#!/usr/bin/env bash
# init_oauth2_proxy.sh
#
# Bootstrap the oauth2-proxy gate in front of Supabase Studio at
# db.0.knoe.dev. Gates access via Google Workspace OIDC (knoey.com) so any
# @knoey.com identity (chrisfu, ron) can sign in and share the Studio
# session. Outside-domain users are rejected at this layer.
#
# Usage:
#   ./etc/init_oauth2_proxy.sh
#
# Env vars (resolved from etc/secrets/* if not set in the shell):
#   OAUTH2_PROXY_CLIENT_ID      ← from etc/secrets/oauth2-proxy-client-id
#   OAUTH2_PROXY_CLIENT_SECRET  ← from etc/secrets/oauth2-proxy-client-secret
#   OAUTH2_PROXY_COOKIE_SECRET  ← from etc/secrets/oauth2-proxy-cookie-secret
#
# Optional:
#   APP_CLUSTER_KUBECONTEXT     (default: $KUBECONTEXT then ambient)
#   NAMESPACE                   (default: supabase)
#
# Pre-reqs:
#   - OAuth 2.0 client created at GCP Console (see the secret template
#     deploy/gcp/gke/oauth2-proxy-google-oidc-secret.example.yaml for the
#     exact authorized redirect URI + consent screen settings).
#   - cookie_secret generated with: openssl rand -base64 32
#   - Three values saved into etc/secrets/oauth2-proxy-{client-id,client-secret,cookie-secret}
#     (chmod 0600 each; etc/secrets/ is gitignored except for .keep).
#
# After this script runs and the oauth2-proxy Deployment is Ready, two
# manual steps complete the wiring (NOT done by this script — see the plan
# in docs/plans/ for the full sequence):
#
#   1. Patch the supabase-kong Ingress to route db.0.knoe.dev through
#      oauth2-proxy:80 instead of supabase-kong:8000:
#
#        kubectl --context=$APP_CLUSTER_KUBECONTEXT -n supabase patch ingress \
#          supabase-kong --type=json -p '[
#            {"op": "replace",
#             "path": "/spec/rules/1/http/paths/0/backend/service/name",
#             "value": "oauth2-proxy"},
#            {"op": "replace",
#             "path": "/spec/rules/1/http/paths/0/backend/service/port/number",
#             "value": 80}
#          ]'
#      (verify the index by checking which rule has host=db.0.knoe.dev first;
#       index may shift on future Helm reconciles)
#
#   2. Remove the basic-auth plugin from the dashboard route in the
#      supabase-kong configmap (oauth2-proxy is the gate now; double-auth is
#      friction). Then rollout-restart supabase-kong.
#
# When knoe-auth Round 1 ships an OIDC OP at https://api.knoe.dev/auth, change
# `--provider=google` to `--provider=oidc --oidc-issuer-url=https://api.knoe.dev/auth`
# in deploy/gcp/gke/oauth2-proxy-deployment.yaml and re-run this script.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
GKE_MANIFEST_DIR="$REPO_ROOT/deploy/gcp/gke"

NAMESPACE="${NAMESPACE:-supabase}"
KCTX="${APP_CLUSTER_KUBECONTEXT:-${KUBECONTEXT:-}}"

if [[ -n "$KCTX" ]]; then
  KCTX_FLAG=(--context="$KCTX")
else
  KCTX_FLAG=()
fi

log() { printf "[%s] %s\n" "$(date +%H:%M:%S)" "$*"; }
die() { log "ERROR: $*" >&2; exit 1; }

resolve_secret() {
  # Resolve a value from env (preferred) or etc/secrets/<file>.
  local var="$1" file="$2" val="${!1:-}"
  if [[ -z "$val" && -f "$REPO_ROOT/etc/secrets/$file" ]]; then
    val="$(cat "$REPO_ROOT/etc/secrets/$file")"
  fi
  if [[ -z "$val" ]]; then
    die "missing $var (set the env var, or save the value into etc/secrets/$file)"
  fi
  printf '%s' "$val"
}

for tool in kubectl envsubst; do
  command -v "$tool" >/dev/null 2>&1 || die "required tool not found: $tool"
done

OAUTH2_PROXY_CLIENT_ID="$(resolve_secret OAUTH2_PROXY_CLIENT_ID oauth2-proxy-client-id)"
OAUTH2_PROXY_CLIENT_SECRET="$(resolve_secret OAUTH2_PROXY_CLIENT_SECRET oauth2-proxy-client-secret)"
OAUTH2_PROXY_COOKIE_SECRET="$(resolve_secret OAUTH2_PROXY_COOKIE_SECRET oauth2-proxy-cookie-secret)"
export OAUTH2_PROXY_CLIENT_ID OAUTH2_PROXY_CLIENT_SECRET OAUTH2_PROXY_COOKIE_SECRET

SECRET_TMPL="$GKE_MANIFEST_DIR/oauth2-proxy-google-oidc-secret.example.yaml"
DEPLOY_MANIFEST="$GKE_MANIFEST_DIR/oauth2-proxy-deployment.yaml"

[[ -f "$SECRET_TMPL"     ]] || die "missing manifest: $SECRET_TMPL"
[[ -f "$DEPLOY_MANIFEST" ]] || die "missing manifest: $DEPLOY_MANIFEST"

log "==> oauth2-proxy bootstrap"
log "    namespace : $NAMESPACE"
log "    kubectx   : ${KCTX:-<ambient>}"

log "Applying oauth2-proxy-google-oidc secret ..."
envsubst '${OAUTH2_PROXY_CLIENT_ID} ${OAUTH2_PROXY_CLIENT_SECRET} ${OAUTH2_PROXY_COOKIE_SECRET}' \
  < "$SECRET_TMPL" \
  | kubectl "${KCTX_FLAG[@]}" -n "$NAMESPACE" apply -f -

log "Applying oauth2-proxy ServiceAccount + BackendConfig + Service + Deployment ..."
kubectl "${KCTX_FLAG[@]}" -n "$NAMESPACE" apply -f "$DEPLOY_MANIFEST"

log "Waiting for oauth2-proxy Deployment to become Ready (timeout 180s) ..."
kubectl "${KCTX_FLAG[@]}" -n "$NAMESPACE" rollout status deployment/oauth2-proxy --timeout=180s

log "==> oauth2-proxy bootstrap complete."
echo ""
echo "  Next steps (NOT performed by this script):"
echo "    1. Patch the supabase-kong Ingress so db.0.knoe.dev routes to"
echo "       oauth2-proxy:80 instead of supabase-kong:8000."
echo "    2. Remove the basic-auth plugin from the dashboard route in the"
echo "       supabase-kong configmap, then rollout-restart supabase-kong."
echo "    3. In a browser, sign in to https://db.0.knoe.dev/ with a"
echo "       @knoey.com Google account. Try a non-knoey account too — should"
echo "       receive 403 from oauth2-proxy."
echo ""
echo "  See the active plan in ~/.claude/plans/ for the exact patch commands."