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package main
import (
"errors"
"fmt"
"net/http"
"net/url"
"os"
"os/user"
"path/filepath"
"regexp"
"strings"
)
type ServerError struct {
Err error
Message string
Status int
}
func (e *ServerError) Error() string { return e.Err.Error() }
func (e *ServerError) Unwrap() error { return e.Err }
func getFileNode(URL string) (*FileNode, *ServerError) {
path, err := url.PathUnescape(URL)
if err != nil {
return nil, &ServerError{err, "", 500}
}
p := strings.Split(path, "/")
fileURI := strings.Trim(strings.Join(p[2:], "/"), "/")
filePath := filepath.Join(homeDir, fileURI)
fileInfo, err := os.Lstat(filePath)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil, &ServerError{err, fileURI+" not found", 404}
}
return nil, &ServerError{err, "", 500}
}
return &FileNode{
Path: filePath,
URI: fileURI,
IsDir: fileInfo.IsDir(),
Info: fileInfo,
}, nil
}
var filePattern = regexp.MustCompile(`^-file-entry--(.+)$`)
func getSelectedNodes(r *http.Request) (*FileNode, []*FileNode, *ServerError) {
fileNode, e := getFileNode(r.URL.Path)
if e != nil {
return nil, nil, e
}
r.ParseMultipartForm(65536)
fmt.Println(r.Form)
var fileNames []string
for key := range r.Form {
if match := filePattern.FindStringSubmatch(key); len(match) > 1 {
fileNames = append(fileNames, match[1])
}
}
fmt.Printf("FileNames: %s\n", fileNames)
if len(fileNames) == 0 {
return fileNode, []*FileNode{fileNode}, nil
}
files := make([]*FileNode, len(fileNames))
for i, fileName := range fileNames {
fileNode, e := getFileNode(filepath.Join(r.URL.Path, fileName))
if e != nil {
return fileNode, nil, e
}
files[i] = fileNode
}
return fileNode, files, nil
}
func sendFile(w http.ResponseWriter, r *http.Request, info ...string) {
fmt.Printf("info: %s\n", info[:])
if len(info) < 2 {
info = append(info, filepath.Base(info[0]))
}
w.Header().Set("Content-Disposition", "attachment; filename=" + info[1])
http.ServeFile(w, r, info[0])
}
func addSelectionToBuffer(w http.ResponseWriter, r *http.Request, bufferPath string) *ServerError {
_, files, e := getSelectedNodes(r)
if e != nil {
return e
}
buffer, err := readBuffer(bufferPath)
if err != nil {
return &ServerError{err, "", 500}
}
buff, err := os.OpenFile(bufferPath, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
return &ServerError{err, "", 500}
}
var fileURI string
writeToBuffer:
for _, file := range files {
fileURI = strings.Trim(file.URI, "/")
for _, line := range buffer {
if strings.Trim(line, "/") == fileURI {
continue writeToBuffer
}
}
if file.IsDir {
fileURI += "/"
}
buff.WriteString("/" + fileURI + "\r\n")
}
http.Redirect(w, r, r.URL.Path, 303)
return nil
}
func deleteBuffer(w http.ResponseWriter, r *http.Request, bufferPath string) *ServerError {
err := os.Remove(bufferPath)
if err != nil {
return &ServerError{err, "", 500}
}
http.Redirect(w, r, r.URL.Path, 303)
return nil
}
func moveFilesFromBuffer(w http.ResponseWriter, r *http.Request, bufferPath string) *ServerError {
fileNode, serr := getFileNode(r.URL.Path)
if serr != nil {
return serr
}
if !fileNode.IsDir {
return &ServerError{nil, "Cannot move file, destination is not a directory", 400}
}
buffer, err := readBuffer(bufferPath)
if err != nil {
return &ServerError{err, "", 500}
}
for _, line := range buffer {
err := copyTo(filepath.Join(homeDir, line), fileNode.Path)
if err != nil {
return &ServerError{err, "", 500}
}
}
deleteBuffer(w, r, bufferPath)
return nil
}
func pasteFilesFromBuffer(w http.ResponseWriter, r *http.Request, bufferPath string) *ServerError {
fileNode, serr := getFileNode(r.URL.Path)
if serr != nil {
return serr
}
if !fileNode.IsDir {
return &ServerError{nil, "Cannot copy files, destination is not a directory", 400}
}
buffer, err := readBuffer(bufferPath)
if err != nil {
return &ServerError{err, "", 500}
}
fmt.Printf("Buffer content: %s\n", buffer)
for _, line := range buffer {
err := copyTo(filepath.Join(homeDir, line), fileNode.Path)
if err != nil {
return &ServerError{err, "", 500}
}
}
deleteBuffer(w, r, bufferPath)
return nil
}
func createNewDirectory(w http.ResponseWriter, r *http.Request) *ServerError {
fileNode, serr := getFileNode(r.URL.Path)
if serr != nil {
return serr
}
dirname := strings.TrimSpace(r.FormValue("newdir"))
msg := "Requested to create directory '"+dirname+"' in "+fileNode.URI+"\n"
if dirname == "" {
msg = "Directory name cannot be empty.\n" + msg
return &ServerError{nil, msg, 400}
}
if !fileNode.IsDir {
msg = "Cannot create directory, the given destination is a file.\n" + msg
return &ServerError{nil, msg, 400}
}
path := filepath.Join(fileNode.Path, dirname)
isExist, err := fileExists(path)
if isExist {
msg = "Cannot create directory, a file with given name already exists.\n" + msg
return &ServerError{nil, msg, 400}
}
err = os.Mkdir(path, 0755)
if err != nil {
return &ServerError{err, "", 500}
}
http.Redirect(w, r, r.URL.Path, 303)
return nil
}
func blockAction(w http.ResponseWriter, r *http.Request, action string) *ServerError {
msg := ""
_, files, serr := getSelectedNodes(r)
if serr != nil {
return serr
}
msg += "The " + action + " operation is currently disabled for testing and security reasons.\n"
msg += "You requested to " + action + " following files :-\n\n"
for _, file := range files {
msg += file.Path + "\n"
}
fmt.Fprintf(w, msg)
return nil
}
func deleteSelectedFiles(w http.ResponseWriter, r *http.Request) *ServerError {
// return blockAction(w, r, "delete")
fileNode, files, serr := getSelectedNodes(r)
if serr != nil {
return serr
}
for _, file := range files {
if file.Path == homeDir {
return &ServerError{nil, "Cannot delete root directory.", 400}
}
fmt.Printf("Deleting: %s\n", file.Path)
err := os.RemoveAll(file.Path)
if err != nil {
return &ServerError{err, "", 500}
}
fmt.Println("Deleted.")
}
isExist, err := fileExists(fileNode.Path)
if err != nil {
return &ServerError{err, "", 500}
}
if !isExist {
http.Redirect(w, r, "/view/" + filepath.Dir(fileNode.URI), 303)
} else {
http.Redirect(w, r, "/view/" + fileNode.URI, 303)
}
return nil
}
var (
homeDir = "/media/"
tempDir = "/tmp/cloud/"
cutBuffer = filepath.Join(tempDir, "cut_buffer")
copyBuffer = filepath.Join(tempDir, "copy_buffer")
)
func init() {
err := os.MkdirAll(tempDir, 0755);
if err != nil {
panic(err)
}
mountpoint := os.Getenv("CLOUD_MAKER_HOME")
if mountpoint != "" {
isExist, err := fileExists(mountpoint)
if err != nil {
panic(err)
}
if isExist {
homeDir = mountpoint
}
return
}
u, err := user.Current()
if err != nil {
panic(err)
}
homeDir += u.Username
}
|
