password-store-extension/extension/background.js

const tabForms = {};
const tabMatches = {};

let lastTabId = null;
let currentPageForms = null;
let currentPageMatches = null;
let addedContexts = [];

function askNative(msg) {
  const port = chrome.runtime.connectNative('ee.lunasqu.password_manager');

  return new Promise((resolve, reject) => {
    let gotResponse = false;
    port.onMessage.addListener((msg) => {
      gotResponse = true;
      resolve(msg);
      port.disconnect();
    });

    port.onDisconnect.addListener((msg) => {
      if (!gotResponse) {
        gotResponse = true;
        reject(msg);
      }
    });

    port.postMessage(msg);
  });
}

chrome.runtime.onInstalled.addListener(() => {
  chrome.contextMenus.create({
    id: 'fillContextMenu',
    title: 'Autofill password',
    contexts: ['editable'],
  });
});

function addContextMenuItems() {
  if (!currentPageMatches) {
    return;
  }

  clearContextMenu();
  for (const match of currentPageMatches) {
    const ctxID = `fill-${match}`;
    chrome.contextMenus.create({
      id: ctxID,
      title: match,
      contexts: ['editable'],
      parentId: 'fillContextMenu',
    });
    addedContexts.push(ctxID);
  }
}

function clearContextMenu() {
  addedContexts.forEach((id) => {
    try {
      chrome.contextMenus.remove(id);
    } catch (e) {
      console.error(e);
    }
  });
  addedContexts.length = 0;
}

async function injectForeground() {
  const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });

  if (!tab || !tab.url) {
    return;
  }

  lastTabId = tab.id;

  await chrome.scripting.executeScript({
    target: { tabId: tab.id },
    files: ['./foreground.js'],
  });

  const parsed = new URL(tab.url);

  askNative({
    domain: parsed.host,
  }).then(({ results }) => {
    if (results && results.length) {
      currentPageMatches = results;
      tabMatches[tab.id] = results;
      chrome.tabs.sendMessage(tab.id, {
        message: 'has_entries',
        payload: results,
      });
      addContextMenuItems();
    }
  });
}

async function sendPasswordToTab(rdata, existingTab) {
  const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
  const realTab = existingTab || tab;

  if (!realTab || !realTab.url) {
    return;
  }

  chrome.tabs.sendMessage(realTab.id, {
    message: 'fill_password',
    payload: rdata,
  });
}

chrome.webNavigation.onCompleted.addListener((ee) => {
  if (ee.frameType !== 'outermost_frame') {
    return;
  }
  currentPageForms = null;
  currentPageMatches = null;
  injectForeground();
});

chrome.tabs.onActivated.addListener(function (activeInfo) {
  lastTabId = activeInfo.tabId;
  currentPageForms = tabForms[activeInfo.tabId];
  currentPageMatches = tabMatches[activeInfo.tabId];

  clearContextMenu();
  if (currentPageMatches) {
    addContextMenuItems();
  }
});

chrome.tabs.onRemoved.addListener(function (tabId, info) {
  delete tabForms[tabId];
  delete tabMatches[tabId];
});

chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  if (request.message === 'login_forms') {
    if (sender && sender.tab && sender.tab.id) {
      tabForms[sender.tab.id] = request.payload;
    }

    if (sender.tab.id === lastTabId) {
      currentPageForms = request.payload;
    }
    sendResponse(true);
  }

  if (request.message === 'autofill') {
    askNative({
      getPassword: request.payload,
    }).then((response) => {
      sendPasswordToTab(response);
    });
    sendResponse(true);
  }
});

chrome.contextMenus.onClicked.addListener((info, tab) => {
  if (info && info.menuItemId && info.menuItemId.startsWith('fill-')) {
    const fillId = info.menuItemId.substring(5);
    askNative({
      getPassword: fillId,
    }).then((response) => {
      sendPasswordToTab(response, tab);
    });
  }
});