react-native-scanner/Pages/InitScanner/index.js

import {useState} from 'react';
import {Constants} from '../../utils';
import {Button, HelperText, TextInput} from 'react-native-paper';
import {View} from 'react-native';
import EncryptedStorage from 'react-native-encrypted-storage';

export default function InitScanner({setScannerSession}) {
  const [host, setHost] = useState('http://192.168.178.93:8080/v1/scanner');
  const [scannerName, setScannerName] = useState('');

  const onAddScanner = () => {
    if (
      scannerName.length >= Constants.GLOBALS.MIN_SCANNER_NAME_LENGTH &&
      scannerName.length <= Constants.GLOBALS.MAX_SCANNER_NAME_LENGTH
    ) {
      fetch(host, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          scannerName: scannerName,
        }),
      })
        .then(res => {
          if (res.status === 200) {
            return res.json();
          }

          return Promise.reject(res.status);
        })
        .then(async data => {
          await EncryptedStorage.setItem('scanner_host', host);
          await EncryptedStorage.setItem('scanner_id', data.Id);
          setScannerSession(data.Session);
        })
        .catch(err => {
          console.error(err);
        });
    } else {
      console.log('scanner name invalid');
    }
  };

  const hasScannerNameErrors = () => {
    return (
      scannerName.length < Constants.GLOBALS.MIN_SCANNER_NAME_LENGTH ||
      scannerName.length > Constants.GLOBALS.MAX_SCANNER_NAME_LENGTH
    );
  };

  return (
    <View
      style={{
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#2c3e50',
      }}>
      <TextInput
        style={{
          width: '80%',
          borderRadius: 5,
          marginBottom: 10,
        }}
        label="Host"
        value={host}
        onChangeText={value => setHost(value)}
      />
      <TextInput
        style={{
          width: '80%',
          borderRadius: 5,
          marginBottom: 10,
        }}
        maxLength={Constants.GLOBALS.MAX_SCANNER_NAME_LENGTH}
        label="Scanner name"
        value={scannerName}
        onChangeText={value => setScannerName(value)}
      />
      <HelperText type="error" visible={hasScannerNameErrors()}>
        {'Scanner name is invalid! Min: ' +
          Constants.GLOBALS.MIN_SCANNER_NAME_LENGTH +
          ', Max: ' +
          Constants.GLOBALS.MAX_SCANNER_NAME_LENGTH}
      </HelperText>
      <Button
        disabled={hasScannerNameErrors()}
        mode="contained"
        onPress={() => onAddScanner()}>
        Add scanner
      </Button>
    </View>
  );
}