Move HAFAS helpers to a separate helper class

1 files changed, 293 insertions, 0 deletions

diff --git a/lib/DBInfoscreen/Helper/HAFAS.pm b/lib/DBInfoscreen/Helper/HAFAS.pm
new file mode 100644
index 0000000..18a3eda
--- /dev/null
+++ b/lib/DBInfoscreen/Helper/HAFAS.pm
@@ -0,0 +1,293 @@
+package DBInfoscreen::Helper::HAFAS;
+
+use strict;
+use warnings;
+use 5.020;
+
+use DateTime;
+use Encode qw(decode encode);
+use Mojo::JSON qw(decode_json);
+use XML::LibXML;
+
+sub new {
+	my ( $class, %opt ) = @_;
+
+	my $version = $opt{version};
+
+	$opt{header}
+	  = { 'User-Agent' =>
+		  "dbf/${version} +https://finalrewind.org/projects/db-fakedisplay" };
+
+	return bless( \%opt, $class );
+
+}
+
+sub hafas_rest_req {
+	my ( $self, $cache, $url ) = @_;
+
+	if ( my $content = $cache->thaw($url) ) {
+		return $content;
+	}
+
+	my $res = eval { $self->{user_agent}->get($url)->result; };
+
+	if ($@) {
+		return;
+	}
+	if ( $res->is_error ) {
+		return;
+	}
+
+	my $json = decode_json( $res->body );
+
+	$cache->freeze( $url, $json );
+
+	return $json;
+}
+
+sub hafas_json_req {
+	my ( $self, $cache, $url ) = @_;
+
+	if ( my $content = $cache->thaw($url) ) {
+		return $content;
+	}
+
+	my $res = eval { $self->{user_agent}->get($url)->result };
+
+	if ($@) {
+		return;
+	}
+	if ( $res->is_error ) {
+		return;
+	}
+
+	my $body = encode( 'utf-8', decode( 'ISO-8859-15', $res->body ) );
+
+	$body =~ s{^TSLs[.]sls = }{};
+	$body =~ s{;$}{};
+	$body =~ s{(}{(}g;
+	$body =~ s{)}{)}g;
+
+	my $json = decode_json($body);
+
+	$cache->freeze( $url, $json );
+
+	return $json;
+}
+
+sub hafas_xml_req {
+	my ( $self, $cache, $url ) = @_;
+
+	if ( my $content = $cache->thaw($url) ) {
+		return $content;
+	}
+
+	my $res = eval { $self->{user_agent}->get($url)->result };
+
+	if ($@) {
+		return;
+	}
+	if ( $res->is_error ) {
+		$cache->freeze( $url, {} );
+		return;
+	}
+
+	my $body = decode( 'ISO-8859-15', $res->body );
+
+	# <SDay text="... &gt; ..."> is invalid HTML, but present
+	# regardless. As it is the last tag, we just throw it away.
+	$body =~ s{<SDay [^>]*/>}{}s;
+
+	my $tree;
+
+	eval { $tree = XML::LibXML->load_xml( string => $body ) };
+
+	if ($@) {
+		$cache->freeze( $url, {} );
+		return;
+	}
+
+	my $ret = {
+		station  => {},
+		stations => [],
+		messages => [],
+	};
+
+	for my $station ( $tree->findnodes('/Journey/St') ) {
+		my $name   = $station->getAttribute('name');
+		my $adelay = $station->getAttribute('adelay');
+		my $ddelay = $station->getAttribute('ddelay');
+		push( @{ $ret->{stations} }, $name );
+		$ret->{station}{$name} = {
+			adelay => $adelay,
+			ddelay => $ddelay,
+		};
+	}
+
+	for my $message ( $tree->findnodes('/Journey/HIMMessage') ) {
+		my $header  = $message->getAttribute('header');
+		my $lead    = $message->getAttribute('lead');
+		my $display = $message->getAttribute('display');
+		push(
+			@{ $ret->{messages} },
+			{
+				header  => $header,
+				lead    => $lead,
+				display => $display
+			}
+		);
+	}
+
+	$cache->freeze( $url, $ret );
+
+	return $ret;
+}
+
+sub get_route_timestamps {
+	my ( $self, %opt ) = @_;
+
+	my $base
+	  = 'https://reiseauskunft.bahn.de/bin/trainsearch.exe/dn?L=vs_json&start=yes&rt=1';
+	my ( $date_yy, $date_yyyy, $train_no, $train_origin );
+
+	if ( $opt{train} ) {
+		$date_yy      = $opt{train}->start->strftime('%d.%m.%y');
+		$date_yyyy    = $opt{train}->start->strftime('%d.%m.%Y');
+		$train_no     = $opt{train}->type . ' ' . $opt{train}->train_no;
+		$train_origin = $opt{train}->origin;
+	}
+	else {
+		my $now = DateTime->now( time_zone => 'Europe/Berlin' );
+		$date_yy   = $now->strftime('%d.%m.%y');
+		$date_yyyy = $now->strftime('%d.%m.%Y');
+		$train_no  = $opt{train_no};
+	}
+
+	my $trainsearch = $self->hafas_json_req( $self->{main_cache},
+		"${base}&date=${date_yy}&trainname=${train_no}" );
+
+	if ( not $trainsearch ) {
+		return;
+	}
+
+	# Fallback: Take first result
+	my $trainlink = $trainsearch->{suggestions}[0]{trainLink};
+
+	# Try finding a result for the current date
+	for my $suggestion ( @{ $trainsearch->{suggestions} // [] } ) {
+
+       # Drunken API, sail with care. Both date formats are used interchangeably
+		if (
+			exists $suggestion->{depDate}
+			and (  $suggestion->{depDate} eq $date_yy
+				or $suggestion->{depDate} eq $date_yyyy )
+		  )
+		{
+			# Train numbers are not unique, e.g. IC 149 refers both to the
+			# InterCity service Amsterdam -> Berlin and to the InterCity service
+			# Koebenhavns Lufthavn st -> Aarhus.  One workaround is making
+			# requests with the stationFilter=80 parameter.  Checking the origin
+			# station seems to be the more generic solution, so we do that
+			# instead.
+			if ( $train_origin and $suggestion->{dep} eq $train_origin ) {
+				$trainlink = $suggestion->{trainLink};
+				last;
+			}
+		}
+	}
+
+	if ( not $trainlink ) {
+		return;
+	}
+
+	$base = 'https://reiseauskunft.bahn.de/bin/traininfo.exe/dn';
+
+	my $traininfo = $self->hafas_json_req( $self->{realtime_cache},
+		"${base}/${trainlink}?rt=1&date=${date_yy}&L=vs_json" );
+
+	if ( not $traininfo or $traininfo->{error} ) {
+		return;
+	}
+
+	my $traindelay = $self->hafas_xml_req( $self->{realtime_cache},
+		"${base}/${trainlink}?rt=1&date=${date_yy}&L=vs_java3" );
+
+	my $ret = {};
+
+	my $strp = DateTime::Format::Strptime->new(
+		pattern   => '%d.%m.%y %H:%M',
+		time_zone => 'Europe/Berlin',
+	);
+
+	for my $station ( @{ $traininfo->{suggestions}[0]{locations} // [] } ) {
+		my $name = $station->{name};
+		my $arr  = $station->{arrDate} . ' ' . $station->{arrTime};
+		my $dep  = $station->{depDate} . ' ' . $station->{depTime};
+		$ret->{$name} = {
+			sched_arr => scalar $strp->parse_datetime($arr),
+			sched_dep => scalar $strp->parse_datetime($dep),
+		};
+		if ( exists $traindelay->{station}{$name} ) {
+			my $delay = $traindelay->{station}{$name};
+			if (    $ret->{$name}{sched_arr}
+				and $delay->{adelay}
+				and $delay->{adelay} =~ m{^\d+$} )
+			{
+				$ret->{$name}{rt_arr} = $ret->{$name}{sched_arr}
+				  ->clone->add( minutes => $delay->{adelay} );
+			}
+			if (    $ret->{$name}{sched_dep}
+				and $delay->{ddelay}
+				and $delay->{ddelay} =~ m{^\d+$} )
+			{
+				$ret->{$name}{rt_dep} = $ret->{$name}{sched_dep}
+				  ->clone->add( minutes => $delay->{ddelay} );
+			}
+		}
+	}
+
+	return ( $ret, $traindelay // {} );
+}
+
+sub get_tripid {
+	my ( $self, $train ) = @_;
+
+	my $cache = $self->{main_cache};
+	my $eva   = $train->station_uic;
+
+	my $dep_ts = DateTime->now( time_zone => 'Europe/Berlin' );
+	my $url
+	  = "https://2.db.transport.rest/stations/${eva}/departures?duration=5&when=$dep_ts";
+
+	if ( $train->sched_departure ) {
+		$dep_ts = $train->sched_departure->epoch;
+		$url
+		  = "https://2.db.transport.rest/stations/${eva}/departures?duration=5&when=$dep_ts";
+	}
+	elsif ( $train->sched_arrival ) {
+		$dep_ts = $train->sched_arrival->epoch;
+		$url
+		  = "https://2.db.transport.rest/stations/${eva}/arrivals?duration=5&when=$dep_ts";
+	}
+
+	my $json = $self->hafas_rest_req( $cache, $url );
+
+	#say "looking for " . $train->train_no . " in $url";
+	for my $result ( @{ $json // [] } ) {
+		my $trip_id = $result->{tripId};
+		my $fahrt   = $result->{line}{fahrtNr};
+
+		#say "checking $fahrt";
+		if ( $result->{line} and $result->{line}{fahrtNr} == $train->train_no )
+		{
+			#say "Trip ID is $trip_id";
+			return $trip_id;
+		}
+		else {
+			#say "unmatched Trip ID $trip_id";
+		}
+	}
+	return;
+}
+
+1;