Vendor github.com/jlaffaye/ftp for ftp backend

vendor/github.com/jlaffaye/ftp/parse.go

@@ -0,0 +1,213 @@
+package ftp
+
+import (
+	"errors"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var errUnsupportedListLine = errors.New("Unsupported LIST line")
+
+var listLineParsers = []func(line string) (*Entry, error){
+	parseRFC3659ListLine,
+	parseLsListLine,
+	parseDirListLine,
+}
+
+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, err
+		}
+		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
+}
+
+// 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
+}