// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors // // SPDX-License-Identifier: MIT package mail import ( "bytes" "fmt" "os" "strings" "testing" "time" ) const ( // RFC 5322 example mail // See: https://datatracker.ietf.org/doc/html/rfc5322#appendix-A.1.1 exampleMailRFC5322A11 = `From: John Doe To: Mary Smith Subject: Saying Hello Date: Fri, 21 Nov 1997 09:55:06 -0600 Message-ID: <1234@local.machine.example> This is a message just to say hello. So, "Hello".` 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" To: Cc: 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" To: Cc: 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" To: Cc: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 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" To: Cc: 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" To: Cc: 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: Cc: 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" To: go-mail+test.go-mail.dev> Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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" To: Cc: 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: 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" To: Cc: 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" To: Cc: 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 RGVhciBDdXN0b21lciwKCkdvb2QgbmV3cyEgWW91ciBvcmRlciBpcyBvbiB0aGUgd2F5IGFuZCBp bnZvaWNlIGlzIGF0dGFjaGVkIQoKWW91IHdpbGwgZmluZCB5b3VyIHRyYWNraW5nIG51bWJlciBv biB0aGUgaW52b2ljZS4gVHJhY2tpbmcgZGF0YSBtYXkgdGFrZQp1cCB0byAyNCBob3VycyB0byBi ZSBhY2Nlc3NpYmxlIG9ubGluZS4KCuKAoiBQbGVhc2UgcmVtaXQgcGF5bWVudCBhdCB5b3VyIGVh cmxpZXN0IGNvbnZlbmllbmNlIHVubGVzcyBpbnZvaWNlIGlzCm1hcmtlZCDigJxQQUlE4oCdLgri gKIgU29tZSBpdGVtcyBtYXkgc2hpcCBzZXBhcmF0ZWx5IGZyb20gbXVsdGlwbGUgbG9jYXRpb25z LiBTZXBhcmF0ZQppbnZvaWNlcyB3aWxsIGJlIGlzc3VlZCB3aGVuIGFwcGxpY2FibGUuCuKAoiBQ TEVBU0UgSU5TUEVDVCBVUE9OIFJFQ0VJUFQgRk9SIFBBVFRFUk4sIENPTE9SLCBERUZFQ1RTLCBE QU1BR0UgRlJPTQpTSElQUElORywgQ09SUkVDVCBZQVJEQUdFLCBFVEMhIE9uY2UgYW4gb3JkZXIg aXMgY3V0IG9yIHNld24sIG5vIHJldHVybnMKd2lsbCBiZSBhY2NlcHRlZCBmb3IgYW55IHJlYXNv biwgbm8gbWF0dGVyIHRoZSBwYXJ0eSBpbiBlcnJvci4gTm8gcmV0dXJucwp3aWxsIGJlIGF1dGhv cml6ZWQgYWZ0ZXIgMzAgZGF5cyBvZiBpbnZvaWNlIGRhdGUuIE5vIGV4Y2VwdGlvbnMgd2lsbCBi ZQptYWRlLgoKVGhhbmsgeW91ciBmb3IgeW91ciBidXNpbmVzcyEKCk5haWxkb2N0b3IgRmFicmlj cw== --cbace12de35ef4eae53fd974ccd41cb2aee4f9c9c76057ec8bfdd0c97813 Content-Transfer-Encoding: base64 Content-Type: text/html; 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filename="attachment.png" Content-Transfer-Encoding: base64 Content-Type: image/png; name="attachment.png" iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAAAAACoWZBhAAAFEmlUWHRYTUw6Y29tLmFkb2JlLnht cAAAAAAAPD94cGFja2V0IGJlZ2luPSLvu78iIGlkPSJXNU0wTXBDZWhpSHpyZVN6TlRjemtjOWQi Pz4KPHg6eG1wbWV0YSB4bWxuczp4PSJhZG9iZTpuczptZXRhLyIgeDp4bXB0az0iWE1QIENvcmUg NS41LjAiPgogPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIy LXJkZi1zeW50YXgtbnMjIj4KICA8cmRmOkRlc2NyaXB0aW9uIHJkZjphYm91dD0iIgogICAgeG1s bnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvIgogICAgeG1sbnM6cGhvdG9zaG9w PSJodHRwOi8vbnMuYWRvYmUuY29tL3Bob3Rvc2hvcC8xLjAvIgogICAgeG1sbnM6ZXhpZj0iaHR0 cDovL25zLmFkb2JlLmNvbS9leGlmLzEuMC8iCiAgICB4bWxuczp0aWZmPSJodHRwOi8vbnMuYWRv YmUuY29tL3RpZmYvMS4wLyIKICAgIHhtbG5zOnhtcE1NPSJodHRwOi8vbnMuYWRvYmUuY29tL3hh cC8xLjAvbW0vIgogICAgeG1sbnM6c3RFdnQ9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9z VHlwZS9SZXNvdXJjZUV2ZW50IyIKICAgeG1wOkNyZWF0ZURhdGU9IjIwMjQtMDYtMjhUMTM6MjY6 MDYrMDIwMCIKICAgeG1wOk1vZGlmeURhdGU9IjIwMjQtMDYtMjhUMTM6Mjc6MDgrMDI6MDAiCiAg IHhtcDpNZXRhZGF0YURhdGU9IjIwMjQtMDYtMjhUMTM6Mjc6MDgrMDI6MDAiCiAgIHBob3Rvc2hv cDpEYXRlQ3JlYXRlZD0iMjAyNC0wNi0yOFQxMzoyNjowNiswMjAwIgogICBwaG90b3Nob3A6Q29s b3JNb2RlPSIxIgogICBwaG90b3Nob3A6SUNDUHJvZmlsZT0iR3JleXNjYWxlIEQ1MCIKICAgZXhp ZjpQaXhlbFhEaW1lbnNpb249IjEwIgogICBleGlmOlBpeGVsWURpbWVuc2lvbj0iMTAiCiAgIGV4 aWY6Q29sb3JTcGFjZT0iNjU1MzUiCiAgIHRpZmY6SW1hZ2VXaWR0aD0iMTAiCiAgIHRpZmY6SW1h Z2VMZW5ndGg9IjEwIgogICB0aWZmOlJlc29sdXRpb25Vbml0PSIyIgogICB0aWZmOlhSZXNvbHV0 aW9uPSI3Mi8xIgogICB0aWZmOllSZXNvbHV0aW9uPSI3Mi8xIj4KICAgPHhtcE1NOkhpc3Rvcnk+ CiAgICA8cmRmOlNlcT4KICAgICA8cmRmOmxpCiAgICAgIHN0RXZ0OmFjdGlvbj0icHJvZHVjZWQi CiAgICAgIHN0RXZ0OnNvZnR3YXJlQWdlbnQ9IkFmZmluaXR5IFBob3RvIDIgMi4zLjAiCiAgICAg IHN0RXZ0OndoZW49IjIwMjQtMDYtMjhUMTM6Mjc6MDgrMDI6MDAiLz4KICAgIDwvcmRmOlNlcT4K ICAgPC94bXBNTTpIaXN0b3J5PgogIDwvcmRmOkRlc2NyaXB0aW9uPgogPC9yZGY6UkRGPgo8L3g6 eG1wbWV0YT4KPD94cGFja2V0IGVuZD0iciI/PpwIGG4AAADdaUNDUEdyZXlzY2FsZSBENTAAABiV dVC9CsJAGEul6KCDg4vSoQ+gIIjiKoou6qAVrLiUs/5gq8e1In0v30TwGRycnc0VcRD9IJdwfMmR A4xlIMLIrAPhIVaDSceduws7d0cWFvIow/JEJEfTvoO/87zB0Hyt6az/ez/HXPmRIF+IlpAqJj+I 4TmW1EaburR3Jl3qIXUxDE7i7dWvFvzDbEquEBYGUPCRIIKAh4DaRg9N6H6/ffXUN8aRm4KnpFth hw22iFHl7YlpOmedZvtMTfQffXeXnvI+rTKNxguyvDKvB7U4qQAAAAlwSFlzAAALEwAACxMBAJqc GAAAABFJREFUCJljnMoAA0wMNGcCAEQrAKk9oHKhAAAAAElFTkSuQmCC --fe785e0384e2607697cc2ecb17cce003003bb7ca9112104f3e8ce727edb5--` 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" To: Cc: 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" To: Cc: 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 }{ { "RFC5322 A1.1", exampleMailRFC5322A11, "7bit", "Saying Hello", }, { "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(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(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 }