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105 lines
2.4 KiB
105 lines
2.4 KiB
package ber
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import (
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"bytes"
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"errors"
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"fmt"
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"strconv"
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"time"
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)
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// ErrInvalidTimeFormat is returned when the generalizedTime string was not correct.
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var ErrInvalidTimeFormat = errors.New("invalid time format")
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var zeroTime = time.Time{}
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// ParseGeneralizedTime parses a string value and if it conforms to
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// GeneralizedTime[^0] format, will return a time.Time for that value.
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//
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// [^0]: https://www.itu.int/rec/T-REC-X.690-201508-I/en Section 11.7
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func ParseGeneralizedTime(v []byte) (time.Time, error) {
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var format string
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var fract time.Duration
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str := []byte(DecodeString(v))
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tzIndex := bytes.IndexAny(str, "Z+-")
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if tzIndex < 0 {
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return zeroTime, ErrInvalidTimeFormat
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}
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dot := bytes.IndexAny(str, ".,")
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switch dot {
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case -1:
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switch tzIndex {
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case 10:
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format = `2006010215Z`
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case 12:
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format = `200601021504Z`
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case 14:
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format = `20060102150405Z`
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default:
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return zeroTime, ErrInvalidTimeFormat
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}
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case 10, 12:
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if tzIndex < dot {
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return zeroTime, ErrInvalidTimeFormat
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}
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// a "," is also allowed, but would not be parsed by time.Parse():
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str[dot] = '.'
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// If <minute> is omitted, then <fraction> represents a fraction of an
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// hour; otherwise, if <second> and <leap-second> are omitted, then
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// <fraction> represents a fraction of a minute; otherwise, <fraction>
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// represents a fraction of a second.
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// parse as float from dot to timezone
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f, err := strconv.ParseFloat(string(str[dot:tzIndex]), 64)
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if err != nil {
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return zeroTime, fmt.Errorf("failed to parse float: %s", err)
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}
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// ...and strip that part
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str = append(str[:dot], str[tzIndex:]...)
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tzIndex = dot
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if dot == 10 {
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fract = time.Duration(int64(f * float64(time.Hour)))
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format = `2006010215Z`
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} else {
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fract = time.Duration(int64(f * float64(time.Minute)))
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format = `200601021504Z`
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}
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case 14:
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if tzIndex < dot {
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return zeroTime, ErrInvalidTimeFormat
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}
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str[dot] = '.'
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// no need for fractional seconds, time.Parse() handles that
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format = `20060102150405Z`
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default:
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return zeroTime, ErrInvalidTimeFormat
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}
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l := len(str)
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switch l - tzIndex {
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case 1:
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if str[l-1] != 'Z' {
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return zeroTime, ErrInvalidTimeFormat
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}
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case 3:
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format += `0700`
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str = append(str, []byte("00")...)
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case 5:
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format += `0700`
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default:
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return zeroTime, ErrInvalidTimeFormat
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}
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t, err := time.Parse(format, string(str))
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if err != nil {
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return zeroTime, fmt.Errorf("%s: %s", ErrInvalidTimeFormat, err)
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}
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return t.Add(fract), nil
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}
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