# Environment Variables

Complete reference for all environment variables consumed by AgentIdP.

Variables are loaded from a `.env` file at startup via `dotenv`. In production, inject them directly into the process environment — do not commit `.env` to version control.

---

## Required Variables

These variables must be set. The server will throw and exit immediately if any are missing.

### `DATABASE_URL`

PostgreSQL connection string.

| | |
|-|-|
| **Required** | Yes |
| **Format** | `postgresql://<user>:<password>@<host>:<port>/<database>` |
| **Example** | `postgresql://sentryagent:sentryagent@localhost:5432/sentryagent_idp` |

The application uses `pg.Pool` with this connection string. Connection pool size uses the `pg` default (10 connections).

---

### `REDIS_URL`

Redis connection URL.

| | |
|-|-|
| **Required** | Yes |
| **Format** | `redis://<host>:<port>` or `redis://<user>:<password>@<host>:<port>` |
| **Example** | `redis://localhost:6379` |

Used for token revocation, rate limiting, and monthly token counters.

---

### `JWT_PRIVATE_KEY`

PEM-encoded RSA-2048 private key for signing JWT access tokens (RS256).

| | |
|-|-|
| **Required** | Yes |
| **Format** | PEM string, including `-----BEGIN RSA PRIVATE KEY-----` header and footer |
| **Example** | See [Security guide](security.md) for key generation |

In a `.env` file, use double quotes and encode newlines as `\n`:

```
JWT_PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----\nMIIEow...\n-----END RSA PRIVATE KEY-----"
```

Alternatively, read from a file at startup (see [Security guide](security.md)).

---

### `JWT_PUBLIC_KEY`

PEM-encoded RSA-2048 public key for verifying JWT access tokens.

| | |
|-|-|
| **Required** | Yes |
| **Format** | PEM string, including `-----BEGIN PUBLIC KEY-----` header and footer |
| **Example** | Derived from `JWT_PRIVATE_KEY` — see [Security guide](security.md) |

Every authenticated request verifies the JWT signature using this key. If this key does not match the private key used to sign tokens, all authentication will fail.

---

## Optional Variables

These variables have defaults and do not need to be set for local development.

### `VAULT_ADDR`

HashiCorp Vault server address. **Required to enable Vault integration (Phase 2).**

| | |
|-|-|
| **Required** | No (Vault is optional) |
| **Format** | URL string |
| **Example** | `VAULT_ADDR=http://127.0.0.1:8200` |

When set alongside `VAULT_TOKEN`, new credentials are stored in Vault KV v2 instead of as bcrypt hashes in PostgreSQL. Existing bcrypt credentials continue to work unchanged until rotated. See [Vault setup guide](vault-setup.md).

---

### `VAULT_TOKEN`

Vault authentication token. Required when `VAULT_ADDR` is set.

| | |
|-|-|
| **Required** | Only when `VAULT_ADDR` is set |
| **Format** | String |
| **Example** | `VAULT_TOKEN=hvs.XXXXXXXXXXXXXXXXXXXXXX` |

Use a Vault service token scoped to `read`, `write`, and `delete` on `{VAULT_MOUNT}/data/agentidp/*` and `{VAULT_MOUNT}/metadata/agentidp/*`.

---

### `VAULT_MOUNT`

KV v2 secrets engine mount path.

| | |
|-|-|
| **Required** | No |
| **Default** | `secret` |
| **Format** | String (no leading or trailing slash) |
| **Example** | `VAULT_MOUNT=agentidp` |

---

### `POLICY_DIR`

Directory containing OPA policy files (`authz.rego`, `authz.wasm`, `data/scopes.json`).

| | |
|-|-|
| **Required** | No |
| **Default** | `<cwd>/policies` |
| **Format** | Absolute or relative directory path |
| **Example** | `POLICY_DIR=/etc/sentryagent/policies` |

At startup the OPA authorization middleware loads `${POLICY_DIR}/authz.wasm` (Wasm mode) if present; otherwise it loads `${POLICY_DIR}/data/scopes.json` (fallback mode). Send `SIGHUP` to the process to hot-reload the policy files without a restart.

---

### `PORT`

HTTP port the Express server listens on.

| | |
|-|-|
| **Required** | No |
| **Default** | `3000` |
| **Format** | Integer |
| **Example** | `PORT=8080` |

---

### `NODE_ENV`

Node.js environment flag.

| | |
|-|-|
| **Required** | No |
| **Default** | `undefined` (treated as development) |
| **Values** | `development`, `test`, `production` |
| **Example** | `NODE_ENV=production` |

Effect: When `NODE_ENV=test`, HTTP request logging (Morgan) is disabled.

---

### `CORS_ORIGIN`

Allowed origin(s) for Cross-Origin Resource Sharing.

| | |
|-|-|
| **Required** | No |
| **Default** | `*` (all origins) |
| **Format** | URL string or `*` |
| **Example** | `CORS_ORIGIN=https://app.mycompany.ai` |

In production, set this to the specific origin(s) that should be permitted to call the API. The default `*` is acceptable for a public API but restricts cookie-based auth flows (not applicable here — Bearer tokens only).

---

## Complete `.env` Example

```
# Database
DATABASE_URL=postgresql://sentryagent:sentryagent@localhost:5432/sentryagent_idp

# Redis
REDIS_URL=redis://localhost:6379

# Application
PORT=3000
NODE_ENV=development
CORS_ORIGIN=*

# JWT Keys (generate with openssl — see docs/devops/security.md)
JWT_PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----
MIIEowIBAAKCAQEA...
-----END RSA PRIVATE KEY-----"

JWT_PUBLIC_KEY="-----BEGIN PUBLIC KEY-----
MIIBIjANBgkq...
-----END PUBLIC KEY-----"

# HashiCorp Vault (Phase 2 — optional, omit to use bcrypt mode)
# VAULT_ADDR=http://127.0.0.1:8200
# VAULT_TOKEN=hvs.XXXXXXXXXXXXXXXXXXXXXX
# VAULT_MOUNT=secret

# OPA Policy Engine (Phase 2 — optional, defaults to <cwd>/policies)
# POLICY_DIR=/etc/sentryagent/policies
```

> Do not commit `.env` to version control. Add it to `.gitignore`.

---

## Variable Validation at Startup

The application validates required variables at startup in this order:

1. `JWT_PRIVATE_KEY` and `JWT_PUBLIC_KEY` — checked in `createApp()` before the server starts
2. `DATABASE_URL` — checked when `getPool()` is first called (during `createApp()`)
3. `REDIS_URL` — checked when `getRedisClient()` is first called (during `createApp()`)

If any required variable is missing, the process exits with an error before binding to any port.