Pass Environment variables to Kong Plugins

Define Environment variable

Define the environment variables as below

export HTTP_SSO_ENDPOINT=http://example.com 
export PROXY_SSO_ENDPOINT=http://example.com

How to inject it into Kong using NGINX environment variable

Kong by default will pick the environment variable KONG_NGINX_MAIN_ENV and inject into Kong.

For injecting the above environment variables into Kong add the following environment variable

export "KONG_NGINX_MAIN_ENV=HTTP_SSO_ENDPOINT;env PROXY_SSO_ENDPOINT"

This will inject the following into kong

env HTTP_SSO_ENDPOINT;env PROXY_SSO_ENDPOINT;

How to use these environment variables

Can use theses environment variables in multiple ways

1. Using vault

With in any plugin use the kong pdf vault as below to access the variable

kong.vault.get("{vault://env/HTTP_SSO_ENDPOINT}")

kong.vault.get("{vault://env/PROXY_SSO_ENDPOINT}")

Using vault PDK is sandbox safe

2. Using os

Another option is to get the variable using lua os

os.getenv("HTTP_SSO_ENDPOINT")
os.getenv("PROXY_SSO_ENDPOINT")

How to use the environment variable in plugin

Here is a example plugin using pre-function plugin.

Add the following in function config to print the environment in logs using pre-function.

local httpsso=kong.vault.get("{vault://env/HTTP_SSO_ENDPOINT}")kong.log(">>>>>>>>>>123456789<<<<<<<<<<<<<<<") kong.log(">>>>",httpsso,"<<<<<<<<<<")