85 lines
2.5 KiB
PHP
85 lines
2.5 KiB
PHP
<?php
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/**
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* Map Tile PHP Proxy
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*
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* Examples of usage:
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* /tiles/{r}/{z}/{x}/{y}.png
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* /tiles.php?r={r}&z={z}&x={x}&y={y}&bbox={left,bottom,right,top}
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*
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* /tiles/osm/10/539/369.png
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* /tiles.php?r=osm&z=10&x=539&y=369&bbox=9.19791,44.55588,10.08314,45.13950
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*
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* @package tile-proxy-php
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* @author Raruto <raruto.github.io>
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* @link https://github.com/Raruto/tile-proxy-php
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* @license https://www.gnu.org/licenses/gpl-3.0.txt GNU/GPLv3
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*/
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// User configs.
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require_once 'config.php';
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// Tile functions.
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require_once 'functions.php';
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// Default configs.
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$user_agent = @$config['user_agent'] ?: 'Tile-Proxy-PHP/0.1';
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$servers = @$config['servers'] ?: array(
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'osm' => 'https://{switch:a,b,c}.tile.openstreetmap.org/{z}/{x}/{y}.png',
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'otm' => 'https://{switch:a,b,c}.tile.opentopomap.org/{z}/{x}/{y}.png',
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);
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$bbox = @$config['bbox'] ?: '-180,-90,180,90';
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$ttl = @$config['ttl'] ?: 86400;
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$headers = array_change_key_case(
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@$config['headers'] ?: array(
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'Access-Control-Allow-Origin:' => '*',
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), CASE_LOWER
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);
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$bbox = empty( $_GET['bbox'] ) ? $bbox : $_GET['bbox'];
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$z = intval( $_GET['z'] );
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$x = intval( $_GET['x'] );
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$y = intval( $_GET['y'] );
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$r = strip_tags( $_GET['r'] );
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// allow only servers wich are defined within the tiles-config.php.
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if ( ! isset( $servers[ $r ] ) ) {
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print_404_page();
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exit;
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}
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/* // proxy //////////////////////////////////////////////////////////// */
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$url = generate_tile_server_url( $servers[ $r ] );
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$folder = "${r}/${z}/${x}";
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$file = $folder . "/${y}.png";
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$bbox = explode( ',', $bbox );
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$bbox_left = $bbox[0];
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$bbox_bottom = $bbox[1];
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$bbox_right = $bbox[2];
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$bbox_top = $bbox[3];
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// useful parameters to detect which tiles are within the bbox area.
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$min_tile_x = lng_to_tile_x( $bbox_left, $z );
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$max_tile_x = lng_to_tile_x( $bbox_right, $z );
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$min_tile_y = lat_to_tile_y( $bbox_top, $z );
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$max_tile_y = lat_to_tile_y( $bbox_bottom, $z );
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$num_tiles_row = ( $max_tile_x - $min_tile_x ) + 1;
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$num_tiles_col = ( $max_tile_y - $min_tile_y ) + 1;
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$num_tiles_bbox = $num_tiles_row * $num_tiles_col;
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// if (x, y, z) out bbox range: we don't cache it on this server.
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if ( ! in_range( $x, $min_tile_x, $max_tile_x ) || ! in_range( $y, $min_tile_y, $max_tile_y ) ) {
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proxy_remote_file( $url );
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exit;
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}
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// if (x, y, z) in bbox range: we cache it on this server.
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if ( ! is_file( $file ) || ( is_file_expired( $file ) && remote_file_exists( $url ) ) ) {
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download_remote_file( $url, $folder, $file );
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}
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// Send to browser any previously cached tile.
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output_local_file( $file );
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exit;
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