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| | # Copyright (C) 2016-2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
#
# Atom body stream for which yields getline+close methods
# public-inbox-httpd favors "getline" response bodies to take a
# "pull"-based approach to feeding slow clients (as opposed to a
# more common "push" model)
package PublicInbox::WwwAtomStream;
use strict;
use warnings;
use POSIX qw(strftime);
use Digest::SHA qw(sha1_hex);
use PublicInbox::Address;
use PublicInbox::Hval qw(ascii_html mid_href);
use PublicInbox::MsgTime qw(msg_timestamp);
use PublicInbox::GzipFilter qw(gzf_maybe);
# called by PSGI server after getline:
sub close {}
sub new {
my ($class, $ctx, $cb) = @_;
$ctx->{feed_base_url} = $ctx->{-inbox}->base_url($ctx->{env});
bless { cb => $cb || \&close, ctx => $ctx, emit_header => 1 }, $class;
}
sub response {
my ($class, $ctx, $code, $cb) = @_;
my $h = [ 'Content-Type' => 'application/atom+xml' ];
my $self = $class->new($ctx, $cb);
$self->{gzf} = gzf_maybe($h, $ctx->{env});
[ $code, $h, $self ]
}
# called once for each message by PSGI server
sub getline {
my ($self) = @_;
my $buf = do {
if (my $middle = $self->{cb}) {
my $smsg = $middle->($self->{ctx});
feed_entry($self, $smsg) if $smsg;
}
} // (delete($self->{cb}) ? '</feed>' : undef);
# gzf may be GzipFilter, `undef' or `0'
my $gzf = $self->{gzf} or return $buf;
return $gzf->translate($buf) if defined $buf;
$self->{gzf} = 0; # next call to ->getline returns $buf (== undef)
$gzf->translate(undef);
}
# private
sub title_tag {
my ($title) = @_;
$title =~ tr/\t\n / /s; # squeeze spaces
# try to avoid the type attribute in title:
$title = ascii_html($title);
my $type = index($title, '&') >= 0 ? "\ntype=\"html\"" : '';
"<title$type>$title</title>";
}
sub to_uuid ($) {
my ($any) = @_;
utf8::encode($any); # really screwed up In-Reply-To fields exist
$any = sha1_hex($any);
my $h = '[a-f0-9]';
my (@uuid5) = ($any =~ m!\A($h{8})($h{4})($h{4})($h{4})($h{12})!o);
'urn:uuid:' . join('-', @uuid5);
}
sub atom_header {
my ($ctx, $title) = @_;
my $ibx = $ctx->{-inbox};
my $base_url = $ctx->{feed_base_url};
my $search_q = $ctx->{search_query};
my $self_url = $base_url;
my $mid = $ctx->{mid};
my $page_id;
if (defined $mid) { # per-thread
$self_url .= mid_href($mid).'/t.atom';
$page_id = to_uuid("t\n".$mid)
} elsif (defined $search_q) {
my $query = $search_q->{'q'};
$title = title_tag("$query - search results");
$base_url .= '?' . $search_q->qs_html(x => undef);
$self_url .= '?' . $search_q->qs_html;
$page_id = to_uuid("q\n".$query);
} else {
$title = title_tag($ibx->description);
$self_url .= 'new.atom';
$page_id = "mailto:$ibx->{-primary_address}";
}
my $mtime = (stat($ibx->{inboxdir}))[9] || time;
qq(<?xml version="1.0" encoding="us-ascii"?>\n) .
qq(<feed\nxmlns="http://www.w3.org/2005/Atom"\n) .
qq(xmlns:thr="http://purl.org/syndication/thread/1.0">) .
qq{$title} .
qq(<link\nrel="alternate"\ntype="text/html") .
qq(\nhref="$base_url"/>) .
qq(<link\nrel="self"\nhref="$self_url"/>) .
qq(<id>$page_id</id>) .
feed_updated(gmtime($mtime));
}
# returns undef or string
sub feed_entry {
my ($self, $smsg) = @_;
my $ctx = $self->{ctx};
my $eml = $ctx->{-inbox}->smsg_eml($smsg) or return '';
my $hdr = $eml->header_obj;
my $mid = $smsg->{mid};
my $irt = PublicInbox::View::in_reply_to($hdr);
my $uuid = to_uuid($mid);
my $base = $ctx->{feed_base_url};
if (defined $irt) {
my $irt_uuid = to_uuid($irt);
$irt = mid_href($irt);
$irt = qq(<thr:in-reply-to\nref="$irt_uuid"\n).
qq(href="$base$irt/"/>);
} else {
$irt = '';
}
my $href = $base . mid_href($mid) . '/';
my $t = msg_timestamp($hdr);
my @t = gmtime(defined $t ? $t : time);
my $updated = feed_updated(@t);
my $title = $hdr->header('Subject');
$title = '(no subject)' unless defined $title && $title ne '';
$title = title_tag($title);
my $from = $hdr->header('From') or return;
my ($email) = PublicInbox::Address::emails($from);
my $name = join(', ',PublicInbox::Address::names($from));
$name = ascii_html($name);
$email = ascii_html($email);
my $s = '';
if (delete $self->{emit_header}) {
$s .= atom_header($ctx, $title);
}
$s .= "<entry><author><name>$name</name><email>$email</email>" .
"</author>$title$updated" .
qq(<link\nhref="$href"/>).
"<id>$uuid</id>$irt" .
qq{<content\ntype="xhtml">} .
qq{<div\nxmlns="http://www.w3.org/1999/xhtml">} .
qq(<pre\nstyle="white-space:pre-wrap">);
$ctx->{obuf} = \$s;
$ctx->{mhref} = $href;
PublicInbox::View::multipart_text_as_html($eml, $ctx);
delete $ctx->{obuf};
$s .= '</pre></div></content></entry>';
}
sub feed_updated {
'<updated>' . strftime('%Y-%m-%dT%H:%M:%SZ', @_) . '</updated>';
}
1;
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