<?php
// WebSVN - Subversion repository viewing via the web using PHP
// Copyright (C) 2004-2006 Tim Armes
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// --
//
// log.php
//
// Show the logs for the given path

require_once 'include/setup.php';
require_once 'include/svnlook.php';
require_once 'include/utils.php';
require_once 'include/template.php';
require_once 'include/bugtraq.php';

$page = (int)@$_REQUEST['page'];
$all = @$_REQUEST['all'] == 1;
$isDir = @$_REQUEST['isdir'] == 1 || $path == '' || $path == '/';

if (isset($_REQUEST['showchanges']))
{
	$showchanges = @$_REQUEST['showchanges'] == 1;
}
else
{
	$showchanges = $rep->logsShowChanges();
}

$search = trim(@$_REQUEST['search']);
$dosearch = strlen($search) > 0;

$words = preg_split('#\s+#', $search);
$fromRev = (int)@$_REQUEST['fr'];
$startrev = strtoupper(trim(@$_REQUEST['sr']));
$endrev = strtoupper(trim(@$_REQUEST['er']));
$max = isset($_REQUEST['max']) ? (int)$_REQUEST['max'] : false;

// Max number of results to find at a time
$numSearchResults = 20;

if ($search == '') 
{
	$dosearch = false;
}

// removeAccents
//
// Remove all the accents from a string. This function doesn't seem
// ideal, but expecting everyone to install 'unac' seems a little
// excessive as well...

function removeAccents($string) 
{
	$string = htmlentities($string, ENT_QUOTES, 'ISO-8859-1');
	$string = preg_replace('/&([A-Za-z])(acute|uml|circ|grave|ring|cedil|slash|tilde|caron);/', '$1', $string);
	return $string;
}

// Normalise the search words
foreach ($words as $index => $word) 
{
	$words[$index] = strtolower(removeAccents($word));

	// Remove empty string introduced by multiple spaces
	if (empty($words[$index]))
		unset($words[$index]);
}

if (empty($page))
{
	$page = 1;
}

// If searching, display all the results
if ($dosearch)
{
	$all = true;
}

$maxperpage = 20;

// Make sure that we have a repository
if (!$rep)
{
	renderTemplate404('log','NOREP');
}

$svnrep = new SVNRepository($rep);

$history = $svnrep->getLog($path, 'HEAD', '', false, 1, ($path == '/') ? '' : $peg);

if (!$history) 
{
	unset($vars['error']);
	$history = $svnrep->getLog($path, '', '', false, 1, ($path == '/') ? '' : $peg);

	if (!$history) 
	{
		renderTemplate404('log','NOPATH');
	}
}

$youngest = ($history && isset($history->entries[0])) ? $history->entries[0]->rev : 0;

if (empty($startrev)) 
{
	//$startrev = ($rev) ? $rev : 'HEAD';
	$startrev = $rev;
}
else if ($startrev != 'HEAD' && $startrev != 'BASE' && $startrev != 'PREV' && $startrev != 'COMMITTED') 
{
	$startrev = (int)$startrev;
}

if (empty($endrev)) 
{
	$endrev = 1;
}
else if ($endrev != 'HEAD' && $endrev != 'BASE' && $endrev != 'PREV' && $endrev != 'COMMITTED') 
{
	$endrev = (int)$endrev;
}

if (empty($rev)) 
{
	$rev = $youngest;
}

if (empty($startrev)) 
{
	$startrev = $rev;
}

// make sure path is prefixed by a /
$ppath = $path;

if ($path == '' || $path[0] != '/') 
{
	$ppath = '/'.$path;
}

$vars['action'] = $lang['LOG'];
$vars['rev'] = $rev;
$vars['peg'] = $peg;
$vars['path'] = escape($ppath);

if ($history && isset($history->entries[0])) 
{
	$vars['log'] = xml_entities($history->entries[0]->msg);
	$vars['date'] = $history->entries[0]->date;
	$vars['age'] = datetimeFormatDuration(time() - strtotime($history->entries[0]->date));
	$vars['author'] = $history->entries[0]->author;
}

if ($max === false) 
{
	$max = ($dosearch) ? 0 : 40;
}
else if ($max < 0) 
{
	$max = 40;
}

// TODO: If the rev is less than the head, get the path (may have been renamed!)
// Will probably need to call `svn info`, parse XML output, and substring a path

createPathLinks($rep, $ppath, $passrev, $peg);
$passRevString = createRevAndPegString($rev, $peg);
$isDirString = ($isDir) ? 'isdir=1&amp;' : '';

unset($queryParams['repname']);
unset($queryParams['path']);

// Toggle 'showchanges' param for link to switch from the current behavior
if ($showchanges == $rep->logsShowChanges())
{
	$queryParams['showchanges'] = (int)!$showchanges;
}
else
{
	unset($queryParams['showchanges']);
}

$vars['changesurl'] = $config->getURL($rep, $path, 'log').buildQuery($queryParams);
$vars['changeslink'] = '<a href="'.$vars['changesurl'].'">'.$lang[($showchanges ? 'HIDECHANGED' : 'SHOWCHANGED')].'</a>';
$vars['showchanges'] = $showchanges;

// Revert 'showchanges' param to propagate the current behavior
if ($showchanges == $rep->logsShowChanges())
{
	unset($queryParams['showchanges']);
}
else
{
	$queryParams['showchanges'] = (int)$showchanges;
}

$vars['revurl'] = $config->getURL($rep, $path, 'revision').$isDirString.$passRevString;

if ($isDir) 
{
	$vars['directoryurl'] = $config->getURL($rep, $path, 'dir').$passRevString.'#'.anchorForPath($path);
	$vars['directorylink'] = '<a href="'.$vars['directoryurl'].'">'.$lang['LISTING'].'</a>';
}
else 
{
	$vars['filedetailurl'] = $config->getURL($rep, $path, 'file').$passRevString;
	$vars['filedetaillink'] = '<a href="'.$vars['filedetailurl'].'">'.$lang['FILEDETAIL'].'</a>';

	$vars['blameurl'] = $config->getURL($rep, $path, 'blame').$passRevString;
	$vars['blamelink'] = '<a href="'.$vars['blameurl'].'">'.$lang['BLAME'].'</a>';

	$vars['diffurl'] = $config->getURL($rep, $path, 'diff').$passRevString;
	$vars['difflink'] = '<a href="'.$vars['diffurl'].'">'.$lang['DIFFPREV'].'</a>';
}

if ($rep->isRssEnabled()) 
{
	$vars['rssurl'] = $config->getURL($rep, $path, 'rss').$isDirString.createRevAndPegString('', $peg);
	$vars['rsslink'] = '<a href="'.$vars['rssurl'].'">'.$lang['RSSFEED'].'</a>';
}

if ($rev != $youngest) 
{
	if ($path == '/') 
	{
		$vars['goyoungesturl'] = $config->getURL($rep, '', 'log').$isDirString;
	}
	else 
	{
		$vars['goyoungesturl'] = $config->getURL($rep, $path, 'log').$isDirString.'peg='.($peg ? $peg : $rev);
	}

	$vars['goyoungestlink'] = '<a href="'.$vars['goyoungesturl'].'"'.($youngest ? ' title="'.$lang['REV'].' '.$youngest.'"' : '').'>'.$lang['GOYOUNGEST'].'</a>';
}

// We get the bugtraq variable just once based on the HEAD
$bugtraq = new Bugtraq($rep, $svnrep, $ppath);

$vars['logsearch_moreresultslink'] = '';
$vars['pagelinks'] = '';
$vars['showalllink'] = '';

if ($history) 
{
	$history = $svnrep->getLog($path, $startrev, $endrev, true, $max, $peg);

	if (empty($history)) 
	{
		unset($vars['error']);
		$vars['warning'] = 'Revision '.$startrev.' of this resource does not exist.';
	}
}

if (!empty($history)) 
{
	// Get the number of separate revisions
	$revisions = count($history->entries);

	if ($all) 
	{
		$firstrevindex = 0;
		$lastrevindex = $revisions - 1;
		$pages = 1;
	}
	else 
	{
		// Calculate the number of pages
		$pages = floor($revisions / $maxperpage);
		if (($revisions % $maxperpage) > 0) $pages++;

		if ($page > $pages) $page = $pages;

		// Work out where to start and stop
		$firstrevindex = ($page - 1) * $maxperpage;
		$lastrevindex = min($firstrevindex + $maxperpage - 1, $revisions - 1);
	}

	$frev = isset($history->entries[0]) ? $history->entries[0]->rev : false;
	$brev = isset($history->entries[$firstrevindex]) ? $history->entries[$firstrevindex]->rev : false;
	$erev = isset($history->entries[$lastrevindex]) ? $history->entries[$lastrevindex]->rev : false;

	$entries = array();

	if ($brev && $erev) 
	{
		$history = $svnrep->getLog($path, $brev, $erev, false, 0, $peg, true);
		if ($history)
		{
			$entries = $history->entries;
		}
	}

	$row = 0;
	$index = 0;
	$found = false;

	foreach ($entries as $revision) 
	{
		// Assume a good match
		$match = true;
		$thisrev = $revision->rev;

		// Check the log for the search words, if searching
		if ($dosearch) 
		{
			if ((empty($fromRev) || $fromRev > $thisrev)) 
			{
				// Turn all the HTML entities into real characters.

				// Make sure that each word in the search in also in the log
				foreach ($words as $word) 
				{
					if (strpos(strtolower(removeAccents($revision->msg)), $word) === false && strpos(strtolower(removeAccents($revision->author)), $word) === false) 
					{
						$match = false;
						break;
					}
				}

				if ($match) 
				{
					$numSearchResults--;
					$found = true;
				}
			} 
			else 
			{
				$match = false;
			}
		}

		$thisRevString = createRevAndPegString($thisrev, ($peg ? $peg : $thisrev));

		if ($match) 
		{
			// Add the trailing slash if we need to (svnlook history doesn't return trailing slashes!)
			$rpath = $revision->path;

			if (empty($rpath)) 
			{
				$rpath = '/';
			}
			else if ($isDir && $rpath[strlen($rpath) - 1] != '/') 
			{
				$rpath .= '/';
			}

			$precisePath = $revision->precisePath;
			if (empty($precisePath)) 
			{
				$precisePath = '/';
			}
			else if ($isDir && $precisePath[strlen($precisePath) - 1] != '/') 
			{
				$precisePath .= '/';
			}

			// Find the parent path (or the whole path if it's already a directory)
			$pos = strrpos($rpath, '/');
			$parent = substr($rpath, 0, $pos + 1);

			$compareValue = (($isDir) ? $parent : $rpath).'@'.$thisrev;

			$listvar = &$listing[$index];
			$listvar['compare_box'] = '<input type="checkbox" name="compare[]" value="'.$compareValue.'" onclick="enforceOnlyTwoChecked(this)" />';
			$url = $config->getURL($rep, $rpath, 'revision').$thisRevString;
			$listvar['revlink'] = '<a href="'.$url.'">'.$thisrev.'</a>';

			$url = $config->getURL($rep, $precisePath, ($isDir ? 'dir' : 'file')).$thisRevString;

			$listvar['revpathlink'] = '<a href="'.$url.'">'.$precisePath.'</a>';
			$listvar['revpath'] = $precisePath;
			$listvar['revauthor'] = $revision->author;
			$listvar['revdate'] = $revision->date;
			$listvar['revage'] = $revision->age;
			$listvar['revlog'] = nl2br($bugtraq->replaceIDs(create_anchors(xml_entities($revision->msg))));
			$listvar['rowparity'] = $row;
			$listvar['compareurl'] = $config->getURL($rep, '', 'comp').'compare[]='.urlencode($rpath).'@'.($thisrev - 1).'&amp;compare[]='.urlencode($rpath).'@'.$thisrev;

			if ($showchanges) 
			{
				// Aggregate added/deleted/modified paths for display in table
				$modpaths = array();

				foreach ($revision->mods as $mod) 
				{
					$modpaths[$mod->action][] = $mod->path;
				}

				ksort($modpaths);

				foreach ($modpaths as $action => $paths) 
				{
					sort($paths);
					$modpaths[$action] = $paths;
				}

				$listvar['revadded'] = (isset($modpaths['A'])) ? implode('<br/>', escape($modpaths['A'])) : '';
				$listvar['revdeleted'] = (isset($modpaths['D'])) ? implode('<br/>', escape($modpaths['D'])) : '';
				$listvar['revmodified'] = (isset($modpaths['M'])) ? implode('<br/>', escape($modpaths['M'])) : '';
			}

			$row = 1 - $row;
			$index++;
		}

		// If we've reached the search limit, stop here...
		if (!$numSearchResults) 
		{
			$url = $config->getURL($rep, $path, 'log').$isDirString.$thisRevString;
			$vars['logsearch_moreresultslink'] = '<a href="'.$url.'&amp;search='.$search.'&amp;fr='.$thisrev.'">'.$lang['MORERESULTS'].'</a>';
			break;
		}
	}

	$vars['logsearch_resultsfound'] = true;

	if ($dosearch && !$found) 
	{
		if ($fromRev == 0) 
		{
			$vars['logsearch_nomatches'] = true;
			$vars['logsearch_resultsfound'] = false;
		} 
		else 
		{
			$vars['logsearch_nomorematches'] = true;
		}
	} 
	else if ($dosearch && $numSearchResults > 0) 
	{
		$vars['logsearch_nomorematches'] = true;
	}

	// Work out the paging options, create links to pages of results
	if ($pages > 1) 
	{
		$prev = $page - 1;
		$next = $page + 1;

		unset($queryParams['page']);
		$logurl = $config->getURL($rep, $path, 'log').buildQuery($queryParams);

		if ($page > 1) 
		{
			$vars['pagelinks'] .= '<a href="'.$logurl.(!$peg && $frev && $prev != 1 ? '&amp;peg='.$frev : '').'&amp;page='.$prev.'">&larr;'.$lang['PREV'].'</a>';
		}
		else 
		{
			$vars['pagelinks'] .= '<span>&larr;'.$lang['PREV'].'</span>';
		}

		for ($p = 1; $p <= $pages; $p++) 
		{
			if ($p != $page) 
			{
				$vars['pagelinks'] .= '<a href="'.$logurl.(!$peg && $frev && $p != 1 ? '&amp;peg='.$frev : '').'&amp;page='.$p.'">'.$p.'</a>';
			} 
			else 
			{
				$vars['pagelinks'] .= '<span id="curpage">'.$p.'</span>';
			}
		}

		if ($page < $pages) 
		{
			$vars['pagelinks'] .= '<a href="'.$logurl.(!$peg && $frev ? '&amp;peg='.$frev : '').'&amp;page='.$next.'">'.$lang['NEXT'].'&rarr;</a>';
		}
		else 
		{
			$vars['pagelinks'] .= '<span>'.$lang['NEXT'].'&rarr;</span>';
		}

		$vars['showalllink'] = '<a href="'.$logurl.'&amp;all=1">'.$lang['SHOWALL'].'</a>';
	}
}

// Create form elements for filtering and searching log messages
if ($config->multiViews) 
{
	$hidden = '<input type="hidden" name="op" value="log" />';
}
else 
{
	$hidden = '<input type="hidden" name="repname" value="'.$repname.'" />';
	$hidden .= '<input type="hidden" name="path" value="'.$path.'" />';
}

if ($isDir)
{
	$hidden .= '<input type="hidden" name="isdir" value="'.$isDir.'" />';
}

if ($peg)
{
	$hidden .= '<input type="hidden" name="peg" value="'.$peg.'" />';
}

if ($showchanges != $rep->logsShowChanges())
{
	$hidden .= '<input type="hidden" name="showchanges" value="'.$showchanges.'" />';
}

$vars['logsearch_form'] = '<form method="get" action="'.$config->getURL($rep, $path, 'log').'" id="search">'.$hidden;
$vars['logsearch_startbox'] = '<input name="sr" size="5" value="'.$startrev.'" />';
$vars['logsearch_endbox'] = '<input name="er" size="5" value="'.$endrev.'" />';
$vars['logsearch_maxbox'] = '<input name="max" size="5" value="'.($max == 0 ? 40 : $max).'" />';
$vars['logsearch_inputbox'] = '<input name="search" value="'.escape($search).'" />';
$vars['logsearch_showall'] = '<input type="checkbox" name="all" value="1"'.($all ? ' checked="checked"' : '').' />';
$vars['logsearch_submit'] = '<input type="submit" value="'.$lang['GO'].'" />';
$vars['logsearch_endform'] = '</form>';

// If a filter is in place, produce a link to clear all filter parameters
if ($page !== 1 || $all || $dosearch || $fromRev || $startrev !== $rev || $endrev !== 1 || $max !== 40) 
{
	$url = $config->getURL($rep, $path, 'log').$isDirString.$passRevString;
	$vars['logsearch_clearloglink'] = '<a href="'.$url.'">'.$lang['CLEARLOG'].'</a>';
}

// Create form elements for comparing selected revisions
$vars['compare_form'] = '<form method="get" action="'.$config->getURL($rep, '', 'comp').'" id="compare">';

if ($config->multiViews) 
{
	$vars['compare_form'] .= '<input type="hidden" name="op" value="comp" />';
}
else
{
	$vars['compare_form'] .= '<input type="hidden" name="repname" value="'.$repname.'" />';
}

$vars['compare_submit'] = '<input type="submit" value="'.$lang['COMPAREREVS'].'" />';
$vars['compare_endform'] = '</form>';

if (!$rep->hasReadAccess($path, false)) 
{
	$vars['error'] = $lang['NOACCESS'];
	sendHeaderForbidden();
}

renderTemplate('log');
