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go-mail/eml_test.go
Winni Neessen ed93e51cec
Add support for 7bit and 8bit encodings in EML parsing 
Enhanced EML parsing to handle 7bit and 8bit content transfer encodings. Updated related test cases to verify the correct handling of these encodings. This ensures compliance with RFC2045 for defaulting to 7bit when no encoding is specified.
2024-08-01 10:55:28 +02:00

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// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
//
// SPDX-License-Identifier: MIT
package mail
import (
"bytes"
"fmt"
"os"
"strings"
"testing"
"time"
)
const (
exampleMailPlainNoEnc = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlain7Bit = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainBrokenBody = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: base64
This plain text body should not be parsed as Base64.
`
exampleMailPlainNoContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
This plain text body should not be parsed as Base64.
`
exampleMailPlainUnknownContentType = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: application/unknown; charset=UTF-8
Content-Transfer-Encoding: base64
This plain text body should not be parsed as Base64.
`
exampleMailPlainBrokenHeader = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version = 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent = go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From = "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding = 8bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainBrokenFrom = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: Toni Tester" go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainBrokenTo = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: go-mail+test.go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainNoEncInvalidDate = `Date: Inv, 99 Nov 9999 99:99:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainNoEncNoDate = `MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text without encoding
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainQP = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text quoted-printable
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very lo=
ng so it
should be wrapped.
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainUnsupportedTransferEnc = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text quoted-printable
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: unknown
Dear Customer,
This is a test mail. Please do not reply to this. Also this line is very long so it should be wrapped.
㋛
This is not ==D3
Thank your for your business!
The go-mail team
--
This is a signature`
exampleMailPlainB64 = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64
User-Agent: go-mail v0.4.0 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.0 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: base64
RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
ClRoaXMgaXMgYSBzaWduYXR1cmU=`
exampleMailPlainB64WithAttachment = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64 with attachment
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/mixed;
boundary=45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset=UTF-8
RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
ClRoaXMgaXMgYSBzaWduYXR1cmU=
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
Content-Disposition: attachment; filename="test.attachment"
Content-Transfer-Encoding: base64
Content-Type: application/octet-stream; name="test.attachment"
VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
exampleMailPlainB64WithAttachmentNoBoundary = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64 with attachment
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/mixed;
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset=UTF-8
RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
ClRoaXMgaXMgYSBzaWduYXR1cmU=
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
Content-Disposition: attachment; filename="test.attachment"
Content-Transfer-Encoding: base64
Content-Type: application/octet-stream; name="test.attachment"
VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
exampleMailPlainB64BrokenBody = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64 with attachment
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/mixed;
boundary=45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
Content-Transfer-Encoding = base64
Content-Type = text/plain; charset=UTF-8
RGVhciBDdXN0b21lciwKClRoaXMgaXMgYSB0ZXN0IG1haWwuIFBsZWFzZSBkbyBub3QgcmVwbHkg
dG8gdGhpcy4gQWxzbyB0aGlzIGxpbmUgaXMgdmVyeSBsb25nIHNvIGl0CnNob3VsZCBiZSB3cmFw
cGVkLgoKClRoYW5rIHlvdXIgZm9yIHlvdXIgYnVzaW5lc3MhClRoZSBnby1tYWlsIHRlYW0KCi0t
ClRoaXMgaXMgYSBzaWduYXR1cmU=
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7
Content-Disposition: attachment; filename="test.attachment"
Content-Transfer-Encoding: base64
Content-Type: application/octet-stream; name="test.attachment"
VGhpcyBpcyBhIHNpbXBsZSB0ZXN0IHRleHQgZmlsZSBhdHRhY2htZW50LgoKSXQgCiAgaGFzCiAg
ICAgc2V2ZXJhbAogICAgICAgICAgICBuZXdsaW5lcwoJICAgICAgICAgICAgYW5kCgkgICAgc3Bh
Y2VzCiAgICAgaW4KICBpdAouCgpBcyB3ZWxsIGFzIGFuIGVtb2ppOiDwn5mCCg==
--45c75ff528359022eb03679fbe91877d75343f2e1f8193e349deffa33ff7--`
exampleMailPlainB64WithEmbed = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64 with embed
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/related;
boundary=ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b
--ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset=UTF-8
This is a test body string
--ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b
Content-Disposition: inline; filename="pixel.png"
Content-Id: <pixel.png>
Content-Transfer-Encoding: base64
Content-Type: image/png; name="pixel.png"
iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2NgYGD4DwABBAEAwS2O
UAAAAABJRU5ErkJggg==
--ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b--`
exampleMailPlainB64WithEmbedNoContentID = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64 with embed
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/related;
boundary=ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b
--ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset=UTF-8
This is a test body string
--ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b
Content-Disposition: inline; filename="pixel.png"
Content-Transfer-Encoding: base64
Content-Type: image/png; name="pixel.png"
iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2NgYGD4DwABBAEAwS2O
UAAAAABJRU5ErkJggg==
--ffbcfb94b44e5297325102f6ced05b3b37f1d70fc38a5e78dc73c1a8434b--`
exampleMailMultipartMixedAlternativeRelated = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // plain text base64 with attachment, embed and alternative part
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/mixed;
boundary=fe785e0384e2607697cc2ecb17cce003003bb7ca9112104f3e8ce727edb5
--fe785e0384e2607697cc2ecb17cce003003bb7ca9112104f3e8ce727edb5
Content-Type: multipart/related;
boundary=5897e40a22c608e252cfab849e966112fcbd5a1c291208026b3ca2bfab8a
--5897e40a22c608e252cfab849e966112fcbd5a1c291208026b3ca2bfab8a
Content-Type: multipart/alternative;
boundary=cbace12de35ef4eae53fd974ccd41cb2aee4f9c9c76057ec8bfdd0c97813
--cbace12de35ef4eae53fd974ccd41cb2aee4f9c9c76057ec8bfdd0c97813
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset=UTF-8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exampleMultiPart7BitBase64 = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // 7bit with base64 attachment
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/mixed;
boundary="------------26A45336F6C6196BD8BBA2A2"
This is a multi-part message in MIME format.
--------------26A45336F6C6196BD8BBA2A2
Content-Type: text/plain; charset=US-ASCII; format=flowed
Content-Transfer-Encoding: 7bit
testtest
testtest
testtest
testtest
testtest
testtest
--------------26A45336F6C6196BD8BBA2A2
Content-Type: text/plain; charset=UTF-8;
name="testfile.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="testfile.txt"
VGhpcyBpcyBhIHRlc3QgaW4gQmFzZTY0
--------------26A45336F6C6196BD8BBA2A2--`
exampleMultiPart8BitBase64 = `Date: Wed, 01 Nov 2023 00:00:00 +0000
MIME-Version: 1.0
Message-ID: <1305604950.683004066175.AAAAAAAAaaaaaaaaB@go-mail.dev>
Subject: Example mail // 8bit with base64 attachment
User-Agent: go-mail v0.4.1 // https://github.com/wneessen/go-mail
X-Mailer: go-mail v0.4.1 // https://github.com/wneessen/go-mail
From: "Toni Tester" <go-mail@go-mail.dev>
To: <go-mail+test@go-mail.dev>
Cc: <go-mail+cc@go-mail.dev>
Content-Type: multipart/mixed;
boundary="------------26A45336F6C6196BD8BBA2A2"
This is a multi-part message in MIME format.
--------------26A45336F6C6196BD8BBA2A2
Content-Type: text/plain; charset=US-ASCII; format=flowed
Content-Transfer-Encoding: 8bit
testtest
testtest
testtest
testtest
testtest
testtest
--------------26A45336F6C6196BD8BBA2A2
Content-Type: text/plain; charset=UTF-8;
name="testfile.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="testfile.txt"
VGhpcyBpcyBhIHRlc3QgaW4gQmFzZTY0
--------------26A45336F6C6196BD8BBA2A2--`
)
func TestEMLToMsgFromString(t *testing.T) {
tests := []struct {
name string
eml string
enc string
sub string
}{
{
"Plain text no encoding (7bit)", exampleMailPlain7Bit, "7bit",
"Example mail // plain text without encoding",
},
{
"Plain text no encoding", exampleMailPlainNoEnc, "8bit",
"Example mail // plain text without encoding",
},
{
"Plain text quoted-printable", exampleMailPlainQP, "quoted-printable",
"Example mail // plain text quoted-printable",
},
{
"Plain text base64", exampleMailPlainB64, "base64",
"Example mail // plain text base64",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
msg, err := EMLToMsgFromString(tt.eml)
if err != nil {
t.Errorf("failed to parse EML: %s", err)
}
if msg.Encoding() != tt.enc {
t.Errorf("EMLToMsgFromString failed: expected encoding: %s, but got: %s", tt.enc, msg.Encoding())
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], tt.sub) {
t.Errorf("EMLToMsgFromString failed: expected subject: %s, but got: %s",
tt.sub, subject[0])
}
})
}
}
func TestEMLToMsgFromFile(t *testing.T) {
tests := []struct {
name string
eml string
enc string
sub string
}{
{
"Plain text no encoding", exampleMailPlainNoEnc, "8bit",
"Example mail // plain text without encoding",
},
{
"Plain text quoted-printable", exampleMailPlainQP, "quoted-printable",
"Example mail // plain text quoted-printable",
},
{
"Plain text base64", exampleMailPlainB64, "base64",
"Example mail // plain text base64",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
tempDir, tempFile, err := stringToTempFile(tt.eml, tt.name)
defer func() {
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
}()
msg, err := EMLToMsgFromFile(tempFile)
if err != nil {
t.Errorf("failed to parse EML: %s", err)
}
if msg.Encoding() != tt.enc {
t.Errorf("EMLToMsgFromString failed: expected encoding: %s, but got: %s", tt.enc, msg.Encoding())
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], tt.sub) {
t.Errorf("EMLToMsgFromString failed: expected subject: %s, but got: %s",
tt.sub, subject[0])
}
})
}
}
func TestEMLToMsgFromReaderFailing(t *testing.T) {
mailbuf := bytes.NewBufferString(exampleMailPlainBrokenFrom)
_, err := EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with broken FROM was supposed to fail, but didn't")
}
mailbuf.Reset()
mailbuf.WriteString(exampleMailPlainBrokenHeader)
_, err = EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with broken header was supposed to fail, but didn't")
}
mailbuf.Reset()
mailbuf.WriteString(exampleMailPlainB64BrokenBody)
_, err = EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with broken body was supposed to fail, but didn't")
}
mailbuf.Reset()
mailbuf.WriteString(exampleMailPlainBrokenBody)
_, err = EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with broken body was supposed to fail, but didn't")
}
mailbuf.Reset()
mailbuf.WriteString(exampleMailPlainUnknownContentType)
_, err = EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with unknown content type was supposed to fail, but didn't")
}
mailbuf.Reset()
mailbuf.WriteString(exampleMailPlainNoContentType)
_, err = EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with no content type was supposed to fail, but didn't")
}
mailbuf.Reset()
mailbuf.WriteString(exampleMailPlainUnsupportedTransferEnc)
_, err = EMLToMsgFromReader(mailbuf)
if err == nil {
t.Error("EML from Reader with unsupported Transer-Encoding was supposed to fail, but didn't")
}
}
func TestEMLToMsgFromFileFailing(t *testing.T) {
tempDir, tempFile, err := stringToTempFile(exampleMailPlainBrokenFrom, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with broken FROM was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
tempDir, tempFile, err = stringToTempFile(exampleMailPlainBrokenHeader, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with broken header was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
tempDir, tempFile, err = stringToTempFile(exampleMailPlainB64BrokenBody, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with broken body was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
tempDir, tempFile, err = stringToTempFile(exampleMailPlainBrokenBody, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with broken body was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
tempDir, tempFile, err = stringToTempFile(exampleMailPlainUnknownContentType, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with unknown content type was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
tempDir, tempFile, err = stringToTempFile(exampleMailPlainNoContentType, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with no content type was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
tempDir, tempFile, err = stringToTempFile(exampleMailPlainUnsupportedTransferEnc, "testmail")
if err != nil {
t.Errorf("failed to write EML string to temp file: %s", err)
}
_, err = EMLToMsgFromFile(tempFile)
if err == nil {
t.Error("EML from Reader with unsupported Transer-Encoding was supposed to fail, but didn't")
}
if err = os.RemoveAll(tempDir); err != nil {
t.Error("failed to remove temp dir:", err)
}
}
func TestEMLToMsgFromStringBrokenDate(t *testing.T) {
_, err := EMLToMsgFromString(exampleMailPlainNoEncInvalidDate)
if err == nil {
t.Error("EML with invalid date was supposed to fail, but didn't")
}
now := time.Now()
m, err := EMLToMsgFromString(exampleMailPlainNoEncNoDate)
if err != nil {
t.Errorf("EML with no date parsing failed: %s", err)
}
da := m.GetGenHeader(HeaderDate)
if len(da) < 1 {
t.Error("EML with no date expected current date, but got nothing")
return
}
d := da[0]
if d != now.Format(time.RFC1123Z) {
t.Errorf("EML with no date expected: %s, got: %s", now.Format(time.RFC1123Z), d)
}
}
func TestEMLToMsgFromStringBrokenFrom(t *testing.T) {
_, err := EMLToMsgFromString(exampleMailPlainBrokenFrom)
if err == nil {
t.Error("EML with broken FROM was supposed to fail, but didn't")
}
}
func TestEMLToMsgFromStringBrokenTo(t *testing.T) {
_, err := EMLToMsgFromString(exampleMailPlainBrokenTo)
if err == nil {
t.Error("EML with broken TO was supposed to fail, but didn't")
}
}
func TestEMLToMsgFromStringNoBoundary(t *testing.T) {
_, err := EMLToMsgFromString(exampleMailPlainB64WithAttachmentNoBoundary)
if err == nil {
t.Error("EML with no boundary was supposed to fail, but didn't")
}
}
func TestEMLToMsgFromStringWithAttachment(t *testing.T) {
wantSubject := "Example mail // plain text base64 with attachment"
msg, err := EMLToMsgFromString(exampleMailPlainB64WithAttachment)
if err != nil {
t.Errorf("EML with attachment failed: %s", err)
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], wantSubject) {
t.Errorf("EMLToMsgFromString of EML with attachment failed: expected subject: %s, but got: %s",
wantSubject, subject[0])
}
if len(msg.attachments) != 1 {
t.Errorf("EMLToMsgFromString of EML with attachment failed: expected no. of attachments: %d, but got: %d",
1, len(msg.attachments))
}
}
func TestEMLToMsgFromStringWithEmbed(t *testing.T) {
wantSubject := "Example mail // plain text base64 with embed"
msg, err := EMLToMsgFromString(exampleMailPlainB64WithEmbed)
if err != nil {
t.Errorf("EML with embed failed: %s", err)
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], wantSubject) {
t.Errorf("EMLToMsgFromString of EML with embed failed: expected subject: %s, but got: %s",
wantSubject, subject[0])
}
if len(msg.embeds) != 1 {
t.Errorf("EMLToMsgFromString of EML with embed failed: expected no. of embeds: %d, but got: %d",
1, len(msg.embeds))
}
msg, err = EMLToMsgFromString(exampleMailPlainB64WithEmbedNoContentID)
if err != nil {
t.Errorf("EML with embed failed: %s", err)
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], wantSubject) {
t.Errorf("EMLToMsgFromString of EML with embed failed: expected subject: %s, but got: %s",
wantSubject, subject[0])
}
if len(msg.embeds) != 1 {
t.Errorf("EMLToMsgFromString of EML with embed failed: expected no. of embeds: %d, but got: %d",
1, len(msg.embeds))
}
}
func TestEMLToMsgFromStringMultipartMixedAlternativeRelated(t *testing.T) {
wantSubject := "Example mail // plain text base64 with attachment, embed and alternative part"
msg, err := EMLToMsgFromString(exampleMailMultipartMixedAlternativeRelated)
if err != nil {
t.Errorf("EML multipart mixed, related, alternative failed: %s", err)
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], wantSubject) {
t.Errorf("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected subject: %s,"+
" but got: %s", wantSubject, subject[0])
}
if len(msg.embeds) != 1 {
t.Errorf("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected no. of "+
"embeds: %d, but got: %d", 1, len(msg.embeds))
}
if len(msg.attachments) != 1 {
t.Errorf("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected no. of "+
"attachments: %d, but got: %d", 1, len(msg.attachments))
}
if len(msg.parts) != 3 {
t.Errorf("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected no. of "+
"parts: %d, but got: %d", 3, len(msg.parts))
}
var hasPlain, hasHTML, hasAlternative bool
for _, part := range msg.parts {
if strings.EqualFold(part.contentType.String(), TypeMultipartAlternative.String()) {
hasAlternative = true
}
if strings.EqualFold(part.contentType.String(), TypeTextPlain.String()) {
hasPlain = true
}
if strings.EqualFold(part.contentType.String(), TypeTextHTML.String()) {
hasHTML = true
}
}
if !hasPlain {
t.Error("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected PLAIN " +
"but got none")
}
if !hasHTML {
t.Error("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected HTML " +
"but got none")
}
if !hasAlternative {
t.Error("EMLToMsgFromString of EML multipart mixed, related, alternative failed: expected Alternative " +
"but got none")
}
}
func TestEMLToMsgFromStringMultipartMixedWith7Bit(t *testing.T) {
wantSubject := "Example mail // 7bit with base64 attachment"
msg, err := EMLToMsgFromString(exampleMultiPart7BitBase64)
if err != nil {
t.Errorf("EML multipart mixed with 7bit: %s", err)
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], wantSubject) {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 7bit: expected subject: %s,"+
" but got: %s", wantSubject, subject[0])
}
if len(msg.parts) != 1 {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 7bit failed: expected 1 part, got: %d",
len(msg.parts))
return
}
if !strings.EqualFold(msg.parts[0].GetEncoding().String(), EncodingUSASCII.String()) {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 7bit failed: expected encoding: %s, got %s",
EncodingUSASCII.String(), msg.parts[0].GetEncoding().String())
}
if len(msg.attachments) != 1 {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 7bit failed: expected 1 attachment, got: %d",
len(msg.attachments))
return
}
}
func TestEMLToMsgFromStringMultipartMixedWith8Bit(t *testing.T) {
wantSubject := "Example mail // 8bit with base64 attachment"
msg, err := EMLToMsgFromString(exampleMultiPart8BitBase64)
if err != nil {
t.Errorf("EML multipart mixed with 8bit: %s", err)
}
if subject := msg.GetGenHeader(HeaderSubject); len(subject) > 0 && !strings.EqualFold(subject[0], wantSubject) {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 8bit: expected subject: %s,"+
" but got: %s", wantSubject, subject[0])
}
if len(msg.parts) != 1 {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 8bit failed: expected 1 part, got: %d",
len(msg.parts))
return
}
if !strings.EqualFold(msg.parts[0].GetEncoding().String(), NoEncoding.String()) {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 8bit failed: expected encoding: %s, got %s",
NoEncoding.String(), msg.parts[0].GetEncoding().String())
}
if len(msg.attachments) != 1 {
t.Errorf("EMLToMsgFromString of EML multipart mixed with 8bit failed: expected 1 attachment, got: %d",
len(msg.attachments))
return
}
}
// stringToTempFile is a helper method that will create a temporary file form a give data string
func stringToTempFile(data, name string) (string, string, error) {
tempDir, err := os.MkdirTemp("", fmt.Sprintf("*-%s", name))
if err != nil {
return tempDir, "", fmt.Errorf("failed to create temp dir: %w", err)
}
filePath := fmt.Sprintf("%s/%s", tempDir, name)
err = os.WriteFile(filePath, []byte(data), 0o666)
if err != nil {
return tempDir, "", fmt.Errorf("failed to write data to temp file: %w", err)
}
return tempDir, filePath, nil
}
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