@dharitri-sdk/webview-provider
v0.0.1
Published
SDK Webview Provider
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drt-sdk-js-webview-provider
This provider is used to interact with the Dharitri dApps in a webview environment. It facilitates the communication between the host application (wallet) and the dApp.
Distribution
Installation
sdk-webview-provider is delivered via npm, therefore it can be installed as follows:
npm install @dharitri-sdk/webview-providerBuilding the library
In order to compile the library, run the following:
npm install
npm run compileUsage
Parent window
<html>
<head>
<meta charset="utf-8">
<title>Webview Provider Example</title>
</head>
<body>
<iframe id="webviewChild" src="http://child_URL/webviewChild.html" style="width: 100%; height: 200px;"></iframe>
<script>
// SigningProvider is one of the possible signing providers (extension, hardware wallet, etc.)
const signingProvider = new SigningProvider();
const webviewChild = document.getElementById("webviewChild");
const targetWindow = webviewChild.contentWindow;
window.addEventListener("message", async e => {
const { type, payload } = e.data;
switch (type) {
case "LOGIN_REQUEST":
const address = await signingProvider.login();
// generate accessToken using native auth client
const accessToken = "ZXJkMXdqeXRmbjZ6aHFmY3NlanZod3Y3cTR1c2F6czVyeWMzajhoYzc4ZmxkZ2pueWN0OHdlanFrYXN1bmM.Ykc5allXeG9iM04wLmY2ODE3NzUxMDc1NmVkY2U0NWVjYTg0Yjk0NTQ0YTZlYWNkZmEzNmU2OWRmZDNiOGYyNGM0MDEwZDE5OTA3NTEuMzAwLmV5SjBhVzFsYzNSaGJYQWlPakUyTnpNNU56SXlORFI5.a29dba3f0d2fb4712cb662bc8050c87bf9f0e7fd28f3c98efe0fda074be5b087bd75c075243e832c2985a9da044496b2cff3c852c8c963f9d3d840aed8799c07";
targetWindow?.postMessage({
type: "LOGIN_RESPONSE",
payload: {
data: {
address,
accessToken
}
},
})
break;
case "SIGN_TRANSACTIONS_REQUEST":
const transactions = payload;
const signedTransactions = await signingProvider.signTransactions(transactions);
targetWindow?.postMessage({
type: "SIGN_TRANSACTIONS_RESPONSE",
payload: {
data: signedTransactions
},
})
break;
case "SIGN_MESSAGE_REQUEST":
const messageToSign = payload?.message;
const signedMessage = await signingProvider.signMessage(messageToSign);
targetWindow?.postMessage({
type: "SIGN_MESSAGE_RESPONSE",
payload: {
data: {
signature: signedMessage.signature,
status: "signed"
}
},
})
break;
default:
// handle other message types
break;
}
})
</script>
</body>
</html>Child window
<html>
<head>
<meta charset="utf-8">
<title>Webview Provider Example (Child Window)</title>
</head>
<body>
<div>
<button onclick="webview.relogin()">Relogin</button>
<button onclick="webview.signTransactions()">Sign transactions</button>
<button onclick="webview.signMessage()">Sign message</button>
<button onclick="webview.logout()">Logout</button>
</div>
<script>
const webview = new WebviewProvider.getInstance({
resetStateCallback: () => console.log("Reset state callback called"),
});
</script>
</body>
</html>!!! Important !!!
Using WKWebView, you need to register an object to be the handler for a particular message: jsHandler.
Every message (action like login, signMessage, etc.) sent from the child webview is using the jsHandler object to send the message to the parent window. Eg. window.webkit.messageHandlers.jsHandler.postMessage({ type: "LOGIN_REQUEST" });
It's developer's responsibility to handle the message in the parent window and call the appropriate method on the webview object.