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#!/usr/bin/perl
#
# FixMyStreet::Geocode
# The geocoding functions for FixMyStreet.
#
# Copyright (c) 2010 UK Citizens Online Democracy. All rights reserved.
# Email: matthew@mysociety.org; WWW: http://www.mysociety.org/
package FixMyStreet::Geocode::Google;
use strict;
use Encode;
use File::Slurp;
use File::Path ();
use LWP::Simple;
use Digest::MD5 qw(md5_hex);
use mySociety::Locale;
# string STRING CONTEXT
# Looks up on Google Maps API, and caches, a user-inputted location.
# Returns array of (LAT, LON, ERROR), where ERROR is either undef, a string, or
# an array of matches if there are more than one. The information in the query
# may be used to disambiguate the location in cobranded versions of the site.
sub string {
my ( $s, $c ) = @_;
my $params = $c->cobrand->disambiguate_location($s);
$s = FixMyStreet::Geocode::escape($s);
my $url = 'http://maps.google.com/maps/geo?q=' . $s;
$url .= '&ll=' . $params->{centre} if $params->{centre};
$url .= '&spn=' . $params->{span} if $params->{span};
if ($params->{google_country}) {
$url .= '&gl=' . $params->{google_country};
} elsif ($params->{country}) {
$url .= '&gl=' . $params->{country};
}
$url .= '&hl=' . $params->{lang} if $params->{lang};
my $cache_dir = FixMyStreet->config('GEO_CACHE') . 'google/';
my $cache_file = $cache_dir . md5_hex($url);
my $js;
if (-s $cache_file) {
$js = File::Slurp::read_file($cache_file);
} else {
# For some reason adding gl=uk is no longer sufficient to make google
# think we are in the UK for some locations so we explictly add UK to
# the address. We do it here so as not to invalidate existing cache
# entries
if ( $c->cobrand->country eq 'GB'
&& $url !~ /,\+UK/
&& $url !~ /united\++kingdom$/ )
{
if ( $url =~ /&/ ) {
$url =~ s/&/,+UK&/;
} else {
$url .= ',+UK';
}
}
$url .= '&sensor=false&key=' . FixMyStreet->config('GOOGLE_MAPS_API_KEY');
$js = LWP::Simple::get($url);
$js = encode_utf8($js) if utf8::is_utf8($js);
File::Path::mkpath($cache_dir);
File::Slurp::write_file($cache_file, $js) if $js && $js !~ /"code":6[12]0/;
}
if (!$js) {
return { error => _('Sorry, we could not parse that location. Please try again.') };
}
$js = JSON->new->utf8->allow_nonref->decode($js);
if ($js->{Status}->{code} ne '200') {
return { error => _('Sorry, we could not find that location.') };
}
my $results = $js->{Placemark};
my ( $error, @valid_locations, $latitude, $longitude );
foreach (@$results) {
next unless $_->{AddressDetails}->{Accuracy} >= 4;
my $address = $_->{address};
next unless $c->cobrand->geocoded_string_check( $address );
( $longitude, $latitude ) = @{ $_->{Point}->{coordinates} };
# These co-ordinates are output as query parameters in a URL, make sure they have a "."
mySociety::Locale::in_gb_locale {
push (@$error, {
address => $address,
latitude => sprintf('%0.6f', $latitude),
longitude => sprintf('%0.6f', $longitude)
});
};
push (@valid_locations, $_);
}
return { latitude => $latitude, longitude => $longitude } if scalar @valid_locations == 1;
return { error => $error };
}
1;
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