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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 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 mySociety::Config;
use mySociety::GeoUtil;
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, $q) = @_;
my ($latitude, $longitude, $error);
if ($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 = Page::mapit_check_error($location)) {
$latitude = $location->{wgs84_lat};
$longitude = $location->{wgs84_lon};
}
} else {
($latitude, $longitude, $error) = FixMyStreet::Geocode::string($s, $q);
}
return ($latitude, $longitude, $error);
}
sub geocoded_string_coordinates {
my ($js, $q) = @_;
my ($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 = $2;
}
return ($latitude, $longitude, $error);
}
# string STRING QUERY
# Canonicalises, looks up on Google Maps API, and caches, a user-inputted location.
# Returns array of (TILE_X, TILE_Y, EASTING, NORTHING, ERROR), where ERROR is
# either undef, a string, or an array of matches if there are more than one. The
# information in the query may be used to disambiguate the location in cobranded versions
# of the site.
sub string {
my ($s, $q) = @_;
$s = lc($s);
$s =~ s/[^-&0-9a-z ']/ /g;
$s =~ s/\s+/ /g;
$s = URI::Escape::uri_escape_utf8($s);
$s = Cobrand::disambiguate_location(Page::get_cobrand($q), "q=$s", $q);
$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, $latitude, $longitude);
if (-s $cache_file) {
$js = File::Slurp::read_file($cache_file);
} else {
$url .= ',+UK' unless $url =~ /united\++kingdom$/ || $url =~ /uk$/i;
$url .= '&sensor=false&gl=uk&key=' . mySociety::Config::get('GOOGLE_MAPS_API_KEY');
$js = LWP::Simple::get($url);
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
my @js = split /}, *{/, $js;
my @valid_locations;
foreach (@js) {
next unless /"address" *: *"(.*?)"/s;
my $address = $1;
next unless Cobrand::geocoded_string_check(Page::get_cobrand($q), $address, $q);
next if $address =~ /BT\d/;
push (@valid_locations, $_);
push (@$error, $address);
}
if (scalar @valid_locations == 1) {
return geocoded_string_coordinates($valid_locations[0], $q);
}
$error = _('Sorry, we could not find that location.') unless $error;
} elsif ($js =~ /BT\d/) {
# Northern Ireland, hopefully
$error = _("We do not cover Northern Ireland, I'm afraid, as our licence doesn't include any maps for the region.");
} else {
($latitude, $longitude, $error) = geocoded_string_coordinates($js, $q);
}
return ($latitude, $longitude, $error);
}
# list_choices
# Prints response if there's more than one possible result
sub list_choices {
my ($choices, $page, $q) = @_;
my $url;
my $cobrand = Page::get_cobrand($q);
my $message = _('We found more than one match for that location. We show up to ten matches, please try a different search if yours is not here.');
my $out = '<p>' . $message . '</p>';
my $choice_list = '<ul>';
foreach my $choice (@$choices) {
$choice =~ s/, United Kingdom//;
$choice =~ s/, UK//;
$url = Cobrand::url($cobrand, NewURL($q, -retain => 1, -url => $page, 'pc' => $choice), $q);
$url =~ s/%20/+/g;
$choice_list .= '<li><a href="' . $url . '">' . $choice . "</a></li>\n";
}
$choice_list .= '</ul>';
$out .= $choice_list;
my %vars = (message => $message,
choice_list => $choice_list,
header => _('More than one match'),
url_home => Cobrand::url($cobrand, '/', $q));
my $cobrand_choice = Page::template_include('geocode-choice', $q, Page::template_root($q), %vars);
return $cobrand_choice if $cobrand_choice;
return $out;
}
1;
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