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tile.php
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tile.php
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<?php
header('Access-Control-Allow-Origin: *');
if( isset($_GET['tileset']) && preg_match('/^[\w\d_-]+$/', $_GET['tileset']) ) {
$tileset = $_GET['tileset'];
$flip = true;
if( strlen($tileset) > 4 && substr($tileset,strlen($tileset)-4) == '-tms' ) {
$tileset = substr($tileset,0,strlen($tileset)-4);
$flip = false;
}
try {
$db = new PDO('sqlite:'.$tileset.'.mbtiles','','',array(PDO::ATTR_PERSISTENT => true));
if( !isset($db) ) {
header('Content-type: text/plain');
print 'Incorrect tileset name: '.$_GET['tileset'];
exit;
}
// http://c.tile.openstreetmap.org/12/2392/1190.png
$z = floatval($_GET['z']);
$y = floatval($_GET['y']);
$x = floatval($_GET['x']);
if( $flip ) {
$y = pow(2, $z) - 1 - $y;
}
$result = $db->query('select tile_data as t from tiles where zoom_level='.$z.' and tile_column='.$x.' and tile_row='.$y);
$data = $result->fetchColumn();
if( !isset($data) || $data === FALSE ) {
$png = imagecreatetruecolor(256, 256);
imagesavealpha($png, true);
$trans_colour = imagecolorallocatealpha($png, 0, 0, 0, 127);
imagefill($png, 0, 0, $trans_colour);
header('Content-type: image/png');
imagepng($png);
//header($_SERVER['SERVER_PROTOCOL'].' 404 Not Found');
} else {
$result = $db->query('select value from metadata where name="format"');
$resultdata = $result->fetchColumn();
$format = isset($resultdata) && $resultdata !== FALSE ? $resultdata : 'png';
if( $format == 'jpg' )
$format = 'jpeg';
header('Content-type: image/'.$format);
print $data;
}
} catch( PDOException $e ) {
header('Content-type: text/plain');
print 'Error querying the database: '.$e->getMessage();
}
} elseif( isset($_GET['tmsinfo']) ) {
// get tms xml
header('Content-type: text/xml');
print '<?xml version="1.0" encoding="UTF-8" ?>';
$basetms = getbaseurl();
if( $_GET['tmsinfo'] == 'root' ) {
?>
<Services>
<TileMapService title="MBTiles PHP TMS" version="1.0.0" href="http://<?=$basetms ?>1.0.0/" />
</Services>
<?php
} elseif( $_GET['tmsinfo'] == 'service' ) {
?>
<TileMapService version="1.0.0" services="<?=$basetms ?>">
<Title>MBTiles PHP TMS</Title>
<Abstract />
<TileMaps>
<?php if( $handle = opendir('.') ) {
while( ($file = readdir($handle)) !== false ) {
if( preg_match('/^[\w\d_-]+\.mbtiles$/', $file) && is_file($file) ) {
try {
$db = new PDO('sqlite:'.$file);
$params = readparams($db);
?> <TileMap title="<?=htmlspecialchars($params['name']) ?>" srs="OSGEO:41001" profile="global-mercator" href="<?=$basetms.'1.0.0/'.str_replace('.mbtiles','',$file) ?>" />
<?php } catch( PDOException $e ) {}
}
}
}
?>
</TileMaps>
</TileMapService>
<?php
} elseif( $_GET['tmsinfo'] == 'resource' && isset($_GET['tmslayer']) && preg_match('/^[\w\d_-]+$/', $_GET['tmslayer']) ) {
$layer = $_GET['tmslayer'];
try{
$db = new PDO('sqlite:'.$layer.'.mbtiles');
$params = readparams($db);
$bounds = isset($params['bounds']) ? explode(',',$params['bounds']) : array(-180,-90,180,90);
$center = isset($params['center']) ? explode(',',$params['center']) : array(0,0,0);
?>
<TileMap version="1.0.0" tilemapservice="<?=$basetms ?>1.0.0/">
<Title><?=htmlspecialchars($params['name']) ?></Title>
<Abstract><?=htmlspecialchars($params['description']) ?></Abstract>
<SRS>OSGEO:41001</SRS>
<BoundingBox minx="<?=$bounds[0] ?>" miny="<?=$bounds[1] ?>" maxx="<?=$bounds[2] ?>" maxy="<?=$bounds[3] ?>" />
<Origin x="<?=$center[0] ?>" y="<?=$center[1] ?>"/>
<TileFormat width="256" height="256" mime-type="image/<?=$params['format'] == 'jpg' ? 'jpeg' : 'png' ?>" extension="<?=$params['format']?>"/>
<TileSets profile="global-mercator">
<?php foreach( readzooms($db) as $zoom ) { ?>
<TileSet href="<?=$basetms.'1.0.0/'.$layer.'/'.$zoom ?>" units-per-pixel="<?=78271.516 / pow(2, $zoom) ?>" order="<?=$zoom ?>" />
<?php } ?>
</TileSets>
</TileMap>
<?php
} catch( PDOException $e ) {}
}
} else {
// show list of all tilesets along with links
print '<h2>MBTiles PHP proxy</h2>';
if( $handle = opendir('.') ) {
$found = false;
while( ($file = readdir($handle)) !== false ) {
if( preg_match('/^[\w\d_-]+\.mbtiles$/', $file) && is_file($file) ) {
try {
$db = new PDO('sqlite:'.$file);
$params = readparams($db);
$zooms = readzooms($db);
$db = null;
print '<h3>'.htmlspecialchars($params['name']).'</h3>';
if( isset($params['description']) )
print '<p>'.htmlspecialchars($params['description']).'</p>';
print '<p>Type: '.$params['type'].', format: '.$params['format'].', version: '.$params['version'].'</p>';
if( isset($params['bounds']) )
print '<p>Bounds: '.str_replace(',', ', ',$params['bounds']).'</p>';
if( isset($params['center']) )
print '<p>Center: '.str_replace(',', ', ',$params['center']).'</p>';
print '<p>Zoom levels: '.implode(', ', $zooms).'</p>';
print '<p>OpenLayers: <tt>new OpenLayers.Layer.OSM("'.htmlspecialchars($params['name']).'", "'.getbaseurl().preg_replace('/\.mbtiles/','',$file).'/${z}/${x}/${y}", {numZoomLevels: '.(end($zooms)+1).', isBaseLayer: '.($params['type']=='baselayer'?'true':'false').'});</tt></p>';
print '<p>TMS: <tt>http://'.$_SERVER['HTTP_HOST'].preg_replace('/\/[^\/]+$/','/',$_SERVER['REQUEST_URI']).'1.0.0/'.preg_replace('/\.mbtiles/','',$file).'</tt></p>';
} catch( PDOException $e ) {}
}
}
} else {
print 'Error opening script directory.';
}
}
function getbaseurl() {
return 'http://'.$_SERVER['HTTP_HOST'].preg_replace('/\/(1.0.0\/)?[^\/]*$/','/',$_SERVER['REQUEST_URI']);
}
function readparams( $db ) {
$params = array();
$result = $db->query('select name, value from metadata');
while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
$params[$row['name']] = $row['value'];
}
return $params;
}
function readzooms( $db ) {
$zooms = array();
$result = $db->query('select zoom_level from tiles group by zoom_level order by zoom_level');
while ($zoom = $result->fetchColumn()) {
$zooms[] = $zoom;
}
return $zooms;
}