262 lines
6.8 KiB
Perl
Executable file
262 lines
6.8 KiB
Perl
Executable file
#!/usr/bin/perl
|
|
# A simple web server that just listens for textarea filter requests
|
|
# and runs an editor to manipulate the text. Is intended to be
|
|
# used with the TextAid extention for Chrome.
|
|
#
|
|
# NOTE: If you use this on a shared system, you should configure TextAid
|
|
# with a username & password and make sure that the saved authorization
|
|
# config file stays secret!
|
|
|
|
use strict;
|
|
use warnings;
|
|
use threads;
|
|
use Socket;
|
|
use IO::Select;
|
|
use File::Temp;
|
|
use Getopt::Long;
|
|
|
|
# If you don't want to require authentication, set $REQUIRE_AUTH to 0.
|
|
# When it is set to 1, the first authenticated request that is received
|
|
# will be saved to the $SAVE_AUTH_FILE file. All subsequent requests
|
|
# are compared to that value. To change your password, just remove the
|
|
# file and make a new edit-server request using the new auth info.
|
|
our $REQUIRE_AUTH = 1;
|
|
our $SAVE_AUTH_FILE = "$ENV{HOME}/.edit-server-auth";
|
|
|
|
# Only accept requests from something that claims to be a chrome-extension.
|
|
# Set this to 0 if you want other things to be able to use this script.
|
|
our $REQUIRE_CHROME_EXTENSION = 1;
|
|
|
|
# Configures the port we listen on and if we allow only localhost requests.
|
|
our $PORT = 8888;
|
|
our $LOCALHOST_ONLY = 1;
|
|
|
|
# Configure the program that you want to run to handle the requests.
|
|
# This editor invocation must NOT return control to this script until
|
|
# you are done editing.
|
|
#our $EDITOR_CMD = '/home/users/nico/bin/vim-term "%s"';
|
|
our $EDITOR_CMD = '/usr/bin/emacsclient -c "%s"';
|
|
|
|
# The settings to configure the temp dir and how soon old files are removed.
|
|
# If TMPTEMPLATE contains the string -URL64-, then up to 64 chars of the munged
|
|
# URL for the textarea's page will be included in the tmp file's filename.
|
|
our $TMPDIR = "$ENV{HOME}/.tmp";
|
|
our $TMPTEMPLATE = 'edit-server-URL64-XXXXXX';
|
|
our $TMPSUFFIX = '.txt';
|
|
our $CLEAN_AFTER_HOURS = 4;
|
|
|
|
&Getopt::Long::Configure('bundling');
|
|
GetOptions(
|
|
'verbose|v+' => \( my $verbosity = 0 ),
|
|
'help|h' => \( my $help_opt ),
|
|
) or usage();
|
|
usage() if $help_opt;
|
|
|
|
umask 0077; # Disables all "group" and "other" perms when saving files.
|
|
$| = 1;
|
|
|
|
local *S;
|
|
socket(S, PF_INET, SOCK_STREAM , getprotobyname('tcp')) or die "couldn't open socket: $!\n";
|
|
setsockopt(S, SOL_SOCKET, SO_REUSEADDR, 1);
|
|
if ($LOCALHOST_ONLY) {
|
|
bind(S, sockaddr_in($PORT, INADDR_LOOPBACK));
|
|
} else {
|
|
bind(S, sockaddr_in($PORT, INADDR_ANY));
|
|
}
|
|
listen(S, 5) or die "listen failed: $!\n";
|
|
|
|
my $sel = IO::Select->new();
|
|
$sel->add(*S);
|
|
|
|
while (1) {
|
|
my @con = $sel->can_read();
|
|
foreach my $con (@con) {
|
|
my $fh;
|
|
my $remote = accept($fh, $con);
|
|
my($port, $iaddr) = sockaddr_in($remote);
|
|
my $addr = inet_ntoa($iaddr);
|
|
|
|
my $t = threads->create(\&do_edit, $fh);
|
|
$t->detach();
|
|
}
|
|
}
|
|
|
|
exit;
|
|
|
|
# Read the text from the content body, edit it, and write it back as our output.
|
|
sub do_edit
|
|
{
|
|
my($fh) = @_;
|
|
binmode $fh;
|
|
|
|
local $_ = <$fh>;
|
|
my($method, $path, $ver) = /^(GET|HEAD|POST)\s+(.*?)\s+(HTTP\S+)/;
|
|
print "Path: $path\n" if $verbosity >= 1;
|
|
unless (defined $ver) {
|
|
http_header($fh, 500, 'Invalid request.');
|
|
close $fh;
|
|
return;
|
|
}
|
|
if ($method ne 'POST') {
|
|
http_header($fh, 200, 'OK', 'Server is up and running. To use it, issue a POST request with the file to edit as the content body.');
|
|
close $fh;
|
|
return;
|
|
}
|
|
|
|
my %header;
|
|
|
|
while (<$fh>) {
|
|
s/\r?\n$//;
|
|
last if $_ eq '';
|
|
|
|
my($name, $value) = /^(.*?): +(.*)/;
|
|
$header{lc($name)} = $value;
|
|
print "Header: \L$name\E = $value\n" if $verbosity >= 2;
|
|
}
|
|
print "-------------------------------------------------------------------\n" if $verbosity >= 2;
|
|
|
|
if ($REQUIRE_AUTH) {
|
|
my $authorized;
|
|
my $auth = $header{authorization}; # e.g. "Basic 01234567890ABCDEF=="
|
|
if (defined $auth) {
|
|
my $line;
|
|
if (open AUTH, '<', $SAVE_AUTH_FILE) {
|
|
chomp($line = <AUTH>);
|
|
close AUTH;
|
|
} elsif ($!{ENOENT} && open AUTH, '>', $SAVE_AUTH_FILE) {
|
|
# The first request w/o an auth file saves the auth info.
|
|
print AUTH $auth, "\n";
|
|
close AUTH;
|
|
$line = $auth;
|
|
} else {
|
|
http_header($fh, 501, 'Internal failure -- auth-file failed.');
|
|
close $fh;
|
|
return;
|
|
}
|
|
if ($line eq $auth) {
|
|
$authorized = 1;
|
|
}
|
|
}
|
|
unless ($authorized) {
|
|
http_header($fh, 401, 'Unauthorized!');
|
|
close $fh;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if ($REQUIRE_CHROME_EXTENSION) {
|
|
my $origin = $header{origin};
|
|
unless (defined $origin && $origin =~ /^chrome-extension:/) {
|
|
http_header($fh, 401, 'Unauthorized.');
|
|
close $fh;
|
|
return;
|
|
}
|
|
}
|
|
|
|
my $len = $header{'content-length'};
|
|
unless (defined $len && $len =~ /^\d+$/) {
|
|
http_header($fh, 500, 'Invalid request -- no content-length.');
|
|
close $fh;
|
|
return;
|
|
}
|
|
|
|
my $got = read($fh, $_, $len);
|
|
if ($got != $len) {
|
|
http_header($fh, 500, 'Invalid request -- wrong content-length.');
|
|
close $fh;
|
|
return;
|
|
}
|
|
|
|
my($query) = $path =~ /\?(.+)/;
|
|
(my $template_fn = $TMPTEMPLATE) =~ s/-URL(\d+)-/ '-' . url_filename($query, $1) . '-' /e;
|
|
|
|
my $tmp = new File::Temp(
|
|
TEMPLATE => $template_fn,
|
|
DIR => $TMPDIR,
|
|
SUFFIX => $TMPSUFFIX,
|
|
UNLINK => 0,
|
|
);
|
|
my $name = $tmp->filename;
|
|
|
|
print $tmp $_;
|
|
close $tmp;
|
|
|
|
my $cmd = sprintf($EDITOR_CMD, $name);
|
|
system $cmd;
|
|
|
|
unless (open FILE, '<', $name) {
|
|
http_header($fh, 500, "Unable to re-open $name: $!");
|
|
close $fh;
|
|
return;
|
|
}
|
|
|
|
http_header($fh, 200, 'OK', '');
|
|
print $fh <FILE>;
|
|
|
|
close FILE;
|
|
close $fh;
|
|
|
|
# Clean-up old tmp files that have been around for a few hours.
|
|
if (opendir(DP, $TMPDIR)) {
|
|
(my $match = quotemeta($TMPTEMPLATE . $TMPSUFFIX)) =~ s/(.*[^X])(X+)/ $1 . ('\w' x length($2)) /e;
|
|
$match =~ s/\\-URL\d+\\-/-.*-/;
|
|
print "Match: $match\n" if $verbosity >= 3;
|
|
foreach my $fn (grep /^$match$/o, readdir DP) {
|
|
$fn = "$TMPDIR/$fn";
|
|
print "Fn: $fn\n" if $verbosity >= 3;
|
|
my $age = -M $fn;
|
|
if ($age > $CLEAN_AFTER_HOURS/24) {
|
|
unlink $fn;
|
|
} else {
|
|
print "Age: $age\n" if $verbosity >= 3;
|
|
}
|
|
}
|
|
closedir DP;
|
|
}
|
|
}
|
|
|
|
sub http_header
|
|
{
|
|
my $fh = shift;
|
|
my $status = shift;
|
|
my $status_txt = shift;
|
|
@_ = $status_txt unless @_;
|
|
print $fh "HTTP/1.0 $status $status_txt\r\n",
|
|
"Server: edit-server\r\n",
|
|
"Content-Type: text/plain\r\n",
|
|
"\r\n", @_;
|
|
}
|
|
|
|
sub url_filename
|
|
{
|
|
my($query, $max_chars) = @_;
|
|
print "Query: $query\n" if $verbosity >= 4;
|
|
|
|
if (defined $query) {
|
|
foreach my $var_val (split /&/, $query) {
|
|
my($var, $val) = split /=/, $var_val, 2;
|
|
if ($var eq 'url') {
|
|
print "Before: $val\n" if $verbosity >= 4;
|
|
$val =~ s/\%([0-9a-fA-F]{2})/ chr hex $1 /eg;
|
|
$val =~ s{^https?://}{};
|
|
$val =~ s/[^-\w.]+/_/g;
|
|
$val =~ s/^(.{1,$max_chars}).*/$1/;
|
|
print "After: $val\n" if $verbosity >= 4;
|
|
return $val;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 'unknown-url';
|
|
}
|
|
|
|
sub usage
|
|
{
|
|
die <<EOT;
|
|
Usage: edit-server [OPTIONS]
|
|
|
|
Options:
|
|
-v, --verbose Increase debug verbosity (repeatable)
|
|
-h, --help Output this help message
|
|
EOT
|
|
}
|