""" ================= learnpython.views ================= View functions for Learn Python web-site. """ import operator import socket from flask import flash, render_template, redirect, request, url_for from flask.ext.babel import lazy_gettext as _ from ordereddict import OrderedDict from learnpython import forms from learnpython.app import app, pages def contacts(name=None): """ Contacts form or subscribe page. Add ability to send email with question about cources or subscribe to lessons. """ messages = { 'contacts': { 'error': _('Cannot send message due to mail server problems. ' 'Please, try again later!'), 'success': _('Your message has been sent! Thanks for your ' 'feedback!'), }, 'subscribe': { 'error': _('Cannot apply subscription due to mail server ' 'problems. Please, try again later!'), 'success': _('You successfully subscribed to Learn Python ' 'courses! We will send you all necessary information ' 'later!') } } name = name or 'contacts' form_klass = getattr(forms, name.title() + 'Form') page_obj = pages.get(name) if request.method == 'POST': form = form_klass(request.form) if form.validate(): try: form.send() except socket.error: flash(messages[name]['error'], 'error') else: flash(messages[name]['success']) return redirect(url_for('status', next=request.path)) else: form = form_klass() context = {'form': form, 'is_{0}'.format(name): True, 'page': page_obj} return render_template('contacts.html', **context) def error(err): """ Error page. Prettify "Does Not Exist" and "Server Error" errors handling by displaying fancy page. """ code = getattr(err, 'code', 500) return render_template('error.html', error=err), code def flows(archive=None): """ Flows page. Show information of all available flows, which available in courses. """ prefix = 'flows/' if not archive else 'archive/{0}'.format(archive) data = sorted(filter(lambda page: page.path.startswith(prefix), pages), key=operator.itemgetter('order')) data = map(lambda page: (page.path.replace(prefix, ''), page), data) context = {'archive': archive, 'flows': OrderedDict(data)} return render_template('flows.html', **context) def page(name): """ Flat page. Show content of flat page, which named ``name``. Content of flat page would be rendered with ReStructuredText markup. If page not found - show "Does Not Exist" error page. """ page_obj = pages.get_or_404(name) context = {'is_{0}'.format(name): True, 'page': page_obj} return render_template('page.html', **context) def status(): """ Status page. Helper page, which displays after user sent message or has been subscribed. """ next_page = request.args.get('next', request.referrer or url_for('index')) return render_template('status.html', next=next_page) def subscribe(): """ Subscribe page. Disable ability of new subscribers if ``ALLOW_SUBSCRIBERS`` is False. """ if app.config['ALLOW_SUBSCRIBERS']: return contacts('subscribe') return page('nosubscribe')