Dynamic ARN to Custom Request Lambda Authorizer

Serverless Framework
1

Receiving ‘TypeError: functionArn.split is not a function’ error when performing ‘serverless deploy’ when using import of arn value from Stack One in Stack Two for an authorizer arn value.

Using serverless version 2.72.3

I have two stacks. One that declares the lambda that handles the authorization logic, and another stack that wants to make use of the lambda as an authorizer.

Stack One:

...
...
functions:
  authorizer-with-user-data:
      handler: authorizer-with-user-data/index.authorize
      environment:
          ...
...
...
Outputs:
    AuthorizerWithUserDataARN:
      Value:
        Fn::GetAtt:
          - AuthorizerDashwithDashuserDashdataLambdaFunction
          - Arn
      Export:
        Name: ${self:provider.stage}-AuthorizerWithUserDataArn

Stack Two (works):

custom:
   ...
   authorizerWithUserDataArn: arn:aws:lambda:us-east-1:${self:custom.accountId.${self:provider.stage}}:function:auth-${self:provider.stage}-authorizer-with-user-data


functions:
  get:
    handler: get/index.get
    events:
      - http:
          path: /
          method: get
          authorizer:
            name: authorizer
            arn: ${self:custom.authorizerWithUserDataArn}
            resultTtlInSeconds: 0
            identitySource: ''
            type: request

This version of Stack Two works as the custom variable is set as a string within the stack. When the authorizerWithUserDataArn variable is set referencing the output variable AuthorizerWithUserDataARN from Stack One, then this doesn’t work and the following error is provided from serverless cli.

Stack Two (does not work):

custom:
   ...
   authorizerWithUserDataArn:
      'Fn::ImportValue': "${self:provider.stage}-AuthorizerWithUserDataArn"


functions:
  get:
    handler: get/index.get
    events:
      - http:
          path: /
          method: get
          authorizer:
            name: authorizer
            arn: ${self:custom.authorizerWithUserDataArn}
            resultTtlInSeconds: 0
            identitySource: ''
            type: request

Error Received when performing ‘serverless deploy’

...
...
...
Serverless: Packaging service...
Serverless: Generating custom CloudFormation resources...

Type Error ----------------------------------------------

  TypeError: functionArn.split is not a function
      at Object.extractAuthorizerNameFromArn (/Users/psaha/Code/fleetoperate-businessportal-services/carriers-api/carrier-companies/node_modules/serverless/lib/plugins/aws/lib/naming.js:140:34)
      ...

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          [removed link due to serverless forum 2 link max limit]
     Issues:        forum.serverless.com

  Your Environment Information ---------------------------
     Operating System:          darwin
     Node Version:              14.19.1
     Framework Version:         2.72.3 (local)
     Plugin Version:            5.5.4
     SDK Version:               4.3.2
     Components Version:        3.18.2
...
...
...
2

Similar posts: Dynamic ARN to Cognito authorizer - #8 by RobertBrewitz