parsemail_test.go - gomodules/forks/parsemail - Gitiles

 package parsemail

 import (
 	"encoding/base64"
 	"io/ioutil"
 	"net/mail"
 	"strings"
 	"testing"
 	"time"
 )

 func TestParseEmail(t *testing.T) {
 	var testData = map[int]struct {
 		mailData string

 		contentType     string
 		content         string
 		subject         string
 		date            time.Time
 		from            []mail.Address
 		sender          mail.Address
 		to              []mail.Address
 		replyTo         []mail.Address
 		cc              []mail.Address
 		bcc             []mail.Address
 		messageID       string
 		resentDate      time.Time
 		resentFrom      []mail.Address
 		resentSender    mail.Address
 		resentTo        []mail.Address
 		resentReplyTo   []mail.Address
 		resentCc        []mail.Address
 		resentBcc       []mail.Address
 		resentMessageID string
 		inReplyTo       []string
 		references      []string
 		htmlBody        string
 		textBody        string
 		attachments     []attachmentData
 		embeddedFiles   []embeddedFileData
 		headerCheck     func(mail.Header, *testing.T)
 	}{
 		1: {
 			mailData: rfc5322exampleA11,
 			subject:  "Saying Hello",
 			from: []mail.Address{
 				{
 					Name:    "John Doe",
 					Address: "jdoe@machine.example",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "Mary Smith",
 					Address: "mary@example.net",
 				},
 			},
 			sender: mail.Address{
 				Name:    "Michael Jones",
 				Address: "mjones@machine.example",
 			},
 			messageID: "1234@local.machine.example",
 			date:      parseDate("Fri, 21 Nov 1997 09:55:06 -0600"),
 			textBody: `This is a message just to say hello.
 So, "Hello".`,
 		},
 		2: {
 			mailData: rfc5322exampleA12,
 			from: []mail.Address{
 				{
 					Name:    "Joe Q. Public",
 					Address: "john.q.public@example.com",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "Mary Smith",
 					Address: "mary@x.test",
 				},
 				{
 					Name:    "",
 					Address: "jdoe@example.org",
 				},
 				{
 					Name:    "Who?",
 					Address: "one@y.test",
 				},
 			},
 			cc: []mail.Address{
 				{
 					Name:    "",
 					Address: "boss@nil.test",
 				},
 				{
 					Name:    "Giant; \"Big\" Box",
 					Address: "sysservices@example.net",
 				},
 			},
 			messageID: "5678.21-Nov-1997@example.com",
 			date:      parseDate("Tue, 01 Jul 2003 10:52:37 +0200"),
 			textBody:  `Hi everyone.`,
 		},
 		3: {
 			mailData: rfc5322exampleA2a,
 			subject:  "Re: Saying Hello",
 			from: []mail.Address{
 				{
 					Name:    "Mary Smith",
 					Address: "mary@example.net",
 				},
 			},
 			replyTo: []mail.Address{
 				{
 					Name:    "Mary Smith: Personal Account",
 					Address: "smith@home.example",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "John Doe",
 					Address: "jdoe@machine.example",
 				},
 			},
 			messageID:  "3456@example.net",
 			inReplyTo:  []string{"1234@local.machine.example"},
 			references: []string{"1234@local.machine.example"},
 			date:       parseDate("Fri, 21 Nov 1997 10:01:10 -0600"),
 			textBody:   `This is a reply to your hello.`,
 		},
 		4: {
 			mailData: rfc5322exampleA2b,
 			subject:  "Re: Saying Hello",
 			from: []mail.Address{
 				{
 					Name:    "John Doe",
 					Address: "jdoe@machine.example",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "Mary Smith: Personal Account",
 					Address: "smith@home.example",
 				},
 			},
 			messageID:  "abcd.1234@local.machine.test",
 			inReplyTo:  []string{"3456@example.net"},
 			references: []string{"1234@local.machine.example", "3456@example.net"},
 			date:       parseDate("Fri, 21 Nov 1997 11:00:00 -0600"),
 			textBody:   `This is a reply to your reply.`,
 		},
 		5: {
 			mailData: rfc5322exampleA3,
 			subject:  "Saying Hello",
 			from: []mail.Address{
 				{
 					Name:    "John Doe",
 					Address: "jdoe@machine.example",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "Mary Smith",
 					Address: "mary@example.net",
 				},
 			},
 			messageID: "1234@local.machine.example",
 			date:      parseDate("Fri, 21 Nov 1997 09:55:06 -0600"),
 			resentFrom: []mail.Address{
 				{
 					Name:    "Mary Smith",
 					Address: "mary@example.net",
 				},
 			},
 			resentTo: []mail.Address{
 				{
 					Name:    "Jane Brown",
 					Address: "j-brown@other.example",
 				},
 			},
 			resentMessageID: "78910@example.net",
 			resentDate:      parseDate("Mon, 24 Nov 1997 14:22:01 -0800"),
 			textBody: `This is a message just to say hello.
 So, "Hello".`,
 		},
 		6: {
 			mailData: data1,
 			contentType: `multipart/mixed; boundary=f403045f1dcc043a44054c8e6bbf`,
 			content: "",
 			subject:  "Peter Paholík",
 			from: []mail.Address{
 				{
 					Name:    "Peter Paholík",
 					Address: "peter.paholik@gmail.com",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "",
 					Address: "dusan@kasan.sk",
 				},
 			},
 			messageID: "CACtgX4kNXE7T5XKSKeH_zEcfUUmf2vXVASxYjaaK9cCn-3zb_g@mail.gmail.com",
 			date:      parseDate("Fri, 07 Apr 2017 09:17:26 +0200"),
 			htmlBody:  "<div dir=\"ltr\"><br></div>",
 			attachments: []attachmentData{
 				{
 					filename:    "Peter Paholík 1 4 2017 2017-04-07.pdf",
 					contentType: "application/pdf",
 					base64data:  "JVBERi0xLjQNCiW1tbW1DQoxIDAgb2JqDQo8PC9UeXBlL0NhdGFsb2cvUGFnZXMgMiAwIFIvTGFuZyhlbi1VUykgL1N0cnVjdFRyZWVSb290IDY3IDAgUi9NYXJrSW5mbzw8L01hcmtlZCB0cnVlPj4vT3V0cHV0SW50ZW50c1s8PC9UeXBlL091dHB1dEludGVudC9TL0dUU19QREZBMS9PdXRwdXRDb25kZXYgMzk1MzYyDQo+Pg0Kc3RhcnR4cmVmDQo0MTk4ODUNCiUlRU9GDQo=",
 				},
 			},
 		},
 		7: {
 			mailData: data2,
 			contentType: `multipart/alternative; boundary="------------C70C0458A558E585ACB75FB4"`,
 			content: "",
 			subject:  "Re: Test Subject 2",
 			from: []mail.Address{
 				{
 					Name:    "Sender Man",
 					Address: "sender@domain.com",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "",
 					Address: "info@receiver.com",
 				},
 			},
 			cc: []mail.Address{
 				{
 					Name:    "Cc Man",
 					Address: "ccman@gmail.com",
 				},
 			},
 			messageID:  "0e9a21b4-01dc-e5c1-dcd6-58ce5aa61f4f@receiver.com",
 			inReplyTo:  []string{"9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@receiver.eu"},
 			references: []string{"2f6b7595-c01e-46e5-42bc-f263e1c4282d@receiver.com", "9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@domain.com"},
 			date:       parseDate("Fri, 07 Apr 2017 12:59:55 +0200"),
 			htmlBody:   `<html>data<img src="part2.9599C449.04E5EC81@develhell.com"/></html>`,
 			textBody: `First level
 > Second level
 >> Third level
 >
 `,
 			embeddedFiles: []embeddedFileData{
 				{
 					cid:         "part2.9599C449.04E5EC81@develhell.com",
 					contentType: "image/png",
 					base64data:  "iVBORw0KGgoAAAANSUhEUgAAAQEAAAAYCAIAAAB1IN9NAAAACXBIWXMAAAsTAAALEwEAmpwYYKUKF+Os3baUndC0pDnwNAmLy1SUr2Gw0luxQuV/AwC6cEhVV5VRrwAAAABJRU5ErkJggg==",
 				},
 			},
 		},
 		8: {
 			mailData: imageContentExample,
 			subject:  "Saying Hello",
 			from: []mail.Address{
 				{
 					Name:    "John Doe",
 					Address: "jdoe@machine.example",
 				},
 			},
 			to: []mail.Address{
 				{
 					Name:    "Mary Smith",
 					Address: "mary@example.net",
 				},
 			},
 			sender: mail.Address{
 				Name:    "Michael Jones",
 				Address: "mjones@machine.example",
 			},
 			messageID: "1234@local.machine.example",
 			date:      parseDate("Fri, 21 Nov 1997 09:55:06 -0600"),
 			contentType: `image/jpeg; x-unix-mode=0644; name="image.gif"`,
 			content: `GIF89a;`,
 		},
 	}

 	for index, td := range testData {
 		e, err := Parse(strings.NewReader(td.mailData))
 		if err != nil {
 			t.Error(err)
 		}

 		if td.contentType != e.ContentType {
 			t.Errorf("[Test Case %v] Wrong content type. Expected: %s, Got: %s", index, td.contentType, e.ContentType)
 		}

 		if td.content != "" {
 			b, err := ioutil.ReadAll(e.Content)
 			if err != nil {
 				t.Error(err)
 			} else if td.content != string(b) {
 				t.Errorf("[Test Case %v] Wrong content. Expected: %s, Got: %s", index, td.content, string(b))
 			}
 		}

 		if td.subject != e.Subject {
 			t.Errorf("[Test Case %v] Wrong subject. Expected: %s, Got: %s", index, td.subject, e.Subject)
 		}

 		if td.messageID != e.MessageID {
 			t.Errorf("[Test Case %v] Wrong messageID. Expected: '%s', Got: '%s'", index, td.messageID, e.MessageID)
 		}

 		if !td.date.Equal(e.Date) {
 			t.Errorf("[Test Case %v] Wrong date. Expected: %v, Got: %v", index, td.date, e.Date)
 		}

 		d := dereferenceAddressList(e.From)
 		if !assertAddressListEq(td.from, d) {
 			t.Errorf("[Test Case %v] Wrong from. Expected: %s, Got: %s", index, td.from, d)
 		}

 		var sender mail.Address
 		if e.Sender != nil {
 			sender = *e.Sender
 		}
 		if td.sender != sender {
 			t.Errorf("[Test Case %v] Wrong sender. Expected: %s, Got: %s", index, td.sender, sender)
 		}

 		d = dereferenceAddressList(e.To)
 		if !assertAddressListEq(td.to, d) {
 			t.Errorf("[Test Case %v] Wrong to. Expected: %s, Got: %s", index, td.to, d)
 		}

 		d = dereferenceAddressList(e.Cc)
 		if !assertAddressListEq(td.cc, d) {
 			t.Errorf("[Test Case %v] Wrong cc. Expected: %s, Got: %s", index, td.cc, d)
 		}

 		d = dereferenceAddressList(e.Bcc)
 		if !assertAddressListEq(td.bcc, d) {
 			t.Errorf("[Test Case %v] Wrong bcc. Expected: %s, Got: %s", index, td.bcc, d)
 		}

 		if td.resentMessageID != e.ResentMessageID {
 			t.Errorf("[Test Case %v] Wrong resent messageID. Expected: '%s', Got: '%s'", index, td.resentMessageID, e.ResentMessageID)
 		}

 		if !td.resentDate.Equal(e.ResentDate) && !td.resentDate.IsZero() && !e.ResentDate.IsZero() {
 			t.Errorf("[Test Case %v] Wrong resent date. Expected: %v, Got: %v", index, td.resentDate, e.ResentDate)
 		}

 		d = dereferenceAddressList(e.ResentFrom)
 		if !assertAddressListEq(td.resentFrom, d) {
 			t.Errorf("[Test Case %v] Wrong resent from. Expected: %s, Got: %s", index, td.resentFrom, d)
 		}

 		var resentSender mail.Address
 		if e.ResentSender != nil {
 			resentSender = *e.ResentSender
 		}
 		if td.resentSender != resentSender {
 			t.Errorf("[Test Case %v] Wrong resent sender. Expected: %s, Got: %s", index, td.resentSender, resentSender)
 		}

 		d = dereferenceAddressList(e.ResentTo)
 		if !assertAddressListEq(td.resentTo, d) {
 			t.Errorf("[Test Case %v] Wrong resent to. Expected: %s, Got: %s", index, td.resentTo, d)
 		}

 		d = dereferenceAddressList(e.ResentCc)
 		if !assertAddressListEq(td.resentCc, d) {
 			t.Errorf("[Test Case %v] Wrong resent cc. Expected: %s, Got: %s", index, td.resentCc, d)
 		}

 		d = dereferenceAddressList(e.ResentBcc)
 		if !assertAddressListEq(td.resentBcc, d) {
 			t.Errorf("[Test Case %v] Wrong resent bcc. Expected: %s, Got: %s", index, td.resentBcc, d)
 		}

 		if !assertSliceEq(td.inReplyTo, e.InReplyTo) {
 			t.Errorf("[Test Case %v] Wrong in reply to. Expected: %s, Got: %s", index, td.inReplyTo, e.InReplyTo)
 		}

 		if !assertSliceEq(td.references, e.References) {
 			t.Errorf("[Test Case %v] Wrong references. Expected: %s, Got: %s", index, td.references, e.References)
 		}

 		d = dereferenceAddressList(e.ReplyTo)
 		if !assertAddressListEq(td.replyTo, d) {
 			t.Errorf("[Test Case %v] Wrong reply to. Expected: %s, Got: %s", index, td.replyTo, d)
 		}

 		if td.htmlBody != e.HTMLBody {
 			t.Errorf("[Test Case %v] Wrong html body. Expected: '%s', Got: '%s'", index, td.htmlBody, e.HTMLBody)
 		}

 		if td.textBody != e.TextBody {
 			t.Errorf("[Test Case %v] Wrong text body. Expected: '%s', Got: '%s'", index, td.textBody, e.TextBody)
 		}

 		if len(td.attachments) != len(e.Attachments) {
 			t.Errorf("[Test Case %v] Incorrect number of attachments! Expected: %v, Got: %v.", index, len(td.attachments), len(e.Attachments))
 		} else {
 			attachs := e.Attachments[:]

 			for _, ad := range td.attachments {
 				found := false

 				for i, ra := range attachs {
 					b, err := ioutil.ReadAll(ra.Data)
 					if err != nil {
 						t.Error(err)
 					}

 					encoded := base64.StdEncoding.EncodeToString(b)
 					if ra.Filename == ad.filename && encoded == ad.base64data && ra.ContentType == ad.contentType {
 						found = true
 						attachs = append(attachs[:i], attachs[i+1:]...)
 					}
 				}

 				if !found {
 					t.Errorf("[Test Case %v] Attachment not found: %s", index, ad.filename)
 				}
 			}

 			if len(attachs) != 0 {
 				t.Errorf("[Test Case %v] Email contains %v unexpected attachments: %v", index, len(attachs), attachs)
 			}
 		}

 		if len(td.embeddedFiles) != len(e.EmbeddedFiles) {
 			t.Errorf("[Test Case %v] Incorrect number of embedded files! Expected: %v, Got: %v.", index, len(td.embeddedFiles), len(e.EmbeddedFiles))
 		} else {
 			embeds := e.EmbeddedFiles[:]

 			for _, ad := range td.embeddedFiles {
 				found := false

 				for i, ra := range embeds {
 					b, err := ioutil.ReadAll(ra.Data)
 					if err != nil {
 						t.Error(err)
 					}

 					encoded := base64.StdEncoding.EncodeToString(b)

 					if ra.CID == ad.cid && encoded == ad.base64data && ra.ContentType == ad.contentType {
 						found = true
 						embeds = append(embeds[:i], embeds[i+1:]...)
 					}
 				}

 				if !found {
 					t.Errorf("[Test Case %v] Embedded file not found: %s", index, ad.cid)
 				}
 			}

 			if len(embeds) != 0 {
 				t.Errorf("[Test Case %v] Email contains %v unexpected embedded files: %v", index, len(embeds), embeds)
 			}
 		}
 	}
 }

 func parseDate(in string) time.Time {
 	out, err := time.Parse(time.RFC1123Z, in)
 	if err != nil {
 		panic(err)
 	}

 	return out
 }

 type attachmentData struct {
 	filename    string
 	contentType string
 	base64data  string
 }

 type embeddedFileData struct {
 	cid         string
 	contentType string
 	base64data  string
 }

 func assertSliceEq(a, b []string) bool {
 	if len(a) == len(b) && len(a) == 0 {
 		return true
 	}

 	if a == nil && b == nil {
 		return true
 	}

 	if a == nil || b == nil {
 		return false
 	}

 	if len(a) != len(b) {
 		return false
 	}

 	for i := range a {
 		if a[i] != b[i] {
 			return false
 		}
 	}

 	return true
 }

 func assertAddressListEq(a, b []mail.Address) bool {
 	if len(a) == len(b) && len(a) == 0 {
 		return true
 	}

 	if a == nil && b == nil {
 		return true
 	}

 	if a == nil || b == nil {
 		return false
 	}

 	if len(a) != len(b) {
 		return false
 	}

 	for i := range a {
 		if a[i] != b[i] {
 			return false
 		}
 	}

 	return true
 }

 func dereferenceAddressList(al []*mail.Address) (result []mail.Address) {
 	for _, a := range al {
 		result = append(result, *a)
 	}

 	return
 }

 var data1 = `From: =?UTF-8?Q?Peter_Pahol=C3=ADk?= <peter.paholik@gmail.com>
 Date: Fri, 7 Apr 2017 09:17:26 +0200
 Message-ID: <CACtgX4kNXE7T5XKSKeH_zEcfUUmf2vXVASxYjaaK9cCn-3zb_g@mail.gmail.com>
 Subject: =?UTF-8?Q?Peter_Pahol=C3=ADk?=
 To: dusan@kasan.sk
 Content-Type: multipart/mixed; boundary=f403045f1dcc043a44054c8e6bbf

 --f403045f1dcc043a44054c8e6bbf
 Content-Type: multipart/alternative; boundary=f403045f1dcc043a3f054c8e6bbd

 --f403045f1dcc043a3f054c8e6bbd
 Content-Type: text/plain; charset=UTF-8


 --f403045f1dcc043a3f054c8e6bbd
 Content-Type: text/html; charset=UTF-8

 <div dir="ltr"><br></div>

 --f403045f1dcc043a3f054c8e6bbd--
 --f403045f1dcc043a44054c8e6bbf
 Content-Type: application/pdf;
 	name="=?UTF-8?Q?Peter_Paholi=CC=81k_1?=
 	=?UTF-8?Q?_4_2017_2017=2D04=2D07=2Epdf?="
 Content-Disposition: attachment;
 	filename="=?UTF-8?Q?Peter_Paholi=CC=81k_1?=
 	=?UTF-8?Q?_4_2017_2017=2D04=2D07=2Epdf?="
 Content-Transfer-Encoding: base64
 X-Attachment-Id: f_j17i0f0d0

 JVBERi0xLjQNCiW1tbW1DQoxIDAgb2JqDQo8PC9UeXBlL0NhdGFsb2cvUGFnZXMgMiAwIFIvTGFu
 Zyhlbi1VUykgL1N0cnVjdFRyZWVSb290IDY3IDAgUi9NYXJrSW5mbzw8L01hcmtlZCB0cnVlPj4v
 T3V0cHV0SW50ZW50c1s8PC9UeXBlL091dHB1dEludGVudC9TL0dUU19QREZBMS9PdXRwdXRDb25k
 ZXYgMzk1MzYyDQo+Pg0Kc3RhcnR4cmVmDQo0MTk4ODUNCiUlRU9GDQo=
 --f403045f1dcc043a44054c8e6bbf--
 `

 var data2 = `Subject: Re: Test Subject 2
 To: info@receiver.com
 References: <2f6b7595-c01e-46e5-42bc-f263e1c4282d@receiver.com>
  <9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@domain.com>
 Cc: Cc Man <ccman@gmail.com>
 From: Sender Man <sender@domain.com>
 Message-ID: <0e9a21b4-01dc-e5c1-dcd6-58ce5aa61f4f@receiver.com>
 Date: Fri, 7 Apr 2017 12:59:55 +0200
 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0)
  Gecko/20100101 Thunderbird/45.8.0
 MIME-Version: 1.0
 In-Reply-To: <9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@receiver.eu>
 Content-Type: multipart/alternative;
  boundary="------------C70C0458A558E585ACB75FB4"

 This is a multi-part message in MIME format.
 --------------C70C0458A558E585ACB75FB4
 Content-Type: text/plain; charset=utf-8; format=flowed
 Content-Transfer-Encoding: 8bit

 First level
 > Second level
 >> Third level
 >


 --------------C70C0458A558E585ACB75FB4
 Content-Type: multipart/related;
  boundary="------------5DB4A1356834BB602A5F88B2"


 --------------5DB4A1356834BB602A5F88B2
 Content-Type: text/html; charset=utf-8
 Content-Transfer-Encoding: 8bit

 <html>data<img src="part2.9599C449.04E5EC81@develhell.com"/></html>

 --------------5DB4A1356834BB602A5F88B2
 Content-Type: image/png
 Content-Transfer-Encoding: base64
 Content-ID: <part2.9599C449.04E5EC81@develhell.com>

 iVBORw0KGgoAAAANSUhEUgAAAQEAAAAYCAIAAAB1IN9NAAAACXBIWXMAAAsTAAALEwEAmpwY
 YKUKF+Os3baUndC0pDnwNAmLy1SUr2Gw0luxQuV/AwC6cEhVV5VRrwAAAABJRU5ErkJggg==
 --------------5DB4A1356834BB602A5F88B2

 --------------C70C0458A558E585ACB75FB4--
 `

 var rfc5322exampleA11 = `From: John Doe <jdoe@machine.example>
 Sender: Michael Jones <mjones@machine.example>
 To: Mary Smith <mary@example.net>
 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".
 `

 var rfc5322exampleA12 = `From: "Joe Q. Public" <john.q.public@example.com>
 To: Mary Smith <mary@x.test>, jdoe@example.org, Who? <one@y.test>
 Cc: <boss@nil.test>, "Giant; \"Big\" Box" <sysservices@example.net>
 Date: Tue, 1 Jul 2003 10:52:37 +0200
 Message-ID: <5678.21-Nov-1997@example.com>

 Hi everyone.
 `

 //todo: not yet implemented in net/mail
 //once there is support for this, add it
 var rfc5322exampleA13 = `From: Pete <pete@silly.example>
 To: A Group:Ed Jones <c@a.test>,joe@where.test,John <jdoe@one.test>;
 Cc: Undisclosed recipients:;
 Date: Thu, 13 Feb 1969 23:32:54 -0330
 Message-ID: <testabcd.1234@silly.example>

 Testing.
 `

 //we skipped the first message bcause it's the same as A 1.1
 var rfc5322exampleA2a = `From: Mary Smith <mary@example.net>
 To: John Doe <jdoe@machine.example>
 Reply-To: "Mary Smith: Personal Account" <smith@home.example>
 Subject: Re: Saying Hello
 Date: Fri, 21 Nov 1997 10:01:10 -0600
 Message-ID: <3456@example.net>
 In-Reply-To: <1234@local.machine.example>
 References: <1234@local.machine.example>

 This is a reply to your hello.
 `

 var rfc5322exampleA2b = `To: "Mary Smith: Personal Account" <smith@home.example>
 From: John Doe <jdoe@machine.example>
 Subject: Re: Saying Hello
 Date: Fri, 21 Nov 1997 11:00:00 -0600
 Message-ID: <abcd.1234@local.machine.test>
 In-Reply-To: <3456@example.net>
 References: <1234@local.machine.example> <3456@example.net>

 This is a reply to your reply.
 `

 var rfc5322exampleA3 = `Resent-From: Mary Smith <mary@example.net>
 Resent-To: Jane Brown <j-brown@other.example>
 Resent-Date: Mon, 24 Nov 1997 14:22:01 -0800
 Resent-Message-ID: <78910@example.net>
 From: John Doe <jdoe@machine.example>
 To: Mary Smith <mary@example.net>
 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".`

 var rfc5322exampleA4 = `Received: from x.y.test
   by example.net
   via TCP
   with ESMTP
   id ABC12345
   for <mary@example.net>;  21 Nov 1997 10:05:43 -0600
 Received: from node.example by x.y.test; 21 Nov 1997 10:01:22 -0600
 From: John Doe <jdoe@node.example>
 To: Mary Smith <mary@example.net>
 Subject: Saying Hello
 Date: Fri, 21 Nov 1997 09:55:06 -0600
 Message-ID: <1234@local.node.example>

 This is a message just to say hello.
 So, "Hello".`

 var imageContentExample = `From: John Doe <jdoe@machine.example>
 Sender: Michael Jones <mjones@machine.example>
 To: Mary Smith <mary@example.net>
 Subject: Saying Hello
 Date: Fri, 21 Nov 1997 09:55:06 -0600
 Message-ID: <1234@local.machine.example>
 Content-Type: image/jpeg;
 	x-unix-mode=0644;
 	name="image.gif"
 Content-Transfer-Encoding: base64

 R0lGODlhAQE7`
	package parsemail

	import (
	"encoding/base64"
	"io/ioutil"
	"net/mail"
	"strings"
	"testing"
	"time"
	)

	func TestParseEmail(t *testing.T) {
	var testData = map[int]struct {
	mailData string

	contentType string
	content string
	subject string
	date time.Time
	from []mail.Address
	sender mail.Address
	to []mail.Address
	replyTo []mail.Address
	cc []mail.Address
	bcc []mail.Address
	messageID string
	resentDate time.Time
	resentFrom []mail.Address
	resentSender mail.Address
	resentTo []mail.Address
	resentReplyTo []mail.Address
	resentCc []mail.Address
	resentBcc []mail.Address
	resentMessageID string
	inReplyTo []string
	references []string
	htmlBody string
	textBody string
	attachments []attachmentData
	embeddedFiles []embeddedFileData
	headerCheck func(mail.Header, *testing.T)
	}{
	1: {
	mailData: rfc5322exampleA11,
	subject: "Saying Hello",
	from: []mail.Address{
	{
	Name: "John Doe",
	Address: "jdoe@machine.example",
	},
	},
	to: []mail.Address{
	{
	Name: "Mary Smith",
	Address: "mary@example.net",
	},
	},
	sender: mail.Address{
	Name: "Michael Jones",
	Address: "mjones@machine.example",
	},
	messageID: "1234@local.machine.example",
	date: parseDate("Fri, 21 Nov 1997 09:55:06 -0600"),
	textBody: `This is a message just to say hello.
	So, "Hello".`,
	},
	2: {
	mailData: rfc5322exampleA12,
	from: []mail.Address{
	{
	Name: "Joe Q. Public",
	Address: "john.q.public@example.com",
	},
	},
	to: []mail.Address{
	{
	Name: "Mary Smith",
	Address: "mary@x.test",
	},
	{
	Name: "",
	Address: "jdoe@example.org",
	},
	{
	Name: "Who?",
	Address: "one@y.test",
	},
	},
	cc: []mail.Address{
	{
	Name: "",
	Address: "boss@nil.test",
	},
	{
	Name: "Giant; \"Big\" Box",
	Address: "sysservices@example.net",
	},
	},
	messageID: "5678.21-Nov-1997@example.com",
	date: parseDate("Tue, 01 Jul 2003 10:52:37 +0200"),
	textBody: `Hi everyone.`,
	},
	3: {
	mailData: rfc5322exampleA2a,
	subject: "Re: Saying Hello",
	from: []mail.Address{
	{
	Name: "Mary Smith",
	Address: "mary@example.net",
	},
	},
	replyTo: []mail.Address{
	{
	Name: "Mary Smith: Personal Account",
	Address: "smith@home.example",
	},
	},
	to: []mail.Address{
	{
	Name: "John Doe",
	Address: "jdoe@machine.example",
	},
	},
	messageID: "3456@example.net",
	inReplyTo: []string{"1234@local.machine.example"},
	references: []string{"1234@local.machine.example"},
	date: parseDate("Fri, 21 Nov 1997 10:01:10 -0600"),
	textBody: `This is a reply to your hello.`,
	},
	4: {
	mailData: rfc5322exampleA2b,
	subject: "Re: Saying Hello",
	from: []mail.Address{
	{
	Name: "John Doe",
	Address: "jdoe@machine.example",
	},
	},
	to: []mail.Address{
	{
	Name: "Mary Smith: Personal Account",
	Address: "smith@home.example",
	},
	},
	messageID: "abcd.1234@local.machine.test",
	inReplyTo: []string{"3456@example.net"},
	references: []string{"1234@local.machine.example", "3456@example.net"},
	date: parseDate("Fri, 21 Nov 1997 11:00:00 -0600"),
	textBody: `This is a reply to your reply.`,
	},
	5: {
	mailData: rfc5322exampleA3,
	subject: "Saying Hello",
	from: []mail.Address{
	{
	Name: "John Doe",
	Address: "jdoe@machine.example",
	},
	},
	to: []mail.Address{
	{
	Name: "Mary Smith",
	Address: "mary@example.net",
	},
	},
	messageID: "1234@local.machine.example",
	date: parseDate("Fri, 21 Nov 1997 09:55:06 -0600"),
	resentFrom: []mail.Address{
	{
	Name: "Mary Smith",
	Address: "mary@example.net",
	},
	},
	resentTo: []mail.Address{
	{
	Name: "Jane Brown",
	Address: "j-brown@other.example",
	},
	},
	resentMessageID: "78910@example.net",
	resentDate: parseDate("Mon, 24 Nov 1997 14:22:01 -0800"),
	textBody: `This is a message just to say hello.
	So, "Hello".`,
	},
	6: {
	mailData: data1,
	contentType: `multipart/mixed; boundary=f403045f1dcc043a44054c8e6bbf`,
	content: "",
	subject: "Peter Paholík",
	from: []mail.Address{
	{
	Name: "Peter Paholík",
	Address: "peter.paholik@gmail.com",
	},
	},
	to: []mail.Address{
	{
	Name: "",
	Address: "dusan@kasan.sk",
	},
	},
	messageID: "CACtgX4kNXE7T5XKSKeH_zEcfUUmf2vXVASxYjaaK9cCn-3zb_g@mail.gmail.com",
	date: parseDate("Fri, 07 Apr 2017 09:17:26 +0200"),
	htmlBody: "<div dir=\"ltr\"><br></div>",
	attachments: []attachmentData{
	{
	filename: "Peter Paholík 1 4 2017 2017-04-07.pdf",
	contentType: "application/pdf",
	base64data: "JVBERi0xLjQNCiW1tbW1DQoxIDAgb2JqDQo8PC9UeXBlL0NhdGFsb2cvUGFnZXMgMiAwIFIvTGFuZyhlbi1VUykgL1N0cnVjdFRyZWVSb290IDY3IDAgUi9NYXJrSW5mbzw8L01hcmtlZCB0cnVlPj4vT3V0cHV0SW50ZW50c1s8PC9UeXBlL091dHB1dEludGVudC9TL0dUU19QREZBMS9PdXRwdXRDb25kZXYgMzk1MzYyDQo+Pg0Kc3RhcnR4cmVmDQo0MTk4ODUNCiUlRU9GDQo=",
	},
	},
	},
	7: {
	mailData: data2,
	contentType: `multipart/alternative; boundary="------------C70C0458A558E585ACB75FB4"`,
	content: "",
	subject: "Re: Test Subject 2",
	from: []mail.Address{
	{
	Name: "Sender Man",
	Address: "sender@domain.com",
	},
	},
	to: []mail.Address{
	{
	Name: "",
	Address: "info@receiver.com",
	},
	},
	cc: []mail.Address{
	{
	Name: "Cc Man",
	Address: "ccman@gmail.com",
	},
	},
	messageID: "0e9a21b4-01dc-e5c1-dcd6-58ce5aa61f4f@receiver.com",
	inReplyTo: []string{"9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@receiver.eu"},
	references: []string{"2f6b7595-c01e-46e5-42bc-f263e1c4282d@receiver.com", "9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@domain.com"},
	date: parseDate("Fri, 07 Apr 2017 12:59:55 +0200"),
	htmlBody: `<html>data<img src="part2.9599C449.04E5EC81@develhell.com"/></html>`,
	textBody: `First level
	> Second level
	>> Third level
	>
	`,
	embeddedFiles: []embeddedFileData{
	{
	cid: "part2.9599C449.04E5EC81@develhell.com",
	contentType: "image/png",
	base64data: "iVBORw0KGgoAAAANSUhEUgAAAQEAAAAYCAIAAAB1IN9NAAAACXBIWXMAAAsTAAALEwEAmpwYYKUKF+Os3baUndC0pDnwNAmLy1SUr2Gw0luxQuV/AwC6cEhVV5VRrwAAAABJRU5ErkJggg==",
	},
	},
	},
	8: {
	mailData: imageContentExample,
	subject: "Saying Hello",
	from: []mail.Address{
	{
	Name: "John Doe",
	Address: "jdoe@machine.example",
	},
	},
	to: []mail.Address{
	{
	Name: "Mary Smith",
	Address: "mary@example.net",
	},
	},
	sender: mail.Address{
	Name: "Michael Jones",
	Address: "mjones@machine.example",
	},
	messageID: "1234@local.machine.example",
	date: parseDate("Fri, 21 Nov 1997 09:55:06 -0600"),
	contentType: `image/jpeg; x-unix-mode=0644; name="image.gif"`,
	content: `GIF89a;`,
	},
	}

	for index, td := range testData {
	e, err := Parse(strings.NewReader(td.mailData))
	if err != nil {
	t.Error(err)
	}

	if td.contentType != e.ContentType {
	t.Errorf("[Test Case %v] Wrong content type. Expected: %s, Got: %s", index, td.contentType, e.ContentType)
	}

	if td.content != "" {
	b, err := ioutil.ReadAll(e.Content)
	if err != nil {
	t.Error(err)
	} else if td.content != string(b) {
	t.Errorf("[Test Case %v] Wrong content. Expected: %s, Got: %s", index, td.content, string(b))
	}
	}

	if td.subject != e.Subject {
	t.Errorf("[Test Case %v] Wrong subject. Expected: %s, Got: %s", index, td.subject, e.Subject)
	}

	if td.messageID != e.MessageID {
	t.Errorf("[Test Case %v] Wrong messageID. Expected: '%s', Got: '%s'", index, td.messageID, e.MessageID)
	}

	if !td.date.Equal(e.Date) {
	t.Errorf("[Test Case %v] Wrong date. Expected: %v, Got: %v", index, td.date, e.Date)
	}

	d := dereferenceAddressList(e.From)
	if !assertAddressListEq(td.from, d) {
	t.Errorf("[Test Case %v] Wrong from. Expected: %s, Got: %s", index, td.from, d)
	}

	var sender mail.Address
	if e.Sender != nil {
	sender = *e.Sender
	}
	if td.sender != sender {
	t.Errorf("[Test Case %v] Wrong sender. Expected: %s, Got: %s", index, td.sender, sender)
	}

	d = dereferenceAddressList(e.To)
	if !assertAddressListEq(td.to, d) {
	t.Errorf("[Test Case %v] Wrong to. Expected: %s, Got: %s", index, td.to, d)
	}

	d = dereferenceAddressList(e.Cc)
	if !assertAddressListEq(td.cc, d) {
	t.Errorf("[Test Case %v] Wrong cc. Expected: %s, Got: %s", index, td.cc, d)
	}

	d = dereferenceAddressList(e.Bcc)
	if !assertAddressListEq(td.bcc, d) {
	t.Errorf("[Test Case %v] Wrong bcc. Expected: %s, Got: %s", index, td.bcc, d)
	}

	if td.resentMessageID != e.ResentMessageID {
	t.Errorf("[Test Case %v] Wrong resent messageID. Expected: '%s', Got: '%s'", index, td.resentMessageID, e.ResentMessageID)
	}

	if !td.resentDate.Equal(e.ResentDate) && !td.resentDate.IsZero() && !e.ResentDate.IsZero() {
	t.Errorf("[Test Case %v] Wrong resent date. Expected: %v, Got: %v", index, td.resentDate, e.ResentDate)
	}

	d = dereferenceAddressList(e.ResentFrom)
	if !assertAddressListEq(td.resentFrom, d) {
	t.Errorf("[Test Case %v] Wrong resent from. Expected: %s, Got: %s", index, td.resentFrom, d)
	}

	var resentSender mail.Address
	if e.ResentSender != nil {
	resentSender = *e.ResentSender
	}
	if td.resentSender != resentSender {
	t.Errorf("[Test Case %v] Wrong resent sender. Expected: %s, Got: %s", index, td.resentSender, resentSender)
	}

	d = dereferenceAddressList(e.ResentTo)
	if !assertAddressListEq(td.resentTo, d) {
	t.Errorf("[Test Case %v] Wrong resent to. Expected: %s, Got: %s", index, td.resentTo, d)
	}

	d = dereferenceAddressList(e.ResentCc)
	if !assertAddressListEq(td.resentCc, d) {
	t.Errorf("[Test Case %v] Wrong resent cc. Expected: %s, Got: %s", index, td.resentCc, d)
	}

	d = dereferenceAddressList(e.ResentBcc)
	if !assertAddressListEq(td.resentBcc, d) {
	t.Errorf("[Test Case %v] Wrong resent bcc. Expected: %s, Got: %s", index, td.resentBcc, d)
	}

	if !assertSliceEq(td.inReplyTo, e.InReplyTo) {
	t.Errorf("[Test Case %v] Wrong in reply to. Expected: %s, Got: %s", index, td.inReplyTo, e.InReplyTo)
	}

	if !assertSliceEq(td.references, e.References) {
	t.Errorf("[Test Case %v] Wrong references. Expected: %s, Got: %s", index, td.references, e.References)
	}

	d = dereferenceAddressList(e.ReplyTo)
	if !assertAddressListEq(td.replyTo, d) {
	t.Errorf("[Test Case %v] Wrong reply to. Expected: %s, Got: %s", index, td.replyTo, d)
	}

	if td.htmlBody != e.HTMLBody {
	t.Errorf("[Test Case %v] Wrong html body. Expected: '%s', Got: '%s'", index, td.htmlBody, e.HTMLBody)
	}

	if td.textBody != e.TextBody {
	t.Errorf("[Test Case %v] Wrong text body. Expected: '%s', Got: '%s'", index, td.textBody, e.TextBody)
	}

	if len(td.attachments) != len(e.Attachments) {
	t.Errorf("[Test Case %v] Incorrect number of attachments! Expected: %v, Got: %v.", index, len(td.attachments), len(e.Attachments))
	} else {
	attachs := e.Attachments[:]

	for _, ad := range td.attachments {
	found := false

	for i, ra := range attachs {
	b, err := ioutil.ReadAll(ra.Data)
	if err != nil {
	t.Error(err)
	}

	encoded := base64.StdEncoding.EncodeToString(b)
	if ra.Filename == ad.filename && encoded == ad.base64data && ra.ContentType == ad.contentType {
	found = true
	attachs = append(attachs[:i], attachs[i+1:]...)
	}
	}

	if !found {
	t.Errorf("[Test Case %v] Attachment not found: %s", index, ad.filename)
	}
	}

	if len(attachs) != 0 {
	t.Errorf("[Test Case %v] Email contains %v unexpected attachments: %v", index, len(attachs), attachs)
	}
	}

	if len(td.embeddedFiles) != len(e.EmbeddedFiles) {
	t.Errorf("[Test Case %v] Incorrect number of embedded files! Expected: %v, Got: %v.", index, len(td.embeddedFiles), len(e.EmbeddedFiles))
	} else {
	embeds := e.EmbeddedFiles[:]

	for _, ad := range td.embeddedFiles {
	found := false

	for i, ra := range embeds {
	b, err := ioutil.ReadAll(ra.Data)
	if err != nil {
	t.Error(err)
	}

	encoded := base64.StdEncoding.EncodeToString(b)

	if ra.CID == ad.cid && encoded == ad.base64data && ra.ContentType == ad.contentType {
	found = true
	embeds = append(embeds[:i], embeds[i+1:]...)
	}
	}

	if !found {
	t.Errorf("[Test Case %v] Embedded file not found: %s", index, ad.cid)
	}
	}

	if len(embeds) != 0 {
	t.Errorf("[Test Case %v] Email contains %v unexpected embedded files: %v", index, len(embeds), embeds)
	}
	}
	}
	}

	func parseDate(in string) time.Time {
	out, err := time.Parse(time.RFC1123Z, in)
	if err != nil {
	panic(err)
	}

	return out
	}

	type attachmentData struct {
	filename string
	contentType string
	base64data string
	}

	type embeddedFileData struct {
	cid string
	contentType string
	base64data string
	}

	func assertSliceEq(a, b []string) bool {
	if len(a) == len(b) && len(a) == 0 {
	return true
	}

	if a == nil && b == nil {
	return true
	}

	if a == nil \|\| b == nil {
	return false
	}

	if len(a) != len(b) {
	return false
	}

	for i := range a {
	if a[i] != b[i] {
	return false
	}
	}

	return true
	}

	func assertAddressListEq(a, b []mail.Address) bool {
	if len(a) == len(b) && len(a) == 0 {
	return true
	}

	if a == nil && b == nil {
	return true
	}

	if a == nil \|\| b == nil {
	return false
	}

	if len(a) != len(b) {
	return false
	}

	for i := range a {
	if a[i] != b[i] {
	return false
	}
	}

	return true
	}

	func dereferenceAddressList(al []*mail.Address) (result []mail.Address) {
	for _, a := range al {
	result = append(result, *a)
	}

	return
	}

	var data1 = `From: =?UTF-8?Q?Peter_Pahol=C3=ADk?= <peter.paholik@gmail.com>
	Date: Fri, 7 Apr 2017 09:17:26 +0200
	Message-ID: <CACtgX4kNXE7T5XKSKeH_zEcfUUmf2vXVASxYjaaK9cCn-3zb_g@mail.gmail.com>
	Subject: =?UTF-8?Q?Peter_Pahol=C3=ADk?=
	To: dusan@kasan.sk
	Content-Type: multipart/mixed; boundary=f403045f1dcc043a44054c8e6bbf

	--f403045f1dcc043a44054c8e6bbf
	Content-Type: multipart/alternative; boundary=f403045f1dcc043a3f054c8e6bbd

	--f403045f1dcc043a3f054c8e6bbd
	Content-Type: text/plain; charset=UTF-8



	--f403045f1dcc043a3f054c8e6bbd
	Content-Type: text/html; charset=UTF-8

	<div dir="ltr"><br></div>

	--f403045f1dcc043a3f054c8e6bbd--
	--f403045f1dcc043a44054c8e6bbf
	Content-Type: application/pdf;
	name="=?UTF-8?Q?Peter_Paholi=CC=81k_1?=
	=?UTF-8?Q?_4_2017_2017=2D04=2D07=2Epdf?="
	Content-Disposition: attachment;
	filename="=?UTF-8?Q?Peter_Paholi=CC=81k_1?=
	=?UTF-8?Q?_4_2017_2017=2D04=2D07=2Epdf?="
	Content-Transfer-Encoding: base64
	X-Attachment-Id: f_j17i0f0d0

	JVBERi0xLjQNCiW1tbW1DQoxIDAgb2JqDQo8PC9UeXBlL0NhdGFsb2cvUGFnZXMgMiAwIFIvTGFu
	Zyhlbi1VUykgL1N0cnVjdFRyZWVSb290IDY3IDAgUi9NYXJrSW5mbzw8L01hcmtlZCB0cnVlPj4v
	T3V0cHV0SW50ZW50c1s8PC9UeXBlL091dHB1dEludGVudC9TL0dUU19QREZBMS9PdXRwdXRDb25k
	ZXYgMzk1MzYyDQo+Pg0Kc3RhcnR4cmVmDQo0MTk4ODUNCiUlRU9GDQo=
	--f403045f1dcc043a44054c8e6bbf--
	`

	var data2 = `Subject: Re: Test Subject 2
	To: info@receiver.com
	References: <2f6b7595-c01e-46e5-42bc-f263e1c4282d@receiver.com>
	<9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@domain.com>
	Cc: Cc Man <ccman@gmail.com>
	From: Sender Man <sender@domain.com>
	Message-ID: <0e9a21b4-01dc-e5c1-dcd6-58ce5aa61f4f@receiver.com>
	Date: Fri, 7 Apr 2017 12:59:55 +0200
	User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0)
	Gecko/20100101 Thunderbird/45.8.0
	MIME-Version: 1.0
	In-Reply-To: <9ff38d03-c4ab-89b7-9328-e99d5e24e3ba@receiver.eu>
	Content-Type: multipart/alternative;
	boundary="------------C70C0458A558E585ACB75FB4"

	This is a multi-part message in MIME format.
	--------------C70C0458A558E585ACB75FB4
	Content-Type: text/plain; charset=utf-8; format=flowed
	Content-Transfer-Encoding: 8bit

	First level
	> Second level
	>> Third level
	>


	--------------C70C0458A558E585ACB75FB4
	Content-Type: multipart/related;
	boundary="------------5DB4A1356834BB602A5F88B2"


	--------------5DB4A1356834BB602A5F88B2
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	<html>data<img src="part2.9599C449.04E5EC81@develhell.com"/></html>

	--------------5DB4A1356834BB602A5F88B2
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	iVBORw0KGgoAAAANSUhEUgAAAQEAAAAYCAIAAAB1IN9NAAAACXBIWXMAAAsTAAALEwEAmpwY
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	--------------C70C0458A558E585ACB75FB4--
	`

	var rfc5322exampleA11 = `From: John Doe <jdoe@machine.example>
	Sender: Michael Jones <mjones@machine.example>
	To: Mary Smith <mary@example.net>
	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".
	`

	var rfc5322exampleA12 = `From: "Joe Q. Public" <john.q.public@example.com>
	To: Mary Smith <mary@x.test>, jdoe@example.org, Who? <one@y.test>
	Cc: <boss@nil.test>, "Giant; \"Big\" Box" <sysservices@example.net>
	Date: Tue, 1 Jul 2003 10:52:37 +0200
	Message-ID: <5678.21-Nov-1997@example.com>

	Hi everyone.
	`

	//todo: not yet implemented in net/mail
	//once there is support for this, add it
	var rfc5322exampleA13 = `From: Pete <pete@silly.example>
	To: A Group:Ed Jones <c@a.test>,joe@where.test,John <jdoe@one.test>;
	Cc: Undisclosed recipients:;
	Date: Thu, 13 Feb 1969 23:32:54 -0330
	Message-ID: <testabcd.1234@silly.example>

	Testing.
	`

	//we skipped the first message bcause it's the same as A 1.1
	var rfc5322exampleA2a = `From: Mary Smith <mary@example.net>
	To: John Doe <jdoe@machine.example>
	Reply-To: "Mary Smith: Personal Account" <smith@home.example>
	Subject: Re: Saying Hello
	Date: Fri, 21 Nov 1997 10:01:10 -0600
	Message-ID: <3456@example.net>
	In-Reply-To: <1234@local.machine.example>
	References: <1234@local.machine.example>

	This is a reply to your hello.
	`

	var rfc5322exampleA2b = `To: "Mary Smith: Personal Account" <smith@home.example>
	From: John Doe <jdoe@machine.example>
	Subject: Re: Saying Hello
	Date: Fri, 21 Nov 1997 11:00:00 -0600
	Message-ID: <abcd.1234@local.machine.test>
	In-Reply-To: <3456@example.net>
	References: <1234@local.machine.example> <3456@example.net>

	This is a reply to your reply.
	`

	var rfc5322exampleA3 = `Resent-From: Mary Smith <mary@example.net>
	Resent-To: Jane Brown <j-brown@other.example>
	Resent-Date: Mon, 24 Nov 1997 14:22:01 -0800
	Resent-Message-ID: <78910@example.net>
	From: John Doe <jdoe@machine.example>
	To: Mary Smith <mary@example.net>
	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".`

	var rfc5322exampleA4 = `Received: from x.y.test
	by example.net
	via TCP
	with ESMTP
	id ABC12345
	for <mary@example.net>; 21 Nov 1997 10:05:43 -0600
	Received: from node.example by x.y.test; 21 Nov 1997 10:01:22 -0600
	From: John Doe <jdoe@node.example>
	To: Mary Smith <mary@example.net>
	Subject: Saying Hello
	Date: Fri, 21 Nov 1997 09:55:06 -0600
	Message-ID: <1234@local.node.example>

	This is a message just to say hello.
	So, "Hello".`

	var imageContentExample = `From: John Doe <jdoe@machine.example>
	Sender: Michael Jones <mjones@machine.example>
	To: Mary Smith <mary@example.net>
	Subject: Saying Hello
	Date: Fri, 21 Nov 1997 09:55:06 -0600
	Message-ID: <1234@local.machine.example>
	Content-Type: image/jpeg;
	x-unix-mode=0644;
	name="image.gif"
	Content-Transfer-Encoding: base64

	R0lGODlhAQE7`