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sftpgo-plugin-pubsub

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Publish/Subscribe systems integration for SFTPGo

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# SFTPGo Pub/Sub plugin

![Build](https://github.com/sftpgo/sftpgo-plugin-pubsub/workflows/Build/badge.svg)
[![License: AGPL v3](https://img.shields.io/badge/License-AGPLv3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)

This plugin allows to send [SFTPGo](https://github.com/drakkan/sftpgo/) filesystem and provider events to publish/subscribe systems. It is not meant to react to `pre-*` events. It simply forwards the configured events to an external pub/sub system.

## Configuration

The supported services can be configured within the `plugins` section of the SFTPGo configuration file: you have to set the service publish URL as first plugin argument. You can also set an, optional, instance id by passing a second argument. The instance id is useful if you are receiving notifications from multiple SFTPGo instances and want to identify where the events are coming from.

This is an example configuration.

```json
...
"plugins": [
    {
      "type": "notifier",
      "notifier_options": {
        "fs_events": [
          "download",
          "upload"
        ],
        "provider_events": [
          "add",
          "delete"
        ],
        "provider_objects": [
          "user",
          "admin",
          "api_key"
        ],
        "retry_max_time": 60,
        "retry_queue_max_size": 1000
      },
      "cmd": "<path to sftpgo-plugin-pubsub>",
      "args": ["rabbit://sftpgo"],
      "sha256sum": "",
      "auto_mtls": true
    }
  ]
...
```

With the above example the plugin is configured to connect to [RabbitMQ](https://www.rabbitmq.com/) and publish messages to the `sftpgo` fanout exchange. The RabbitMQ’s server is discovered from the `RABBIT_SERVER_URL` environment variable (which is something like `amqp://guest:guest@localhost:5672/`).

The plugin will not start if it fails to connect to the configured service, this will prevent SFTPGo from starting.

The plugin will panic if an error occurs while publishing an event, for example because the service connection is lost. SFTPGo will automatically restart it and you can configure SFTPGo to retry failed events until they are older than a configurable time (60 seconds in the above example). This way no event is lost.

## Notifications format

The filesystem events will contain a JSON serialized struct in the message body with the following fields:

- `timestamp`, string formatted as RFC3339 with nanoseconds precision
- `action`, string, an SFTPGo supported action
- `username`
- `fs_path`, string filesystem path
- `fs_target_path`, string, included for `rename` action and `sftpgo-copy` SSH command
- `virtual_path`, string, path seen by SFTPGo users
- `virtual_target_path`, string, target path seen by SFTPGo users
- `ssh_cmd`, string, included for `ssh_cmd` action
- `file_size`, integer, included for `pre-upload`, `upload`, `download`, `delete` actions if the file size is greater than `0`
- `elapsed`, integer. Elapsed time as milliseconds
- `status`, integer. 1 means no error, 2 means a generic error occurred, 3 means quota exceeded error
- `protocol`, string. Possible values are `SSH`, `SFTP`, `SCP`, `FTP`, `DAV`, `HTTP`, `HTTPShare`, `DataRetention`, `OIDC`, `EventAction`
- `ip`, string. The action was executed from this IP address
- `session_id`, string. Unique protocol session identifier. For stateless protocols such as HTTP the session id will change for each request
- `fs_provider`, int. Filesystem provider `0` for local filesystem, `1` for S3 backend, `2` for Google Cloud Storage (GCS) backend, `3` for Azure Blob Storage backend, `4` for local encrypted backend, `5` for SFTP backend
- `bucket`, string. Non-empty for S3, GCS and Azure backends
- `endpoint`, string. Non-empty for S3, SFTP and Azure backend if configured
- `open_flags`, integer. File open flags, can be non-zero for `pre-upload` action. If `file_size` is greater than zero and `open_flags&512 == 0` the target file will not be truncated
- `role`, string. Included if the user who executed the action has a role
- `metadata`, struct
- `instance_id`, string. Included if you pass an instance id as the second CLI parameter

The `action` is also added as metadata.

The provider events will contain a JSON serialized struct in the message body with the following fields:

- `timestamp`, string formatted as RFC3339 with nanoseconds precision
- `action`, string, an SFTPGo supported action
- `username`, string, the username that executed the action. There are two special usernames: `__self__` identifies a user/admin that updates itself and `__system__` identifies an action that does not have an explicit executor associated with it, for example users/admins can be added/updated by loading them from initial data
- `ip`, string. The action was executed from this IP address
- `object_type`, string. Afftected object type, for example `user`, `admin`, `api_key`
- `object_name`, string. Unique identifier for the affected object, for example username or key id
- `object_data`, base64 of the JSON serialized object with sensitive fields removed
- `role`, string. Included if the admin/user who executed the action has a role
- `instance_id`, string. Included if you pass an instance id as the second CLI parameter

The `action` and the `object_type`are also added as metadata.

The log events will contain a JSON serialized struct in the message body with the following fields:

- `timestamp`, string formatted as RFC3339 with nanoseconds precision
- `event`, integer, a supported log event type
- `protocol`, string. Possible values are `SSH`, `SFTP`, `SCP`, `FTP`, `DAV`, `HTTP`, `HTTPShare`, `DataRetention`, `OIDC`, `EventAction`
- `username`, string
- `ip`, string
- `message`, string. Log message
- `role`, string. Included if the admin/user who executed the action has a role
- `instance_id`, string. Included if you pass an instance id as the second CLI parameter

The metadata `action` is set to `log` and `event` contains the string representation of the log `event`.

## Supported services

We use [Go CDK](https://gocloud.dev/howto/pubsub/) to access several publish/subscribe systems in a portable way.

### Google Cloud Pub/Sub

To publish events to a [Google Cloud Pub/Sub](https://cloud.google.com/pubsub/docs/) topic, you have to use `gcppubsub` as URL scheme and you have to include the project ID and the topic ID within the URL, for example `gcppubsub://projects/myproject/topics/mytopic`.

This plugin will use Application Default Credentials. See [here](https://cloud.google.com/docs/authentication/production) for alternatives such as environment variables.

### Amazon Simple Notification Service

To publish events to an Amazon [Simple Notification Service](https://aws.amazon.com/sns/) (SNS) topic, you have to use `awssns` as URL scheme. The topic is identified via the Amazon Resource Name (ARN). You should specify the region query parameter to ensure your application connects to the correct region.

Here is a sample URL: `awssns:///arn:aws:sns:us-east-2:123456789012:mytopic?region=us-east-2`.

The plugin will create a default AWS Session with the `SharedConfigEnable` option enabled. See [AWS Session](https://docs.aws.amazon.com/sdk-for-go/api/aws/session/) to learn about authentication alternatives, including using environment variables.

### Amazon Simple Queue Service

To publish events to an Amazon [Simple Queue Service](https://aws.amazon.com/sqs/) (SQS) topic, you have to use an URL that closely resemble the queue URL, except the leading `https://` is replaced with `awssqs://`. You can specify the region query parameter to ensure your application connects to the correct region.

Here is a sample URL: `awssqs://sqs.us-east-2.amazonaws.com/123456789012/myqueue?region=us-east-2`.

### Azure Service Bus

To publish to an [Azure Service Bus](https://azure.microsoft.com/en-us/services/service-bus/) topic over [AMQP 1.0](https://www.amqp.org/), you have to use `azuresb` as URL scheme and the topic name as URL host.

Here is a sample URL: `azuresb://mytopic`.

We use the environment variable `SERVICEBUS_CONNECTION_STRING` to obtain the Service Bus connection string. The connection string can be obtained [from the Azure portal](https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dotnet-how-to-use-topics-subscriptions#get-the-connection-string).

### RabbitMQ

To publish events to an [AMQP 0.9.1](https://www.rabbitmq.com/protocol.html) fanout exchange, the dialect of AMQP spoken by [RabbitMQ](https://www.rabbitmq.com/), you have to use `rabbit` as URL scheme and the exchange name as URL host.

Here is a sample URL: `rabbit://myexchange`.

The RabbitMQ’s server is discovered from the `RABBIT_SERVER_URL` environment variable (which is something like `amqp://guest:guest@localhost:5672/`).

### NATS

To publish events to a [NATS](https://nats.io/) subject, you have to use `nats` as URL scheme and the subject name as URL host.

Here is a sample URL: `nats://example.mysubject`.

The NATS server is discovered from the `NATS_SERVER_URL` environment variable (which is something like `nats://nats.example.com`).

### Kafka

To publish events to a [Kafka](https://kafka.apache.org/) cluster, you have to use `kafka` as URL scheme and the topic name as URL host.

Here is a sample URL: `kafka://my-topic`.

The brokers in the Kafka cluster are discovered from the `KAFKA_BROKERS` environment variable (which is a comma-delimited list of hosts, something like `1.2.3.4:9092,5.6.7.8:9092`).

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