web3-file

The Web File implementation for Web3.

Table of Contents

• Motivation
• Install
• API
  • class Web3File
  • Web3File#name
  • Web3File#path
  • Web3File#lastModified
  • Web3File#content
  • Web3File#iterator()
  • Web3File#blob()
  • Web3File.fromBytes
  • Web3File.fromString
  • Web3File.fromReadableStream
  • Web3File.fromBlob
  • Web3File.fromFile%

Motivation

The Web File implementation and standard are still on their beginning.

The current implementation has a non standard File.webkitRelativePath read-only property that we cannot use outside the webkitdirectory context. As a result, we cannot set a File path programatically in the Browser, nor in Node.js @web-std/file.

Web3File bridges this gap by adding a path property and other extras, while being a close implementation of Web File. This allows files to be transformed into their UnixFs representation and back into the original structure, and leverage the IPFS Content Routing primitives.

Install

# install it as a dependency
$ npm i web3-file

API

To create your Web3File with an async iterable content, you can simply create an instance of Web3File. Otherwise, you can leverage one of the static functions provided to create a Web3File from another data type.

Please note that the same options of the constructor can be provided in the static functions.

class Web3File

Name	Type	Description
content	AsyncIterable<Uint8Array>	File content to be read
filename	string	filename
[options]	object	Web3File options
[options.path]	string	File Path
[options.lastModified]	number	Last modified timestamp

import { Web3File } from 'web3-file'

const file = new Web3File(
  fs.createReadStream('path/to/file.zip'),
  'file.zip',
  {
    path: 'path/to/file.zip',
    lastModified: Date.now()
  }
)

Web3File#name

• Returns string

Get file name.

Web3File#path

• Returns string

Get file path.

Web3File#lastModified

• Returns number

Get file last modified timestamp.

Web3File#content

• Returns AsyncIterable<Uint8Array>

Get file content readable source.

Web3File#iterator()

• Returns AsyncIterable<Uint8Array>

Get file content readable source iterator.

Web3File#blob()

• Returns Promise<Blob>

Get file content as a Blob.

Web3File.fromBytes

Takes Uint8Array bytes to create a Web3File.

import Web3File from 'web3-file'

const file = Web3File.fromBytes(new Uint8Array([2, 44, 1]), 'file.zip')

Web3File.fromString

Takes a string content to create a Web3File.

import { Web3File } from 'web3-file'

const file = Web3File.fromString('web3file', 'file.txt')

Web3File.fromReadableStream

Takes a Readable Stream content to create a Web3File.

import { Web3File } from 'web3-file'

const response = await fetch('https://example.org/image.png')
const file = Web3File.fromReadableStream(response.body, 'image.png')

Web3File.fromBlob

Takes a Blob content to create a Web3File.

import { Web3File } from 'web3-file'

const response = await fetch('https://example.org/image.png')
const blob = await response.blob()
const file = Web3File.fromBlob(blob, 'image.png')

Web3File.fromFile

Takes a File content to create a Web3File.

import { Web3File } from 'web3-file'

const image = new File([bytes], 'image.png')
const file = Web3File.fromFile(webFile)