AWS API Gateway with proxy Lambda: Invalid permissions on Lambda function
I am using AWS API Gateway with a proxy Lambda, when the name of the lambda function is coming as a stage variable. Meaning I have a single API integration which connects to appropriate lambda according to the deployed stage.
See the general idea here:
When I test one of my stages (called: "staging") everything works fine, but when testing the other stage ("production") I get the error "Execution failed due to configuration error: Invalid permissions on Lambda function".
Things I already tested and verified:
1. Both lambdas which should be invoked by the API work well and as expected when tested from the Lambda dashboard.
2. I've made sure (many times) that I've given permission to the API gateway to invoke my lambda function (i.e. executed "aws lambda add-permission..."). I've validated the policy afterwards many times (i.e. executed "aws lambda get-policy...").
Any idea what else I can check ? What I might have forgotten here ? Thanks.
Couldn't find the reason but found a workaround which solved the problem. Instead of using $stageVariables as the Lambda function name, I explicitly wrote the names of the Lambda function I will be using one by one. This way AWS will give permission to the Lambda functions automatically (for each one u explicitly write). After that you can edit the integration back to using stage variables.
