Started to implement server

vendor/deno.land/std@0.178.0/encoding/base64.ts

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+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+/**
+ * {@linkcode encode} and {@linkcode decode} for
+ * [base64](https://en.wikipedia.org/wiki/Base64) encoding.
+ *
+ * This module is browser compatible.
+ *
+ * @example
+ * ```ts
+ * import {
+ *   decode,
+ *   encode,
+ * } from "https://deno.land/std@$STD_VERSION/encoding/base64.ts";
+ *
+ * const b64Repr = "Zm9vYg==";
+ *
+ * const binaryData = decode(b64Repr);
+ * console.log(binaryData);
+ * // => Uint8Array [ 102, 111, 111, 98 ]
+ *
+ * console.log(encode(binaryData));
+ * // => Zm9vYg==
+ * ```
+ *
+ * @module
+ */
+
+const base64abc = [
+  "A",
+  "B",
+  "C",
+  "D",
+  "E",
+  "F",
+  "G",
+  "H",
+  "I",
+  "J",
+  "K",
+  "L",
+  "M",
+  "N",
+  "O",
+  "P",
+  "Q",
+  "R",
+  "S",
+  "T",
+  "U",
+  "V",
+  "W",
+  "X",
+  "Y",
+  "Z",
+  "a",
+  "b",
+  "c",
+  "d",
+  "e",
+  "f",
+  "g",
+  "h",
+  "i",
+  "j",
+  "k",
+  "l",
+  "m",
+  "n",
+  "o",
+  "p",
+  "q",
+  "r",
+  "s",
+  "t",
+  "u",
+  "v",
+  "w",
+  "x",
+  "y",
+  "z",
+  "0",
+  "1",
+  "2",
+  "3",
+  "4",
+  "5",
+  "6",
+  "7",
+  "8",
+  "9",
+  "+",
+  "/",
+];
+
+/**
+ * CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727
+ * Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation
+ * @param data
+ */
+export function encode(data: ArrayBuffer | string): string {
+  const uint8 = typeof data === "string"
+    ? new TextEncoder().encode(data)
+    : data instanceof Uint8Array
+    ? data
+    : new Uint8Array(data);
+  let result = "",
+    i;
+  const l = uint8.length;
+  for (i = 2; i < l; i += 3) {
+    result += base64abc[uint8[i - 2] >> 2];
+    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
+    result += base64abc[((uint8[i - 1] & 0x0f) << 2) | (uint8[i] >> 6)];
+    result += base64abc[uint8[i] & 0x3f];
+  }
+  if (i === l + 1) {
+    // 1 octet yet to write
+    result += base64abc[uint8[i - 2] >> 2];
+    result += base64abc[(uint8[i - 2] & 0x03) << 4];
+    result += "==";
+  }
+  if (i === l) {
+    // 2 octets yet to write
+    result += base64abc[uint8[i - 2] >> 2];
+    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
+    result += base64abc[(uint8[i - 1] & 0x0f) << 2];
+    result += "=";
+  }
+  return result;
+}
+
+/**
+ * Decodes a given RFC4648 base64 encoded string
+ * @param b64
+ */
+export function decode(b64: string): Uint8Array {
+  const binString = atob(b64);
+  const size = binString.length;
+  const bytes = new Uint8Array(size);
+  for (let i = 0; i < size; i++) {
+    bytes[i] = binString.charCodeAt(i);
+  }
+  return bytes;
+}

vendor/deno.land/std@0.178.0/encoding/base64url.ts

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+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+/**
+ * {@linkcode encode} and {@linkcode decode} for
+ * [base64 URL safe](https://en.wikipedia.org/wiki/Base64#URL_applications) encoding.
+ *
+ * This module is browser compatible.
+ *
+ * @example
+ * ```ts
+ * import {
+ *   decode,
+ *   encode,
+ * } from "https://deno.land/std@$STD_VERSION/encoding/base64url.ts";
+ *
+ * const binary = new TextEncoder().encode("foobar");
+ * const encoded = encode(binary);
+ * console.log(encoded);
+ * // => "Zm9vYmFy"
+ *
+ * console.log(decode(encoded));
+ * // => Uint8Array(6) [ 102, 111, 111, 98, 97, 114 ]
+ * ```
+ *
+ * @module
+ */
+
+import * as base64 from "./base64.ts";
+
+/*
+ * Some variants allow or require omitting the padding '=' signs:
+ * https://en.wikipedia.org/wiki/Base64#The_URL_applications
+ * @param base64url
+ */
+function addPaddingToBase64url(base64url: string): string {
+  if (base64url.length % 4 === 2) return base64url + "==";
+  if (base64url.length % 4 === 3) return base64url + "=";
+  if (base64url.length % 4 === 1) {
+    throw new TypeError("Illegal base64url string!");
+  }
+  return base64url;
+}
+
+function convertBase64urlToBase64(b64url: string): string {
+  if (!/^[-_A-Z0-9]*?={0,2}$/i.test(b64url)) {
+    // Contains characters not part of base64url spec.
+    throw new TypeError("Failed to decode base64url: invalid character");
+  }
+  return addPaddingToBase64url(b64url).replace(/\-/g, "+").replace(/_/g, "/");
+}
+
+function convertBase64ToBase64url(b64: string): string {
+  return b64.replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");
+}
+
+/**
+ * Encodes a given ArrayBuffer or string into a base64url representation
+ * @param data
+ */
+export function encode(data: ArrayBuffer | string): string {
+  return convertBase64ToBase64url(base64.encode(data));
+}
+
+/**
+ * Converts given base64url encoded data back to original
+ * @param b64url
+ */
+export function decode(b64url: string): Uint8Array {
+  return base64.decode(convertBase64urlToBase64(b64url));
+}