#!/usr/bin/perl -w
#
# Copyright (C) 2004  Alex Schroeder <alex@emacswiki.org>
# Copyright (C) 2006  Alexandre (adulau) Dulaunoy
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;
use Getopt::Std;
use LWP::UserAgent;

my $usage = "$0 TARGET PAGENAME [USERNAME] [PASSWORD]\n"
  . "Where TARGET is the base URL for the wiki.\n"
  . "PAGENAME is the name of the page to be modified.\n"
  . "USERNAME is the username to use for the edit.\n"
  . "PASSWORD is the password to use if required.\n"
  . "Example:\n"
  . "echo this will be appended | $0 http://localhost/cgi-bin/wiki.pl \"My Cool Page\" MyName TheEditPassWord\n\n";

sub UrlEncode {
  my $str = shift;
  return '' unless $str;
  my @letters = split(//, $str);
  my @safe = ('a' .. 'z', 'A' .. 'Z', '0' .. '9', '-', '_', '.', '!',
	      '~', '*', "'", '(', ')', '#');
  foreach my $letter (@letters) {
    my $pattern = quotemeta($letter);
    if (not grep(/$pattern/, @safe)) {
      $letter = sprintf("%%%02x", ord($letter));
    }
  }
  return join('', @letters);
}

sub GetRaw {
  my ($uri) = @_;
  my $ua = LWP::UserAgent->new;
  my $response = $ua->get($uri);
  return $response->content if $response->is_success;
}

sub PostRaw {
  my ($uri, $id, $data, $user, $pwd) = @_;
  my $ua = LWP::UserAgent->new;
  my $response = $ua->post($uri, {title=>$id, text=>$data, raw=>1,
				  username=>$user, pwd=>$pwd});
  warn "POST $id failed.\n" unless $response->is_success;
}

sub append {
  my ($target, $page, $user, $pwd) = @_;
  $page =~ s/ /_/g;
  $page = UrlEncode ($page);
  my $data = GetRaw("$target?action=browse;id=$page;raw=1");
  $data .= <STDIN>;
  PostRaw($target, $page, $data, $user, $pwd);
}

sub main {
  my ($target, $page, $user, $pwd) = @ARGV;
  die $usage unless $target;
  die $usage unless $page;
  append($target, $page, $user, $pwd);
}

main();