replace invalid utf8 sequences by UTF-8 REPLACEMENT CHARACTER (efbfbd)
[gitweb.git] / gitweb.cgi
index 8d4e4f702204d7a555117ab82ff64130cd4231c4..f2a1526da6eae702ea38bba1482f9ac77992fdd1 100755 (executable)
@@ -5,24 +5,25 @@
 # (C) 2005, Kay Sievers <kay.sievers@vrfy.org>
 # (C) 2005, Christian Gierke <ch@gierke.de>
 #
-# This program is licensed under the GPL v2, or a later version
+# This program is licensed under the GPLv2
 
 use strict;
 use warnings;
 use CGI qw(:standard :escapeHTML -nosticky);
 use CGI::Util qw(unescape);
 use CGI::Carp qw(fatalsToBrowser);
+use Encode;
 use Fcntl ':mode';
 
 my $cgi = new CGI;
-my $version =          "240";
+my $version =          "249";
 my $my_url =           $cgi->url();
 my $my_uri =           $cgi->url(-absolute => 1);
-my $rss_link = "";
+my $rss_link =         "";
 
 # absolute fs-path which will be prepended to the project path
-my $projectroot =      "/pub/scm";
-$projectroot = "/home/kay/public_html/pub/scm";
+#my $projectroot =     "/pub/scm";
+my $projectroot =      "/home/kay/public_html/pub/scm";
 
 # location of the git-core binaries
 my $gitbin =           "/usr/bin";
@@ -37,13 +38,13 @@ my $home_link =             $my_uri;
 my $home_text =                "indextext.html";
 
 # source of projects list
-#my $projects_list = $projectroot;
-my $projects_list = "index/index.aux";
+#my $projects_list =   $projectroot;
+my $projects_list =    "index/index.aux";
 
 # input validation and dispatch
 my $action = $cgi->param('a');
 if (defined $action) {
-       if ($action =~ m/[^0-9a-zA-Z\.\-_]+/) {
+       if ($action =~ m/[^0-9a-zA-Z\.\-_]/) {
                undef $action;
                die_error(undef, "Invalid action parameter.");
        }
@@ -58,7 +59,7 @@ if (defined $action) {
 
 my $order = $cgi->param('o');
 if (defined $order) {
-       if ($order =~ m/[^a-zA-Z0-9_]/) {
+       if ($order =~ m/[^0-9a-zA-Z_]/) {
                undef $order;
                die_error(undef, "Invalid order parameter.");
        }
@@ -66,13 +67,9 @@ if (defined $order) {
 
 my $project = $cgi->param('p');
 if (defined $project) {
-       if ($project =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
-               undef $project;
-               die_error(undef, "Non-canonical project parameter.");
-       }
-       if ($project =~ m/[^a-zA-Z0-9_\.\/\-\+\#\~]/) {
-               undef $project;
-               die_error(undef, "Invalid character in project parameter.");
+       $project = validate_input($project);
+       if (!defined($project)) {
+               die_error(undef, "Invalid project parameter.");
        }
        if (!(-d "$projectroot/$project")) {
                undef $project;
@@ -82,7 +79,8 @@ if (defined $project) {
                undef $project;
                die_error(undef, "No such project.");
        }
-       $rss_link = "<link rel=\"alternate\" title=\"$project log\" href=\"$my_uri?p=$project;a=rss\" type=\"application/rss+xml\"/>";
+       $rss_link = "<link rel=\"alternate\" title=\"" . esc_url($project) . " log\" href=\"" .
+                   esc_url("$my_uri?p=$project;a=rss") . "\" type=\"application/rss+xml\"/>";
        $ENV{'GIT_DIR'} = "$projectroot/$project";
 } else {
        git_project_list();
@@ -91,54 +89,39 @@ if (defined $project) {
 
 my $file_name = $cgi->param('f');
 if (defined $file_name) {
-       if ($file_name =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
-               undef $file_name;
-               die_error(undef, "Non-canonical file parameter.");
-       }
-       if ($file_name =~ m/[^a-zA-Z0-9_\.\/\-\+\#\~\:\!]/) {
-               undef $file_name;
-               die_error(undef, "Invalid character in file parameter.");
+       $file_name = validate_input($file_name);
+       if (!defined($file_name)) {
+               die_error(undef, "Invalid file parameter.");
        }
 }
 
 my $hash = $cgi->param('h');
 if (defined $hash) {
-       if (!($hash =~ m/^[0-9a-fA-F]{40}$/)) {
-               if ($hash =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
-                       undef $hash;
-                       die_error(undef, "Non-canonical hash parameter.");
-               }
-               if ($hash =~ m/[^a-zA-Z0-9_\.\/\-\+\#\~\:\!]/) {
-                       undef $hash;
-                       die_error(undef, "Invalid character in hash parameter.");
-               }
-               # replace branch-name with hash
-               my $branchlist = git_read_refs("refs/heads");
-               foreach my $entry (@$branchlist) {
-                       my %branch = %$entry;
-                       if ($branch{'name'} eq $hash) {
-                               $hash = $branch{'id'};
-                               last;
-                       }
-               }
+       $hash = validate_input($hash);
+       if (!defined($hash)) {
+               die_error(undef, "Invalid hash parameter.");
        }
 }
 
 my $hash_parent = $cgi->param('hp');
-if (defined $hash_parent && !($hash_parent =~ m/^[0-9a-fA-F]{40}$/)) {
-       undef $hash_parent;
-       die_error(undef, "Invalid hash_parent parameter.");
+if (defined $hash_parent) {
+       $hash_parent = validate_input($hash_parent);
+       if (!defined($hash_parent)) {
+               die_error(undef, "Invalid hash parent parameter.");
+       }
 }
 
 my $hash_base = $cgi->param('hb');
-if (defined $hash_base && !($hash_base =~ m/^[0-9a-fA-F]{40}$/)) {
-       undef $hash_base;
-       die_error(undef, "Invalid parent hash parameter.");
+if (defined $hash_base) {
+       $hash_base = validate_input($hash_base);
+       if (!defined($hash_base)) {
+               die_error(undef, "Invalid hash base parameter.");
+       }
 }
 
 my $page = $cgi->param('pg');
 if (defined $page) {
-       if ($page =~ m/^[^0-9]+$/) {
+       if ($page =~ m/[^0-9]$/) {
                undef $page;
                die_error(undef, "Invalid page parameter.");
        }
@@ -153,11 +136,26 @@ if (defined $searchtext) {
        $searchtext = quotemeta $searchtext;
 }
 
+sub validate_input {
+       my $input = shift;
+
+       if ($input =~ m/^[0-9a-fA-F]{40}$/) {
+               return $input;
+       }
+       if ($input =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
+               return undef;
+       }
+       if ($input =~ m/[^a-zA-Z0-9_ \.\/\-\+\#\~]/) {
+               return undef;
+       }
+       return $input;
+}
+
 if (!defined $action || $action eq "summary") {
        git_summary();
        exit;
-} elsif ($action eq "branches") {
-       git_branches();
+} elsif ($action eq "heads") {
+       git_heads();
        exit;
 } elsif ($action eq "tags") {
        git_tags();
@@ -210,8 +208,23 @@ if (!defined $action || $action eq "summary") {
        exit;
 }
 
+sub esc_url {
+       my $str = shift;
+       $str =~ s/\+/%2B/g;
+       $str =~ s/ /\+/g;
+       return $str;
+}
+
+sub esc_html {
+       my $str = shift;
+       $str = escapeHTML($str);
+       $str = decode("utf8", $str, Encode::FB_DEFAULT);
+       return $str;
+}
+
 sub git_header_html {
        my $status = shift || "200 OK";
+       my $expires = shift;
 
        my $title = "git";
        if (defined $project) {
@@ -220,7 +233,7 @@ sub git_header_html {
                        $title .= "/$action";
                }
        }
-       print $cgi->header(-type=>'text/html',  -charset => 'utf-8', -status=> $status);
+       print $cgi->header(-type=>'text/html',  -charset => 'utf-8', -status=> $status, -expires => $expires);
        print <<EOF;
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
@@ -289,11 +302,11 @@ a.rss_logo:hover { background-color:#ee5500; }
 EOF
        print "<div class=\"page_header\">\n" .
              "<a href=\"http://www.kernel.org/pub/software/scm/git/docs/\" title=\"git documentation\">" .
-             "<img src=\"$my_uri?a=git-logo.png\" width=\"72\" height=\"27\" alt=\"git\" style=\"float:right; border-width:0px;\"/>" .
+             "<img src=\"" . esc_url("$my_uri?a=git-logo.png") . "\" width=\"72\" height=\"27\" alt=\"git\" style=\"float:right; border-width:0px;\"/>" .
              "</a>\n";
-       print $cgi->a({-href => $home_link}, "projects") . " / ";
+       print $cgi->a({-href => esc_url($home_link)}, "projects") . " / ";
        if (defined $project) {
-               print $cgi->a({-href => "$my_uri?p=$project;a=summary"}, escapeHTML($project));
+               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, esc_html($project));
                if (defined $action) {
                        print " / $action";
                }
@@ -301,11 +314,19 @@ EOF
                if (!defined $searchtext) {
                        $searchtext = "";
                }
+               my $search_hash;
+               if (defined $hash) {
+                       $search_hash = $hash;
+               } else {
+                       $search_hash  = "HEAD";
+               }
                $cgi->param("a", "search");
-               print $cgi->startform(-method => "get", -action => "$my_uri") .
+               $cgi->param("h", $search_hash);
+               print $cgi->startform(-method => "get", -action => $my_uri) .
                      "<div class=\"search\">\n" .
                      $cgi->hidden(-name => "p") . "\n" .
                      $cgi->hidden(-name => "a") . "\n" .
+                     $cgi->hidden(-name => "h") . "\n" .
                      $cgi->textfield(-name => "s", -value => $searchtext) . "\n" .
                      "</div>" .
                      $cgi->end_form() . "\n";
@@ -318,11 +339,11 @@ sub git_footer_html {
        if (defined $project) {
                my $descr = git_read_description($project);
                if (defined $descr) {
-                       print "<div class=\"page_footer_text\">" . escapeHTML($descr) . "</div>\n";
+                       print "<div class=\"page_footer_text\">" . esc_html($descr) . "</div>\n";
                }
-               print $cgi->a({-href => "$my_uri?p=$project;a=rss", -class => "rss_logo"}, "RSS") . "\n";
+               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=rss"), -class => "rss_logo"}, "RSS") . "\n";
        } else {
-               print $cgi->a({-href => "$my_uri?a=opml", -class => "rss_logo"}, "OPML") . "\n";
+               print $cgi->a({-href => esc_url("$my_uri?a=opml"), -class => "rss_logo"}, "OPML") . "\n";
        }
        print "</div>\n" .
              "</body>\n" .
@@ -447,21 +468,28 @@ sub git_read_commit {
 
        my @commit_lines;
        my %co;
-       my @parents;
 
        if (defined $commit_text) {
                @commit_lines = @$commit_text;
        } else {
-               open my $fd, "-|", "$gitbin/git-cat-file commit $commit_id" or return;
-               @commit_lines = map { chomp; $_ } <$fd>;
+               $/ = "\0";
+               open my $fd, "-|", "$gitbin/git-rev-list --header --parents --max-count=1 $commit_id" or return;
+               @commit_lines = split '\n', <$fd>;
                close $fd or return;
+               $/ = "\n";
+               pop @commit_lines;
+       }
+       my $header = shift @commit_lines;
+       if (!($header =~ m/^[0-9a-fA-F]{40}/)) {
+               return;
        }
+       ($co{'id'}, my @parents) = split ' ', $header;
+       $co{'parents'} = \@parents;
+       $co{'parent'} = $parents[0];
        while (my $line = shift @commit_lines) {
                last if $line eq "\n";
                if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
                        $co{'tree'} = $1;
-               } elsif ($line =~ m/^parent ([0-9a-fA-F]{40})$/) {
-                       push @parents, $1;
                } elsif ($line =~ m/^author (.*) ([0-9]+) (.*)$/) {
                        $co{'author'} = $1;
                        $co{'author_epoch'} = $2;
@@ -480,15 +508,12 @@ sub git_read_commit {
                }
        }
        if (!defined $co{'tree'}) {
-               return undef
+               return;
        };
-       $co{'id'} = $commit_id;
-       $co{'parents'} = \@parents;
-       $co{'parent'} = $parents[0];
-       $co{'comment'} = \@commit_lines;
+
        foreach my $title (@commit_lines) {
                if ($title ne "") {
-                       $co{'title'} = chop_str($title, 80);
+                       $co{'title'} = chop_str($title, 80, 5);
                        # remove leading stuff of merges to make the interesting part visible
                        if (length($title) > 50) {
                                $title =~ s/^Automatic //;
@@ -506,10 +531,15 @@ sub git_read_commit {
                                        $title =~ s/\/pub\/scm//;
                                }
                        }
-                       $co{'title_short'} = chop_str($title, 50);
+                       $co{'title_short'} = chop_str($title, 50, 5);
                        last;
                }
        }
+       # remove added spaces
+       foreach my $line (@commit_lines) {
+               $line =~ s/^    //;
+       }
+       $co{'comment'} = \@commit_lines;
 
        my $age = time - $co{'committer_epoch'};
        $co{'age'} = $age;
@@ -558,7 +588,7 @@ sub git_diff_print {
                close $fd;
        }
 
-       open my $fd, "-|", "/usr/bin/diff -u -p -L $from_name -L $to_name $from_tmp $to_tmp";
+       open my $fd, "-|", "/usr/bin/diff -u -p -L \'$from_name\' -L \'$to_name\' $from_tmp $to_tmp";
        if ($format eq "plain") {
                undef $/;
                print <$fd>;
@@ -584,7 +614,7 @@ sub git_diff_print {
                                        $line =~ s/\t/$spaces/;
                                }
                        }
-                       print "<div class=\"pre\"$color>" . escapeHTML($line) . "</div>\n";
+                       print "<div class=\"pre\"$color>" . esc_html($line) . "</div>\n";
                }
        }
        close $fd;
@@ -621,12 +651,15 @@ sub chop_str {
        my $len = shift;
        my $add_len = shift || 10;
 
-       $str =~ m/^(.{0,$len}[^ \/\-_:\.@]{0,$add_len})/;
-       my $chopped = $1;
-       if ($chopped ne $str) {
-               $chopped .= " ...";
+       # allow only $len chars, but don't cut a word if it would fit in $add_len
+       # if it doesn't fit, cut it if it's still longer than the dots we would add
+       $str =~ m/^(.{0,$len}[^ \/\-_:\.@]{0,$add_len})(.*)/;
+       my $body = $1;
+       my $tail = $2;
+       if (length($tail) > 4) {
+               $tail = " ...";
        }
-       return $chopped;
+       return "$body$tail";
 }
 
 sub file_type {
@@ -646,12 +679,12 @@ sub file_type {
 sub format_log_line_html {
        my $line = shift;
 
-       $line = escapeHTML($line);
+       $line = esc_html($line);
        $line =~ s/ /&nbsp;/g;
        if ($line =~ m/([0-9a-fA-F]{40})/) {
                my $hash_text = $1;
                if (git_get_type($hash_text) eq "commit") {
-                       my $link = $cgi->a({-class => "text", -href => "$my_uri?p=$project;a=commit;h=$hash_text"}, $hash_text);
+                       my $link = $cgi->a({-class => "text", -href => esc_url("$my_uri?p=$project;a=commit;h=$hash_text")}, $hash_text);
                        $line =~ s/$hash_text/$link/;
                }
        }
@@ -799,25 +832,25 @@ sub git_project_list {
                @projects = sort {$a->{'path'} cmp $b->{'path'}} @projects;
                print "<th>Project</th>\n";
        } else {
-               print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?o=project"}, "Project") . "</th>\n";
+               print "<th>" . $cgi->a({-class => "header", -href => esc_url("$my_uri?o=project")}, "Project") . "</th>\n";
        }
        if (defined($order) && ($order eq "descr")) {
                @projects = sort {$a->{'descr'} cmp $b->{'descr'}} @projects;
                print "<th>Description</th>\n";
        } else {
-               print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?o=descr"}, "Description") . "</th>\n";
+               print "<th>" . $cgi->a({-class => "header", -href => esc_url("$my_uri?o=descr")}, "Description") . "</th>\n";
        }
        if (defined($order) && ($order eq "owner")) {
                @projects = sort {$a->{'owner'} cmp $b->{'owner'}} @projects;
                print "<th>Owner</th>\n";
        } else {
-               print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?o=owner"}, "Owner") . "</th>\n";
+               print "<th>" . $cgi->a({-class => "header", -href => esc_url("$my_uri?o=owner")}, "Owner") . "</th>\n";
        }
        if (defined($order) && ($order eq "age")) {
                @projects = sort {$a->{'commit'}{'age'} <=> $b->{'commit'}{'age'}} @projects;
                print "<th>Last Change</th>\n";
        } else {
-               print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?o=age"}, "Last Change") . "</th>\n";
+               print "<th>" . $cgi->a({-class => "header", -href => esc_url("$my_uri?o=age")}, "Last Change") . "</th>\n";
        }
        print "<th></th>\n" .
              "</tr>\n";
@@ -829,7 +862,7 @@ sub git_project_list {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
-               print "<td>" . $cgi->a({-href => "$my_uri?p=$pr->{'path'};a=summary", -class => "list"}, escapeHTML($pr->{'path'})) . "</td>\n" .
+               print "<td>" . $cgi->a({-href => esc_url("$my_uri?p=$pr->{'path'};a=summary"), -class => "list"}, esc_html($pr->{'path'})) . "</td>\n" .
                      "<td>$pr->{'descr'}</td>\n" .
                      "<td><i>" . chop_str($pr->{'owner'}, 15) . "</i></td>\n";
                my $colored_age;
@@ -842,9 +875,9 @@ sub git_project_list {
                }
                print "<td>$colored_age</td>\n" .
                      "<td class=\"link\">" .
-                     $cgi->a({-href => "$my_uri?p=$pr->{'path'};a=summary"}, "summary") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$pr->{'path'};a=shortlog"}, "shortlog") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$pr->{'path'};a=log"}, "log") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$pr->{'path'};a=summary")}, "summary") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$pr->{'path'};a=shortlog")}, "shortlog") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$pr->{'path'};a=log")}, "log") .
                      "</td>\n" .
                      "</tr>\n";
        }
@@ -943,16 +976,16 @@ sub git_summary {
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              "summary".
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree"}, "tree") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$head")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$head")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree")}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
        print "<div class=\"title\">&nbsp;</div>\n";
        print "<table cellspacing=\"0\">\n" .
-             "<tr><td>description</td><td>" . escapeHTML($descr) . "</td></tr>\n" .
+             "<tr><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
              "<tr><td>owner</td><td>$owner</td></tr>\n" .
              "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n" .
              "</table>\n";
@@ -960,7 +993,7 @@ sub git_summary {
        my (@revlist) = map { chomp; $_ } <$fd>;
        close $fd;
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=shortlog", -class => "title"}, "shortlog") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog"), -class => "title"}, "shortlog") .
              "</div>\n";
        my $i = 16;
        print "<table cellspacing=\"0\">\n";
@@ -976,18 +1009,23 @@ sub git_summary {
                $alternate ^= 1;
                if ($i-- > 0) {
                        print "<td><i>$co{'age_string'}</i></td>\n" .
-                             "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
-                             "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"},
-                             "<b>" . escapeHTML($co{'title_short'}) . "</b>") .
-                             "</td>\n" .
+                             "<td><i>" . esc_html(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
+                             "<td>";
+                       if (length($co{'title_short'}) < length($co{'title'})) {
+                               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit"), -class => "list", -title => "$co{'title'}"},
+                                     "<b>" . esc_html($co{'title_short'}) . "</b>");
+                       } else {
+                               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit"), -class => "list"},
+                                     "<b>" . esc_html($co{'title'}) . "</b>");
+                       }
+                       print "</td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
-                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$commit"}, "commitdiff") .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit")}, "commit") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
                              "</td>\n" .
                              "</tr>";
                } else {
-                       print "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "...") . "</td>\n" .
+                       print "<td>" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "...") . "</td>\n" .
                        "</tr>";
                        last;
                }
@@ -997,7 +1035,7 @@ sub git_summary {
        my $taglist = git_read_refs("refs/tags");
        if (defined @$taglist) {
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=tags", -class => "title"}, "tags") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=tags"), -class => "title"}, "tags") .
                      "</div>\n";
                my $i = 16;
                print "<table cellspacing=\"0\">\n";
@@ -1018,27 +1056,27 @@ sub git_summary {
                        if ($i-- > 0) {
                                print "<td><i>$tag{'age'}</i></td>\n" .
                                      "<td>" .
-                                     $cgi->a({-href => "$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}", -class => "list"},
-                                     "<b>" . escapeHTML($tag{'name'}) . "</b>") .
+                                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}"), -class => "list"},
+                                     "<b>" . esc_html($tag{'name'}) . "</b>") .
                                      "</td>\n" .
                                      "<td>";
                                if (defined($comment)) {
-                                     print $cgi->a({-class => "list", -href => "$my_uri?p=$project;a=tag;h=$tag{'id'}"}, $comment);
+                                     print $cgi->a({-class => "list", -href => esc_url("$my_uri?p=$project;a=tag;h=$tag{'id'}")}, $comment);
                                }
                                print "</td>\n" .
                                      "<td class=\"link\">";
                                if ($tag{'type'} eq "tag") {
-                                     print $cgi->a({-href => "$my_uri?p=$project;a=tag;h=$tag{'id'}"}, "tag") . " | ";
+                                     print $cgi->a({-href => esc_url("$my_uri?p=$project;a=tag;h=$tag{'id'}")}, "tag") . " | ";
                                }
-                               print $cgi->a({-href => "$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}"}, $tag{'reftype'});
+                               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}")}, $tag{'reftype'});
                                if ($tag{'reftype'} eq "commit") {
-                                     print " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
-                                           " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'refid'}"}, "log");
+                                     print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
+                                           " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$tag{'refid'}")}, "log");
                                }
                                print "</td>\n" .
                                      "</tr>";
                        } else {
-                               print "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=tags"}, "...") . "</td>\n" .
+                               print "<td>" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tags")}, "...") . "</td>\n" .
                                "</tr>";
                                last;
                        }
@@ -1046,15 +1084,15 @@ sub git_summary {
                print "</table\n>";
        }
 
-       my $branchlist = git_read_refs("refs/heads");
-       if (defined @$branchlist) {
+       my $headlist = git_read_refs("refs/heads");
+       if (defined @$headlist) {
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=branches", -class => "title"}, "branches") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=heads"), -class => "title"}, "heads") .
                      "</div>\n";
                my $i = 16;
                print "<table cellspacing=\"0\">\n";
                my $alternate = 0;
-               foreach my $entry (@$branchlist) {
+               foreach my $entry (@$headlist) {
                        my %tag = %$entry;
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
@@ -1065,16 +1103,16 @@ sub git_summary {
                        if ($i-- > 0) {
                                print "<td><i>$tag{'age'}</i></td>\n" .
                                      "<td>" .
-                                     $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}", -class => "list"},
-                                     "<b>" . escapeHTML($tag{'name'}) . "</b>") .
+                                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$tag{'name'}"), -class => "list"},
+                                     "<b>" . esc_html($tag{'name'}) . "</b>") .
                                      "</td>\n" .
                                      "<td class=\"link\">" .
-                                     $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
-                                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'name'}"}, "log") .
+                                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
+                                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$tag{'name'}")}, "log") .
                                      "</td>\n" .
                                      "</tr>";
                        } else {
-                               print "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=branches"}, "...") . "</td>\n" .
+                               print "<td>" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=heads")}, "...") . "</td>\n" .
                                "</tr>";
                                last;
                        }
@@ -1088,28 +1126,28 @@ sub git_tag {
        my $head = git_read_hash("$project/HEAD");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;hb=$head"}, "tree") . "<br/>\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$head")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$head")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;hb=$head")}, "tree") . "<br/>\n" .
              "<br/>\n" .
              "</div>\n";
        my %tag = git_read_tag($hash);
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($tag{'name'})) . "\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($tag{'name'})) . "\n" .
              "</div>\n";
        print "<div class=\"title_text\">\n" .
              "<table cellspacing=\"0\">\n" .
              "<tr>\n" .
              "<td>object</td>\n" .
-             "<td>" . $cgi->a({-class => "list", -href => "$my_uri?p=$project;a=$tag{'type'};h=$tag{'object'}"}, $tag{'object'}) . "</td>\n" .
-             "<td class=\"link\">" . $cgi->a({-href => "$my_uri?p=$project;a=$tag{'type'};h=$tag{'object'}"}, $tag{'type'}) . "</td>\n" .
+             "<td>" . $cgi->a({-class => "list", -href => esc_url("$my_uri?p=$project;a=$tag{'type'};h=$tag{'object'}")}, $tag{'object'}) . "</td>\n" .
+             "<td class=\"link\">" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=$tag{'type'};h=$tag{'object'}")}, $tag{'type'}) . "</td>\n" .
              "</tr>\n";
        if (defined($tag{'author'})) {
                my %ad = date_str($tag{'epoch'}, $tag{'tz'});
-               print "<tr><td>author</td><td>" . escapeHTML($tag{'author'}) . "</td></tr>\n";
+               print "<tr><td>author</td><td>" . esc_html($tag{'author'}) . "</td></tr>\n";
                print "<tr><td></td><td>" . $ad{'rfc2822'} . sprintf(" (%02d:%02d %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'}) . "</td></tr>\n";
        }
        print "</table>\n\n" .
@@ -1117,7 +1155,7 @@ sub git_tag {
        print "<div class=\"page_body\">";
        my $comment = $tag{'comment'};
        foreach my $line (@$comment) {
-               print escapeHTML($line) . "<br/>\n";
+               print esc_html($line) . "<br/>\n";
        }
        print "</div>\n";
        git_footer_html();
@@ -1127,17 +1165,17 @@ sub git_tags {
        my $head = git_read_hash("$project/HEAD");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;hb=$head"}, "tree") . "<br/>\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$head")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$head")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;hb=$head")}, "tree") . "<br/>\n" .
              "<br/>\n" .
              "</div>\n";
        my $taglist = git_read_refs("refs/tags");
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary"), -class => "title"}, "&nbsp;") .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
@@ -1157,22 +1195,22 @@ sub git_tags {
                        $alternate ^= 1;
                        print "<td><i>$tag{'age'}</i></td>\n" .
                              "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}", -class => "list"},
-                             "<b>" . escapeHTML($tag{'name'}) . "</b>") .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}"), -class => "list"},
+                             "<b>" . esc_html($tag{'name'}) . "</b>") .
                              "</td>\n" .
                              "<td>";
                        if (defined($comment)) {
-                             print $cgi->a({-class => "list", -href => "$my_uri?p=$project;a=tag;h=$tag{'id'}"}, $comment);
+                             print $cgi->a({-class => "list", -href => esc_url("$my_uri?p=$project;a=tag;h=$tag{'id'}")}, $comment);
                        }
                        print "</td>\n" .
                              "<td class=\"link\">";
                        if ($tag{'type'} eq "tag") {
-                             print $cgi->a({-href => "$my_uri?p=$project;a=tag;h=$tag{'id'}"}, "tag") . " | ";
+                             print $cgi->a({-href => esc_url("$my_uri?p=$project;a=tag;h=$tag{'id'}")}, "tag") . " | ";
                        }
-                       print $cgi->a({-href => "$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}"}, $tag{'reftype'});
+                       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=$tag{'reftype'};h=$tag{'refid'}")}, $tag{'reftype'});
                        if ($tag{'reftype'} eq "commit") {
-                             print " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
-                                   " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'refid'}"}, "log");
+                             print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
+                                   " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$tag{'refid'}")}, "log");
                        }
                        print "</td>\n" .
                              "</tr>";
@@ -1182,21 +1220,21 @@ sub git_tags {
        git_footer_html();
 }
 
-sub git_branches {
+sub git_heads {
        my $head = git_read_hash("$project/HEAD");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;hb=$head"}, "tree") . "<br/>\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$head")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$head")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;hb=$head")}, "tree") . "<br/>\n" .
              "<br/>\n" .
              "</div>\n";
        my $taglist = git_read_refs("refs/heads");
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary"), -class => "title"}, "&nbsp;") .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
@@ -1211,11 +1249,11 @@ sub git_branches {
                        $alternate ^= 1;
                        print "<td><i>$tag{'age'}</i></td>\n" .
                              "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}", -class => "list"}, "<b>" . escapeHTML($tag{'name'}) . "</b>") .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$tag{'name'}"), -class => "list"}, "<b>" . esc_html($tag{'name'}) . "</b>") .
                              "</td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
-                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'name'}"}, "log") .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$tag{'name'}")}, "log") .
                              "</td>\n" .
                              "</tr>";
                }
@@ -1260,20 +1298,23 @@ sub git_blob {
                $hash = git_get_hash_by_path($base, $file_name, "blob");
        }
        open my $fd, "-|", "$gitbin/git-cat-file blob $hash" or die_error(undef, "Open failed.");
-       my $base = $file_name || "";
        git_header_html();
        if (defined $hash_base && (my %co = git_read_commit($hash_base))) {
                print "<div class=\"page_nav\">\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base"}, "commit") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash_base"}, "commitdiff") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash_base"}, "tree") . "<br/>\n";
-               print $cgi->a({-href => "$my_uri?p=$project;a=blob_plain;h=$hash"}, "plain") . "<br/>\n" .
-                     "</div>\n";
-               print "<div>" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base", -class => "title"}, escapeHTML($co{'title'})) .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash_base")}, "commit") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash_base")}, "tree") . "<br/>\n";
+               if (defined $file_name) {
+                       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob_plain;h=$hash;f=$file_name")}, "plain") . "<br/>\n";
+               } else {
+                       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob_plain;h=$hash")}, "plain") . "<br/>\n";
+               }
+               print "</div>\n".
+                      "<div>" .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'})) .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n" .
@@ -1294,7 +1335,7 @@ sub git_blob {
                                $line =~ s/\t/$spaces/;
                        }
                }
-               printf "<div class=\"pre\"><a id=\"l%i\" href=\"#l%i\" class=\"linenr\">%4i</a> %s</div>\n", $nr, $nr, $nr, escapeHTML($line);
+               printf "<div class=\"pre\"><a id=\"l%i\" href=\"#l%i\" class=\"linenr\">%4i</a> %s</div>\n", $nr, $nr, $nr, esc_html($line);
        }
        close $fd or print "Reading blob failed.\n";
        print "</div>";
@@ -1302,7 +1343,11 @@ sub git_blob {
 }
 
 sub git_blob_plain {
-       print $cgi->header(-type => "text/plain", -charset => 'utf-8');
+       my $save_as = "$hash.txt";
+       if (defined $file_name) {
+               $save_as = $file_name;
+       }
+       print $cgi->header(-type => "text/plain", -charset => 'utf-8', '-content-disposition' => "inline; filename=\"$save_as\"");
        open my $fd, "-|", "$gitbin/git-cat-file blob $hash" or return;
        undef $/;
        print <$fd>;
@@ -1332,16 +1377,16 @@ sub git_tree {
        if (defined $hash_base && (my %co = git_read_commit($hash_base))) {
                $base_key = ";hb=$hash_base";
                print "<div class=\"page_nav\">\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash_base"}, "shortlog") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash_base"}, "log") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base"}, "commit") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash_base"}, "commitdiff") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash_base")}, "shortlog") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash_base")}, "log") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash_base")}, "commit") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
                      " | tree" .
                      "<br/><br/>\n" .
                      "</div>\n";
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n";
@@ -1374,18 +1419,18 @@ sub git_tree {
                print "<td style=\"font-family:monospace\">" . mode_str($t_mode) . "</td>\n";
                if ($t_type eq "blob") {
                        print "<td class=\"list\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$t_hash" . $base_key . $file_key, -class => "list"}, $t_name) .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$t_hash" . $base_key . $file_key), -class => "list"}, $t_name) .
                              "</td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$t_hash" . $base_key . $file_key}, "blob") .
-                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=history;h=$hash_base" . $file_key}, "history") .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$t_hash" . $base_key . $file_key)}, "blob") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=history;h=$hash_base" . $file_key)}, "history") .
                              "</td>\n";
                } elsif ($t_type eq "tree") {
                        print "<td class=\"list\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$t_hash" . $base_key . $file_key}, $t_name) .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$t_hash" . $base_key . $file_key)}, $t_name) .
                              "</td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$t_hash" . $base_key . $file_key}, "tree") .
+                             $cgi->a({-href => esc("$my_uri?p=$project;a=tree;h=$t_hash" . $base_key . $file_key)}, "tree") .
                              "</td>\n";
                }
                print "</tr>\n";
@@ -1405,7 +1450,7 @@ sub git_rss {
              "<rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">\n";
        print "<channel>\n";
        print "<title>$project</title>\n".
-             "<link>" . escapeHTML("$my_url?p=$project;a=summary") . "</link>\n".
+             "<link>" . esc_html("$my_url?p=$project;a=summary") . "</link>\n".
              "<description>$project log</description>\n".
              "<language>en</language>\n";
 
@@ -1422,15 +1467,18 @@ sub git_rss {
                close $fd or next;
                print "<item>\n" .
                      "<title>" .
-                     sprintf("%d %s %02d:%02d", $cd{'mday'}, $cd{'month'}, $cd{'hour'}, $cd{'minute'}) . " - " . escapeHTML($co{'title'}) .
+                     sprintf("%d %s %02d:%02d", $cd{'mday'}, $cd{'month'}, $cd{'hour'}, $cd{'minute'}) . " - " . esc_html($co{'title'}) .
                      "</title>\n" .
+                     "<author>" . esc_html($co{'author'}) . "</author>\n" .
                      "<pubDate>$cd{'rfc2822'}</pubDate>\n" .
-                     "<link>" . escapeHTML("$my_url?p=$project;a=commit;h=$commit") . "</link>\n" .
-                     "<description>" . escapeHTML($co{'title'}) . "</description>\n" .
+                     "<guid isPermaLink=\"true\">" . esc_html("$my_url?p=$project;a=commit;h=$commit") . "</guid>\n" .
+                     "<link>" . esc_html("$my_url?p=$project;a=commit;h=$commit") . "</link>\n" .
+                     "<description>" . esc_html($co{'title'}) . "</description>\n" .
                      "<content:encoded>" .
                      "<![CDATA[\n";
                my $comment = $co{'comment'};
                foreach my $line (@$comment) {
+                       $line = decode("utf8", $line, Encode::FB_DEFAULT);
                        print "$line<br/>\n";
                }
                print "<br/>\n";
@@ -1472,7 +1520,7 @@ sub git_opml {
                        next;
                }
 
-               my $path = escapeHTML(chop_str($proj{'path'}, 25, 5));
+               my $path = esc_html(chop_str($proj{'path'}, 25, 5));
                my $rss =  "$my_url?p=$proj{'path'};a=rss";
                my $html =  "$my_url?p=$proj{'path'};a=summary";
                print "<outline type=\"rss\" text=\"$path\" title=\"$path\" xmlUrl=\"$rss\" htmlUrl=\"$html\"/>\n";
@@ -1492,12 +1540,12 @@ sub git_log {
        }
        git_header_html();
        print "<div class=\"page_nav\">\n";
-       print $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash"}, "shortlog") .
+       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash")}, "shortlog") .
              " | log" .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$hash;hb=$hash"}, "tree") . "<br/>\n";
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$hash;hb=$hash")}, "tree") . "<br/>\n";
 
        my $limit = sprintf("--max-count=%i", (100 * ($page+1)));
        open my $fd, "-|", "$gitbin/git-rev-list $limit $hash" or die_error(undef, "Open failed.");
@@ -1505,19 +1553,19 @@ sub git_log {
        close $fd;
 
        if ($hash ne $head || $page) {
-               print $cgi->a({-href => "$my_uri?p=$project;a=log"}, "HEAD");
+               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "HEAD");
        } else {
                print "HEAD";
        }
        if ($page > 0) {
                print " &sdot; " .
-               $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash;pg=" . ($page-1), -accesskey => "p", -title => "Alt-p"}, "prev");
+               $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash;pg=" . ($page-1)), -accesskey => "p", -title => "Alt-p"}, "prev");
        } else {
                print " &sdot; prev";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                print " &sdot; " .
-               $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash;pg=" . ($page+1), -accesskey => "n", -title => "Alt-n"}, "next");
+               $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash;pg=" . ($page+1)), -accesskey => "n", -title => "Alt-n"}, "next");
        } else {
                print " &sdot; next";
        }
@@ -1525,7 +1573,7 @@ sub git_log {
              "</div>\n";
        if (!@revlist) {
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary"), -class => "title"}, "&nbsp;") .
                      "</div>\n";
                my %co = git_read_commit($hash);
                print "<div class=\"page_body\"> Last change $co{'age_string'}.<br/><br/></div>\n";
@@ -1536,16 +1584,16 @@ sub git_log {
                next if !%co;
                my %ad = date_str($co{'author_epoch'});
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "title"},
-                     "<span class=\"age\">$co{'age_string'}</span>" . escapeHTML($co{'title'})) . "\n" .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit"), -class => "title"},
+                     "<span class=\"age\">$co{'age_string'}</span>" . esc_html($co{'title'})) . "\n" .
                      "</div>\n";
                print "<div class=\"title_text\">\n" .
                      "<div class=\"log_link\">\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$commit"}, "commitdiff") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit")}, "commit") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
                      "<br/>\n" .
                      "</div>\n" .
-                     "<i>" . escapeHTML($co{'author_name'}) .  " [$ad{'rfc2822'}]</i><br/>\n" .
+                     "<i>" . esc_html($co{'author_name'}) .  " [$ad{'rfc2822'}]</i><br/>\n" .
                      "</div>\n" .
                      "<div class=\"log_body\">\n";
                my $comment = $co{'comment'};
@@ -1590,29 +1638,35 @@ sub git_commit {
        open my $fd, "-|", "$gitbin/git-diff-tree -r -M $root $parent $hash" or die_error(undef, "Open failed.");
        @difftree = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading diff-tree failed.");
-       git_header_html();
+
+       # non-textual hash id's can be cached
+       my $expires;
+       if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
+               $expires = "+1d";
+       }
+       git_header_html(undef, $expires);
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash")}, "log") .
              " | commit";
        if (defined $co{'parent'}) {
-               print " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff");
+               print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash")}, "commitdiff");
        }
-       print " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") . "\n" .
+       print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") . "\n" .
              "<br/><br/></div>\n";
        if (defined $co{'parent'}) {
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
                      "</div>\n";
        }
        print "<div class=\"title_text\">\n" .
              "<table cellspacing=\"0\">\n";
-       print "<tr><td>author</td><td>" . escapeHTML($co{'author'}) . "</td></tr>\n".
+       print "<tr><td>author</td><td>" . esc_html($co{'author'}) . "</td></tr>\n".
              "<tr>" .
              "<td></td><td> $ad{'rfc2822'}";
        if ($ad{'hour_local'} < 6) {
@@ -1622,25 +1676,25 @@ sub git_commit {
        }
        print "</td>" .
              "</tr>\n";
-       print "<tr><td>committer</td><td>" . escapeHTML($co{'committer'}) . "</td></tr>\n";
+       print "<tr><td>committer</td><td>" . esc_html($co{'committer'}) . "</td></tr>\n";
        print "<tr><td></td><td> $cd{'rfc2822'}" . sprintf(" (%02d:%02d %s)", $cd{'hour_local'}, $cd{'minute_local'}, $cd{'tz_local'}) . "</td></tr>\n";
-       print "<tr><td>commit</td><td style=\"font-family:monospace\">$hash</td></tr>\n";
+       print "<tr><td>commit</td><td style=\"font-family:monospace\">$co{'id'}</td></tr>\n";
        print "<tr>" .
              "<td>tree</td>" .
              "<td style=\"font-family:monospace\">" .
-             $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash", class => "list"}, $co{'tree'}) .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"), class => "list"}, $co{'tree'}) .
              "</td>" .
-             "<td class=\"link\">" . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") .
+             "<td class=\"link\">" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") .
              "</td>" .
              "</tr>\n";
        my $parents  = $co{'parents'};
        foreach my $par (@$parents) {
                print "<tr>" .
                      "<td>parent</td>" .
-                     "<td style=\"font-family:monospace\">" . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$par", class => "list"}, $par) . "</td>" .
+                     "<td style=\"font-family:monospace\">" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$par"), class => "list"}, $par) . "</td>" .
                      "<td class=\"link\">" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$par"}, "commit") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash;hp=$par"}, "commitdiff") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$par")}, "commit") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash;hp=$par")}, "commitdiff") .
                      "</td>" .
                      "</tr>\n";
        }
@@ -1662,7 +1716,7 @@ sub git_commit {
                }
                if ($line =~ m/^ *(signed[ \-]off[ \-]by[ :]|acked[ \-]by[ :]|cc[ :])/i) {
                        $signed = 1;
-                       print "<span style=\"color: #888888\">" . escapeHTML($line) . "</span><br/>\n";
+                       print "<span style=\"color: #888888\">" . esc_html($line) . "</span><br/>\n";
                } else {
                        $signed = 0;
                        print format_log_line_html($line) . "<br/>\n";
@@ -1701,16 +1755,16 @@ sub git_commit {
                                $mode_chng = sprintf(" with mode: %04o", (oct $to_mode) & 0777);
                        }
                        print "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hp=$hash;f=$file", -class => "list"}, escapeHTML($file)) . "</td>\n" .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file)) . "</td>\n" .
                              "<td><span style=\"color: #008000;\">[new " . file_type($to_mode) . "$mode_chng]</span></td>\n" .
-                             "<td class=\"link\">" . $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, "blob") . "</td>\n";
+                             "<td class=\"link\">" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file")}, "blob") . "</td>\n";
                } elsif ($status eq "D") {
                        print "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file", -class => "list"}, escapeHTML($file)) . "</td>\n" .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file)) . "</td>\n" .
                              "<td><span style=\"color: #c00000;\">[deleted " . file_type($from_mode). "]</span></td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"}, "blob") .
-                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=history;h=$hash;f=$file"}, "history") .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file")}, "blob") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=history;h=$hash;f=$file")}, "history") .
                              "</td>\n"
                } elsif ($status eq "M" || $status eq "T") {
                        my $mode_chnge = "";
@@ -1730,18 +1784,18 @@ sub git_commit {
                        }
                        print "<td>";
                        if ($to_id ne $from_id) {
-                               print $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file", -class => "list"}, escapeHTML($file));
+                               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file));
                        } else {
-                               print $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file", -class => "list"}, escapeHTML($file));
+                               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file));
                        }
                        print "</td>\n" .
                              "<td>$mode_chnge</td>\n" .
                              "<td class=\"link\">";
-                       print $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, "blob");
+                       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file")}, "blob");
                        if ($to_id ne $from_id) {
-                               print " | " . $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file"}, "diff");
+                               print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file")}, "diff");
                        }
-                       print " | " . $cgi->a({-href => "$my_uri?p=$project;a=history;h=$hash;f=$file"}, "history") . "\n";
+                       print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=history;h=$hash;f=$file")}, "history") . "\n";
                        print "</td>\n";
                } elsif ($status eq "R") {
                        my ($from_file, $to_file) = split "\t", $file;
@@ -1750,14 +1804,14 @@ sub git_commit {
                                $mode_chng = sprintf(", mode: %04o", (oct $to_mode) & 0777);
                        }
                        print "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file", -class => "list"}, escapeHTML($to_file)) . "</td>\n" .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file"), -class => "list"}, esc_html($to_file)) . "</td>\n" .
                              "<td><span style=\"color: #777777;\">[moved from " .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$from_file", -class => "list"}, escapeHTML($from_file)) .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$from_file"), -class => "list"}, esc_html($from_file)) .
                              " with " . (int $similarity) . "% similarity$mode_chng]</span></td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file"}, "blob");
+                             $cgi->a({-href => esc_uresc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file")}, "blob");
                        if ($to_id ne $from_id) {
-                               print " | " . $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$to_file"}, "diff");
+                               print " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$to_file")}, "diff");
                        }
                        print "</td>\n";
                }
@@ -1772,17 +1826,17 @@ sub git_blobdiff {
        git_header_html();
        if (defined $hash_base && (my %co = git_read_commit($hash_base))) {
                print "<div class=\"page_nav\">\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base"}, "commit") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash_base"}, "commitdiff") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash_base"}, "tree") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash_base")}, "commit") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash_base")}, "tree") .
                      "<br/>\n";
-               print $cgi->a({-href => "$my_uri?p=$project;a=blobdiff_plain;h=$hash;hp=$hash_parent"}, "plain") .
+               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blobdiff_plain;h=$hash;hp=$hash_parent")}, "plain") .
                      "</div>\n";
                print "<div>\n" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n" .
@@ -1794,9 +1848,9 @@ sub git_blobdiff {
        }
        print "<div class=\"page_body\">\n" .
              "<div class=\"diff_info\">blob:" .
-             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$hash_parent;hb=$hash_base;f=$file_name"}, $hash_parent) .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$hash_parent;hb=$hash_base;f=$file_name")}, $hash_parent) .
              " -> blob:" .
-             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$hash;hb=$hash_base;f=$file_name"}, $hash) .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$hash;hb=$hash_base;f=$file_name")}, $hash) .
              "</div>\n";
        git_diff_print($hash_parent, $file_name || $hash_parent, $hash, $file_name || $hash);
        print "</div>";
@@ -1822,18 +1876,23 @@ sub git_commitdiff {
        my (@difftree) = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading diff-tree failed.");
 
-       git_header_html();
+       # non-textual hash id's can be cached
+       my $expires;
+       if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
+               $expires = "+1d";
+       }
+       git_header_html(undef, $expires);
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash")}, "commit") .
              " | commitdiff" .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") . "<br/>\n";
-       print $cgi->a({-href => "$my_uri?p=$project;a=commitdiff_plain;h=$hash;hp=$hash_parent"}, "plain") . "\n" .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") . "<br/>\n";
+       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff_plain;h=$hash;hp=$hash_parent")}, "plain") . "\n" .
              "</div>\n";
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
              "</div>\n";
        print "<div class=\"page_body\">\n";
        my $comment = $co{'comment'};
@@ -1872,20 +1931,20 @@ sub git_commitdiff {
                my $file = $6;
                if ($status eq "A") {
                        print "<div class=\"diff_info\">" .  file_type($to_mode) . ":" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, $to_id) . "(new)" .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file")}, $to_id) . "(new)" .
                              "</div>\n";
                        git_diff_print(undef, "/dev/null", $to_id, "b/$file");
                } elsif ($status eq "D") {
                        print "<div class=\"diff_info\">" . file_type($from_mode) . ":" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"}, $from_id) . "(deleted)" .
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file")}, $from_id) . "(deleted)" .
                              "</div>\n";
                        git_diff_print($from_id, "a/$file", undef, "/dev/null");
                } elsif ($status eq "M") {
                        if ($from_id ne $to_id) {
                                print "<div class=\"diff_info\">" .
-                                     file_type($from_mode) . ":" . $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"}, $from_id) .
+                                     file_type($from_mode) . ":" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file")}, $from_id) .
                                      " -> " .
-                                     file_type($to_mode) . ":" . $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, $to_id);
+                                     file_type($to_mode) . ":" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file")}, $to_id);
                                print "</div>\n";
                                git_diff_print($from_id, "a/$file",  $to_id, "b/$file");
                        }
@@ -1922,7 +1981,7 @@ sub git_commitdiff_plain {
        }
        close $fd;
 
-       print $cgi->header(-type => "text/plain", -charset => 'utf-8');
+       print $cgi->header(-type => "text/plain", -charset => 'utf-8', '-content-disposition' => "inline; filename=\"git-$hash.patch\"");
        my %co = git_read_commit($hash);
        my %ad = date_str($co{'author_epoch'}, $co{'author_tz'});
        my $comment = $co{'comment'};
@@ -1966,20 +2025,20 @@ sub git_history {
        }
        git_header_html();
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
              "</div>\n";
        print "<div class=\"page_path\"><b>/$file_name</b><br/></div>\n";
 
-       open my $fd, "-|", "$gitbin/git-rev-list $hash | $gitbin/git-diff-tree -r --stdin $file_name";
+       open my $fd, "-|", "$gitbin/git-rev-list $hash | $gitbin/git-diff-tree -r --stdin \'$file_name\'";
        my $commit;
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
@@ -2000,17 +2059,18 @@ sub git_history {
                        }
                        $alternate ^= 1;
                        print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                             "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 15, 3)) . "</i></td>\n" .
-                             "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"}, "<b>" .
-                             escapeHTML(chop_str($co{'title'}, 50)) . "</b>") . "</td>\n" .
+                             "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 3)) . "</i></td>\n" .
+                             "<td>" . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit"), -class => "list"}, "<b>" .
+                             esc_html(chop_str($co{'title'}, 50)) . "</b>") . "</td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
-                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=blob;hb=$commit;f=$file_name"}, "blob");
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit")}, "commit") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;hb=$commit;f=$file_name")}, "blob");
                        my $blob = git_get_hash_by_path($hash, $file_name);
                        my $blob_parent = git_get_hash_by_path($commit, $file_name);
                        if (defined $blob && defined $blob_parent && $blob ne $blob_parent) {
                                print " | " .
-                               $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$blob;hp=$blob_parent;hb=$commit;f=$file_name"},
+                               $cgi->a({-href => esc_url("$my_uri?p=$project;a=blobdiff;h=$blob;hp=$blob_parent;hb=$commit;f=$file_name")},
                                "diff to current");
                        }
                        print "</td>\n" .
@@ -2050,23 +2110,23 @@ sub git_search {
        }
        git_header_html();
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary;h=$hash"}, "summary") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary;h=$hash")}, "summary") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "shortlog") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
 
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        if ($commit_search) {
                $/ = "\0";
-               open my $fd, "-|", "$gitbin/git-rev-list --header $hash";
+               open my $fd, "-|", "$gitbin/git-rev-list --header --parents $hash" or next;
                while (my $commit_text = <$fd>) {
                        if (!grep m/$searchtext/i, $commit_text) {
                                next;
@@ -2078,8 +2138,7 @@ sub git_search {
                                next;
                        }
                        my @commit_lines = split "\n", $commit_text;
-                       my $commit = shift @commit_lines;
-                       my %co = git_read_commit($commit, \@commit_lines);
+                       my %co = git_read_commit(undef, \@commit_lines);
                        if (!%co) {
                                next;
                        }
@@ -2090,16 +2149,16 @@ sub git_search {
                        }
                        $alternate ^= 1;
                        print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                             "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
+                             "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
                              "<td>" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"}, "<b>" . escapeHTML(chop_str($co{'title'}, 50)) . "</b><br/>");
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$co{'id'}"), -class => "list"}, "<b>" . esc_html(chop_str($co{'title'}, 50)) . "</b><br/>");
                        my $comment = $co{'comment'};
                        foreach my $line (@$comment) {
                                if ($line =~ m/^(.*)($searchtext)(.*)$/i) {
-                                       my $lead = escapeHTML($1) || "";
+                                       my $lead = esc_html($1) || "";
                                        $lead = chop_str($lead, 30, 10);
-                                       my $match = escapeHTML($2) || "";
-                                       my $trail = escapeHTML($3) || "";
+                                       my $match = esc_html($2) || "";
+                                       my $trail = esc_html($3) || "";
                                        $trail = chop_str($trail, 30, 10);
                                        my $text = "$lead<span style=\"color:#e00000\">$match</span>$trail";
                                        print chop_str($text, 80, 5) . "<br/>\n";
@@ -2107,8 +2166,8 @@ sub git_search {
                        }
                        print "</td>\n" .
                              "<td class=\"link\">" .
-                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
-                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$commit"}, "tree");
+                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$co{'id'}")}, "commit") .
+                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$co{'id'}")}, "tree");
                        print "</td>\n" .
                              "</tr>\n";
                }
@@ -2117,7 +2176,7 @@ sub git_search {
 
        if ($pickaxe_search) {
                $/ = "\n";
-               open my $fd, "-|", "$gitbin/git-rev-list $hash | $gitbin/git-diff-tree -r --stdin -S$searchtext";
+               open my $fd, "-|", "$gitbin/git-rev-list $hash | $gitbin/git-diff-tree -r --stdin -S\'$searchtext\'";
                undef %co;
                my @files;
                while (my $line = <$fd>) {
@@ -2143,20 +2202,20 @@ sub git_search {
                                        }
                                        $alternate ^= 1;
                                        print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                                             "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
+                                             "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
                                              "<td>" .
-                                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$co{'id'}", -class => "list"}, "<b>" .
-                                             escapeHTML(chop_str($co{'title'}, 50)) . "</b><br/>");
+                                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$co{'id'}"), -class => "list"}, "<b>" .
+                                             esc_html(chop_str($co{'title'}, 50)) . "</b><br/>");
                                        while (my $setref = shift @files) {
                                                my %set = %$setref;
-                                               print $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$set{'id'};hb=$co{'id'};f=$set{'file'}", class => "list"},
-                                                     "<span style=\"color:#e00000\">" . escapeHTML($set{'file'}) . "</span>") .
+                                               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=blob;h=$set{'id'};hb=$co{'id'};f=$set{'file'}"), class => "list"},
+                                                     "<span style=\"color:#e00000\">" . esc_html($set{'file'}) . "</span>") .
                                                      "<br/>\n";
                                        }
                                        print "</td>\n" .
                                              "<td class=\"link\">" .
-                                             $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$co{'id'}"}, "commit") .
-                                             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$co{'id'}"}, "tree");
+                                             $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$co{'id'}")}, "commit") .
+                                             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$co{'id'}")}, "tree");
                                        print "</td>\n" .
                                              "</tr>\n";
                                }
@@ -2179,12 +2238,12 @@ sub git_shortlog {
        }
        git_header_html();
        print "<div class=\"page_nav\">\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary")}, "summary") .
              " | shortlog" .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
-             " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$hash;hb=$hash"}, "tree") . "<br/>\n";
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=log;h=$hash")}, "log") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$hash")}, "commit") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
+             " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=tree;h=$hash;hb=$hash")}, "tree") . "<br/>\n";
 
        my $limit = sprintf("--max-count=%i", (100 * ($page+1)));
        open my $fd, "-|", "$gitbin/git-rev-list $limit $hash" or die_error(undef, "Open failed.");
@@ -2192,26 +2251,26 @@ sub git_shortlog {
        close $fd;
 
        if ($hash ne $head || $page) {
-               print $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "HEAD");
+               print $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog")}, "HEAD");
        } else {
                print "HEAD";
        }
        if ($page > 0) {
                print " &sdot; " .
-               $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page-1), -accesskey => "p", -title => "Alt-p"}, "prev");
+               $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page-1)), -accesskey => "p", -title => "Alt-p"}, "prev");
        } else {
                print " &sdot; prev";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                print " &sdot; " .
-               $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page+1), -accesskey => "n", -title => "Alt-n"}, "next");
+               $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page+1)), -accesskey => "n", -title => "Alt-n"}, "next");
        } else {
                print " &sdot; next";
        }
        print "<br/>\n" .
              "</div>\n";
        print "<div>\n" .
-             $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
+             $cgi->a({-href => esc_url("$my_uri?p=$project;a=summary"), -class => "title"}, "&nbsp;") .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
@@ -2226,19 +2285,26 @@ sub git_shortlog {
                }
                $alternate ^= 1;
                print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
-                     "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
-                     "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"}, "<b>" .
-                     escapeHTML($co{'title_short'}) . "</b>") . "</td>\n" .
+                     "<td><i>" . esc_html(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
+                     "<td>";
+               if (length($co{'title_short'}) < length($co{'title'})) {
+                       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit"), -class => "list", -title => "$co{'title'}"},
+                             "<b>" . esc_html($co{'title_short'}) . "</b>");
+               } else {
+                       print $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit"), -class => "list"},
+                             "<b>" . esc_html($co{'title_short'}) . "</b>");
+               }
+               print "</td>\n" .
                      "<td class=\"link\">" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
-                     " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$commit"}, "commitdiff") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=commit;h=$commit")}, "commit") .
+                     " | " . $cgi->a({-href => esc_url("$my_uri?p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
                      "</td>\n" .
                      "</tr>";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                print "<tr>\n" .
                      "<td>" .
-                     $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page+1), -title => "Alt-n"}, "next") .
+                     $cgi->a({-href => esc_url("$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page+1)), -title => "Alt-n"}, "next") .
                      "</td>\n" .
                      "</tr>\n";
        }