# Copyright (C) 2014-2015 all contributors # License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt) # # Main web interface for mailing list archives # # We focus on the lowest common denominators here: # - targeted at text-only console browsers (w3m, links, etc..) # - Only basic HTML, CSS only for line-wrapping
 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 Plack::Request;
use PublicInbox::Config;
use PublicInbox::Hval;
use URI::Escape qw(uri_escape_utf8 uri_unescape);
use constant SSOMA_URL => '//ssoma.public-inbox.org/';
use constant PI_URL => '//public-inbox.org/';
require PublicInbox::Git;
use PublicInbox::GitHTTPBackend;
our $INBOX_RE = qr!\A/([\w\.\-]+)!;
our $MID_RE = qr!([^/]+)!;
our $END_RE = qr!(T/|t/|t\.mbox(?:\.gz)?|t\.atom|raw|)!;
our $ATTACH_RE = qr!(\d[\.\d]*)-([[:alnum:]][\w\.-]+[[:alnum:]])!i;

sub new {
	my ($class, $pi_config) = @_;
	$pi_config ||= PublicInbox::Config->new;
	bless { pi_config => $pi_config }, $class;
}

# backwards compatibility, do not use
sub run {
	my ($req, $method) = @_;
	PublicInbox::WWW->new->call($req->env);
}

sub call {
	my ($self, $env) = @_;
	my $cgi = Plack::Request->new($env);
	my $ctx = { cgi => $cgi, env => $env, www => $self,
		pi_config => $self->{pi_config} };

	# we don't care about multi-value
	my %qp = map {
		my ($k, $v) = split('=', $_, 2);
		$v = '' unless defined $v;
		($k, $v)
	} split(/[&;]/, uri_unescape($env->{QUERY_STRING}));
	$ctx->{qp} = \%qp;

	my $path_info = $env->{PATH_INFO};
	my $method = $env->{REQUEST_METHOD};

	if ($method eq 'POST' &&
		 $path_info =~ m!$INBOX_RE/(git-upload-pack)\z!) {
		my $path = $2;
		return (invalid_inbox($self, $ctx, $1) ||
			serve_git($env, $ctx->{git}, $path));
	}
	elsif ($method !~ /\AGET|HEAD\z/) {
		return r(405, 'Method Not Allowed');
	}

	# top-level indices and feeds
	if ($path_info eq '/') {
		r404();
	} elsif ($path_info =~ m!$INBOX_RE\z!o) {
		invalid_inbox($self, $ctx, $1) || r301($ctx, $1);
	} elsif ($path_info =~ m!$INBOX_RE(?:/|/index\.html)?\z!o) {
		invalid_inbox($self, $ctx, $1) || get_index($ctx);
	} elsif ($path_info =~ m!$INBOX_RE/(?:atom\.xml|new\.atom)\z!o) {
		invalid_inbox($self, $ctx, $1) || get_atom($ctx);

	} elsif ($path_info =~ m!$INBOX_RE/
				($PublicInbox::GitHTTPBackend::ANY)\z!ox) {
		my $path = $2;
		invalid_inbox($self, $ctx, $1) ||
			serve_git($env, $ctx->{git}, $path);
	} elsif ($path_info =~ m!$INBOX_RE/([\w-]+).mbox\.gz\z!o) {
		serve_mbox_range($self, $ctx, $1, $2);
	} elsif ($path_info =~ m!$INBOX_RE/$MID_RE/$END_RE\z!o) {
		msg_page($self, $ctx, $1, $2, $3);

	} elsif ($path_info =~ m!$INBOX_RE/$MID_RE/$ATTACH_RE\z!o) {
		my ($idx, $fn) = ($3, $4);
		invalid_inbox_mid($self, $ctx, $1, $2) ||
			get_attach($ctx, $idx, $fn);
	# in case people leave off the trailing slash:
	} elsif ($path_info =~ m!$INBOX_RE/$MID_RE/(T|t)\z!o) {
		my ($inbox, $mid, $suffix) = ($1, $2, $3);
		$suffix .= $suffix =~ /\A[tT]\z/ ? '/#u' : '/';
		r301($ctx, $inbox, $mid, $suffix);

	} elsif ($path_info =~ m!$INBOX_RE/$MID_RE/R/?\z!o) {
		my ($inbox, $mid) = ($1, $2);
		r301($ctx, $inbox, $mid, '#R');

	} elsif ($path_info =~ m!$INBOX_RE/$MID_RE/f/?\z!o) {
		r301($ctx, $1, $2);

	# convenience redirects order matters
	} elsif ($path_info =~ m!$INBOX_RE/([^/]{2,})\z!o) {
		r301($ctx, $1, $2);

	} else {
		legacy_redirects($self, $ctx, $path_info);
	}
}

# for CoW-friendliness, MOOOOO!
sub preload {
	require PublicInbox::Feed;
	require PublicInbox::View;
	require PublicInbox::Thread;
	require Email::MIME;
	require Digest::SHA;
	require POSIX;

	foreach (qw(PublicInbox::Search PublicInbox::SearchView
			PublicInbox::Mbox IO::Compress::Gzip
			PublicInbox::NewsWWW)) {
		eval "require $_;";
	}
}

# private functions below

sub r404 {
	my ($ctx) = @_;
	if ($ctx && $ctx->{mid}) {
		require PublicInbox::ExtMsg;
		searcher($ctx);
		return PublicInbox::ExtMsg::ext_msg($ctx);
	}
	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_inbox {
	my ($self, $ctx, $inbox) = @_;
	my $obj = $ctx->{pi_config}->lookup_name($inbox);
	if (defined $obj) {
		$ctx->{git_dir} = $obj->{mainrepo};
		$ctx->{git} = $obj->git;
		# for PublicInbox::HTTP::weaken_task:
		$ctx->{cgi}->{env}->{'pi-httpd.inbox'} = $obj;
		$ctx->{-inbox} = $obj;
		$ctx->{inbox} = $inbox;
		return;
	}

	# sometimes linkifiers (not ours!) screw up automatic link
	# generation and link things intended for nntp:// to https?://,
	# so try to infer links and redirect them to the appropriate
	# list URL.
	$self->news_www->call($ctx->{cgi}->{env});
}

# returns undef if valid, array ref response if invalid
sub invalid_inbox_mid {
	my ($self, $ctx, $inbox, $mid) = @_;
	my $ret = invalid_inbox($self, $ctx, $inbox);
	return $ret if $ret;

	$ctx->{mid} = $mid = uri_unescape($mid);
	if ($mid =~ /\A[a-f0-9]{40}\z/) {
		# this is horiffically wasteful for legacy URLs:
		if ($mid = mid2blob($ctx)) {
			require Email::Simple;
			use PublicInbox::MID qw/mid_clean/;
			my $s = Email::Simple->new($mid);
			$ctx->{mid} = mid_clean($s->header('Message-ID'));
		}
	}
	undef;
}

# /$INBOX/new.atom                     -> Atom feed, includes replies
sub get_atom {
	my ($ctx) = @_;
	require PublicInbox::Feed;
	PublicInbox::Feed::generate($ctx);
}

# /$INBOX/?r=$GIT_COMMIT                 -> HTML only
sub get_index {
	my ($ctx) = @_;
	require PublicInbox::Feed;
	my $srch = searcher($ctx);
	footer($ctx);
	if ($ctx->{env}->{QUERY_STRING} =~ /(?:\A|[&;])q=/) {
		require PublicInbox::SearchView;
		PublicInbox::SearchView::sres_top_html($ctx);
	} else {
		PublicInbox::Feed::generate_html_index($ctx);
	}
}

# just returns a string ref for the blob in the current ctx
sub mid2blob {
	my ($ctx) = @_;
	$ctx->{-inbox}->msg_by_mid($ctx->{mid});
}

# /$INBOX/$MESSAGE_ID/raw                    -> raw mbox
sub get_mid_txt {
	my ($ctx) = @_;
	my $x = mid2blob($ctx) or return r404($ctx);
	require PublicInbox::Mbox;
	PublicInbox::Mbox::emit1($ctx, $x);
}

# /$INBOX/$MESSAGE_ID/                   -> HTML content (short quotes)
sub get_mid_html {
	my ($ctx) = @_;
	my $x = mid2blob($ctx) or return r404($ctx);

	require PublicInbox::View;
	my $foot = footer($ctx);
	require Email::MIME;
	my $mime = Email::MIME->new($x);
	searcher($ctx);
	[ 200, [ 'Content-Type' => 'text/html; charset=UTF-8' ],
	  PublicInbox::View::msg_html($ctx, $mime, $foot) ];
}

# /$INBOX/$MESSAGE_ID/t/
sub get_thread {
	my ($ctx, $flat) = @_;
	my $srch = searcher($ctx) or return need_search($ctx);
	require PublicInbox::View;
	my $foot = footer($ctx);
	$ctx->{flat} = $flat;
	PublicInbox::View::thread_html($ctx, $foot, $srch);
}

sub ctx_get {
	my ($ctx, $key) = @_;
	my $val = $ctx->{$key};
	(defined $val && $val ne '') or die "BUG: bad ctx, $key unusable";
	$val;
}

sub footer {
	my ($ctx) = @_;
	return '' unless $ctx;
	my $obj = $ctx->{-inbox} or return '';

	# auto-generate a footer
	chomp(my $desc = $obj->description);
	$desc = PublicInbox::Hval::ascii_html($desc);

	my $urls;
	my @urls = @{$obj->cloneurl};
	my %seen = map { $_ => 1 } @urls;
	my $cgi = $ctx->{cgi};
	my $http = $cgi->base->as_string . $obj->{name};
	$seen{$http} or unshift @urls, $http;
	my $ssoma_url = PublicInbox::Hval::prurl($ctx->{env}, SSOMA_URL);
	if (scalar(@urls) == 1) {
		$urls = "URL for ssoma or git clone --mirror $urls[0]);
	} else {
		$urls = "URLs for ssoma or git clone --mirror\n) .
			join("\n", map { "\tgit clone --mirror $_" } @urls);
	}

	my $addr = $obj->{-primary_address};
	$ctx->{footer} = join("\n",
		'- ' . $desc,
		"A {cgi}->{env}, PI_URL) .
			'">public-inbox, ' .
			'anybody may post in plain-text (not HTML):',
		$addr,
		$urls
	);
}

# search support is optional, returns undef if Xapian is not installed
# or not configured for the given GIT_DIR
sub searcher {
	my ($ctx) = @_;
	eval {
		require PublicInbox::Search;
		$ctx->{srch} = $ctx->{-inbox}->search;
	};
}

sub need_search {
	my ($ctx) = @_;
	my $msg = <Search not available for this
public-inbox
Search is not available for this public-inbox
Return to index
EOF [ 501, [ 'Content-Type' => 'text/html; charset=UTF-8' ], [ $msg ] ]; } # /$INBOX/$MESSAGE_ID/t.mbox -> thread as mbox # /$INBOX/$MESSAGE_ID/t.mbox.gz -> thread as gzipped mbox # note: I'm not a big fan of other compression formats since they're # significantly more expensive on CPU than gzip and less-widely available, # especially on older systems. Stick to zlib since that's what git uses. sub get_thread_mbox { my ($ctx, $sfx) = @_; my $srch = searcher($ctx) or return need_search($ctx); require PublicInbox::Mbox; PublicInbox::Mbox::thread_mbox($ctx, $srch, $sfx); } # /$INBOX/$MESSAGE_ID/t.atom -> thread as Atom feed sub get_thread_atom { my ($ctx) = @_; searcher($ctx) or return need_search($ctx); $ctx->{self_url} = $ctx->{cgi}->uri->as_string; require PublicInbox::Feed; PublicInbox::Feed::generate_thread_atom($ctx); } sub legacy_redirects { my ($self, $ctx, $path_info) = @_; # single-message pages if ($path_info =~ m!$INBOX_RE/m/(\S+)/\z!o) { r301($ctx, $1, $2); } elsif ($path_info =~ m!$INBOX_RE/m/(\S+)/raw\z!o) { r301($ctx, $1, $2, 'raw'); } elsif ($path_info =~ m!$INBOX_RE/f/(\S+)/\z!o) { r301($ctx, $1, $2); # thread display } elsif ($path_info =~ m!$INBOX_RE/t/(\S+)/\z!o) { r301($ctx, $1, $2, 't/#u'); } elsif ($path_info =~ m!$INBOX_RE/t/(\S+)/mbox(\.gz)?\z!o) { r301($ctx, $1, $2, "t.mbox$3"); # even older legacy redirects } elsif ($path_info =~ m!$INBOX_RE/m/(\S+)\.html\z!o) { r301($ctx, $1, $2); } elsif ($path_info =~ m!$INBOX_RE/t/(\S+)\.html\z!o) { r301($ctx, $1, $2, 't/#u'); } elsif ($path_info =~ m!$INBOX_RE/f/(\S+)\.html\z!o) { r301($ctx, $1, $2); } elsif ($path_info =~ m!$INBOX_RE/(?:m|f)/(\S+)\.txt\z!o) { r301($ctx, $1, $2, 'raw'); } elsif ($path_info =~ m!$INBOX_RE/t/(\S+)(\.mbox(?:\.gz)?)\z!o) { r301($ctx, $1, $2, "t$3"); # legacy convenience redirects, order still matters } elsif ($path_info =~ m!$INBOX_RE/m/(\S+)\z!o) { r301($ctx, $1, $2); } elsif ($path_info =~ m!$INBOX_RE/t/(\S+)\z!o) { r301($ctx, $1, $2, 't/#u'); } elsif ($path_info =~ m!$INBOX_RE/f/(\S+)\z!o) { r301($ctx, $1, $2); # some Message-IDs have slashes in them and the HTTP server # may try to be clever and unescape them :< } elsif ($path_info =~ m!$INBOX_RE/(\S+/\S+)/$END_RE\z!o) { msg_page($self, $ctx, $1, $2, $3); # in case people leave off the trailing slash: } elsif ($path_info =~ m!$INBOX_RE/(\S+/\S+)/(T|t)\z!o) { r301($ctx, $1, $2, $3 eq 't' ? 't/#u' : $3); } elsif ($path_info =~ m!$INBOX_RE/(\S+/\S+)/f\z!o) { r301($ctx, $1, $2); } else { $self->news_www->call($ctx->{cgi}->{env}); } } sub r301 { my ($ctx, $inbox, $mid, $suffix) = @_; my $cgi = $ctx->{cgi}; my $obj = $ctx->{-inbox}; unless ($obj) { my $r404 = invalid_inbox($ctx->{www}, $ctx, $inbox); return $r404 if $r404; $obj = $ctx->{-inbox}; } my $url = $obj->base_url($cgi); my $qs = $ctx->{env}->{QUERY_STRING}; $url .= (uri_escape_utf8($mid) . '/') if (defined $mid); $url .= $suffix if (defined $suffix); $url .= "?$qs" if $qs ne ''; [ 301, [ Location => $url, 'Content-Type' => 'text/plain' ], [ "Redirecting to $url\n" ] ] } sub msg_page { my ($self, $ctx, $inbox, $mid, $e) = @_; my $ret; $ret = invalid_inbox_mid($self, $ctx, $inbox, $mid) and return $ret; '' eq $e and return get_mid_html($ctx); 't/' eq $e and return get_thread($ctx); 't.atom' eq $e and return get_thread_atom($ctx); 't.mbox' eq $e and return get_thread_mbox($ctx); 't.mbox.gz' eq $e and return get_thread_mbox($ctx, '.gz'); 'T/' eq $e and return get_thread($ctx, 1); 'raw' eq $e and return get_mid_txt($ctx); # legacy, but no redirect for compatibility: 'f/' eq $e and return get_mid_html($ctx); r404($ctx); } sub serve_git { my ($env, $git, $path) = @_; PublicInbox::GitHTTPBackend::serve($env, $git, $path); } sub serve_mbox_range { my ($self, $ctx, $inbox, $range) = @_; invalid_inbox($self, $ctx, $inbox) || eval { require PublicInbox::Mbox; searcher($ctx); PublicInbox::Mbox::emit_range($ctx, $range); } } sub news_www { my ($self) = @_; my $nw = $self->{news_www}; return $nw if $nw; require PublicInbox::NewsWWW; $self->{news_www} = PublicInbox::NewsWWW->new($self->{pi_config}); } sub get_attach { my ($ctx, $idx, $fn) = @_; require PublicInbox::WwwAttach; PublicInbox::WwwAttach::get_attach($ctx, $idx, $fn); } 1;