# Custom Actions

The `actions` struct inside the "common" configuration section allows to configure the actions for file operations and SSH commands.
The `hook` can be defined as the absolute path of your program or an HTTP URL.

The `upload` condition includes both uploads to new files and overwrite of existing files. If an upload is aborted for quota limits SFTPGo tries to remove the partial file, so if the notification reports a zero size file and a quota exceeded error the file has been deleted. The `ssh_cmd` condition will be triggered after a command is successfully executed via SSH. `scp` will trigger the `download` and `upload` conditions and not `ssh_cmd`.
The notification will indicate if an error is detected and so, for example, a partial file is uploaded.
The `pre-delete` action, if defined, will be called just before files deletion. If the external command completes with a zero exit status or the HTTP notification response code is `200` then SFTPGo will assume that the file was already deleted/moved and so it will not try to remove the file and it will not execute the hook defined for the `delete` action.

If the `hook` defines a path to an external program, then this program is invoked with the following arguments:

- `action`, string, possible values are: `download`, `upload`, `pre-delete`,`delete`, `rename`, `ssh_cmd`
- `username`
- `path` is the full filesystem path, can be empty for some ssh commands
- `target_path`, non-empty for `rename` action and for `sftpgo-copy` SSH command
- `ssh_cmd`, non-empty for `ssh_cmd` action

The external program can also read the following environment variables:

- `SFTPGO_ACTION`
- `SFTPGO_ACTION_USERNAME`
- `SFTPGO_ACTION_PATH`
- `SFTPGO_ACTION_TARGET`, non-empty for `rename` `SFTPGO_ACTION`
- `SFTPGO_ACTION_SSH_CMD`, non-empty for `ssh_cmd` `SFTPGO_ACTION`
- `SFTPGO_ACTION_FILE_SIZE`, non-empty for `upload`, `download` and `delete` `SFTPGO_ACTION`
- `SFTPGO_ACTION_FS_PROVIDER`, `0` for local filesystem, `1` for S3 backend, `2` for Google Cloud Storage (GCS) backend, `3` for Azure Blob Storage backend
- `SFTPGO_ACTION_BUCKET`, non-empty for S3, GCS and Azure backends
- `SFTPGO_ACTION_ENDPOINT`, non-empty for S3 and Azure backend if configured. For Azure this is the SAS URL, if configured otherwise the endpoint
- `SFTPGO_ACTION_STATUS`, integer. 0 means a generic error occurred. 1 means no error, 2 means quota exceeded error
- `SFTPGO_ACTION_PROTOCOL`, string. Possible values are `SSH`, `SFTP`, `SCP`, `FTP`, `DAV`

Previous global environment variables aren't cleared when the script is called.
The program must finish within 30 seconds.

If the `hook` defines an HTTP URL then this URL will be invoked as HTTP POST. The request body will contain a JSON serialized struct with the following fields:

- `action`
- `username`
- `path`
- `target_path`, not null for `rename` action
- `ssh_cmd`, not null for `ssh_cmd` action
- `file_size`, not null for `upload`, `download`, `delete` actions
- `fs_provider`, `0` for local filesystem, `1` for S3 backend, `2` for Google Cloud Storage (GCS) backend, `3` for Azure Blob Storage backend
- `bucket`, not null for S3, GCS and Azure backends
- `endpoint`, not null for S3 and Azure backend if configured. For Azure this is the SAS URL, if configured otherwise the endpoint
- `status`, integer. 0 means a generic error occurred. 1 means no error, 2 means quota exceeded error
- `protocol`, string. Possible values are `SSH`, `FTP`, `DAV`

The HTTP hook will use the global configuration for HTTP clients and will respect the retry configurations.

The `actions` struct inside the "data_provider" configuration section allows you to configure actions on user add, update, delete.

Actions will not be fired for internal updates, such as the last login or the user quota fields, or after external authentication.

If the `hook` defines a path to an external program, then this program is invoked with the following arguments:

- `action`, string, possible values are: `add`, `update`, `delete`
- `username`
- `ID`
- `status`
- `expiration_date`
- `home_dir`
- `uid`
- `gid`

The external program can also read the following environment variables:

- `SFTPGO_USER_ACTION`
- `SFTPGO_USER`, user serialized as JSON with sensitive fields removed

Previous global environment variables aren't cleared when the script is called.
The program must finish within 15 seconds.

If the `hook` defines an HTTP URL then this URL will be invoked as HTTP POST. The action is added to the query string, for example `<hook>?action=update`, and the user is sent serialized as JSON inside the POST body with sensitive fields removed.

The HTTP hook will use the global configuration for HTTP clients and will respect the retry configurations.