Feat: Add AWS SSM like variable functionality for GCP Secrets Manager

[felipegenef]

Add AWS SSM like variable functionality for GCP Secrets Manager

The Idea here is to make an alternative like AWS SSM variables from AWS provider on GCP provider.

How to use it

Add a variable to your GCP Secrets Manager and call gcp-sm passing key value and a default value (optional). Example of serverless.yml:

service: serverless-gcp-js

provider:
  name: google
  runtime: nodejs18
  region: ${file(./config/config.json):region}
  project: ${file(./config/config.json):project}
  credentials: ${file(./config/config.json):creds-file-path}
  environment:
    VAR1: ${gcp-sm(VAR1)} # Simplest way. Throw error if not found
    VAR2: ${gcp-sm(VAR2,"Default Var")} # Uses "Default Var" as value if not found
    VAR3: ${gcp-sm(VAR3-${opt:stage},"Default Var")} # Search for VAR3- + your stage passed on --stage (error if not passed). If value not found , uses "Default Var" as value
    VAR4: ${gcp-sm(VAR4-${opt:stage,"dev"},"Default Var")} # Search for VAR4- + your stage passed on --stage. If stage not found, uses VAR4-dev as default
    # If value above not found , uses "Default Var" as value

frameworkVersion: "3"

plugins:
  - serverless-google-cloudfunctions

package:
  exclude:
    - node_modules/**
    - .gitignore
    - .git/**

functions:
  first:
    handler: http
    events:
      - http: path
  second:
    handler: http
    environment:
      VAR1: ${gcp-sm(VAR1)} # Simplest way. Throw error if not found
      VAR2: ${gcp-sm(VAR2,"Default Var")} # Uses "Default Var" as value if not found
      VAR3: ${gcp-sm(VAR3-${opt:stage},"Default Var")} # Search for VAR3- + your stage passed on --stage (error if not passed). If value not found , uses "Default Var" as value
      VAR4: ${gcp-sm(VAR4-${opt:stage,"dev"},"Default Var")} # Search for VAR4- + your stage passed on --stage. If stage not found, uses VAR4-dev as default
      # If value above not found , uses "Default Var" as value
    events:
      - http: path