#!/usr/bin/env perl

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use strict;
use warnings;

use Getopt::Long;
use FindBin;
use Pod::Usage;
use File::Spec::Functions qw(rel2abs);

my %opt = (
    root => ($ENV{RTHOME} || "/opt/rt5"),

    fcgid   => 0,
    fastcgi => 0,
    perl    => 0,

    modules => "/usr/lib/apache2/modules",
);

GetOptions(  \%opt,
    "root=s",

    "rt3|3!",

    "fcgid!",
    "fastcgi!",
    "perl!",

    "port|p=i",
    "ssl:i",
    "single|X",
    "auth|A:s",

    "modules=s",

    "help|h|?",
) or pod2usage( 1 );
pod2usage( {verbose => 2} ) if $opt{help};

# All paths must be absolute
$opt{$_} = rel2abs($opt{$_})
    for qw(root modules);

# Determine what module to use
my $mod;
if ($opt{fcgid} + $opt{fastcgi} + $opt{perl} > 1) {
    die "Can only supply one of fcgid, fastcgi, or perl\n";
} elsif ($opt{fcgid} + $opt{fastcgi} + $opt{perl} == 0) {
    my @guess = qw(fastcgi fcgid perl);
    @guess = grep {-f "$opt{modules}/mod_$_.so"} @guess;
    die "Neither mod_fcgid, mod_fastcgi, nor mod_perl are installed; aborting\n"
        unless @guess;
    warn "No deployment given -- assuming mod_$guess[0] deployment\n";
    $mod = $guess[0];
} else {
    $mod = (grep {$opt{$_}} qw(fastcgi fcgid perl))[0];
}

# Sanity check that the root contains an RT install
die "$opt{root} doesn't look like an RT install\n"
    unless -e "$opt{root}/lib/RT.pm";

# Detect if we are actually rt3
if (not -e "$opt{root}/sbin/rt-server.fcgi"
        and -e "$opt{root}/bin/mason_handler.fcgi") {
    $opt{rt3}++;
    warn "RT3 install detected!\n";
}

# Parse etc/RT_SiteConfig.pm for the default port
my $RTCONF;
$opt{port} ||= parseconf( "WebPort" );
unless ($opt{port}) {
    warn "Defaulting to port 8888\n";
    $opt{port} = 8888;
}

# Set ssl port if they want it but didn't provide a number
$opt{ssl} = 4430 if defined $opt{ssl} and not $opt{ssl};

# Default auth to on if they set $WebRemoteUserAuth
$opt{auth} = '' if not exists $opt{auth} and parseconf( "WebRemoteUserAuth" );

# Set an auth path if they want it but didn't pass a path
if (defined $opt{auth} and not $opt{auth}) {
    $opt{auth} = "$opt{root}/var/htpasswd";
    unless (-f $opt{auth}) {
        open(my $fh, ">", $opt{auth}) or die "Can't create default htpasswd: $!";
        print $fh 'root:$apr1$TZA4Y0DL$DS5ZhDH8QrhB.uAtvNJmh.' . "\n";
        close $fh or die "Can't create default htpasswd: $!";
    }
} elsif ($opt{auth} and not -f $opt{auth}) {
    die "Can't read htpasswd file $opt{auth}!";
}

# Parse out the WebPath
my $path = parseconf( "WebPath" ) || "";

my $template = join("", <DATA>);
$template =~ s/\$PORT/$opt{port}/g;
$template =~ s!\$PATH/!$path/!g;
$template =~ s!\$PATH!$path || "/"!ge;
$template =~ s/\$SSL/$opt{ssl} || 0/ge;
$template =~ s/\$AUTH/$opt{auth}/ge;
$template =~ s/\$RTHOME/$opt{root}/g;
$template =~ s/\$MODULES/$opt{modules}/g;
$template =~ s/\$TOOLS/$FindBin::Bin/g;
$template =~ s/\$PROCESSES/$opt{single} ? 1 : 3/ge;

my $conf = "$opt{root}/var/apache.conf";
open(CONF, ">", $conf)
    or die "Can't write $conf: $!";
print CONF $template;
close CONF;

my @opts = ("-f", $conf, "-D" . uc($mod) );
push @opts, "-DSSL" if $opt{ssl};
push @opts, "-DRT3" if $opt{rt3};
push @opts, "-DSINGLE" if $opt{single};
push @opts, "-DREDIRECT" if $path;
push @opts, "-DAUTH" if $opt{auth};

# Wait for a previous run to terminate
if ( open( PIDFILE, "<", "$opt{root}/var/apache2.pid") ) {
    my $pid = <PIDFILE>;
    chomp $pid;
    close PIDFILE;
    if ($pid and kill 0, $pid) {
        warn "Waiting for previous run (pid $pid) to finish...\n";
        sleep 1 while kill 0, $pid;
    }
}

# Clean out the log in preparation
my $log = "$opt{root}/var/log/apache-error.log";
unlink($log);

# Start 'er up
warn "Starting apache server on http://localhost:$opt{port}$path/"
    . ($opt{ssl} ? " and https://localhost:$opt{ssl}$path/" : "") . "\n";
!system("apache2", @opts, "-k", "start")
    or die "Can't exec apache2: $@";
# Ignore the return value, as we expect it to be ^C'd
system("tail", "-f", $log);
warn "Shutting down apache...\n";
!system("apache2", @opts, "-k", "stop")
    or die "Can't exec apache2: $@";


sub parseconf {
    my ($optname) = @_;
    # We're going to be evil, and try to parse the config
    unless (defined $RTCONF) {
        unless ( open(CONF, "<", "$opt{root}/etc/RT_SiteConfig.pm") ) {
            warn "Can't open $opt{root}/etc/RT_SiteConfig.pm: $!\n";
            $RTCONF = "";
            return;
        }
        $RTCONF = join("", <CONF>);
        close CONF;
    }

    return unless $RTCONF =~ /^\s*Set\(\s*\$$optname\s*(?:,|=>)\s*['"]?(.*?)['"]?\s*\)/m;
    return $1;
}

=head1 NAME

rt-apache - Wrapper to start Apache running RT

=head1 DESCRIPTION

This script exists to make it easier to run RT under Apache for testing.
It is not intended as a way to deploy RT, or to provide example Apache
configuration for RT.  For instructions on how to deploy RT with Apache,
please read the provided F<docs/web_deployment.pod> file.

Running this script will start F<apache2> with a custom-built
configuration file, built based on command-line options and the contents
of your F<RT_SiteConfig.pm>.  It will work with either RT 3.8.x or RT
4.0.x.  As it is primarily for simple testing, it runs Apache as the
current user.

=head1 OPTIONS

C<rt-apache> will parse your F<RT_SiteConfig.pm> for its C<WebPath> and
C<WebPort> configuration, and adjust its defaults accordingly.

=over

=item --root B<path>

The path to the RT install to serve.  This defaults to the C<RTHOME>
environment variable, or C</opt/rt5>.

=item --fastcgi, --fcgid, --perl

Determines the Apache module which is used.  By default, the first one
of that list which exists will be used.  See also L</--modules>.

=item --port B<number>, -p

Chooses the port to listen on.  By default, this is parsed from the
F<RT_SiteConfig.pm>, and falling back to 8888.

=item --ssl [B<number>]

Also listens on the provided port with HTTPS, using a self-signed
certificate for C<localhost>.  If the port number is not specified,
defaults to port 4430.

=item --auth [F</path/to/htpasswd>], -A

Turns on HTTP Basic Authentication; this is done automatically if
C<$WebRemoteUserAuth> is set in the F<RT_SiteConfig.pm>.  The provided
path should be to a F<htpasswd> file; if not given, defaults to a file
containing only user C<root> with password C<password>.

=item --single, -X

Run only one process or thread, for ease of debugging.

=item --rt3, -3

Declares that the RT install in question is RT 3.8.x.  C<rt-apache> can
usually detect this for you, however.

=item --modules B<path>

The path to the Apache2 modules directory, which is expected to contain
at least one of F<mod_fcgid.so>, F<mod_fastcgi.so>, or F<mod_perl.so>.
Defaults to F</usr/lib/apache2/modules>.

=back

=cut

__DATA__
Listen $PORT
<IfDefine SSL>
   Listen $SSL
</IfDefine>

ServerName localhost
ServerRoot $RTHOME/var
PidFile    $RTHOME/var/apache2.pid
<IfVersion < 2.4>
    LockFile   $RTHOME/var/apache2.lock
</IfVersion>
ServerAdmin root@localhost

<IfVersion >= 2.4>
    LoadModule mpm_prefork_module $MODULES/mod_mpm_prefork.so
    LoadModule authz_core_module $MODULES/mod_authz_core.so
</IfVersion>
LoadModule authz_host_module  $MODULES/mod_authz_host.so
LoadModule env_module         $MODULES/mod_env.so
LoadModule alias_module       $MODULES/mod_alias.so
LoadModule mime_module        $MODULES/mod_mime.so
TypesConfig $TOOLS/mime.types

<IfDefine SINGLE>
    <IfModule mpm_prefork_module>
        StartServers          1
        MinSpareServers       1
        MaxSpareServers       1
        MaxClients            1
        MaxRequestsPerChild   0
    </IfModule>

    <IfModule mpm_worker_module>
        StartServers          1
        MinSpareThreads       1
        MaxSpareThreads       1
        ThreadLimit           1
        ThreadsPerChild       1
        MaxClients            1
        MaxRequestsPerChild   0
    </IfModule>
</IfDefine>

<IfDefine PERL>
    LoadModule perl_module    $MODULES/mod_perl.so
</IfDefine>
<IfDefine FASTCGI>
    LoadModule fastcgi_module $MODULES/mod_fastcgi.so
</IfDefine>
<IfDefine FCGID>
    LoadModule fcgid_module   $MODULES/mod_fcgid.so
</IfDefine>
<IfDefine SSL>
    LoadModule ssl_module     $MODULES/mod_ssl.so
    <IfVersion >= 2.4>
        LoadModule socache_shmcb_module $MODULES/mod_socache_shmcb.so
    </IfVersion>
</IfDefine>

<IfModule !log_config_module>
    LoadModule log_config_module $MODULES/mod_log_config.so
</IfModule>
ErrorLog    "$RTHOME/var/log/apache-error.log"
TransferLog "$RTHOME/var/log/apache-access.log"
LogLevel notice

<Directory />
    Options FollowSymLinks
    AllowOverride None
    <IfVersion >= 2.4>
        Require all denied
    </IfVersion>
    <IfVersion < 2.4>
        Order deny,allow
        Deny from all
    </IfVersion>
</Directory>

AddDefaultCharset UTF-8

<IfDefine REDIRECT>
    LoadModule rewrite_module $MODULES/mod_rewrite.so
    RewriteEngine on
    RewriteRule ^(?!\Q$PATH\E) - [R=404]
</IfDefine>

<IfDefine AUTH>
    <IfVersion >= 2.4>
        LoadModule authn_core_module $MODULES/mod_authn_core.so
    </IfVersion>
    LoadModule auth_basic_module $MODULES/mod_auth_basic.so
    LoadModule authn_file_module $MODULES/mod_authn_file.so
    LoadModule authz_user_module $MODULES/mod_authz_user.so
    <Location $PATH>
        Require valid-user
        AuthType basic
        AuthName "RT access"
        AuthBasicProvider file
        AuthUserFile $AUTH
    </Location>
    <Location $PATH/REST/1.0/NoAuth/mail-gateway>
        <IfVersion >= 2.4>
            Require local
        </IfVersion>
        <IfVersion < 2.4>
            Order deny,allow
            Deny from all
            Allow from localhost
            Satisfy any
        </IfVersion>
    </Location>
</IfDefine>
<IfDefine !AUTH>
    <Location $PATH>
        <IfVersion >= 2.4>
            Require all granted
        </IfVersion>
        <IfVersion < 2.4>
            Order allow,deny
            Allow from all
        </IfVersion>
    </Location>
</IfDefine>

<IfDefine !RT3>
########## 4.0 mod_perl
<IfDefine PERL>
    PerlSetEnv RT_SITE_CONFIG $RTHOME/etc/RT_SiteConfig.pm
    <Location $PATH>
        SetHandler modperl
        PerlResponseHandler Plack::Handler::Apache2
        PerlSetVar psgi_app $RTHOME/sbin/rt-server
    </Location>
    <Perl>
        use Plack::Handler::Apache2;
        Plack::Handler::Apache2->preload("$RTHOME/sbin/rt-server");
    </Perl>
</IfDefine>

########## 4.0 mod_fastcgi
<IfDefine FASTCGI>
    FastCgiIpcDir $RTHOME/var
    FastCgiServer $RTHOME/sbin/rt-server.fcgi -processes $PROCESSES -idle-timeout 300
    ScriptAlias $PATH $RTHOME/sbin/rt-server.fcgi/
    <Location $PATH>
        Options +ExecCGI
        AddHandler fastcgi-script fcgi
    </Location>
</IfDefine>

########## 4.0 mod_fcgid
<IfDefine FCGID>
    FcgidProcessTableFile $RTHOME/var/fcgid_shm
    FcgidIPCDir $RTHOME/var
    FcgidMaxRequestLen 1073741824
    ScriptAlias $PATH $RTHOME/sbin/rt-server.fcgi/
    <Location $PATH>
        Options +ExecCGI
        AddHandler fcgid-script fcgi
    </Location>
</IfDefine>
</IfDefine>


<IfDefine RT3>
########## 3.8 mod_perl
<IfDefine PERL>
    PerlSetEnv RT_SITE_CONFIG $RTHOME/etc/RT_SiteConfig.pm
    PerlRequire "$RTHOME/bin/webmux.pl"
    <Location $PATH/NoAuth/images>
        SetHandler default
    </Location>
    <Location $PATH>
        SetHandler perl-script
        PerlResponseHandler RT::Mason
    </Location>
</IfDefine>

########## 3.8 mod_fastcgi
<IfDefine FASTCGI>
    FastCgiIpcDir $RTHOME/var
    FastCgiServer $RTHOME/bin/mason_handler.fcgi -processes $PROCESSES -idle-timeout 300
    ScriptAlias $PATH $RTHOME/bin/mason_handler.fcgi/
    <Location $PATH>
        Options +ExecCGI
        AddHandler fastcgi-script fcgi
    </Location>
</IfDefine>

########## 3.8 mod_fcgid
<IfDefine FCGID>
    FcgidProcessTableFile $RTHOME/var/fcgid_shm
    FcgidIPCDir $RTHOME/var
    FcgidMaxRequestLen 1073741824
    ScriptAlias $PATH $RTHOME/bin/mason_handler.fcgi/
    <Location $PATH>
        Options +ExecCGI
        AddHandler fcgid-script fcgi
    </Location>
</IfDefine>
</IfDefine>

<IfDefine SSL>
    SSLRandomSeed startup builtin
    SSLRandomSeed startup file:/dev/urandom 512
    SSLRandomSeed connect builtin
    SSLRandomSeed connect file:/dev/urandom 512
    SSLSessionCache shmcb:$RTHOME/var/ssl_scache(512000)
    <IfVersion < 2.4>
        SSLMutex file:$RTHOME/var/ssl_mutex
    </IfVersion>
    <VirtualHost *:$SSL>
        SSLEngine on
        SSLCertificateFile    $TOOLS/localhost.crt
        SSLCertificateKeyFile $TOOLS/localhost.key
    </VirtualHost>
</IfDefine>
