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index.js
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index.js
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const React = require("react");
const { StyleSheet, View } = require("react-native");
const { WebView } = require("react-native-webview");
const { MainWorker, webViewWorkerString } = require("webview-crypto");
const styles = StyleSheet.create({
hide: {
display: "none",
position: "absolute",
width: 0,
height: 0,
flexGrow: 0,
flexShrink: 1
}
});
const internalLibrary = `
(function () {
function postMessage (message) {
if (window.ReactNativeWebView.postMessage === undefined) {
setTimeout(postMessage, 200, message)
} else {
window.ReactNativeWebView.postMessage(message)
}
}
var wvw = new WebViewWorker(postMessage)
// for android
window.document.addEventListener('message', function (e) {wvw.onMainMessage(e.data);})
// for ios
window.addEventListener('message', function (e) {wvw.onMainMessage(e.data);})
}())
`;
let resolveWorker;
let workerPromise = new Promise(resolve => {
resolveWorker = resolve;
});
function sendToWorker(message) {
workerPromise.then(worker => worker.onWebViewMessage(message));
}
const subtle = {
fake: true,
decrypt(...args) {
return workerPromise.then(worker => worker.crypto.subtle.decrypt(...args));
},
deriveBits(...args) {
return workerPromise.then(worker =>
worker.crypto.subtle.deriveBits(...args)
);
},
deriveKey(...args) {
return workerPromise.then(worker =>
worker.crypto.subtle.deriveKey(...args)
);
},
digest(...args) {
return workerPromise.then(worker => worker.crypto.subtle.digest(...args));
},
encrypt(...args) {
return workerPromise.then(worker => worker.crypto.subtle.encrypt(...args));
},
exportKey(...args) {
return workerPromise.then(worker =>
worker.crypto.subtle.exportKey(...args)
);
},
generateKey(...args) {
return workerPromise.then(worker =>
worker.crypto.subtle.generateKey(...args)
);
},
importKey(...args) {
return workerPromise.then(worker =>
worker.crypto.subtle.importKey(...args)
);
},
sign(...args) {
return workerPromise.then(worker => worker.crypto.subtle.sign(...args));
},
unwrapKey(...args) {
return workerPromise.then(worker =>
worker.crypto.subtle.unwrapKey(...args)
);
},
verify(...args) {
return workerPromise.then(worker => worker.crypto.subtle.verify(...args));
},
wrapKey(...args) {
return workerPromise.then(worker => worker.crypto.subtle.wrapKey(...args));
}
};
class PolyfillCrypto extends React.Component {
constructor(props) {
super(props);
this.props = props;
this.webViewRef = React.createRef();
this.state = {
webViewKey: 0,
};
}
shouldComponentUpdate(nextProps, nextState) {
return nextState.webViewKey !== this.state.webViewKey;
}
// reset promise so it can be resolved on next re-mount
componentWillUnmount() {
resolveWorker = undefined;
workerPromise = new Promise((resolve) => {
resolveWorker = resolve;
});
}
componentDidMount() {
const webView = this.webViewRef.current;
resolveWorker(
new MainWorker(msg => {
webView.postMessage(msg);
}, this.props.debug)
);
}
componentDidUpdate(prevProps, prevState) {
if (prevState.webViewKey !== this.state.webViewKey) {
const webView = this.webViewRef.current;
resolveWorker(
new MainWorker(
(msg) => {
webView.postMessage(msg);
},
this.props.debug
)
);
}
}
onContentProcessDidTerminate = (event) => {
const { nativeEvent } = event;
console.warn("Content process terminated, reloading", nativeEvent);
resolveWorker = undefined;
workerPromise = new Promise((resolve) => {
resolveWorker = resolve;
});
this.setState((prevState) => ({ webViewKey: prevState.webViewKey + 1 }));
};
render() {
const code = `((function () {${webViewWorkerString};${internalLibrary}})())`;
const html = `<html><body><script language='javascript'>${code}</script></body></html>`
// The uri 'about:blank' doesn't have access to crypto.subtle on android
// const uri = "file:///android_asset/blank.html";
// Base64 dance is to work around https://github.com/facebook/react-native/issues/20365
// const source = Platform.select({
// android: { source: { uri } },
// ios: undefined
// });
return (
<View style={styles.hide}>
<WebView
key={this.state.webViewKey}
javaScriptEnabled={true}
onContentProcessDidTerminate={this.onContentProcessDidTerminate}
onError={a =>
console.error(Object.keys(a), a.type, a.nativeEvent.description)
}
onMessage={ev => sendToWorker(ev.nativeEvent.data)}
ref={this.webViewRef}
originWhitelist={["*"]}
source={{ html: html, baseUrl: 'https://localhost' }}
/>
</View>
);
}
}
if (typeof global.crypto !== "object") {
global.crypto = {};
}
//required for webview-crypto serializer fromObject
global.crypto.fake = true;
if (typeof global.crypto.subtle !== "object") {
global.crypto.subtle = subtle;
}
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = PolyfillCrypto;