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net/mail: ParseDate Does not correctly parse RFC5322 timezone #39906

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NDagestad opened this issue Jun 29, 2020 · 10 comments
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net/mail: ParseDate Does not correctly parse RFC5322 timezone #39906

NDagestad opened this issue Jun 29, 2020 · 10 comments
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FrozenDueToAge help wanted NeedsFix The path to resolution is known, but the work has not been done.
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@NDagestad
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NDagestad commented Jun 29, 2020 •
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What version of Go are you using (go version)?

$ go version
go version go1.14.4 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
...
GOARCH="amd64"
GOHOSTARCH="amd64"
GOOS="linux"
...

What did you do?

https://play.golang.org/p/BFTQrcW9JzP

package main

import (
	"fmt"
	"net/mail"
)

func main() {
	t, err := mail.ParseDate("Sun, 28 Jun 2020 21:51:24 UT")
	if err != nil {
		fmt.Printf("%v\n", err)
	} else {
		fmt.Printf("%s\n", t)
	}
}

What did you expect to see?

2020-06-28 21:51:24 +0000 UT

What did you see instead?

mail: header could not be parsed

Research

I looked at the source and found where the problem lies.
time.Parse() does not accept UT as a valide timezone even though rfc5322 allows it (section 4.3) because time.parseTimeZone() does not see a timezone with less than 3 characters as valid.

This could be fixed by adding a special case in email.ParseDate() if the timezone is "UT" and change it to something time.Parse() accepts, or adding yet another special case to time.Parse().
@ianlancetaylor ianlancetaylor changed the title mail.ParseDate Does not correctly parse RFC5322 timezone net/mail: ParseDate Does not correctly parse RFC5322 timezone Jun 29, 2020
@ianlancetaylor ianlancetaylor added help wanted NeedsFix The path to resolution is known, but the work has not been done. labels Jun 29, 2020
@ianlancetaylor ianlancetaylor added this to the Backlog milestone Jun 29, 2020
@gopherbot
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Change https://golang.org/cl/240357 mentions this issue: time: parse RFC5233 timezone UT correctly

@iwdgo
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iwdgo commented Jul 17, 2020

Somehow duplicates #39260 as obsolete time zones are not supported.

@NDagestad
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Do you mean it should not be fixed ?
I get that obsolete timezones should not be generated, but there are many mail servers still sending email with them in their date fields.
Regardless, all the obsolete timezones should be treated the same way, don't you think ?

@ianlancetaylor
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I think the point is that any fix in this area may as well fix both issues at the same time.

@ArashAckDev
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@ianlancetaylor I'm going for this if it's not a work in progress.
It will be my first contribution to Go Repo, any tips would be appreciated. :-D

@ianlancetaylor
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@jimist Go for it. Thanks. The place to change is probably net/mail.ParseDate.

@ArashAckDev ArashAckDev mentioned this issue Jan 1, 2021
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@gopherbot
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Change https://golang.org/cl/281052 mentions this issue: net/http: add UT to mail ParseDate

@ArashAckDev ArashAckDev mentioned this issue Jan 1, 2021
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@ArashAckDev
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@ianlancetaylor
As a follow-up explanation, the tests of UT were used for testing if any timezone with T shouldn't work and they're now valid.
Since UT is just a standard, I replaced it with UTC to be used as the timezone.

@gopherbot
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Change https://golang.org/cl/281072 mentions this issue: net/http: add UT to mail ParseDate

@gopherbot
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Change https://go.dev/cl/396214 mentions this issue: net/mail: accept UT as a timezone

@golang golang locked and limited conversation to collaborators Mar 28, 2023
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@ianlancetaylor @gopherbot @ArashAckDev @iwdgo @NDagestad