# Setting up Dropbox Integration

This guide explains how to set up the Dropbox integration for DocuElevate.

## Required Configuration Parameters

| **Variable**            | **Description**                                  |
|-------------------------|--------------------------------------------------|
| `DROPBOX_APP_KEY`       | Dropbox API app key                              |
| `DROPBOX_APP_SECRET`    | Dropbox API app secret                           |
| `DROPBOX_REFRESH_TOKEN` | OAuth2 refresh token for Dropbox                 |
| `DROPBOX_FOLDER`        | Default folder path for Dropbox uploads          |

For a complete list of configuration options, see the [Configuration Guide](ConfigurationGuide.md).

## Setup Methods

DocuElevate supports two distinct Dropbox OAuth flows:

1. **Per-User Integration Wizard (Recommended for end users)**: Triggered from the Integrations dashboard (`/integrations`) by clicking **Authorize** on a Dropbox destination or Dropbox-backed Watch Folder. Credentials are saved securely to your personal integration record — global settings are never exposed.
2. **System-Level Setup Wizard**: Available at `/dropbox-setup` for administrators configuring the global system-wide Dropbox connection. Generates environment variables for all worker nodes.
3. **Manual Setup**: Following the step-by-step instructions in this document.

## Per-User OAuth Flow (Integrations Dashboard)

End users authorize their own Dropbox integration from the **Integrations** dashboard:

1. Navigate to `/integrations` and click **+ Add Destination** (or **+ Add Source** for Watch Folder).
2. Create a Dropbox destination integration (or a Watch Folder with `source_type = dropbox`).
3. Click the **Authorize** button next to the integration — it links directly to the OAuth wizard pre-loaded with your integration's configuration.
4. If the administrator has configured system-wide Dropbox app credentials (`DROPBOX_APP_KEY` / `DROPBOX_APP_SECRET`), the wizard defaults to using them — no need to register your own Dropbox app. Uncheck the toggle to use custom credentials if needed.
5. Click **Start Authentication Flow**, authorize access in Dropbox, and the refresh token is automatically saved to your personal integration record.
6. After authorization, an interactive **folder browser** lets you select the target folder directly from your Dropbox — no need to manually type folder paths.
7. The page redirects to `/integrations` on success. Re-authorization is available at any time via the **Re-Authorize** button.

> **Note:** Your credentials are stored encrypted per-integration and are never mixed with other users' data. Each user can have multiple Dropbox integrations with independent tokens.

## Using the System-Level Setup Wizard (Admin)

The easiest way to configure the global Dropbox integration is to use the built-in setup wizard:

1. Navigate to the `/dropbox-setup` page in your DocuElevate instance.
2. Follow the on-screen instructions to create a Dropbox app.
3. Enter your App Key and App Secret in the wizard.
4. Optionally specify a custom folder path for uploads.
5. Click **Start Authentication Flow** to begin the authorization process.
6. Complete the Dropbox authentication process.
7. The system will automatically exchange the authorization code for a refresh token.
8. Copy the generated environment variables for your worker nodes.

The wizard handles all the token exchange steps and provides you with the exact configuration needed for your environment.

## Step-by-Step Manual Setup Instructions

### 1. Create a Dropbox App

1. Go to the [Dropbox Developer Apps Console](https://www.dropbox.com/developers/apps)
2. Click "Create app"
3. Select "Scoped access" for API
4. Choose "Full Dropbox" access (or "App folder" for more restricted access)
5. Give your app a name (e.g., "DocuElevate")
6. Click "Create app"

### 2. Configure App Permissions

1. In your app's settings page, go to the "Permissions" tab
2. Enable the following permissions:
   - `files.content.write` (to upload files)
   - `files.content.read` (if you need to read file content)
3. Click "Submit" to save changes

### 3. Get App Key and Secret

1. On your app's settings page, find the "App key" and "App secret"
2. Set these as `DROPBOX_APP_KEY` and `DROPBOX_APP_SECRET` in your configuration

### 4. Generate a Refresh Token

1. Go to the "OAuth 2" tab in your app settings
2. Add a redirect URI: `http://localhost` (this is for the authorization flow)
3. Generate an authorization URL with these instructions:

   ```
   https://www.dropbox.com/oauth2/authorize?client_id=YOUR_APP_KEY&response_type=code&token_access_type=offline
   ```

4. Replace `YOUR_APP_KEY` with your app key
5. Open this URL in your browser
6. Authorize the app when prompted
7. You'll be redirected to `localhost` with a code parameter in the URL
8. Copy this code parameter

### 5. Exchange the Code for a Refresh Token

1. Use this curl command to exchange the code for tokens:

   ```bash
   curl -X POST https://api.dropboxapi.com/oauth2/token \
     -d code=YOUR_AUTH_CODE \
     -d grant_type=authorization_code \
     -d client_id=YOUR_APP_KEY \
     -d client_secret=YOUR_APP_SECRET \
     -d redirect_uri=http://localhost
   ```

2. From the response, copy the `refresh_token` value

### 6. Configure DocuElevate

1. Set `DROPBOX_APP_KEY`, `DROPBOX_APP_SECRET`, and `DROPBOX_REFRESH_TOKEN` with your values
2. Set `DROPBOX_FOLDER` to the path where files should be uploaded (e.g., `/Documents/Uploads`)

## Token Management

The system will use the refresh token to automatically generate short-lived access tokens when needed. Refresh tokens typically don't expire unless revoked.

### Testing Your Token

You can test if your token is working correctly:

1. Navigate to the `/dropbox-setup` page in your DocuElevate instance
2. Click the "Test Token" button to verify your credentials
3. If the test fails, click "Refresh Token" to obtain a new refresh token

## Troubleshooting

If you encounter issues with Dropbox integration:

1. **Authentication Errors**: Make sure your App Key and App Secret are correct
2. **Token Expired**: Click "Refresh Token" button on the setup page to obtain a new token
3. **Folder Permissions**: Ensure your app has the correct permissions enabled for file operations
4. **Invalid Redirect URI**: See section below for the most common cause and fix.
5. **Rate Limiting**: Dropbox API has rate limits; if exceeded, wait and try again

### Fixing "Invalid redirect_uri" Error

This error appears on the Dropbox authorization page when the redirect URI in the OAuth request does not match any URI registered in your Dropbox app console.

**Most common cause**: The application is deployed behind a reverse proxy (Traefik, Nginx, Caddy) that does **not** forward the `X-Forwarded-Proto: https` header to DocuElevate. Without this header, the server cannot determine that it is being accessed over HTTPS and may construct an `http://` redirect URI, while the registered URI in Dropbox is `https://`.

**Fix**:

Option 1 – Configure your proxy to forward `X-Forwarded-Proto`:

```nginx
proxy_set_header X-Forwarded-Proto $scheme;
```

Option 2 – Set `PUBLIC_BASE_URL` in your environment (recommended for most deployments):

```bash
PUBLIC_BASE_URL=https://docuelevate.example.com
```

When `PUBLIC_BASE_URL` is set, DocuElevate uses it directly for all OAuth redirect URIs instead of trying to infer the scheme from request headers. This is the most reliable option.

After setting `PUBLIC_BASE_URL`, ensure the Dropbox app console redirect URI matches exactly (e.g., `https://docuelevate.example.com/dropbox-callback`). The setup wizard at `/dropbox-setup` will show you the exact URI to register.

For more general configuration issues, see the [Configuration Troubleshooting Guide](ConfigurationTroubleshooting.md).
