package Travel::Status::DE::HAFAS; # vim:foldmethod=marker use strict; use warnings; use 5.014; use utf8; use Carp qw(confess); use DateTime; use DateTime::Format::Strptime; use Digest::MD5 qw(md5_hex); use Encode qw(decode encode); use JSON; use LWP::UserAgent; use Travel::Status::DE::HAFAS::Journey; use Travel::Status::DE::HAFAS::Location; use Travel::Status::DE::HAFAS::Message; use Travel::Status::DE::HAFAS::Polyline qw(decode_polyline); use Travel::Status::DE::HAFAS::StopFinder; our $VERSION = '5.04'; # {{{ Endpoint Definition my %hafas_instance = ( DB => { stopfinder => 'https://reiseauskunft.bahn.de/bin/ajax-getstop.exe', mgate => 'https://reiseauskunft.bahn.de/bin/mgate.exe', name => 'Deutsche Bahn', productbits => [qw[ice ic_ec d regio s bus ferry u tram ondemand]], salt => 'bdI8UVj4' . '0K5fvxwf', languages => [qw[de en fr es]], request => { client => { id => 'DB', v => '20100000', type => 'IPH', name => 'DB Navigator', }, ext => 'DB.R21.12.a', ver => '1.15', auth => { type => 'AID', aid => 'n91dB8Z77' . 'MLdoR0K' }, }, }, NAHSH => { mgate => 'https://nah.sh.hafas.de/bin/mgate.exe', stopfinder => 'https://nah.sh.hafas.de/bin/ajax-getstop.exe', name => 'Nahverkehrsverbund Schleswig-Holstein', productbits => [qw[ice ice ice regio s bus ferry u tram ondemand]], request => { client => { id => 'NAHSH', v => '3000700', type => 'IPH', name => 'NAHSHPROD', }, ver => '1.16', auth => { type => 'AID', aid => 'r0Ot9FLF' . 'NAFxijLW' }, }, }, NASA => { mgate => 'https://reiseauskunft.insa.de/bin/mgate.exe', stopfinder => 'https://reiseauskunft.insa.de/bin/ajax-getstop.exe', name => 'Nahverkehrsservice Sachsen-Anhalt', productbits => [qw[ice ice regio regio regio tram bus ondemand]], languages => [qw[de en]], request => { client => { id => 'NASA', v => '4000200', type => 'IPH', name => 'nasaPROD', os => 'iPhone OS 13.1.2', }, ver => '1.18', auth => { type => 'AID', aid => 'nasa-' . 'apps', }, lang => 'deu', }, }, NVV => { mgate => 'https://auskunft.nvv.de/auskunft/bin/app/mgate.exe', stopfinder => 'https://auskunft.nvv.de/auskunft/bin/jp/ajax-getstop.exe', name => 'Nordhessischer VerkehrsVerbund', productbits => [qw[ice ic_ec regio s u tram bus bus ferry ondemand regio regio]], request => { client => { id => 'NVV', v => '5000300', type => 'IPH', name => 'NVVMobilPROD_APPSTORE', os => 'iOS 13.1.2', }, ext => 'NVV.6.0', ver => '1.18', auth => { type => 'AID', aid => 'Kt8eNOH7' . 'qjVeSxNA', }, lang => 'deu', }, }, 'ÖBB' => { mgate => 'https://fahrplan.oebb.at/bin/mgate.exe', stopfinder => 'https://fahrplan.oebb.at/bin/ajax-getstop.exe', name => 'Österreichische Bundesbahnen', productbits => [qw[ice ice ice regio regio s bus ferry u tram ice ondemand ice]], request => { client => { id => 'OEBB', v => '6030600', type => 'IPH', name => 'oebbPROD-ADHOC', }, ver => '1.57', auth => { type => 'AID', aid => 'OWDL4fE4' . 'ixNiPBBm', }, lang => 'deu', }, }, VBB => { mgate => 'https://fahrinfo.vbb.de/bin/mgate.exe', stopfinder => 'https://fahrinfo.vbb.de/bin/ajax-getstop.exe', name => 'Verkehrsverbund Berlin-Brandenburg', productbits => [qw[s u tram bus ferry ice regio]], languages => [qw[de en]], request => { client => { id => 'VBB', type => 'WEB', name => 'VBB WebApp', l => 'vs_webapp_vbb', }, ext => 'VBB.1', ver => '1.33', auth => { type => 'AID', aid => 'hafas-vb' . 'b-webapp', }, lang => 'deu', }, }, VBN => { mgate => 'https://fahrplaner.vbn.de/bin/mgate.exe', stopfinder => 'https://fahrplaner.vbn.de/hafas/ajax-getstop.exe', name => 'Verkehrsverbund Bremen/Niedersachsen', productbits => [qw[ice ice regio regio s bus ferry u tram ondemand]], salt => 'SP31mBu' . 'fSyCLmNxp', micmac => 1, languages => [qw[de en]], request => { client => { id => 'VBN', v => '6000000', type => 'IPH', name => 'vbn', }, ver => '1.42', auth => { type => 'AID', aid => 'kaoxIXLn' . '03zCr2KR', }, lang => 'deu', }, }, ); # }}} # {{{ Constructors sub new { my ( $obj, %conf ) = @_; my $service = $conf{service}; my $ua = $conf{user_agent}; if ( not $ua ) { my %lwp_options = %{ $conf{lwp_options} // { timeout => 10 } }; $ua = LWP::UserAgent->new(%lwp_options); $ua->env_proxy; } if ( not( $conf{station} or $conf{journey} or $conf{journeyMatch} or $conf{geoSearch} or $conf{locationSearch} ) ) { confess( 'station / journey / journeyMatch / geoSearch / locationSearch must be specified' ); } if ( not defined $service ) { $service = $conf{service} = 'DB'; } if ( defined $service and not exists $hafas_instance{$service} ) { confess("The service '$service' is not supported"); } my $now = DateTime->now( time_zone => 'Europe/Berlin' ); my $self = { active_service => $service, arrivals => $conf{arrivals}, cache => $conf{cache}, developer_mode => $conf{developer_mode}, exclusive_mots => $conf{exclusive_mots}, excluded_mots => $conf{excluded_mots}, messages => [], results => [], station => $conf{station}, ua => $ua, now => $now, }; bless( $self, $obj ); my $req; if ( $conf{journey} ) { $req = { svcReqL => [ { meth => 'JourneyDetails', req => { jid => $conf{journey}{id}, name => $conf{journey}{name} // '0', getPolyline => $conf{with_polyline} ? \1 : \0, }, } ], %{ $hafas_instance{$service}{request} } }; } elsif ( $conf{journeyMatch} ) { $req = { svcReqL => [ { meth => 'JourneyMatch', req => { date => ( $conf{datetime} // $now )->strftime('%Y%m%d'), input => $conf{journeyMatch}, jnyFltrL => [ { type => "PROD", mode => "INC", value => $self->mot_mask } ] }, } ], %{ $hafas_instance{$service}{request} } }; } elsif ( $conf{geoSearch} ) { $req = { svcReqL => [ { cfg => { polyEnc => 'GPA' }, meth => 'LocGeoPos', req => { ring => { cCrd => { x => int( $conf{geoSearch}{lon} * 1e6 ), y => int( $conf{geoSearch}{lat} * 1e6 ), }, maxDist => -1, minDist => 0, }, locFltrL => [ { type => "PROD", mode => "INC", value => $self->mot_mask } ], getPOIs => \0, getStops => \1, maxLoc => $conf{results} // 30, } } ], %{ $hafas_instance{$service}{request} } }; } elsif ( $conf{locationSearch} ) { $req = { svcReqL => [ { cfg => { polyEnc => 'GPA' }, meth => 'LocMatch', req => { input => { loc => { type => 'S', name => $conf{locationSearch}, }, maxLoc => $conf{results} // 30, field => 'S', }, } } ], %{ $hafas_instance{$service}{request} } }; } else { my $date = ( $conf{datetime} // $now )->strftime('%Y%m%d'); my $time = ( $conf{datetime} // $now )->strftime('%H%M%S'); my $lid; if ( $self->{station} =~ m{ ^ [0-9]+ $ }x ) { $lid = 'A=1@L=' . $self->{station} . '@'; } else { $lid = 'A=1@O=' . $self->{station} . '@'; } my $maxjny = $conf{results} // 30; my $duration = $conf{lookahead} // -1; $req = { svcReqL => [ { meth => 'StationBoard', req => { type => ( $conf{arrivals} ? 'ARR' : 'DEP' ), stbLoc => { lid => $lid }, dirLoc => undef, maxJny => $maxjny, date => $date, time => $time, dur => $duration, jnyFltrL => [ { type => "PROD", mode => "INC", value => $self->mot_mask } ] }, }, ], %{ $hafas_instance{$service}{request} } }; } if ( $conf{language} ) { $req->{lang} = $conf{language}; } $self->{strptime_obj} //= DateTime::Format::Strptime->new( pattern => '%Y%m%dT%H%M%S', time_zone => 'Europe/Berlin', ); my $json = $self->{json} = JSON->new->utf8; # The JSON request is the cache key, so if we have a cache we must ensure # that JSON serialization is deterministic. if ( $self->{cache} ) { $json->canonical; } $req = $json->encode($req); $self->{post} = $req; my $url = $conf{url} // $hafas_instance{$service}{mgate}; if ( my $salt = $hafas_instance{$service}{salt} ) { if ( $hafas_instance{$service}{micmac} ) { my $mic = md5_hex( $self->{post} ); my $mac = md5_hex( $mic . $salt ); $url .= "?mic=$mic&mac=$mac"; } else { $url .= '?checksum=' . md5_hex( $self->{post} . $salt ); } } if ( $conf{async} ) { $self->{url} = $url; return $self; } if ( $conf{json} ) { $self->{raw_json} = $conf{json}; } else { if ( $self->{developer_mode} ) { say "requesting $req from $url"; } my ( $content, $error ) = $self->post_with_cache($url); if ($error) { $self->{errstr} = $error; return $self; } if ( $self->{developer_mode} ) { say decode( 'utf-8', $content ); } $self->{raw_json} = $json->decode($content); } $self->check_mgate; if ( $conf{journey} ) { $self->parse_journey; } elsif ( $conf{journeyMatch} ) { $self->parse_journey_match; } elsif ( $conf{geoSearch} or $conf{locationSearch} ) { $self->parse_search; } else { $self->parse_board; } return $self; } sub new_p { my ( $obj, %conf ) = @_; my $promise = $conf{promise}->new; if ( not( $conf{station} or $conf{journey} or $conf{journeyMatch} or $conf{geoSearch} or $conf{locationSearch} ) ) { return $promise->reject( 'station / journey / journeyMatch / geoSearch / locationSearch flag must be passed' ); } my $self = $obj->new( %conf, async => 1 ); $self->{promise} = $conf{promise}; $self->post_with_cache_p( $self->{url} )->then( sub { my ($content) = @_; $self->{raw_json} = $self->{json}->decode($content); $self->check_mgate; if ( $conf{journey} ) { $self->parse_journey; } elsif ( $conf{journeyMatch} ) { $self->parse_journey_match; } elsif ( $conf{geoSearch} or $conf{locationSearch} ) { $self->parse_search; } else { $self->parse_board; } if ( $self->errstr ) { $promise->reject( $self->errstr, $self ); } else { $promise->resolve($self); } return; } )->catch( sub { my ($err) = @_; $promise->reject($err); return; } )->wait; return $promise; } # }}} # {{{ Internal Helpers sub mot_mask { my ($self) = @_; my $service = $self->{active_service}; my $mot_mask = 2**@{ $hafas_instance{$service}{productbits} } - 1; my %mot_pos; for my $i ( 0 .. $#{ $hafas_instance{$service}{productbits} } ) { $mot_pos{ $hafas_instance{$service}{productbits}[$i] } = $i; } if ( my @mots = @{ $self->{exclusive_mots} // [] } ) { $mot_mask = 0; for my $mot (@mots) { if ( exists $mot_pos{$mot} ) { $mot_mask |= 1 << $mot_pos{$mot}; } } } if ( my @mots = @{ $self->{excluded_mots} // [] } ) { for my $mot (@mots) { if ( exists $mot_pos{$mot} ) { $mot_mask &= ~( 1 << $mot_pos{$mot} ); } } } return $mot_mask; } sub post_with_cache { my ( $self, $url ) = @_; my $cache = $self->{cache}; if ( $self->{developer_mode} ) { say "POST $url"; } if ($cache) { my $content = $cache->thaw( $self->{post} ); if ($content) { if ( $self->{developer_mode} ) { say ' cache hit'; } return ( ${$content}, undef ); } } if ( $self->{developer_mode} ) { say ' cache miss'; } my $reply = $self->{ua}->post( $url, 'Content-Type' => 'application/json', Content => $self->{post} ); if ( $reply->is_error ) { return ( undef, $reply->status_line ); } my $content = $reply->content; if ($cache) { say "freeeez"; $cache->freeze( $self->{post}, \$content ); } return ( $content, undef ); } sub post_with_cache_p { my ( $self, $url ) = @_; my $cache = $self->{cache}; if ( $self->{developer_mode} ) { say "POST $url"; } my $promise = $self->{promise}->new; if ($cache) { my $content = $cache->thaw( $self->{post} ); if ($content) { if ( $self->{developer_mode} ) { say ' cache hit'; } return $promise->resolve( ${$content} ); } } if ( $self->{developer_mode} ) { say ' cache miss'; } $self->{ua}->post_p( $url, $self->{post} )->then( sub { my ($tx) = @_; if ( my $err = $tx->error ) { $promise->reject( "POST $url returned HTTP $err->{code} $err->{message}"); return; } my $content = $tx->res->body; if ($cache) { $cache->freeze( $self->{post}, \$content ); } $promise->resolve($content); return; } )->catch( sub { my ($err) = @_; $promise->reject($err); return; } )->wait; return $promise; } sub check_mgate { my ($self) = @_; if ( $self->{raw_json}{err} and $self->{raw_json}{err} ne 'OK' ) { $self->{errstr} = $self->{raw_json}{errTxt} // 'error code is ' . $self->{raw_json}{err}; $self->{errcode} = $self->{raw_json}{err}; } elsif ( defined $self->{raw_json}{cInfo}{code} and $self->{raw_json}{cInfo}{code} ne 'OK' and $self->{raw_json}{cInfo}{code} ne 'VH' ) { $self->{errstr} = 'cInfo code is ' . $self->{raw_json}{cInfo}{code}; $self->{errcode} = $self->{raw_json}{cInfo}{code}; } elsif ( @{ $self->{raw_json}{svcResL} // [] } == 0 ) { $self->{errstr} = 'svcResL is empty'; } elsif ( $self->{raw_json}{svcResL}[0]{err} ne 'OK' ) { $self->{errstr} = 'svcResL[0].err is ' . $self->{raw_json}{svcResL}[0]{err}; $self->{errcode} = $self->{raw_json}{svcResL}[0]{err}; } return $self; } sub add_message { my ( $self, $json, $is_him ) = @_; my $text = $json->{txtN}; my $code = $json->{code}; if ($is_him) { $text = $json->{text}; $code = $json->{hid}; } # Some backends use remL for operator information. We don't want that. if ( $code eq 'OPERATOR' ) { return; } for my $message ( @{ $self->{messages} } ) { if ( $code eq $message->{code} and $text eq $message->{text} ) { $message->{ref_count}++; return $message; } } my $message = Travel::Status::DE::HAFAS::Message->new( json => $json, is_him => $is_him, ref_count => 1, ); push( @{ $self->{messages} }, $message ); return $message; } sub parse_search { my ($self) = @_; $self->{results} = []; if ( $self->{errstr} ) { return $self; } my @locL = @{ $self->{raw_json}{svcResL}[0]{res}{locL} // [] }; if ( $self->{raw_json}{svcResL}[0]{res}{match} ) { @locL = @{ $self->{raw_json}{svcResL}[0]{res}{match}{locL} // [] }; } @{ $self->{results} } = map { Travel::Status::DE::HAFAS::Location->new( loc => $_ ) } @locL; return $self; } sub parse_journey { my ($self) = @_; if ( $self->{errstr} ) { return $self; } my @locL = map { Travel::Status::DE::HAFAS::Location->new( loc => $_ ) } @{ $self->{raw_json}{svcResL}[0]{res}{common}{locL} // [] }; my $journey = $self->{raw_json}{svcResL}[0]{res}{journey}; my @polyline; if ( $journey->{poly} ) { @polyline = decode_polyline( $journey->{poly}{crdEncYX} ); for my $ref ( @{ $journey->{poly}{ppLocRefL} // [] } ) { my $poly = $polyline[ $ref->{ppIdx} ]; my $loc = $locL[ $ref->{locX} ]; $poly->{name} = $loc->name; $poly->{eva} = $loc->eva; } } $self->{result} = Travel::Status::DE::HAFAS::Journey->new( common => $self->{raw_json}{svcResL}[0]{res}{common}, locL => \@locL, journey => $journey, polyline => \@polyline, hafas => $self, ); return $self; } sub parse_journey_match { my ($self) = @_; $self->{results} = []; if ( $self->{errstr} ) { return $self; } my @locL = map { Travel::Status::DE::HAFAS::Location->new( loc => $_ ) } @{ $self->{raw_json}{svcResL}[0]{res}{common}{locL} // [] }; my @jnyL = @{ $self->{raw_json}{svcResL}[0]{res}{jnyL} // [] }; for my $result (@jnyL) { push( @{ $self->{results} }, Travel::Status::DE::HAFAS::Journey->new( common => $self->{raw_json}{svcResL}[0]{res}{common}, locL => \@locL, journey => $result, hafas => $self, ) ); } return $self; } sub parse_board { my ($self) = @_; $self->{results} = []; if ( $self->{errstr} ) { return $self; } my @locL = map { Travel::Status::DE::HAFAS::Location->new( loc => $_ ) } @{ $self->{raw_json}{svcResL}[0]{res}{common}{locL} // [] }; my @jnyL = @{ $self->{raw_json}{svcResL}[0]{res}{jnyL} // [] }; for my $result (@jnyL) { push( @{ $self->{results} }, Travel::Status::DE::HAFAS::Journey->new( common => $self->{raw_json}{svcResL}[0]{res}{common}, locL => \@locL, journey => $result, hafas => $self, ) ); } return $self; } # }}} # {{{ Public Functions sub errcode { my ($self) = @_; return $self->{errcode}; } sub errstr { my ($self) = @_; return $self->{errstr}; } sub similar_stops { my ($self) = @_; my $service = $self->{active_service}; if ( $service and exists $hafas_instance{$service}{stopfinder} ) { my $sf = Travel::Status::DE::HAFAS::StopFinder->new( url => $hafas_instance{$service}{stopfinder}, input => $self->{station}, ua => $self->{ua}, developer_mode => $self->{developer_mode}, ); if ( my $err = $sf->errstr ) { $self->{errstr} = $err; return; } return $sf->results; } return; } sub similar_stops_p { my ( $self, %opt ) = @_; my $service = $self->{active_service}; if ( $service and exists $hafas_instance{$service}{stopfinder} ) { $opt{user_agent} //= $self->{ua}; $opt{promise} //= $self->{promise}; return Travel::Status::DE::HAFAS::StopFinder->new_p( url => $hafas_instance{$service}{stopfinder}, input => $self->{station}, user_agent => $opt{user_agent}, developer_mode => $self->{developer_mode}, promise => $opt{promise}, ); } return $opt{promise} ->reject("stopfinder not available for backend '$service'"); } sub station { my ($self) = @_; if ( $self->{station_info} ) { return $self->{station_info}; } # no need to use Location instances here my @locL = @{ $self->{raw_json}{svcResL}[0]{res}{common}{locL} // [] }; my %prefc_by_loc; for my $i ( 0 .. $#locL ) { my $loc = $locL[$i]; if ( $loc->{pRefL} ) { $prefc_by_loc{$i} = $#{ $loc->{pRefL} }; } } my @prefcounts = sort { $b->[0] <=> $a->[0] } map { [ $_, $prefc_by_loc{$_} ] } keys %prefc_by_loc; my $loc = $locL[ $prefcounts[0][0] ]; if ($loc) { $self->{station_info} = { name => $loc->{name}, eva => $loc->{extId}, names => [ map { $locL[ $_->[0] ]{name} } @prefcounts ], evas => [ map { $locL[ $_->[0] ]{extId} } @prefcounts ], }; } else { $self->{station_info} = {}; } return $self->{station_info}; } sub messages { my ($self) = @_; return @{ $self->{messages} }; } sub results { my ($self) = @_; return @{ $self->{results} }; } sub result { my ($self) = @_; return $self->{result}; } # static sub get_services { my @services; for my $service ( sort keys %hafas_instance ) { my %desc = %{ $hafas_instance{$service} }; $desc{shortname} = $service; push( @services, \%desc ); } return @services; } # static sub get_service { my ($service) = @_; if ( defined $service and exists $hafas_instance{$service} ) { return $hafas_instance{$service}; } return; } sub get_active_service { my ($self) = @_; if ( defined $self->{active_service} ) { return $hafas_instance{ $self->{active_service} }; } return; } # }}} 1; __END__ =head1 NAME Travel::Status::DE::HAFAS - Interface to HAFAS-based online arrival/departure monitors =head1 SYNOPSIS use Travel::Status::DE::HAFAS; my $status = Travel::Status::DE::HAFAS->new( station => 'Essen Hbf', ); if (my $err = $status->errstr) { die("Request error: ${err}\n"); } for my $departure ($status->results) { printf( "At %s: %s to %s from platform %s\n", $departure->time, $departure->line, $departure->destination, $departure->platform, ); } =head1 VERSION version 5.04 =head1 DESCRIPTION Travel::Status::DE::HAFAS is an interface to HAFAS-based arrival/departure monitors using the mgate.exe interface. It can report departures/arrivals at a specific station, search for stations, or provide details about a specific journey. It supports non-blocking operation via promises. =head1 METHODS =over =item my $status = Travel::Status::DE::HAFAS->new(I<%opt>) Requests item(s) as specified by I and returns a new Travel::Status::DE::HAFAS element with the results. Dies if the wrong I were passed. I must contain either a B, B, B, B, or B flag: =over =item B => I Request station board (arrivals or departures) for I, e.g. "Essen HBf" or "Alfredusbad, Essen (Ruhr)". The station must be specified either by name or by EVA ID (e.g. 8000080 for Dortmund Hbf). Results are available via C<< $status->results >>. =item B => B<{> B => I, B => I B<}> Search for stations near I, I. Results are available via C<< $status->results >>. =item B => I Search for stations whose name is similar to I. Results are available via C<< $status->results >>. =item B => B<{> B => I [, B => I ] B<}> Request details about the journey identified by I and I. The result is available via C<< $status->result >>. =item B => I Request journeys that match I (e.g. "ICE 205" or "S 31111"). Results are available via C<< $status->results >>. In contrast to B, the results typically only contain a minimal amount of information: trip ID, train/line identifier, and first and last stop. There is no real-time data. =back The following optional flags may be set. Values in brackets indicate flags that are only relevant in certain request modes, e.g. geoSearch or journey. =over =item B => I (station) Request arrivals (if I is true) rather than departures (if I is false or B is not specified). =item B => I Store HAFAS replies in the provided cache object. This module works with real-time data, so the object should be configured for an expiry of one to two minutes. =item B => I (station) Date and time to report for. Defaults to now. =item B => [I, I, ...] (geoSearch, station, journeyMatch) By default, all modes of transport (trains, trams, buses etc.) are returned. If this option is set, all modes appearing in I, I, ... will be excluded. The supported modes depend on B, use B or B to get the supported values. =item B => [I, I, ...] (geoSearch, station, journeyMatch) If this option is set, only the modes of transport appearing in I, I, ... will be returned. The supported modes depend on B, use B or B to get the supported values. =item B => I Request text messages to be provided in I. Supported languages depend on B, use B or B to get the supported values. Providing an unsupported or invalid value may lead to garbage output. =item B => I (station) Request arrivals/departures that occur up to I minutes after the specified datetime. Default: -1 (do not limit results by time). =item B => I<\%hashref> Passed on to C<< LWP::UserAgent->new >>. Defaults to C<< { timeout => 10 } >>, pass an empty hashref to call the LWP::UserAgent constructor without arguments. =item B => I (geoSearch, locationSearch, station) Request up to I results. Default: 30. =item B => I Request results from I, defaults to "DB". See B (and C<< hafas-m --list >>) for a list of supported services. =item B => I (journey) Request a polyline (series of geo-coordinates) indicating the train's route. =back =item my $status_p = Travel::Status::DE::HAFAS->new_p(I<%opt>) Returns a promise that resolves into a Travel::Status::DE::HAFAS instance ($status) on success and rejects with an error message on failure. If the failure occured after receiving a response from the HAFAS backend, the rejected promise contains a Travel::Status::DE::HAFAS instance as a second argument. This instance can be used e.g. to call similar_stops_p in case of an ambiguous location specifier. In addition to the arguments of B, the following mandatory arguments must be set. =over =item B => I Promises implementation to use for internal promises as well as B return value. Recommended: Mojo::Promise(3pm). =item B => I User agent instance to use for asynchronous requests. The object must implement a B function. Recommended: Mojo::UserAgent(3pm). =back =item $status->errcode In case of an error in the HAFAS backend, returns the corresponding error code as string. If no backend error occurred, returns undef. =item $status->errstr In case of an error in the HTTP request or HAFAS backend, returns a string describing it. If no error occurred, returns undef. =item $status->results (geoSearch, locationSearch) Returns a list of stop locations. Each list element is a Travel::Status::DE::HAFAS::Location(3pm) object. If no matching results were found or the parser / http request failed, returns an empty list. =item $status->results (station) Returns a list of arrivals/departures. Each list element is a Travel::Status::DE::HAFAS::Journey(3pm) object. If no matching results were found or the parser / http request failed, returns undef. =item $status->results (journeyMatch) Returns a list of Travel::Status::DE::HAFAS::Journey(3pm) object that describe matching journeys. In general, these objects lack real-time data, intermediate stops, and more. =item $status->result (journey) Returns a single Travel::Status::DE::HAFAS::Journey(3pm) object that describes the requested journey. If no result was found or the parser / http request failed, returns undef. =item $status->messages Returns a list of Travel::Status::DE::HAFAS::Message(3pm) objects with service messages. Each message belongs to at least one arrival/departure. =item $status->station Returns a hashref describing the departure stations in all requested journeys. The hashref contains four entries: B (station names), B (most common name), B (UIC / EVA IDs), and B (most common UIC / EVA ID). These are subject to change. Note that the most common name and ID may be different from the station for which departures were requested, as HAFAS uses different identifiers for train stations, bus stops, and other modes of transit even if they are interlinked. Not available in journey mode. =item $status->similar_stops Returns a list of hashrefs describing stops whose name is similar to the one requested in the constructor's B parameter. Returns nothing if the active service does not support this feature. This is most useful if B returns 'LOCATION', which means that the HAFAS backend could not identify the stop. See Travel::Status::DE::HAFAS::StopFinder(3pm)'s B method for details on the return value. =item $status->similar_stops_p(I<%opt>) Returns a promise resolving to a list of hashrefs describing stops whose name is similar to the one requested in the constructor's B parameter. Returns nothing if the active service does not support this feature. This is most useful if B returns 'LOCATION', which means that the HAFAS backend could not identify the stop. See Travel::Status::DE::HAFAS::StopFinder(3pm)'s B method for details on the resolved values. If $status has been created using B, this function does not require arguments. Otherwise, the caller must specify B and B (see B above). =item $status->get_active_service Returns a hashref describing the active service when a service is active and nothing otherwise. The hashref contains the keys B (URL to the station board service), B (URL to the stopfinder service, if supported), B, and B (arrayref describing the supported modes of transport, may contain duplicates). =item Travel::Status::DE::HAFAS::get_services() Returns an array containing all supported HAFAS services. Each element is a hashref and contains all keys mentioned in B. It also contains a B key, which is the service name used by the constructor's B parameter. =item Travel::Status::DE::HAFAS::get_service(I<$service>) Returns a hashref describing the service I<$service>. Returns nothing if I<$service> is not supported. See B for the hashref layout. =back =head1 DIAGNOSTICS None. =head1 DEPENDENCIES =over =item * Class::Accessor(3pm) =item * DateTime(3pm) =item * DateTime::Format::Strptime(3pm) =item * LWP::UserAgent(3pm) =back =head1 BUGS AND LIMITATIONS The non-default services (anything other than DB) are not well tested. =head1 SEE ALSO Travel::Status::DE::HAFAS::Journey(3pm), Travel::Status::DE::HAFAS::StopFinder(3pm). =head1 AUTHOR Copyright (C) 2015-2023 by Birte Kristina Friesel Ederf@finalrewind.orgE =head1 LICENSE This module is licensed under the same terms as Perl itself.