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main.py
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import cgi
import urllib
import logging
import json
import os
from google.appengine.ext.webapp import template
from google.appengine.api import images
import jinja2
import webapp2
import dao
from mem_cache import MemCacheHandler
import user
from user import Privileges
JINJA_ENVIRONMENT = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
extensions=['jinja2.ext.autoescape'],
autoescape=True)
def return_not_on_whitelist_screen(instance):
nickname = user.get_nickname()
logout_url = user.get_logout_url(url)
message = 'Welcome, {}, you are not on the whitelist, '.format(nickname)
template_values = {
"message": message,
"button_msg": "sign out.",
"loginout_url": logout_url
}
template = JINJA_ENVIRONMENT.get_template('empty_index.html')
instance.set_status(401)
instance.response.write(template.render(template_values))
def return_login_screen(instance):
login_url = user.get_login_url('/')
message = 'Welcome, please '
template_values = {
"message": message,
"button_msg": "sign in.",
"loginout_url": login_url
}
template = JINJA_ENVIRONMENT.get_template('empty_index.html')
instance.response.write(template.render(template_values))
class UpdateCache(webapp2.RequestHandler):
def get(self):
logging.info("About to update the events cache")
self.response.headers['Content-Type'] = 'application/json'
guestbook_name = self.request.get('guestbook_name')
guestbook_name = "default_guestbook" if guestbook_name is None or len(guestbook_name) == 0 else guestbook_name
MemCacheHandler.update_events_cache(guestbook_name)
self.response.out.write('Event cache updated')
class Api(webapp2.RequestHandler):
def get(self):
privilege = user.get_user_privileges()
if Privileges.can_read(privilege):
self.response.headers['Content-Type'] = 'application/json'
guestbook_name = self.request.get('guestbook_name')
guestbook_name = "default_guestbook" if guestbook_name is None or len(guestbook_name) == 0 else guestbook_name
greetings = MemCacheHandler.get_all_events(guestbook_name)
self.response.out.write(json.dumps(greetings))
elif Privileges.is_blocked(privilege):
return_not_on_whitelist_screen(self)
else:
return_login_screen(self)
class MainPage(webapp2.RequestHandler):
def get(self):
privilege = user.get_user_privileges()
if Privileges.can_read(privilege):
guestbook_name = self.request.get('guestbook_name')
guestbook_name = "default_guestbook" if guestbook_name is None or len(guestbook_name) == 0 else guestbook_name
update = False
escaped_guestbook_name = None
if Privileges.can_write(privilege):
update = True
guestbook_name = urllib.urlencode({'guestbook_name': guestbook_name})
escaped_guestbook_name = cgi.escape(guestbook_name)
logout_url = user.get_logout_url('/')
template_values = {
"update": update,
"guestbook_name": guestbook_name,
"escaped_guestbook_name": escaped_guestbook_name,
"logout_url": logout_url
}
template = JINJA_ENVIRONMENT.get_template('index.html')
self.response.write(template.render(template_values))
elif Privileges.is_blocked(privilege):
return_not_on_whitelist_screen(self)
else:
return_login_screen(self)
class Image(webapp2.RequestHandler):
def get(self):
privilege = user.get_user_privileges()
if Privileges.can_read(privilege):
photo_type = self.request.get('type')
[thumbnail, photo] = MemCacheHandler.get_images_and_update_image_cache(self.request.get('img_id'))
if thumbnail is not None and photo is not None:
self.response.headers['Content-Type'] = 'image/png'
if photo_type == "thumbnail":
self.response.out.write(thumbnail)
else:
self.response.out.write(photo)
else:
self.set_status(404)
self.response.out.write('No image')
elif Privileges.is_blocked(privilege):
return_not_on_whitelist_screen(self)
else:
return_login_screen(self)
class Guestbook(webapp2.RequestHandler):
def rotate_and_get_metadata(self, uploaded_image):
img = images.Image(image_data=uploaded_image)
img.rotate(0)
img.set_correct_orientation(1)
photo = img.execute_transforms(parse_source_metadata=True, output_encoding=images.JPEG)
logging.info(img.get_original_metadata())
return [photo, img.get_original_metadata()]
def post(self):
privilege = user.get_user_privileges()
if Privileges.can_write(privilege):
guestbook_name = self.request.get('guestbook_name')
guestbook_name = "default_guestbook" if guestbook_name is None or len(guestbook_name) == 0 else guestbook_name
greeting = dao.create_greeting(guestbook_name)
greeting.author = user.get_nickname()
greeting.content = self.request.get('content')
photo = self.request.get('img')
if photo is None or len(photo) == 0:
greeting = 'No photo supplied.'
template_values = {
"message": greeting,
"button_msg": "Try again",
"loginout_url": "/"
}
template = JINJA_ENVIRONMENT.get_template('empty_index.html')
self.response.write(template.render(template_values))
self.response.set_status(400)
else:
[photo, metadata] = self.rotate_and_get_metadata(photo)
if 'GPSLatitude' not in metadata or 'GPSLongitude' not in metadata:
greeting = 'No GPS coordinates in the image provided.'
template_values = {
"message": greeting,
"button_msg": "Try again",
"loginout_url": "/"
}
template = JINJA_ENVIRONMENT.get_template('empty_index.html')
self.response.write(template.render(template_values))
self.response.set_status(400)
else:
greeting.photo = images.resize(photo, 768, 768)
greeting.thumbnail = images.resize(photo, 128, 128)
greeting.photo_latitude = metadata['GPSLatitude']
greeting.photo_longitude = metadata['GPSLongitude']
greeting.photo_datetime = metadata['DateTime'] if 'DateTime' in metadata else ""
greeting.put()
MemCacheHandler.update_events_cache(guestbook_name)
self.redirect('/?' + urllib.urlencode(
{'guestbook_name': guestbook_name}))
elif Privileges.is_blocked(privilege):
return_not_on_whitelist_screen(self)
else:
return_login_screen(self)
app = webapp2.WSGIApplication([('/', MainPage),
('/img', Image),
('/sign', Guestbook),
('/v1/api', Api),
('/v1/cache/update', UpdateCache)],
debug=True)