/
static.go
253 lines (237 loc) · 5.92 KB
/
static.go
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package middleware
import (
"html/template"
"net/http"
"os"
"path"
"path/filepath"
"time"
"github.com/admpub/log"
"github.com/webx-top/echo"
)
var ListDirTemplate = `<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>{{.file}}</title>
<meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible" />
<meta content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" name="viewport" />
<link href="/favicon.ico" rel="shortcut icon">
</head>
<body>
<ul id="fileList">
{{range $k, $d := .dirs}}
<li><a href="{{$d.Name}}{{if $d.IsDir}}/{{end}}" style="color: {{if $d.IsDir}}#e91e63{{else}}#212121{{end}};">{{$d.Name}}{{if $d.IsDir}}/{{end}}</a></li>
{{end}}
</ul>
</body>
</html>`
type (
StaticOptions struct {
// Skipper defines a function to skip middleware.
Skipper echo.Skipper `json:"-"`
Path string `json:"path"` //UrlPath
Root string `json:"root"`
Fallback []string `json:"fallback"`
Index string `json:"index"`
Browse bool `json:"browse"`
Template string `json:"template"`
Debug bool `json:"debug"`
FS http.FileSystem `json:"-"`
MaxAge time.Duration `json:"maxAge"`
open func(string) (http.File, error)
render func(echo.Context, interface{}) error
}
)
func Static(options ...*StaticOptions) echo.MiddlewareFunc {
// Default options
opts := new(StaticOptions)
if len(options) > 0 {
opts = options[0]
}
return opts.Init().Middleware()
}
func (s *StaticOptions) Init() *StaticOptions {
if s.Skipper == nil {
s.Skipper = echo.DefaultSkipper
}
var err error
s.Root, err = filepath.Abs(s.Root)
if err != nil {
panic(err)
}
for index, fallback := range s.Fallback {
s.Fallback[index], err = filepath.Abs(fallback)
if err != nil {
panic(err)
}
if s.Debug {
log.GetLogger("echo").Debug(`[middleware][static] `, `Register assets directory: `, fallback)
}
}
if len(s.Path) > 0 && s.Path[0] != '/' {
s.Path = `/` + s.Path
}
if s.Debug {
log.GetLogger("echo").Debug(`[middleware][static] `, `Static: `, s.Path, "\t-> ", s.Root)
}
return s
}
func (s *StaticOptions) AddFallback(fallback string) *StaticOptions {
var err error
fallback, err = filepath.Abs(fallback)
if err != nil {
panic(err)
}
s.Fallback = append(s.Fallback, fallback)
if s.Debug {
log.GetLogger("echo").Debug(`[middleware][static] `, `Register assets directory: `, fallback)
}
return s
}
func (s *StaticOptions) getOpener() func(file string) (http.File, error) {
if s.open != nil {
return s.open
}
if s.FS != nil {
s.open = s.FS.Open
} else {
s.open = func(name string) (http.File, error) {
fp, err := os.Open(name)
return fp, err
}
}
return s.open
}
func (s *StaticOptions) getRender() func(c echo.Context, data interface{}) error {
if s.render != nil {
return s.render
}
if !s.Browse {
return nil
}
if len(s.Template) > 0 {
s.render = func(c echo.Context, data interface{}) error {
return c.Render(s.Template, data)
}
} else {
t := template.New(s.Template)
_, err := t.Parse(ListDirTemplate)
if err != nil {
panic(err)
}
s.render = func(c echo.Context, data interface{}) error {
w := c.Response()
w.Header().Set(echo.HeaderContentType, echo.MIMETextHTMLCharsetUTF8)
return t.Execute(w, data)
}
}
return s.render
}
func (s *StaticOptions) findFile(c echo.Context, root string, hasIndex bool, file string, render func(echo.Context, interface{}) error, opener func(string) (http.File, error)) error {
absFile := root
if len(file) > 0 {
absFile = filepath.Join(root, file)
}
fp, err := opener(absFile)
if err != nil {
return echo.ErrNotFound
}
defer fp.Close()
fi, err := fp.Stat()
if err != nil {
return echo.ErrNotFound
}
if fi.IsDir() {
if hasIndex {
fp.Close()
// Index file
indexFile := filepath.Join(absFile, s.Index)
fp, err = opener(indexFile)
if err != nil {
return echo.ErrNotFound
}
fi, err = fp.Stat()
if err != nil || fi.IsDir() {
if s.Browse {
return listDirByCustomFS(absFile, file, c, render, opener)
}
return echo.ErrNotFound
}
} else {
if s.Browse {
return listDirByCustomFS(absFile, file, c, render, opener)
}
return echo.ErrNotFound
}
}
return c.ServeContent(fp, fi.Name(), fi.ModTime(), s.MaxAge)
}
func (s *StaticOptions) Middleware() echo.MiddlewareFunc {
render := s.getRender()
opener := s.getOpener()
hasIndex := len(s.Index) > 0
length := len(s.Path)
return func(next echo.Handler) echo.Handler {
return echo.HandlerFunc(func(c echo.Context) error {
if s.Skipper(c) {
return next.Handle(c)
}
file := c.Request().URL().Path()
sz := len(file)
if sz < length {
return next.Handle(c)
}
if sz == length {
if file != s.Path {
return next.Handle(c)
}
file = ``
} else {
if file[0:length] != s.Path {
return next.Handle(c)
}
file = file[length:]
file = path.Clean(file)
}
err := s.findFile(c, s.Root, hasIndex, file, render, opener)
if err == nil {
return err
}
if err != echo.ErrNotFound {
return err
}
if len(s.Fallback) == 0 {
return err
}
for _, fallback := range s.Fallback {
if s.Debug {
log.GetLogger("echo").Debug(`[middleware][static] `, `fallback -> `, filepath.Join(fallback, file))
}
err = s.findFile(c, fallback, hasIndex, file, render, opener)
if err == nil {
return err
}
if err != echo.ErrNotFound {
return err
}
}
return err
})
}
}
func listDirByCustomFS(absFile string, file string, c echo.Context, render func(echo.Context, interface{}) error, opener func(string) (http.File, error)) error {
d, err := opener(absFile)
if err != nil {
return echo.ErrNotFound
}
defer d.Close()
dirs, err := d.Readdir(-1)
if err != nil {
return echo.ErrNotFound
}
return render(c, map[string]interface{}{
`file`: file,
`dirs`: dirs,
})
}