-
Notifications
You must be signed in to change notification settings - Fork 44
/
is_email.php
executable file
·1179 lines (1084 loc) · 51.3 KB
/
is_email.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?php
/**
* To validate an email address according to RFCs 5321, 5322 and others
*
* Copyright © 2008-2016, Dominic Sayers <br>
* Test schema documentation Copyright © 2011, Daniel Marschall <br>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Dominic Sayers nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @package is_email
* @author Dominic Sayers <dominic@sayers.cc>
* @copyright 2008-2016 Dominic Sayers
* @license https://www.opensource.org/licenses/bsd-license.php BSD License
* @link https://www.dominicsayers.com/isemail
* @version 3.0.7 - Changed my link to https://isemail.info throughout
*/
// The quality of this code has been improved greatly by using PHPLint
// Copyright (c) 2010 Umberto Salsi
// This is free software; see the license for copying conditions.
// More info: https://www.icosaedro.it/phplint/
/*.
require_module 'standard';
require_module 'pcre';
.*/
if (!defined('ISEMAIL_VALID')) {
/*:diagnostic constants start:*/
// This part of the code is generated using data from test/meta.xml. Beware of making manual alterations
// Categories
define('ISEMAIL_VALID_CATEGORY', 1);
define('ISEMAIL_DNSWARN', 7);
define('ISEMAIL_RFC5321', 15);
define('ISEMAIL_CFWS', 31);
define('ISEMAIL_DEPREC', 63);
define('ISEMAIL_RFC5322', 127);
define('ISEMAIL_ERR', 255);
// Diagnoses
// Address is valid
define('ISEMAIL_VALID', 0);
// Address is valid but a DNS check was not successful
define('ISEMAIL_DNSWARN_NO_MX_RECORD', 5);
define('ISEMAIL_DNSWARN_NO_RECORD', 6);
// Address is valid for SMTP but has unusual elements
define('ISEMAIL_RFC5321_TLD', 9);
define('ISEMAIL_RFC5321_TLDNUMERIC', 10);
define('ISEMAIL_RFC5321_QUOTEDSTRING', 11);
define('ISEMAIL_RFC5321_ADDRESSLITERAL', 12);
define('ISEMAIL_RFC5321_IPV6DEPRECATED', 13);
// Address is valid within the message but cannot be used unmodified for the envelope
define('ISEMAIL_CFWS_COMMENT', 17);
define('ISEMAIL_CFWS_FWS', 18);
// Address contains deprecated elements but may still be valid in restricted contexts
define('ISEMAIL_DEPREC_LOCALPART', 33);
define('ISEMAIL_DEPREC_FWS', 34);
define('ISEMAIL_DEPREC_QTEXT', 35);
define('ISEMAIL_DEPREC_QP', 36);
define('ISEMAIL_DEPREC_COMMENT', 37);
define('ISEMAIL_DEPREC_CTEXT', 38);
define('ISEMAIL_DEPREC_CFWS_NEAR_AT', 49);
// The address is only valid according to the broad definition of RFC 5322. It is otherwise invalid.
define('ISEMAIL_RFC5322_DOMAIN', 65);
define('ISEMAIL_RFC5322_TOOLONG', 66);
define('ISEMAIL_RFC5322_LOCAL_TOOLONG', 67);
define('ISEMAIL_RFC5322_DOMAIN_TOOLONG', 68);
define('ISEMAIL_RFC5322_LABEL_TOOLONG', 69);
define('ISEMAIL_RFC5322_DOMAINLITERAL', 70);
define('ISEMAIL_RFC5322_DOMLIT_OBSDTEXT', 71);
define('ISEMAIL_RFC5322_IPV6_GRPCOUNT', 72);
define('ISEMAIL_RFC5322_IPV6_2X2XCOLON', 73);
define('ISEMAIL_RFC5322_IPV6_BADCHAR', 74);
define('ISEMAIL_RFC5322_IPV6_MAXGRPS', 75);
define('ISEMAIL_RFC5322_IPV6_COLONSTRT', 76);
define('ISEMAIL_RFC5322_IPV6_COLONEND', 77);
// Address is invalid for any purpose
define('ISEMAIL_ERR_EXPECTING_DTEXT', 129);
define('ISEMAIL_ERR_NOLOCALPART', 130);
define('ISEMAIL_ERR_NODOMAIN', 131);
define('ISEMAIL_ERR_CONSECUTIVEDOTS', 132);
define('ISEMAIL_ERR_ATEXT_AFTER_CFWS', 133);
define('ISEMAIL_ERR_ATEXT_AFTER_QS', 134);
define('ISEMAIL_ERR_ATEXT_AFTER_DOMLIT', 135);
define('ISEMAIL_ERR_EXPECTING_QPAIR', 136);
define('ISEMAIL_ERR_EXPECTING_ATEXT', 137);
define('ISEMAIL_ERR_EXPECTING_QTEXT', 138);
define('ISEMAIL_ERR_EXPECTING_CTEXT', 139);
define('ISEMAIL_ERR_BACKSLASHEND', 140);
define('ISEMAIL_ERR_DOT_START', 141);
define('ISEMAIL_ERR_DOT_END', 142);
define('ISEMAIL_ERR_DOMAINHYPHENSTART', 143);
define('ISEMAIL_ERR_DOMAINHYPHENEND', 144);
define('ISEMAIL_ERR_UNCLOSEDQUOTEDSTR', 145);
define('ISEMAIL_ERR_UNCLOSEDCOMMENT', 146);
define('ISEMAIL_ERR_UNCLOSEDDOMLIT', 147);
define('ISEMAIL_ERR_FWS_CRLF_X2', 148);
define('ISEMAIL_ERR_FWS_CRLF_END', 149);
define('ISEMAIL_ERR_CR_NO_LF', 150);
// End of generated code
/*:diagnostic constants end:*/
// function control
define('ISEMAIL_THRESHOLD' , 16);
// Email parts
define('ISEMAIL_COMPONENT_LOCALPART' , 0);
define('ISEMAIL_COMPONENT_DOMAIN' , 1);
define('ISEMAIL_COMPONENT_LITERAL' , 2);
define('ISEMAIL_CONTEXT_COMMENT' , 3);
define('ISEMAIL_CONTEXT_FWS' , 4);
define('ISEMAIL_CONTEXT_QUOTEDSTRING' , 5);
define('ISEMAIL_CONTEXT_QUOTEDPAIR' , 6);
// Miscellaneous string constants
define('ISEMAIL_STRING_AT' , '@');
define('ISEMAIL_STRING_BACKSLASH' , '\\');
define('ISEMAIL_STRING_DOT' , '.');
define('ISEMAIL_STRING_DQUOTE' , '"');
define('ISEMAIL_STRING_OPENPARENTHESIS' , '(');
define('ISEMAIL_STRING_CLOSEPARENTHESIS', ')');
define('ISEMAIL_STRING_OPENSQBRACKET' , '[');
define('ISEMAIL_STRING_CLOSESQBRACKET' , ']');
define('ISEMAIL_STRING_HYPHEN' , '-');
define('ISEMAIL_STRING_COLON' , ':');
define('ISEMAIL_STRING_DOUBLECOLON' , '::');
define('ISEMAIL_STRING_SP' , ' ');
define('ISEMAIL_STRING_HTAB' , "\t");
define('ISEMAIL_STRING_CR' , "\r");
define('ISEMAIL_STRING_LF' , "\n");
define('ISEMAIL_STRING_IPV6TAG' , 'IPv6:');
// US-ASCII visible characters not valid for atext (https://tools.ietf.org/html/rfc5322#section-3.2.3)
define('ISEMAIL_STRING_SPECIALS' , '()<>[]:;@\\,."');
}
/**
* Check that an email address conforms to RFCs 5321, 5322 and others
*
* As of Version 3.0, we are now distinguishing clearly between a Mailbox
* as defined by RFC 5321 and an addr-spec as defined by RFC 5322. Depending
* on the context, either can be regarded as a valid email address. The
* RFC 5321 Mailbox specification is more restrictive (comments, white space
* and obsolete forms are not allowed)
*
* @param string $email The email address to check
* @param boolean $checkDNS If true then a DNS check for MX records will be made
* @param mixed $errorlevel Determines the boundary between valid and invalid addresses.
* Status codes above this number will be returned as-is,
* status codes below will be returned as ISEMAIL_VALID. Thus the
* calling program can simply look for ISEMAIL_VALID if it is
* only interested in whether an address is valid or not. The
* errorlevel will determine how "picky" is_email() is about
* the address.
*
* If omitted or passed as false then is_email() will return
* true or false rather than an integer error or warning.
*
* NB Note the difference between $errorlevel = false and
* $errorlevel = 0
* @param array $parsedata If passed, returns the parsed address components
*/
/*.mixed.*/ function is_email($email, $checkDNS = false, $errorlevel = false, &$parsedata = array()) {
// Check that $email is a valid address. Read the following RFCs to understand the constraints:
// (https://tools.ietf.org/html/rfc5321)
// (https://tools.ietf.org/html/rfc5322)
// (https://tools.ietf.org/html/rfc4291#section-2.2)
// (https://tools.ietf.org/html/rfc1123#section-2.1)
// (https://tools.ietf.org/html/rfc3696) (guidance only)
// version 2.0: Enhance $diagnose parameter to $errorlevel
// version 3.0: Introduced status categories
// revision 3.01: BUG: $parsedata was passed by value instead of by reference
if (is_bool($errorlevel)) {
$threshold = ISEMAIL_VALID;
$diagnose = (bool) $errorlevel;
} else {
$diagnose = true;
switch ((int) $errorlevel) {
case E_WARNING: $threshold = ISEMAIL_THRESHOLD; break; // For backward compatibility
case E_ERROR: $threshold = ISEMAIL_VALID; break; // For backward compatibility
default: $threshold = (int) $errorlevel;
}
}
$return_status = array(ISEMAIL_VALID);
// Parse the address into components, character by character
$raw_length = strlen($email);
$context = ISEMAIL_COMPONENT_LOCALPART; // Where we are
$context_stack = array($context); // Where we have been
$context_prior = ISEMAIL_COMPONENT_LOCALPART; // Where we just came from
$token = ''; // The current character
$token_prior = ''; // The previous character
$parsedata = array(
ISEMAIL_COMPONENT_LOCALPART => '',
ISEMAIL_COMPONENT_DOMAIN => ''
); // For the components of the address
$atomlist = array(
ISEMAIL_COMPONENT_LOCALPART => array(''),
ISEMAIL_COMPONENT_DOMAIN => array('')
); // For the dot-atom elements of the address
$element_count = 0;
$element_len = 0;
$hyphen_flag = false; // Hyphen cannot occur at the end of a subdomain
$end_or_die = false; // CFWS can only appear at the end of the element
//-echo "<table style=\"clear:left;\">"; // debug
for ($i = 0; $i < $raw_length; $i++) {
$token = $email[$i];
//-echo "<tr><td><strong>$context|",(($end_or_die) ? 'true' : 'false'),"|$token|" . max($return_status) . "</strong></td>"; // debug
switch ($context) {
//-------------------------------------------------------------
// local-part
//-------------------------------------------------------------
case ISEMAIL_COMPONENT_LOCALPART:
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// local-part = dot-atom / quoted-string / obs-local-part
//
// dot-atom = [CFWS] dot-atom-text [CFWS]
//
// dot-atom-text = 1*atext *("." 1*atext)
//
// quoted-string = [CFWS]
// DQUOTE *([FWS] qcontent) [FWS] DQUOTE
// [CFWS]
//
// obs-local-part = word *("." word)
//
// word = atom / quoted-string
//
// atom = [CFWS] 1*atext [CFWS]
switch ($token) {
// Comment
case ISEMAIL_STRING_OPENPARENTHESIS:
if ($element_len === 0)
// Comments are OK at the beginning of an element
$return_status[] = ($element_count === 0) ? ISEMAIL_CFWS_COMMENT : ISEMAIL_DEPREC_COMMENT;
else {
$return_status[] = ISEMAIL_CFWS_COMMENT;
$end_or_die = true; // We can't start a comment in the middle of an element, so this better be the end
}
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_COMMENT;
break;
// Next dot-atom element
case ISEMAIL_STRING_DOT:
if ($element_len === 0)
// Another dot, already?
$return_status[] = ($element_count === 0) ? ISEMAIL_ERR_DOT_START : ISEMAIL_ERR_CONSECUTIVEDOTS; // Fatal error
else
// The entire local-part can be a quoted string for RFC 5321
// If it's just one atom that is quoted then it's an RFC 5322 obsolete form
if ($end_or_die) $return_status[] = ISEMAIL_DEPREC_LOCALPART;
$end_or_die = false; // CFWS & quoted strings are OK again now we're at the beginning of an element (although they are obsolete forms)
$element_len = 0;
$element_count++;
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= $token;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] = '';
break;
// Quoted string
case ISEMAIL_STRING_DQUOTE:
if ($element_len === 0) {
// The entire local-part can be a quoted string for RFC 5321
// If it's just one atom that is quoted then it's an RFC 5322 obsolete form
$return_status[] = ($element_count === 0) ? ISEMAIL_RFC5321_QUOTEDSTRING : ISEMAIL_DEPREC_LOCALPART;
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= $token;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] .= $token;
$element_len++;
$end_or_die = true; // Quoted string must be the entire element
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_QUOTEDSTRING;
} else {
$return_status[] = ISEMAIL_ERR_EXPECTING_ATEXT; // Fatal error
}
break;
// Folding White Space
case ISEMAIL_STRING_CR:
case ISEMAIL_STRING_SP:
case ISEMAIL_STRING_HTAB:
if (($token === ISEMAIL_STRING_CR) && ((++$i === $raw_length) || ($email[$i] !== ISEMAIL_STRING_LF))) {$return_status[] = ISEMAIL_ERR_CR_NO_LF; break;} // Fatal error
if ($element_len === 0)
$return_status[] = ($element_count === 0) ? ISEMAIL_CFWS_FWS : ISEMAIL_DEPREC_FWS;
else
$end_or_die = true; // We can't start FWS in the middle of an element, so this better be the end
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_FWS;
$token_prior = $token;
break;
// @
case ISEMAIL_STRING_AT:
// At this point we should have a valid local-part
if (count($context_stack) !== 1) die('Unexpected item on context stack');
if ($parsedata[ISEMAIL_COMPONENT_LOCALPART] === '')
$return_status[] = ISEMAIL_ERR_NOLOCALPART; // Fatal error
elseif ($element_len === 0) $return_status[] = ISEMAIL_ERR_DOT_END; // Fatal error
// https://tools.ietf.org/html/rfc5321#section-4.5.3.1.1
// The maximum total length of a user name or other local-part is 64
// octets.
elseif (strlen($parsedata[ISEMAIL_COMPONENT_LOCALPART]) > 64)
$return_status[] = ISEMAIL_RFC5322_LOCAL_TOOLONG;
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// Comments and folding white space
// SHOULD NOT be used around the "@" in the addr-spec.
//
// https://tools.ietf.org/html/rfc2119
// 4. SHOULD NOT This phrase, or the phrase "NOT RECOMMENDED" mean that
// there may exist valid reasons in particular circumstances when the
// particular behavior is acceptable or even useful, but the full
// implications should be understood and the case carefully weighed
// before implementing any behavior described with this label.
elseif (($context_prior === ISEMAIL_CONTEXT_COMMENT) || ($context_prior === ISEMAIL_CONTEXT_FWS))
$return_status[] = ISEMAIL_DEPREC_CFWS_NEAR_AT;
// Clear everything down for the domain parsing
$context = ISEMAIL_COMPONENT_DOMAIN; // Where we are
$context_stack = array($context); // Where we have been
$element_count = 0;
$element_len = 0;
$end_or_die = false; // CFWS can only appear at the end of the element
break;
// atext
default:
// https://tools.ietf.org/html/rfc5322#section-3.2.3
// atext = ALPHA / DIGIT / ; Printable US-ASCII
// "!" / "#" / ; characters not including
// "$" / "%" / ; specials. Used for atoms.
// "&" / "'" /
// "*" / "+" /
// "-" / "/" /
// "=" / "?" /
// "^" / "_" /
// "`" / "{" /
// "|" / "}" /
// "~"
if ($end_or_die) {
// We have encountered atext where it is no longer valid
switch ($context_prior) {
case ISEMAIL_CONTEXT_COMMENT:
case ISEMAIL_CONTEXT_FWS:
$return_status[] = ISEMAIL_ERR_ATEXT_AFTER_CFWS;
break;
case ISEMAIL_CONTEXT_QUOTEDSTRING:
$return_status[] = ISEMAIL_ERR_ATEXT_AFTER_QS;
break;
default:
die ("More atext found where none is allowed, but unrecognised prior context: $context_prior");
}
} else {
$context_prior = $context;
$ord = ord($token);
if (($ord < 33) || ($ord > 126) || ($ord === 10) || (!is_bool(strpos(ISEMAIL_STRING_SPECIALS, $token))))
$return_status[] = ISEMAIL_ERR_EXPECTING_ATEXT; // Fatal error
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= $token;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] .= $token;
$element_len++;
}
}
break;
//-------------------------------------------------------------
// Domain
//-------------------------------------------------------------
case ISEMAIL_COMPONENT_DOMAIN:
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// domain = dot-atom / domain-literal / obs-domain
//
// dot-atom = [CFWS] dot-atom-text [CFWS]
//
// dot-atom-text = 1*atext *("." 1*atext)
//
// domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
//
// dtext = %d33-90 / ; Printable US-ASCII
// %d94-126 / ; characters not including
// obs-dtext ; "[", "]", or "\"
//
// obs-domain = atom *("." atom)
//
// atom = [CFWS] 1*atext [CFWS]
// https://tools.ietf.org/html/rfc5321#section-4.1.2
// Mailbox = Local-part "@" ( Domain / address-literal )
//
// Domain = sub-domain *("." sub-domain)
//
// address-literal = "[" ( IPv4-address-literal /
// IPv6-address-literal /
// General-address-literal ) "]"
// ; See Section 4.1.3
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// Note: A liberal syntax for the domain portion of addr-spec is
// given here. However, the domain portion contains addressing
// information specified by and used in other protocols (e.g.,
// [RFC1034], [RFC1035], [RFC1123], [RFC5321]). It is therefore
// incumbent upon implementations to conform to the syntax of
// addresses for the context in which they are used.
// is_email() author's note: it's not clear how to interpret this in
// the context of a general email address validator. The conclusion I
// have reached is this: "addressing information" must comply with
// RFC 5321 (and in turn RFC 1035), anything that is "semantically
// invisible" must comply only with RFC 5322.
switch ($token) {
// Comment
case ISEMAIL_STRING_OPENPARENTHESIS:
if ($element_len === 0)
// Comments at the start of the domain are deprecated in the text
// Comments at the start of a subdomain are obs-domain
// (https://tools.ietf.org/html/rfc5322#section-3.4.1)
$return_status[] = ($element_count === 0) ? ISEMAIL_DEPREC_CFWS_NEAR_AT : ISEMAIL_DEPREC_COMMENT;
else {
$return_status[] = ISEMAIL_CFWS_COMMENT;
$end_or_die = true; // We can't start a comment in the middle of an element, so this better be the end
}
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_COMMENT;
break;
// Next dot-atom element
case ISEMAIL_STRING_DOT:
if ($element_len === 0)
// Another dot, already?
$return_status[] = ($element_count === 0) ? ISEMAIL_ERR_DOT_START : ISEMAIL_ERR_CONSECUTIVEDOTS; // Fatal error
elseif ($hyphen_flag)
// Previous subdomain ended in a hyphen
$return_status[] = ISEMAIL_ERR_DOMAINHYPHENEND; // Fatal error
else
// Nowhere in RFC 5321 does it say explicitly that the
// domain part of a Mailbox must be a valid domain according
// to the DNS standards set out in RFC 1035, but this *is*
// implied in several places. For instance, wherever the idea
// of host routing is discussed the RFC says that the domain
// must be looked up in the DNS. This would be nonsense unless
// the domain was designed to be a valid DNS domain. Hence we
// must conclude that the RFC 1035 restriction on label length
// also applies to RFC 5321 domains.
//
// https://tools.ietf.org/html/rfc1035#section-2.3.4
// labels 63 octets or less
if ($element_len > 63) $return_status[] = ISEMAIL_RFC5322_LABEL_TOOLONG;
$end_or_die = false; // CFWS is OK again now we're at the beginning of an element (although it may be obsolete CFWS)
$element_len = 0;
$element_count++;
$atomlist[ISEMAIL_COMPONENT_DOMAIN][$element_count] = '';
$parsedata[ISEMAIL_COMPONENT_DOMAIN] .= $token;
break;
// Domain literal
case ISEMAIL_STRING_OPENSQBRACKET:
if ($parsedata[ISEMAIL_COMPONENT_DOMAIN] === '') {
$end_or_die = true; // Domain literal must be the only component
$element_len++;
$context_stack[] = $context;
$context = ISEMAIL_COMPONENT_LITERAL;
$parsedata[ISEMAIL_COMPONENT_DOMAIN] .= $token;
$atomlist[ISEMAIL_COMPONENT_DOMAIN][$element_count] .= $token;
$parsedata[ISEMAIL_COMPONENT_LITERAL] = '';
} else {
$return_status[] = ISEMAIL_ERR_EXPECTING_ATEXT; // Fatal error
}
break;
// Folding White Space
case ISEMAIL_STRING_CR:
case ISEMAIL_STRING_SP:
case ISEMAIL_STRING_HTAB:
if (($token === ISEMAIL_STRING_CR) && ((++$i === $raw_length) || ($email[$i] !== ISEMAIL_STRING_LF))) {$return_status[] = ISEMAIL_ERR_CR_NO_LF; break;} // Fatal error
if ($element_len === 0)
$return_status[] = ($element_count === 0) ? ISEMAIL_DEPREC_CFWS_NEAR_AT : ISEMAIL_DEPREC_FWS;
else {
$return_status[] = ISEMAIL_CFWS_FWS;
$end_or_die = true; // We can't start FWS in the middle of an element, so this better be the end
}
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_FWS;
$token_prior = $token;
break;
// atext
default:
// RFC 5322 allows any atext...
// https://tools.ietf.org/html/rfc5322#section-3.2.3
// atext = ALPHA / DIGIT / ; Printable US-ASCII
// "!" / "#" / ; characters not including
// "$" / "%" / ; specials. Used for atoms.
// "&" / "'" /
// "*" / "+" /
// "-" / "/" /
// "=" / "?" /
// "^" / "_" /
// "`" / "{" /
// "|" / "}" /
// "~"
// But RFC 5321 only allows letter-digit-hyphen to comply with DNS rules (RFCs 1034 & 1123)
// https://tools.ietf.org/html/rfc5321#section-4.1.2
// sub-domain = Let-dig [Ldh-str]
//
// Let-dig = ALPHA / DIGIT
//
// Ldh-str = *( ALPHA / DIGIT / "-" ) Let-dig
//
if ($end_or_die) {
// We have encountered atext where it is no longer valid
switch ($context_prior) {
case ISEMAIL_CONTEXT_COMMENT:
case ISEMAIL_CONTEXT_FWS:
$return_status[] = ISEMAIL_ERR_ATEXT_AFTER_CFWS;
break;
case ISEMAIL_COMPONENT_LITERAL:
$return_status[] = ISEMAIL_ERR_ATEXT_AFTER_DOMLIT;
break;
default:
die ("More atext found where none is allowed, but unrecognised prior context: $context_prior");
}
}
$ord = ord($token);
$hyphen_flag = false; // Assume this token isn't a hyphen unless we discover it is
if (($ord < 33) || ($ord > 126) || (!is_bool(strpos(ISEMAIL_STRING_SPECIALS, $token)))) {
$return_status[] = ISEMAIL_ERR_EXPECTING_ATEXT; // Fatal error
} elseif ($token === ISEMAIL_STRING_HYPHEN) {
if ($element_len === 0) {
// Hyphens can't be at the beginning of a subdomain
$return_status[] = ISEMAIL_ERR_DOMAINHYPHENSTART; // Fatal error
}
$hyphen_flag = true;
} elseif (!(($ord > 47 && $ord < 58) || ($ord > 64 && $ord < 91) || ($ord > 96 && $ord < 123))) {
// Not an RFC 5321 subdomain, but still OK by RFC 5322
$return_status[] = ISEMAIL_RFC5322_DOMAIN;
}
$parsedata[ISEMAIL_COMPONENT_DOMAIN] .= $token;
$atomlist[ISEMAIL_COMPONENT_DOMAIN][$element_count] .= $token;
$element_len++;
}
break;
//-------------------------------------------------------------
// Domain literal
//-------------------------------------------------------------
case ISEMAIL_COMPONENT_LITERAL:
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
//
// dtext = %d33-90 / ; Printable US-ASCII
// %d94-126 / ; characters not including
// obs-dtext ; "[", "]", or "\"
//
// obs-dtext = obs-NO-WS-CTL / quoted-pair
switch ($token) {
// End of domain literal
case ISEMAIL_STRING_CLOSESQBRACKET:
if ((int) max($return_status) < ISEMAIL_DEPREC) {
// Could be a valid RFC 5321 address literal, so let's check
// https://tools.ietf.org/html/rfc5321#section-4.1.2
// address-literal = "[" ( IPv4-address-literal /
// IPv6-address-literal /
// General-address-literal ) "]"
// ; See Section 4.1.3
//
// https://tools.ietf.org/html/rfc5321#section-4.1.3
// IPv4-address-literal = Snum 3("." Snum)
//
// IPv6-address-literal = "IPv6:" IPv6-addr
//
// General-address-literal = Standardized-tag ":" 1*dcontent
//
// Standardized-tag = Ldh-str
// ; Standardized-tag MUST be specified in a
// ; Standards-Track RFC and registered with IANA
//
// dcontent = %d33-90 / ; Printable US-ASCII
// %d94-126 ; excl. "[", "\", "]"
//
// Snum = 1*3DIGIT
// ; representing a decimal integer
// ; value in the range 0 through 255
//
// IPv6-addr = IPv6-full / IPv6-comp / IPv6v4-full / IPv6v4-comp
//
// IPv6-hex = 1*4HEXDIG
//
// IPv6-full = IPv6-hex 7(":" IPv6-hex)
//
// IPv6-comp = [IPv6-hex *5(":" IPv6-hex)] "::"
// [IPv6-hex *5(":" IPv6-hex)]
// ; The "::" represents at least 2 16-bit groups of
// ; zeros. No more than 6 groups in addition to the
// ; "::" may be present.
//
// IPv6v4-full = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal
//
// IPv6v4-comp = [IPv6-hex *3(":" IPv6-hex)] "::"
// [IPv6-hex *3(":" IPv6-hex) ":"]
// IPv4-address-literal
// ; The "::" represents at least 2 16-bit groups of
// ; zeros. No more than 4 groups in addition to the
// ; "::" and IPv4-address-literal may be present.
//
// is_email() author's note: We can't use ip2long() to validate
// IPv4 addresses because it accepts abbreviated addresses
// (xxx.xxx.xxx), expanding the last group to complete the address.
// filter_var() validates IPv6 address inconsistently (up to PHP 5.3.3
// at least) -- see https://bugs.php.net/bug.php?id=53236 for example
$max_groups = 8;
$matchesIP = array();
/*.mixed.*/ $index = false;
$addressliteral = $parsedata[ISEMAIL_COMPONENT_LITERAL];
// Extract IPv4 part from the end of the address-literal (if there is one)
if (preg_match('/\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/', $addressliteral, $matchesIP) > 0) {
$index = strrpos($addressliteral, $matchesIP[0]);
if ($index !== 0) $addressliteral = substr($addressliteral, 0, $index) . '0:0'; // Convert IPv4 part to IPv6 format for further testing
}
if ($index === 0) {
// Nothing there except a valid IPv4 address, so...
$return_status[] = ISEMAIL_RFC5321_ADDRESSLITERAL;
} elseif (strncasecmp($addressliteral, ISEMAIL_STRING_IPV6TAG, 5) !== 0) {
$return_status[] = ISEMAIL_RFC5322_DOMAINLITERAL;
} else {
$IPv6 = substr($addressliteral, 5);
$matchesIP = explode(ISEMAIL_STRING_COLON, $IPv6); // Revision 2.7: Daniel Marschall's new IPv6 testing strategy
$groupCount = count($matchesIP);
$index = strpos($IPv6,ISEMAIL_STRING_DOUBLECOLON);
if ($index === false) {
// We need exactly the right number of groups
if ($groupCount !== $max_groups)
$return_status[] = ISEMAIL_RFC5322_IPV6_GRPCOUNT;
} else {
if ($index !== strrpos($IPv6,ISEMAIL_STRING_DOUBLECOLON))
$return_status[] = ISEMAIL_RFC5322_IPV6_2X2XCOLON;
else {
if ($index === 0 || $index === (strlen($IPv6) - 2)) $max_groups++; // RFC 4291 allows :: at the start or end of an address with 7 other groups in addition
if ($groupCount > $max_groups)
$return_status[] = ISEMAIL_RFC5322_IPV6_MAXGRPS;
elseif ($groupCount === $max_groups)
$return_status[] = ISEMAIL_RFC5321_IPV6DEPRECATED; // Eliding a single "::"
}
}
// Revision 2.7: Daniel Marschall's new IPv6 testing strategy
if ((substr($IPv6, 0, 1) === ISEMAIL_STRING_COLON) && (substr($IPv6, 1, 1) !== ISEMAIL_STRING_COLON))
$return_status[] = ISEMAIL_RFC5322_IPV6_COLONSTRT; // Address starts with a single colon
elseif ((substr($IPv6, -1) === ISEMAIL_STRING_COLON) && (substr($IPv6, -2, 1) !== ISEMAIL_STRING_COLON))
$return_status[] = ISEMAIL_RFC5322_IPV6_COLONEND; // Address ends with a single colon
elseif (count(preg_grep('/^[0-9A-Fa-f]{0,4}$/', $matchesIP, PREG_GREP_INVERT)) !== 0)
$return_status[] = ISEMAIL_RFC5322_IPV6_BADCHAR; // Check for unmatched characters
else
$return_status[] = ISEMAIL_RFC5321_ADDRESSLITERAL;
}
} else
$return_status[] = ISEMAIL_RFC5322_DOMAINLITERAL;
$parsedata[ISEMAIL_COMPONENT_DOMAIN] .= $token;
$atomlist[ISEMAIL_COMPONENT_DOMAIN][$element_count] .= $token;
$element_len++;
$context_prior = $context;
$context = (int) array_pop($context_stack);
break;
case ISEMAIL_STRING_BACKSLASH:
$return_status[] = ISEMAIL_RFC5322_DOMLIT_OBSDTEXT;
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_QUOTEDPAIR;
break;
// Folding White Space
case ISEMAIL_STRING_CR:
case ISEMAIL_STRING_SP:
case ISEMAIL_STRING_HTAB:
if (($token === ISEMAIL_STRING_CR) && ((++$i === $raw_length) || ($email[$i] !== ISEMAIL_STRING_LF))) {$return_status[] = ISEMAIL_ERR_CR_NO_LF; break;} // Fatal error
$return_status[] = ISEMAIL_CFWS_FWS;
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_FWS;
$token_prior = $token;
break;
// dtext
default:
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// dtext = %d33-90 / ; Printable US-ASCII
// %d94-126 / ; characters not including
// obs-dtext ; "[", "]", or "\"
//
// obs-dtext = obs-NO-WS-CTL / quoted-pair
//
// obs-NO-WS-CTL = %d1-8 / ; US-ASCII control
// %d11 / ; characters that do not
// %d12 / ; include the carriage
// %d14-31 / ; return, line feed, and
// %d127 ; white space characters
$ord = ord($token);
// CR, LF, SP & HTAB have already been parsed above
if (($ord > 127) || ($ord === 0) || ($token === ISEMAIL_STRING_OPENSQBRACKET)) {
$return_status[] = ISEMAIL_ERR_EXPECTING_DTEXT; // Fatal error
break;
} elseif (($ord < 33) || ($ord === 127)) {
$return_status[] = ISEMAIL_RFC5322_DOMLIT_OBSDTEXT;
}
$parsedata[ISEMAIL_COMPONENT_LITERAL] .= $token;
$parsedata[ISEMAIL_COMPONENT_DOMAIN] .= $token;
$atomlist[ISEMAIL_COMPONENT_DOMAIN][$element_count] .= $token;
$element_len++;
}
break;
//-------------------------------------------------------------
// Quoted string
//-------------------------------------------------------------
case ISEMAIL_CONTEXT_QUOTEDSTRING:
// https://tools.ietf.org/html/rfc5322#section-3.2.4
// quoted-string = [CFWS]
// DQUOTE *([FWS] qcontent) [FWS] DQUOTE
// [CFWS]
//
// qcontent = qtext / quoted-pair
switch ($token) {
// Quoted pair
case ISEMAIL_STRING_BACKSLASH:
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_QUOTEDPAIR;
break;
// Folding White Space
// Inside a quoted string, spaces are allowed as regular characters.
// It's only FWS if we include HTAB or CRLF
case ISEMAIL_STRING_CR:
case ISEMAIL_STRING_HTAB:
if (($token === ISEMAIL_STRING_CR) && ((++$i === $raw_length) || ($email[$i] !== ISEMAIL_STRING_LF))) {$return_status[] = ISEMAIL_ERR_CR_NO_LF; break;} // Fatal error
// https://tools.ietf.org/html/rfc5322#section-3.2.2
// Runs of FWS, comment, or CFWS that occur between lexical tokens in a
// structured header field are semantically interpreted as a single
// space character.
// https://tools.ietf.org/html/rfc5322#section-3.2.4
// the CRLF in any FWS/CFWS that appears within the quoted-string [is]
// semantically "invisible" and therefore not part of the quoted-string
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= ISEMAIL_STRING_SP;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] .= ISEMAIL_STRING_SP;
$element_len++;
$return_status[] = ISEMAIL_CFWS_FWS;
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_FWS;
$token_prior = $token;
break;
// End of quoted string
case ISEMAIL_STRING_DQUOTE:
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= $token;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] .= $token;
$element_len++;
$context_prior = $context;
$context = (int) array_pop($context_stack);
break;
// qtext
default:
// https://tools.ietf.org/html/rfc5322#section-3.2.4
// qtext = %d33 / ; Printable US-ASCII
// %d35-91 / ; characters not including
// %d93-126 / ; "\" or the quote character
// obs-qtext
//
// obs-qtext = obs-NO-WS-CTL
//
// obs-NO-WS-CTL = %d1-8 / ; US-ASCII control
// %d11 / ; characters that do not
// %d12 / ; include the carriage
// %d14-31 / ; return, line feed, and
// %d127 ; white space characters
$ord = ord($token);
if (($ord > 127) || ($ord === 0) || ($ord === 10)) {
$return_status[] = ISEMAIL_ERR_EXPECTING_QTEXT; // Fatal error
} elseif (($ord < 32) || ($ord === 127))
$return_status[] = ISEMAIL_DEPREC_QTEXT;
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= $token;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] .= $token;
$element_len++;
}
// https://tools.ietf.org/html/rfc5322#section-3.4.1
// If the
// string can be represented as a dot-atom (that is, it contains no
// characters other than atext characters or "." surrounded by atext
// characters), then the dot-atom form SHOULD be used and the quoted-
// string form SHOULD NOT be used.
// To do
break;
//-------------------------------------------------------------
// Quoted pair
//-------------------------------------------------------------
case ISEMAIL_CONTEXT_QUOTEDPAIR:
// https://tools.ietf.org/html/rfc5322#section-3.2.1
// quoted-pair = ("\" (VCHAR / WSP)) / obs-qp
//
// VCHAR = %d33-126 ; visible (printing) characters
// WSP = SP / HTAB ; white space
//
// obs-qp = "\" (%d0 / obs-NO-WS-CTL / LF / CR)
//
// obs-NO-WS-CTL = %d1-8 / ; US-ASCII control
// %d11 / ; characters that do not
// %d12 / ; include the carriage
// %d14-31 / ; return, line feed, and
// %d127 ; white space characters
//
// i.e. obs-qp = "\" (%d0-8, %d10-31 / %d127)
$ord = ord($token);
if ($ord > 127)
$return_status[] = ISEMAIL_ERR_EXPECTING_QPAIR; // Fatal error
elseif ((($ord < 31) && ($ord !== 9)) || ($ord === 127)) // SP & HTAB are allowed
$return_status[] = ISEMAIL_DEPREC_QP;
// At this point we know where this qpair occurred so
// we could check to see if the character actually
// needed to be quoted at all.
// https://tools.ietf.org/html/rfc5321#section-4.1.2
// the sending system SHOULD transmit the
// form that uses the minimum quoting possible.
// To do: check whether the character needs to be quoted (escaped) in this context
$context_prior = $context;
$context = (int) array_pop($context_stack); // End of qpair
$token = ISEMAIL_STRING_BACKSLASH . $token;
switch ($context) {
case ISEMAIL_CONTEXT_COMMENT:
break;
case ISEMAIL_CONTEXT_QUOTEDSTRING:
$parsedata[ISEMAIL_COMPONENT_LOCALPART] .= $token;
$atomlist[ISEMAIL_COMPONENT_LOCALPART][$element_count] .= $token;
$element_len += 2; // The maximum sizes specified by RFC 5321 are octet counts, so we must include the backslash
break;
case ISEMAIL_COMPONENT_LITERAL:
$parsedata[ISEMAIL_COMPONENT_DOMAIN] .= $token;
$atomlist[ISEMAIL_COMPONENT_DOMAIN][$element_count] .= $token;
$element_len += 2; // The maximum sizes specified by RFC 5321 are octet counts, so we must include the backslash
break;
default:
die("Quoted pair logic invoked in an invalid context: $context");
}
break;
//-------------------------------------------------------------
// Comment
//-------------------------------------------------------------
case ISEMAIL_CONTEXT_COMMENT:
// https://tools.ietf.org/html/rfc5322#section-3.2.2
// comment = "(" *([FWS] ccontent) [FWS] ")"
//
// ccontent = ctext / quoted-pair / comment
switch ($token) {
// Nested comment
case ISEMAIL_STRING_OPENPARENTHESIS:
// Nested comments are OK
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_COMMENT;
break;
// End of comment
case ISEMAIL_STRING_CLOSEPARENTHESIS:
$context_prior = $context;
$context = (int) array_pop($context_stack);
// https://tools.ietf.org/html/rfc5322#section-3.2.2
// Runs of FWS, comment, or CFWS that occur between lexical tokens in a
// structured header field are semantically interpreted as a single
// space character.
//
// is_email() author's note: This *cannot* mean that we must add a
// space to the address wherever CFWS appears. This would result in
// any addr-spec that had CFWS outside a quoted string being invalid
// for RFC 5321.
// if (($context === ISEMAIL_COMPONENT_LOCALPART) || ($context === ISEMAIL_COMPONENT_DOMAIN)) {
// $parsedata[$context] .= ISEMAIL_STRING_SP;
// $atomlist[$context][$element_count] .= ISEMAIL_STRING_SP;
// $element_len++;
// }
break;
// Quoted pair
case ISEMAIL_STRING_BACKSLASH:
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_QUOTEDPAIR;
break;
// Folding White Space
case ISEMAIL_STRING_CR:
case ISEMAIL_STRING_SP:
case ISEMAIL_STRING_HTAB:
if (($token === ISEMAIL_STRING_CR) && ((++$i === $raw_length) || ($email[$i] !== ISEMAIL_STRING_LF))) {$return_status[] = ISEMAIL_ERR_CR_NO_LF; break;} // Fatal error
$return_status[] = ISEMAIL_CFWS_FWS;
$context_stack[] = $context;
$context = ISEMAIL_CONTEXT_FWS;
$token_prior = $token;
break;
// ctext
default:
// https://tools.ietf.org/html/rfc5322#section-3.2.3
// ctext = %d33-39 / ; Printable US-ASCII
// %d42-91 / ; characters not including
// %d93-126 / ; "(", ")", or "\"
// obs-ctext
//
// obs-ctext = obs-NO-WS-CTL
//
// obs-NO-WS-CTL = %d1-8 / ; US-ASCII control
// %d11 / ; characters that do not
// %d12 / ; include the carriage
// %d14-31 / ; return, line feed, and
// %d127 ; white space characters
$ord = ord($token);
if (($ord > 127) || ($ord === 0) || ($ord === 10)) {
$return_status[] = ISEMAIL_ERR_EXPECTING_CTEXT; // Fatal error
break;
} elseif (($ord < 32) || ($ord === 127)) {
$return_status[] = ISEMAIL_DEPREC_CTEXT;
}
}
break;
//-------------------------------------------------------------
// Folding White Space
//-------------------------------------------------------------
case ISEMAIL_CONTEXT_FWS:
// https://tools.ietf.org/html/rfc5322#section-3.2.2
// FWS = ([*WSP CRLF] 1*WSP) / obs-FWS
// ; Folding white space
// But note the erratum:
// https://www.rfc-editor.org/errata_search.php?rfc=5322&eid=1908:
// In the obsolete syntax, any amount of folding white space MAY be
// inserted where the obs-FWS rule is allowed. This creates the
// possibility of having two consecutive "folds" in a line, and
// therefore the possibility that a line which makes up a folded header
// field could be composed entirely of white space.
//
// obs-FWS = 1*([CRLF] WSP)
if ($token_prior === ISEMAIL_STRING_CR) {
if ($token === ISEMAIL_STRING_CR) {
$return_status[] = ISEMAIL_ERR_FWS_CRLF_X2; // Fatal error
break;
}
if (isset($crlf_count)) {
if (++$crlf_count > 1)
$return_status[] = ISEMAIL_DEPREC_FWS; // Multiple folds = obsolete FWS
} else $crlf_count = 1;
}