我正在关注此Google Firebase教程：https://cloud.google.com/appengine/docs/standard/python/authenticating-users-firebase-appengine
我在最后一部分它将注释添加到数据存储区但是当我按下按钮添加注释它没有做任何事情并在Firefox Web控制台中给出以下错误：
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://backend-dot-i7643225firenotes.appspot.com/notes. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
有什么想法导致这个？我没有触及谷歌提供的代码，但无论如何我都会包含它。其余部分可以在这里找到：
main.js
// Copyright 2016, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
$(function(){
// This is the host for the backend.
// TODO: When running Firenotes locally, set to http://localhost:8081. Before
// deploying the application to a live production environment, change to
// https://backend-dot-<PROJECT_ID>.appspot.com as specified in the
// backend's app.yaml file.
var backendHostUrl = 'https://backend-dot-i7643225firenotes.appspot.com'; //localhost:8081
// Initialize Firebase
// TODO: Replace with your project's customized code snippet
var config = {
apiKey: "REMOVED",
authDomain: "REMOVED",
databaseURL: "https://<DATABASE_NAME>.firebaseio.com",
storageBucket: "<BUCKET>.appspot.com",
};
// This is passed into the backend to authenticate the user.
var userIdToken = null;
// Firebase log-in
function configureFirebaseLogin() {
firebase.initializeApp(config);
// [START onAuthStateChanged]
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
$('#logged-out').hide();
var name = user.displayName;
/* If the provider gives a display name, use the name for the
personal welcome message. Otherwise, use the user's email. */
var welcomeName = name ? name : user.email;
user.getToken().then(function(idToken) {
userIdToken = idToken;
/* Now that the user is authenicated, fetch the notes. */
fetchNotes();
$('#user').text(welcomeName);
$('#logged-in').show();
});
} else {
$('#logged-in').hide();
$('#logged-out').show();
}
// [END onAuthStateChanged]
});
}
// [START configureFirebaseLoginWidget]
// Firebase log-in widget
function configureFirebaseLoginWidget() {
var uiConfig = {
'signInSuccessUrl': '/',
'signInOptions': [
// Leave the lines as is for the providers you want to offer your users.
firebase.auth.GoogleAuthProvider.PROVIDER_ID,
//firebase.auth.FacebookAuthProvider.PROVIDER_ID,
//firebase.auth.TwitterAuthProvider.PROVIDER_ID,
//firebase.auth.GithubAuthProvider.PROVIDER_ID,
firebase.auth.EmailAuthProvider.PROVIDER_ID
],
// Terms of service url
'tosUrl': '<your-tos-url>',
};
var ui = new firebaseui.auth.AuthUI(firebase.auth());
ui.start('#firebaseui-auth-container', uiConfig);
}
// [END configureFirebaseLoginWidget]
// [START fetchNotes]
// Fetch notes from the backend.
function fetchNotes() {
$.ajax(backendHostUrl + '/notes', {
/* Set header for the XMLHttpRequest to get data from the web server
associated with userIdToken */
headers: {
'Authorization': 'Bearer ' + userIdToken
}
}).then(function(data){
$('#notes-container').empty();
// Iterate over user data to display user's notes from database.
data.forEach(function(note){
$('#notes-container').append($('<p>').text(note.message));
});
});
}
// [END fetchNotes]
// [START signOutBtn]
// Sign out a user
var signOutBtn =$('#sign-out');
signOutBtn.click(function(event) {
event.preventDefault();
//FirebaseAuth.getInstance().signOut();
firebase.auth().signOut().then(function() {
console.log("Sign out successful");
}, function(error) {
console.log(error);
});
});
// [END signOutBtn]
// [START saveNoteBtn]
// Save a note to the backend
var saveNoteBtn = $('#add-note');
saveNoteBtn.click(function(event) {
event.preventDefault();
var noteField = $('#note-content');
var note = noteField.val();
noteField.val("");
/* Send note data to backend, storing in database with existing data
associated with userIdToken */
$.ajax(backendHostUrl + '/notes', {
headers: {
'Authorization': 'Bearer ' + userIdToken
},
method: 'POST',
data: JSON.stringify({'message': note}),
contentType : 'application/json'
}).then(function(){
// Refresh notebook display.
fetchNotes();
});
});
// [END saveNoteBtn]
configureFirebaseLogin();
configureFirebaseLoginWidget();
});
卖弄.朋友
# Copyright 2016 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# [START app]
import logging
from flask import Flask, jsonify, request
import flask_cors
from google.appengine.ext import ndb
import google.auth.transport.requests
import google.oauth2.id_token
import requests_toolbelt.adapters.appengine
# Use the App Engine Requests adapter. This makes sure that Requests uses
# URLFetch.
requests_toolbelt.adapters.appengine.monkeypatch()
HTTP_REQUEST = google.auth.transport.requests.Request()
app = Flask(__name__)
flask_cors.CORS(app)
# [START note]
class Note(ndb.Model):
"""NDB model class for a user's note.
Key is user id from decrypted token.
"""
friendly_id = ndb.StringProperty()
message = ndb.TextProperty()
created = ndb.DateTimeProperty(auto_now_add=True)
# [END note]
# [START query_database]
def query_database(user_id):
"""Fetches all notes associated with user_id.
Notes are ordered them by date created, with most recent note added
first.
"""
ancestor_key = ndb.Key(Note, user_id)
query = Note.query(ancestor=ancestor_key).order(-Note.created)
notes = query.fetch()
note_messages = []
for note in notes:
note_messages.append({
'friendly_id': note.friendly_id,
'message': note.message,
'created': note.created
})
return note_messages
# [END query_database]
# [START list_notes]
@app.route('/notes', methods=['GET'])
def list_notes():
"""Returns a list of notes added by the current Firebase user."""
# Verify Firebase auth.
# [START verify_token]
id_token = request.headers['Authorization'].split(' ').pop()
claims = google.oauth2.id_token.verify_firebase_token(
id_token, HTTP_REQUEST)
if not claims:
return 'Unauthorized', 401
# [END verify_token]
notes = query_database(claims['sub'])
return jsonify(notes)
# [END list_notes]
# [START add_note]
@app.route('/notes', methods=['POST', 'PUT'])
def add_note():
"""
Adds a note to the user's notebook. The request should be in this format:
{
"message": "note message."
}
"""
# Verify Firebase auth.
id_token = request.headers['Authorization'].split(' ').pop()
claims = google.oauth2.id_token.verify_firebase_token(
id_token, HTTP_REQUEST)
if not claims:
return 'Unauthorized', 401
# [START create_entity]
data = request.get_json()
# Populates note properties according to the model,
# with the user ID as the key name.
note = Note(
parent=ndb.Key(Note, claims['sub']),
message=data['message'])
# Some providers do not provide one of these so either can be used.
note.friendly_id = claims.get('name', claims.get('email', 'Unknown'))
# [END create_entity]
# Stores note in database.
note.put()
return 'OK', 200
# [END add_note]
@app.errorhandler(500)
def server_error(e):
# Log the error and stacktrace.
logging.exception('An error occurred during a request.')
return 'An internal error occurred.', 500
# [END app]
我自己尝试了the tutorial，一切都运行正常，所以我猜你可能要么跳过了一些步骤，要么你的配置有些错误。
我在您的示例和我的示例之间看到的唯一值得注意的差异如下，因此您可以尝试修改它们以查看您的问题是否得到解决：
import error，所以我将这行werkzeug==0.12.2添加到backend/requirements.txt文件中，其中包含将要安装的库。 werzeug库的最新版本已经将一些依赖项移动到嵌套文件夹，这是导致某些导入失败的原因（您可以阅读更多here）。然后，删除lib文件夹并重新运行命令以安装库pip install -r requirements.txt -t lib。在进行此修改之前，我遇到了与您相同的问题，单击我的应用程序中的“保存”按钮时没有任何反应，但在更改之后，它运行正常。config文件中的frontend/main.js变量有一些你已删除的字段。我获得了this guide之后的参数并转到我的Firebase控制台，点击“将Firebase添加到您的Web应用程序”按钮，并按如下方式复制内容：config中的frontend/main.js变量：
var config = {
apiKey: "<API_KEY>",
authDomain: "<PROJECT_ID>.firebaseapp.com",
databaseURL: "https://<PROJECT_ID>.firebaseio.com",
projectId: "<PROJECT_ID>",
storageBucket: "<PROJECT_ID>.appspot.com",
messagingSenderId: "<SOME_ID>"
};
至于其余部分，一切看起来都很好，只是我刚刚尝试使用firebase.auth.GoogleAuthProvider.PROVIDER_ID而我已经删除了所有其余部分。我也在生产中运行应用程序（App Engine Standard），而不是使用本地开发服务器。我也看了一下我的CORS配置，我没有什么特别的，只有你代码中已有的几行：
app = Flask(__name__)
flask_cors.CORS(app)
您应该尝试我提供的一些建议，如果它不断出现，请返回有关错误的更多信息。