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# -*- coding: utf-8 -*-

import flaskext_compat
flaskext_compat.activate()

import account
import ldap
import os
from copy import deepcopy
from flask import flash, Flask, g, redirect, request, session, url_for
from utils import *
from forms import RegisterForm, RegisterCompleteForm, LoginForm, SettingsForm


app = Flask(__name__)
app.config.from_object('default_settings')
if 'SPLINE_ACCOUNT_WEB_SETTINGS' in os.environ:
    app.config.from_envvar('SPLINE_ACCOUNT_WEB_SETTINGS')

app.all_services = account.SERVICES #TODO: take that from our json file or so

@app.before_request
def ldap_connect():
    g.ldap = account.AccountService(account.LDAP_HOST, account.LDAP_BASE_DN,
        account.LDAP_ADMIN_USER, account.LDAP_ADMIN_PASS, app.all_services)

    g.user = None

    if 'username' in session and 'password' in session:
        try:
            g.user = g.ldap.auth(session['username'], decrypt_password(session['password']))
        except ldap.INVALID_CREDENTIALS:
            # we had crap in the session, delete it
            logout_user()


@app.route('/', methods=['GET', 'POST'])
@templated('index.html')
def index():
    form = LoginForm(request.form)
    if request.method == 'POST' and form.validate():
        if login_user(form.username.data, form.password.data):
            flash(u'Erfolgreich eingeloggt (als %s)' % g.user.uid, 'success')
            return redirect(url_for('settings'))
        else:
            flash(u'Ungültiger Benutzername und/oder Passwort', 'error')

    return {'form': form}


@app.route('/register', methods=['GET', 'POST'])
@templated('register.html')
@logout_required
def register():
    #TODO: check for double uids
    form = RegisterForm(request.form)
    if request.method == 'POST' and form.validate():
        username = form.username.data
        mail = form.mail.data

        confirm_token = make_confirmation('register', (username, mail))
        confirm_link = url_for('register_complete', token=confirm_token, _external=True)

        body = render_template('mail/register.txt', username=username,
                               mail=mail, link=confirm_link)

        send_mail(mail, u'E-Mail-Adresse bestätigen', body,
                  sender=app.config.get('MAIL_CONFIRM_SENDER'))

        flash(u'Es wurde eine E-Mail an die angegebene Adresse geschickt, '
              u'um diese zu überprüfen. Bitte folge den Anweisungen in der '
              u'E-Mail.')

        return redirect(url_for('index'))

    return {'form': form}


@app.route('/register/<token>', methods=['GET', 'POST'])
@templated('register_complete.html')
@logout_required
def register_complete(token):
    #TODO: check for double uids
    username, mail = http_verify_confirmation('register', token.encode('ascii'), timeout=3*24*60*60)


    form = RegisterCompleteForm(request.form)
    if request.method == 'POST' and form.validate():
        password = form.password.data

        user = account.Account(username, mail, password=form.password.data)
        g.ldap.register(user)

        # populate request context and session
        assert login_user(user.uid, user.password)

        flash(u'Benutzer erfolgreich angelegt.')
        return redirect(url_for('settings'))

    return {
        'form': form,
        'token': token,
        'username': username,
        'mail': mail,
    }



@app.route('/settings', methods=['GET', 'POST'])
@templated('settings.html')
@login_required
def settings():
    form = SettingsForm(request.form, mail=g.user.mail)
    if request.method == 'POST' and form.validate():
        changed = False

        if form.mail.data and form.mail.data != g.user.mail:
            confirm_token = make_confirmation('change_mail', (g.user.uid, form.mail.data))
            confirm_link = url_for('change_mail', token=confirm_token, _external=True)

            body = render_template('mail/change_mail.txt', username=g.user.uid,
                                   mail=form.mail.data, link=confirm_link)

            send_mail(form.mail.data, u'E-Mail-Adresse bestätigen', body,
                      sender=app.config.get('MAIL_CONFIRM_SENDER'))

            flash(u'Es wurde eine E-Mail an die angegebene Adresse geschickt, '
                  u'um diese zu überprüfen. Bitte folge den Anweisungen in der '
                  u'E-Mail.')
            changed = True

        if form.password.data:
            g.user.change_password(form.password.data)
            g.ldap.update(g.user)
            session['password'] = encrypt_password(form.password.data)

            flash(u'Passwort geändert', 'success')
            changed = True

        if changed:
            return redirect(url_for('settings'))
        else:
            flash(u'Nichts geändert')


    services = deepcopy(app.all_services)
    for s in services:
        s.changed = s.id in g.user.services

    return {
        'form': form,
        'services': services,
    }

@app.route('/settings/change_mail/<token>')
@login_required
def change_mail(token):
    username, mail = http_verify_confirmation('change_mail', token.encode('ascii'), timeout=3*24*60*60)

    if g.user.uid != username:
        raise Forbidden(u'Bitte logge dich als der Benutzer ein, dessen E-Mail-Adresse du ändern willst.')
    g.user.change_email(mail)
    g.ldap.update(g.user)

    flash(u'E-Mail-Adresse geändert.', 'success')
    return redirect(url_for('settings'))


@app.route('/logout')
def logout():
    logout_user()
    flash(u'Erfolgreich ausgeloggt.', 'success')
    return redirect(url_for('index'))


@app.route('/debug')
def debug():
    raise Exception()


if __name__ == '__main__':
    app.run(debug=True)


# wir brauchen:
#   registrieren
#   login
#     passwort ändern (master-passwort, einzelne)
#     email ändern

# später:
#   account löschen
#   openid-provider (ggf mehr Details: Realname, Zeitzone, ...)