1 files changed, 117 insertions, 0 deletions
diff --git a/lib/DBInfoscreen/Helper/EFA.pm b/lib/DBInfoscreen/Helper/EFA.pm
new file mode 100644
index 0000000..2a7416e
--- /dev/null
+++ b/lib/DBInfoscreen/Helper/EFA.pm
@@ -0,0 +1,117 @@
+package DBInfoscreen::Helper::EFA;
+
+# Copyright (C) 2020-2022 Birte Kristina Friesel
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+use strict;
+use warnings;
+use 5.020;
+
+use DateTime;
+use Encode     qw(decode encode);
+use Mojo::JSON qw(decode_json);
+use Mojo::Promise;
+use Mojo::Util qw(url_escape);
+use XML::LibXML;
+
+sub new {
+	my ( $class, %opt ) = @_;
+
+	my $version = $opt{version};
+
+	$opt{header}
+	  = { 'User-Agent' =>
+"dbf/${version} on $opt{root_url} +https://finalrewind.org/projects/db-fakedisplay"
+	  };
+
+	return bless( \%opt, $class );
+
+}
+
+sub get_json_p {
+	my ( $self, $cache, $url ) = @_;
+
+	my $promise = Mojo::Promise->new;
+
+	if ( my $content = $cache->thaw($url) ) {
+		$self->{log}->debug("efa->get_json_p($url): cached");
+		if ( $content->{error} ) {
+			return $promise->reject( $content->{error} );
+		}
+		return $promise->resolve($content);
+	}
+
+	$self->{user_agent}->request_timeout(5)->get_p( $url => $self->{header} )
+	  ->then(
+		sub {
+			my ($tx) = @_;
+
+			if ( my $err = $tx->error ) {
+				$self->{log}->debug(
+					"efa->get_json_p($url): HTTP $err->{code} $err->{message}");
+				$cache->freeze( $url, { error => $err->{message} } );
+				$promise->reject(
+					"GET $url returned HTTP $err->{code} $err->{message}");
+				return;
+			}
+
+			my $res = $tx->res->json;
+
+			if ( not $res ) {
+				$self->{log}->debug("efa->get_json_p($url): empty response");
+				$promise->reject("GET $url returned empty response");
+				return;
+			}
+
+			$cache->freeze( $url, $res );
+
+			$promise->resolve($res);
+
+			return;
+		}
+	)->catch(
+		sub {
+			my ($err) = @_;
+			$self->{log}->debug("efa->get_json_p($url): $err");
+			$cache->freeze( $url, { error => $err } );
+			$promise->reject($err);
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+sub get_efa_occupancy {
+	my ( $self, %opt ) = @_;
+
+	my $eva      = $opt{eva};
+	my $train_no = $opt{train_no};
+	my $promise  = Mojo::Promise->new;
+
+	$self->get_json_p( $self->{realtime_cache},
+		"https://vrrf.finalrewind.org/_eva/occupancy-by-eva/${eva}.json" )
+	  ->then(
+		sub {
+			my ($utilization_json) = @_;
+
+			if ( $utilization_json->{train}{$train_no}{occupancy} ) {
+				$promise->resolve(
+					$utilization_json->{train}{$train_no}{occupancy} );
+				return;
+			}
+			$promise->reject;
+			return;
+		}
+	)->catch(
+		sub {
+			$promise->reject;
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+1;