python - 无法对 Matrix Routing v8 HereMaps API 上的异步请求进行身份验证

Question

我有一个有效的 HereMaps API key ，并且我正在使用 python requests lib 对异步调用后返回的链接执行 GET 请求。我试图像这样执行它:

https://aws-ap-southeast-1.matrix.router.hereapi.com/v8/matrix/01187ff8-7888-4ed6-af88-c8f9be9242d7/status?apiKey={my-api-key}

尽管我之前已经提供了正确的 key 来生成上面的此链接，但上面此请求的结果返回:

{
  "error": "Unauthorized",
  "error_description": "No credentials found"
}

我们应该如何进行身份验证以检查 Matrix Routing v8 API 上异步请求的状态结果？

Answer 1

有两种身份验证方法 available to you for using HERE APIs :API key 和 OAuth token 。

由于凭据的处理方式，当您发出异步请求时，您需要在使用 API key 时禁用自动客户端重定向，因为客户端不会再次添加 apiKey 参数到它已重定向到的 URL。

使用 Python 和 requests 时，这个问题有很多解决方案，下面是一个可能有帮助的完整示例:

import requests, time

api_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

# "Profile mode (car fastest)" example request
request = {
    "origins": [{"lat": 52.5309, "lng": 13.3849}, {"lat": 54.0924, "lng": 12.0991}],
    "destinations": [
        {"lat": 51.3397, "lng": 12.3731},
        {"lat": 51.0504, "lng": 13.7373},
    ],
    "regionDefinition": {"type": "world"},
    "profile": "carFast",
}

# Using a Session object allows you to persist certain parameters accross requests
# see: https://requests.readthedocs.io/en/master/user/advanced/
session = requests.Session()
# Add `?apiKey=xxxxxx` to all requests
session.params = {"apiKey": api_key}
# Raise an exception for any non 2xx or 3xx HTTP return codes
session.hooks = {"response": lambda r, *args, **kwargs: r.raise_for_status()}

# Send an asynchronous request, see: https://developer.here.com/documentation/matrix-routing-api/8.3.0/dev_guide/topics/get-started/asynchronous-request.html
status_response = session.post(
    "https://matrix.router.hereapi.com/v8/matrix", json=request
).json()

# Polling for the job status for 100 times
# You might want to use exponential back-off instead of time.sleep
for _ in range(0, 100):
    # do not follow the redirect here
    status_response = session.get(
        status_response["statusUrl"], allow_redirects=False
    ).json()

    if status_response["status"] == "completed":
        # download the result
        matrix_response = session.get(status_response["resultUrl"]).json()
        print(matrix_response)
        break
    elif status_response["accepted"] or status_response["inProgress"]:
        continue
    else:
        print(f"An error occured: {status_response}")
        break
    time.sleep(0.5)  # sleep for 500 ms

免责声明:我在 HERE Technologies 从事矩阵路由工作。