about summary refs log tree commit diff stats
path: root/src/index.ts
blob: ff154faa377491ee227a65dbd9e0b19e8c15e896 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
import path from "node:path";
import fs, { Stats } from "node:fs";
import type { BunFile, Serve } from "bun";

import readConfig from "./config";

const base = "../website/";
const publicDir = path.resolve(base, "public") + path.sep;

const config = readConfig(base);
const defaultHeaders = {
  ...config.extra.headers,
  vary: "Accept-Encoding",
};

type File = {
  filename: string;
  handle: BunFile;
  relPath: string;
  headers?: Record<string, string>;
  size: number;
  mtime: Date;
};

let files = new Map<string, File>();

function registerFile(
  path: string,
  pathname: string,
  filename: string,
  stat: Stats,
): void {
  pathname = "/" + (pathname === "." || pathname === "./" ? "" : pathname);

  if (files.get(pathname) !== undefined) {
    console.warn("File already registered:", pathname);
  }
  files.set(pathname, {
    filename,
    relPath: "/" + path,
    handle: Bun.file(filename),
    headers:
      pathname === "/404.html"
        ? Object.assign({}, defaultHeaders, { "cache-control": "no-cache" })
        : undefined,
    size: stat.size,
    mtime: stat.mtime,
  });
}

function walkDirectory(root: string, dir: string) {
  const absDir = path.join(root, dir);
  for (let pathname of fs.readdirSync(absDir)) {
    const relPath = path.join(dir, pathname);
    const absPath = path.join(absDir, pathname);
    const stat = fs.statSync(absPath);
    if (stat.isDirectory()) {
      walkDirectory(root, relPath + path.sep);
    } else if (stat.isFile()) {
      if (pathname.startsWith("index.html")) {
        const dir = relPath.replace("index.html", "");
        registerFile(relPath, dir, absPath, stat);
        if (dir !== ".") {
          registerFile(relPath, dir + path.sep, absPath, stat);
        }
      }
      registerFile(relPath, relPath, absPath, stat);
    }
  }
}

walkDirectory(publicDir, "");

async function serveFile(
  file: File | undefined,
  statusCode: number = 200,
  extraHeaders: Record<string, string> = {},
): Promise<Response> {
  if (file && (await file.handle.exists())) {
    return new Response(file.handle, {
      headers: {
        "last-modified": file.mtime.toUTCString(),
        ...extraHeaders,
        ...(file.headers || defaultHeaders),
      },
      status: statusCode,
    });
  } else {
    // TODO return encoded
    return serveFile(files.get("/404.html"), 404);
  }
}

async function serveEncodedFile(
  file: File | undefined,
  statusCode: number = 200,
  extraHeaders: Record<string, string> = {},
): Promise<Response> {
  const res = await serveFile(file, statusCode, extraHeaders);
  res.headers.delete("content-disposition");
  return res;
}

function parseIfModifiedSinceHeader(header: string | null): number {
  return header ? new Date(header).getTime() + 999 : 0;
}

export default {
  fetch: async function (request) {
    const pathname = new URL(request.url).pathname;
    const file = files.get(pathname);
    if (file) {
      if (
        parseIfModifiedSinceHeader(request.headers.get("if-modified-since")) >=
        file?.mtime.getTime()
      ) {
        return new Response("", { status: 304, headers: defaultHeaders });
      }
      const encodings = (request.headers.get("accept-encoding") || "")
        .split(",")
        .map((x) => x.trim().toLowerCase());
      if (encodings.includes("br") && files.has(file.relPath + ".br")) {
        return serveEncodedFile(files.get(file.relPath + ".br"), 200, {
          "content-encoding": "br",
          "content-type": file.handle.type,
        });
      } else if (
        encodings.includes("zstd") &&
        files.has(file.relPath + ".zst")
      ) {
        return serveEncodedFile(files.get(file.relPath + ".zst"), 200, {
          "content-encoding": "zstd",
          "content-type": file.handle.type,
        });
      } else if (
        encodings.includes("gzip") &&
        files.has(file.relPath + ".gz")
      ) {
        return serveEncodedFile(files.get(file.relPath + ".gz"), 200, {
          "content-encoding": "gzip",
          "content-type": file.handle.type,
        });
      }
    }
    return serveFile(file);
  },
} satisfies Serve;