-#!/usr/bin/python2.6
+#!/usr/bin/python2.7
# -*- coding: UTF-8 -*-
"""Creates an Atom-Feed for single or multiple winterrodeln sled reports.
http://www.winterrodeln.org/feed/berichte/alle
http://www.winterrodeln.org/feed/berichte/bahn/kemater_alm
http://www.winterrodeln.org/feed/berichte/bahnen/5+280+251
+ http://www.winterrodeln.org/feed/berichte/region/osttirol
See:
http://www.atompub.org/
http://effbot.org/zone/element.htm
from xml.etree.ElementTree import Element, SubElement, tostring
from sqlalchemy.engine import create_engine
+from osgeo import ogr
import logging
+import webob.exc
from pylons import request, response, session, config, tmpl_context as c, url
from pylons.controllers.util import abort, redirect
log = logging.getLogger(__name__)
-def create_feed(page_title=None, page_ids=None):
+def create_feed(page_title=None, page_ids=None, region_name=None):
"""If a page_title is given, only the reports for the given sledrun are shown.
If a list of page_ids is given, only the reports for the selected pages are shown.
+ If a region name (lower case) is given, the reports just for this region are shown.
Otherwise, all reports are shown."""
engine = create_engine(config['sqlalchemy.url'])
limit = int(config['feedentrylimit'])
conn = engine.connect()
- select = "select wrreport.page_id, wrreport.page_title, wrreport.id, date_report, date_entry, `condition`, description, author_name, author_userid, author_username, position_longitude, position_latitude from wrreport left outer join wrsledruncache on wrreport.page_id=wrsledruncache.page_id "
+ select = 'select wrreport.page_id, wrreport.page_title, wrreport.id, date_report, date_entry, `condition`, description, author_name, author_userid, author_username, position_longitude, position_latitude from wrreport left outer join wrsledruncache on wrreport.page_id=wrsledruncache.page_id'
+ where = 'where date_invalid > now() and delete_date is null'
+ order = 'order by id desc'
+ limit = 'limit {0}'.format(limit)
+ params = []
+
if not page_title is None:
# page_title is given
page_title = page_title.replace('_', ' ')
- sql = select + "where lcase(wrreport.page_title) = lcase(%s) and date_invalid > now() and delete_date is null order by id desc limit {0}".format(limit)
- result = conn.execute(sql, page_title)
+ where += ' and lcase(wrreport.page_title) = lcase(%s)'
+ params += [page_title]
elif not page_ids is None:
# a list of page_ids is given
- sql = [select + "where "]
- if len(page_ids) > 0:
- sql += '('
- sql += " or ".join(['wrreport.page_id=%s' for page_id in page_ids])
- sql += ') '
- sql += 'and date_invalid > now() and delete_date is null order by id desc limit {0}'.format(limit)
- page_ids_str = [str(page_id) for page_id in page_ids]
- result = conn.execute("".join(sql), *page_ids_str)
+ if len(page_ids) == 0:
+ raise webob.exc.HTTPBadRequest()
+ where += ' and ('
+ where += " or ".join(['wrreport.page_id=%s' for page_id in page_ids])
+ where += ')'
+ params += map(str, page_ids)
+ elif not region_name is None:
+ # a name of a region is given
+ # (1) find out whether the region exists
+ subselect = 'select aswkb(border) as border_wkb from wrregion where name=lcase(%s)'
+ subresult = conn.execute(subselect, region_name)
+ if subresult.rowcount == 0:
+ # no region with such a name
+ raise webob.exc.HTTPNotFound()
+ assert subresult.rowcount == 1
+ row = subresult.fetchone()
+ # (2) now we have the border
+ border_wkb = row['border_wkb'] # border as WKB
+ where += ' and contains(geomfromwkb(%s), point(position_longitude, position_latitude))'
+ params += [border_wkb]
+ # the following variables are needed for the additional filtering below
+ border = ogr.CreateGeometryFromWkb(border_wkb)
+ point = ogr.Geometry(ogr.wkbPoint)
else:
# user wants to have all reports
- sql = select + "where date_invalid > now() and delete_date is null order by id desc limit {0}".format(limit)
- result = conn.execute(sql)
-
+ pass
+ sql = ' '.join([select, where, order, limit])
+ result = conn.execute(sql, *params)
feed = Element("feed", xmlns="http://www.w3.org/2005/Atom", attrib={'xmlns:georss': 'http://www.georss.org/georss', 'xmlns:wr': 'http://www.winterrodeln.org/schema/wrreport'})
feed_title = SubElement(feed, "title")
if not page_title is None:
feed_id.text = url(qualified=True, controller='berichte', action='bahn', id=page_title)
elif not page_ids is None:
- feed_id.text = url(qualified=True, controller='berichte', action='bahnen', id="+".join(page_ids_str))
+ feed_id.text = url(qualified=True, controller='berichte', action='bahnen', id="+".join(map(str, page_ids)))
+ elif not region_name is None:
+ feed_id.text = url(qualified=True, controller='berichte', action='region', id=region_name)
else:
feed_id.text = url(qualified=True, controller='berichte', action='alle')
feed_updated = SubElement(feed, "updated")
last_updated = None
for row in result:
page_id, page_title, report_id, date_report, date_entry, condition, description, author_name, author_userid, author_username, lon, lat = row
+
+ if not region_name is None:
+ # mysql 5.5 doesn't have specification conform geospacial functions.
+ # http://dev.mysql.com/doc/refman/5.5/en/functions-for-testing-spatial-relations-between-geometric-objects.html
+ # therefore we have to do further filtering here.
+ point.SetPoint(0, lon, lat)
+ if not point.Within(border):
+ continue
+
page_title_url = page_title.replace(u' ', u'_')
entry = SubElement(feed, "entry")
entry_title = SubElement(entry, "title")
abort(400) # bad request
response.content_type = 'application/atom+xml'
return create_feed(page_ids=page_ids)
+
+ def region(self, id):
+ """Handles URLs like
+ http://www.winterrodeln.org/feed/berichte/region/osttirol
+ """
+ response.content_type = 'application/atom+xml'
+ return create_feed(region_name=id)
+
ToastFreeware / philipp / winterrodeln / wrfeed.git / blobdiff