###RUN_PERL: #!/usr/bin/perl

# /bsta/a
# attach.pl is generated from attach.1.pl.
#
# The attachment interface
#
# Copyright (C) 2016, 2023, 2024  Balthasar Szczepański
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;
use utf8;
# use Encode::Locale ('decode_argv');
use Encode ('encode', 'decode');

###PERL_LIB: use lib /botm/lib/bsta
use botm_common (
	'read_header_env',
	'url_query_decode',
	'read_data_file',
	'join_path',
	'merge_url',
	'open_encoded', 'stat_encoded'
);
use bsta_lib (
	'STATE',
	'merge_settings',
	'get_id', 'get_password',
	'fail_attachment', 'fail_500', 'redirect'
);

###PERL_PATH_SEPARATOR:     PATH_SEPARATOR     = /

###PERL_CGI_PATH:           CGI_PATH           = /bsta/

###PERL_DATA_PATH:          DATA_PATH          = /botm/data/bsta
###PERL_DATA_ATTACH_PATH:   DATA_ATTACH_PATH   = /botm/data/bsta/a
###PERL_DATA_SETTINGS_PATH: DATA_SETTINGS_PATH = /botm/data/bsta/settings
###PERL_DATA_STATE_PATH:    DATA_STATE_PATH    = /botm/data/bsta/state

###PERL_WWW_PATH:           WWW_PATH           = /botm/www/1190/bsta/

binmode STDIN,  ':encoding(UTF-8)';
binmode STDOUT, ':encoding(UTF-8)';
binmode STDERR, ':encoding(UTF-8)';
# decode_argv();

my $time = time();
srand ($time-$$);

my %http;
my %cgi;
my %settings;
my %state;
my %file_data;

my $method;
my $ID;
my $frame;
my $last_frame;
my $ong_state;
my $password;
my $password_ok;
my $IP;
my $try_onged;
my $buffer;
my $fh;
my $file_path;
my $file_name;
my $direct;
my $r = 0;

delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
###PERL_SET_PATH: $ENV{'PATH'} = /usr/local/bin:/usr/bin:/bin;

if ($ENV{'REQUEST_METHOD'} =~ /^(HEAD|GET|POST)$/) {
	$method = $1;
}
else{
	exit fail_method($ENV{'REQUEST_METHOD'}, 'GET, POST, HEAD');
}

%http = read_header_env(\%ENV);
%cgi = url_query_decode($ENV{'QUERY_STRING'});

if ($method eq 'POST') {
	if ($http{'content-type'} eq 'application/x-www-form-urlencoded') {
		my %cgi_post = url_query_decode( <STDIN> );
		%cgi = merge_settings(\%cgi, \%cgi_post);
	}
	# multipart not supported
	else{
		exit fail_content_type($method, $http{'content-type'});
	}
}

# print "content-type: text/plain\n\n";

$ID       = get_id(      \%cgi);
$password = get_password(\%cgi);

%settings  = read_data_file(DATA_SETTINGS_PATH());
%state     = read_data_file(DATA_STATE_PATH());
%file_data = read_data_file(DATA_ATTACH_PATH().$ID);
$frame = ($file_data{'frame'} ne '') ? int($file_data{'frame'}) : -1;
$last_frame = int($state{'last'});
$ong_state  = int($state{'state'});
$file_name  = $file_data{'filename'};

$password_ok = ($password eq $settings{'password'});

unless (
	($file_name ne '') && (
		$password_ok || (
			($ong_state >= STATE->{'waiting'}) &&
			($frame <= $last_frame) &&
			($frame >=0)
		)
	)
) {
	exit fail_attachment($method, $ID);
}

if ($file_data{'content'} ne '') {
	$direct = 1;
}
else {
	$direct = 0;
	$try_onged = (
		($ong_state >= STATE->{'waiting'}) &&
		($frame <= $last_frame) &&
		($frame >=0)
	);
	if ($try_onged) {
		$file_path = join_path(PATH_SEPARATOR(), WWW_PATH(), $file_name);
		$r = open_encoded($fh, '<' , $file_path);
		if ($r) {
			close($r);
			$file_path = merge_url(
				{'path' => CGI_PATH()},
				{'path' => $file_name}
			);
			exit redirect ($method, $file_path, 303);
		}
	}
	unless ($r) {
		$file_path = join_path(PATH_SEPARATOR(), DATA_PATH(), $file_name);
		$r = open_encoded($fh,'<', $file_path);
		unless ($r) {
			exit fail_attachment($method, $ID);
		}
	}
	unless (binmode($fh)) {
		close($fh);
		exit fail_500("Can't switch file to binary mode.");
	}
	if (my @file_info = stat_encoded($file_path)) {
		print 'Content-length: '.$file_info[7]."\n";
	}
}
print 'Content-type: '.$file_data{'content-type'}."\n";
print 'Content-disposition: attachment; filename="'.$file_name.'"'."\n";
unless ($direct) {
	unless (binmode STDOUT) {
		close($fh);
		exit fail_500("Can't switch output to binary mode.");
	}
}
print "\n";

if($method ne 'HEAD'){
	if($direct) {
		print $file_data{'content'};
	}
	else {
		while (read ($fh, $buffer, 1024)) {
			print (STDOUT $buffer);
		}
	}
}
unless ($direct) {
	close($fh);
}
