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common.py
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common.py
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# -*- coding: utf-8 -*-
# Copyright 2013 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License")
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
__author__ = 'ericbidelman@chromium.org (Eric Bidelman)'
import datetime
import json
import logging
import webapp2
# App Engine imports.
from google.appengine.api import users
from django.template.loader import render_to_string
from django.utils import feedgenerator
import models
import settings
class BaseHandler(webapp2.RequestHandler):
def __init__(self, request, response):
self.initialize(request, response)
# Add CORS and Chrome Frame to all responses.
self.response.headers.add_header('Access-Control-Allow-Origin', '*')
self.response.headers.add_header('X-UA-Compatible', 'IE=Edge,chrome=1')
# Settings can't be global in python 2.7 env.
logging.getLogger().setLevel(logging.DEBUG)
class JSONHandler(BaseHandler):
def __truncate_day_percentage(self, data):
# Need 6 decimals b/c num will by mutiplied by 100 to get a percentage.
data.day_percentage = float("%.*f" % (6, data.day_percentage))
return data
def _is_googler(self, user):
return user and user.email().endswith('@google.com')
def _clean_data(self, data):
user = users.get_current_user()
# Show raw day percentage numbers if user is a googler.
if not self._is_googler(user):
data = map(self.__truncate_day_percentage, data)
return data
def get(self, data, formatted=False):
self.response.headers['Content-Type'] = 'application/json;charset=utf-8'
if formatted:
return self.response.write(json.dumps(data, separators=(',',':')))
else:
data = [entity.to_dict() for entity in data]
return self.response.write(json.dumps(data, separators=(',',':')))
class ContentHandler(BaseHandler):
def _is_user_whitelisted(self, user):
if not user:
return False
is_whitelisted = False
if users.is_current_user_admin():
is_whitelisted = True
elif user.email().endswith('@chromium.org'):
is_whitelisted = True
else:
# TODO(ericbidelman): memcache user lookup.
query = models.AppUser.all(keys_only=True).filter('email =', user.email())
found_user = query.get()
if found_user is not None:
is_whitelisted = True
return is_whitelisted
def _add_common_template_values(self, d):
"""Mixin common values for templates into d."""
template_data = {
'prod': settings.PROD,
'APP_TITLE': settings.APP_TITLE,
'current_path': self.request.path,
'VULCANIZE': settings.VULCANIZE
}
user = users.get_current_user()
if user:
template_data['login'] = (
'Logout', users.create_logout_url(dest_url=self.request.path))
template_data['user'] = {
'is_whitelisted': self._is_user_whitelisted(user),
'is_admin': users.is_current_user_admin(),
'email': user.email(),
}
else:
template_data['user'] = None
template_data['login'] = (
'Login', users.create_login_url(dest_url=self.request.path))
d.update(template_data)
def render(self, data={}, template_path=None, status=None, message=None,
relpath=None):
if status is not None and status != 200:
self.response.set_status(status, message)
# Add common template data to every request.
self._add_common_template_values(data)
try:
self.response.out.write(render_to_string(template_path, data))
except Exception:
handle_404(self.request, self.response, Exception)
def render_atom_feed(self, title, data):
features_url = '%s://%s%s' % (self.request.scheme,
self.request.host,
self.request.path.replace('.xml', ''))
feature_url_prefix = '%s://%s%s' % (self.request.scheme,
self.request.host,
'/feature')
feed = feedgenerator.Atom1Feed(
title=unicode('%s - %s' % (settings.APP_TITLE, title)),
link=features_url,
description=u'New features exposed to web developers',
language=u'en'
)
for f in data:
pubdate = datetime.datetime.strptime(str(f['updated'][:19]),
'%Y-%m-%d %H:%M:%S')
feed.add_item(
title=unicode(f['name']),
link='%s/%s' % (feature_url_prefix, f.get('id')),
description=f.get('summary', ''),
pubdate=pubdate,
author_name=unicode(settings.APP_TITLE),
categories=[f['category']]
)
self.response.headers.add_header('Content-Type',
'application/atom+xml;charset=utf-8')
self.response.out.write(feed.writeString('utf-8'))
def handle_401(request, response, exception):
ERROR_401 = (
'<title>401 Unauthorized</title>\n'
'<h1>Error: Unauthorized</h1>\n'
'<h2>User does not have permission to view this page.</h2>')
response.write(ERROR_401)
response.set_status(401)
def handle_404(request, response, exception):
ERROR_404 = (
'<title>404 Not Found</title>\n'
'<h1>Error: Not Found</h1>\n'
'<h2>The requested URL <code>%s</code> was not found on this server.'
'</h2>' % request.url)
response.write(ERROR_404)
response.set_status(404)
def handle_500(request, response, exception):
logging.exception(exception)
ERROR_500 = (
'<title>500 Internal Server Error</title>\n'
'<h1>Error: 500 Internal Server Error</h1>')
response.write(ERROR_500)
response.set_status(500)