Using Google Service Account in Azure App Service

prepare_google_service_account.py

'''
Simple method to dynamically create the google service account file in Azure App service

Steps
----------------------
i.   Add the service account file contents to Azure App Service configuration
ii.  The json contents will be available to your app at runtime as an environment variable, e.g. GOOGLE_CREDENTIALS
iii. When you app starts, save the contents of the environment variable to a file that you specified as your GOOGLE_APPLICATION_CREDENTIALS
'''
import os
import json
import logging

logging.basicConfig(level=logging.DEBUG)
log = logging.getLogger(__name__)

def prepare_gcp_service_account_file():
    log.debug('Preparing gcp service account file')
    gcp_service_account_filepath = os.getenv('GOOGLE_APPLICATION_CREDENTIALS')
    gcp_service_account_json_txt = os.getenv('GOOGLE_CREDENTIALS', default='')
    
    if gcp_service_account_json_txt != '':
        gcp_service_account_json_txt = gcp_service_account_json_txt.encode('unicode_escape').decode('UTF-8')
        jsondata = json.loads(gcp_service_account_json_txt)
        # This step is very important, else google wont recognise the private key
        jsondata["private_key"] = jsondata["private_key"].replace('\\n', '\n')
        with open(gcp_service_account_filepath, 'w') as f:
            json.dump(jsondata, f, indent=4)
            log.debug(f'Preparing  gcp service account done.')
            return
    log.warning(f'Credentials not found. $GOOGLE_CREDENTIALS is empty')