fiber/docs/api/middleware/filesystem.md

id
filesystem

FileSystem

Filesystem middleware for Fiber that enables you to serve files from a directory.

:::caution :params & :optionals? within the prefix path are not supported!

To handle paths with spaces (or other url encoded values) make sure to set fiber.Config{ UnescapePath: true } :::

Signatures

func New(config Config) fiber.Handler

Examples

Import the middleware package that is part of the Fiber web framework

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/filesystem"
)

After you initiate your Fiber app, you can use the following possibilities:

// Provide a minimal config
app.Use(filesystem.New(filesystem.Config{
	Root: http.Dir("./assets"),
}))

// Or extend your config for customization
app.Use(filesystem.New(filesystem.Config{
    Root:         http.Dir("./assets"),
    Browse:       true,
    Index:        "index.html",
    NotFoundFile: "404.html",
    MaxAge:       3600,
}))

If your environment (Go 1.16+) supports it, we recommend using Go Embed instead of the other solutions listed as this one is native to Go and the easiest to use.

embed

Embed is the native method to embed files in a Golang excecutable. Introduced in Go 1.16.

package main

import (
	"embed"
	"io/fs"
	"log"
	"net/http"

	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/filesystem"
)

// Embed a single file
//go:embed index.html
var f embed.FS

// Embed a directory
//go:embed static/*
var embedDirStatic embed.FS

func main() {
	app := fiber.New()

	app.Use("/", filesystem.New(filesystem.Config{
		Root: http.FS(f),
	}))

	// Access file "image.png" under `static/` directory via URL: `http://<server>/static/image.png`.
	// Without `PathPrefix`, you have to access it via URL:
	// `http://<server>/static/static/image.png`.
	app.Use("/static", filesystem.New(filesystem.Config{
		Root: http.FS(embedDirStatic),
		PathPrefix: "static",
		Browse: true,
	}))

	log.Fatal(app.Listen(":3000"))
}

pkger

https://github.com/markbates/pkger

package main

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/filesystem"

    "github.com/markbates/pkger"
)

func main() {
    app := fiber.New()

    app.Use("/assets", filesystem.New(filesystem.Config{
        Root: pkger.Dir("/assets"),
	}))

    log.Fatal(app.Listen(":3000"))
}

packr

https://github.com/gobuffalo/packr

package main

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/filesystem"

    "github.com/gobuffalo/packr/v2"
)

func main() {
    app := fiber.New()

    app.Use("/assets", filesystem.New(filesystem.Config{
        Root: packr.New("Assets Box", "/assets"),
	}))

    log.Fatal(app.Listen(":3000"))
}

go.rice

https://github.com/GeertJohan/go.rice

package main

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/filesystem"

    "github.com/GeertJohan/go.rice"
)

func main() {
    app := fiber.New()

    app.Use("/assets", filesystem.New(filesystem.Config{
        Root: rice.MustFindBox("assets").HTTPBox(),
	}))

    log.Fatal(app.Listen(":3000"))
}

fileb0x

https://github.com/UnnoTed/fileb0x

package main

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/filesystem"

    "<Your go module>/myEmbeddedFiles"
)

func main() {
    app := fiber.New()

    app.Use("/assets", filesystem.New(filesystem.Config{
        Root: myEmbeddedFiles.HTTP,
	}))

    log.Fatal(app.Listen(":3000"))
}

statik

https://github.com/rakyll/statik

package main

import (
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/filesystem"

	// Use blank to invoke init function and register data to statik
	_ "<Your go module>/statik" 
	"github.com/rakyll/statik/fs"
)

func main() {
	statikFS, err := fs.New()
	if err != nil {
		panic(err)
	}

	app := fiber.New()

	app.Use("/", filesystem.New(filesystem.Config{
		Root: statikFS,
	}))

	log.Fatal(app.Listen(":3000"))
}

Config

Property	Type	Description	Default
Next	func(*fiber.Ctx) bool	Next defines a function to skip this middleware when returned true.	nil
Root	http.FileSystem	Root is a FileSystem that provides access to a collection of files and directories.	nil
PathPrefix	string	PathPrefix defines a prefix to be added to a filepath when reading a file from the FileSystem.	""
Browse	bool	Enable directory browsing.	false
Index	string	Index file for serving a directory.	"index.html"
MaxAge	int	The value for the Cache-Control HTTP-header that is set on the file response. MaxAge is defined in seconds.	0
NotFoundFile	string	File to return if the path is not found. Useful for SPA's.	""
ContentTypeCharset	string	The value for the Content-Type HTTP-header that is set on the file response.	""

Default Config

var ConfigDefault = Config{
    Next:   nil,
    Root:   nil,
    PathPrefix: "",
    Browse: false,
    Index:  "/index.html",
    MaxAge: 0,
    ContentTypeCharset: "",
}