spiffworkflow-backend/bin/get_token

#!/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'

HOSTNAME=localhost:7002
REALM_NAME=spiffworkflow
USERNAME=${1-ciuser1}
PASSWORD=${2-ciuser1}
URI_TO_TEST_AGAINST=${3-'%2Fprocess-models%2Fcategory_number_one%2Fprocess-model-with-repeating-form'}

FRONTEND_CLIENT_ID=spiffworkflow-frontend
BACKEND_CLIENT_ID=spiffworkflow-backend
BACKEND_CLIENT_SECRET="JXeQExm0JhQPLumgHtIIqf52bDalHz0q"  # noqa: S105
SECURE=false

BACKEND_BASIC_AUTH=$(echo -n "${BACKEND_CLIENT_ID}:${BACKEND_CLIENT_SECRET}" | base64)
KEYCLOAK_URL=http://$HOSTNAME/realms/$REALM_NAME/protocol/openid-connect/token

echo "Using Keycloak: $KEYCLOAK_URL"
echo "realm: $REALM_NAME"
echo "client-id: $FRONTEND_CLIENT_ID"
echo "username: $USERNAME"
echo "password: $PASSWORD"
echo "secure: $SECURE"


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

result=$(curl -s -X POST "$KEYCLOAK_URL" "$INSECURE" \
 -H "Content-Type: application/x-www-form-urlencoded" \
 -d "username=$USERNAME" \
 -d "password=$PASSWORD" \
 -d 'grant_type=password' \
 -d "client_id=$FRONTEND_CLIENT_ID" \
)
frontend_token=$(jq -r '.access_token' <<< "$result")

result=$(curl -s -X POST "$KEYCLOAK_URL" "$INSECURE" \
 -H "Content-Type: application/x-www-form-urlencoded" \
 --data-urlencode 'grant_type=urn:ietf:params:oauth:grant-type:token-exchange' \
 -d "client_id=$BACKEND_CLIENT_ID" \
 -d "subject_token=${frontend_token}" \
 -H "Authorization: Basic $BACKEND_BASIC_AUTH" \
 -d "audience=${BACKEND_CLIENT_ID}" \
)
backend_token=$(jq -r '.access_token' <<< "$result")

if [[ "$backend_token" != 'null' ]]; then
  echo "backend_token: $backend_token"

  echo "Getting resource set"
  resource_result=$(curl -s "http://localhost:7002/realms/spiffworkflow/authz/protection/resource_set?matchingUri=true&deep=true&max=-1&exactName=false&uri=${URI_TO_TEST_AGAINST}" -H "Authorization: Bearer $backend_token")

  resource_ids=$(jq -r '.[] | ._id' <<<"$resource_result" || echo '')
  if [[ -z "$resource_ids" || "$resource_ids" == "null" ]]; then
    >&2 echo "ERROR: Could not find the resource id from the result: ${resource_result}"
    exit 1
  fi

  echo "Getting permissions"
  for resource_id in $resource_ids ; do
    curl -s -X POST "$KEYCLOAK_URL" "$INSECURE" \
      -H "Content-Type: application/x-www-form-urlencoded" \
      -H "Authorization: Basic $BACKEND_BASIC_AUTH" \
      -d "audience=${BACKEND_CLIENT_ID}" \
      --data-urlencode "grant_type=urn:ietf:params:oauth:grant-type:uma-ticket" \
      -d "permission=${resource_id}" \
      -d "subject_token=${backend_token}" \
      | jq .
  done
else
  echo "Failed auth result: $result"
fi