google-chrome - Chrome 扩展程序的 activeTab 权限问题

Question

我在我的 Chrome 扩展程序的 background.js 脚本中运行以下代码:

chrome.browserAction.onClicked.addListener(captureCurrentTab());

function handleCapture(stream) {
  console.log('content captured');
  console.log("backround.js stream: ", stream);
  alert(stream);

  // localStream = stream; // used by RTCPeerConnection addStream();
  // initialize(); // start signalling and peer connection process
}

function captureCurrentTab() {
  console.log('reqeusted current tab');
  chrome.tabs.query({active : true}, function(tab) {
      console.log('got current tab');

      chrome.tabCapture.capture({
          audio : true,
          video : false
      }, handleCapture);
  });
}    

但是，这给了我以下错误:

Unchecked runtime.lastError while running tabCapture.capture: Extension has not been invoked for the current page (see activeTab permission). Chrome pages cannot be captured.

但是，我特别在 manifest.json 中授予 activeTab 权限:

"permissions": [
    "tabs",
    "tabCapture",
    "activeTab",
 ]

谢谢你的帮助!

Answer 1

当 activeTab 声明权限后，只有当用户执行某些暗示他们希望您具有访问权限的操作时，您才能访问当前选项卡。

The following user gestures enable activeTab:

• Executing a browser action
• Executing a page action
• Executing a context menu item
• Executing a keyboard shortcut from the commands API
• Accepting a suggestion from the omnibox API

该错误告诉您捕获当前选项卡，因为用户尚未执行上面列出的操作之一。

看起来您可能已经理解了这一点，只是在您的代码中有一个错误。注册时 captureCurrentTab作为浏览器操作的单击监听器，您实际上是立即执行它，而不是通过引用传递函数。将您的第一行更改为:

// Remove the () after captureCurrentTab
chrome.browserAction.onClicked.addListener(captureCurrentTab);