Firebase cloud messaging HTTP v1 send error - 400 Client Error: Bad Request for url: https://fcm.googleapis.com/v1/projects/<PROJECT_ID>/messages:send

Question

我尝试使用 Firebase 云消息传递 HTTP v1

这是运行在 Windows

下的 Python 代码

import json
import requests
from google.oauth2.service_account import Credentials
import google.auth.transport.requests

def _get_access_token():
    credentials = Credentials.from_service_account_file(
        'C:/yocto/wenote-notification/send_notification/wenote-206215-firebase-adminsdk-9fpls-a3fdd2934c.json',
        scopes=['https://www.googleapis.com/auth/firebase.messaging']
    )

    request = google.auth.transport.requests.Request()

    credentials.refresh(request)

    access_token = credentials.token

    return access_token

def generate_header():
    return {'Authorization' : 'Bearer ' + _get_access_token(), 'Content-type' : 'application/json'}


# Header    
headers = generate_header()
print(headers)


# Data
string = '{"message":{"token": "cSW75-6OF-w:APA91bE-E6vWucBe8rRijpDLlZGHhyfwoaLJr3R1TZEvieBM-__ZXwXlBS34kUticUN_eSbwvQGTymbmtd7sHT5U9O_v9HePyVn7jnUD9IBdoZZYSQ1CrgxXS1sz9wjAd5pKHIddoKj8", "data": {"sync": false, "sync_device_count": 2}, "fcm_options": {"analytics_label": "wenote_analytics_label"}}}'
request_data = json.loads(string)
print(request_data)


r = requests.post('https://fcm.googleapis.com/v1/projects/wenote-206215/messages:send', headers=headers, json=request_data)

if r.status_code != 200:
    r.raise_for_status()

我发送到 Firebase 服务器的消息是

{
   "message":{
      "token":"cSW75-6OF-w:APA91bE-E6vWucBe8rRijpDLlZGHhyfwoaLJr3R1TZEvieBM-__ZXwXlBS34kUticUN_eSbwvQGTymbmtd7sHT5U9O_v9HePyVn7jnUD9IBdoZZYSQ1CrgxXS1sz9wjAd5pKHIddoKj8",
      "data":{
         "sync":false,
         "sync_device_count":2
      },
      "fcm_options":{
         "analytics_label":"wenote_analytics_label"
      }
   }
}

但是，我收到以下错误

c:\yocto\wenote-notification\send_notification>python a.py
{'Authorization': 'Bearer ya29.c.Ko8BvQdCd-8US-DzQ-AcuTOURlGTQEvJt4mtofaeM08LRIhXBfC4RFN3QzkAcCdnaqI6uJLQlk1YJg67KQOhF8CtNux9t743nq2NN9uoW2mbQiB2y_2fjRUhiIIM7Wz2nt9rDOM4zFIFwKlHtLPXRLa4IGo0Ho-dq8zzVxQH1qPNGqy_ja8WowQCY5ReAQkmAmE', 'Content-type': 'application/json'}
{'message': {'token': 'cSW75-6OF-w:APA91bE-E6vWucBe8rRijpDLlZGHhyfwoaLJr3R1TZEvieBM-__ZXwXlBS34kUticUN_eSbwvQGTymbmtd7sHT5U9O_v9HePyVn7jnUD9IBdoZZYSQ1CrgxXS1sz9wjAd5pKHIddoKj8', 'data': {'sync': False, 'sync_device_count': 2}, 'fcm_options': {'analytics_label': 'wenote_analytics_label'}}}
Traceback (most recent call last):
  File "a.py", line 38, in <module>
    r.raise_for_status()
  File "C:\Python36\lib\site-packages\requests\models.py", line 940, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://fcm.googleapis.com/v1/projects/wenote-206215/messages:send

知道为什么会这样吗？我该如何解决？

我已经检查了我的 Firebase 云消息控制台。已启用。

Answer 1

您需要稍微调整 request_data 对象，因为架构已更改。

之前（旧版 http 协议）：

{
  "to": "/topics/news",
  "notification": {
    "title": "Breaking News",
    "body": "New news story available."
  },
  "data": {
    "story_id": "story_12345"
  }
}

（HTTP v1 API）之后：

{
  "message": {
    "topic": "news",
    "notification": {
      "title": "Breaking News",
      "body": "New news story available."
    },
    "data": {
      "story_id": "story_12345"
    }
  }
}

注意主题参数的变化，以及消息对象的换行。

查看本指南：https://firebase.google.com/docs/cloud-messaging/migrate-v1

您可以查看这个基于 python 的非常简洁和结构化的 FCM 最小示例：https://github.com/firebase/quickstart-python/blob/688fcfa8068dcac67978a171df828c9e77cd320e/messaging/messaging.py#L57

Answer 2

这就是调试上述问题的方法。

使用

if r.status_code != 200:
    print(r.text)
    r.raise_for_status()

而不是

if r.status_code != 200:
    r.raise_for_status()

我们会得到如下错误

{
  "error": {
    "code": 400,
    "message": "Invalid value at 'message.data[0].value' (TYPE_STRING), false\nInvalid value at 'message.data[1].value' (TYPE_STRING), 2",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "message.data[0].value",
            "description": "Invalid value at 'message.data[0].value' (TYPE_STRING), false"
          },
          {
            "field": "message.data[1].value",
            "description": "Invalid value at 'message.data[1].value' (TYPE_STRING), 2"
          }
        ]
      }
    ]
  }
}

看起来 HTTP v1 对值类型非常严格（必须是字符串）

因此，而不是使用

string = '{"message":{"token": "cSW75-6OF-w:APA91bE-E6vWucBe8rRijpDLlZGHhyfwoaLJr3R1TZEvieBM-__ZXwXlBS34kUticUN_eSbwvQGTymbmtd7sHT5U9O_v9HePyVn7jnUD9IBdoZZYSQ1CrgxXS1sz9wjAd5pKHIddoKj8", "data": {"sync": false, "sync_device_count": 2}, "fcm_options": {"analytics_label": "wenote_analytics_label"}}}'

我们需要使用

string = '{"message":{"token": "cSW75-6OF-w:APA91bE-E6vWucBe8rRijpDLlZGHhyfwoaLJr3R1TZEvieBM-__ZXwXlBS34kUticUN_eSbwvQGTymbmtd7sHT5U9O_v9HePyVn7jnUD9IBdoZZYSQ1CrgxXS1sz9wjAd5pKHIddoKj8", "data": {"sync": "false", "sync_device_count": "2"}, "fcm_options": {"analytics_label": "wenote_analytics_label"}}}'

Firebase cloud messaging HTTP v1 send error - 400 Client Error: Bad Request for url: https://fcm.googleapis.com/v1/projects/<PROJECT_ID>/messages:send

Firebase cloud messaging HTTP v1 send error - 400 Client Error: Bad Request for url: https://fcm.googleapis.com/v1/projects/<PROJECT_ID>/messages:send

python

firebase

firebase-cloud-messaging