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# w.c.s. - web application for online forms
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# Copyright (C) 2005-2016 Entr'ouvert
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, see <http://www.gnu.org/licenses/>.
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import collections
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import json
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import urllib2
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try:
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from PIL import Image
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from PIL.ExifTags import TAGS, GPSTAGS
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except ImportError:
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Image = None
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from quixote import get_publisher
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from qommon import get_logger
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from qommon.form import RadiobuttonsWidget, StringWidget, CheckboxWidget
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from qommon.misc import http_get_page
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from wcs.workflows import (WorkflowStatusItem, register_item_class,
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template_on_formdata)
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class GeolocateWorkflowStatusItem(WorkflowStatusItem):
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description = N_('Geolocate')
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key = 'geolocate'
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method = 'string'
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address_string = None
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map_variable = None
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photo_variable = None
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overwrite = False
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def get_parameters(self):
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return ('method', 'address_string', 'map_variable', 'photo_variable', 'overwrite')
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def add_parameters_widgets(self, form, parameters, prefix='', formdef=None):
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methods = collections.OrderedDict(
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[('address_string', _('Address String')),
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('map_variable', _('Map Variable')),
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('photo_variable', _('Photo Variable'))])
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if Image is None:
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del methods['photo_variable']
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if 'method' in parameters:
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form.add(RadiobuttonsWidget, '%smethod' % prefix,
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title=_('Method'),
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options=methods.items(),
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value=self.method,
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attrs={'data-dynamic-display-parent': 'true'})
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if 'address_string' in parameters:
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form.add(StringWidget, '%saddress_string' % prefix,
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title=_('Address String'), value=self.address_string,
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attrs={
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'data-dynamic-display-child-of': '%smethod' % prefix,
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'data-dynamic-display-value': methods.get('address_string'),
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})
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if 'map_variable' in parameters:
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form.add(StringWidget, '%smap_variable' % prefix,
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title=_('Map Variable'), value=self.map_variable,
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attrs={
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'data-dynamic-display-child-of': '%smethod' % prefix,
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'data-dynamic-display-value': methods.get('map_variable'),
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})
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if 'photo_variable' in parameters:
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form.add(StringWidget, '%sphoto_variable' % prefix,
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title=_('Photo Variable'), value=self.photo_variable,
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attrs={
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'data-dynamic-display-child-of': '%smethod' % prefix,
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'data-dynamic-display-value': methods.get('photo_variable'),
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})
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if 'overwrite' in parameters:
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form.add(CheckboxWidget, '%soverwrite' % prefix,
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title=_('Overwrite existing geolocation'),
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value=self.overwrite)
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def perform(self, formdata):
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if not self.method:
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return
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geolocation_point = formdata.formdef.geolocations.keys()[0]
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if not formdata.geolocations:
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formdata.geolocations = {}
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if formdata.geolocations.get(geolocation_point) and not self.overwrite:
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return
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location = getattr(self, 'geolocate_' + self.method)(formdata)
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if location:
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formdata.geolocations[geolocation_point] = location
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formdata.store()
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def geolocate_address_string(self, formdata):
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nominatim_url = get_publisher().get_site_option('nominatim_url')
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if not nominatim_url:
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nominatim_url = 'http://nominatim.openstreetmap.org'
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try:
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address = template_on_formdata(formdata, self.address_string)
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except ezt.EZTException:
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get_logger().error('error in template for address string [%s]', self.address_string)
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return
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url = '%s/search?q=%s&format=json' % (nominatim_url, urllib2.quote(address))
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response, status, data, auth_header = http_get_page(url)
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if status != 200:
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get_logger().error('error calling geocoding service [%s]', status)
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return
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data = json.loads(data)
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if len(data) == 0:
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get_logger().error('error finding location')
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return
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coords = data[0]
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return {'lon': float(coords['lon']), 'lat': float(coords['lat'])}
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def geolocate_map_variable(self, formdata):
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try:
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value = self.compute(self.map_variable)
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except:
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get_logger().error('error geolocating from map variable [%s]', self.map_variable)
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return
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if not value:
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return
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lat, lon = map(float, value.split(';'))
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return {'lon': lon, 'lat': lat}
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def geolocate_photo_variable(self, formdata):
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if Image is None:
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get_logger().error('error geolocating from file (missing PIL)')
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return
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try:
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value = self.compute(self.photo_variable)
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except:
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get_logger().error('error geolocating from photo variable [%s]', self.photo_variable)
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return
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try:
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image = Image.open(value.get_file_pointer())
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except IOError:
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get_logger().error('error geolocating from file')
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return
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exif_data = image._getexif()
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if exif_data:
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gps_info = exif_data.get(0x8825)
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if gps_info:
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# lat_ref will be N/S, lon_ref wil l be E/W
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# lat and lon will be degrees/minutes/seconds (value, denominator),
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# like ((33, 1), (51, 1), (2191, 100))
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lat_ref, lat, lon_ref, lon = gps_info[1], gps_info[2], gps_info[3], gps_info[4]
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lat = (1.0*lat[0][0]/lat[0][1] + 1.0*lat[1][0]/lat[1][1]/60 + 1.0*lat[2][0]/lat[2][1]/3600)
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lon = (1.0*lon[0][0]/lon[0][1] + 1.0*lon[1][0]/lon[1][1]/60 + 1.0*lon[2][0]/lon[2][1]/3600)
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if lat_ref == 'S':
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lat = -lat
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if lon_ref == 'W':
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lon = -lon
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return {'lon': lon, 'lat': lat}
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return
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register_item_class(GeolocateWorkflowStatusItem)
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