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web.py
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web.py
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# -*- coding: utf-8 -*-
import sys
import os
from os.path import join, dirname
import time
from google.appengine.api import memcache
from webapp2 import RequestHandler
from mako.lookup import Template, TemplateLookup
from mako import exceptions
from webob import exc
from data import world, Country, Brewery, Beer
from form import CountryForm, BreweryForm, BeerForm
lookup = TemplateLookup(directories = [join(dirname(__file__), "templates")],
input_encoding = "utf-8",
output_encoding = "utf-8",
filesystem_checks = True)
def renderTemplate(request, templateName, **data):
write = request.response.out.write
try:
template = lookup.get_template(templateName)
write(template.render(request=request, **data))
except exceptions.TopLevelLookupException:
request.response.status = 404
write("Cant find template '%s'" % templateName)
except:
request.response.status = 500
write(exceptions.html_error_template().render())
def getMap(request):
renderTemplate(request, "map.html")
def getBeers(request):
renderTemplate(request, "beers.html")
def postImagePreview(request):
if request.method != "POST":
raise exc.HTTPMethodNotAllowed()
#TODO validation use ImageField?
if request.get("qqfile"):
image = request.body
previewId = request.get('previewId')
elif request.POST.get('qqfile'):
image = request.POST.get("qqfile").value
previewId = request.POST.get('previewId')
else:
image = ""
raise RuntimeError("TODO")
if len(image) < memcache.MAX_VALUE_SIZE:
# TODO check size in validation
timeout = 3600 # 1 hour
memcache.set(previewId, image, timeout, namespace="ImagePreview")
request.response.headers['Content-Type'] = "text/plain"
request.response.out.write("{previewId: '%s'}" % previewId)
def getImagePreview(request):
if request.method != "GET":
raise exc.HTTPMethodNotAllowed()
request.path_info_pop() #/preview
request.path_info_pop() #/time
previewId = request.path_info
image = memcache.get(previewId, namespace="ImagePreview")
if image:
#TODO validation use ImageField?
headers = request.response.headers
headers["Expires"] = "Sat, 26 Jul 1997 05:00:00 GMT"
headers["Cache-Control"] = "no-store, no-cache, must-revalidate"
headers['Content-Type'] = "image/png"
request.response.out.write(image)
class WobHandler(RequestHandler):
"""This is a generic WoB request handler"""
Form = None
view = None
edit = None
def __init__(self, request, response, wobObj=None):
RequestHandler.__init__(self, request, response)
self.wobObj = wobObj
def dispatch(self):
# memories of bobo traverse
name = self.request.path_info_pop()
if name:
if name.endswith('.png') and self.Form.hasImageField(name[:-4]):
return self.getImage(self.wobObj, name[:-4])
else:
return self.traverseTo(name)
return RequestHandler.dispatch(self)
def get(self):
if self.request.query_string == "edit":
form = self.Form(obj=self.wobObj)
template = "edit_%s.html" % self.name
else:
form = self.Form()
template = "%s.html" % self.name
kwargs = { "form": form,
self.name: self.wobObj }
renderTemplate(self.request, template, **kwargs)
def post(self):
form = self.Form(self.request.POST, self.wobObj)
if form.validate():
self.error = "something"
return self.get()
form.populate_obj(self.wobObj)
self.wobObj.put()
return self.redirect(self.request.path)
def getImage(self, wobObj, field):
if self.request.method != "GET":
raise exc.HTTPMethodNotAllowed()
image = getattr(wobObj, field, "")
self.response.headers['Content-Type'] = "image/png"
self.response.out.write(image)
return None
def _findBrewery(self, name):
# TODO
#brewery = world.getBrewery(name)
return None
def _findBeer(self, name):
# TODO
return None
def err404(self, msg):
self.error(404)
self.response.out.write(msg)
class MainHandler(WobHandler):
def __init__(self, request, response):
WobHandler.__init__(self, request, response)
def dispatch(self):
name = self.request.path_info_pop()
country = world.getCountry(name)
if country:
handler = CountryHandler(self.request, self.response, country)
return handler.dispatch()
brewery = self._findBrewery(name)
if brewery:
handler = BreweryHandler(self.request, self.response, brewery)
return handler.dispatch()
if not self.request.path_info_peek():
# auto-create country if that is all that is on the path
country = world.createCountry(name)
handler = CountryHandler(self.request, self.response, country)
return handler.dispatch()
self.err404("Cannot find country or brewery '%s'" % name)
return None
class CountryHandler(WobHandler):
Form = CountryForm
name = "country"
def traverseTo(self, name):
brewery = self._findBrewery(name)
if brewery:
handler = BreweryHandler(self.request, self.response, brewery)
return handler.dispatch()
self.err404("Cannot find brewery '%s'" % name)
return None
class BreweryHandler(WobHandler):
Form = BreweryForm
name = "brewery"
def traverseTo(self, name):
beer = self._findBeer(name)
if beer:
handler = BeerHandler(self.request, self.response, beer)
return handler.dispatch()
self.err404("Cannot find beer '%s'" % name)
return None
class BeerHandler(WobHandler):
Form = BeerForm
name = "beer"
def traverseTo(self, name):
self.err404("'%s' unknown" % name)
return None