filebrowser/http.go
2017-06-25 09:11:25 +01:00

173 lines
4.2 KiB
Go

package filemanager
import (
"errors"
"net/http"
"os"
"path/filepath"
"strings"
)
func matchURL(first, second string) bool {
first = strings.ToLower(first)
second = strings.ToLower(second)
return strings.HasPrefix(first, second)
}
// ServeHTTP determines if the request is for this plugin, and if all prerequisites are met.
func (c *FileManager) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
var (
fi *FileInfo
code int
err error
user *User
)
// Checks if the URL matches the Assets URL. Returns the asset if the
// method is GET and Status Forbidden otherwise.
if matchURL(r.URL.Path, c.BaseURL+AssetsURL) {
if r.Method == http.MethodGet {
return serveAssets(w, r, c)
}
return http.StatusForbidden, nil
}
username, _, _ := r.BasicAuth()
if _, ok := c.Users[username]; ok {
user = c.Users[username]
} else {
user = c.User
}
// Checks if the request URL is for the WebDav server
if matchURL(r.URL.Path, c.WebDavURL) {
// Checks for user permissions relatively to this PATH
if !user.Allowed(strings.TrimPrefix(r.URL.Path, c.WebDavURL)) {
return http.StatusForbidden, nil
}
switch r.Method {
case "GET", "HEAD":
// Excerpt from RFC4918, section 9.4:
//
// GET, when applied to a collection, may return the contents of an
// "index.html" resource, a human-readable view of the contents of
// the collection, or something else altogether.
//
// It was decided on https://github.com/hacdias/caddy-filemanager/issues/85
// that GET, for collections, will return the same as PROPFIND method.
path := strings.Replace(r.URL.Path, c.WebDavURL, "", 1)
path = user.Scope + "/" + path
path = filepath.Clean(path)
var i os.FileInfo
i, err = os.Stat(path)
if err != nil {
// Is there any error? WebDav will handle it... no worries.
break
}
if i.IsDir() {
r.Method = "PROPFIND"
if r.Method == "HEAD" {
w = newResponseWriterNoBody(w)
}
}
case "PROPPATCH", "MOVE", "PATCH", "PUT", "DELETE":
if !user.AllowEdit {
return http.StatusForbidden, nil
}
case "MKCOL", "COPY":
if !user.AllowNew {
return http.StatusForbidden, nil
}
}
// Preprocess the PUT request if it's the case
if r.Method == http.MethodPut {
if err = c.BeforeSave(r, c, user); err != nil {
return http.StatusInternalServerError, err
}
if put(w, r, c, user) != nil {
return http.StatusInternalServerError, err
}
}
c.Handler.ServeHTTP(w, r)
if err = c.AfterSave(r, c, user); err != nil {
return http.StatusInternalServerError, err
}
return 0, nil
}
w.Header().Set("x-frame-options", "SAMEORIGIN")
w.Header().Set("x-content-type", "nosniff")
w.Header().Set("x-xss-protection", "1; mode=block")
// Checks if the User is allowed to access this file
if !user.Allowed(strings.TrimPrefix(r.URL.Path, c.BaseURL)) {
if r.Method == http.MethodGet {
return PrintErrorHTML(
w, http.StatusForbidden,
errors.New("You don't have permission to access this page"),
)
}
return http.StatusForbidden, nil
}
if r.URL.Query().Get("search") != "" {
return search(w, r, c, user)
}
if r.URL.Query().Get("command") != "" {
return command(w, r, c, user)
}
if r.Method == http.MethodGet {
// Gets the information of the directory/file
fi, err = GetInfo(r.URL, c, user)
if err != nil {
if r.Method == http.MethodGet {
return PrintErrorHTML(w, code, err)
}
code = errorToHTTP(err, false)
return code, err
}
// If it's a dir and the path doesn't end with a trailing slash,
// redirect the user.
if fi.IsDir && !strings.HasSuffix(r.URL.Path, "/") {
http.Redirect(w, r, c.PrefixURL+r.URL.Path+"/", http.StatusTemporaryRedirect)
return 0, nil
}
switch {
case r.URL.Query().Get("download") != "":
code, err = download(w, r, fi)
case r.URL.Query().Get("raw") == "true" && !fi.IsDir:
http.ServeFile(w, r, fi.Path)
code, err = 0, nil
case !fi.IsDir && r.URL.Query().Get("checksum") != "":
code, err = checksum(w, r, fi)
case fi.IsDir:
code, err = serveListing(w, r, c, user, fi)
default:
code, err = serveSingle(w, r, c, user, fi)
}
if err != nil {
code, err = PrintErrorHTML(w, code, err)
}
return code, err
}
return http.StatusNotImplemented, nil
}