Simple Utility for Deno

A handy utility collection.

Example

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BASE64 Binary

const file = await Deno.readFile("/path/to/binary.bin");

const encoded = base64Encode(file); // base64 code.
const decoded = base64Decode(encoded); // Restored.

Easy WebCrypto

const file = await Deno.readFile("/path/to/binary.bin");

const uuid = cryptoUuid(); // random UUID.
const random = cryptoRandom(16); // random byte array.
const hash = await cryptoHash(true, file); // byte array of SHA2 512 bits hash value.
const keyEcdh = await cryptoGenerateKey(true); // public/private key pair for ECDH, each in byte array.
const keyEcdsa = await cryptoGenerateKey(false); // public/private key pair for ECDSA, each in byte array.
const encrypted = await cryptoEncrypt(keyEcdh, file); // encrypted byte array.
const decrypted = await cryptoDecrypt(keyEcdh, encrypted); // Restored.
const signature = await cryptoSign(keyEcdsa.privateKey, data); // signature byte array.
const verify = await cryptoVerify(signature, keyEcdsa.publicKey, data); // `true` if correct.

DEFLATE Compress

const file = await Deno.readFile("/path/to/binary.bin");

const encoded = await deflateEncode(file); // "deflate" compressed byte array.
const decoded = await deflateDecode(encoded); // Restored.

Extended Fetch API

const json = await fetchExtend("https://path/to/get", "json"); // response as JSON.
const bytes = await fetchExtend("https://path/to/get", "byte"); // response as Uint8Array.

Minipack Archive

const files = [
    ["binary.bin", Deno.readFileSync("/path/to/binary.bin")]
];

const encoded = await minipackEncode(files); // byte array in "minipack" format.
const decoded = await minipackDecode(encoded); // Restored.

Text Convert

const text = " Lorem ipsum  \t  dolor \r sit amet.";

const encoded = utfEncode(text); // byte array in UTF-8 format.
const decoded = utfDecode(encoded); // Restored.
const hexadecimal = hexEncode(encoded); // HEX string.
const formatted = trimExtend(decoded); // formatted string.

UnixTime Date

const date = new Date();

const encoded = unixtimeEncode(date); // unixtime in seconds.
const decoded = unixtimeDecode(encoded); // Restored.
const unixtime = unixtimeParse(date.toISOString()); // unixtime in seconds.

Path Operation (Deno Only)

const posix = posixSep("C:\\Users\\Administrator"); // POSIX style (slash) path string.
const win = winSep("C:/Users/Administrator"); // Windows style (backslash) path string.
const tmp = tmpPath(); // `/tmp` if running on Linux or Mac, `C:/Windows/Temp` if running on Windows.
const data = dataPath(); // `/var` if running on Linux or Mac, `C:/ProgramData` if running on Windows.
const home = homePath(); // `$HOME` if running on Linux or Mac, `%USERPROFILE%` if running on Windows.
const main = mainPath(); // Returns the directory of `Deno.mainModule`.

Platform Specific (Deno Only)

const iswin = isWin(); // "true" if running on Windows.

Details

It’s basically a thin wrapper around Deno’s functions to improve usability, but some features are original to this module.

This section describes the original features of this module.

Minipack

“Minipack” is a file archive format original to this module.

It’s structure is inspired by the famous “tar” and is minimal as an archive.

Originally developed for web browser, the purpose was to aggregate multiple files input with the HTML File API into a single binary.

Therefore, there is no concept of directory or filesystem, and it’s feature by simple structure that stores only the file body, file name, and hash value for verification.

The actual binary structure looks like this:

Index	Type	Title	Size (Byte)
1	Header	HashValue	32
2	Header	NameSize	1
3	Header	BodySize	4
4	Body	FileName	Max 255 (Defined in NameSize)
5	Body	FileBody	Max 4294967295 (Defined in BodySize)

This is for one file and repeats for the number of files.

Browser Compatible

Some methods and classes in this module don’t use globalThis.Deno internally and are browser compatible.

I have prepared browser compatible code only export as mod.universal.ts.

You can get bundled script in releases.

API

See Deno Document for details.