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package ftp
import (
"errors"
"strconv"
"strings"
"time"
)
var errUnsupportedListLine = errors.New("Unsupported LIST line")
var listLineParsers = []func(line string) (*Entry, error){
parseRFC3659ListLine,
parseLsListLine,
parseDirListLine,
parseHostedFTPLine,
}
var dirTimeFormats = []string{
"01-02-06 03:04PM",
"2006-01-02 15:04",
}
// parseRFC3659ListLine parses the style of directory line defined in RFC 3659.
func parseRFC3659ListLine(line string) (*Entry, error) {
iSemicolon := strings.Index(line, ";")
iWhitespace := strings.Index(line, " ")
if iSemicolon < 0 || iSemicolon > iWhitespace {
return nil, errUnsupportedListLine
}
e := &Entry{
Name: line[iWhitespace+1:],
}
for _, field := range strings.Split(line[:iWhitespace-1], ";") {
i := strings.Index(field, "=")
if i < 1 {
return nil, errUnsupportedListLine
}
key := field[:i]
value := field[i+1:]
switch key {
case "modify":
var err error
e.Time, err = time.Parse("20060102150405", value)
if err != nil {
return nil, err
}
case "type":
switch value {
case "dir", "cdir", "pdir":
e.Type = EntryTypeFolder
case "file":
e.Type = EntryTypeFile
}
case "size":
e.setSize(value)
}
}
return e, nil
}
// parseLsListLine parses a directory line in a format based on the output of
// the UNIX ls command.
func parseLsListLine(line string) (*Entry, error) {
// Has the first field a length of 10 bytes?
if strings.IndexByte(line, ' ') != 10 {
return nil, errUnsupportedListLine
}
scanner := newScanner(line)
fields := scanner.NextFields(6)
if len(fields) < 6 {
return nil, errUnsupportedListLine
}
if fields[1] == "folder" && fields[2] == "0" {
e := &Entry{
Type: EntryTypeFolder,
Name: scanner.Remaining(),
}
if err := e.setTime(fields[3:6]); err != nil {
return nil, err
}
return e, nil
}
if fields[1] == "0" {
fields = append(fields, scanner.Next())
e := &Entry{
Type: EntryTypeFile,
Name: scanner.Remaining(),
}
if err := e.setSize(fields[2]); err != nil {
return nil, errUnsupportedListLine
}
if err := e.setTime(fields[4:7]); err != nil {
return nil, err
}
return e, nil
}
// Read two more fields
fields = append(fields, scanner.NextFields(2)...)
if len(fields) < 8 {
return nil, errUnsupportedListLine
}
e := &Entry{
Name: scanner.Remaining(),
}
switch fields[0][0] {
case '-':
e.Type = EntryTypeFile
if err := e.setSize(fields[4]); err != nil {
return nil, err
}
case 'd':
e.Type = EntryTypeFolder
case 'l':
e.Type = EntryTypeLink
default:
return nil, errors.New("Unknown entry type")
}
if err := e.setTime(fields[5:8]); err != nil {
return nil, err
}
return e, nil
}
// parseDirListLine parses a directory line in a format based on the output of
// the MS-DOS DIR command.
func parseDirListLine(line string) (*Entry, error) {
e := &Entry{}
var err error
// Try various time formats that DIR might use, and stop when one works.
for _, format := range dirTimeFormats {
if len(line) > len(format) {
e.Time, err = time.Parse(format, line[:len(format)])
if err == nil {
line = line[len(format):]
break
}
}
}
if err != nil {
// None of the time formats worked.
return nil, errUnsupportedListLine
}
line = strings.TrimLeft(line, " ")
if strings.HasPrefix(line, "<DIR>") {
e.Type = EntryTypeFolder
line = strings.TrimPrefix(line, "<DIR>")
} else {
space := strings.Index(line, " ")
if space == -1 {
return nil, errUnsupportedListLine
}
e.Size, err = strconv.ParseUint(line[:space], 10, 64)
if err != nil {
return nil, errUnsupportedListLine
}
e.Type = EntryTypeFile
line = line[space:]
}
e.Name = strings.TrimLeft(line, " ")
return e, nil
}
// parseHostedFTPLine parses a directory line in the non-standard format used
// by hostedftp.com
// -r-------- 0 user group 65222236 Feb 24 00:39 UABlacklistingWeek8.csv
// (The link count is inexplicably 0)
func parseHostedFTPLine(line string) (*Entry, error) {
// Has the first field a length of 10 bytes?
if strings.IndexByte(line, ' ') != 10 {
return nil, errUnsupportedListLine
}
scanner := newScanner(line)
fields := scanner.NextFields(9)
if fields[1] == "0" { // Set link count to 1 and attempt to parse as Unix.
fields[1] = "1"
newLine := strings.Join(fields, " ")
return parseLsListLine(newLine)
}
return nil, errUnsupportedListLine
}
// parseListLine parses the various non-standard format returned by the LIST
// FTP command.
func parseListLine(line string) (*Entry, error) {
for _, f := range listLineParsers {
e, err := f(line)
if err != errUnsupportedListLine {
return e, err
}
}
return nil, errUnsupportedListLine
}
func (e *Entry) setSize(str string) (err error) {
e.Size, err = strconv.ParseUint(str, 0, 64)
return
}
func (e *Entry) setTime(fields []string) (err error) {
var timeStr string
if strings.Contains(fields[2], ":") { // this year
thisYear, _, _ := time.Now().Date()
timeStr = fields[1] + " " + fields[0] + " " + strconv.Itoa(thisYear)[2:4] + " " + fields[2] + " GMT"
} else { // not this year
if len(fields[2]) != 4 {
return errors.New("Invalid year format in time string")
}
timeStr = fields[1] + " " + fields[0] + " " + fields[2][2:4] + " 00:00 GMT"
}
e.Time, err = time.Parse("_2 Jan 06 15:04 MST", timeStr)
return
}
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