search: force large mbox result downloads to POST

This should prevent crawlers (including most robots.txt ignoring
ones) from burning our CPU time without severely compromising
usability for humans.

1 files changed, 12 insertions, 7 deletions

diff --git a/lib/PublicInbox/SearchView.pm b/lib/PublicInbox/SearchView.pm
index 8e0c3cfc..13e9c179 100644
--- a/lib/PublicInbox/SearchView.pm
+++ b/lib/PublicInbox/SearchView.pm
@@ -18,12 +18,19 @@ our $LIM = 200;
 
 sub noop {}
 
+sub mbox_results {
+        my ($ctx) = @_;
+        my $q = PublicInbox::SearchQuery->new($ctx->{qp});
+        my $x = $q->{x};
+        return PublicInbox::Mbox::mbox_all($ctx, $q->{'q'}) if $x eq 'm';
+        sres_top_html($ctx);
+}
+
 sub sres_top_html {
         my ($ctx) = @_;
         my $q = PublicInbox::SearchQuery->new($ctx->{qp});
         my $x = $q->{x};
         my $query = $q->{'q'};
-        return PublicInbox::Mbox::mbox_all($ctx, $query) if $x eq 'm';
 
         my $code = 200;
         # double the limit for expanded views:
@@ -60,7 +67,7 @@ retry:
         } else {
                 return adump($_[0], $mset, $q, $ctx) if $x eq 'A';
 
-                $ctx->{-html_tip} = search_nav_top($mset, $q, $ctx) . "\n\n";
+                $ctx->{-html_tip} = search_nav_top($mset, $q, $ctx);
                 if ($x eq 't') {
                         $cb = mset_thread($ctx, $mset, $q);
                 } else {
@@ -131,8 +138,8 @@ sub err_txt {
 
 sub search_nav_top {
         my ($mset, $q, $ctx) = @_;
-
-        my $rv = '<pre>';
+        my $m = $q->qs_html(x => 'm', r => undef);
+        my $rv = qq{<form\naction="?$m"\nmethod="post"><pre>};
         my $initial_q = $ctx->{-uxs_retried};
         if (defined $initial_q) {
                 my $rewritten = $q->{'q'};
@@ -166,10 +173,8 @@ sub search_nav_top {
         }
         my $A = $q->qs_html(x => 'A', r => undef);
         $rv .= qq{|<a\nhref="?$A">Atom feed</a>]};
-        my $m = $q->qs_html(x => 'm', r => undef);
-        warn "m: $m\n";
         $rv .= qq{\n\t\t\t\t\t\tdownload: };
-        $rv .= qq{<a\nhref="?$m"\nrel="nofollow">mbox.gz</a>};
+        $rv .= qq{<input\ntype=submit\nvalue="mbox.gz"/></pre></form><pre>};
 }
 
 sub search_nav_bot {