Scripts: create server script for pmtiles

scripts/server.ts

@@ -1,14 +1,22 @@
 import http from "node:http"
+import { ServerResponse } from "http"
+import { createReadStream } from "node:fs"
 
 export interface Handler {
     mustMatch: string | RegExp
     mimetype: string
     addHeaders?: Record<string, string>
+    /**
+     * IF set, do not write headers and result; only close.
+     * Use this if you want to send binary data
+     */
+    unmanaged?: boolean
     handle: (
         path: string,
         queryParams: URLSearchParams,
         req: http.IncomingMessage,
-        body: string | undefined
+        body: string | undefined,
+        res: http.ServerResponse
     ) => Promise<string>
 }
 
@@ -112,7 +120,11 @@ export class Server {
                 }
 
                 try {
-                    const result = await handler.handle(path, url.searchParams, req, body)
+                    const result = await handler.handle(path, url.searchParams, req, body, res)
+                    if(handler.unmanaged){
+                        res.end()
+                        return
+                    }
                     if (result === undefined) {
                         res.writeHead(500)
                         res.write("Could not fetch this website, probably blocked by them")
@@ -129,14 +141,18 @@ export class Server {
                             result
                         )
                     }
+
                     const extraHeaders = handler.addHeaders ?? {}
                     res.writeHead(200, { "Content-Type": handler.mimetype, ...extraHeaders })
                     res.write("" + result)
                     res.end()
+
+
                 } catch (e) {
                     console.error("Could not handle request:", e)
                     res.writeHead(500)
-                    res.write(e)
+                    res.write("Internal server error - something went wrong:")
+                    res.write(e.toString())
                     res.end()
                 }
             } catch (e) {
@@ -145,8 +161,19 @@ export class Server {
             }
         }).listen(port)
         console.log(
-            "Server is running on port " + port,
+            "Server is running on http://127.0.0.1:" + port,
             ". Supported endpoints are: " + handle.map((h) => h.mustMatch).join(", ")
         )
     }
+
+    /**
+     * Sends a file straight from disk.
+     * Assumes that headers have been set on res
+     * @param path
+     * @param res
+     */
+    public static sendFile(path: string, res: ServerResponse){
+        createReadStream(path).pipe(res);
+    }
+
 }