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package fileserver
import (
"bytes"
"encoding/json"
"html/template"
"net/http"
"os"
"path"
"strings"
"bitbucket.org/lightcodelabs/caddy2"
"bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp"
)
// Browse configures directory browsing.
type Browse struct {
TemplateFile string `json:"template_file"`
template *template.Template
}
func (fsrv *FileServer) serveBrowse(dirPath string, w http.ResponseWriter, r *http.Request) error {
// navigation on the client-side gets messed up if the
// URL doesn't end in a trailing slash because hrefs like
// "/b/c" on a path like "/a" end up going to "/b/c" instead
// of "/a/b/c" - so we have to redirect in this case
if !strings.HasSuffix(r.URL.Path, "/") {
r.URL.Path += "/"
http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
return nil
}
dir, err := fsrv.openFile(dirPath, w)
if err != nil {
return err
}
defer dir.Close()
repl := r.Context().Value(caddy2.ReplacerCtxKey).(caddy2.Replacer)
// calling path.Clean here prevents weird breadcrumbs when URL paths are sketchy like /%2e%2e%2f
listing, err := fsrv.loadDirectoryContents(dir, path.Clean(r.URL.Path), repl)
switch {
case os.IsPermission(err):
return caddyhttp.Error(http.StatusForbidden, err)
case os.IsNotExist(err):
return caddyhttp.Error(http.StatusNotFound, err)
case err != nil:
return caddyhttp.Error(http.StatusInternalServerError, err)
}
fsrv.browseApplyQueryParams(w, r, &listing)
// write response as either JSON or HTML
var buf *bytes.Buffer
acceptHeader := strings.ToLower(strings.Join(r.Header["Accept"], ","))
if strings.Contains(acceptHeader, "application/json") {
if buf, err = fsrv.browseWriteJSON(listing); err != nil {
return caddyhttp.Error(http.StatusInternalServerError, err)
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
} else {
if buf, err = fsrv.browseWriteHTML(listing); err != nil {
return caddyhttp.Error(http.StatusInternalServerError, err)
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
}
buf.WriteTo(w)
return nil
}
func (fsrv *FileServer) loadDirectoryContents(dir *os.File, urlPath string, repl caddy2.Replacer) (browseListing, error) {
files, err := dir.Readdir(-1)
if err != nil {
return browseListing{}, err
}
// determine if user can browse up another folder
curPathDir := path.Dir(strings.TrimSuffix(urlPath, "/"))
canGoUp := strings.HasPrefix(curPathDir, fsrv.Root)
return fsrv.directoryListing(files, canGoUp, urlPath, repl), nil
}
// browseApplyQueryParams applies query parameters to the listing.
// It mutates the listing and may set cookies.
func (fsrv *FileServer) browseApplyQueryParams(w http.ResponseWriter, r *http.Request, listing *browseListing) {
sortParam := r.URL.Query().Get("sort")
orderParam := r.URL.Query().Get("order")
limitParam := r.URL.Query().Get("limit")
// first figure out what to sort by
switch sortParam {
case "":
sortParam = sortByNameDirFirst
if sortCookie, sortErr := r.Cookie("sort"); sortErr == nil {
sortParam = sortCookie.Value
}
case sortByName, sortByNameDirFirst, sortBySize, sortByTime:
http.SetCookie(w, &http.Cookie{Name: "sort", Value: sortParam, Secure: r.TLS != nil})
}
// then figure out the order
switch orderParam {
case "":
orderParam = "asc"
if orderCookie, orderErr := r.Cookie("order"); orderErr == nil {
orderParam = orderCookie.Value
}
case "asc", "desc":
http.SetCookie(w, &http.Cookie{Name: "order", Value: orderParam, Secure: r.TLS != nil})
}
// finally, apply the sorting and limiting
listing.applySortAndLimit(sortParam, orderParam, limitParam)
}
func (fsrv *FileServer) browseWriteJSON(listing browseListing) (*bytes.Buffer, error) {
buf := new(bytes.Buffer)
err := json.NewEncoder(buf).Encode(listing.Items)
return buf, err
}
func (fsrv *FileServer) browseWriteHTML(listing browseListing) (*bytes.Buffer, error) {
buf := new(bytes.Buffer)
err := fsrv.Browse.template.Execute(buf, listing)
return buf, err
}
// isSymlink return true if f is a symbolic link
func isSymlink(f os.FileInfo) bool {
return f.Mode()&os.ModeSymlink != 0
}
// isSymlinkTargetDir returns true if f's symbolic link target
// is a directory.
func isSymlinkTargetDir(f os.FileInfo, root, urlPath string) bool {
if !isSymlink(f) {
return false
}
target := sanitizedPathJoin(root, path.Join(urlPath, f.Name()))
targetInfo, err := os.Stat(target)
if err != nil {
return false
}
return targetInfo.IsDir()
}
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