works/ProxyChanger/popup/popup.js


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const buttons = {
  direct: document.getElementById("direct_button"),
  system: document.getElementById("system_button"),
  proxy: document.getElementById("proxy_button"),
};

function setSelectedButton(button) {
  for (const key in buttons) {
    buttons[key].classList.remove("selected");
  }
  buttons[button].classList.add("selected");
}

browser.proxy.settings.get({}).then(({ value }) => {
  console.log("current proxy settings: ", value);
  if (value.proxyType === "none") {
    setSelectedButton("direct");
  } else if (value.proxyType === "system") {
    setSelectedButton("system");
  } else if (value.proxyType === "manual") {
    setSelectedButton("proxy");
  }
});

const proxyConfigs = {
  direct: {
    proxyType: "none",
  },
  system: {
    proxyType: "system",
  },
  proxy: {
    proxyType: "manual",
    http: "http://localhost:8888",
    httpProxyAll: true,
  },
};

for (const key in buttons) {
  buttons[key].addEventListener("click", () => {
    browser.proxy.settings.set({ value: proxyConfigs[key] }).then((success) => {
      if (success) {
        setSelectedButton(key);
      }
    });
  });
}