+# Copyright (C) 2014, Eric Wong <normalperson@yhbt.net> and all contributors
+# License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt)
+#
+# We focus on the lowest common denominators here:
+# - targeted at text-only console browsers (lynx, w3m, etc..)
+# - Only basic HTML, CSS only for line-wrapping <pre> text content for GUIs
+# - No JavaScript, graphics or icons allowed.
+# - Must not rely on static content
+# - UTF-8 is only for user-content, 7-bit US-ASCII for us
+package PublicInbox::WWW;
+use 5.008;
+use strict;
+use warnings;
+use PublicInbox::Config;
+use URI::Escape qw(uri_escape_utf8 uri_unescape);
+our $LISTNAME_RE = qr!\A/([\w\.\-]+)!;
+our $pi_config;
+BEGIN {
+ $pi_config = PublicInbox::Config->new;
+}
+
+sub run {
+ my ($cgi, $method) = @_;
+ my %ctx;
+ if ($method !~ /\AGET|HEAD\z/) {
+ return r(405, 'Method Not Allowed');
+ }
+ my $path_info = $cgi->path_info;
+
+ # top-level indices and feeds
+ if ($path_info eq '/') {
+ r404();
+ } elsif ($path_info =~ m!$LISTNAME_RE\z!o) {
+ invalid_list(\%ctx, $1) || redirect_list_index(\%ctx, $cgi);
+ } elsif ($path_info =~ m!$LISTNAME_RE(?:/|/index\.html)?\z!o) {
+ invalid_list(\%ctx, $1) || get_index(\%ctx, $cgi, 0);
+ } elsif ($path_info =~ m!$LISTNAME_RE/atom\.xml\z!o) {
+ invalid_list(\%ctx, $1) || get_atom(\%ctx, $cgi, 0);
+
+ # single-message pages
+ } elsif ($path_info =~ m!$LISTNAME_RE/m/(\S+)\.txt\z!o) {
+ invalid_list_mid(\%ctx, $1, $2) || get_mid_txt(\%ctx, $cgi);
+ } elsif ($path_info =~ m!$LISTNAME_RE/m/(\S+)\.html\z!o) {
+ invalid_list_mid(\%ctx, $1, $2) || get_mid_html(\%ctx, $cgi);
+
+ # full-message page
+ } elsif ($path_info =~ m!$LISTNAME_RE/f/(\S+)\.html\z!o) {
+ invalid_list_mid(\%ctx, $1, $2) || get_full_html(\%ctx, $cgi);
+
+ # convenience redirects, order matters
+ } elsif ($path_info =~ m!$LISTNAME_RE/(?:m|f)/(\S+)\z!o) {
+ invalid_list_mid(\%ctx, $1, $2) || redirect_mid(\%ctx, $cgi);
+
+ } else {
+ r404();
+ }
+}
+
+# for CoW-friendliness, MOOOOO!
+sub preload {
+ require PublicInbox::Feed;
+ require PublicInbox::View;
+ require Mail::Thread;
+ require Email::MIME;
+ require Digest::SHA;
+ require POSIX;
+ require XML::Atom::SimpleFeed;
+}
+
+# private functions below
+
+sub r404 { r(404, 'Not Found') }
+
+# simple response for errors
+sub r { [ $_[0], ['Content-Type' => 'text/plain'], [ join(' ', @_, "\n") ] ] }
+
+# returns undef if valid, array ref response if invalid
+sub invalid_list {
+ my ($ctx, $listname) = @_;
+ my $git_dir = $pi_config->get($listname, "mainrepo");
+ if (defined $git_dir) {
+ $ctx->{git_dir} = $git_dir;
+ $ctx->{listname} = $listname;
+ return;
+ }
+ r404();
+}
+
+# returns undef if valid, array ref response if invalid
+sub invalid_list_mid {
+ my ($ctx, $listname, $mid) = @_;
+ my $ret = invalid_list($ctx, $listname, $mid);
+ $ctx->{mid} = uri_unescape($mid) unless $ret;
+ $ret;
+}
+
+# /$LISTNAME/atom.xml -> Atom feed, includes replies
+sub get_atom {
+ my ($ctx, $cgi, $top) = @_;
+ require PublicInbox::Feed;
+ [ 200, [ 'Content-Type' => 'application/xml' ],
+ [ PublicInbox::Feed->generate({
+ git_dir => $ctx->{git_dir},
+ listname => $ctx->{listname},
+ pi_config => $pi_config,
+ cgi => $cgi,
+ top => $top,
+ }) ]
+ ];
+}
+
+# /$LISTNAME/?r=$GIT_COMMIT -> HTML only
+sub get_index {
+ my ($ctx, $cgi, $top) = @_;
+ require PublicInbox::Feed;
+ [ 200, [ 'Content-Type' => 'text/html; charset=UTF-8' ],
+ [ PublicInbox::Feed->generate_html_index({
+ git_dir => $ctx->{git_dir},
+ listname => $ctx->{listname},
+ pi_config => $pi_config,
+ cgi => $cgi,
+ top => $top,
+ }) ]
+ ];
+}
+
+# just returns a string ref for the blob in the current ctx
+sub mid2blob {
+ my ($ctx) = @_;
+ require Digest::SHA;
+ my $hex = Digest::SHA::sha1_hex($ctx->{mid});
+ $hex =~ /\A([a-f0-9]{2})([a-f0-9]{38})\z/i or
+ die "BUG: not a SHA-1 hex: $hex";
+
+ my @cmd = ('git', "--git-dir=$ctx->{git_dir}",
+ qw(cat-file blob), "HEAD:$1/$2");
+ my $cmd = join(' ', @cmd);
+ my $pid = open my $fh, '-|';
+ defined $pid or die "fork failed: $!\n";
+ if ($pid == 0) {
+ open STDERR, '>', '/dev/null'; # ignore errors
+ exec @cmd or die "exec failed: $!\n";
+ } else {
+ my $blob = eval { local $/; <$fh> };
+ close $fh;
+ $? == 0 ? \$blob : undef;
+ }
+}
+
+# /$LISTNAME/m/$MESSAGE_ID.txt -> raw original
+sub get_mid_txt {
+ my ($ctx, $cgi) = @_;
+ my $x = mid2blob($ctx);
+ $x ? [ 200, [ 'Content-Type' => 'text/plain' ], [ $$x ] ] : r404();
+}
+
+# /$LISTNAME/m/$MESSAGE_ID.html -> HTML content (short quotes)
+sub get_mid_html {
+ my ($ctx, $cgi) = @_;
+ my $x = mid2blob($ctx);
+ return r404() unless $x;
+
+ require PublicInbox::View;
+ my $mid_href = PublicInbox::Hval::ascii_html(
+ uri_escape_utf8($ctx->{mid}));
+ my $pfx = "../f/$mid_href.html";
+ require Email::MIME;
+ [ 200, [ 'Content-Type' => 'text/html; charset=UTF-8' ],
+ [ PublicInbox::View->as_html(Email::MIME->new($$x), $pfx) ] ];
+}
+
+# /$LISTNAME/f/$MESSAGE_ID.html -> HTML content (fullquotes)
+sub get_full_html {
+ my ($ctx, $cgi) = @_;
+ my $x = mid2blob($ctx);
+ return r404() unless $x;
+ require PublicInbox::View;
+ require Email::MIME;
+ [ 200, [ 'Content-Type' => 'text/html' ],
+ [ PublicInbox::View->as_html(Email::MIME->new($$x))] ];
+}
+
+sub self_url {
+ my ($cgi) = @_;
+ ref($cgi) eq 'CGI' ? $cgi->self_url : $cgi->uri->as_string;
+}
+
+sub redirect_list_index {
+ my ($ctx, $cgi) = @_;
+ do_redirect(self_url($cgi) . "/");
+}
+
+sub redirect_mid {
+ my ($ctx, $cgi) = @_;
+ my $url = self_url($cgi);
+ $url =~ s!/f/!/m/!;
+ do_redirect($url . '.html');
+}
+
+sub do_redirect {
+ my ($url) = @_;
+ [ 301,
+ [ Location => $url, 'Content-Type' => 'text/plain' ],
+ [ "Redirecting to $url\n" ]
+ ]
+}
+
+1;