52 lines
1.6 KiB
TypeScript
52 lines
1.6 KiB
TypeScript
// Copyright 2019-2026 @polkadot/extension authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { Message } from '@polkadot/extension-base/types';
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import { MESSAGE_ORIGIN_CONTENT, MESSAGE_ORIGIN_PAGE, PORT_CONTENT } from '@polkadot/extension-base/defaults';
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import { ensurePortConnection } from '@polkadot/extension-base/utils/portUtils';
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import { chrome } from '@polkadot/extension-inject/chrome';
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let port: chrome.runtime.Port | undefined;
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function onPortMessageHandler (data: Message['data']): void {
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window.postMessage({ ...data, origin: MESSAGE_ORIGIN_CONTENT }, '*');
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}
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function onPortDisconnectHandler (): void {
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port = undefined;
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}
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const portConfig = {
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onPortDisconnectHandler,
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onPortMessageHandler,
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portName: PORT_CONTENT
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};
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// all messages from the page, pass them to the extension
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window.addEventListener('message', ({ data, source }: Message): void => {
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// only allow messages from our window, by the inject
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if (source !== window || data.origin !== MESSAGE_ORIGIN_PAGE) {
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return;
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}
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ensurePortConnection(port, portConfig).then((connectedPort) => {
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connectedPort.postMessage(data);
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port = connectedPort;
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}).catch((error) => console.error(`Failed to send message: ${(error as Error).message}`));
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});
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// inject our data injector
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const script = document.createElement('script');
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script.src = chrome.runtime.getURL('page.js');
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script.onload = (): void => {
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// remove the injecting tag when loaded
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if (script.parentNode) {
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script.parentNode.removeChild(script);
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}
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};
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(document.head || document.documentElement).appendChild(script);
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