google-cloud-functions-tools 0.1.3

A set of utility tools (planned mostly to be decorators) for Google Cloud Functions

Google Cloud Functions Tools

A set of utility functions are provided, especially developed for Google Cloud Functions (might work on other serverless platforms too). The functions planned are mostly to be decorators.

CORS

Adds CORS headers to your function. Responds to OPTIONS request by sending CORS headers and without triggering the cloud function. Provided that Google Cloud Funtions use Flask for underlying logic, the return types must be compatible with Flask's.

For example:

@cors
def run(request):
    return 'Response text'

sets the following headers by default:

Access-Control-Allow-Origin: '*'
Access-Control-Allow-Methods: 'POST'
Access-Control-Allow-Headers: ''
Access-Control-Max-Age: 3600

However, these default values might change at any time, therefore it is better to specify headers explicitly:

@cors(origin='sample_origin',
      methods='GET',
      headers='Content-Type',
      max_age=9600)
def run(request):
    return 'Response text', 200

sets the following headers:

Access-Control-Allow-Origin: 'sample_origin'
Access-Control-Allow-Methods: 'GET'
Access-Control-Allow-Headers: 'Content-Type'
Access-Control-Max-Age: 9600

The method warns if Access-Control-Allow-Origin header is set to '*':

UserWarning: Setting Access-Control-Allow-Origin header to '*' is discouraged. It should not be used in production environments.

Contibuting

Pull requests and issues are welcomed. New functions are planned to be added in time when they are needed.