90 lines
2.9 KiB
JavaScript
90 lines
2.9 KiB
JavaScript
// AutistMask content script — bridges between inpage (window.ethereum)
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// and the background service worker via extension messaging.
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const {
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hasBrowserNamespace,
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runtimeApi,
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sendMessage,
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storageGet,
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storageSet,
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} = require("../shared/browserApi");
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// In Chrome (MV3), inpage.js runs as a MAIN-world content script declared
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// in the manifest, so no injection is needed here. In Firefox (MV2), the
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// "world" key is not supported, so we inject via a <script> tag.
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if (hasBrowserNamespace()) {
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const script = document.createElement("script");
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script.src = runtimeApi().getURL("src/content/inpage.js");
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script.onload = function () {
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this.remove();
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};
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(document.head || document.documentElement).appendChild(script);
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}
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// Send the persisted EIP-6963 provider UUID to the inpage script.
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// Generated once at install time and stored in extension storage.
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(async function sendProviderUuid() {
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let uuid = null;
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try {
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const items = await storageGet("eip6963Uuid");
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uuid = items?.eip6963Uuid;
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if (!uuid) {
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uuid = crypto.randomUUID();
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await storageSet({ eip6963Uuid: uuid });
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}
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} catch {
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// Storage was unavailable or refused the write. The announcement
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// still has to go out — a provider that never announces is invisible
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// to every EIP-6963 dApp — so it goes under a fresh uuid that this
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// page load will not outlive.
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if (!uuid) uuid = crypto.randomUUID();
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}
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window.postMessage(
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{ type: "AUTISTMASK_PROVIDER_UUID", uuid },
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location.origin,
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);
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})();
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// Relay requests from the page to the background script
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window.addEventListener("message", (event) => {
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if (event.source !== window) return;
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if (event.data?.type !== "AUTISTMASK_REQUEST") return;
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const { id, method, params } = event.data;
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sendMessage({
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type: "AUTISTMASK_RPC",
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id,
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method,
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params,
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origin: location.origin,
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})
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.then((response) => {
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if (response) {
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window.postMessage(
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{ type: "AUTISTMASK_RESPONSE", id, ...response },
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"*",
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);
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}
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})
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.catch(() => {
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// No receiver: the background context is gone. The page's promise
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// stays pending, which is what it did before this was a promise
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// at all; turning it into a rejection here is a change to what
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// dApps see and belongs to its own issue.
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});
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});
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// Listen for events pushed from the background (e.g. accountsChanged)
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runtimeApi().onMessage.addListener((msg) => {
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if (msg.type === "AUTISTMASK_EVENT") {
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window.postMessage(
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{
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type: "AUTISTMASK_EVENT",
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eventName: msg.eventName,
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data: msg.data,
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},
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"*",
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);
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}
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});
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