covidpass-greenpass-su-ipho.../components/Form.tsx

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import {saveAs} from 'file-saver';
import React, {FormEvent, useEffect, useRef, useState} from "react";
import {BrowserQRCodeReader} from "@zxing/browser";
import {Result} from "@zxing/library";
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import {useTranslation} from 'next-i18next';
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import Link from 'next/link';
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import Card from "./Card";
import Alert from "./Alert";
import {PayloadBody} from "../src/payload";
import {getPayloadBodyFromFile, getPayloadBodyFromQR} from "../src/process";
import {PassData} from "../src/pass";
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function Form(): JSX.Element {
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const { t } = useTranslation(['index', 'errors', 'common']);
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// Whether camera is open or not
const [isCameraOpen, setIsCameraOpen] = useState<boolean>(false);
// Global camera controls
const [globalControls, setGlobalControls] = useState(undefined);
// Currently selected QR Code / File. Only one of them is set.
const [qrCode, setQrCode] = useState<Result>(undefined);
const [file, setFile] = useState<File>(undefined);
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const [errorMessage, _setErrorMessage] = useState<string>(undefined);
const [loading, setLoading] = useState<boolean>(false);
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// Check if there is a translation and replace message accordingly
const setErrorMessage = (message: string) => {
const translation = t('errors:'.concat(message));
_setErrorMessage(translation !== message ? translation : message);
};
// File Input ref
const inputFile = useRef<HTMLInputElement>(undefined)
// Add event listener to listen for file change events
useEffect(() => {
if (inputFile && inputFile.current) {
inputFile.current.addEventListener('input', () => {
let selectedFile = inputFile.current.files[0];
if (selectedFile !== undefined) {
setQrCode(undefined);
setFile(selectedFile);
}
});
}
}, [inputFile])
// Show file Dialog
async function showFileDialog() {
inputFile.current.click();
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}
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// Hide camera view
async function hideCameraView() {
if (globalControls !== undefined) {
globalControls.stop();
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}
setIsCameraOpen(false);
}
// Show camera view
async function showCameraView() {
// Create new QR Code Reader
const codeReader = new BrowserQRCodeReader();
// Needs to be called before any camera can be accessed
await BrowserQRCodeReader.listVideoInputDevices();
// Get preview Element to show camera stream
const previewElem: HTMLVideoElement = document.querySelector('#cameraPreview');
// Set Global controls
setGlobalControls(
// Start decoding from video device
await codeReader.decodeFromVideoDevice(undefined,
previewElem,
(result, error, controls) => {
if (result !== undefined) {
setQrCode(result);
setFile(undefined);
controls.stop();
// Reset
setGlobalControls(undefined);
setIsCameraOpen(false);
}
}
)
);
setIsCameraOpen(true);
}
// Add Pass to wallet
async function addToWallet(event: FormEvent<HTMLFormElement>) {
event.preventDefault();
setLoading(true);
if (!file && !qrCode) {
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setErrorMessage('noFileOrQrCode')
setLoading(false);
return;
}
const color = (document.getElementById('color') as HTMLSelectElement).value;
let payloadBody: PayloadBody;
try {
if (file) {
payloadBody = await getPayloadBodyFromFile(file, color);
} else {
payloadBody = await getPayloadBodyFromQR(qrCode, color);
}
let pass = await PassData.generatePass(payloadBody);
const passBlob = new Blob([pass], {type: "application/vnd.apple.pkpass"});
saveAs(passBlob, 'covid.pkpass');
setLoading(false);
} catch (e) {
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setErrorMessage(e.message);
setLoading(false);
}
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}
return (
<div>
<form className="space-y-5" id="form" onSubmit={addToWallet}>
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<Card step="1" heading={t('index:selectCertificate')} content={
<div className="space-y-5">
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<p>{t('index:selectCertificateDescription')}</p>
<div className="grid grid-cols-1 md:grid-cols-2 gap-5">
<button
type="button"
onClick={isCameraOpen ? hideCameraView : showCameraView}
className="focus:outline-none h-20 bg-gray-500 hover:bg-gray-700 text-white font-semibold rounded-md">
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{isCameraOpen ? t('index:stopCamera') : t('index:startCamera')}
</button>
<button
type="button"
onClick={showFileDialog}
className="focus:outline-none h-20 bg-gray-500 hover:bg-gray-700 text-white font-semibold rounded-md">
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{t('index:openFile')}
</button>
</div>
<video id="cameraPreview"
className={`${isCameraOpen ? undefined : "hidden"} rounded-md w-full`}/>
<input type='file'
id='file'
accept="application/pdf,image/png"
ref={inputFile}
style={{display: 'none'}}
/>
{(qrCode || file) &&
<div className="flex items-center space-x-1">
<svg className="h-4 w-4 text-green-600" fill="none" viewBox="0 0 24 24"
stroke="currentColor">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M9 5l7 7-7 7"/>
</svg>
<span className="w-full truncate">
{
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qrCode && t('index:foundQrCode')
}
{
file && file.name
}
</span>
</div>
}
</div>
}/>
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<Card step="2" heading={t('index:pickColor')} content={
<div className="space-y-5">
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<p>{t('index:pickColorDescription')}</p>
<div className="relative inline-block w-full">
<select name="color" id="color"
className="bg-gray-200 dark:bg-gray-900 focus:outline-none w-full h-10 pl-3 pr-6 text-base rounded-md appearance-none cursor-pointer">
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<option value="white">{t('index:colorWhite')}</option>
<option value="black">{t('index:colorBlack')}</option>
<option value="grey">{t('index:colorGrey')}</option>
<option value="green">{t('index:colorGreen')}</option>
<option value="indigo">{t('index:colorIndigo')}</option>
<option value="blue">{t('index:colorBlue')}</option>
<option value="purple">{t('index:colorPurple')}</option>
<option value="teal">{t('index:colorTeal')}</option>
</select>
<div className="absolute inset-y-0 right-0 flex items-center px-2 pointer-events-none">
<svg className="w-5 h-5 fill-current" viewBox="0 0 20 20">
<path
d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z"
clipRule="evenodd" fillRule="evenodd"/>
</svg>
</div>
</div>
</div>
}/>
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<Card step="3" heading={t('index:addToWallet')} content={
<div className="space-y-5">
<p>
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{t('index:dataPrivacyDescription')}
<Link href="/privacy">
<a>
{t('index:privacyPolicy')}
</a>
</Link>.
</p>
<label htmlFor="privacy" className="flex flex-row space-x-4 items-center">
<input type="checkbox" id="privacy" value="privacy" required className="h-4 w-4"/>
<p>
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{t('index:iAcceptThe')}&nbsp;
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<Link href="/privacy">
<a className="underline">
{t('index:privacyPolicy')}
</a>
</Link>.
</p>
</label>
<div className="flex flex-row items-center justify-start">
<button id="download" type="submit"
className="focus:outline-none bg-green-600 py-2 px-3 text-white font-semibold rounded-md disabled:bg-gray-400">
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{t('index:addToWallet')}
</button>
<div id="spin" className={loading ? undefined : "hidden"}>
<svg className="animate-spin h-5 w-5 ml-2" viewBox="0 0 24 24">
<circle className="opacity-0" cx="12" cy="12" r="10" stroke="currentColor"
strokeWidth="4"/>
<path className="opacity-75" fill="currentColor"
d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"/>
</svg>
</div>
</div>
</div>
}/>
</form>
<canvas id="canvas" style={{display: "none"}}/>
{
errorMessage && <Alert errorMessage={errorMessage} onClose={() => setErrorMessage(undefined)}/>
}
</div>
)
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}
export default Form;