feat: replace browser login with imported Reddit sessions

extensions/reddit-session-exporter/service-worker.js

@@ -0,0 +1,58 @@
+import { createSessionExportDownload } from './session-export.js';
+
+const MATRIX_URLS = [
+  'https://matrix.redditspace.com/*',
+  'https://matrix.reddit.com/*',
+];
+
+chrome.webRequest.onBeforeSendHeaders.addListener(
+  async (details) => {
+    const authorization = details.requestHeaders?.find(
+      (header) => header.name.toLowerCase() === 'authorization',
+    )?.value;
+    if (!authorization?.toLowerCase().startsWith('bearer ')) return;
+
+    const url = new URL(details.url);
+    await chrome.storage.local.set({
+      matrixCapture: {
+        homeserver: `${url.protocol}//${url.host}`,
+        accessToken: authorization.slice('bearer '.length).trim(),
+        capturedAt: Date.now(),
+      },
+    });
+    await chrome.action.setBadgeText({ text: 'OK' });
+    await chrome.action.setBadgeBackgroundColor({ color: '#198754' });
+  },
+  { urls: MATRIX_URLS },
+  ['requestHeaders', 'extraHeaders'],
+);
+
+async function showError(message) {
+  await chrome.action.setBadgeText({ text: 'ERR' });
+  await chrome.action.setBadgeBackgroundColor({ color: '#dc3545' });
+  await chrome.action.setTitle({ title: `RedditBot export not ready: ${message}` });
+}
+
+chrome.action.onClicked.addListener(async () => {
+  try {
+    const cookies = await chrome.cookies.getAll({ domain: 'reddit.com' });
+    const { matrixCapture } = await chrome.storage.local.get('matrixCapture');
+    if (!matrixCapture) {
+      throw new Error('Open Reddit Chat, wait for it to load, then click the extension again.');
+    }
+
+    const whoami = await fetch(`${matrixCapture.homeserver}/_matrix/client/v3/account/whoami`, {
+      headers: { Authorization: `Bearer ${matrixCapture.accessToken}` },
+    });
+    if (!whoami.ok) throw new Error('The captured Reddit Chat token has expired. Reload Reddit Chat and try again.');
+    const identity = await whoami.json();
+    if (!identity?.user_id) throw new Error('Reddit Chat did not return an account identity.');
+
+    await chrome.downloads.download({
+      ...createSessionExportDownload(cookies, { ...matrixCapture, userId: identity.user_id }),
+      saveAs: true,
+    });
+  } catch (error) {
+    await showError(error instanceof Error ? error.message : 'Could not create the session dump.');
+  }
+});