skynet-webportal/packages/sia-skynet/src/components/HomeUpload/HomeUpload.js

import React, { Component } from 'react'
import classNames from 'classnames'
import Dropzone from 'react-dropzone'
import Reveal from 'react-reveal/Reveal'
import shortid from 'shortid';
import { Button, UploadFile } from '../'
import { Deco3, Deco4, Deco5, Folder, DownArrow } from '../../svg'
import './HomeUpload.scss'

export default class HomeUpload extends Component {
  state = { files: [] }

  handleDrop = async acceptedFiles => {
    this.setState({
      files: [
        ...acceptedFiles.map(file => ({ file, status: 'uploading' })),
        ...this.state.files,
      ],
    })

    const onComplete = (file, status, skylink) => {
      this.setState(state => {
        const index = state.files.findIndex(f => f.file === file)

        return {
          files: [
            ...state.files.slice(0, index),
            {
              ...state.files[index],
              status,
              url: `https://siasky.net/${skylink}`,
            },
            ...state.files.slice(index + 1),
          ],
        }
      })
    }

    acceptedFiles.forEach(async file => {
      try {
        const fd = new FormData()
        fd.append('file', file)
        
        const uuid = shortid.generate();
        const response = await fetch(`/skynet/skyfile/${uuid}`, { method: 'POST', body: fd })
        const { skylink } = await response.json()

        onComplete(file, 'complete', skylink)
      } catch (error) {
        onComplete(file, 'error')
      }
    })
  }

  handleSkylink = event => {
    event.preventDefault()

    const skylink = event.target.skylink.value.replace('sia://', '')

    if (skylink.match(/^[a-zA-Z0-9_-]{46}$/)) {
      window.open(`/${event.target.skylink.value}`, '_blank')
    }
  }

  render() {
    return (
      <Reveal effect="active">
        <div className="home-upload">
          <div className="home-upload-white fadeInUp delay4">
            <div className="home-upload-split">
              <div className="home-upload-box ">
                <Dropzone onDrop={acceptedFiles => this.handleDrop(acceptedFiles)}>
                  {({ getRootProps, getInputProps, isDragActive }) => (
                    <>
                      <div
                        className={classNames('home-upload-dropzone', {
                          'drop-active': isDragActive,
                        })}
                        {...getRootProps()}
                      >
                        <span className="home-upload-text">
                          <h3>Pin a File</h3>
                          Drag &amp; drop your file(s) here to pin
                        </span>
                        <Button iconLeft>
                          <Folder />
                          Browse
                        </Button>
                      </div>
                      <input {...getInputProps()} className="offscreen" />
                    </>
                  )}
                </Dropzone>
              </div>

              <div className="home-upload-retrieve">
                <div className="home-upload-text">
                  <h3>Have a Skylink?</h3>
                  <p>Enter the ID to retrieve the file</p>

                  <form className="home-upload-retrieve-form" onSubmit={this.handleSkylink}>
                    <input name="skylink" type="text" placeholder="sia://" />
                    <button type="submit">
                      <DownArrow />
                    </button>
                  </form>
                </div>
              </div>
            </div>

            {this.state.files.length > 0 && (
              <div className="home-uploaded-files">
                {this.state.files.map((file, i) => {
                  return <UploadFile key={i} {...file} />
                })}
              </div>
            )}
          </div>

          <p className="bottom-text fadeInUp delay5">
            Once a file has been uploaded, a 46 byte link called a 'Skylink' is generated. That link can then be shared
            with anyone to fetch the file from Skynet.
          </p>

          <Deco3 className="deco-3 fadeInUp delay6" />
          <Deco4 className="deco-4 fadeInUp delay6" />
          <Deco5 className="deco-5 fadeInUp delay6" />
        </div>
      </Reveal>
    )
  }
}