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vygrant - oauth2 token manager daemon for legacy and cli applications

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# vygrant

**OAuth2 Authentication Daemon for Legacy Applications**

`vygrant` provides a local CLI and background daemon for managing OAuth2 tokens on legacy applications that lack modern authentication support.

## Features

- **Daemon + CLI**: Manage and refresh tokens through a local Unix socket.
- **Secure token handling**: Tokens are stored securely in memory and optionally persisted.
- **Auto-refresh & notifications**: Optional background token refresh with notification support on Linux/macOS/Windows.

## Installation

### Arch Linux

You can install `vygrant` from the AUR using an AUR helper like `yay` or `paru`:

```bash
yay -S vygrant
# or
paru -S vygrant
```

Else you can install it manually using `git` and `makepkg`:

```bash
git clone https://aur.archlinux.org/vygrant.git
cd vygrant
makepkg -si
```

### Manual

```bash
git clone https://github.com/vybraan/vygrant.git
cd vygrant
go build  -ldflags "-s -w"
```

## Getting Started

### 1. Initialize Configuration

Create a default configuration file:

```bash
vygrant init
```

This generates a config at `~/.config/vybr/vygrant.toml`. Open and edit the file to register your OAuth2 accounts:

```toml
https_listen = "8443"
http_listen = ""
persist_tokens = true

[account.myapp]
auth_uri = "https://provider.com/auth"
token_uri = "https://provider.com/token"
client_id = "YOUR_CLIENT_ID"
client_secret = "YOUR_CLIENT_SECRET"
redirect_uri = "https://localhost:8443"
scopes = ["openid", "profile", "email"]
```

#### Optional Settings

- `https_listen`: Port for HTTPS callbacks (default `8080`).
- `http_listen`: Port for HTTP callbacks (default disabled). Use this with `redirect_uri = "http://localhost:<port>"` if your browser blocks the self-signed HTTPS callback.
- `persist_tokens`: Whether to persist refresh tokens (default `true`). When enabled, vygrant prefers the OS keyring; access tokens stay in memory.
- `token_event_cmd`: Optional shell command to run whenever tokens change (set/delete/restore). `VYGRANT_ACCOUNT` and `VYGRANT_EVENT` are exported.

#### Token persistence and migration

- If a legacy `~/.vybr/vygrant/tokens.json` exists and the keyring is available, vygrant migrates refresh tokens to the keyring on first run and renames the old file to `tokens.json.bak`.
- If the keyring is unavailable but a legacy `tokens.json` exists, vygrant uses that file store with a warning (legacy compatibility).
- If the keyring is unavailable and no legacy file exists, tokens are memory‑only and will be lost on daemon restart.
- If the keyring is unavailable and `pass` is installed, vygrant uses `pass` as the refresh-token store (access tokens remain in memory).

#### Exporting and restoring tokens (advanced)

You can export the current token state and re-import it later:

```bash
vygrant token dump > tokens.json
cat tokens.json | vygrant token restore
```

The dump contains secrets; store it encrypted (e.g., `age`, `gpg`). When `token_event_cmd` is set, you can automate this export on changes.

###### You may use Thunderbird's OAuth2 client ID/secret for Microsoft accounts, but it's recommended to create your own credentials.

### 2. Start the Daemon

Ensure the config exists, then run:

```bash
vygrant server
```

The daemon will listen for OAuth2 callbacks and manage the tokens.

#### Trusting the local certificate (one-time)

Vygrant generates a local CA and a `localhost` certificate on first run. To avoid browser warnings for HTTPS callbacks, import and trust the CA certificate once:

- Use the built-in command: `vygrant trust` (add `--system` for system trust where supported).
- CA certificate path: `~/.vybr/vygrant/certs/vygrant_ca.pem`
 - To remove trust later, run: `vygrant untrust` (add `--system` for system trust).

If you reinstall on another machine, a new CA is generated and should be trusted again.

### 3. Authenticate via CLI

Use the CLI to initiate authentication in your browser:

```bash
vygrant token refresh myapp
```

After approval in the browser, you'll see a friendly success page. You can then close the tab and vygrant handles everything in the background.

## CLI Commands Overview

- `vygrant accounts` - list all configured accounts.
- `vygrant status` - display authentication status (valid, expired, missing).
- `vygrant info` - show daemon config details (socket path, ports, etc.).
- `vygrant token get <account>` - retrieve access token.
- `vygrant token delete <account>` - remove a stored token.
- `vygrant token refresh <account>` - perform OAuth authentication flow (opens browser).

## Example usage with msmtp

```
account example@hotmail.com
host smtp-mail.outlook.com
port 587
from example@hotmail.com
user example@hotmail.com
passwordeval "vygrant token get myapp"
auth on
tls on
tls_trust_file	/etc/ssl/certs/ca-certificates.crt
tls_starttls
```

## Alternatives
vygrant is very simple. You may also consider these
programs as alternatives:

* [Pizauth](https://github.com/ltratt/pizauth)
* [Email OAuth 2.0 Proxy](https://github.com/simonrob/email-oauth2-proxy)
* [mailctl](https://github.com/pdobsan/mailctl)
* [mutt_oauth2.py](https://gitlab.com/muttmua/mutt/-/blob/master/contrib/mutt_oauth2.py)
* [oauth-helper-office-365](https://github.com/ahrex/oauth-helper-office-365)

## Contributing & License

Contributions are welcome! Please fork, submit pull requests, or file issues for enhancements or bug fixes.

_vygrant_ is released under the MIT License.

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