# Copyright (C) 2015-2020 all contributors # License: AGPL-3.0+ package PublicInbox::MboxGz; use strict; use warnings; use Email::Simple; use PublicInbox::Hval qw/to_filename/; use PublicInbox::Mbox; use Compress::Raw::Zlib qw(Z_FINISH Z_OK); my %OPT = (-WindowBits => 15 + 16, -AppendOutput => 1); sub new { my ($class, $ctx, $cb) = @_; $ctx->{base_url} = $ctx->{-inbox}->base_url($ctx->{env}); my ($gz, $err) = Compress::Raw::Zlib::Deflate->new(%OPT); $err == Z_OK or die "Deflate->new failed: $err"; bless { gz => $gz, cb => $cb, ctx => $ctx }, $class; } sub response { my ($class, $ctx, $cb, $fn) = @_; my $body = $class->new($ctx, $cb); # http://www.iana.org/assignments/media-types/application/gzip $fn = defined($fn) && $fn ne '' ? to_filename($fn) : 'no-subject'; my $h = [ qw(Content-Type application/gzip), 'Content-Disposition', "inline; filename=$fn.mbox.gz" ]; [ 200, $h, $body ]; } sub gzip_fail ($$) { my ($ctx, $err) = @_; $ctx->{env}->{'psgi.errors'}->print("deflate failed: $err\n"); ''; } # called by Plack::Util::foreach or similar sub getline { my ($self) = @_; my $ctx = $self->{ctx} or return; my $gz = $self->{gz}; my $buf = delete($self->{buf}); while (my $smsg = $self->{cb}->($ctx)) { my $mref = $ctx->{-inbox}->msg_by_smsg($smsg) or next; my $h = Email::Simple->new($mref)->header_obj; my $err = $gz->deflate( PublicInbox::Mbox::msg_hdr($ctx, $h, $smsg->{mid}), $buf); return gzip_fail($ctx, $err) if $err != Z_OK; $err = $gz->deflate(PublicInbox::Mbox::msg_body($$mref), $buf); return gzip_fail($ctx, $err) if $err != Z_OK; return $buf if length($buf) >= 8192; # be fair to other clients on public-inbox-httpd: $self->{buf} = $buf; return ''; } # signal that we're done and can return undef next call: delete $self->{ctx}; my $err = $gz->flush($buf, Z_FINISH); ($err == Z_OK) ? $buf : gzip_fail($ctx, $err); } sub close {} # noop 1;