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metamask-extension/app/scripts/lib/createOnboardingMiddleware.js

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JavaScript
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import log from 'loglevel';
import browser from 'webextension-polyfill';
/**
* Returns a middleware that intercepts `wallet_registerOnboarding` messages
*
* @param {{ location: string, registerOnboarding: Function }} opts - The middleware options
* @returns {(req: any, res: any, next: Function, end: Function) => void}
*/
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export default function createOnboardingMiddleware({
location,
registerOnboarding,
}) {
return async function originMiddleware(req, res, next, end) {
try {
if (req.method !== 'wallet_registerOnboarding') {
next();
return;
}
if (req.tabId && req.tabId !== browser.tabs.TAB_ID_NONE) {
await registerOnboarding(location, req.tabId);
} else {
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log.debug(
`'wallet_registerOnboarding' message from ${location} ignored due to missing tabId`,
);
}
res.result = true;
end();
} catch (error) {
end(error);
}
};
}