#!/usr/bin/env bash

function error_handler() {
  >&2 echo "Exited with BAD EXIT CODE '${2}' in ${0} script at line: ${1}."
  exit "$2"
}
trap 'error_handler ${LINENO} $?' ERR
set -o errtrace -o errexit -o nounset -o pipefail

# this tests we can get a token from a public client and exchange it with a confidential client
# so we can see what resources that user has access to

# originally from https://medium.com/keycloak/keycloak-jwt-token-using-curl-post-72c9e791ba8c
# btw, meta config endpoint: http://localhost:7002/realms/spiffworkflow/.well-known/openid-configuration token exchange described at https://github.com/keycloak/keycloak-documentation/blob/main/securing_apps/topics/token-exchange/token-exchange.adoc
# some UMA stuff at https://github.com/keycloak/keycloak-documentation/blob/main/authorization_services/topics/service-authorization-obtaining-permission.adoc,
# though resource_set docs are elsewhere.

# ./bin/get_token # uses ciuser1 ciuser1
# ./bin/get_token ciadmin1 ciadmin1
# ./bin/get_token repeat_form_user_1 repeat_form_user_1 # actually has permissions to the resource in this script
# ./bin/get_token ciadmin1 ciadmin1 '%2Fprocess-models'

USERNAME=${1-admin}
PASSWORD=${2-admin}
REALM_NAME=${3-spiffworkflow}

if [[ -z "${BACKEND_BASE_URL:-}" ]]; then
  BACKEND_BASE_URL=http://localhost:7000
fi
if [[ -z "${BACKEND_CLIENT_ID:-}" ]]; then
  export BACKEND_CLIENT_ID=spiffworkflow-backend
fi
if [[ -z "${BACKEND_CLIENT_SECRET:-}" ]]; then
  export BACKEND_CLIENT_SECRET="JXeQExm0JhQPLumgHtIIqf52bDalHz0q"  # noqa: S105
fi

SECURE=false

BACKEND_BASIC_AUTH=$(echo -n "${BACKEND_CLIENT_ID}:${BACKEND_CLIENT_SECRET}" | base64)

if [[ -z "${OPENID_TOKEN_URL:-}" ]]; then
  if [[ -z "${KEYCLOAK_BASE_URL:-}" ]]; then
    if grep -qE "spiffworkflow.org" <<<"$BACKEND_BASE_URL" ; then
      env_domain=$(hot_sed -E 's/.*api\.(\w+\.spiffworkflow.org).*/\1/' <<<"${BACKEND_BASE_URL}")
      KEYCLOAK_BASE_URL="https://keycloak.${env_domain}"
    elif grep -qE "localhost:7000" <<<"$BACKEND_BASE_URL" ; then
      KEYCLOAK_BASE_URL="http://localhost:7002"
    fi
  fi
  OPENID_TOKEN_URL=$KEYCLOAK_BASE_URL/realms/$REALM_NAME/protocol/openid-connect/token
fi

>&2 echo "Using OPENID_TOKEN_URL: $OPENID_TOKEN_URL"
>&2 echo "realm: $REALM_NAME"
>&2 echo "client-id: $BACKEND_CLIENT_ID"
>&2 echo "username: $USERNAME"
>&2 echo "password: $PASSWORD"
>&2 echo "secure: $SECURE"


if [[ $SECURE = 'y' ]]; then
	INSECURE=
else
	INSECURE=--insecure
fi


### Basic auth test with backend
result=$(curl -s -X POST "$OPENID_TOKEN_URL" "$INSECURE" \
 -H "Content-Type: application/x-www-form-urlencoded" \
 -H "Authorization: Basic $BACKEND_BASIC_AUTH" \
 -d "username=$USERNAME" \
 -d "password=$PASSWORD" \
 -d 'grant_type=password' \
 -d "client_id=$BACKEND_CLIENT_ID" \
 -d "code=${USERNAME}:for-local-dev" \
)
backend_token=$(jq -r '.access_token' <<< "$result")
if [[ -z "$backend_token" || "$backend_token" == "null" ]]; then
  >&2 echo "ERROR: Could not get the backend token. Received result: ${result}"
  exit 1
fi
echo "$backend_token"