Add php-script which can be used to serve maps from an sql-server using an external webserver

public/_index.php

@@ -0,0 +1,152 @@
+<?php
+
+// !!! SET YOUR SQL-CONNECTION SETTINGS HERE: !!!
+
+$hostname = "127.0.0.1";
+$port     = 3306;
+$username = "root";
+$password = "";
+$database = "bluemap";
+
+// set this to "none" if you disabled compression on your maps
+$hiresCompression = "gzip"; 
+
+// !!! END - DONT CHANGE ANYTHING AFTER THIS LINE !!!
+
+
+
+
+
+// some helper functions
+function error($code, $message = null) {
+    global $path;
+
+    http_response_code($code);
+    header("Content-Type: text/plain");
+    echo "BlueMap php-script - $code\n";
+    if ($message != null) echo $message."\n";
+    echo "Requested Path: $path";
+    exit;
+}
+
+function startsWith($haystack, $needle) {
+    return substr($haystack, 0, strlen($needle)) === $needle;
+}
+
+
+// determine relative request-path
+$root = dirname($_SERVER['PHP_SELF']);
+$uriPath = $_SERVER['REQUEST_URI'];
+$path = substr($uriPath, strlen($root));
+
+// add / 
+if ($path === "") {
+    header("Location: $uriPath/");
+    exit;
+}
+
+// root => index.html
+if ($path === "/") {
+    header("Content-Type: text/html");
+    echo file_get_contents("index.html");
+    exit;
+}
+
+if (startsWith($path, "/maps/")) {
+
+    // determine map-path
+    $pathParts = explode("/", substr($path, strlen("/maps/")), 2);
+    $mapId = $pathParts[0];
+    $mapPath = $pathParts[1];
+
+    // get sql-connection
+    $sql = new mysqli($hostname, $username, $password, $database, $port);
+    if ($sql->errno) error(500, "Failed to connect to Database!");
+
+    // meta-files
+    $metaFiles = [
+        "textures.json" => "textures",
+        "settings.json" => "settings",
+        "live/markers" => "markers",
+        "live/players" => "players"
+    ];
+
+    // provide meta-files
+    foreach ($metaFiles as $metaFilePath => $metaKey) {
+        if (startsWith($mapPath, $metaFilePath)) {
+            $statement = $sql->prepare("
+                SELECT t.`value` 
+                FROM `bluemap_map_meta` t
+                 INNER JOIN `bluemap_map` m
+                  ON t.`map` = m.`id`
+                WHERE m.`map_id` = ?
+                AND t.`key` = ?
+            ");
+            $statement->bind_param("ss", $mapId, $metaKey);
+            $statement->execute();
+            if ($statement->errno) error(500, "Database query failed!");
+
+            $result = $statement->get_result();
+            if ($result && $line = $result->fetch_assoc()) {
+                header("Content-Type: application/json");
+                echo $line["value"];
+                exit;
+            }
+        }
+    }
+
+    // provide map-tiles
+    if (startsWith($mapPath, "tiles/")) {
+
+        // parse tile-coordinates
+        preg_match_all("/tiles\/([\d\/]+)\/x(-?[\d\/]+)z(-?[\d\/]+).*/", $mapPath, $matches);
+        $lod = intval($matches[1][0]);
+        $tileX = intval(str_replace("/", "", $matches[2][0]));
+        $tileZ = intval(str_replace("/", "", $matches[3][0]));
+        $compression = $lod === 0 ? $hiresCompression : "none";
+
+        // query for tile
+        $statement = $sql->prepare("
+            SELECT t.`data`
+            FROM `bluemap_map_tile` t
+             INNER JOIN `bluemap_map` m
+              ON t.`map` = m.`id`
+             INNER JOIN `bluemap_map_tile_compression` c
+              ON t.`compression` = c.`id`
+            WHERE m.`map_id` = ?
+            AND t.`lod` = ?
+            AND t.`x` = ?
+            AND t.`z` = ?
+            AND c.`compression` = ?
+        ");
+        $statement->bind_param("siiis", $mapId, $lod, $tileX, $tileZ, $compression);
+        $statement->execute();
+        if ($statement->errno) error(500, "Database query failed!");
+
+        // return result
+        $result = $statement->get_result();
+        if ($result && $line = $result->fetch_assoc()) {
+            if ($compression !== "none")
+                header("Content-Encoding: $compression");
+
+            if ($lod === 0) {
+                header("Content-Type: application/json");
+            } else {
+                header("Content-Type: image/png");
+            }
+
+            echo $line["data"];
+            exit;
+        }
+
+    }
+
+    // empty json response if nothing found
+    header("Content-Type: application/json");
+    echo "{}";
+    exit;
+
+}
+
+// no match => 404
+error(404);