
+                                    style="font-family: sans-serif; vertical-align: top; padding-bottom: 10px; padding-top: 10px; color: #999999; font-size: 12px; text-align: center;"
+                                    valign="top" align="center">
+                                    <span class="apple-link"
+                                        style="color: #999999; font-size: 12px; text-align: center;">This email was sent
+                                        from <a href="{{ SETTING.get('site_url') }}"
+                                            target="_blank">{{ SITE_NAME }}</a></span>
+                                </td>
+                            </tr>
+                            <tr>
+                                <td class="content-block powered-by"
+                                    style="font-family: sans-serif; vertical-align: top; padding-bottom: 10px; padding-top: 10px; color: #999999; font-size: 12px; text-align: center;"
+                                    valign="top" align="center">
+                                    Powered by <a href="https://github.com/ngoduykhanh/PowerDNS-Admin"
+                                        style="color: #999999; font-size: 12px; text-align: center; text-decoration: none;">PowerDNS-Admin</a>.
+                                </td>
+                            </tr>
+                        </table>
+                    </div>
+                    <!-- END FOOTER -->
+
+                </div>
+            </td>
+            <td style="font-family: sans-serif; font-size: 14px; vertical-align: top;" valign="top">&nbsp;</td>
+        </tr>
+    </table>
+</body>
+
+</html>

powerdnsadmin/templates/login.html

@@ -120,6 +120,10 @@
       {% if SETTING.get('signup_enabled') %}
       <br>
       <a href="{{ url_for('index.register') }}" class="text-center">Create an account </a>
+        {% if SETTING.get('verify_user_email') %}
+          <br/>
+          <a href="{{ url_for('index.resend_confirmation_email') }}" class="text-center">Resend confirmation email</a>
+        {% endif %}
       {% endif %}
     </div>
     <!-- /.login-box-body -->

powerdnsadmin/templates/register.html

@@ -48,8 +48,7 @@
         </div>
         <div class="form-group has-feedback">
           <input type="email" class="form-control" placeholder="Email" name="email"
-            data-error="Please input your valid email address"
-            pattern="^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$" required>
+            data-error="Please input your valid email address" required>
           <span class="glyphicon glyphicon-envelope form-control-feedback"></span>
           <span class="help-block with-errors"></span>
         </div>

powerdnsadmin/templates/resend_confirmation_email.html

@@ -0,0 +1,44 @@
+{% extends "base.html" %}
+{% block title %}<title>Resend confirmation email - {{ SITE_NAME }}</title>{% endblock %}
+
+{% block dashboard_stat %}
+{% endblock %}
+
+{% block content %}
+<!-- Main content -->
+<section class="content">
+    <div class="error-page">
+        <div class="error-content">
+          <h3>
+            <i class="fa fa-hand-o-right text-info"></i> Resend a confirmation email
+          </h3>
+          <p>
+            Enter your email address to get new account confirmation link.
+          </p>
+          <form class="search-form" method="post">
+            <div class="input-group">
+              <input type="hidden" name="_csrf_token" value="{{ csrf_token() }}">
+              <input type="text" name="email" class="form-control" placeholder="Email address" data-error="Please input your email" required>
+              <div class="input-group-btn">
+                <button type="submit" name="submit" class="btn btn-success btn-flat"><i class="fa fa-mail-reply"></i>
+                </button>
+              </div>
+            </div>
+            <!-- /.input-group -->
+            <p>
+              {% if status == 0 %}
+                <font color="red">Email not found!</font>
+              {% elif status == 1 %}
+                <font color="red">Email already confirmed!</font>
+              {% elif status == 2 %}
+                <font color="green">Confirmation email sent!</font>
+              {% endif %}
+            </p>
+          </form>
+        </div>
+        <!-- /.error-content -->
+    </div>
+    <!-- /.error-page -->
+</section>
+<!-- /.content -->
+{% endblock %}

requirements.txt

@@ -26,3 +26,4 @@ pytest==5.0.1
 pytimeparse==1.1.8
 PyYAML==5.1.1
 Flask-SSLify==0.1.5
+Flask-Mail==0.9.1