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static.py
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static.py
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# Bloggart is currently based on Django 0.96
import os
os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'
from google.appengine.dist import use_library
use_library('django', '0.96')
import datetime
import hashlib
from google.appengine.api import memcache
from google.appengine.api import taskqueue
from google.appengine.ext import db
from google.appengine.ext import deferred
from google.appengine.datastore import entity_pb
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app
import fix_path
import aetycoon
import config
import utils
HTTP_DATE_FMT = "%a, %d %b %Y %H:%M:%S GMT"
TYPE_HOME = 0x0001 # 'Homepage'
TYPE_POST = 0x0002 # 'Post'
TYPE_PAGE = 0x0004 # 'Page'
TYPE_INDEX = 0x008 # 'Index' (i.e. Listing, Pagination, Tag, Archive, Search)
TYPE_OTHER = 0x0010 # 'Other' (i.e. atom feed, robots.txt, ...)
SITEMAP_DATA_MAPPING = {
TYPE_HOME : { "priority" : 1, "changefreq" : "daily" },
TYPE_POST : { "priority" : 0.8, "changefreq" : "weekly" },
TYPE_PAGE : { "priority" : 0.7, "changefreq" : "monthly" },
TYPE_INDEX : { "priority" : 0.3, "changefreq" : "weekly" },
TYPE_OTHER : { "priority" : 0.3, "changefreq" : "yearly" }
}
if config.google_site_verification is not None:
ROOT_ONLY_FILES = ['/robots.txt','/' + config.google_site_verification]
else:
ROOT_ONLY_FILES = ['/robots.txt']
class StaticContent(db.Model):
"""Container for statically served content.
The serving path for content is provided in the key name.
"""
body = db.BlobProperty();
content_type = db.StringProperty();
status = db.IntegerProperty(required=True, default=200);
last_modified = db.DateTimeProperty(required=True);
etag = aetycoon.DerivedProperty(lambda x: hashlib.sha1(x.body).hexdigest());
indexed = db.BooleanProperty(required=True, default=True);
headers = db.StringListProperty();
type = db.IntegerProperty(choices=(TYPE_HOME, TYPE_POST, TYPE_PAGE, TYPE_INDEX, TYPE_OTHER), default=TYPE_POST);
def get(path):
"""Returns the StaticContent object for the provided path.
Args:
path: The path to retrieve StaticContent for.
Returns:
A StaticContent object, or None if no content exists for this path.
"""
entity = None;
if ( config.memcaching ):
entity = memcache.get(path);
if entity:
entity = db.model_from_protobuf(entity_pb.EntityProto(entity))
else:
entity = StaticContent.get_by_key_name(path)
if entity:
memcache.set(path, db.model_to_protobuf(entity).Encode())
return entity
def set(path, body, content_type, indexed=True, last_modified=None, type=TYPE_POST, **kwargs):
import static
"""Sets the StaticContent for the provided path.
Args:
path: The path to store the content against.
body: The data to serve for that path.
content_type: The MIME type to serve the content as.
indexed: Index this page in the sitemap?
type: The type of StaticContent (a post? a page? an index?...).
**kwargs: Additional arguments to be passed to the StaticContent constructor
Returns:
A StaticContent object.
"""
if last_modified is None:
last_modified = datetime.datetime.now(utils.tzinfo()).replace(second=0, microsecond=0)
defaults = {
"last_modified": last_modified,
}
defaults.update(kwargs)
content = StaticContent(
key_name = path,
body = body,
content_type = content_type,
indexed = indexed,
type = static.TYPE_HOME if path == '/' else type,
**defaults);
content.put()
memcache.replace(path, db.model_to_protobuf(content).Encode())
if indexed:
regenerate_sitemap()
return content
def regenerate_sitemap():
try:
now = datetime.datetime.now(utils.tzinfo()).replace(second=0, microsecond=0)
eta = now.replace(second=0, microsecond=0) + datetime.timedelta(seconds=config.sitemap_generation_delay_sec)
# Queue a Deferred Task to regenerate the 'sitemap.xml', in 5 minutes from now
deferred.defer(
utils._regenerate_sitemap,
_name='sitemap-%s' % (now.strftime('%Y%m%d%H'),), # Run max 1 per hour
_eta=eta)
except (taskqueue.TaskAlreadyExistsError, taskqueue.TombstonedTaskError), e:
pass
def add(path, body, content_type, indexed=True, **kwargs):
"""Adds a new StaticContent and returns it.
Args:
As per set().
Returns:
A StaticContent object, or None if one already exists at the given path.
"""
def _tx():
if StaticContent.get_by_key_name(path):
return None
return set(path, body, content_type, indexed=indexed, **kwargs)
return db.run_in_transaction(_tx)
def remove(path):
"""Deletes a StaticContent.
Args:
path: Path of the static content to be removed.
"""
memcache.delete(path)
def _tx():
content = StaticContent.get_by_key_name(path)
if not content:
return
content.delete()
return db.run_in_transaction(_tx)
"""
This function is a wrapper to "get", and redirects the client if it does not come from the correct HOST
I see no reason to use this fucntion.
"""
def canonical_redirect(func):
def _dec(self, path):
if not self.request.host == config.host:
self.redirect("%s://%s%s" % (self.request.scheme, config.host, path), True)
else:
func(self, path)
return _dec
class StaticContentHandler(webapp.RequestHandler):
PAGE_NOT_FOUND_404_PATH = "404.html";
def output_content(self, content, serve=True):
if content.content_type:
self.response.headers['Content-Type'] = content.content_type
last_modified = content.last_modified.strftime(HTTP_DATE_FMT)
self.response.headers['Last-Modified'] = last_modified
self.response.headers['ETag'] = '"%s"' % (content.etag,)
for header in content.headers:
key, value = header.split(':', 1)
self.response.headers[key] = value.strip()
if serve:
self.response.set_status(content.status)
self.response.out.write(content.body)
else:
self.response.set_status(304)
#@canonical_redirect
#I see no reason to decorate "get" with "canonical_redirect"
def get(self, path):
if not path.startswith(config.url_prefix):
if path not in ROOT_ONLY_FILES:
self.error(404)
self.response.out.write(utils.render_template( StaticContentHandler.PAGE_NOT_FOUND_404_PATH ));
return
else:
if config.url_prefix != '':
path = path[len(config.url_prefix):]# Strip off prefix
if path in ROOT_ONLY_FILES:# This lives at root
self.error(404)
self.response.out.write(utils.render_template( StaticContentHandler.PAGE_NOT_FOUND_404_PATH ));
return
content = get(path)
if not content:
self.error(404)
self.response.out.write(utils.render_template( StaticContentHandler.PAGE_NOT_FOUND_404_PATH ));
return
serve = True
if 'If-Modified-Since' in self.request.headers:
try:
last_seen = datetime.datetime.strptime(
self.request.headers['If-Modified-Since'].split(';')[0],# IE8 '; length=XXXX' as extra arg bug
HTTP_DATE_FMT)
if last_seen >= content.last_modified.replace(microsecond=0):
serve = False
except ValueError, e:
import logging
logging.error('StaticContentHandler in static.py, ValueError:' + self.request.headers['If-Modified-Since'])
if 'If-None-Match' in self.request.headers:
etags = [x.strip('" ')
for x in self.request.headers['If-None-Match'].split(',')]
if content.etag in etags:
serve = False
self.output_content(content, serve)
application = webapp.WSGIApplication([
('(/.*)', StaticContentHandler),
])
def main():
fix_path.fix_sys_path()
run_wsgi_app(application)
if __name__ == '__main__':
main()