<?php
	/**
	 * Does an export of a database or a table (via pg_dump)
	 * to the screen or as a download.
	 *
	 * $Id: dbexport.php,v 1.22 2007/03/25 03:15:09 xzilla Exp $
	 */

	// Prevent timeouts on large exports (non-safe mode only)
	if (!ini_get('safe_mode')) set_time_limit(0);

	// Include application functions
	$_no_output = true;
	include_once('./libraries/lib.inc.php');

	// Check that database dumps are enabled.
	if ($misc->isDumpEnabled()) {

		// Make it do a download, if necessary
		switch($_REQUEST['output']){
			case 'show':
				header('Content-Type: text/plain');
				break;
			case 'download':
				// Set headers.  MSIE is totally broken for SSL downloading, so
				// we need to have it download in-place as plain text
				if (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE') && isset($_SERVER['HTTPS'])) {
					header('Content-Type: text/plain');
				}
				else {
					header('Content-Type: application/download');
					header('Content-Disposition: attachment; filename=dump.sql');
				}
				break;
			case 'gzipped':
				// MSIE in SSL mode cannot do this - it should never get to this point
				header('Content-Type: application/download');
				header('Content-Disposition: attachment; filename=dump.sql.gz');
				break;
		}

		// Set environmental variables that pg_dump uses
		$server_info = $misc->getServerInfo();		
		putenv('PGPASSWORD=' . $server_info['password']);
		putenv('PGUSER=' . $server_info['username']);
		$hostname = $server_info['host'];
		if ($hostname !== null && $hostname != '') {
			putenv('PGHOST=' . $hostname);
		}
		$port = $server_info['port'];
		if ($port !== null && $port != '') {
			putenv('PGPORT=' . $port);
		}

		// Are we doing a cluster-wide dump or just a per-database dump
		$dumpall = ($_REQUEST['subject'] == 'server');
		
		// Get the path og the pg_dump/pg_dumpall executable
		$exe = $misc->escapeShellCmd($server_info[$dumpall ? 'pg_dumpall_path' : 'pg_dump_path']);
		
		// Build command for executing pg_dump.  '-i' means ignore version differences.
		$cmd = $exe . " -i";
		
		
		// Check for a specified table/view
		switch ($_REQUEST['subject']) {
		case 'table':
		case 'view':
			// Obtain the pg_dump version number
			$version = array();
			preg_match("/(\d+(?:\.\d+)?)(?:\.\d+)?.*$/", exec($exe . " --version"), $version);

			// Starting in 8.2, -n and -t are orthagonal, so we now schema qualify
			// the table name in the -t argument and quote both identifiers
			if ( ((float) $version[1]) >= 8.2 ) {
				$cmd .= " -t " . $misc->escapeShellArg('"'. $_REQUEST['schema'] . '"') . "." . $misc->escapeShellArg('"' .$_REQUEST[$_REQUEST['subject']] .'"');
            }
			elseif (((float) $version[1]) >= 7.4) {
			// If we are 7.4 or higher, assume they are using 7.4 pg_dump and
			// set dump schema as well.  Also, mixed case dumping has been fixed
			// then..
				$cmd .= " -t " . $misc->escapeShellArg($_REQUEST[$_REQUEST['subject']]);
				// Even though they're using a schema-enabled pg_dump, the backend database
				// may not support schemas.
				if ($data->hasSchemas()) {
					$cmd .= " -n " . $misc->escapeShellArg($_REQUEST['schema']);
				}
			}
			else {
				// This is an annoying hack needed to work around a bug in dumping
				// mixed case tables in pg_dump prior to 7.4
				$cmd .= " -t " . $misc->escapeShellArg('"' . $_REQUEST[$_REQUEST['subject']] . '"');
			}
		}

		// Check for GZIP compression specified
		if ($_REQUEST['output'] == 'gzipped' && !$dumpall) {
			$cmd .= " -Z 9";
		}
				
		switch ($_REQUEST['what']) {
			case 'dataonly':
				$cmd .= ' -a';
				if ($_REQUEST['d_format'] == 'sql') $cmd .= ' -d';
				elseif (isset($_REQUEST['d_oids'])) $cmd .= ' -o';
				break;
			case 'structureonly':
				$cmd .= ' -s';
				if (isset($_REQUEST['s_clean'])) $cmd .= ' -c';
				break;
			case 'structureanddata':
				if ($_REQUEST['sd_format'] == 'sql') $cmd .= ' -d';
				elseif (isset($_REQUEST['sd_oids'])) $cmd .= ' -o';
				if (isset($_REQUEST['sd_clean'])) $cmd .= ' -c';
				break;
		}

		if (!$dumpall) {
			putenv('PGDATABASE=' . $_REQUEST['database']);
		}
		
		// Execute command and return the output to the screen
		passthru($cmd);
	}

?>
