user/dev discussion of public-inbox itself
 help / color / mirror / code / Atom feed
blob c407e343fdac6afb614f3babbd02421f4b7331b6 4777 bytes (raw)
name: lib/PublicInbox/WwwAtomStream.pm 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
 
# 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;

debug log:

solving c407e343f ...
found c407e343f in https://80x24.org/public-inbox.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://80x24.org/public-inbox.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).