/usr/share/perl5/LWP/Protocol/file.pm is in libwww-perl 6.08-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | package LWP::Protocol::file;
require LWP::Protocol;
@ISA = qw(LWP::Protocol);
use strict;
require LWP::MediaTypes;
require HTTP::Request;
require HTTP::Response;
require HTTP::Status;
require HTTP::Date;
sub request
{
my($self, $request, $proxy, $arg, $size) = @_;
$size = 4096 unless defined $size and $size > 0;
# check proxy
if (defined $proxy)
{
return HTTP::Response->new( &HTTP::Status::RC_BAD_REQUEST,
'You can not proxy through the filesystem');
}
# check method
my $method = $request->method;
unless ($method eq 'GET' || $method eq 'HEAD') {
return HTTP::Response->new( &HTTP::Status::RC_BAD_REQUEST,
'Library does not allow method ' .
"$method for 'file:' URLs");
}
# check url
my $url = $request->uri;
my $scheme = $url->scheme;
if ($scheme ne 'file') {
return HTTP::Response->new( &HTTP::Status::RC_INTERNAL_SERVER_ERROR,
"LWP::Protocol::file::request called for '$scheme'");
}
# URL OK, look at file
my $path = $url->file;
# test file exists and is readable
unless (-e $path) {
return HTTP::Response->new( &HTTP::Status::RC_NOT_FOUND,
"File `$path' does not exist");
}
unless (-r _) {
return HTTP::Response->new( &HTTP::Status::RC_FORBIDDEN,
'User does not have read permission');
}
# looks like file exists
my($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$filesize,
$atime,$mtime,$ctime,$blksize,$blocks)
= stat(_);
# XXX should check Accept headers?
# check if-modified-since
my $ims = $request->header('If-Modified-Since');
if (defined $ims) {
my $time = HTTP::Date::str2time($ims);
if (defined $time and $time >= $mtime) {
return HTTP::Response->new( &HTTP::Status::RC_NOT_MODIFIED,
"$method $path");
}
}
# Ok, should be an OK response by now...
my $response = HTTP::Response->new( &HTTP::Status::RC_OK );
# fill in response headers
$response->header('Last-Modified', HTTP::Date::time2str($mtime));
if (-d _) { # If the path is a directory, process it
# generate the HTML for directory
opendir(D, $path) or
return HTTP::Response->new( &HTTP::Status::RC_INTERNAL_SERVER_ERROR,
"Cannot read directory '$path': $!");
my(@files) = sort readdir(D);
closedir(D);
# Make directory listing
require URI::Escape;
require HTML::Entities;
my $pathe = $path . ( $^O eq 'MacOS' ? ':' : '/');
for (@files) {
my $furl = URI::Escape::uri_escape($_);
if ( -d "$pathe$_" ) {
$furl .= '/';
$_ .= '/';
}
my $desc = HTML::Entities::encode($_);
$_ = qq{<LI><A HREF="$furl">$desc</A>};
}
# Ensure that the base URL is "/" terminated
my $base = $url->clone;
unless ($base->path =~ m|/$|) {
$base->path($base->path . "/");
}
my $html = join("\n",
"<HTML>\n<HEAD>",
"<TITLE>Directory $path</TITLE>",
"<BASE HREF=\"$base\">",
"</HEAD>\n<BODY>",
"<H1>Directory listing of $path</H1>",
"<UL>", @files, "</UL>",
"</BODY>\n</HTML>\n");
$response->header('Content-Type', 'text/html');
$response->header('Content-Length', length $html);
$html = "" if $method eq "HEAD";
return $self->collect_once($arg, $response, $html);
}
# path is a regular file
$response->header('Content-Length', $filesize);
LWP::MediaTypes::guess_media_type($path, $response);
# read the file
if ($method ne "HEAD") {
open(F, $path) or return new
HTTP::Response(&HTTP::Status::RC_INTERNAL_SERVER_ERROR,
"Cannot read file '$path': $!");
binmode(F);
$response = $self->collect($arg, $response, sub {
my $content = "";
my $bytes = sysread(F, $content, $size);
return \$content if $bytes > 0;
return \ "";
});
close(F);
}
$response;
}
1;
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