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feat: add token script #19
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| #!/usr/bin/env bash | ||
| # | ||
| # Copyright (c) 2026 Metaform Systems, Inc. | ||
| # | ||
| # This program and the accompanying materials are made available under the | ||
| # terms of the Apache License, Version 2.0 which is available at | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # SPDX-License-Identifier: Apache-2.0 | ||
| # | ||
| # Contributors: | ||
| # Metaform Systems, Inc. - initial API and implementation | ||
| # | ||
| # | ||
|
|
||
| # | ||
| # Mint a Kubernetes SA token, exchange it (RFC 8693) at the IDP, print the | ||
| # resulting access token to stdout. | ||
| # | ||
| # Usage: | ||
| # KUBE_SA=my-sa KUBE_NS=my-ns KUBE_AUDIENCE=<idp-subject-audience> \ | ||
| # IDP_TOKEN_ENDPOINT=https://idp.example.com/oauth2/token \ | ||
| # IDP_AUDIENCE=<audience-the-ingress-expects> \ | ||
| # ./get-access-token.sh | ||
| # | ||
| # # capture it: | ||
| # TOKEN="$(./get-access-token.sh)" | ||
| # curl -H "Authorization: Bearer $TOKEN" https://your-ingress/... | ||
| # | ||
| set -euo pipefail | ||
|
|
||
| # ---- config (override via env) ------------------------------------------- | ||
| : "${KUBE_SA:=redline}" | ||
| : "${KUBE_NS:=edc-v}" | ||
| : "${KUBE_AUDIENCE:=https://kubernetes.default.svc.cluster.local}" # audience the IDP expects on the subject token | ||
| : "${KUBE_TOKEN_DURATION:=1800s}" | ||
|
|
||
| : "${IDP_TOKEN_ENDPOINT:=http://jad.localhost/api/auth/token}" | ||
| : "${IDP_AUDIENCE:=edcv}" # audience the ingress expects | ||
| : "${IDP_SCOPE:=admin cfm-write cfm-read read write}" | ||
|
|
||
| # ---- 1. mint the SA subject token ---------------------------------------- | ||
| kubectl_args=(create token "$KUBE_SA" -n "$KUBE_NS" --duration "$KUBE_TOKEN_DURATION") | ||
| if [ -n "$KUBE_AUDIENCE" ]; then kubectl_args+=(--audience "$KUBE_AUDIENCE"); fi | ||
|
|
||
| SUBJECT_TOKEN="$(kubectl "${kubectl_args[@]}")" | ||
|
|
||
| # ---- 2. RFC 8693 token exchange ------------------------------------------ | ||
| curl_args=( | ||
| --silent --show-error --fail-with-body | ||
| --request POST "$IDP_TOKEN_ENDPOINT" | ||
| --header "Content-Type: application/x-www-form-urlencoded" | ||
| --data-urlencode "grant_type=urn:ietf:params:oauth:grant-type:token-exchange" | ||
| --data-urlencode "subject_token=${SUBJECT_TOKEN}" | ||
| --data-urlencode "subject_token_type=urn:ietf:params:oauth:token-type:jwt" | ||
| --data-urlencode "resource=redline" | ||
| --data-urlencode "audience=${IDP_AUDIENCE}" | ||
| --data-urlencode "scope=${IDP_SCOPE}" | ||
| ) | ||
|
|
||
| RESPONSE="$(curl "${curl_args[@]}")" | ||
|
|
||
| # ---- 3. extract + print access_token ------------------------------------- | ||
| ACCESS_TOKEN="$(printf '%s' "$RESPONSE" | jq -r '.access_token // empty')" | ||
|
|
||
| if [ -z "$ACCESS_TOKEN" ]; then | ||
| echo "error: no access_token in IDP response:" >&2 | ||
| printf '%s\n' "$RESPONSE" >&2 | ||
| exit 1 | ||
| fi | ||
|
|
||
| printf '%s\n' "$ACCESS_TOKEN" | ||
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