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// This file is part of Laurali <https://github.com/gemrest/laurali>.
// Copyright (C) 2022-2022 Fuwn <[email protected]>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2022 Fuwn <[email protected]>
// SPDX-License-Identifier: GPL-3.0-only
import { ServerConfiguration } from "./configuration.ts";
import { Hook } from "./hooks.ts";
/** The base Laurali server to be extended upon */
export abstract class Server {
/**
* The internal `Deno.TlsListener` which listens for and accepts client
* connections.
*/
#listener: Deno.TlsListener;
/** All registered route functions of the `Server` */
// deno-lint-ignore no-explicit-any
static #routes: Map<string, (ctx: Deno.TlsConn) => any> = new Map();
/** All registered hook functions of the `Server` */
static #hooks: Map<Hook, (ctx: Deno.TlsConn) => void> = new Map();
/** The port of the `Server` */
static #port: number;
/** The hostname of the `Server` */
static #hostname: string;
/**
* @param certFile The path to the public key file of the `Server`
* @param keyFile The path to the private key file of the `Server`
* @param config Extra configuration options of the `Server`
*/
constructor(
certFile: string,
keyFile: string,
config?: ServerConfiguration,
) {
const port = config?.port || 1965;
const hostname = config?.hostname || "0.0.0.0";
Server.#port = port;
Server.#hostname = hostname;
this.#listener = Deno.listenTls({
port,
hostname,
certFile,
keyFile,
});
if (config?.proxy?.enable) {
if (config.proxy.baseURL === undefined) {
throw new Error("ProxyConfiguration is missing proxy baseURL");
}
this.#proxy(config.proxy.baseURL, config.proxy.hostname || hostname);
}
}
async #proxy(baseURL: string, host: string) {
const server = Deno.listen({ port: 8080 });
for await (const c of server) {
for await (const r of Deno.serveHttp(c)) {
r.respondWith(Response.redirect(baseURL + host));
}
}
}
/** Add a route function to the `Server` */
// deno-lint-ignore no-explicit-any
addRoute(route: string, handler: () => any) {
Server.#routes.set(route, handler);
}
/** Add a hook function to the `Server` */
addHook(hook: Hook, handler: () => void) {
Server.#hooks.set(hook, handler);
}
/** Get the `port` of the `Server` */
static get port() {
return Server.#port;
}
/** Get the `hostname` of the `Server` */
static get hostname() {
return Server.#hostname;
}
/** Called before a connection to a client has been responded to */
protected onPreRoute?(ctx?: Deno.TlsConn): void;
/** Called after a connection to a client has concluded */
protected onPostRoute?(ctx?: Deno.TlsConn): void;
/** Called before the `Server` starts listening for connections */
protected onListen?(): void;
/**
* The response delivered to a client when the `Server` experiences any error
* while evaluating the result of a route function, or if the `Server` cannot
* find a route function for a given path.
*/
protected onError?(): void;
/** Start listening and responding to client connections */
async listen() {
// If the `Server` has an `onListen` hook, call it.
if (this.onListen) this.onListen();
// Listen for connections and handle them.
for await (const r of this.#listener) {
const b = new Uint8Array(1026);
let n;
try {
n = await r.read(b);
} catch (error) {
console.log(error);
r.close();
continue;
}
const onPreRoute = Server.#hooks.get(Hook.ON_PRE_ROUTE);
const onPostRoute = Server.#hooks.get(Hook.ON_POST_ROUTE);
const onError = Server.#hooks.get(Hook.ON_ERROR);
// Make sure that the client has sent a request.
if (n === null) {
console.log("could not read from client");
r.close();
continue;
}
const path = String.fromCharCode(...b.subarray(0, n)).replace(
/\r\n$/,
"",
).replace(/gemini:\/\//, "");
// If the `Server` has an `onPreRoute` hook, call it.
if (onPreRoute) onPreRoute(r);
// Respond to index requests.
if (path.endsWith("/") || path.endsWith("localhost")) {
const route = Server.#routes.get("/");
let response;
if (route === undefined) {
if (onError) {
response = onError(r);
} else {
response = "The server (Laurali) could not find that route.";
}
} else {
response = route(r);
}
await r.write(
(new TextEncoder()).encode(
`20 text/gemini\r\n${response}`,
),
);
r.close();
} else { // Respond to another other request.
const route = Server.#routes.get(path.replace("localhost", ""));
let response;
if (route === undefined) {
if (onError) {
response = onError(r);
} else {
response = "The server (Laurali) could not find that route.";
}
} else {
response = route(r);
}
await r.write(
(new TextEncoder()).encode(
`20 text/gemini\r\n${response}`,
),
);
r.close();
}
// If the `Server` has an `onPostRoute` hook, call it.
if (onPostRoute) onPostRoute(r);
continue;
}
}
}
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