How to access authorizer.claims from API gateway Lambda Auth with simple response mode in Flask API - flask

Question

Hi guys I struck with this for a days and I hope some of you can figure it out
I have lambda authorizer with simple response mode like this.
I want to forward value inside JWT token (user_id) to my Flask API.
My authorizer work fine but I don't know to access authorizer.claims in the Flask API.
exports.handler = async(event) => {
const method = 'main';
log.info(`[${method}] BEGIN`);
log.info(`[${method}] incoming event= ${JSON.stringify(event)}`);
const secret = await secretManager(secretName);
const response = {
isAuthorized: false,
context: {
authorizer: {
claims: {}
},
error: {}
}
};
const authorization = event.headers.authorization;
if(!authorization){
log.error(`[${method}] No authorization found`);
response.context.error.message = 'No authorization found';
response.context.error.responseType = 401;
return response;
}
const auth = authorization.split(' ');
if (auth[0] !== 'Bearer' || auth.length !== 2) {
log.error(`[${method}] Invalid authorization`);
response.context.error.message = 'Invalid authorization';
response.context.error.responseType = 401;
return response;
}
try {
const decoded = verify(auth[1], secret.public_key, {
algorithms: ['RS512'],
});
response.isAuthorized = true;
response.context.authorizer.claims = decoded;
} catch (error) {
log.error(`[${method}] Error occured:${error.message}`);
response.isAuthorized = false;
response.context.error.message = error.message;
response.context.error.responseType = 401;
}
log.info(`[${method}] END`);
return response;
};
And my Flask application be like this.
I used blueprint and app.before_request_funcs as a middlewares.
from api.middlewares.fetchUser import fetchUser
from api.routes.blueprint import myBlueprint
app.before_request_funcs = {
myBlueprint.name: [fetchUser]
}
app.register_blueprint(myBlueprint)
Here is where I want to access authorizer.claims to fetch user before my API start.
from flask import request, g
from api.utils.logger import logger
import json
def fetchUser():
logger.warn('FETCH USER')
logger.warn(json.dumps(request.headers.to_wsgi_list()))
logger.warn(json.dumps(request.authorization))
How to access authorizer.claims
Thanks you.