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static.go
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static.go
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package static
import (
"net/http"
"os"
"path"
"strings"
"github.com/gin-gonic/gin"
)
type ServeFileSystem interface {
http.FileSystem
Exists(prefix string, path string) bool
}
type localFileSystem struct {
http.FileSystem
root string
indexes bool
}
func LocalFile(root string, indexes bool) *localFileSystem {
return &localFileSystem{
FileSystem: gin.Dir(root, indexes),
root: root,
indexes: indexes,
}
}
func (l *localFileSystem) Exists(prefix string, filepath string) bool {
if p := strings.TrimPrefix(filepath, prefix); len(p) < len(filepath) {
name := path.Join(l.root, p)
stats, err := os.Stat(name)
if err != nil {
return false
}
if !l.indexes && stats.IsDir() {
return false
}
return true
}
return false
}
func ServeRoot(urlPrefix, root string) gin.HandlerFunc {
return Serve(urlPrefix, LocalFile(root, false))
}
// Static returns a middleware handler that serves static files in the given directory.
func Serve(urlPrefix string, fs ServeFileSystem) gin.HandlerFunc {
fileserver := http.FileServer(fs)
if urlPrefix != "" {
fileserver = http.StripPrefix(urlPrefix, fileserver)
}
return func(c *gin.Context) {
if fs.Exists(urlPrefix, c.Request.URL.Path) {
fileserver.ServeHTTP(c.Writer, c.Request)
c.Abort()
}
}
}