go-discord-bot/client/app/pages/downloader/downloader.tsx

import React from 'react';
import { axios } from '../../services';
import './downloader.scss';

interface State {
  fileType: string;
  url: string;
  message: string;
  downloadLink: string;
  downLoadFileName: string;
  dataLoading: boolean;
  dataLoaded: boolean;
}

export class Downloader extends React.Component<unknown, State> {
  constructor(props: unknown) {
    super(props);
    this.state = {
      fileType: 'mp3',
      url: '',
      message: '',
      dataLoaded: false,
      downloadLink: '',
      downLoadFileName: '',
      dataLoading: false,
    };
  }

  sendRequest() {
    if (this.state.url === '') {
      this.setState({
        message: 'Invalid URL',
      });

      return;
    }

    this.setState({
      message: '',
      url: '',
      dataLoaded: false,
      dataLoading: true,
    });

    axios
      .get(`/api/ytdownloader`, {
        params: {
          fileType: this.state.fileType,
          url: this.state.url,
        },
      })
      .then((res) => {
        this.setState({
          dataLoaded: true,
          dataLoading: false,
          downloadLink: `/public/youtube/${res.data.fileName}`,
          downLoadFileName: res.data.fileName,
        });
      })
      .catch(() => {
        this.setState({
          message: 'Internal error.',
          dataLoading: false,
        });
      });
  }

  render() {
    return (
      <div className="content">
        <div className="card">
          <div className="card__header">Youtube to MP3</div>

          <input
            placeholder="Enter Youtube URL"
            className="input downloader__input"
            value={this.state.url}
            onChange={(event) => this.setState({ url: event.target.value })}
          />

          <div style={{ marginBottom: '10px' }}>
            <button
              className="button button--primary"
              style={{ width: '100px', height: '40px', fontSize: 'large' }}
              onClick={this.sendRequest.bind(this)}
            >
              {this.state.dataLoading ? <i className="fa fa-spinner fa-spin fa-fw" /> : 'Convert'}
            </button>
          </div>

          {this.state.message !== '' && <div>{this.state.message}</div>}
          {this.state.dataLoaded && (
            <a href={this.state.downloadLink} download>
              {this.state.downLoadFileName}
            </a>
          )}
        </div>
      </div>
    );
  }
}