Source file src/net/mail/message_test.go

Documentation: net/mail

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package mail
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"io"
    11  	"mime"
    12  	"reflect"
    13  	"slices"
    14  	"strings"
    15  	"testing"
    16  	"time"
    17  )
    18  
    19  var parseTests = []struct {
    20  	in     string
    21  	header Header
    22  	body   string
    23  }{
    24  	{
    25  		// RFC 5322, Appendix A.1.1
    26  		in: `From: John Doe <jdoe@machine.example>
    27  To: Mary Smith <mary@example.net>
    28  Subject: Saying Hello
    29  Date: Fri, 21 Nov 1997 09:55:06 -0600
    30  Message-ID: <1234@local.machine.example>
    31  
    32  This is a message just to say hello.
    33  So, "Hello".
    34  `,
    35  		header: Header{
    36  			"From":       []string{"John Doe <jdoe@machine.example>"},
    37  			"To":         []string{"Mary Smith <mary@example.net>"},
    38  			"Subject":    []string{"Saying Hello"},
    39  			"Date":       []string{"Fri, 21 Nov 1997 09:55:06 -0600"},
    40  			"Message-Id": []string{"<1234@local.machine.example>"},
    41  		},
    42  		body: "This is a message just to say hello.\nSo, \"Hello\".\n",
    43  	},
    44  	{
    45  		// RFC 5965, Appendix B.1, a part of the multipart message (a header-only sub message)
    46  		in: `Feedback-Type: abuse
    47  User-Agent: SomeGenerator/1.0
    48  Version: 1
    49  `,
    50  		header: Header{
    51  			"Feedback-Type": []string{"abuse"},
    52  			"User-Agent":    []string{"SomeGenerator/1.0"},
    53  			"Version":       []string{"1"},
    54  		},
    55  		body: "",
    56  	},
    57  	{
    58  		// RFC 5322 permits any printable ASCII character,
    59  		// except colon, in a header key. Issue #58862.
    60  		in: `From: iant@golang.org
    61  Custom/Header: v
    62  
    63  Body
    64  `,
    65  		header: Header{
    66  			"From":          []string{"iant@golang.org"},
    67  			"Custom/Header": []string{"v"},
    68  		},
    69  		body: "Body\n",
    70  	},
    71  	{
    72  		// RFC 4155 mbox format. We've historically permitted this,
    73  		// so we continue to permit it. Issue #60332.
    74  		in: `From iant@golang.org Mon Jun 19 00:00:00 2023
    75  From: iant@golang.org
    76  
    77  Hello, gophers!
    78  `,
    79  		header: Header{
    80  			"From":                               []string{"iant@golang.org"},
    81  			"From iant@golang.org Mon Jun 19 00": []string{"00:00 2023"},
    82  		},
    83  		body: "Hello, gophers!\n",
    84  	},
    85  }
    86  
    87  func TestParsing(t *testing.T) {
    88  	for i, test := range parseTests {
    89  		msg, err := ReadMessage(bytes.NewBuffer([]byte(test.in)))
    90  		if err != nil {
    91  			t.Errorf("test #%d: Failed parsing message: %v", i, err)
    92  			continue
    93  		}
    94  		if !headerEq(msg.Header, test.header) {
    95  			t.Errorf("test #%d: Incorrectly parsed message header.\nGot:\n%+v\nWant:\n%+v",
    96  				i, msg.Header, test.header)
    97  		}
    98  		body, err := io.ReadAll(msg.Body)
    99  		if err != nil {
   100  			t.Errorf("test #%d: Failed reading body: %v", i, err)
   101  			continue
   102  		}
   103  		bodyStr := string(body)
   104  		if bodyStr != test.body {
   105  			t.Errorf("test #%d: Incorrectly parsed message body.\nGot:\n%+v\nWant:\n%+v",
   106  				i, bodyStr, test.body)
   107  		}
   108  	}
   109  }
   110  
   111  func headerEq(a, b Header) bool {
   112  	if len(a) != len(b) {
   113  		return false
   114  	}
   115  	for k, as := range a {
   116  		bs, ok := b[k]
   117  		if !ok {
   118  			return false
   119  		}
   120  		if !slices.Equal(as, bs) {
   121  			return false
   122  		}
   123  	}
   124  	return true
   125  }
   126  
   127  func TestDateParsing(t *testing.T) {
   128  	tests := []struct {
   129  		dateStr string
   130  		exp     time.Time
   131  	}{
   132  		// RFC 5322, Appendix A.1.1
   133  		{
   134  			"Fri, 21 Nov 1997 09:55:06 -0600",
   135  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   136  		},
   137  		// RFC 5322, Appendix A.6.2
   138  		// Obsolete date.
   139  		{
   140  			"21 Nov 97 09:55:06 GMT",
   141  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("GMT", 0)),
   142  		},
   143  		// Commonly found format not specified by RFC 5322.
   144  		{
   145  			"Fri, 21 Nov 1997 09:55:06 -0600 (MDT)",
   146  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   147  		},
   148  		{
   149  			"Thu, 20 Nov 1997 09:55:06 -0600 (MDT)",
   150  			time.Date(1997, 11, 20, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   151  		},
   152  		{
   153  			"Thu, 20 Nov 1997 09:55:06 GMT (GMT)",
   154  			time.Date(1997, 11, 20, 9, 55, 6, 0, time.UTC),
   155  		},
   156  		{
   157  			"Fri, 21 Nov 1997 09:55:06 +1300 (TOT)",
   158  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", +13*60*60)),
   159  		},
   160  	}
   161  	for _, test := range tests {
   162  		hdr := Header{
   163  			"Date": []string{test.dateStr},
   164  		}
   165  		date, err := hdr.Date()
   166  		if err != nil {
   167  			t.Errorf("Header(Date: %s).Date(): %v", test.dateStr, err)
   168  		} else if !date.Equal(test.exp) {
   169  			t.Errorf("Header(Date: %s).Date() = %+v, want %+v", test.dateStr, date, test.exp)
   170  		}
   171  
   172  		date, err = ParseDate(test.dateStr)
   173  		if err != nil {
   174  			t.Errorf("ParseDate(%s): %v", test.dateStr, err)
   175  		} else if !date.Equal(test.exp) {
   176  			t.Errorf("ParseDate(%s) = %+v, want %+v", test.dateStr, date, test.exp)
   177  		}
   178  	}
   179  }
   180  
   181  func TestDateParsingCFWS(t *testing.T) {
   182  	tests := []struct {
   183  		dateStr string
   184  		exp     time.Time
   185  		valid   bool
   186  	}{
   187  		// FWS-only. No date.
   188  		{
   189  			"   ",
   190  			// nil is not allowed
   191  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   192  			false,
   193  		},
   194  		// FWS is allowed before optional day of week.
   195  		{
   196  			"   Fri, 21 Nov 1997 09:55:06 -0600",
   197  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   198  			true,
   199  		},
   200  		{
   201  			"21 Nov 1997 09:55:06 -0600",
   202  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   203  			true,
   204  		},
   205  		{
   206  			"Fri 21 Nov 1997 09:55:06 -0600",
   207  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   208  			false, // missing ,
   209  		},
   210  		// FWS is allowed before day of month but HTAB fails.
   211  		{
   212  			"Fri,        21 Nov 1997 09:55:06 -0600",
   213  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   214  			true,
   215  		},
   216  		// FWS is allowed before and after year but HTAB fails.
   217  		{
   218  			"Fri, 21 Nov       1997     09:55:06 -0600",
   219  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   220  			true,
   221  		},
   222  		// FWS is allowed before zone but HTAB is not handled. Obsolete timezone is handled.
   223  		{
   224  			"Fri, 21 Nov 1997 09:55:06           CST",
   225  			time.Time{},
   226  			true,
   227  		},
   228  		// FWS is allowed after date and a CRLF is already replaced.
   229  		{
   230  			"Fri, 21 Nov 1997 09:55:06           CST (no leading FWS and a trailing CRLF) \r\n",
   231  			time.Time{},
   232  			true,
   233  		},
   234  		// CFWS is a reduced set of US-ASCII where space and accentuated are obsolete. No error.
   235  		{
   236  			"Fri, 21    Nov 1997    09:55:06 -0600 (MDT and non-US-ASCII signs éèç )",
   237  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   238  			true,
   239  		},
   240  		// CFWS is allowed after zone including a nested comment.
   241  		// Trailing FWS is allowed.
   242  		{
   243  			"Fri, 21 Nov 1997 09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
   244  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   245  			true,
   246  		},
   247  		// CRLF is incomplete and misplaced.
   248  		{
   249  			"Fri, 21 Nov 1997 \r 09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
   250  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   251  			false,
   252  		},
   253  		// CRLF is complete but misplaced. No error is returned.
   254  		{
   255  			"Fri, 21 Nov 199\r\n7  09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
   256  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   257  			true, // should be false in the strict interpretation of RFC 5322.
   258  		},
   259  		// Invalid ASCII in date.
   260  		{
   261  			"Fri, 21 Nov 1997 ù 09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
   262  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   263  			false,
   264  		},
   265  		// CFWS chars () in date.
   266  		{
   267  			"Fri, 21 Nov () 1997 09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
   268  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   269  			false,
   270  		},
   271  		// Timezone is invalid but T is found in comment.
   272  		{
   273  			"Fri, 21 Nov 1997 09:55:06 -060    \r\n (Thisisa(valid)cfws)   \t ",
   274  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   275  			false,
   276  		},
   277  		// Date has no month.
   278  		{
   279  			"Fri, 21  1997 09:55:06 -0600",
   280  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   281  			false,
   282  		},
   283  		// Invalid month : OCT iso Oct
   284  		{
   285  			"Fri, 21 OCT 1997 09:55:06 CST",
   286  			time.Time{},
   287  			false,
   288  		},
   289  		// A too short time zone.
   290  		{
   291  			"Fri, 21 Nov 1997 09:55:06 -060",
   292  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   293  			false,
   294  		},
   295  		// A too short obsolete time zone.
   296  		{
   297  			"Fri, 21  1997 09:55:06 GT",
   298  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
   299  			false,
   300  		},
   301  		// Ensure that the presence of "T" in the date
   302  		// doesn't trip out ParseDate, as per issue 39260.
   303  		{
   304  			"Tue, 26 May 2020 14:04:40 GMT",
   305  			time.Date(2020, 05, 26, 14, 04, 40, 0, time.UTC),
   306  			true,
   307  		},
   308  		{
   309  			"Tue, 26 May 2020 14:04:40 UT",
   310  			time.Date(2020, 05, 26, 14, 04, 40, 0, time.UTC),
   311  			true,
   312  		},
   313  		{
   314  			"Thu, 21 May 2020 14:04:40 UT",
   315  			time.Date(2020, 05, 21, 14, 04, 40, 0, time.UTC),
   316  			true,
   317  		},
   318  		{
   319  			"Tue, 26 May 2020 14:04:40 XT",
   320  			time.Date(2020, 05, 26, 14, 04, 40, 0, time.UTC),
   321  			false,
   322  		},
   323  		{
   324  			"Thu, 21 May 2020 14:04:40 XT",
   325  			time.Date(2020, 05, 21, 14, 04, 40, 0, time.UTC),
   326  			false,
   327  		},
   328  		{
   329  			"Thu, 21 May 2020 14:04:40 UTC",
   330  			time.Date(2020, 05, 21, 14, 04, 40, 0, time.UTC),
   331  			true,
   332  		},
   333  		{
   334  			"Fri, 21 Nov 1997 09:55:06 GMT (GMT)",
   335  			time.Date(1997, 11, 21, 9, 55, 6, 0, time.UTC),
   336  			true,
   337  		},
   338  	}
   339  	for _, test := range tests {
   340  		hdr := Header{
   341  			"Date": []string{test.dateStr},
   342  		}
   343  		date, err := hdr.Date()
   344  		if err != nil && test.valid {
   345  			t.Errorf("Header(Date: %s).Date(): %v", test.dateStr, err)
   346  		} else if err == nil && test.exp.IsZero() {
   347  			// OK.  Used when exact result depends on the
   348  			// system's local zoneinfo.
   349  		} else if err == nil && !date.Equal(test.exp) && test.valid {
   350  			t.Errorf("Header(Date: %s).Date() = %+v, want %+v", test.dateStr, date, test.exp)
   351  		} else if err == nil && !test.valid { // an invalid expression was tested
   352  			t.Errorf("Header(Date: %s).Date() did not return an error but %v", test.dateStr, date)
   353  		}
   354  
   355  		date, err = ParseDate(test.dateStr)
   356  		if err != nil && test.valid {
   357  			t.Errorf("ParseDate(%s): %v", test.dateStr, err)
   358  		} else if err == nil && test.exp.IsZero() {
   359  			// OK.  Used when exact result depends on the
   360  			// system's local zoneinfo.
   361  		} else if err == nil && !test.valid { // an invalid expression was tested
   362  			t.Errorf("ParseDate(%s) did not return an error but %v", test.dateStr, date)
   363  		} else if err == nil && test.valid && !date.Equal(test.exp) {
   364  			t.Errorf("ParseDate(%s) = %+v, want %+v", test.dateStr, date, test.exp)
   365  		}
   366  	}
   367  }
   368  
   369  func TestAddressParsingError(t *testing.T) {
   370  	mustErrTestCases := [...]struct {
   371  		text        string
   372  		wantErrText string
   373  	}{
   374  		0:  {"=?iso-8859-2?Q?Bogl=E1rka_Tak=E1cs?= <unknown@gmail.com>", "charset not supported"},
   375  		1:  {"a@gmail.com b@gmail.com", "expected single address"},
   376  		2:  {string([]byte{0xed, 0xa0, 0x80}) + " <micro@example.net>", "invalid utf-8 in address"},
   377  		3:  {"\"" + string([]byte{0xed, 0xa0, 0x80}) + "\" <half-surrogate@example.com>", "invalid utf-8 in quoted-string"},
   378  		4:  {"\"\\" + string([]byte{0x80}) + "\" <escaped-invalid-unicode@example.net>", "invalid utf-8 in quoted-string"},
   379  		5:  {"\"\x00\" <null@example.net>", "bad character in quoted-string"},
   380  		6:  {"\"\\\x00\" <escaped-null@example.net>", "bad character in quoted-string"},
   381  		7:  {"John Doe", "no angle-addr"},
   382  		8:  {`<jdoe#machine.example>`, "missing @ in addr-spec"},
   383  		9:  {`John <middle> Doe <jdoe@machine.example>`, "missing @ in addr-spec"},
   384  		10: {"cfws@example.com (", "misformatted parenthetical comment"},
   385  		11: {"empty group: ;", "empty group"},
   386  		12: {"root group: embed group: null@example.com;", "no angle-addr"},
   387  		13: {"group not closed: null@example.com", "expected comma"},
   388  		14: {"group: first@example.com, second@example.com;", "group with multiple addresses"},
   389  		15: {"john.doe", "missing '@' or angle-addr"},
   390  		16: {"john.doe@", "missing '@' or angle-addr"},
   391  		17: {"John Doe@foo.bar", "no angle-addr"},
   392  		18: {" group: null@example.com; (asd", "misformatted parenthetical comment"},
   393  		19: {" group: ; (asd", "misformatted parenthetical comment"},
   394  		20: {`(John) Doe <jdoe@machine.example>`, "missing word in phrase:"},
   395  		21: {"<jdoe@[" + string([]byte{0xed, 0xa0, 0x80}) + "192.168.0.1]>", "invalid utf-8 in domain-literal"},
   396  		22: {"<jdoe@[[192.168.0.1]>", "bad character in domain-literal"},
   397  		23: {"<jdoe@[192.168.0.1>", "unclosed domain-literal"},
   398  		24: {"<jdoe@[256.0.0.1]>", "invalid IP address in domain-literal"},
   399  	}
   400  
   401  	for i, tc := range mustErrTestCases {
   402  		_, err := ParseAddress(tc.text)
   403  		if err == nil || !strings.Contains(err.Error(), tc.wantErrText) {
   404  			t.Errorf(`mail.ParseAddress(%q) #%d want %q, got %v`, tc.text, i, tc.wantErrText, err)
   405  		}
   406  	}
   407  
   408  	t.Run("CustomWordDecoder", func(t *testing.T) {
   409  		p := &AddressParser{WordDecoder: &mime.WordDecoder{}}
   410  		for i, tc := range mustErrTestCases {
   411  			_, err := p.Parse(tc.text)
   412  			if err == nil || !strings.Contains(err.Error(), tc.wantErrText) {
   413  				t.Errorf(`p.Parse(%q) #%d want %q, got %v`, tc.text, i, tc.wantErrText, err)
   414  			}
   415  		}
   416  	})
   417  
   418  }
   419  
   420  func TestAddressParsing(t *testing.T) {
   421  	tests := []struct {
   422  		addrsStr string
   423  		exp      []*Address
   424  	}{
   425  		// Bare address
   426  		{
   427  			`jdoe@machine.example`,
   428  			[]*Address{{
   429  				Address: "jdoe@machine.example",
   430  			}},
   431  		},
   432  		// RFC 5322, Appendix A.1.1
   433  		{
   434  			`John Doe <jdoe@machine.example>`,
   435  			[]*Address{{
   436  				Name:    "John Doe",
   437  				Address: "jdoe@machine.example",
   438  			}},
   439  		},
   440  		// RFC 5322, Appendix A.1.2
   441  		{
   442  			`"Joe Q. Public" <john.q.public@example.com>`,
   443  			[]*Address{{
   444  				Name:    "Joe Q. Public",
   445  				Address: "john.q.public@example.com",
   446  			}},
   447  		},
   448  		// Comment in display name
   449  		{
   450  			`John (middle) Doe <jdoe@machine.example>`,
   451  			[]*Address{{
   452  				Name:    "John Doe",
   453  				Address: "jdoe@machine.example",
   454  			}},
   455  		},
   456  		// Display name is quoted string, so comment is not a comment
   457  		{
   458  			`"John (middle) Doe" <jdoe@machine.example>`,
   459  			[]*Address{{
   460  				Name:    "John (middle) Doe",
   461  				Address: "jdoe@machine.example",
   462  			}},
   463  		},
   464  		{
   465  			`"John <middle> Doe" <jdoe@machine.example>`,
   466  			[]*Address{{
   467  				Name:    "John <middle> Doe",
   468  				Address: "jdoe@machine.example",
   469  			}},
   470  		},
   471  		{
   472  			`Mary Smith <mary@x.test>, jdoe@example.org, Who? <one@y.test>`,
   473  			[]*Address{
   474  				{
   475  					Name:    "Mary Smith",
   476  					Address: "mary@x.test",
   477  				},
   478  				{
   479  					Address: "jdoe@example.org",
   480  				},
   481  				{
   482  					Name:    "Who?",
   483  					Address: "one@y.test",
   484  				},
   485  			},
   486  		},
   487  		{
   488  			`<boss@nil.test>, "Giant; \"Big\" Box" <sysservices@example.net>`,
   489  			[]*Address{
   490  				{
   491  					Address: "boss@nil.test",
   492  				},
   493  				{
   494  					Name:    `Giant; "Big" Box`,
   495  					Address: "sysservices@example.net",
   496  				},
   497  			},
   498  		},
   499  		// RFC 5322, Appendix A.6.1
   500  		{
   501  			`Joe Q. Public <john.q.public@example.com>`,
   502  			[]*Address{{
   503  				Name:    "Joe Q. Public",
   504  				Address: "john.q.public@example.com",
   505  			}},
   506  		},
   507  		// RFC 5322, Appendix A.1.3
   508  		{
   509  			`group1: groupaddr1@example.com;`,
   510  			[]*Address{
   511  				{
   512  					Name:    "",
   513  					Address: "groupaddr1@example.com",
   514  				},
   515  			},
   516  		},
   517  		{
   518  			`empty group: ;`,
   519  			[]*Address(nil),
   520  		},
   521  		{
   522  			`A Group:Ed Jones <c@a.test>,joe@where.test,John <jdoe@one.test>;`,
   523  			[]*Address{
   524  				{
   525  					Name:    "Ed Jones",
   526  					Address: "c@a.test",
   527  				},
   528  				{
   529  					Name:    "",
   530  					Address: "joe@where.test",
   531  				},
   532  				{
   533  					Name:    "John",
   534  					Address: "jdoe@one.test",
   535  				},
   536  			},
   537  		},
   538  		// RFC5322 4.4 obs-addr-list
   539  		{
   540  			` , joe@where.test,,John <jdoe@one.test>,`,
   541  			[]*Address{
   542  				{
   543  					Name:    "",
   544  					Address: "joe@where.test",
   545  				},
   546  				{
   547  					Name:    "John",
   548  					Address: "jdoe@one.test",
   549  				},
   550  			},
   551  		},
   552  		{
   553  			` , joe@where.test,,John <jdoe@one.test>,,`,
   554  			[]*Address{
   555  				{
   556  					Name:    "",
   557  					Address: "joe@where.test",
   558  				},
   559  				{
   560  					Name:    "John",
   561  					Address: "jdoe@one.test",
   562  				},
   563  			},
   564  		},
   565  		{
   566  			`Group1: <addr1@example.com>;, Group 2: addr2@example.com;, John <addr3@example.com>`,
   567  			[]*Address{
   568  				{
   569  					Name:    "",
   570  					Address: "addr1@example.com",
   571  				},
   572  				{
   573  					Name:    "",
   574  					Address: "addr2@example.com",
   575  				},
   576  				{
   577  					Name:    "John",
   578  					Address: "addr3@example.com",
   579  				},
   580  			},
   581  		},
   582  		// RFC 2047 "Q"-encoded ISO-8859-1 address.
   583  		{
   584  			`=?iso-8859-1?q?J=F6rg_Doe?= <joerg@example.com>`,
   585  			[]*Address{
   586  				{
   587  					Name:    `Jörg Doe`,
   588  					Address: "joerg@example.com",
   589  				},
   590  			},
   591  		},
   592  		// RFC 2047 "Q"-encoded US-ASCII address. Dumb but legal.
   593  		{
   594  			`=?us-ascii?q?J=6Frg_Doe?= <joerg@example.com>`,
   595  			[]*Address{
   596  				{
   597  					Name:    `Jorg Doe`,
   598  					Address: "joerg@example.com",
   599  				},
   600  			},
   601  		},
   602  		// RFC 2047 "Q"-encoded UTF-8 address.
   603  		{
   604  			`=?utf-8?q?J=C3=B6rg_Doe?= <joerg@example.com>`,
   605  			[]*Address{
   606  				{
   607  					Name:    `Jörg Doe`,
   608  					Address: "joerg@example.com",
   609  				},
   610  			},
   611  		},
   612  		// RFC 2047 "Q"-encoded UTF-8 address with multiple encoded-words.
   613  		{
   614  			`=?utf-8?q?J=C3=B6rg?=  =?utf-8?q?Doe?= <joerg@example.com>`,
   615  			[]*Address{
   616  				{
   617  					Name:    `JörgDoe`,
   618  					Address: "joerg@example.com",
   619  				},
   620  			},
   621  		},
   622  		// RFC 2047, Section 8.
   623  		{
   624  			`=?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>`,
   625  			[]*Address{
   626  				{
   627  					Name:    `André Pirard`,
   628  					Address: "PIRARD@vm1.ulg.ac.be",
   629  				},
   630  			},
   631  		},
   632  		// Custom example of RFC 2047 "B"-encoded ISO-8859-1 address.
   633  		{
   634  			`=?ISO-8859-1?B?SvZyZw==?= <joerg@example.com>`,
   635  			[]*Address{
   636  				{
   637  					Name:    `Jörg`,
   638  					Address: "joerg@example.com",
   639  				},
   640  			},
   641  		},
   642  		// Custom example of RFC 2047 "B"-encoded UTF-8 address.
   643  		{
   644  			`=?UTF-8?B?SsO2cmc=?= <joerg@example.com>`,
   645  			[]*Address{
   646  				{
   647  					Name:    `Jörg`,
   648  					Address: "joerg@example.com",
   649  				},
   650  			},
   651  		},
   652  		// Custom example with "." in name. For issue 4938
   653  		{
   654  			`Asem H. <noreply@example.com>`,
   655  			[]*Address{
   656  				{
   657  					Name:    `Asem H.`,
   658  					Address: "noreply@example.com",
   659  				},
   660  			},
   661  		},
   662  		// RFC 6532 3.2.3, qtext /= UTF8-non-ascii
   663  		{
   664  			`"Gø Pher" <gopher@example.com>`,
   665  			[]*Address{
   666  				{
   667  					Name:    `Gø Pher`,
   668  					Address: "gopher@example.com",
   669  				},
   670  			},
   671  		},
   672  		// RFC 6532 3.2, atext /= UTF8-non-ascii
   673  		{
   674  			`µ <micro@example.com>`,
   675  			[]*Address{
   676  				{
   677  					Name:    `µ`,
   678  					Address: "micro@example.com",
   679  				},
   680  			},
   681  		},
   682  		// RFC 6532 3.2.2, local address parts allow UTF-8
   683  		{
   684  			`Micro <µ@example.com>`,
   685  			[]*Address{
   686  				{
   687  					Name:    `Micro`,
   688  					Address: "µ@example.com",
   689  				},
   690  			},
   691  		},
   692  		// RFC 6532 3.2.4, domains parts allow UTF-8
   693  		{
   694  			`Micro <micro@µ.example.com>`,
   695  			[]*Address{
   696  				{
   697  					Name:    `Micro`,
   698  					Address: "micro@µ.example.com",
   699  				},
   700  			},
   701  		},
   702  		// Issue 14866
   703  		{
   704  			`"" <emptystring@example.com>`,
   705  			[]*Address{
   706  				{
   707  					Name:    "",
   708  					Address: "emptystring@example.com",
   709  				},
   710  			},
   711  		},
   712  		// CFWS
   713  		{
   714  			`<cfws@example.com> (CFWS (cfws))  (another comment)`,
   715  			[]*Address{
   716  				{
   717  					Name:    "",
   718  					Address: "cfws@example.com",
   719  				},
   720  			},
   721  		},
   722  		{
   723  			`<cfws@example.com> ()  (another comment), <cfws2@example.com> (another)`,
   724  			[]*Address{
   725  				{
   726  					Name:    "",
   727  					Address: "cfws@example.com",
   728  				},
   729  				{
   730  					Name:    "",
   731  					Address: "cfws2@example.com",
   732  				},
   733  			},
   734  		},
   735  		// Comment as display name
   736  		{
   737  			`john@example.com (John Doe)`,
   738  			[]*Address{
   739  				{
   740  					Name:    "John Doe",
   741  					Address: "john@example.com",
   742  				},
   743  			},
   744  		},
   745  		// Comment and display name
   746  		{
   747  			`John Doe <john@example.com> (Joey)`,
   748  			[]*Address{
   749  				{
   750  					Name:    "John Doe",
   751  					Address: "john@example.com",
   752  				},
   753  			},
   754  		},
   755  		// Comment as display name, no space
   756  		{
   757  			`john@example.com(John Doe)`,
   758  			[]*Address{
   759  				{
   760  					Name:    "John Doe",
   761  					Address: "john@example.com",
   762  				},
   763  			},
   764  		},
   765  		// Comment as display name, Q-encoded
   766  		{
   767  			`asjo@example.com (Adam =?utf-8?Q?Sj=C3=B8gren?=)`,
   768  			[]*Address{
   769  				{
   770  					Name:    "Adam Sjøgren",
   771  					Address: "asjo@example.com",
   772  				},
   773  			},
   774  		},
   775  		// Comment as display name, Q-encoded and tab-separated
   776  		{
   777  			`asjo@example.com (Adam	=?utf-8?Q?Sj=C3=B8gren?=)`,
   778  			[]*Address{
   779  				{
   780  					Name:    "Adam Sjøgren",
   781  					Address: "asjo@example.com",
   782  				},
   783  			},
   784  		},
   785  		// Nested comment as display name, Q-encoded
   786  		{
   787  			`asjo@example.com (Adam =?utf-8?Q?Sj=C3=B8gren?= (Debian))`,
   788  			[]*Address{
   789  				{
   790  					Name:    "Adam Sjøgren (Debian)",
   791  					Address: "asjo@example.com",
   792  				},
   793  			},
   794  		},
   795  		// Comment in group display name
   796  		{
   797  			`group (comment:): a@example.com, b@example.com;`,
   798  			[]*Address{
   799  				{
   800  					Address: "a@example.com",
   801  				},
   802  				{
   803  					Address: "b@example.com",
   804  				},
   805  			},
   806  		},
   807  		{
   808  			`x(:"):"@a.example;("@b.example;`,
   809  			[]*Address{
   810  				{
   811  					Address: `@a.example;(@b.example`,
   812  				},
   813  			},
   814  		},
   815  		// Domain-literal
   816  		{
   817  			`jdoe@[192.168.0.1]`,
   818  			[]*Address{{
   819  				Address: "jdoe@[192.168.0.1]",
   820  			}},
   821  		},
   822  		{
   823  			`John Doe <jdoe@[192.168.0.1]>`,
   824  			[]*Address{{
   825  				Name:    "John Doe",
   826  				Address: "jdoe@[192.168.0.1]",
   827  			}},
   828  		},
   829  	}
   830  	for _, test := range tests {
   831  		if len(test.exp) == 1 {
   832  			addr, err := ParseAddress(test.addrsStr)
   833  			if err != nil {
   834  				t.Errorf("Failed parsing (single) %q: %v", test.addrsStr, err)
   835  				continue
   836  			}
   837  			if !reflect.DeepEqual([]*Address{addr}, test.exp) {
   838  				t.Errorf("Parse (single) of %q: got %+v, want %+v", test.addrsStr, addr, test.exp)
   839  			}
   840  		}
   841  
   842  		addrs, err := ParseAddressList(test.addrsStr)
   843  		if err != nil {
   844  			t.Errorf("Failed parsing (list) %q: %v", test.addrsStr, err)
   845  			continue
   846  		}
   847  		if !reflect.DeepEqual(addrs, test.exp) {
   848  			t.Errorf("Parse (list) of %q: got %+v, want %+v", test.addrsStr, addrs, test.exp)
   849  		}
   850  	}
   851  }
   852  
   853  func TestAddressParser(t *testing.T) {
   854  	tests := []struct {
   855  		addrsStr string
   856  		exp      []*Address
   857  	}{
   858  		// Bare address
   859  		{
   860  			`jdoe@machine.example`,
   861  			[]*Address{{
   862  				Address: "jdoe@machine.example",
   863  			}},
   864  		},
   865  		// RFC 5322, Appendix A.1.1
   866  		{
   867  			`John Doe <jdoe@machine.example>`,
   868  			[]*Address{{
   869  				Name:    "John Doe",
   870  				Address: "jdoe@machine.example",
   871  			}},
   872  		},
   873  		// RFC 5322, Appendix A.1.2
   874  		{
   875  			`"Joe Q. Public" <john.q.public@example.com>`,
   876  			[]*Address{{
   877  				Name:    "Joe Q. Public",
   878  				Address: "john.q.public@example.com",
   879  			}},
   880  		},
   881  		{
   882  			`Mary Smith <mary@x.test>, jdoe@example.org, Who? <one@y.test>`,
   883  			[]*Address{
   884  				{
   885  					Name:    "Mary Smith",
   886  					Address: "mary@x.test",
   887  				},
   888  				{
   889  					Address: "jdoe@example.org",
   890  				},
   891  				{
   892  					Name:    "Who?",
   893  					Address: "one@y.test",
   894  				},
   895  			},
   896  		},
   897  		{
   898  			`<boss@nil.test>, "Giant; \"Big\" Box" <sysservices@example.net>`,
   899  			[]*Address{
   900  				{
   901  					Address: "boss@nil.test",
   902  				},
   903  				{
   904  					Name:    `Giant; "Big" Box`,
   905  					Address: "sysservices@example.net",
   906  				},
   907  			},
   908  		},
   909  		// RFC 2047 "Q"-encoded ISO-8859-1 address.
   910  		{
   911  			`=?iso-8859-1?q?J=F6rg_Doe?= <joerg@example.com>`,
   912  			[]*Address{
   913  				{
   914  					Name:    `Jörg Doe`,
   915  					Address: "joerg@example.com",
   916  				},
   917  			},
   918  		},
   919  		// RFC 2047 "Q"-encoded US-ASCII address. Dumb but legal.
   920  		{
   921  			`=?us-ascii?q?J=6Frg_Doe?= <joerg@example.com>`,
   922  			[]*Address{
   923  				{
   924  					Name:    `Jorg Doe`,
   925  					Address: "joerg@example.com",
   926  				},
   927  			},
   928  		},
   929  		// RFC 2047 "Q"-encoded ISO-8859-15 address.
   930  		{
   931  			`=?ISO-8859-15?Q?J=F6rg_Doe?= <joerg@example.com>`,
   932  			[]*Address{
   933  				{
   934  					Name:    `Jörg Doe`,
   935  					Address: "joerg@example.com",
   936  				},
   937  			},
   938  		},
   939  		// RFC 2047 "B"-encoded windows-1252 address.
   940  		{
   941  			`=?windows-1252?q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>`,
   942  			[]*Address{
   943  				{
   944  					Name:    `André Pirard`,
   945  					Address: "PIRARD@vm1.ulg.ac.be",
   946  				},
   947  			},
   948  		},
   949  		// Custom example of RFC 2047 "B"-encoded ISO-8859-15 address.
   950  		{
   951  			`=?ISO-8859-15?B?SvZyZw==?= <joerg@example.com>`,
   952  			[]*Address{
   953  				{
   954  					Name:    `Jörg`,
   955  					Address: "joerg@example.com",
   956  				},
   957  			},
   958  		},
   959  		// Custom example of RFC 2047 "B"-encoded UTF-8 address.
   960  		{
   961  			`=?UTF-8?B?SsO2cmc=?= <joerg@example.com>`,
   962  			[]*Address{
   963  				{
   964  					Name:    `Jörg`,
   965  					Address: "joerg@example.com",
   966  				},
   967  			},
   968  		},
   969  		// Custom example with "." in name. For issue 4938
   970  		{
   971  			`Asem H. <noreply@example.com>`,
   972  			[]*Address{
   973  				{
   974  					Name:    `Asem H.`,
   975  					Address: "noreply@example.com",
   976  				},
   977  			},
   978  		},
   979  		// Domain-literal
   980  		{
   981  			`jdoe@[192.168.0.1]`,
   982  			[]*Address{{
   983  				Address: "jdoe@[192.168.0.1]",
   984  			}},
   985  		},
   986  		{
   987  			`John Doe <jdoe@[192.168.0.1]>`,
   988  			[]*Address{{
   989  				Name:    "John Doe",
   990  				Address: "jdoe@[192.168.0.1]",
   991  			}},
   992  		},
   993  	}
   994  
   995  	ap := AddressParser{WordDecoder: &mime.WordDecoder{
   996  		CharsetReader: func(charset string, input io.Reader) (io.Reader, error) {
   997  			in, err := io.ReadAll(input)
   998  			if err != nil {
   999  				return nil, err
  1000  			}
  1001  
  1002  			switch charset {
  1003  			case "iso-8859-15":
  1004  				in = bytes.ReplaceAll(in, []byte("\xf6"), []byte("ö"))
  1005  			case "windows-1252":
  1006  				in = bytes.ReplaceAll(in, []byte("\xe9"), []byte("é"))
  1007  			}
  1008  
  1009  			return bytes.NewReader(in), nil
  1010  		},
  1011  	}}
  1012  
  1013  	for _, test := range tests {
  1014  		if len(test.exp) == 1 {
  1015  			addr, err := ap.Parse(test.addrsStr)
  1016  			if err != nil {
  1017  				t.Errorf("Failed parsing (single) %q: %v", test.addrsStr, err)
  1018  				continue
  1019  			}
  1020  			if !reflect.DeepEqual([]*Address{addr}, test.exp) {
  1021  				t.Errorf("Parse (single) of %q: got %+v, want %+v", test.addrsStr, addr, test.exp)
  1022  			}
  1023  		}
  1024  
  1025  		addrs, err := ap.ParseList(test.addrsStr)
  1026  		if err != nil {
  1027  			t.Errorf("Failed parsing (list) %q: %v", test.addrsStr, err)
  1028  			continue
  1029  		}
  1030  		if !reflect.DeepEqual(addrs, test.exp) {
  1031  			t.Errorf("Parse (list) of %q: got %+v, want %+v", test.addrsStr, addrs, test.exp)
  1032  		}
  1033  	}
  1034  }
  1035  
  1036  func TestAddressString(t *testing.T) {
  1037  	tests := []struct {
  1038  		addr *Address
  1039  		exp  string
  1040  	}{
  1041  		{
  1042  			&Address{Address: "bob@example.com"},
  1043  			"<bob@example.com>",
  1044  		},
  1045  		{ // quoted local parts: RFC 5322, 3.4.1. and 3.2.4.
  1046  			&Address{Address: `my@idiot@address@example.com`},
  1047  			`<"my@idiot@address"@example.com>`,
  1048  		},
  1049  		{ // quoted local parts
  1050  			&Address{Address: ` @example.com`},
  1051  			`<" "@example.com>`,
  1052  		},
  1053  		{
  1054  			&Address{Name: "Bob", Address: "bob@example.com"},
  1055  			`"Bob" <bob@example.com>`,
  1056  		},
  1057  		{
  1058  			// note the ö (o with an umlaut)
  1059  			&Address{Name: "Böb", Address: "bob@example.com"},
  1060  			`=?utf-8?q?B=C3=B6b?= <bob@example.com>`,
  1061  		},
  1062  		{
  1063  			&Address{Name: "Bob Jane", Address: "bob@example.com"},
  1064  			`"Bob Jane" <bob@example.com>`,
  1065  		},
  1066  		{
  1067  			&Address{Name: "Böb Jacöb", Address: "bob@example.com"},
  1068  			`=?utf-8?q?B=C3=B6b_Jac=C3=B6b?= <bob@example.com>`,
  1069  		},
  1070  		{ // https://golang.org/issue/12098
  1071  			&Address{Name: "Rob", Address: ""},
  1072  			`"Rob" <@>`,
  1073  		},
  1074  		{ // https://golang.org/issue/12098
  1075  			&Address{Name: "Rob", Address: "@"},
  1076  			`"Rob" <@>`,
  1077  		},
  1078  		{
  1079  			&Address{Name: "Böb, Jacöb", Address: "bob@example.com"},
  1080  			`=?utf-8?b?QsO2YiwgSmFjw7Zi?= <bob@example.com>`,
  1081  		},
  1082  		{
  1083  			&Address{Name: "=??Q?x?=", Address: "hello@world.com"},
  1084  			`"=??Q?x?=" <hello@world.com>`,
  1085  		},
  1086  		{
  1087  			&Address{Name: "=?hello", Address: "hello@world.com"},
  1088  			`"=?hello" <hello@world.com>`,
  1089  		},
  1090  		{
  1091  			&Address{Name: "world?=", Address: "hello@world.com"},
  1092  			`"world?=" <hello@world.com>`,
  1093  		},
  1094  		{
  1095  			// should q-encode even for invalid utf-8.
  1096  			&Address{Name: string([]byte{0xed, 0xa0, 0x80}), Address: "invalid-utf8@example.net"},
  1097  			"=?utf-8?q?=ED=A0=80?= <invalid-utf8@example.net>",
  1098  		},
  1099  		// Domain-literal
  1100  		{
  1101  			&Address{Address: "bob@[192.168.0.1]"},
  1102  			"<bob@[192.168.0.1]>",
  1103  		},
  1104  		{
  1105  			&Address{Name: "Bob", Address: "bob@[192.168.0.1]"},
  1106  			`"Bob" <bob@[192.168.0.1]>`,
  1107  		},
  1108  	}
  1109  	for _, test := range tests {
  1110  		s := test.addr.String()
  1111  		if s != test.exp {
  1112  			t.Errorf("Address%+v.String() = %v, want %v", *test.addr, s, test.exp)
  1113  			continue
  1114  		}
  1115  
  1116  		// Check round-trip.
  1117  		if test.addr.Address != "" && test.addr.Address != "@" {
  1118  			a, err := ParseAddress(test.exp)
  1119  			if err != nil {
  1120  				t.Errorf("ParseAddress(%#q): %v", test.exp, err)
  1121  				continue
  1122  			}
  1123  			if a.Name != test.addr.Name || a.Address != test.addr.Address {
  1124  				t.Errorf("ParseAddress(%#q) = %#v, want %#v", test.exp, a, test.addr)
  1125  			}
  1126  		}
  1127  	}
  1128  }
  1129  
  1130  // Check if all valid addresses can be parsed, formatted and parsed again
  1131  func TestAddressParsingAndFormatting(t *testing.T) {
  1132  
  1133  	// Should pass
  1134  	tests := []string{
  1135  		`<Bob@example.com>`,
  1136  		`<bob.bob@example.com>`,
  1137  		`<".bob"@example.com>`,
  1138  		`<" "@example.com>`,
  1139  		`<some.mail-with-dash@example.com>`,
  1140  		`<"dot.and space"@example.com>`,
  1141  		`<"very.unusual.@.unusual.com"@example.com>`,
  1142  		`<admin@mailserver1>`,
  1143  		`<postmaster@localhost>`,
  1144  		"<#!$%&'*+-/=?^_`{}|~@example.org>",
  1145  		`<"very.(),:;<>[]\".VERY.\"very@\\ \"very\".unusual"@strange.example.com>`, // escaped quotes
  1146  		`<"()<>[]:,;@\\\"!#$%&'*+-/=?^_{}| ~.a"@example.org>`,                      // escaped backslashes
  1147  		`<"Abc\\@def"@example.com>`,
  1148  		`<"Joe\\Blow"@example.com>`,
  1149  		`<test1/test2=test3@example.com>`,
  1150  		`<def!xyz%abc@example.com>`,
  1151  		`<_somename@example.com>`,
  1152  		`<joe@uk>`,
  1153  		`<~@example.com>`,
  1154  		`<"..."@test.com>`,
  1155  		`<"john..doe"@example.com>`,
  1156  		`<"john.doe."@example.com>`,
  1157  		`<".john.doe"@example.com>`,
  1158  		`<"."@example.com>`,
  1159  		`<".."@example.com>`,
  1160  		`<"0:"@0>`,
  1161  		`<Bob@[192.168.0.1]>`,
  1162  	}
  1163  
  1164  	for _, test := range tests {
  1165  		addr, err := ParseAddress(test)
  1166  		if err != nil {
  1167  			t.Errorf("Couldn't parse address %s: %s", test, err.Error())
  1168  			continue
  1169  		}
  1170  		str := addr.String()
  1171  		addr, err = ParseAddress(str)
  1172  		if err != nil {
  1173  			t.Errorf("ParseAddr(%q) error: %v", test, err)
  1174  			continue
  1175  		}
  1176  
  1177  		if addr.String() != test {
  1178  			t.Errorf("String() round-trip = %q; want %q", addr, test)
  1179  			continue
  1180  		}
  1181  
  1182  	}
  1183  
  1184  	// Should fail
  1185  	badTests := []string{
  1186  		`<Abc.example.com>`,
  1187  		`<A@b@c@example.com>`,
  1188  		`<a"b(c)d,e:f;g<h>i[j\k]l@example.com>`,
  1189  		`<just"not"right@example.com>`,
  1190  		`<this is"not\allowed@example.com>`,
  1191  		`<this\ still\"not\\allowed@example.com>`,
  1192  		`<john..doe@example.com>`,
  1193  		`<john.doe@example..com>`,
  1194  		`<john.doe@example..com>`,
  1195  		`<john.doe.@example.com>`,
  1196  		`<john.doe.@.example.com>`,
  1197  		`<.john.doe@example.com>`,
  1198  		`<@example.com>`,
  1199  		`<.@example.com>`,
  1200  		`<test@.>`,
  1201  		`< @example.com>`,
  1202  		`<""test""blah""@example.com>`,
  1203  		`<""@0>`,
  1204  	}
  1205  
  1206  	for _, test := range badTests {
  1207  		_, err := ParseAddress(test)
  1208  		if err == nil {
  1209  			t.Errorf("Should have failed to parse address: %s", test)
  1210  			continue
  1211  		}
  1212  
  1213  	}
  1214  
  1215  }
  1216  
  1217  func TestAddressFormattingAndParsing(t *testing.T) {
  1218  	tests := []*Address{
  1219  		{Name: "@lïce", Address: "alice@example.com"},
  1220  		{Name: "Böb O'Connor", Address: "bob@example.com"},
  1221  		{Name: "???", Address: "bob@example.com"},
  1222  		{Name: "Böb ???", Address: "bob@example.com"},
  1223  		{Name: "Böb (Jacöb)", Address: "bob@example.com"},
  1224  		{Name: "à#$%&'(),.:;<>@[]^`{|}~'", Address: "bob@example.com"},
  1225  		// https://golang.org/issue/11292
  1226  		{Name: "\"\\\x1f,\"", Address: "0@0"},
  1227  		// https://golang.org/issue/12782
  1228  		{Name: "naé, mée", Address: "test.mail@gmail.com"},
  1229  	}
  1230  
  1231  	for i, test := range tests {
  1232  		parsed, err := ParseAddress(test.String())
  1233  		if err != nil {
  1234  			t.Errorf("test #%d: ParseAddr(%q) error: %v", i, test.String(), err)
  1235  			continue
  1236  		}
  1237  		if parsed.Name != test.Name {
  1238  			t.Errorf("test #%d: Parsed name = %q; want %q", i, parsed.Name, test.Name)
  1239  		}
  1240  		if parsed.Address != test.Address {
  1241  			t.Errorf("test #%d: Parsed address = %q; want %q", i, parsed.Address, test.Address)
  1242  		}
  1243  	}
  1244  }
  1245  
  1246  func TestEmptyAddress(t *testing.T) {
  1247  	parsed, err := ParseAddress("")
  1248  	if parsed != nil || err == nil {
  1249  		t.Errorf(`ParseAddress("") = %v, %v, want nil, error`, parsed, err)
  1250  	}
  1251  	list, err := ParseAddressList("")
  1252  	if len(list) > 0 || err == nil {
  1253  		t.Errorf(`ParseAddressList("") = %v, %v, want nil, error`, list, err)
  1254  	}
  1255  	list, err = ParseAddressList(",")
  1256  	if len(list) > 0 || err == nil {
  1257  		t.Errorf(`ParseAddressList("") = %v, %v, want nil, error`, list, err)
  1258  	}
  1259  	list, err = ParseAddressList("a@b c@d")
  1260  	if len(list) > 0 || err == nil {
  1261  		t.Errorf(`ParseAddressList("") = %v, %v, want nil, error`, list, err)
  1262  	}
  1263  }
  1264  
  1265  func BenchmarkConsumePhrase(b *testing.B) {
  1266  	for _, n := range []int{10, 100, 1000, 10000} {
  1267  		b.Run(fmt.Sprintf("words-%d", n), func(b *testing.B) {
  1268  			input := strings.Repeat("=?utf-8?q?hello?= ", n) + "<user@example.com>"
  1269  			for b.Loop() {
  1270  				(&addrParser{s: input}).consumePhrase()
  1271  			}
  1272  		})
  1273  	}
  1274  }
  1275  
  1276  func BenchmarkConsumeComment(b *testing.B) {
  1277  	for _, n := range []int{10, 100, 1000, 10000} {
  1278  		b.Run(fmt.Sprintf("depth-%d", n), func(b *testing.B) {
  1279  			// Build a deeply nested comment: (((...a...)))
  1280  			open := strings.Repeat("(", n)
  1281  			close := strings.Repeat(")", n)
  1282  			// consumeComment expects the leading '(' already consumed,
  1283  			// so we start with one fewer opening paren and the parser
  1284  			// will handle nesting from there.
  1285  			input := open[:n-1] + "a" + close
  1286  			for b.Loop() {
  1287  				p := addrParser{s: input}
  1288  				p.consumeComment()
  1289  			}
  1290  		})
  1291  	}
  1292  }
  1293  

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