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#!/usr/bin/perl
#
# FixMyStreet::Geocode::Bing
# Geocoding with Bing for FixMyStreet.
#
# Copyright (c) 2011 UK Citizens Online Democracy. All rights reserved.
# Email: matthew@mysociety.org; WWW: http://www.mysociety.org/
package FixMyStreet::Geocode::Bing;
use strict;
use Encode;
use File::Slurp;
use File::Path ();
use LWP::Simple;
use Digest::MD5 qw(md5_hex);
# string STRING CONTEXT
# Looks up on Bing 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, $params ) = @_;
$s .= '+' . $params->{town} if $params->{town} and $s !~ /$params->{town}/i;
my $url = "http://dev.virtualearth.net/REST/v1/Locations?q=$s";
$url .= '&userMapView=' . $params->{bounds}[0] . ',' . $params->{bounds}[1]
if $params->{bounds};
$url .= '&userLocation=' . $params->{centre} if $params->{centre};
$url .= '&c=' . $params->{bing_culture} if $params->{bing_culture};
my $cache_dir = FixMyStreet->config('GEO_CACHE') . 'bing/';
my $cache_file = $cache_dir . md5_hex($url);
my $js;
if (-s $cache_file) {
$js = File::Slurp::read_file($cache_file);
} else {
$url .= '&key=' . FixMyStreet->config('BING_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 $js;
}
if (!$js) {
return { error => _('Sorry, we could not parse that location. Please try again.') };
} elsif ($js =~ /BT\d/ && $params->{bing_country} eq 'United Kingdom') {
return { error => _("We do not currently cover Northern Ireland, I'm afraid.") };
}
$js = JSON->new->utf8->allow_nonref->decode($js);
if ($js->{statusCode} ne '200') {
return { error => _('Sorry, we could not find that location.') };
}
my $results = $js->{resourceSets}->[0]->{resources};
my ( $error, @valid_locations, $latitude, $longitude );
foreach (@$results) {
my $address = $_->{name};
next unless $_->{address}->{countryRegion} eq $params->{bing_country};
# Getting duplicate, yet different, results from Bing sometimes
next if @valid_locations
&& $valid_locations[-1]{address}{postalCode} eq $_->{address}{postalCode}
&& ( $valid_locations[-1]{address}{locality} eq $_->{address}{adminDistrict2}
|| $valid_locations[-1]{address}{adminDistrict2} eq $_->{address}{locality} );
( $latitude, $longitude ) = @{ $_->{point}->{coordinates} };
push (@$error, { address => $address, latitude => $latitude, longitude => $longitude });
push (@valid_locations, $_);
}
return { latitude => $latitude, longitude => $longitude } if scalar @valid_locations == 1;
return { error => $error };
}
sub reverse {
my ( $latitude, $longitude, $bing_culture, $cache ) = @_;
# Get nearest road-type thing from Bing
my $key = mySociety::Config::get('BING_MAPS_API_KEY', '');
if ($key) {
my $url = "http://dev.virtualearth.net/REST/v1/Locations/$latitude,$longitude?key=$key";
$url .= '&c=' . $bing_culture if $bing_culture;
my $j;
if ( $cache ) {
my $cache_dir = FixMyStreet->config('GEO_CACHE') . 'bing/';
my $cache_file = $cache_dir . md5_hex($url);
if (-s $cache_file) {
$j = File::Slurp::read_file($cache_file);
} else {
$j = LWP::Simple::get($url);
File::Path::mkpath($cache_dir);
File::Slurp::write_file($cache_file, $j) if $j;
}
} else {
$j = LWP::Simple::get($url);
}
if ($j) {
$j = JSON->new->utf8->allow_nonref->decode($j);
return $j;
}
}
return undef;
}
1;
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