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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.
//
// SPDX-License-Identifier: BSD-3-Clause
import React from 'react';
import QrSigner from '@parity/qr-signer';
import loading from '../assets/img/icons/loading.svg';
export default class Scanner extends React.PureComponent {
state = {
webcamError: null,
isLoading: true
};
componentDidMount () {
this.checkForWebcam();
if (navigator.mediaDevices) {
navigator.mediaDevices.addEventListener(
'devicechange',
this.checkForWebcam
);
}
}
componentWillUnmount () {
if (navigator.mediaDevices && navigator.mediaDevices.ondevicechange) {
navigator.mediaDevices.removeEventListener(
'devicechange',
this.checkForWebcam
);
}
}
checkForWebcam = async () => {
if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
try {
await navigator.mediaDevices.getUserMedia({ video: true });
this.setState({
webcamError: null,
isLoading: false
});
} catch (e) {
let errorMessage;
switch (e.name) {
case 'NotAllowedError':
case 'SecurityError':
errorMessage = 'Access to the webcam was refused.';
break;
case 'NotFoundError':
case 'OverconstrainedError':
errorMessage = 'No webcam found on the device.';
break;
case 'NotReadableError':
errorMessage =
'Webcam hardware error. Try restarting your computer';
break;
default:
errorMessage = 'Unknown error.';
}
this.setState({
webcamError: errorMessage,
isLoading: false
});
}
}
};
render () {
const { onScan, label } = this.props;
const { webcamError, isLoading } = this.state;
const size = 300;
return (
<div>
{isLoading ? (
<img alt='loading' src={loading} />
) : webcamError ? (
<p>{webcamError}</p>
) : (
<div>
<p>{label}</p>
<QrSigner scan onScan={onScan} size={size} />
</div>
)}
</div>
);
}
}