qnap: Add REST API documentation

Author: lcruz99

clis/teliod/QNAP.md

@@ -0,0 +1,127 @@
+# QNAP Build
+
+To build Teliod package for QNAP devices there are two alternatives:
+
+- Run cargo build directly:
+```cargo build --verbose --target x86_64-unknown-linux-musl --package teliod --features qnap``` 
+
+- Run build script [Recommended]:
+```../../ci/build_libtelio.py build qnap x86_64 [--debug]```
+
+The build script has an additional stage at the end of the build where it creates the QNAP package.
+
+## REST API
+
+This REST API allows interaction with the Teliod daemon. It provides endpoints for managing the daemon, updating its configuration, and retrieving logs and status information.
+
+### Endpoints
+
+#### 1. **Start the Daemon**
+- **Endpoint**: `/`
+- **Method**: `POST`
+- **Description**: Starts the Teliod Daemon in the background.
+- **Request Body**: None
+- **Responses**:
+  - **200 OK**: Daemon started successfully.
+  - **400 Bad Request**: Daemon is already running.
+  - **500 Internal Server Error**: Failed to start the daemon.
+
+#### 2. **Stop the Daemon**
+- **Endpoint**: `/`
+- **Method**: `DELETE`
+- **Description**: Stops the running Teliod Daemon.
+- **Request Body**: None
+- **Responses**:
+  - **200 OK**: Daemon stopped successfully.
+  - **400 Bad Request**: Daemon is not running.
+  - **500 Internal Server Error**: Failed to stop the daemon.
+
+#### 3. **Update Configuration**
+- **Endpoint**: `/`
+- **Method**: `PATCH`
+- **Description**: Updates the daemon configuration with provided settings.
+- **Request Body**: JSON object containing the configuration updates. Only specified fields will be updated; others remain unchanged.
+- **Example Request Body**:
+  ```json
+  {
+    "log_level": "info",
+    "log_file_path": "/new/path/to/log.log"
+  }
+  ```
+  - **Responses**:
+  - **200 OK**: Configuration updated successfully
+  - **400 Bad Request**: Invalid JSON payload or configuration fields.
+  - **500 Internal Server Error**: Failed to update configuration.
+
+#### 4. **Get Meshnet Status**
+- **Endpoint**: `/?info=get-status`
+- **Method**: `GET`
+- **Description**: Retrieves the current status of the Meshnet from Teliod daemon.
+- **Request Body**: None
+- **Responses**:
+  - **200 OK**: Status information in JSON format.
+    ```json
+    {
+        "telio_is_running": true,
+        "meshnet_ip": null,
+        "external_nodes": []
+        ...
+    }
+    ```
+  - **500 Internal Server Error**: Failed to retrieve status.
+
+#### 5. **Get Meshnet Logs**
+- **Endpoint**: `/?info=get-meshnet-logs`
+- **Method**: `GET`
+- **Description**: Retrieves the latest logs of the Meshnet.
+- **Request Body**: None
+- **Responses**:
+  - **200 OK**: Log content in JSON format.
+    ```json
+    {
+        "Log line 1\nLog line 2\nLog line 3\n..."
+    }
+    ```
+  - **404 Not Found**: Log file not found.
+
+#### 6. **Get Teliod Logs**
+- **Endpoint**: `/?info=get-teliod-logs`
+- **Method**: `GET`
+- **Description**: Retrieves the latest logs of the Teliod Daemon.
+- **Request Body**: None
+- **Responses**:
+  - **200 OK**: Log content in JSON format.
+    ```json
+    {
+        "Log line 1\nLog line 2\nLog line 3\n..."
+    }
+    ```
+  - **404 Not Found**: Log file not found.
+
+### Error Handling
+
+For all endpoints, the following error codes may be returned:
+- **400 Bad Request**: The request was malformed or invalid.
+- **500 Internal Server Error**: An unexpected error occurred while processing the request.
+
+### Example usage with curl
+
+#### Start Teliod daemon:
+```bash
+curl -X POST http://<NAS-IP>:8080/
+```
+
+#### Stop Teliod daemon:
+```bash
+curl -X POST http://<NAS-IP>:8080/
+```
+
+#### Get Meshnet logs:
+```bash
+curl -X GET "http://<NAS-IP>:8080/?info=get-meshnet-logs"
+```
+
+#### Update Config:
+```bash
+curl -X PATCH -H "Content-Type: application/json" -d '{"log_level":"info", authentication_token": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"}' http://<NAS-IP>:8080/cgi-bin/qpkg/teliod.cgi
+```