73 lines
2.3 KiB
Go
73 lines
2.3 KiB
Go
package imap
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import (
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"fmt"
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"time"
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)
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// Date and time layouts.
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// Dovecot adds a leading zero to dates:
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// https://github.com/dovecot/core/blob/4fbd5c5e113078e72f29465ccc96d44955ceadc2/src/lib-imap/imap-date.c#L166
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// Cyrus adds a leading space to dates:
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// https://github.com/cyrusimap/cyrus-imapd/blob/1cb805a3bffbdf829df0964f3b802cdc917e76db/lib/times.c#L543
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// GMail doesn't support leading spaces in dates used in SEARCH commands.
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const (
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// Defined in RFC 3501 as date-text on page 83.
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DateLayout = "_2-Jan-2006"
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// Defined in RFC 3501 as date-time on page 83.
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DateTimeLayout = "_2-Jan-2006 15:04:05 -0700"
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// Defined in RFC 5322 section 3.3, mentioned as env-date in RFC 3501 page 84.
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envelopeDateTimeLayout = "Mon, 02 Jan 2006 15:04:05 -0700"
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// Use as an example in RFC 3501 page 54.
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searchDateLayout = "2-Jan-2006"
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)
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// time.Time with a specific layout.
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type (
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Date time.Time
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DateTime time.Time
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envelopeDateTime time.Time
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searchDate time.Time
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)
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// Permutations of the layouts defined in RFC 5322, section 3.3.
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var envelopeDateTimeLayouts = [...]string{
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envelopeDateTimeLayout, // popular, try it first
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"_2 Jan 2006 15:04:05 -0700",
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"_2 Jan 2006 15:04:05 MST",
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"_2 Jan 2006 15:04:05 -0700 (MST)",
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"_2 Jan 2006 15:04 -0700",
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"_2 Jan 2006 15:04 MST",
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"_2 Jan 2006 15:04 -0700 (MST)",
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"_2 Jan 06 15:04:05 -0700",
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"_2 Jan 06 15:04:05 MST",
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"_2 Jan 06 15:04:05 -0700 (MST)",
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"_2 Jan 06 15:04 -0700",
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"_2 Jan 06 15:04 MST",
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"_2 Jan 06 15:04 -0700 (MST)",
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"Mon, _2 Jan 2006 15:04:05 -0700",
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"Mon, _2 Jan 2006 15:04:05 MST",
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"Mon, _2 Jan 2006 15:04:05 -0700 (MST)",
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"Mon, _2 Jan 2006 15:04 -0700",
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"Mon, _2 Jan 2006 15:04 MST",
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"Mon, _2 Jan 2006 15:04 -0700 (MST)",
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"Mon, _2 Jan 06 15:04:05 -0700",
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"Mon, _2 Jan 06 15:04:05 MST",
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"Mon, _2 Jan 06 15:04:05 -0700 (MST)",
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"Mon, _2 Jan 06 15:04 -0700",
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"Mon, _2 Jan 06 15:04 MST",
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"Mon, _2 Jan 06 15:04 -0700 (MST)",
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}
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// Try parsing the date based on the layouts defined in RFC 5322, section 3.3.
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// Inspired by https://github.com/golang/go/blob/master/src/net/mail/message.go
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func parseMessageDateTime(maybeDate string) (time.Time, error) {
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for _, layout := range envelopeDateTimeLayouts {
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parsed, err := time.Parse(layout, maybeDate)
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if err == nil {
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return parsed, nil
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}
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}
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return time.Time{}, fmt.Errorf("date %s could not be parsed", maybeDate)
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}
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