1 package static
2
3 import (
4 "net/http"
5 "os"
6 "path"
7 "strings"
8
9 "github.com/gin-gonic/gin"
10 )
11
12 const INDEX = "index.html"
13
14 type ServeFileSystem interface {
15 http.FileSystem
16 Exists(prefix string, path string) bool
17 }
18
19 type localFileSystem struct {
20 http.FileSystem
21 root string
22 indexes bool
23 }
24
25 func LocalFile(root string, indexes bool) *localFileSystem {
26 return &localFileSystem{
27 FileSystem: gin.Dir(root, indexes),
28 root: root,
29 indexes: indexes,
30 }
31 }
32
33 func (l *localFileSystem) Exists(prefix string, filepath string) bool {
34 if p := strings.TrimPrefix(filepath, prefix); len(p) < len(filepath) {
35 name := path.Join(l.root, p)
36 stats, err := os.Stat(name)
37 if err != nil {
38 return false
39 }
40 if stats.IsDir() {
41 if !l.indexes {
42 index := path.Join(name, INDEX)
43 _, err := os.Stat(index)
44 if err != nil {
45 return false
46 }
47 }
48 }
49 return true
50 }
51 return false
52 }
53
54 func ServeRoot(urlPrefix, root string) gin.HandlerFunc {
55 return Serve(urlPrefix, LocalFile(root, false))
56 }
57
58
59 func Serve(urlPrefix string, fs ServeFileSystem) gin.HandlerFunc {
60 fileserver := http.FileServer(fs)
61 if urlPrefix != "" {
62 fileserver = http.StripPrefix(urlPrefix, fileserver)
63 }
64 return func(c *gin.Context) {
65 if fs.Exists(urlPrefix, c.Request.URL.Path) {
66 fileserver.ServeHTTP(c.Writer, c.Request)
67 c.Abort()
68 }
69 }
70 }
71
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