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filesystem.go
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filesystem.go
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package filesystem
import (
"net/http"
"os"
"strings"
"sync"
"github.com/gofiber/fiber/v2"
)
// Config defines the config for middleware.
type Config struct {
// Next defines a function to skip this middleware when returned true.
//
// Optional. Default: nil
Next func(c *fiber.Ctx) bool
// Root is a FileSystem that provides access
// to a collection of files and directories.
//
// Required. Default: nil
Root http.FileSystem
// Index file for serving a directory.
//
// Optional. Default: "index.html"
Index string
// Enable directory browsing.
//
// Optional. Default: false
Browse bool
// File to return if path is not found. Useful for SPA's.
//
// Optional. Default: ""
NotFoundFile string
}
// ConfigDefault is the default config
var ConfigDefault = Config{
Next: nil,
Root: nil,
Index: "/index.html",
Browse: false,
}
// New creates a new middleware handler
func New(config ...Config) fiber.Handler {
// Set default config
cfg := ConfigDefault
// Override config if provided
if len(config) > 0 {
cfg = config[0]
// Set default values
if cfg.Index == "" {
cfg.Index = ConfigDefault.Index
}
if !strings.HasPrefix(cfg.Index, "/") {
cfg.Index = "/" + cfg.Index
}
if cfg.NotFoundFile != "" && !strings.HasPrefix(cfg.NotFoundFile, "/") {
cfg.NotFoundFile = "/" + cfg.NotFoundFile
}
}
if cfg.Root == nil {
panic("filesystem: Root cannot be nil")
}
var once sync.Once
var prefix string
// Return new handler
return func(c *fiber.Ctx) (err error) {
// Don't execute middleware if Next returns true
if cfg.Next != nil && cfg.Next(c) {
return c.Next()
}
method := c.Method()
// We only serve static assets on GET or HEAD methods
if method != fiber.MethodGet && method != fiber.MethodHead {
return c.Next()
}
// Set prefix once
once.Do(func() {
prefix = c.Route().Path
})
// Strip prefix
path := strings.TrimPrefix(c.Path(), prefix)
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
var (
file http.File
stat os.FileInfo
)
file, err = cfg.Root.Open(path)
if err != nil && os.IsNotExist(err) && cfg.NotFoundFile != "" {
file, err = cfg.Root.Open(cfg.NotFoundFile)
}
if err != nil {
if os.IsNotExist(err) {
return c.Status(fiber.StatusNotFound).Next()
}
return
}
if stat, err = file.Stat(); err != nil {
return
}
// Serve index if path is directory
if stat.IsDir() {
indexPath := strings.TrimSuffix(path, "/") + cfg.Index
index, err := cfg.Root.Open(indexPath)
if err == nil {
indexStat, err := index.Stat()
if err == nil {
file = index
stat = indexStat
}
}
}
// Browse directory if no index found and browsing is enabled
if stat.IsDir() {
if cfg.Browse {
return dirList(c, file)
}
return fiber.ErrForbidden
}
modTime := stat.ModTime()
contentLength := int(stat.Size())
// Set Content Type header
c.Type(getFileExtension(stat.Name()))
// Set Last Modified header
if !modTime.IsZero() {
c.Set(fiber.HeaderLastModified, modTime.UTC().Format(http.TimeFormat))
}
if method == fiber.MethodGet {
c.Response().SetBodyStream(file, contentLength)
return nil
}
if method == fiber.MethodHead {
c.Request().ResetBody()
// Fasthttp should skipbody by default if HEAD?
c.Response().SkipBody = true
c.Response().Header.SetContentLength(contentLength)
if err := file.Close(); err != nil {
return err
}
return nil
}
return c.Next()
}
}