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File: importerlib.php
<?php
// $Id: /cvsroot/tikiwiki/tiki/lib/importerlib.php,v 1.1.2.2 2007-11-24 19:40:32 kerrnel22 Exp $
//
// Copyright (c)2002-2003
// Luis Argerich, Garland Foster, Eduardo Polidor, et. al.
// All Rights Reserved. See copyright.txt for details and a complete list of
// authors. Licensed under the GNU LESSER GENERAL PUBLIC LICENSE.
// See license.txt for details.

// This script may only be included! Die if called directly...
if (strpos($_SERVER["SCRIPT_NAME"],basename(__FILE__)) !== false) {
	header("location: index.php");
	exit;
}

require_once ('commentslib.php');

// A library to handle importing of forum posts from Tiki or from other forum
// software.  This library will re-use functions contained in the CommentsLib
// library, as those functions already directly access the forums.
class Importer extends Comments {
	// The types of forums are hard-coded into the library and displayed
	// in the template.  As support for more imports grows, add the type to
	// the below two arrays, in addition to writing the functions to 
	// support them.
	var $fi_types    = array('TikiWiki');
	var $fi_prefixes = array('tiki_');

	// Constructor for the Importer library.
	function Importer($db) {
		if (!$db) {
			die ("Invalid db object passed to importerlib constructor.");
		}
		$this->db = $db;
    	}

/*
 * Functions for the forums
 *
 * All functions that begin with "parse" are related to SQL file interaction.
 * Functions that begin with "get" are related to DB interactions.
 *
 */

// importSQLForum will import the forum data from the specified SQL file and
// the specified forum ID, and append it to the end of the data in the 
// destination forum.  Datestamps will be retained.
function importSQLForum($dbType, $dbPrefix, $sqlFile, $fF, $tF) {
	$fHash = array();
	$row = array();
	$hash = array();	// If part of a thread, this is the new parent threadId.

	// Select the table for the main forum information.
	if ($dbType == 'TikiWiki') {
		$table = 'comments';
		$ftable = $dbPrefix . $table;
		$ftable2 = $dbPrefix . 'forums';
	} else {
		return -1;
	}

	// Parse the SQL file and grab all posts for the source forum.
	$fHash = $this->parseSQL($dbType, $dbPrefix, $table, $sqlFile, $fF);
	$fPosts = count($fHash);
	$fPosts2 = $fPosts;
	
	// In order to accommodate out of order posts and still keep integrity
	// with threads, if a record has a parent ID (meaning it is part of a
	// thread), then when looping through the array, stick it on the end
	// and continue with the next one.
	for ($count = 0; $count < $fPosts2; $count++) {
		$row = array_shift($fHash);

		$pid = 0;
		if ($row["parentId"] != 0 && !$hash[$row["parentId"]]) {
				array_push($fHash, $row);
				$fPosts2++;
				continue;
		} else if ($row["parentId"] != 0) {
				$pid = $hash[$row["parentId"]];
		}

		if ($dbType == 'TikiWiki') {
			$query = "insert into
				`tiki_comments` (`objectType`, `object`, `commentDate`,
					`userName`, `title`, `data`, `votes`, `points`, `hash`,
					`parentId`, `average`, `hits`, `type`, `summary`, `user_ip`,
					`message_id`, `in_reply_to`)
				values ( 'forum', '$tF', " . $row["commentDate"] . 
					", \"" . $row["userName"] . "\", \"" . $row["title"] . 
					"\", \"" . $row["data"] . "\", " . (int) $row["votes"] .
					", '" . $row["points"] . "', '" . $row["hash"] . 
					"', $pid, \"" . $row["average"] . "\", " .
					(int) $row["hits"] . ", '" . $row["type"] . "', \"" .
					$row["summary"] . "\", '" . $row["user_ip"] . "', \"" .
					$row["message_id"] . "\", \"" . $row["in_reply_to"] . "\")";
			$result = $this->query($query);

			$abbb = $this->getOne("SELECT LAST_INSERT_ID() from $ftable");
			if (!$abbb) {
				$abbb = $this->getOne("SELECT max(tableId) from $ftable");
			}
			$hash[$row["threadId"]] = $abbb;
		} else {
			die ("Only TikiWiki is supported at this time.\n");
		}
	}

	// Update forum counters.
	$query = "select count(*) from `tiki_comments` where `objectType` = 'forum' and `object` = ?";
	$tComments = $this->getOne($query, array( (int) $tF ));
	$query = "select count(*) from `tiki_comments` where `objectType` = 'forum' and `object` = ? and `parentId` = 0";
	$tThreads = $this->getOne($query, array( (int) $tF ));
	$query = "update `tiki_forums` set `comments` = ?, `threads` = ? where `forumId` = ?";
	$result = $this->query($query, array( (int) $tComments, (int) $tThreads, (int) $tF ));

	// Force an index refresh on comments table.
	include_once("lib/search/refresh-functions.php");
	refresh_index_forums();
	refresh_index('comments');

	return $fPosts;
}


// parseFields will take an entire record, as parsed out from an SQL file,
// and pull out full fields (either text-based with '' or numeric).  What is
// returned is an indexed array of the field data.
function parseFields($record) {
	$fields = array();
	$moo = "\'";

	while ($a = strpos($record, ",")) {
		// If field is a string...
		if (ereg("^'", substr($record, 0, $a))) {
			$offset = 1;
			while ($b = strpos($record, "'", $offset)) {
				// If close quote is not escaped
				if (substr($record, $b - 1, 2) != $moo) {
					array_push($fields, substr($record, 1, $b - 1));
					$record = substr($record, $b + 2);
					break;
				} else {
					$offset = $b + 1;
				}
			}
		// Otherwise, it is numeric.
		} else {
			array_push($fields, substr($record, 0, $a));
			$record = substr($record, $a + 1);
		}	
	}
	array_push($fields, $record);

	return $fields;
}
 

// parseSQL parses the SQL source file, analysing the block of text
// for the specified table, pulling out field names, and all of the
// values from the associated insert actions.  Returns an array of
// associative arrays for each record and the fields within the record.
function parseSQL($dbType, $dbPrefix, $table, $sqlFile, $fId) {

	$headings = array();
	$rec = array();
	$thash = array();

	$fH = fopen($sqlFile, 'r');

	$lookFor1 = "^CREATE TABLE `$dbPrefix" . "$table`";
	$lookFor2 = "^INSERT INTO `$dbPrefix" . "$table`";

	while ($fL = fgets($fH)) {
		// If we find a create table block, parse the
		// entire block.
		if (ereg($lookFor1, $fL)) {
			$fL = fgets($fH);
			while (ereg("^  `", $fL)) {
				$a = substr($fL, 3);
				$b = strpos($a, "`");
				$c = substr($a, 0, $b);

				array_push($headings, $c);
				$fL = fgets($fH);
			}
		}

		// Now that we've parsed the create table block,
		// look for the insert block.
		if (ereg($lookFor2, $fL)) {
			while (ereg($lookFor2, $fL)) {
				$a = strpos($fL, "(");
				$b = strpos($fL, ");\n");
				$c = substr($fL, $a + 1, $b - $a - 1);

				// Do a rudimentary parsing of what generally would be
				// record boundaries, such that each element in $records
				// represents an SQL record or row.
				$records = split('\),\(', $c);
				if (count($records) < 1) { $records[0] = $c; }
				
				for ($count = 0; $count < count($records); $count++) {
					// Each proper record should begin with a numeric value
					// (at least as far as the tables we will be using).
					// Check the following record from the current one to see
					// if it is a proper record.  If it is not, then it is
					// the continuation of the current one, so merge them into
					// the next record, and skip the current one.  Repeat
					// checking the next record until both the current one
					// and its follower are proper.
					while (isset($records[$count + 1]) && !ereg("^[0-9]", $records[$count + 1])) {
						$newrec = $records[$count] . '),(' . $records[$count + 1];
						$count++;
						$records[$count] = $newrec;
					}


					$fields = $this->parseFields($records[$count]);

					// This only supports TikiWiki at this time.  Any other
					// value that manages to get through will simply parse
					// all records without filter.
					if ($dbType == 'TikiWiki') {
						// Ignore records that come back that are not 
						// forum-related.
						if ($fields[2] != "forum" && $table == 'comments') {
							// Do nothing... NEXT!
							continue;
						// If a source forum has been specified, ignore
						// records that are not for that specific forum.
						} else if ($fId && $fields[1] != "$fId" && $table == 'comments') {
							// Do nothing... NEXT!
							continue;
						} else {
							for ($z = 0; $z < count($fields); $z++) {
								$rec[$headings[$z]] = $fields[$z];
							}
							array_push($thash, $rec);
						}
					}

				}
				$fL = fgets($fH);
			}
		}

	}

	return $thash;
}


// parseForumList parses an SQL file and returns an array consisting of all
// the forum ID number and name pairs that exist in the SQL file.
function parseForumList($dbType, $dbPrefix, $sqlFile) {
	$tHash = array();
	$fields = array();
	$forum = array();
	$forums = array();

	// Select the table for the main forum information.
	if ($dbType == 'TikiWiki') {
		$table = 'forums';
	} else {
		return -1;
	}

	$tHash = $this->parseSQL($dbType, $dbPrefix, $table, $sqlFile, null);

	// We only need to key on the forum ID number and the forum name.
	while ($fields = array_shift($tHash)) {
		if ($dbType == 'TikiWiki') {
			$forum["id"] = $fields["forumId"];
			$forum["name"] = $fields["name"];
			$forum["comments"] = $fields["comments"];
			array_push($forums, $forum);
		} else {
			return -1;
		}
	}

	return $forums;
}



}
?>