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Plugins documentation

When you find yourself needing something that's not available by default, plugins helps you make things happen. The scope of plugins is large and extend the features provided by Filestash's core.

Plugin Marketplace

  • plg_backend_backblaze{:rel="nofollow"}: Integration with the Blackblaze B2 cloud storage service

  • plg_backend_dav{:rel="nofollow"}: Integration with CalDAV and CardDAV servers

  • plg_backend_ldap{:rel="nofollow"}: Integration with an LDAP server

  • plg_backend_mysql{:rel="nofollow"}: Integration with a Mysql database

  • plg_handler_console{:rel="nofollow"}: a fully-fledged tty console which makes it to maintain your instance when SSH access is blocked (screenshot{:rel="nofollow"})

  • plg_image_light{:rel="nofollow"}: Handles image transcoding and resizing.

  • plg_security_scanner{:rel="nofollow"}: Handles non legitimate traffic from scanners with a bunch of tricks that are picked at random: gzip bomb, XML bomb, redirection to the attacker's own IP, redirection to localhost, sendout of HTTP headers that don't match with the content that was send and other fun stuff

  • plg_security_svg{:rel="nofollow"}: this plugin handles the security aspect of SVG images (by default, SVG images could be crafted to execute javascript or break the browser with an XML bomb). Has 2 modes that can be configured from the admin console: mitigation mode where SVG images are allowed but filtered to remove potential harms and blocking mode where SVG images are simply blocked

  • plg_starter_http{:rel="nofollow"}: serve an application via HTTP. This plugin is the legacy server that was used until May 2019

  • plg_starter_http2{:rel="nofollow"}: same as plg_starter_http but with an HTTP2 server

  • plg_started_https{:rel="nofollow"}: same as plg_starter_http but with an HTTPS server.

  • plg_starter_tor{:rel="nofollow"}: same as plg_starter_http but the server is expose on TOR with an onion URL

  • plg_starter_tunnel{:rel="nofollow"}: this is the default server that's used since May 2019

  • add you own with a PR

Anatomy of a Filestash plugin

Plugins are developed using the Go programming language. Those are listed in this file{:rel="nofollow"} before getting compiled (see our guide{:rel="nofollow"} to make a build)

Internally, plugins have a few key parts:

  • an entry point which will be called when Filestash boots up. The entry point of a plugin is its init function
  • they can call a series of hooks and APIs to perform their duties (see here{:rel="nofollow"})

Basic example

package main

import (
	. ""

func init() {
    plugin_enable := Config.Get("features.nothing.enable").Default(true).Bool()

    Hooks.Register.ProcessFileContentBeforeSend(func(reader io.ReadCloser, ctx *App, res *http.ResponseWriter, req *http.Request) (io.ReadCloser, error){
        if plugin_enable {
            Log.Info("Can do something here: %v", plugin_enable)
        return reader, nil

Configuration management

A Plugin can query and/or mutate the configuration state using the global Config object. The resulting configuration can be seen and updated from the admin UI (/admin/configure).

Usage Example:

// mutate the configuration state
var testConfig0 string = Config.Get("general.test").Default("test").String()

// same as above except that the admin console will be more user friendly
var testConfig1 string = Config.Get("general.test").Schema(func(f *FormElement) *FormElement {
	if f == nil {
		f = &FormElement{}
    f.Description = "This is the description a user will see in the admin console"
	f.Name = "test"
	f.Type = "text"
    f.Default = "test"
    f.Placeholder = "Input placeholder"

Development Hints

  • The list of available hooks is defined there{:rel="nofollow"}. Those will be extended when a need is identified, pull requests are welcome.
  • Backends are registered like this{:rel="nofollow"} and need to implement this interface{:rel="nofollow"}
  • There's a range of middlewares available for reusable logic (things like managing access, permissions and sessions, etc.), reuse them as you see fit (see examples{:rel="nofollow"})