PermissionDenied: 403请求的身份验证范围不足

Question

为了让文本到语音转换API在GCE上的Python脚本中工作，我尝试使用在GCE下运行的以下代码：

"""Synthesizes speech from the input string of text or ssml.

Note: ssml must be well-formed according to:
    https://www.w3.org/TR/speech-synthesis/
"""

# Authorize server-to-server interactions from Google Compute Engine.
import httplib2
from oauth2client.contrib import gce

credentials = gce.AppAssertionCredentials(
  scope='https://www.googleapis.com/auth/cloud-platform')
http = credentials.authorize(httplib2.Http())

from google.cloud import texttospeech

# Instantiates a client
client = texttospeech.TextToSpeechClient()

# Set the text input to be synthesized
synthesis_input = texttospeech.types.SynthesisInput(text="This is a test. It is only a test.")

# Build the voice request, select the language code ("en-US") and the ssml
# voice gender ("neutral")
voice = texttospeech.types.VoiceSelectionParams(
    language_code='en-US',
    ssml_gender=texttospeech.enums.SsmlVoiceGender.NEUTRAL)

# Select the type of audio file you want returned
audio_config = texttospeech.types.AudioConfig(
    audio_encoding=texttospeech.enums.AudioEncoding.MP3)

# Perform the text-to-speech request on the text input with the selected
# voice parameters and audio file type
response = client.synthesize_speech(synthesis_input, voice, audio_config)

# The response's audio_content is binary.
with open('output.mp3', 'wb') as out:
    # Write the response to the output file.
    out.write(response.audio_content)
    print('Audio content written to file "output.mp3"')

我预计会有一个名为output.mp3的文件，其中会包含“这是一个测试，它只是一个测试”的表述。

我收到："PermissionDenied: 403请求没有足够的身份验证范围。“

我已经使用了You-Tube API，并且身份验证在此基础上工作。这里我漏掉了什么？

Answer 1

当您在GCE实例上时，请尝试将该实例的访问范围设置为“允许对所有云API的完全访问”，然后重试。

还要检查是否正确使用了客户端库和服务帐户密钥，如2所述

[1]https://cloud.google.com/compute/docs/access/service-accounts?hl=en_US&_ga=2.55324139.-1189275507.1546438047#accesscopesiam

[2]https://cloud.google.com/text-to-speech/docs/reference/libraries