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https://github.com/garrytan/gstack.git
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Garry Tan
3f2dca1aaa
Two-path authentication: enter 6-digit code in terminal OR click magic link in email. Races both paths — whichever completes first wins. Saves JWT to ~/.gstack/auth-token.json with auto-refresh. Includes status and logout subcommands. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
276 lines
9.1 KiB
Bash
Executable File
276 lines
9.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# gstack-auth — authenticate with Supabase via email OTP + magic link
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#
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# Usage:
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# gstack-auth [email] — start auth flow (prompts if no email)
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# gstack-auth status — show current auth status
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# gstack-auth logout — remove saved tokens
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#
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# Two-path authentication:
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# 1. OTP: user enters 6-digit code from email in terminal
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# 2. Magic link: user clicks link → redirects to local server
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# Whichever completes first wins.
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#
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# Env overrides (for testing):
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# GSTACK_STATE_DIR — override ~/.gstack state directory
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# GSTACK_DIR — override auto-detected gstack root
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set -euo pipefail
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GSTACK_DIR="${GSTACK_DIR:-$(cd "$(dirname "$0")/.." && pwd)}"
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STATE_DIR="${GSTACK_STATE_DIR:-$HOME/.gstack}"
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AUTH_FILE="$STATE_DIR/auth-token.json"
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# Source Supabase config
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if [ -f "$GSTACK_DIR/supabase/config.sh" ]; then
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. "$GSTACK_DIR/supabase/config.sh"
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fi
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SUPABASE_URL="${GSTACK_SUPABASE_URL:-}"
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ANON_KEY="${GSTACK_SUPABASE_ANON_KEY:-}"
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if [ -z "$SUPABASE_URL" ] || [ -z "$ANON_KEY" ]; then
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echo "Error: Supabase not configured. Check supabase/config.sh"
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exit 1
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fi
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AUTH_URL="${SUPABASE_URL}/auth/v1"
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# ─── Helper: write auth token file ──────────────────────────
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save_token() {
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local access_token="$1"
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local refresh_token="$2"
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local expires_in="$3"
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local email="$4"
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local user_id="$5"
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local expires_at
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expires_at=$(( $(date +%s) + expires_in ))
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mkdir -p "$STATE_DIR"
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cat > "$AUTH_FILE" <<TOKJSON
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{
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"access_token": "${access_token}",
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"refresh_token": "${refresh_token}",
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"expires_at": ${expires_at},
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"email": "${email}",
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"user_id": "${user_id}"
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}
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TOKJSON
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chmod 600 "$AUTH_FILE"
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}
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# ─── Helper: extract JSON field (portable, no jq dependency) ─
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json_field() {
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local json="$1"
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local field="$2"
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echo "$json" | grep -o "\"${field}\":[^,}]*" | head -1 | sed "s/\"${field}\"://;s/\"//g;s/ //g"
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}
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# ─── Helper: clean up background processes ───────────────────
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cleanup() {
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# Kill the local server if running
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[ -n "${SERVER_PID:-}" ] && kill "$SERVER_PID" 2>/dev/null || true
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# Remove temp files
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[ -n "${CALLBACK_FILE:-}" ] && rm -f "$CALLBACK_FILE" 2>/dev/null || true
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[ -n "${RESPONSE_FILE:-}" ] && rm -f "$RESPONSE_FILE" 2>/dev/null || true
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}
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trap cleanup EXIT
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# ─── Subcommand: status ─────────────────────────────────────
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if [ "${1:-}" = "status" ]; then
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if [ ! -f "$AUTH_FILE" ]; then
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echo "Not authenticated. Run: gstack auth <email>"
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exit 0
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fi
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AUTH_JSON="$(cat "$AUTH_FILE")"
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EMAIL="$(json_field "$AUTH_JSON" "email")"
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EXPIRES_AT="$(json_field "$AUTH_JSON" "expires_at")"
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NOW="$(date +%s)"
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if [ "$NOW" -lt "$EXPIRES_AT" ] 2>/dev/null; then
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REMAINING=$(( (EXPIRES_AT - NOW) / 60 ))
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echo "Authenticated as: $EMAIL"
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echo "Token expires in: ${REMAINING}m"
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else
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echo "Authenticated as: $EMAIL (token expired — will auto-refresh)"
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fi
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exit 0
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fi
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# ─── Subcommand: logout ─────────────────────────────────────
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if [ "${1:-}" = "logout" ]; then
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rm -f "$AUTH_FILE"
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echo "Logged out. Auth token removed."
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exit 0
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fi
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# ─── Main: auth flow ────────────────────────────────────────
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EMAIL="${1:-}"
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if [ -z "$EMAIL" ]; then
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printf "Enter your email: "
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read -r EMAIL
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fi
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if [ -z "$EMAIL" ]; then
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echo "Error: email is required"
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exit 1
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fi
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# Validate email format (basic check)
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if ! echo "$EMAIL" | grep -qE '^[^@]+@[^@]+\.[^@]+$'; then
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echo "Error: invalid email format"
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exit 1
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fi
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# ─── Find a free port for magic link callback ────────────────
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find_free_port() {
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# Try to find a free port using Python (available on macOS)
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python3 -c 'import socket; s=socket.socket(); s.bind(("",0)); print(s.getsockname()[1]); s.close()' 2>/dev/null || echo "0"
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}
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CALLBACK_PORT="$(find_free_port)"
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CALLBACK_URL="http://localhost:${CALLBACK_PORT}/callback"
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CALLBACK_FILE="$(mktemp)"
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RESPONSE_FILE="$(mktemp)"
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# ─── Step 1: Send OTP (also sends magic link) ────────────────
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echo ""
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echo "Sending verification email to ${EMAIL}..."
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# If we got a valid port, include redirect URL for magic link
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OTP_BODY="{\"email\":\"${EMAIL}\"}"
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if [ "$CALLBACK_PORT" != "0" ]; then
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OTP_BODY="{\"email\":\"${EMAIL}\",\"options\":{\"emailRedirectTo\":\"${CALLBACK_URL}\"}}"
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fi
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HTTP_RESPONSE="$(curl -s -w "\n%{http_code}" \
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-X POST "${AUTH_URL}/otp" \
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-H "Content-Type: application/json" \
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-H "apikey: ${ANON_KEY}" \
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-d "$OTP_BODY" 2>/dev/null || echo -e "\n000")"
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HTTP_BODY="$(echo "$HTTP_RESPONSE" | head -n -1)"
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HTTP_CODE="$(echo "$HTTP_RESPONSE" | tail -1)"
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case "$HTTP_CODE" in
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2*)
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;; # success
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429)
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echo "Rate limited — please wait 60 seconds and try again."
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exit 1
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;;
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*)
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echo "Error sending OTP (HTTP ${HTTP_CODE}): ${HTTP_BODY}"
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exit 1
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;;
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esac
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echo ""
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echo "Check your email! Two ways to authenticate:"
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echo " 1. Enter the 6-digit code below"
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if [ "$CALLBACK_PORT" != "0" ]; then
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echo " 2. Or click the magic link in the email"
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fi
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echo ""
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# ─── Step 2: Start local server for magic link (background) ──
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if [ "$CALLBACK_PORT" != "0" ]; then
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# Start a simple HTTP listener that captures the callback
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(
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# Use nc to listen for one connection
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while true; do
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REQUEST="$(echo -e "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<html><body><h2>gstack authenticated!</h2><p>You can close this tab.</p></body></html>" | nc -l "$CALLBACK_PORT" 2>/dev/null || true)"
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if echo "$REQUEST" | grep -q "GET /callback"; then
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# Extract token_hash or access_token from query params
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QUERY="$(echo "$REQUEST" | grep "GET /callback" | sed 's/GET \/callback?//' | awk '{print $1}')"
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echo "$QUERY" > "$CALLBACK_FILE"
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break
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fi
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done
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) &
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SERVER_PID=$!
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fi
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# ─── Step 3: Race OTP input vs magic link callback ───────────
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printf "Enter code: "
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# Read with 5-minute timeout
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OTP_CODE=""
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if read -r -t 300 OTP_CODE 2>/dev/null; then
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: # Got OTP code from terminal
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fi
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# Check if magic link callback arrived while we waited
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MAGIC_LINK_TOKEN=""
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if [ -f "$CALLBACK_FILE" ] && [ -s "$CALLBACK_FILE" ]; then
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CALLBACK_DATA="$(cat "$CALLBACK_FILE")"
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# Extract access_token from URL params
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MAGIC_LINK_TOKEN="$(echo "$CALLBACK_DATA" | grep -o 'access_token=[^&]*' | sed 's/access_token=//' || true)"
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fi
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# ─── Step 4: Verify (OTP path or magic link path) ────────────
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if [ -n "$MAGIC_LINK_TOKEN" ]; then
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# Magic link path — token already obtained
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echo ""
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echo "Magic link authenticated!"
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# Get user info from the token
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USER_RESPONSE="$(curl -s \
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-H "Authorization: Bearer ${MAGIC_LINK_TOKEN}" \
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-H "apikey: ${ANON_KEY}" \
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"${AUTH_URL}/user" 2>/dev/null || echo "{}")"
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USER_ID="$(json_field "$USER_RESPONSE" "id")"
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# Extract refresh_token from callback params
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REFRESH_TOKEN="$(echo "$CALLBACK_DATA" | grep -o 'refresh_token=[^&]*' | sed 's/refresh_token=//' || true)"
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EXPIRES_IN="$(echo "$CALLBACK_DATA" | grep -o 'expires_in=[^&]*' | sed 's/expires_in=//' || echo "3600")"
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save_token "$MAGIC_LINK_TOKEN" "$REFRESH_TOKEN" "$EXPIRES_IN" "$EMAIL" "$USER_ID"
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elif [ -n "$OTP_CODE" ]; then
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# OTP path — verify the code
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OTP_CODE="$(echo "$OTP_CODE" | tr -d '[:space:]')"
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if ! echo "$OTP_CODE" | grep -qE '^[0-9]{6}$'; then
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echo "Error: code must be exactly 6 digits"
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exit 1
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fi
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VERIFY_RESPONSE="$(curl -s \
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-X POST "${AUTH_URL}/verify" \
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-H "Content-Type: application/json" \
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-H "apikey: ${ANON_KEY}" \
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-d "{\"email\":\"${EMAIL}\",\"token\":\"${OTP_CODE}\",\"type\":\"email\"}" \
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2>/dev/null || echo "{}")"
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ACCESS_TOKEN="$(json_field "$VERIFY_RESPONSE" "access_token")"
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REFRESH_TOKEN="$(json_field "$VERIFY_RESPONSE" "refresh_token")"
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EXPIRES_IN="$(json_field "$VERIFY_RESPONSE" "expires_in")"
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USER_ID="$(json_field "$VERIFY_RESPONSE" "id" 2>/dev/null || true)"
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# Try to get user_id from nested user object if not at top level
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if [ -z "$USER_ID" ]; then
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USER_ID="$(echo "$VERIFY_RESPONSE" | grep -o '"id":"[^"]*"' | head -1 | sed 's/"id":"//;s/"//')"
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fi
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if [ -z "$ACCESS_TOKEN" ] || [ "$ACCESS_TOKEN" = "null" ]; then
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ERROR_MSG="$(json_field "$VERIFY_RESPONSE" "error_description" 2>/dev/null || json_field "$VERIFY_RESPONSE" "msg" 2>/dev/null || echo "unknown error")"
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echo ""
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echo "Verification failed: $ERROR_MSG"
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echo "Check the code and try again."
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exit 1
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fi
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save_token "$ACCESS_TOKEN" "$REFRESH_TOKEN" "${EXPIRES_IN:-3600}" "$EMAIL" "$USER_ID"
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else
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echo ""
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echo "Timed out — no code entered and magic link not clicked."
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exit 1
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fi
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# ─── Step 5: Save email to config ────────────────────────────
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"$GSTACK_DIR/bin/gstack-config" set email "$EMAIL"
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echo ""
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echo "Authenticated as: ${EMAIL}"
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echo "Token saved to: ${AUTH_FILE}"
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