#!/usr/bin/perl -w
#
# This script is invoked when the yarrg client uploads to
# the chiark database.

# This is part of ypp-sc-tools, a set of third-party tools for assisting
# players of Yohoho Puzzle Pirates.
#
# Copyright (C) 2009 Ian Jackson <ijackson@chiark.greenend.org.uk>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Yohoho and Puzzle Pirates are probably trademarks of Three Rings and
# are used without permission.  This program is not endorsed or
# sponsored by Three Rings.

use strict (qw(vars));
use POSIX;
use MIME::Entity;

use Commods;

$CGI::POST_MAX= 3*1024*1024;

use CGI qw/:standard -private_tempfiles/;

set_ctype_utf8();

our $now= time;  defined $now or die $!;

my $re_any= "^(.*)\$";

parse_info_serverside();

sub fail ($) {
    my ($msg) = @_;
    addlog("failing $msg");
    print header(-status=>'400 Bad commodity update',
		 -type=>'text/plain',
		 -charset=>'us-ascii');
    print "Error: $msg\n";
    exit 0;
}

sub must_param ($$) {
    my ($n,$re)= @_;
    my $v= param($n);
    fail("missing form parameter $n") unless defined $v;
    fail("invalid form parameter $n ($re)") unless $v =~ m/$re/;
    return $1;
}

my %o;

my $midtmp= "_mid-pid$$.hold";
open MIDTMP, ">$midtmp" or die "$midtmp $!";
stat MIDTMP or die $!;
my $ino= (stat _)[1];
my $midino= "_mid-ino$$.hold";
rename $midtmp, $midino or die "$midtmp $midino $!";
close MIDTMP or die $!;

our $hostname= `hostname -f`; $? and die $?;  chomp $hostname or die;
our $mid= "<$now.$$.$ino\@$hostname>";
our $pwd= `pwd`; $? and die $?; chomp($pwd);
our $caller= cgi_get_caller;

sub addlog ($) {
    print LOG "$mid $caller $_[0]\n" or die $!;
    flush LOG or die $!;
}

open LOG, ">>_upload.log" or die $!;
addlog("receiving");

$o{'clientname'}= must_param('clientname',$re_any);
my $clientinfo= $clients{$o{'clientname'}};
fail('unknown client') unless defined $clientinfo;

my $clientfixes= must_param('clientfixes', "^([-0-9a-z ]*)\$");
my @clientfixes= sort grep { m/./ } split /\s+/, $clientfixes;
$o{'clientfixes'}= "@clientfixes";
foreach my $bug (@$clientinfo) {
    fail("client out of date - missing bugfix \`$bug'")
	unless grep { $_ eq $bug } @clientfixes;
}

$o{'clientversion'}= must_param('clientversion', "^(\\d[-+._0-9a-zA-Z]+)\$");

if (param('requesttimestamp')) {
    my $now= time; defined $now or die;
    print header(-type=>'text/plain', -charset=>'us-ascii'), "OK $now.\n";
    exit(0);
}

$o{'ocean'}= must_param('ocean', $re_any);
$o{'island'}= must_param('island', $re_any);

my $arches= $oceans{$o{'ocean'}};
fail("unknown ocean") unless $arches;

my $island_found= 0;
foreach my $islands (values %$arches) {
    my $sources= $islands->{$o{'island'}};
    next unless $sources;
    die if $island_found;
    $island_found= $sources;
}
fail("unknown island") unless $island_found;

$o{'timestamp'}= must_param('timestamp', "^([1-9]\\d{1,20})\$");
fail("clock skew") if $o{'timestamp'} >= $now;

my $indatafh= upload('data');
defined $indatafh or fail("data is not a file");
my $datafile= must_param('data',"^(deduped\\.tsv\\.gz)\$");

foreach my $mid (<_mid-*.hold>) {
    if (!stat $mid) { $!==&ENOENT or die "$mid $!"; next; }
    my $age= (stat _)[9];
    next if $age < 60;
    unlink $mid or $!==&ENOENT or die "$mid $!";
}

$o{'instance'}= $ENV{'YARRG_INSTANCE'};

my $mcontent= MIME::Entity->build(To => 'yarrg-commod-updates',
				  Subject => $ENV{'YARRG_INSTANCE'},
				  Type => 'multipart/mixed',
				  Boundary => '=',
				  'Message-ID' => $mid,
				  Charset => 'utf-8');

get_our_version(\%o, 'server');
foreach my $cs (qw(client server)) {
    $o{"${cs}spec"}= join "\t", map { $o{$cs.$_} } qw(name version fixes);
}

my $metadata= '';

sub ksmap ($) {
    my ($v) = @_;
    my $i=0; grep { return $i if $_ eq $v; $i++ } qw(ocean island timestamp);
    sprintf "z %d %s", (length $v) / 8, $v;
}

foreach my $vn (sort { ksmap($a) cmp ksmap($b) } keys %o) {
    my $val= $o{$vn};
    die if $val =~ m/\n|\r/;
    $metadata .= "$vn\t$o{$vn}\n";
}

my $mdpart= MIME::Entity->build(Top => 0,
				Type => 'text/plain',
				Charset => 'utf-8',
				Disposition => 'inline',
				Encoding => 'quoted-printable',
				Filename => 'metadata',
				Data => $metadata);
$mcontent->add_part($mdpart);

my $gunzchild= open(GZ, "-|"); defined $gunzchild or die $!;
if (!$gunzchild) {
    open STDIN, "<&=", $indatafh or die $!;
    exec 'gunzip'; die $!;
}

my $dedupedtsv= pipethrough_prep();

while (<GZ>) {
    my @v= check_tsv_line($_,\&fail);
    print $dedupedtsv join("\t",@v),"\n" or die $!;
}

GZ->error and die $!;
$?=0; close GZ; $? and fail("gunzip for check failed code $?");

my $launderedgz= pipethrough_run($dedupedtsv,undef,'gzip','gzip');

my $mdatafile= MIME::Entity->build(Top => 0,
				   Type => 'application/octet-stream',
				   Disposition => 'attachment',
				   Encoding => 'base64',
				   Filename => 'deduped.tsv.gz',
				   Data => $launderedgz);
$mcontent->add_part($mdatafile);

open M, "|/usr/sbin/sendmail -t -oi -oee -odb"
    or fail("fork sendmail failed! ($!)");
$mcontent->print(\*M);

M->error and fail("write sendmail failed! ($!)");
$?=0; close M; $? and fail("sendmail failed code $?");

print header(-type=>'text/plain', -charset=>'us-ascii'),
      "OK\nThank you for your submission to YARRG.\n"
    or die $!;

addlog("accepted $o{'clientspec'}");
close LOG or die $!;