Short example on how to secure use Speech API on a frontend client

invoke_speech.py

import azure.cognitiveservices.speech as speechsdk
import requests

# Access key to Speech API from Azure (this needs to be stored in the backend and show not get to the client)
access_key = 'xxxxxxxxxxxx'
region = "westeurope"

# This method should run in the backend, so that access_key is not needed in the client
def get_auth_token(access_key):
    fetch_token_url = f"https://{region}.api.cognitive.microsoft.com/sts/v1.0/issueToken"
    headers = {
        'Ocp-Apim-Subscription-Key': access_key
    }
    response = requests.post(fetch_token_url, headers=headers)
    auth_token = str(response.text)
    return auth_token

# This call happens on the client side (calling the backend), as auth_token expires after 10 minutes
auth_token = get_auth_token(access_key)
    
speech_config = speechsdk.SpeechConfig(auth_token=auth_token, region=region)
speech_config.speech_recognition_language="de-DE"

def from_file():
    audio_input = speechsdk.AudioConfig(filename="test.wav")
    speech_recognizer = speechsdk.SpeechRecognizer(speech_config=speech_config, audio_config=audio_input)
    
    result = speech_recognizer.recognize_once_async().get()
    print(result.text)

from_file()