<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of importExport, a plugin for DotClear2.
#
# Copyright (c) 2003-2012 Olivier Meunier & Association Dotclear
# Licensed under the GPL version 2.0 license.
# See LICENSE file or
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# -- END LICENSE BLOCK -----------------------------------------
if (!defined('DC_RC_PATH')) { return; }

class dcImportFeed extends dcIeModule
{
	protected $status = false;
	protected $feed_url = '';

	// IPv6 functions (from https://gist.github.com/tbaschak/7866688)
 	private function gethostbyname6($host,$try_a = false) {
        // get AAAA record for $host
        // if $try_a is true, if AAAA fails, it tries for A
        // the first match found is returned
        // otherwise returns false

        $dns = $this->gethostbynamel6($host,$try_a);
        if ($dns == false) {
        	return false;
        }
        else {
        	return $dns[0];
        }
    }
    private function gethostbynamel6($host,$try_a = false) {
        // get AAAA records for $host,
        // if $try_a is true, if AAAA fails, it tries for A
        // results are returned in an array of ips found matching type
        // otherwise returns false

        $dns6 = dns_get_record($host,DNS_AAAA);
        if ($try_a == true) {
            $dns4 = dns_get_record($host,DNS_A);
            $dns = array_merge($dns4,$dns6);
        }
        else {
        	$dns = $dns6;
        }
        $ip6 = array();
        $ip4 = array();
        foreach ($dns as $record) {
            if ($record["type"] == "A") {
                $ip4[] = $record["ip"];
            }
            if ($record["type"] == "AAAA") {
                $ip6[] = $record["ipv6"];
            }
        }
        if (count($ip6) < 1) {
            if ($try_a == true) {
                if (count($ip4) < 1) {
                    return false;
                }
                else {
                    return $ip4;
                }
            }
            else {
                return false;
            }
        }
        else {
            return $ip6;
        }
    }

	public function setInfo()
	{
		$this->type = 'import';
		$this->name = __('RSS or Atom feed import');
		$this->description = __('Add a feed content to the blog.');
	}

	public function process($do)
	{
		if ($do == 'ok') {
			$this->status = true;
			return;
		}

		if (empty($_POST['feed_url'])) {
			return;
		}

		$this->feed_url = $_POST['feed_url'];

		// Check feed URL
		if ($this->core->blog->settings->system->import_feed_url_control) {
			// Get IP from URL
			$bits = parse_url($this->feed_url);
			if (!$bits || !isset($bits['host'])) {
				throw new Exception(__('Cannot retrieve feed URL.'));
			}
			$ip = gethostbyname($bits['host']);
			if ($ip == $bits['host']) {
				$ip = $this->gethostbyname6($bits['host']);
				if (!$ip) {
					throw new Exception(__('Cannot retrieve feed URL.'));
				}
			}
			// Check feed IP
			$flag = FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6;
			if ($this->core->blog->settings->system->import_feed_no_private_ip) {
				$flag |= FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE;
			}
			if (!filter_var($ip,$flag)) {
				throw new Exception(__('Cannot retrieve feed URL.'));
			}
			// IP control (white list regexp)
			if ($this->core->blog->settings->system->import_feed_ip_regexp != '') {
				if (!preg_match($this->core->blog->settings->system->import_feed_ip_regexp,$ip)) {
					throw new Exception(__('Cannot retrieve feed URL.'));
				}
			}
			// Port control (white list regexp)
			if ($this->core->blog->settings->system->import_feed_port_regexp != '' && isset($bits['port'])) {
				if (!preg_match($this->core->blog->settings->system->import_feed_port_regexp,$bits['port'])) {
					throw new Exception(__('Cannot retrieve feed URL.'));
				}
			}
		}

		$feed = feedReader::quickParse($this->feed_url);
		if ($feed === false) {
			throw new Exception(__('Cannot retrieve feed URL.'));
		}
		if (count($feed->items) == 0) {
			throw new Exception(__('No items in feed.'));
		}

		$cur = $this->core->con->openCursor($this->core->prefix.'post');
		$this->core->con->begin();
		foreach ($feed->items as $item)
		{
			$cur->clean();
			$cur->user_id = $this->core->auth->userID();
			$cur->post_content = $item->content ? $item->content : $item->description;
			$cur->post_title = $item->title ? $item->title : text::cutString(html::clean($cur->post_content),60);
			$cur->post_format = 'xhtml';
			$cur->post_status = -2;
			$cur->post_dt = strftime('%Y-%m-%d %H:%M:%S',$item->TS);

			try {
				$post_id = $this->core->blog->addPost($cur);
			} catch (Exception $e) {
				$this->core->con->rollback();
				throw $e;
			}

			foreach ($item->subject as $subject) {
				$this->core->meta->setPostMeta($post_id,'tag',dcMeta::sanitizeMetaID($subject));
			}
		}

		$this->core->con->commit();
		http::redirect($this->getURL().'&do=ok');

	}

	public function gui()
	{
		if ($this->status) {
			dcPage::success(__('Content successfully imported.'));
		}

		echo
		'<form action="'.$this->getURL(true).'" method="post">'.
		'<p>'.sprintf(__('Add a feed content to the current blog: <strong>%s</strong>.'),html::escapeHTML($this->core->blog->name)).'</p>'.

		'<p><label for="feed_url">'.__('Feed URL:').'</label>'.
		form::field('feed_url',50,300,html::escapeHTML($this->feed_url)).'</p>'.

		'<p>'.
		$this->core->formNonce().
		form::hidden(array('do'),1).
		'<input type="submit" value="'.__('Import').'" /></p>'.

		'</form>';
	}
}