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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>
# For retrieving attachments from messages in the WWW interface
package PublicInbox::WwwAttach; # internal package
use strict;
use parent qw(PublicInbox::GzipFilter);
use bytes (); # only for bytes::length
use PublicInbox::EmlContentFoo qw(parse_content_type);
use PublicInbox::Eml;
sub get_attach_i { # ->each_part callback
my ($part, $depth, $idx) = @{$_[0]};
my $ctx = $_[1];
return if $idx ne $ctx->{idx}; # [0-9]+(?:\.[0-9]+)+
my $res = $ctx->{res};
$res->[0] = 200;
my $ct = $part->content_type;
$ct = parse_content_type($ct) if $ct;
if ($ct && (($ct->{type} || '') eq 'text')) {
# display all text as text/plain:
my $cset = $ct->{attributes}->{charset};
if ($cset && ($cset =~ /\A[a-zA-Z0-9_\-]+\z/)) {
$res->[1]->[1] .= qq(; charset=$cset);
}
$ctx->{gz} = PublicInbox::GzipFilter::gz_or_noop($res->[1],
$ctx->{env});
$part = $ctx->zflush($part->body);
} else { # TODO: allow user to configure safe types
$res->[1]->[1] = 'application/octet-stream';
$part = $part->body;
}
push @{$res->[1]}, 'Content-Length', bytes::length($part);
$res->[2]->[0] = $part;
}
sub async_eml { # for async_blob_cb
my ($ctx, $eml) = @_;
eval { $eml->each_part(\&get_attach_i, $ctx, 1) };
if ($@) {
$ctx->{res}->[0] = 500;
warn "E: $@";
}
}
sub async_next {
my ($http) = @_;
my $ctx = $http->{forward} or return; # client aborted
# finally, we call the user-supplied callback
eval { $ctx->{wcb}->($ctx->{res}) };
warn "E: $@" if $@;
}
sub scan_attach ($) { # public-inbox-httpd only
my ($ctx) = @_;
$ctx->{env}->{'psgix.io'}->{forward} = $ctx;
$ctx->smsg_blob($ctx->{smsg});
}
# /$LISTNAME/$MESSAGE_ID/$IDX-$FILENAME
sub get_attach ($$$) {
my ($ctx, $idx, $fn) = @_;
$ctx->{res} = [ 404, [ 'Content-Type' => 'text/plain' ],
[ "Not found\n" ] ];
$ctx->{idx} = $idx;
bless $ctx, __PACKAGE__;
my $eml;
if ($ctx->{smsg} = $ctx->{-inbox}->smsg_by_mid($ctx->{mid})) {
return sub { # public-inbox-httpd-only
$ctx->{wcb} = $_[0];
scan_attach($ctx);
} if $ctx->{env}->{'pi-httpd.async'};
# generic PSGI:
$eml = $ctx->{-inbox}->smsg_eml($ctx->{smsg});
} elsif (!$ctx->{-inbox}->over) {
if (my $bref = $ctx->{-inbox}->msg_by_mid($ctx->{mid})) {
$eml = PublicInbox::Eml->new($bref);
}
}
$eml->each_part(\&get_attach_i, $ctx, 1) if $eml;
$ctx->{res}
}
1;
|