java - AWS API Gateway custom authorizer. How to access principalId in lambda -


so trying set custom authorizer in api gateway.

i can forward request valid token lambda function specified in api method. cannot figure out how access principalid passed on authorizer though.

when executing request following in cloud watch log:

authorizer result body before parsing: {   "principalid": "16",   "policydocument": {     "version": "2012-10-17",     "statement": [       {         "condition": {},         "action": "execute-api:invoke",         "resource": [           "arn:aws:execute-api:eu-central-1:****:***/null/*/*"         ],         "effect": "allow"       },       {         "condition": {},         "action": "execute-api:invoke",         "resource": [],         "effect": "deny"       }     ]   } }

so how access principalid in lambda function? object passed on lambda? , if not, how @ least principalid passed?

the principalid can (and default is) forwarded lambda implementation. depending on mapping, principalid should appear in context variable.

you can access principalid value in mapping template using $context.authorizer.principalid variable. useful if want pass value backend. more information, see accessing $context variable.

use api gateway custom authorizers


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