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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;
use strict;
use Encode;
use Error qw(:try);
use File::Slurp;
use File::Path ();
use LWP::Simple;
use Digest::MD5 qw(md5_hex);
use URI::Escape;
use Cobrand;
use Page;
use Utils;
use mySociety::Config;
use mySociety::Locale;
use mySociety::MaPit;
use mySociety::PostcodeUtil;
use mySociety::Web qw(NewURL);
BEGIN {
(my $dir = __FILE__) =~ s{/[^/]*?$}{};
mySociety::Config::set_file("$dir/../../conf/general");
}
# lookup STRING QUERY
# Given a user-inputted string, try and convert it into co-ordinates using either
# MaPit if it's a postcode, or Google Maps API otherwise. Returns an array of
# data, including an error if there is one (which includes a location being in
# Northern Ireland). The information in the query may be used by cobranded versions
# of the site to diambiguate locations.
sub lookup {
my ($s, $c) = @_;
my ($latitude, $longitude, $error);
if (mySociety::Config::get('COUNTRY') eq 'GB') {
if ($s =~ /^\d+$/) {
$error = 'FixMyStreet is a UK-based website that currently works in England, Scotland, and Wales. Please enter either a postcode, or a Great British street name and area.';
} elsif (mySociety::PostcodeUtil::is_valid_postcode($s)) {
my $location = mySociety::MaPit::call('postcode', $s);
unless ($error = mapit_check_error($location)) {
$latitude = $location->{wgs84_lat};
$longitude = $location->{wgs84_lon};
}
}
} elsif (mySociety::Config::get('COUNTRY') eq 'NO') {
if ($s =~ /^\d{4}$/) {
my $location = mySociety::MaPit::call('postcode', $s);
unless ($error = mapit_check_error($location)) {
$latitude = $location->{wgs84_lat};
$longitude = $location->{wgs84_lon};
}
}
}
unless ($error || defined $latitude) {
($latitude, $longitude, $error) = FixMyStreet::Geocode::string($s, $c);
}
return ($latitude, $longitude, $error);
}
sub geocoded_string_coordinates {
my ( $js ) = @_;
my ($latitude, $longitude, $error);
my ($accuracy) = $js =~ /"Accuracy" *: *(\d)/;
if ($accuracy < 4) {
$error = _('Sorry, that location appears to be too general; please be more specific.');
} elsif ( $js =~ /"coordinates" *: *\[ *(.*?), *(.*?),/ ) {
$longitude = $1;
$latitude = $2;
if (mySociety::Config::get('COUNTRY') eq 'GB') {
try {
my ($easting, $northing) = Utils::convert_latlon_to_en( $latitude, $longitude );
} catch Error::Simple with {
mySociety::Locale::pop(); # We threw exception, so it won't have happened.
$error = shift;
$error = _('That location does not appear to be in Britain; please try again.')
if $error =~ /out of the area covered/;
}
}
}
return ($latitude, $longitude, $error);
}
sub results_check {
my $c = shift;
my ($error, @valid_locations);
foreach (@_) {
next unless /"address" *: *"(.*?)"/s;
my $address = $1;
next unless $c->cobrand->geocoded_string_check( $address );
next if $address =~ /BT\d/;
push (@$error, $address);
push (@valid_locations, $_);
}
if (scalar @valid_locations == 1) {
return geocoded_string_coordinates( $valid_locations[0] );
}
$error = _('Sorry, we could not find that location.') unless $error;
return (undef, undef, $error);
}
# string STRING QUERY
# Canonicalises, looks up on Google Maps API, and caches, a user-inputted location.
# Returns array of (LAT, LON, ERROR), where ERROR is either undef, a string, or
# an array of matches if there are more than one. The information in the query
# may be used to disambiguate the location in cobranded versions of the site.
sub string {
my ($s, $c) = @_;
$s = lc($s);
$s =~ s/[^-&\w ']/ /g;
$s =~ s/\s+/ /g;
$s = URI::Escape::uri_escape_utf8($s);
$s = $c->cobrand->disambiguate_location( "q=$s" );
$s =~ s/%20/+/g;
my $url = 'http://maps.google.com/maps/geo?' . $s;
my $cache_dir = mySociety::Config::get('GEO_CACHE');
my $cache_file = $cache_dir . md5_hex($url);
my ($js, $error);
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 ( mySociety::Config::get('COUNTRY') eq 'GB'
&& $url !~ /,\+UK/
&& $url !~ /united\++kingdom$/ )
{
if ( $url =~ /&/ ) {
$url =~ s/&/,+UK&/;
} else {
$url .= ',+UK';
}
}
$url .= '&sensor=false&key=' . mySociety::Config::get('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) {
$error = _('Sorry, we could not parse that location. Please try again.');
} elsif ($js !~ /"code" *: *200/) {
$error = _('Sorry, we could not find that location.');
} elsif ($js =~ /}, *{/) { # Multiple
return results_check($c, (split /}, *{/, $js));
} elsif ($js =~ /BT\d/) {
# Northern Ireland, hopefully
$error = _("We do not cover Northern Ireland, I'm afraid, as our licence doesn't include any maps for the region.");
} else {
return results_check($c, $js);
}
return (undef, undef, $error);
}
sub mapit_check_error {
my $location = shift;
if ($location->{error}) {
return _('That postcode was not recognised, sorry.') if $location->{code} =~ /^4/;
return $location->{error};
}
if (mySociety::Config::get('COUNTRY') eq 'GB') {
my $island = $location->{coordsyst};
if (!$island) {
return _("Sorry, that appears to be a Crown dependency postcode, which we don't cover.");
}
if ($island eq 'I') {
return _("We do not cover Northern Ireland, I'm afraid, as our licence doesn't include any maps for the region.");
}
}
return 0;
}
1;
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