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<%INIT>

# Since data in the DB can change at any time, the default headers
# for dynamic content (content generated from most Mason templates) is:
#
# Cache-control: no-cache, no-store, must-revalidate, s-maxage=0
# Pragma: no-cache
# Expires: [a short time in the past to account for any time drift]

my $cache_control;

my $expires = RT::Date->new(RT->SystemUser);
$expires->SetToNow;

if ( $MaxAgeSeconds && !RT->Config->Get('WebStrictBrowserCache') ) {
    $expires->AddSeconds($MaxAgeSeconds);

    # Expires is an older header and has been superseded by Cache-control
    # and max-age, so set that also. New browsers will use max-age and
    # ignore Expires.

    # We're allowing a short cache, so replace no-cache with max-age.

    $cache_control = "max-age=$MaxAgeSeconds, private"
}
else {
    # Setting Expires to 0, a common approach to "immediately expired"
    # doesn't send an Expires header from Mason, so set a little in the past.

    $expires->AddSeconds(-30);
    $cache_control = 'no-cache, no-store, must-revalidate, s-maxage=0';
}

# Pragma is deprecated and usually ignored if Cache-control is sent.
# Should only be used by HTTP/1.0 clients.
if ( $cache_control =~ /no-cache/ ) {
    $r->headers_out->{'Pragma'} = 'no-cache';
}
else {
    delete $r->headers_out->{'Pragma'};
}

$r->headers_out->{'Expires'} = $expires->RFC2616;

$r->headers_out->{'Cache-control'} = $cache_control;

$m->callback( %ARGS, CallbackName => 'End' );
</%INIT>
<%ARGS>
$MaxAgeSeconds => undef  # Time in seconds to allow for cache
</%ARGS>
