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simple_http_wget.pm
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simple_http_wget.pm
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# Copyright (c) Quentin Sculo <squentin@free.fr>
# Copyright (c) Alexandr Savca <alexandr.savca89@gmail.com>
#
# This file is part of jukebox.
#
# jukebox is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation
package Simple_http;
use strict;
use warnings;
# for WNOHANG in waitpid
use POSIX ':sys_wait_h';
use IO::Handle;
my $UseCache = *GMB::Cache::add{CODE};
my $orig_proxy = $ENV{http_proxy};
my $gzip_ok;
BEGIN {
eval {
require IO::Uncompress::Gunzip;
$gzip_ok = 1;
};
}
sub get_with_cb {
my $self = bless {};
my %params = @_;
$self->{params} = \%params;
my ($callback, $url, $post) = @params{qw(cb url post)};
delete $params{cache} unless $UseCache;
if (my $cached = $params{cache} && GMB::Cache::get($url)) {
warn "cached result\n" if $::debug;
Glib::Timeout->add(
10,
sub {
$callback->(
${$cached->{data}},
type => $cached->{type},
filename => $cached->{filename},
);
0;
}
);
return $self;
}
warn "simple_http_wget : fetching $url\n" if $::debug;
my $proxy =
$::Options{Simplehttp_Proxy}
? $::Options{Simplehttp_ProxyHost} . ':' .
($::Options{Simplehttp_ProxyPort} || 3128)
: $orig_proxy;
$ENV{http_proxy} = $proxy;
my $useragent = $params{user_agent} || 'Mozilla/5.0';
my $accept = $params{'accept'} || '';
my $gzip = $gzip_ok ? '--header=Accept-Encoding: gzip' : '';
my @cmd_and_args = (
qw(wget --timeout=40 -S -O -),
$gzip, "--header=Accept: $accept",
"--user-agent=$useragent"
);
push @cmd_and_args, "--referer=$params{referer}" if $params{referer};
push @cmd_and_args, '--post-data=' . $post
if $post; # FIXME: not sure if we shouldn't escape something
push @cmd_and_args, '--', $url;
pipe my ($content_fh), my $wfh;
pipe my ($error_fh), my $ewfh;
my $pid = fork;
if (!defined $pid) {
warn "simple_http_wget : fork failed : $!\n";
Glib::Timeout->add(10, sub { $callback->(); 0 });
return $self;
}
elsif ($pid == 0) {
# child
close $content_fh;
close $error_fh;
open my ($olderr), ">&", \*STDERR;
open \*STDOUT, '>&=' . fileno $wfh;
open \*STDERR, '>&=' . fileno $ewfh;
exec @cmd_and_args
or print $olderr "launch failed (@cmd_and_args) : $!\n";
POSIX::_exit(1);
}
close $wfh;
close $ewfh;
$content_fh->blocking(0); #set non-blocking IO
$error_fh->blocking(0);
$self->{content_fh} = $content_fh;
$self->{error_fh} = $error_fh;
$self->{pid} = $pid;
$self->{content} = $self->{ebuffer} = '';
$self->{watch} = Glib::IO->add_watch(
fileno($content_fh),
[qw/hup err in/],
\&receiving_cb,
$self
);
$self->{ewatch} = Glib::IO->add_watch(
fileno($error_fh),
[qw/hup err in/],
\&receiving_e_cb,
$self
);
return $self;
}
sub receiving_e_cb {
my $self = $_[2];
return 1
if read $self->{error_fh}, $self->{ebuffer}, 1024,
length($self->{ebuffer});
close $self->{error_fh};
while (waitpid(-1, WNOHANG) > 0) { } # reap dead children
return $self->{ewatch} = 0;
}
sub receiving_cb {
my $self = $_[2];
return 1
if read $self->{content_fh}, $self->{content}, 1024,
length($self->{content});
close $self->{content_fh};
while (waitpid(-1, WNOHANG) > 0) { } #reap dead children
$self->{pid} = $self->{sock} = $self->{watch} = undef;
my $url = $self->{params}{url};
my $callback = $self->{params}{cb};
my $type;
my $result = '';
$url = $1 while $self->{ebuffer} =~ m#^Location: (\w+://[^ ]+)#mg;
$type = $1 while $self->{ebuffer} =~ m#^ Content-Type: (.*)$#mg; ##
$result = $1 while $self->{ebuffer} =~ m#^ (HTTP/1\.\d+.*)$#mg; ##
#warn $self->{ebuffer};
my $filename;
while ($self->{ebuffer}
=~ m#^ Content-Disposition:\s*\w+\s*;\s*filename(\*)?=(.*)$#mgi)
{
$filename = $2;
my $rfc5987 = $1;
# decode filename, not perfectly, but good enough
# (http://greenbytes.de/tech/tc2231/ is a good reference)
$filename =~ s#\\(.)#"\x00".ord($1)."\x00"#ge;
my $enc = 'iso-8859-1';
# RFC5987
if ($rfc5987 && $filename =~ s#^([A-Za-z0-9_-]+)'\w*'##) {
$enc = $1;
$filename = ::decode_url($filename);
}
else {
if ($filename =~ s/^"(.*)"$/$1/) {
$filename =~ s#\x00(\d+)\x00#chr($1)#ge;
$filename =~ s#\\(.)#"\x00".ord($1)."\x00"#ge;
}
elsif ($filename =~ m#[^A-Za-z0-9_.\x00-]#) { $filename = '' }
}
$filename =~ s#\x00(\d+)\x00#chr($1)#ge;
$filename = eval { Encode::decode($enc, $filename) };
}
my ($enc) = $self->{ebuffer} =~ m#^ Content-Encoding:\s*(.*)#mg;
if ($enc) {
if ($enc eq 'gzip' && $gzip_ok) {
my $gzipped = $self->{content};
IO::Uncompress::Gunzip::gunzip(\$gzipped, \$self->{content})
or do {
warn
"simple_http_wget : gunzip failed: $IO::Uncompress::Gunzip::GunzipError\n";
$result = 'gunzip error';
};
}
else {
warn "simple_http_wget : can't decode '$enc' encoding\n";
$result = 'encoded';
}
}
if ($result =~ m#^HTTP/1\.\d+ 200 OK#) {
my $response = \$self->{content};
if ($self->{params}{cache} && defined $$response) {
GMB::Cache::add(
$url,
{ data => $response,
type => $type,
size => length($$response),
filename => $filename
}
);
}
$callback->(
$$response,
type => $type,
url => $self->{params}{url},
filename => $filename
);
}
else {
warn "Error fetching $url : $result\n";
$callback->(undef, error => $result);
}
return $self->{watch} = 0;
}
sub progress {
my $self = shift;
my $length;
$length = $1 while $self->{ebuffer} =~ m/Content-Length:\s*(\d+)/ig;
my $size = length $self->{content};
my $progress;
if ($length && $size) {
$progress = $size / $length;
$progress = undef if $progress > 1;
}
# $progress is undef or between 0 and 1
return $progress, $size;
}
sub abort {
my $self = $_[0];
Glib::Source->remove($self->{watch}) if $self->{watch};
Glib::Source->remove($self->{ewatch}) if $self->{ewatch};
kill INT => $self->{pid} if $self->{pid};
close $self->{content_fh} if defined $self->{content_fh};
close $self->{error_fh} if defined $self->{error_fh};
while (waitpid(-1, WNOHANG) > 0) { } #reap dead children
$self->{pid} = $self->{content_fh} = $self->{error_fh} = $self->{watch} =
$self->{ewatch} = undef;
}
1;
# vim:sw=4:ts=4:sts=4:et:cc=72:tw=70
# End of file.