Firebase 云消息传递 - Django - 我如何服务工作者？

Question

更新自浅见处：

我已经阅读了很多关于 Service Workers 的文章，并且推进了我正在从事的项目，远远超过了我写这篇文章时的水平。

我在这里探索的主要问题（从域的根获得 firebase-messaging-sw.js 服务）已由下面的 ServiceWorkerView 解决。

有趣的事实：事实证明，firebase-messaging-sw.js 从域的根目录提供服务的原因是 Service Worker 的控制范围由 URL 定义。所以，同时：

http://whatever.com/firebase-messaging-sw.js掌控一切，

http://whatever.com/static/firebase-messaging-sw.js 只能控制 /static/ 下的所有内容（在这种情况下，只有 Django 提供的静态资源）。即使JS文件是静态的，它也需要控制该路径之外的页面。

A good starting point for learning about Service Workers

原题：

如何让 FCM service worker (firebase-messaging-sw.js) 在 Django 中工作？

我正在使用 django 和 fcm-django。

如何在根目录中提供 firebase-messaging-sw.js？

Django 默认在路径“/static/”下提供静态资源。将 STATIC_URL 更改为“/”使 firebase-messaging-sw.js 可用，但没有其他任何东西..

我尝试了将以下内容放入我的 urls.py 中的建议：

url(r'^(?!/static/.*)(?P<path>.*\..*)$', RedirectView.as_view(url='/static/%(path)s'))

虽然显然是对正则表达式魔法的光荣使用，但事实证明服务工作者不能支持重定向。（我想这也与有趣的事实有关）

我在 urlconf 中写了一个显式 URL 指向的视图。行得通。

class ServiceWorkerView(View):
    def get(self, request, *args, **kwargs):
        return render(request, 'fcmtest/firebase-messaging-sw.js')

urls.py:

path('firebase-messaging-sw.js', views.ServiceWorkerView.as_view(), name='service_worker')

现在 url http://localhost:8000/firebase-messaging-sw.js 服务于 javascript；然而，Firebase 抱怨内容类型是 text/plain

所以我将视图更改为：

class ServiceWorkerView(View):
    def get(self, request, *args, **kwargs):
        return render(request, 'fcmtest/firebase-messaging-sw.js', content_type="application/x-javascript")

我得到的错误是：

Uncaught (in promise) TypeError: Failed to register a ServiceWorker: A bad HTTP response code (404) was received when fetching the script.

我的firebase-messaging-sw.js（注释none of the console.log statements print）：

importScripts("https://www.gstatic.com/firebasejs/5.2.0/firebase-app.js");
importScripts("https://www.gstatic.com/firebasejs/5.2.0/firebase-messaging.js");
importScripts("https://www.gstatic.com/firebasejs/5.2.0/init.js");

// Initialize Firebase
var config = {
    apiKey: "AIzaSyBOb5gh1Lry84116M1uvAS_xnKtcWUoNlA",
    authDomain: "pyfcm-5f794.firebaseapp.com",
    databaseURL: "https://pyfcm-5f794.firebaseio.com",
    projectId: "pyfcm-5f794",
    storageBucket: "pyfcm-5f794.appspot.com",
    messagingSenderId: "813943398064"
};
console.log('in service worker - before initializeApp')
firebase.initializeApp(config);
console.log('in service worker - after initializeApp')

const messaging = firebase.messaging();
console.log('in service worker - after firebase.messaging')

// if the app is in the background (user not on page)
messaging.setBackgroundMessageHandler(function(payload) {
    console.log('in service worker - in setBackgroundMessageHandler')
    const title = "Hello World";
    const options = {
        body: payload.data.status
    }
    return self.registration.showNotification(title, options);
});

最后是我的设备注册页面（我不确定如何运行 javascript 然后提交。form.submit() 没有用，但那可能是因为其他事情不起作用..？ (fcm/fcmtest/templates/fcmtest/device_registration.html):

<head>
    {% load static %}
    <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">

    <title>FCM Device Registration</title>

    <!-- update the version number as needed -->
    <script src="https://www.gstatic.com/firebasejs/5.2.0/firebase.js"></script>
    <script>
    // Initialize Firebase
    var config = {
    apiKey: "AIzaSyBOb5gh1Lry84116M1uvAS_xnKtcWUoNlA",
    authDomain: "pyfcm-5f794.firebaseapp.com",
    databaseURL: "https://pyfcm-5f794.firebaseio.com",
    projectId: "pyfcm-5f794",
    storageBucket: "pyfcm-5f794.appspot.com",
    messagingSenderId: "813943398064"
    };

    firebase.initializeApp(config);
    </script>

    <script defer src="https://www.gstatic.com/firebasejs/5.2.0/firebase-app.js"></script>
    <!-- include only the Firebase features as you need -->
    <script defer src="https://www.gstatic.com/firebasejs/5.2.0/firebase-auth.js"></script>
    <!--<script defer src="https://www.gstatic.com/firebasejs/5.2.0/firebase-database.js"></script>-->
    <script defer src="https://www.gstatic.com/firebasejs/5.2.0/firebase-messaging.js"></script>
    <!--<script defer src="https://www.gstatic.com/firebasejs/5.2.0/firebase-storage.js"></script>-->
    <!-- initialize the SDK after all desired features are loaded -->
    <!--<script defer src="https://www.gstatic.com/firebasejs/5.2.0/init.js"></script>-->

</head>

<body>

<script>

function deviceRegistration() {
    console.log('in deviceRegistration()')
    firebase.initializeApp(config);
    const messaging = firebase.messaging();

    // public key generated in firebase console
    messaging.usePublicVapidKey("BMEoHrnzLq5WNeyahbSxJNTyS-44bXug2wetxAWVMLMSUIQE0dexhP4pJhcSA-ZlQlneHURmYQcnq9ofym_sStY");
    // console.log('{% static "firebase-messaging-sw.js" %}')
    console.log("/firebase-messaging-sw.js")
    // changed location passed to navigator.serviceWorker.register since I am no longer serving firebase-messaging.js from localhost/static/ (see that url hack)
    // navigator.serviceWorker.register('{% static "firebase-messaging-sw.js" %}')
    navigator.serviceWorker.register("/firebase-messaging-sw.js")
    .then((registration) => {
        console.log('before messaging.useServiceWorker')
        messaging.useServiceWorker(registration);
        console.log('after messaging.useServiceWorker')

        // Request permission and get token.....
        messaging.requestPermission()
        .then(function(){
            console.log("Have Permission");
        })
        .then(function(token) {
            form = document.getElementById("registration_form");

            registration_token = messaging.getToken();
            form.registration_id = registration_token;

            var isAndroid = navigator.userAgent.toLowerCase().indexOf("android") >= -1;
            if (isAndroid) {
                form.type = "android";
            } else {
                var isiOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
                if (isiOS) {
                    form.type = "ios";
                } else {
                    form.type = "web";
                }
            }

            //form.submit();
        })
        .catch(function(err){
            console.log("Permission denied");
        })
    });

    // request permission to send notifications
    messaging.requestPermission()
        .then(function(){
            console.log("Have Permission");
        })
        .then(function(token) {
            form = document.getElementById("registration_form");

            registration_token = messaging.getToken();
            form.registration_id = registration_token;

            var isAndroid = navigator.userAgent.toLowerCase().indexOf("android") >= -1;
            if (isAndroid) {
                form.type = "android";
            } else {
                var isiOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
                if (isiOS) {
                    form.type = "ios";
                } else {
                    form.type = "web";
                }
            }

            //form.submit();
        })
        .catch(function(err){
            console.log("Permission denied");
        })

    // if user is on the page then show message directly instead of a notification
    messaging.onMessage(function(payload) {
        console.log('payload: ', payload);
    });

}

</script>
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}


<form id="registration_form" method="post">{% csrf_token %}
    <input id="name" type="text" />
    <input id="type" type="hidden" />
    <input id="user" type="hidden" value="{{ user.id }}" />
    <input id="registration_id" type="hidden" />
    <input id="btn_register" type="button" value="Register" onclick="deviceRegistration();" />
</form>

</body>

我尝试按照以下说明添加 manifest.json https://firebase.google.com/docs/cloud-messaging/js/client

它目前由我的静态文件提供，并在注册和发送页面中链接

我的控制台中的错误：

Uncaught (in promise) TypeError: Failed to register a ServiceWorker: A bad HTTP response code (404) was received when fetching the script.

A bad HTTP response code (404) was received when fetching the script.

Failed to load resource: net::ERR_INVALID_RESPONSE

firebase-messaging-sw.js:3 Uncaught

(anonymous) @ firebase-messaging-sw.js:3

index.esm.js:1945 未捕获（承诺）

Object

browserErrorMessage:

"Failed to register a ServiceWorker: ServiceWorker script evaluation failed"

代码：

"messaging/failed-serviceworker-registration"

留言：

"Messaging: We are unable to register the default service worker. Failed to register a ServiceWorker: ServiceWorker script evaluation failed (messaging/failed-serviceworker-registration)."

堆栈：

"FirebaseError: Messaging: We are unable to register the default service worker. Failed to register a ServiceWorker: ServiceWorker script evaluation failed (messaging/failed-serviceworker-registration).↵ at https://www.gstatic.com/firebasejs/5.2.0/firebase-messaging.js:1:34104"

Answer 1

无法为 firebase-messaging-sw.js 提供服务的问题可以通过直接创建 ServiceWorkerView 到 GET 文件并硬编码 URLconf.[=25 来解决=]

fcm/fcmtest/views.py:

class ServiceWorkerView(View):
    def get(self, request, *args, **kwargs):
        return render(request, 'fcmtest/firebase-messaging-sw.js', content_type="application/x-javascript")

fcm/fcmtest/urls.py

app_name = 'fcmtest'
urlpatterns = [
    ...
    path('firebase-messaging-sw.js', views.ServiceWorkerView.as_view(), name='service_worker')
]

从域的根目录提供服务 firebase-messaging-sw.js 的原因是 Service Worker 的控制范围由 URL 路径定义。 Service Worker 可用路径下的所有内容都在其控制之下。

404 可能是由于 device_registration.html 中的 javascript 错误。 config 已被引用但尚未分配给。

function deviceRegistration() {
    firebase.initializeApp(config);

此外，使用 Firebase 云消息传递没有必要（甚至可能有问题）：

navigator.serviceWorker.register("/firebase-messaging-sw.js")
.then((registration) => {
    messaging.useServiceWorker(registration);
})

而是使用 firebase.initializeApp(config);

在根目录下服务 manifest.json 可能是个好主意。

form.submit() 的问题在于，用于根据 promise 更改表单中的元素的代码不完整。调试后它会很好用。

Answer 2

我喜欢 Inversus 所做的事情，因为它会在 dev/test/prod 中发挥作用。也就是说，在生产中我选择让 nginx 为 firebase-messaging-sw.js 文件提供服务。 . .

    # Firebase Cloud Messaging (FCM) requires this file to be served from
    # your root directory
    location =/firebase-messaging-sw.js {
        root /home/ubuntu/yourpath/yourproject/FCM/;
    }

Firebase 云消息传递 - Django - 我如何服务工作者？

Firebase Cloud Messaging - Django - how do I service worker?

javascript

django

firebase

firebase-cloud-messaging

pyfcm