import os
import json
import jinja2
import traceback
import pyqrcode
import base64

from functools import wraps
from flask_login import login_user, logout_user, current_user, login_required
from flask import Flask, g, request, make_response, jsonify, render_template, session, redirect, url_for, send_from_directory
from werkzeug import secure_filename

from lib import utils
from app import app, login_manager
from .models import User, Role, Domain, DomainUser, Record, Server, History, Anonymous, Setting, DomainSetting

from io import BytesIO
from distutils.util import strtobool
from distutils.version import StrictVersion
from optparse import Values

jinja2.filters.FILTERS['display_record_name'] = utils.display_record_name
jinja2.filters.FILTERS['display_master_name'] = utils.display_master_name
jinja2.filters.FILTERS['display_second_to_time'] = utils.display_time

# Flag for pdns v4.x.x
# TODO: Find another way to do this
PDNS_VERSION = app.config['PDNS_VERSION']
if StrictVersion(PDNS_VERSION) >= StrictVersion('4.0.0'):
    NEW_SCHEMA = True
else:
    NEW_SCHEMA = False

@app.context_processor
def inject_fullscreen_layout_setting():
    fullscreen_layout_setting = Setting.query.filter(Setting.name == 'fullscreen_layout').first()
    return dict(fullscreen_layout_setting=strtobool(fullscreen_layout_setting.value))

@app.context_processor
def inject_record_helper_setting():
    record_helper_setting = Setting.query.filter(Setting.name == 'record_helper').first()
    return dict(record_helper_setting=strtobool(record_helper_setting.value))

@app.context_processor
def inject_default_record_table_size_setting():
    default_record_table_size_setting = Setting.query.filter(Setting.name == 'default_record_table_size').first()
    return dict(default_record_table_size_setting=default_record_table_size_setting.value)

# START USER AUTHENTICATION HANDLER
@app.before_request
def before_request():
    # check site maintenance mode first
    maintenance = Setting.query.filter(Setting.name == 'maintenance').first()
    if maintenance and maintenance.value == 'True':
        return render_template('maintenance.html')

    # check if user is anonymous
    g.user = current_user
    login_manager.anonymous_user = Anonymous

@login_manager.user_loader
def load_user(id):
    """
    This will be current_user
    """
    return User.query.get(int(id))

def dyndns_login_required(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if current_user.is_authenticated is False:
            return render_template('dyndns.html', response='badauth'), 200
        return f(*args, **kwargs)
    return decorated_function

@login_manager.request_loader
def login_via_authorization_header(request):
    auth_header = request.headers.get('Authorization')
    if auth_header:
        auth_header = auth_header.replace('Basic ', '', 1)
        try:
            auth_header = base64.b64decode(auth_header)
            username,password = auth_header.split(":")
        except TypeError, e:
            error = e.message['desc'] if 'desc' in e.message else e
            return None
        user = User(username=username, password=password, plain_text_password=password)
        try:
            auth = user.is_validate(method='LOCAL')
            if auth == False:
                return None
            else:
                login_user(user, remember = False)
                return user
        except Exception, e:
            return None
    return None

# END USER AUTHENTICATION HANDLER

# START CUSTOMIZE DECORATOR
def admin_role_required(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if g.user.role.name != 'Administrator':
            return redirect(url_for('error', code=401))
        return f(*args, **kwargs)
    return decorated_function
# END CUSTOMIZE DECORATOR

# START VIEWS
@app.errorhandler(400)
def http_bad_request(e):
    return redirect(url_for('error', code=400))

@app.errorhandler(401)
def http_unauthorized(e):
    return redirect(url_for('error', code=401))

@app.errorhandler(404)
def http_internal_server_error(e):
    return redirect(url_for('error', code=404))

@app.errorhandler(500)
def http_page_not_found(e):
    return redirect(url_for('error', code=500))

@app.route('/error/<string:code>')
def error(code, msg=None):
    supported_code = ('400', '401', '404', '500')
    if code in supported_code:
        return render_template('errors/%s.html' % code, msg=msg), int(code)
    else:
        return render_template('errors/404.html'), 404

@app.route('/register', methods=['GET'])
def register():
    SIGNUP_ENABLED = app.config['SIGNUP_ENABLED']
    if SIGNUP_ENABLED:
        return render_template('register.html')
    else:
        return render_template('errors/404.html'), 404

@app.route('/login', methods=['GET', 'POST'])
@login_manager.unauthorized_handler
def login():
    # these parameters will be needed in multiple paths
    LDAP_ENABLED = True if 'LDAP_TYPE' in app.config.keys() else False
    LOGIN_TITLE = app.config['LOGIN_TITLE'] if 'LOGIN_TITLE' in app.config.keys() else ''
    BASIC_ENABLED = app.config['BASIC_ENABLED']
    SIGNUP_ENABLED = app.config['SIGNUP_ENABLED']

    if g.user is not None and current_user.is_authenticated:
        return redirect(url_for('dashboard'))

    if request.method == 'GET':
        return render_template('login.html', ldap_enabled=LDAP_ENABLED, login_title=LOGIN_TITLE, basic_enabled=BASIC_ENABLED, signup_enabled=SIGNUP_ENABLED)
    
    # process login
    username = request.form['username']
    password = request.form['password']
    otp_token = request.form['otptoken'] if 'otptoken' in request.form else None
    auth_method = request.form['auth_method'] if 'auth_method' in request.form else 'LOCAL'

    # addition fields for registration case
    firstname = request.form['firstname'] if 'firstname' in request.form else None
    lastname = request.form['lastname'] if 'lastname' in request.form else None
    email = request.form['email'] if 'email' in request.form else None
    rpassword = request.form['rpassword'] if 'rpassword' in request.form else None
    
    if None in [firstname, lastname, email]:
        #login case
        remember_me = False
        if 'remember' in request.form:
            remember_me = True

        user = User(username=username, password=password, plain_text_password=password)

        try:
            auth = user.is_validate(method=auth_method)
            if auth == False:
                return render_template('login.html', error='Invalid credentials', ldap_enabled=LDAP_ENABLED, login_title=LOGIN_TITLE, basic_enabled=BASIC_ENABLED, signup_enabled=SIGNUP_ENABLED)
        except Exception, e:
            error = e.message['desc'] if 'desc' in e.message else e
            return render_template('login.html', error=error, ldap_enabled=LDAP_ENABLED, login_title=LOGIN_TITLE, basic_enabled=BASIC_ENABLED, signup_enabled=SIGNUP_ENABLED)

        # check if user enabled OPT authentication
        if user.otp_secret:
            if otp_token:
                good_token = user.verify_totp(otp_token)
                if not good_token:
                    return render_template('login.html', error='Invalid credentials', ldap_enabled=LDAP_ENABLED, login_title=LOGIN_TITLE, basic_enabled=BASIC_ENABLED, signup_enabled=SIGNUP_ENABLED)
            else:
                return render_template('login.html', error='Token required', ldap_enabled=LDAP_ENABLED, login_title=LOGIN_TITLE, basic_enabled=BASIC_ENABLED, signup_enabled=SIGNUP_ENABLED)

        login_user(user, remember = remember_me)
        return redirect(request.args.get('next') or url_for('index'))
    else:
        # registration case
        user = User(username=username, plain_text_password=password, firstname=firstname, lastname=lastname, email=email)
        
        # TODO: Move this into the JavaScript
        # validate password and password confirmation
        if password != rpassword:
            error = "Passsword and confirmation do not match"
            return render_template('register.html', error=error)
        
        try:
            result = user.create_local_user()
            if result == True:
                return render_template('login.html', username=username, password=password, ldap_enabled=LDAP_ENABLED, login_title=LOGIN_TITLE, basic_enabled=BASIC_ENABLED, signup_enabled=SIGNUP_ENABLED)
            else:
                return render_template('register.html', error=result)
        except Exception, e:
            error = e.message['desc'] if 'desc' in e.message else e
            return render_template('register.html', error=error)

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('login')) 


@app.route('/dashboard', methods=['GET', 'POST'])
@login_required
def dashboard():
    d = Domain().update()
    if current_user.role.name == 'Administrator':
        domains = Domain.query.all()
    else:
        domains = User(id=current_user.id).get_domain()

    # stats for dashboard
    domain_count = Domain.query.count()
    users = User.query.all()
    history_number = History.query.count()
    history = History.query.order_by(History.created_on.desc()).limit(4)
    server = Server(server_id='localhost')
    statistics = server.get_statistic()
    if statistics:
        uptime = filter(lambda uptime: uptime['name'] == 'uptime', statistics)[0]['value']
    else:
        uptime = 0
    return render_template('dashboard.html', domains=domains, domain_count=domain_count, users=users, history_number=history_number, uptime=uptime, histories=history)


@app.route('/domain/<string:domain_name>', methods=['GET', 'POST'])
@app.route('/domain', methods=['GET', 'POST'])
@login_required
def domain(domain_name):
    r = Record()
    domain = Domain.query.filter(Domain.name == domain_name).first()
    if domain:
        # query domain info from PowerDNS API
        zone_info = r.get_record_data(domain.name)
        if zone_info:
            jrecords = zone_info['records']
        else:
            # can not get any record, API server might be down
            return redirect(url_for('error', code=500))

        records = []
        #TODO: This should be done in the "model" instead of "view"
        if NEW_SCHEMA:
            for jr in jrecords:
                if jr['type'] in app.config['RECORDS_ALLOW_EDIT']:
                    for subrecord in jr['records']:
                        record = Record(name=jr['name'], type=jr['type'], status='Disabled' if subrecord['disabled'] else 'Active', ttl=jr['ttl'], data=subrecord['content'])
                        records.append(record)
        else:
            for jr in jrecords:
                if jr['type'] in app.config['RECORDS_ALLOW_EDIT']:
                    record = Record(name=jr['name'], type=jr['type'], status='Disabled' if jr['disabled'] else 'Active', ttl=jr['ttl'], data=jr['content'])
                    records.append(record)
        return render_template('domain.html', domain=domain, records=records, editable_records=app.config['RECORDS_ALLOW_EDIT'])
    else:
        return redirect(url_for('error', code=404))


@app.route('/admin/domain/add', methods=['GET', 'POST'])
@login_required
@admin_role_required
def domain_add():
    if request.method == 'POST':
        try:
            domain_name = request.form.getlist('domain_name')[0]
            domain_type = request.form.getlist('radio_type')[0]
            soa_edit_api = request.form.getlist('radio_type_soa_edit_api')[0]

            if ' ' in domain_name or not domain_name or not domain_type:
                return render_template('errors/400.html', msg="Please correct your input"), 400

            if domain_type == 'slave':
                if request.form.getlist('domain_master_address'):
                    domain_master_string = request.form.getlist('domain_master_address')[0]
                    domain_master_string = domain_master_string.replace(' ','')
                    domain_master_ips = domain_master_string.split(',')
            else:
                domain_master_ips = []
            d = Domain()
            result = d.add(domain_name=domain_name, domain_type=domain_type, soa_edit_api=soa_edit_api, domain_master_ips=domain_master_ips)
            if result['status'] == 'ok':
                history = History(msg='Add domain %s' % domain_name, detail=str({'domain_type': domain_type, 'domain_master_ips': domain_master_ips}), created_by=current_user.username)
                history.add()
                return redirect(url_for('dashboard'))
            else:
                return render_template('errors/400.html', msg=result['msg']), 400
        except:
            return redirect(url_for('error', code=500))
    return render_template('domain_add.html')


@app.route('/admin/domain/<string:domain_name>/delete', methods=['GET'])
@login_required
@admin_role_required
def domain_delete(domain_name):
    d = Domain()
    result = d.delete(domain_name)
    
    if result['status'] == 'error':
        return redirect(url_for('error', code=500))

    history = History(msg='Delete domain %s' % domain_name, created_by=current_user.username)
    history.add()

    return redirect(url_for('dashboard'))


@app.route('/admin/domain/<string:domain_name>/manage', methods=['GET', 'POST'])
@login_required
@admin_role_required
def domain_management(domain_name):
    if request.method == 'GET':
        domain = Domain.query.filter(Domain.name == domain_name).first()
        if not domain:
            return redirect(url_for('error', code=404))
        users = User.query.all()

        # get list of user ids to initilize selection data
        d = Domain(name=domain_name)
        domain_user_ids = d.get_user()

        return render_template('domain_management.html', domain=domain, users=users, domain_user_ids=domain_user_ids)

    if request.method == 'POST':
        # username in right column
        new_user_list = request.form.getlist('domain_multi_user[]')

        # get list of user ids to compare
        d = Domain(name=domain_name)
        domain_user_ids = d.get_user()

        # grant/revoke user privielges 
        d.grant_privielges(new_user_list)

        history = History(msg='Change domain %s access control' % domain_name, detail=str({'user_has_access': new_user_list}), created_by=current_user.username)
        history.add()

        return redirect(url_for('domain_management', domain_name=domain_name))


@app.route('/domain/<string:domain_name>/apply', methods=['POST'], strict_slashes=False)
@login_required
def record_apply(domain_name):
    """
    example jdata: {u'record_ttl': u'1800', u'record_type': u'CNAME', u'record_name': u'test4', u'record_status': u'Active', u'record_data': u'duykhanh.me'}
    """
    #TODO: filter removed records / name modified records.
    try:
        pdata = request.data
        jdata = json.loads(pdata)
        records = []

        for j in jdata:
            record = {
                        "name": domain_name if j['record_name'] in ['@', ''] else j['record_name'] + '.' + domain_name,
                        "type": j['record_type'],
                        "content": j['record_data'],
                        "disabled": True if j['record_status'] == 'Disabled' else False,
                        "name": domain_name if j['record_name'] in ['@', ''] else j['record_name'] + '.' + domain_name,
                        "ttl": int(j['record_ttl']) if j['record_ttl'] else 3600,
                         "type": j['record_type'],
                    }
            records.append(record)

        r = Record()
        result = r.apply(domain_name, records)
        if result['status'] == 'ok':
            history = History(msg='Apply record changes to domain %s' % domain_name, detail=str(records), created_by=current_user.username)
            history.add()
            return make_response(jsonify( result ), 200)
        else:
            return make_response(jsonify( result ), 400)
    except:
        print traceback.format_exc()
        return make_response(jsonify( {'status': 'error', 'msg': 'Error when applying new changes'} ), 500)


@app.route('/domain/<string:domain_name>/update', methods=['POST'], strict_slashes=False)
@login_required
def record_update(domain_name):
    """
    This route is used for domain work as Slave Zone only
    Pulling the records update from its Master
    """
    try:
        pdata = request.data
        jdata = json.loads(pdata)

        domain_name = jdata['domain']
        d = Domain()
        result = d.update_from_master(domain_name)
        if result['status'] == 'ok':
            return make_response(jsonify( {'status': 'ok', 'msg': result['msg']} ), 200)
        else:
            return make_response(jsonify( {'status': 'error', 'msg': result['msg']} ), 500)
    except:
        print traceback.format_exc()
        return make_response(jsonify( {'status': 'error', 'msg': 'Error when applying new changes'} ), 500)


@app.route('/domain/<string:domain_name>/record/<string:record_name>/type/<string:record_type>/delete', methods=['GET'])
@login_required
@admin_role_required
def record_delete(domain_name, record_name, record_type):
    try:
        r = Record(name=record_name, type=record_type)
        result = r.delete(domain=domain_name)
        if result['status'] == 'error':
            print result['msg']
    except:
        print traceback.format_exc()
        return redirect(url_for('error', code=500)), 500 
    return redirect(url_for('domain', domain_name=domain_name))


@app.route('/domain/<string:domain_name>/dnssec', methods=['GET'])
@login_required
def domain_dnssec(domain_name):
    domain = Domain()
    dnssec = domain.get_domain_dnssec(domain_name)
    return make_response(jsonify(dnssec), 200)

@app.route('/domain/<string:domain_name>/managesetting', methods=['GET', 'POST'])
@login_required
@admin_role_required
def admin_setdomainsetting(domain_name):
    if request.method == 'POST':
        #
        # post data should in format
        # {'action': 'set_setting', 'setting': 'default_action, 'value': 'True'}
        #
        try:
            pdata = request.data
            jdata = json.loads(pdata)
            data = jdata['data']
            if jdata['action'] == 'set_setting':
                new_setting = data['setting']
                new_value = str(data['value'])
                domain = Domain.query.filter(Domain.name == domain_name).first()
                setting = DomainSetting.query.filter(DomainSetting.domain == domain).filter(DomainSetting.setting == new_setting).first()
                
                if setting:
                    if setting.set(new_value):
                        history = History(msg='Setting %s changed value to %s for %s' % (new_setting, new_value, domain.name), created_by=current_user.username)
                        history.add()
                        return make_response(jsonify( { 'status': 'ok', 'msg': 'Setting updated.' } ))
                    else:
                        return make_response(jsonify( { 'status': 'error', 'msg': 'Unable to set value of setting.' } ))
                else:
                    if domain.add_setting(new_setting, new_value):
                        history = History(msg='New setting %s with value %s for %s has been created' % (new_setting, new_value, domain.name), created_by=current_user.username)
                        history.add()
                        return make_response(jsonify( { 'status': 'ok', 'msg': 'New setting created and updated.' } ))
                    else:
                        return make_response(jsonify( { 'status': 'error', 'msg': 'Unable to create new setting.' } )) 
            else:
                return make_response(jsonify( { 'status': 'error', 'msg': 'Action not supported.' } ), 400)
        except:
            print traceback.format_exc()
            return make_response(jsonify( { 'status': 'error', 'msg': 'There is something wrong, please contact Administrator.' } ), 400)


@app.route('/admin', methods=['GET', 'POST'])
@login_required
@admin_role_required
def admin():
    domains = Domain.query.all()
    users = User.query.all()
    
    server = Server(server_id='localhost')
    configs = server.get_config()
    statistics = server.get_statistic()
    history_number = History.query.count()
    
    if statistics:
        uptime = filter(lambda uptime: uptime['name'] == 'uptime', statistics)[0]['value']
    else:
        uptime = 0

    return render_template('admin.html', domains=domains, users=users, configs=configs, statistics=statistics, uptime=uptime, history_number=history_number)

@app.route('/admin/user/create', methods=['GET', 'POST'])
@login_required
@admin_role_required
def admin_createuser():
    if request.method == 'GET':
        return render_template('admin_createuser.html')
    
    if request.method == 'POST':
        fdata = request.form
        
        user = User(username=fdata['username'], plain_text_password=fdata['password'], firstname=fdata['firstname'], lastname=fdata['lastname'], email=fdata['email'])
        
        if fdata['password'] == "":
            return render_template('admin_createuser.html', user=user, blank_password=True)
        
        result = user.create_local_user();
        
        if result == 'Email already existed':
            return render_template('admin_createuser.html', user=user, duplicate_email=True)
        
        if result == 'Username already existed':
            return render_template('admin_createuser.html', user=user, duplicate_username=True)

        return redirect(url_for('admin_manageuser'))

@app.route('/admin/manageuser', methods=['GET', 'POST'])
@login_required
@admin_role_required
def admin_manageuser():
    if request.method == 'GET':
        users = User.query.order_by(User.username).all()
        return render_template('admin_manageuser.html', users=users)

    if request.method == 'POST':
        #
        # post data should in format
        # {'action': 'delete_user', 'data': 'username'}
        #
        try:
            pdata = request.data
            jdata = json.loads(pdata)
            data = jdata['data']

            if jdata['action'] == 'delete_user':
                user = User(username=data)
                result = user.delete()
                if result:
                    history = History(msg='Delete username %s' % data, created_by=current_user.username)
                    history.add()
                    return make_response(jsonify( { 'status': 'ok', 'msg': 'User has been removed.' } ), 200)
                else:
                    return make_response(jsonify( { 'status': 'error', 'msg': 'Cannot remove user.' } ), 500)
            
            elif jdata['action'] == 'revoke_user_privielges':
                user = User(username=data)
                result = user.revoke_privilege()
                if result:
                    history = History(msg='Revoke %s user privielges' % data, created_by=current_user.username)
                    history.add()
                    return make_response(jsonify( { 'status': 'ok', 'msg': 'Revoked user privielges.' } ), 200)
                else:
                    return make_response(jsonify( { 'status': 'error', 'msg': 'Cannot revoke user privilege.' } ), 500)    
            
            elif jdata['action'] == 'set_admin':
                username = data['username']
                is_admin = data['is_admin']
                user = User(username=username)
                result = user.set_admin(is_admin)
                if result:
                    history = History(msg='Change user role of %s' % username, created_by=current_user.username)
                    history.add()
                    return make_response(jsonify( { 'status': 'ok', 'msg': 'Changed user role successfully.' } ), 200)
                else:
                    return make_response(jsonify( { 'status': 'error', 'msg': 'Cannot change user role.' } ), 500)
            else:
                return make_response(jsonify( { 'status': 'error', 'msg': 'Action not supported.' } ), 400)
        except:
            print traceback.format_exc()
            return make_response(jsonify( { 'status': 'error', 'msg': 'There is something wrong, please contact Administrator.' } ), 400)


@app.route('/admin/history', methods=['GET', 'POST'])
@login_required
@admin_role_required
def admin_history():
    if request.method == 'POST':
        h = History()
        result = h.remove_all()
        if result:
            history = History(msg='Remove all histories', created_by=current_user.username)
            history.add()

            return make_response(jsonify( { 'status': 'ok', 'msg': 'Changed user role successfully.' } ), 200)
        else:
            return make_response(jsonify( { 'status': 'error', 'msg': 'Can not remove histories.' } ), 500)

    if request.method == 'GET':        
        histories = History.query.all()
        return render_template('admin_history.html', histories=histories)

@app.route('/admin/settings', methods=['GET'])
@login_required
@admin_role_required
def admin_settings():
    if request.method == 'GET':        
        settings = Setting.query.filter(Setting.name != 'maintenance')
        return render_template('admin_settings.html', settings=settings)
    
@app.route('/admin/setting/<string:setting>/toggle', methods=['POST'])
@login_required
@admin_role_required
def admin_settings_toggle(setting):
    result = Setting().toggle(setting)
    if (result):
        return make_response(jsonify( { 'status': 'ok', 'msg': 'Toggled setting successfully.' } ), 200)
    else:
        return make_response(jsonify( { 'status': 'error', 'msg': 'Unable to toggle setting.' } ), 500)

@app.route('/admin/setting/<string:setting>/edit', methods=['POST'])
@login_required
@admin_role_required
def admin_settings_edit(setting):
    pdata = request.data
    jdata = json.loads(pdata)
    new_value = jdata['value']
    result = Setting().set(setting, new_value)
    if (result):
        return make_response(jsonify( { 'status': 'ok', 'msg': 'Toggled setting successfully.' } ), 200)
    else:
        return make_response(jsonify( { 'status': 'error', 'msg': 'Unable to toggle setting.' } ), 500)

@app.route('/user/profile', methods=['GET', 'POST'])
@login_required
def user_profile():
    if request.method == 'GET':
        return render_template('user_profile.html')
    if request.method == 'POST':
        # get new profile info
        firstname = request.form['firstname'] if 'firstname' in request.form else ''
        lastname = request.form['lastname'] if 'lastname' in request.form else ''
        email = request.form['email'] if 'email' in request.form else ''
        new_password = request.form['password'] if 'password' in request.form else ''

        # json data
        if request.data:
            jdata = json.loads(request.data)
            data = jdata['data']
            if jdata['action'] == 'enable_otp':
                enable_otp = data['enable_otp']
                user = User(username=current_user.username)
                user.update_profile(enable_otp=enable_otp)
                return make_response(jsonify( { 'status': 'ok', 'msg': 'Change OTP Authentication successfully. Status: %s' % enable_otp } ), 200)

        # get new avatar
        save_file_name = None
        if 'file' in request.files:
            file = request.files['file']
            if file:
                filename = secure_filename(file.filename)
                file_extension = filename.rsplit('.', 1)[1]

                if file_extension.lower() in ['jpg', 'jpeg', 'png']:   
                    save_file_name = current_user.username + '.' + file_extension             
                    file.save(os.path.join(app.config['UPLOAD_DIR'], 'avatar', save_file_name))


        # update user profile
        user = User(username=current_user.username, plain_text_password=new_password, firstname=firstname, lastname=lastname, email=email, avatar=save_file_name, reload_info=False)
        user.update_profile()

        return render_template('user_profile.html')


@app.route('/user/avatar/<string:filename>')
def user_avatar(filename):
    return send_from_directory(os.path.join(app.config['UPLOAD_DIR'], 'avatar'), filename)


@app.route('/qrcode')
@login_required
def qrcode():
    if not current_user:
        return redirect(url_for('index'))

    # render qrcode for FreeTOTP
    url = pyqrcode.create(current_user.get_totp_uri())
    stream = BytesIO()
    url.svg(stream, scale=3)
    return stream.getvalue(), 200, {
        'Content-Type': 'image/svg+xml',
        'Cache-Control': 'no-cache, no-store, must-revalidate',
        'Pragma': 'no-cache',
        'Expires': '0'}


@app.route('/nic/checkip.html', methods=['GET', 'POST'])
def dyndns_checkip():
    # route covers the default ddclient 'web' setting for the checkip service
    return render_template('dyndns.html', response=request.environ.get('HTTP_X_REAL_IP', request.remote_addr))

@app.route('/nic/update', methods=['GET', 'POST'])
@dyndns_login_required
def dyndns_update():
    # dyndns protocol response codes in use are:
    # good: update successful
    # nochg: IP address already set to update address
    # nohost: hostname does not exist for this user account
    # 911: server error
    # have to use 200 HTTP return codes because ddclient does not read the return string if the code is other than 200
    # reference: https://help.dyn.com/remote-access-api/perform-update/
    # reference: https://help.dyn.com/remote-access-api/return-codes/
    hostname = request.args.get('hostname')
    myip = request.args.get('myip')

    try:
        # get all domains owned by the current user
        domains = User(id=current_user.id).get_domain()
    except:
        return render_template('dyndns.html', response='911'), 200
    
    domain = None
    domain_segments = hostname.split('.')
    for index in range(len(domain_segments)):
        domain_segments.pop(0)
        full_domain = '.'.join(domain_segments)
        potential_domain = Domain.query.filter(Domain.name == full_domain).first()
        if potential_domain in domains:
            domain = potential_domain
            break
    
    if not domain:
        history = History(msg="DynDNS update: attempted update of %s but it does not exist for this user" % hostname, created_by=current_user.username)
        history.add()
        return render_template('dyndns.html', response='nohost'), 200
        
    r = Record()
    r.name = hostname
    # check if the user requested record exists within this domain
    if r.exists(domain.name) and r.is_allowed:
        if r.data == myip:
            # record content did not change, return 'nochg'
            history = History(msg="DynDNS update: attempted update of %s but record did not change" % hostname, created_by=current_user.username)
            history.add()
            return render_template('dyndns.html', response='nochg'), 200
        else:
            oldip = r.data
            result = r.update(domain.name, myip)
            if result['status'] == 'ok':
                history = History(msg='DynDNS update: updated record %s in zone %s, it changed from %s to %s' % (hostname,domain.name,oldip,myip), detail=str(result), created_by=current_user.username)
                history.add()
                return render_template('dyndns.html', response='good'), 200
            else:
                return render_template('dyndns.html', response='911'), 200
    elif r.is_allowed:
        ondemand_creation = DomainSetting.query.filter(DomainSetting.domain == domain).filter(DomainSetting.setting == 'create_via_dyndns').first()
        if strtobool(ondemand_creation.value) == True:
            record = Record(name=hostname,type='A',data=myip,status=False,ttl=3600)
            result = record.add(domain.name)
            if result['status'] == 'ok':
                history = History(msg='DynDNS update: created record %s in zone %s, it now represents %s' % (hostname,domain.name,myip), detail=str(result), created_by=current_user.username)
                history.add()
                return render_template('dyndns.html', response='good'), 200
            
    history = History(msg="DynDNS update: attempted update of %s but it does not exist for this user" % hostname, created_by=current_user.username)
    history.add()
    return render_template('dyndns.html', response='nohost'), 200


@app.route('/', methods=['GET', 'POST'])
@login_required
def index():
    return redirect(url_for('dashboard')) 

# END VIEWS