服务人员传播

Question

我有一个用于缓存图像的服务人员，这个服务人员只在前端模板中注册，但它仍会不断扩展到我的管理模板中。

这导致我的表单在验证令牌受到影响时表现得不可预测。

用一些安慰。日志我认为安装事件是在进入请求页面之前触发的，但我无法确定当前/下一个URL。

如何防止服务人员扩散到管理面板并干扰页面？我只想缓存资产。

就相关而言，这是我的服务人员：

const PRECACHE = 'precache-v1.0.0';
const RUNTIME = 'runtime';

// A list of local resources we always want to be cached.
const PRECACHE_URLS = [
    "public",
    "media",
    "unify",
];

importScripts('./cache-polyfill.js');

// The install handler takes care of precaching the resources we always need.
self.addEventListener('install', function(event) {
    console.log('installing resources');
    event.waitUntil(
        caches.open(PRECACHE)
            //.then(cache => cache.addAll(PRECACHE_URLS))
            .then(self.skipWaiting())
    );
});

// The activate handler takes care of cleaning up old caches.
self.addEventListener('activate', function(event) {
    const currentCaches = [PRECACHE, RUNTIME];
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return cacheNames.filter(cacheName => !currentCaches.includes(cacheName));
        }).then(cachesToDelete => {
            return Promise.all(cachesToDelete.map(cacheToDelete => {
                return caches.delete(cacheToDelete);
            }));
        }).then(() => self.clients.claim())
    );
});

// The fetch handler serves responses for same-origin resources from a cache.
// If no response is found, it populates the runtime cache with the response
// from the network before returning it to the page.
self.addEventListener('fetch', event => {
    // Skip cross-origin requests, like those for Google Analytics.

    if (event.request.method === "GET") {
        if (event.request.url.indexOf(PRECACHE_URLS) > -1) {
            console.log("fetching " + event.request.url + " by the service worker");
            event.respondWith(
                caches.match(event.request).then(cachedResponse => {
                    if (cachedResponse) {
                        return cachedResponse;
                    }

                    return caches.open(RUNTIME).then(cache => {
                        return fetch(event.request).then(response => {
                            // Put a copy of the response in the runtime cache.
                            return cache.put(event.request, response.clone()).then(() => {
                                console.log('cached: ' + event.request.url);
                                return response;
                            });
                        });
                    });
                })
            );
        }
        else {
            console.log("fetching " + event.request.url + " by service worker blocked, it's not a resource");
        }
    }
    return fetch(event.request);
});

Answer 1

问题很可能是您的管理页面位于软件范围内。这意味着您的软件控制，例如/和您的管理页面中的所有内容都位于/admin/或其他位置。

您可以通过检查SW正在拦截的读取请求来防止这种行为。类似的东西：

if (event.request.url.match('^.*(\/admin\/).*$')) {
    return false;
}

这应该是SW的fetch侦听器中的第一件事。它检查是否从管理页面收到请求，如果收到，则取消。否则，它将正常继续。