|
| 1 | +// Package disk provides access to local files on the disk |
| 2 | +package disk |
| 3 | + |
| 4 | +import ( |
| 5 | + "errors" |
| 6 | + "io/ioutil" |
| 7 | + "os" |
| 8 | + "path/filepath" |
| 9 | + "strings" |
| 10 | + |
| 11 | + "github.com/fclairamb/ftpserver/server" |
| 12 | + "github.com/fclairamb/ftpserver/server/log" |
| 13 | +) |
| 14 | + |
| 15 | +// Driver provides an implementation of driver for disk access |
| 16 | +type Driver struct { |
| 17 | + baseDir string // Local directory used as base directory |
| 18 | + logger log.Logger // Logger |
| 19 | +} |
| 20 | + |
| 21 | +// ChangeDirectory changes the current working directory |
| 22 | +func (driver *Driver) ChangeDirectory(cc server.ClientContext, directory string) error { |
| 23 | + if strings.HasPrefix(directory, "/root") { |
| 24 | + return errors.New("this doesn't look good") |
| 25 | + } else if directory == "/virtual" { |
| 26 | + return nil |
| 27 | + } |
| 28 | + |
| 29 | + _, err := os.Stat(driver.baseDir + directory) |
| 30 | + |
| 31 | + return err |
| 32 | +} |
| 33 | + |
| 34 | +// MakeDirectory creates a directory |
| 35 | +func (driver *Driver) MakeDirectory(cc server.ClientContext, directory string) error { |
| 36 | + return os.Mkdir(driver.baseDir+directory, 0750) |
| 37 | +} |
| 38 | + |
| 39 | +// ListFiles lists the files of a directory |
| 40 | +func (driver *Driver) ListFiles(cc server.ClientContext) ([]os.FileInfo, error) { |
| 41 | + return ioutil.ReadDir(driver.baseDir + cc.Path()) |
| 42 | +} |
| 43 | + |
| 44 | +// OpenFile opens a file in 3 possible modes: read, write, appending write (use appropriate flags) |
| 45 | +func (driver *Driver) OpenFile(cc server.ClientContext, path string, flag int) (server.FileStream, error) { |
| 46 | + path = filepath.Join(driver.baseDir, path) |
| 47 | + |
| 48 | + // If we are writing and we are not in append mode, we should remove the file |
| 49 | + if (flag & os.O_WRONLY) != 0 { |
| 50 | + flag |= os.O_CREATE |
| 51 | + if (flag & os.O_APPEND) == 0 { |
| 52 | + if _, errStat := os.Stat(path); errStat == nil { |
| 53 | + if errRemove := os.Remove(path); errRemove != nil { |
| 54 | + driver.logger.Error( |
| 55 | + "msg", "Could not remove file", |
| 56 | + "path", path, |
| 57 | + "err", errRemove, |
| 58 | + ) |
| 59 | + } |
| 60 | + } else if !os.IsNotExist(errStat) { |
| 61 | + driver.logger.Error("We had an error checking for a file", |
| 62 | + "path", path, |
| 63 | + "err", errStat, |
| 64 | + ) |
| 65 | + } |
| 66 | + } |
| 67 | + } |
| 68 | + |
| 69 | + return os.OpenFile(path, flag, 0600) |
| 70 | +} |
| 71 | + |
| 72 | +// CanAllocate gives the approval to allocate some data |
| 73 | +func (driver *Driver) CanAllocate(cc server.ClientContext, size int) (bool, error) { |
| 74 | + return true, nil |
| 75 | +} |
| 76 | + |
| 77 | +// GetFileInfo gets some info around a file or a directory |
| 78 | +func (driver *Driver) GetFileInfo(cc server.ClientContext, path string) (os.FileInfo, error) { |
| 79 | + path = driver.baseDir + path |
| 80 | + |
| 81 | + return os.Stat(path) |
| 82 | +} |
| 83 | + |
| 84 | +// DeleteFile deletes a file or a directory |
| 85 | +func (driver *Driver) DeleteFile(cc server.ClientContext, path string) error { |
| 86 | + return os.Remove(filepath.Join(driver.baseDir, path)) |
| 87 | +} |
| 88 | + |
| 89 | +// RenameFile renames a file or a directory |
| 90 | +func (driver *Driver) RenameFile(cc server.ClientContext, from, to string) error { |
| 91 | + return os.Rename( |
| 92 | + filepath.Join(driver.baseDir, from), |
| 93 | + filepath.Join(driver.baseDir, to), |
| 94 | + ) |
| 95 | +} |
| 96 | + |
| 97 | +// ChmodFile changes the attributes of the file |
| 98 | +func (driver *Driver) ChmodFile(cc server.ClientContext, path string, mode os.FileMode) error { |
| 99 | + path = driver.baseDir + path |
| 100 | + |
| 101 | + return os.Chmod(path, mode) |
| 102 | +} |
| 103 | + |
| 104 | +// NewDriver creates a new instance on a particular directory |
| 105 | +func NewDriver(directory string, logger log.Logger) (*Driver, error) { |
| 106 | + return &Driver{ |
| 107 | + baseDir: directory, |
| 108 | + logger: logger, |
| 109 | + }, nil |
| 110 | +} |
| 111 | + |
| 112 | +// NewDriverTemp creates a new instance of this on a temporary directory |
| 113 | +func NewDriverTemp(logger log.Logger) (*Driver, error) { |
| 114 | + dir := "/tmp/ftpisback" |
| 115 | + |
| 116 | + if errStat := os.MkdirAll(dir, 0750); errStat != nil { |
| 117 | + logger.Info("msg", "Couldn't get our preferred dir", "dir", dir, "err", errStat) |
| 118 | + dir, errStat = ioutil.TempDir("", "ftpserver") |
| 119 | + |
| 120 | + if errStat != nil { |
| 121 | + logger.Error("msg", "Could not find a temporary dir", "err", errStat) |
| 122 | + } |
| 123 | + } |
| 124 | + |
| 125 | + return NewDriver(dir, logger) |
| 126 | +} |
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