Question

我有一个角度2的应用，我通过http请求呼叫Firebase。但是，无论何时，我尝试运行该功能，我都会收到此错误：

Flowable<Tuple<Long, Integer>> findLineMarkers(
    Flowable<List<Tuple<Long, Integer>>> charPairs, 
    BiFunction<Tuple<Long, Integer>, Optional<Tuple<Long, Integer>>, Optional<Tuple<Long, Integer>>> strategy) { 

    return charPairs().map(pair -> {
            Tuple<Long, Integer> fst = pair.get(0);
            Optional<Tuple<Long, Integer>> snd = pair.size() > 1 ? Optional.of(pair.get(1)) : Optional.empty();

            return strategy.apply(fst, snd);
    }).filter(Optional::isPresent).map(Optional::get);
}

Flowable<SplitInfo> split(InputStream stream) throws IOException {

    return findLineMarkers(stream, startingPositionStrategy)
               .zipWith(findLineMarkers(stream, endingPositionStrategy), 
                        (s, e) -> new Split(s.item1, e.item1 - s.item1))
               .filter(split -> !removeEmptyLines || split.length > 0)
               .zipWith(counter(), Tuple::new)
               .timeInterval(TimeUnit.MILLISECONDS)
               .map(x -> new SplitInfo(x.value().item1.start,
                                       x.value().item1.length, 
                                       x.value().item2,
                                       x.time(), x.unit()));
}

以下是我的Firebase XMLHttpRequest cannot load https://us-central1-<my-projectId>.cloudfunctions.net/getUserByEmail?email=user@email.com. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access. The response had HTTP status code 500. error_handler.js:54 EXCEPTION: Response with status: 0 for URL: null ErrorHandler.handleError @ error_handler.js:54 next @ application_ref.js:348 schedulerFn @ async.js:93 SafeSubscriber.__tryOrUnsub @ Subscriber.js:234 SafeSubscriber.next @ Subscriber.js:183 Subscriber._next @ Subscriber.js:125 Subscriber.next @ Subscriber.js:89 Subject.next @ Subject.js:55 EventEmitter.emit @ async.js:79 NgZone.triggerError @ ng_zone.js:333 onHandleError @ ng_zone.js:294 ZoneDelegate.handleError @ zone.js:338 Zone.runTask @ zone.js:169 ZoneTask.invoke @ zone.js:420 Subscriber.js:238 Uncaught Response {_body: ProgressEvent, status: 0, ok: false, statusText: "", headers: Headers…}文件云功能：

index.js

接下来是我如何调用组件中的函数（假设HTTP请求成功）：

   const functions = require('firebase-functions');
    const admin = require('firebase-admin');
    admin.initializeApp(functions.config().firebase);
    const cors = require('cors')({origin: true});

    /**
     *  Function to get a user by email
     */
    exports.getUserByEmail = functions.https.onRequest((req, res) => {
      cors(request, response, () => {

// This should return a promise from the getUserByEmail function
response.status(200).send(admin.auth().getUserByEmail(req.query.email))
       })
    });

似乎无论我尝试什么，我都会遇到同样的问题。我甚至尝试将此部署到我的firebase托管网址，它仍然给我这个错误。谁知道我能在这做什么？

提前致谢！

Answer 1

所以我在这里犯了几个关键错误。

确保在初始化Firebase应用之前需要cors。
确保参数进入cors()功能。

以下是更新的index.js代码：

  const functions = require('firebase-functions');
    const admin = require('firebase-admin');
    const cors = require('cors')({origin: true});
    admin.initializeApp(functions.config().firebase);


    /**
     *  Function to get a user by email
     */
    exports.getUserByEmail = functions.https.onRequest((request, response) => {
      cors(request, response, () => {

// This should return a promise from the getUserByEmail function
response.status(200).send(admin.auth().getUserByEmail(req.query.email))
       })
    });

适用于Firebase的云功能 - 无法加载网址：否＆＃39;访问控制 - 允许 - 来源＆＃39;标题存在

1 个答案: