summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlperl/lib/HTTP/Message.pm
blob: 944e88d189920238a508cc55f1e6b94083c115a9 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
package HTTP::Message;

use strict;
use vars qw($VERSION $AUTOLOAD);
$VERSION = "5.837";

require HTTP::Headers;
require Carp;

my $CRLF = "\015\012";   # "\r\n" is not portable
$HTTP::URI_CLASS ||= $ENV{PERL_HTTP_URI_CLASS} || "URI";
eval "require $HTTP::URI_CLASS"; die $@ if $@;

*_utf8_downgrade = defined(&utf8::downgrade) ?
    sub {
        utf8::downgrade($_[0], 1) or
            Carp::croak("HTTP::Message content must be bytes")
    }
    :
    sub {
    };

sub new
{
    my($class, $header, $content) = @_;
    if (defined $header) {
	Carp::croak("Bad header argument") unless ref $header;
        if (ref($header) eq "ARRAY") {
	    $header = HTTP::Headers->new(@$header);
	}
	else {
	    $header = $header->clone;
	}
    }
    else {
	$header = HTTP::Headers->new;
    }
    if (defined $content) {
        _utf8_downgrade($content);
    }
    else {
        $content = '';
    }

    bless {
	'_headers' => $header,
	'_content' => $content,
    }, $class;
}


sub parse
{
    my($class, $str) = @_;

    my @hdr;
    while (1) {
	if ($str =~ s/^([^\s:]+)[ \t]*: ?(.*)\n?//) {
	    push(@hdr, $1, $2);
	    $hdr[-1] =~ s/\r\z//;
	}
	elsif (@hdr && $str =~ s/^([ \t].*)\n?//) {
	    $hdr[-1] .= "\n$1";
	    $hdr[-1] =~ s/\r\z//;
	}
	else {
	    $str =~ s/^\r?\n//;
	    last;
	}
    }
    local $HTTP::Headers::TRANSLATE_UNDERSCORE;
    new($class, \@hdr, $str);
}


sub clone
{
    my $self  = shift;
    my $clone = HTTP::Message->new($self->headers,
				   $self->content);
    $clone->protocol($self->protocol);
    $clone;
}


sub clear {
    my $self = shift;
    $self->{_headers}->clear;
    $self->content("");
    delete $self->{_parts};
    return;
}


sub protocol {
    shift->_elem('_protocol',  @_);
}

sub headers {
    my $self = shift;

    # recalculation of _content might change headers, so we
    # need to force it now
    $self->_content unless exists $self->{_content};

    $self->{_headers};
}

sub headers_as_string {
    shift->headers->as_string(@_);
}


sub content  {

    my $self = $_[0];
    if (defined(wantarray)) {
	$self->_content unless exists $self->{_content};
	my $old = $self->{_content};
	$old = $$old if ref($old) eq "SCALAR";
	&_set_content if @_ > 1;
	return $old;
    }

    if (@_ > 1) {
	&_set_content;
    }
    else {
	Carp::carp("Useless content call in void context") if $^W;
    }
}


sub _set_content {
    my $self = $_[0];
    _utf8_downgrade($_[1]);
    if (!ref($_[1]) && ref($self->{_content}) eq "SCALAR") {
	${$self->{_content}} = $_[1];
    }
    else {
	die "Can't set content to be a scalar reference" if ref($_[1]) eq "SCALAR";
	$self->{_content} = $_[1];
	delete $self->{_content_ref};
    }
    delete $self->{_parts} unless $_[2];
}


sub add_content
{
    my $self = shift;
    $self->_content unless exists $self->{_content};
    my $chunkref = \$_[0];
    $chunkref = $$chunkref if ref($$chunkref);  # legacy

    _utf8_downgrade($$chunkref);

    my $ref = ref($self->{_content});
    if (!$ref) {
	$self->{_content} .= $$chunkref;
    }
    elsif ($ref eq "SCALAR") {
	${$self->{_content}} .= $$chunkref;
    }
    else {
	Carp::croak("Can't append to $ref content");
    }
    delete $self->{_parts};
}

sub add_content_utf8 {
    my($self, $buf)  = @_;
    utf8::upgrade($buf);
    utf8::encode($buf);
    $self->add_content($buf);
}

sub content_ref
{
    my $self = shift;
    $self->_content unless exists $self->{_content};
    delete $self->{_parts};
    my $old = \$self->{_content};
    my $old_cref = $self->{_content_ref};
    if (@_) {
	my $new = shift;
	Carp::croak("Setting content_ref to a non-ref") unless ref($new);
	delete $self->{_content};  # avoid modifying $$old
	$self->{_content} = $new;
	$self->{_content_ref}++;
    }
    $old = $$old if $old_cref;
    return $old;
}


sub content_charset
{
    my $self = shift;
    if (my $charset = $self->content_type_charset) {
	return $charset;
    }

    # time to start guessing
    my $cref = $self->decoded_content(ref => 1, charset => "none");

    # Unicode BOM
    for ($$cref) {
	return "UTF-8"     if /^\xEF\xBB\xBF/;
	return "UTF-32-LE" if /^\xFF\xFE\x00\x00/;
	return "UTF-32-BE" if /^\x00\x00\xFE\xFF/;
	return "UTF-16-LE" if /^\xFF\xFE/;
	return "UTF-16-BE" if /^\xFE\xFF/;
    }

    if ($self->content_is_xml) {
	# http://www.w3.org/TR/2006/REC-xml-20060816/#sec-guessing
	# XML entity not accompanied by external encoding information and not
	# in UTF-8 or UTF-16 encoding must begin with an XML encoding declaration,
	# in which the first characters must be '<?xml'
	for ($$cref) {
	    return "UTF-32-BE" if /^\x00\x00\x00</;
	    return "UTF-32-LE" if /^<\x00\x00\x00/;
	    return "UTF-16-BE" if /^(?:\x00\s)*\x00</;
	    return "UTF-16-LE" if /^(?:\s\x00)*<\x00/;
	    if (/^\s*(<\?xml[^\x00]*?\?>)/) {
		if ($1 =~ /\sencoding\s*=\s*(["'])(.*?)\1/) {
		    my $enc = $2;
		    $enc =~ s/^\s+//; $enc =~ s/\s+\z//;
		    return $enc if $enc;
		}
	    }
	}
	return "UTF-8";
    }
    elsif ($self->content_is_html) {
	# look for <META charset="..."> or <META content="...">
	# http://dev.w3.org/html5/spec/Overview.html#determining-the-character-encoding
	my $charset;
	require HTML::Parser;
	my $p = HTML::Parser->new(
	    start_h => [sub {
		my($tag, $attr, $self) = @_;
		$charset = $attr->{charset};
		unless ($charset) {
		    # look at $attr->{content} ...
		    if (my $c = $attr->{content}) {
			require HTTP::Headers::Util;
			my @v = HTTP::Headers::Util::split_header_words($c);
			return unless @v;
			my($ct, undef, %ct_param) = @{$v[0]};
			$charset = $ct_param{charset};
		    }
		    return unless $charset;
		}
		if ($charset =~ /^utf-?16/i) {
		    # converted document, assume UTF-8
		    $charset = "UTF-8";
		}
		$self->eof;
	    }, "tagname, attr, self"],
	    report_tags => [qw(meta)],
	    utf8_mode => 1,
	);
	$p->parse($$cref);
	return $charset if $charset;
    }
    if ($self->content_type =~ /^text\//) {
	for ($$cref) {
	    if (length) {
		return "US-ASCII" unless /[\x80-\xFF]/;
		require Encode;
		eval {
		    Encode::decode_utf8($_, Encode::FB_CROAK() | Encode::LEAVE_SRC());
		};
		return "UTF-8" unless $@;
		return "ISO-8859-1";
	    }
	}
    }

    return undef;
}


sub decoded_content
{
    my($self, %opt) = @_;
    my $content_ref;
    my $content_ref_iscopy;

    eval {
	$content_ref = $self->content_ref;
	die "Can't decode ref content" if ref($content_ref) ne "SCALAR";

	if (my $h = $self->header("Content-Encoding")) {
	    $h =~ s/^\s+//;
	    $h =~ s/\s+$//;
	    for my $ce (reverse split(/\s*,\s*/, lc($h))) {
		next unless $ce;
		next if $ce eq "identity";
		if ($ce eq "gzip" || $ce eq "x-gzip") {
		    require IO::Uncompress::Gunzip;
		    my $output;
		    IO::Uncompress::Gunzip::gunzip($content_ref, \$output, Transparent => 0)
			or die "Can't gunzip content: $IO::Uncompress::Gunzip::GunzipError";
		    $content_ref = \$output;
		    $content_ref_iscopy++;
		}
		elsif ($ce eq "x-bzip2") {
		    require IO::Uncompress::Bunzip2;
		    my $output;
		    IO::Uncompress::Bunzip2::bunzip2($content_ref, \$output, Transparent => 0)
			or die "Can't bunzip content: $IO::Uncompress::Bunzip2::Bunzip2Error";
		    $content_ref = \$output;
		    $content_ref_iscopy++;
		}
		elsif ($ce eq "deflate") {
		    require IO::Uncompress::Inflate;
		    my $output;
		    my $status = IO::Uncompress::Inflate::inflate($content_ref, \$output, Transparent => 0);
		    my $error = $IO::Uncompress::Inflate::InflateError;
		    unless ($status) {
			# "Content-Encoding: deflate" is supposed to mean the
			# "zlib" format of RFC 1950, but Microsoft got that
			# wrong, so some servers sends the raw compressed
			# "deflate" data.  This tries to inflate this format.
			$output = undef;
			require IO::Uncompress::RawInflate;
			unless (IO::Uncompress::RawInflate::rawinflate($content_ref, \$output)) {
			    $self->push_header("Client-Warning" =>
				"Could not raw inflate content: $IO::Uncompress::RawInflate::RawInflateError");
			    $output = undef;
			}
		    }
		    die "Can't inflate content: $error" unless defined $output;
		    $content_ref = \$output;
		    $content_ref_iscopy++;
		}
		elsif ($ce eq "compress" || $ce eq "x-compress") {
		    die "Can't uncompress content";
		}
		elsif ($ce eq "base64") {  # not really C-T-E, but should be harmless
		    require MIME::Base64;
		    $content_ref = \MIME::Base64::decode($$content_ref);
		    $content_ref_iscopy++;
		}
		elsif ($ce eq "quoted-printable") { # not really C-T-E, but should be harmless
		    require MIME::QuotedPrint;
		    $content_ref = \MIME::QuotedPrint::decode($$content_ref);
		    $content_ref_iscopy++;
		}
		else {
		    die "Don't know how to decode Content-Encoding '$ce'";
		}
	    }
	}

	if ($self->content_is_text || (my $is_xml = $self->content_is_xml)) {
	    my $charset = lc(
	        $opt{charset} ||
		$self->content_type_charset ||
		$opt{default_charset} ||
		$self->content_charset ||
		"ISO-8859-1"
	    );
	    unless ($charset =~ /^(?:none|us-ascii|iso-8859-1)\z/) {
		require Encode;
		if (do{my $v = $Encode::VERSION; $v =~ s/_//g; $v} < 2.0901 &&
		    !$content_ref_iscopy)
		{
		    # LEAVE_SRC did not work before Encode-2.0901
		    my $copy = $$content_ref;
		    $content_ref = \$copy;
		    $content_ref_iscopy++;
		}
		eval {
		    $content_ref = \Encode::decode($charset, $$content_ref,
			 ($opt{charset_strict} ? Encode::FB_CROAK() : 0) | Encode::LEAVE_SRC());
		};
		if ($@) {
		    my $retried;
		    if ($@ =~ /^Unknown encoding/) {
			my $alt_charset = lc($opt{alt_charset} || "");
			if ($alt_charset && $charset ne $alt_charset) {
			    # Retry decoding with the alternative charset
			    $content_ref = \Encode::decode($alt_charset, $$content_ref,
				 ($opt{charset_strict} ? Encode::FB_CROAK() : 0) | Encode::LEAVE_SRC())
			        unless $alt_charset =~ /^(?:none|us-ascii|iso-8859-1)\z/;
			    $retried++;
			}
		    }
		    die unless $retried;
		}
		die "Encode::decode() returned undef improperly" unless defined $$content_ref;
		if ($is_xml) {
		    # Get rid of the XML encoding declaration if present
		    $$content_ref =~ s/^\x{FEFF}//;
		    if ($$content_ref =~ /^(\s*<\?xml[^\x00]*?\?>)/) {
			substr($$content_ref, 0, length($1)) =~ s/\sencoding\s*=\s*(["']).*?\1//;
		    }
		}
	    }
	}
    };
    if ($@) {
	Carp::croak($@) if $opt{raise_error};
	return undef;
    }

    return $opt{ref} ? $content_ref : $$content_ref;
}


sub decodable
{
    # should match the Content-Encoding values that decoded_content can deal with
    my $self = shift;
    my @enc;
    # XXX preferably we should determine if the modules are available without loading
    # them here
    eval {
        require IO::Uncompress::Gunzip;
        push(@enc, "gzip", "x-gzip");
    };
    eval {
        require IO::Uncompress::Inflate;
        require IO::Uncompress::RawInflate;
        push(@enc, "deflate");
    };
    eval {
        require IO::Uncompress::Bunzip2;
        push(@enc, "x-bzip2");
    };
    # we don't care about announcing the 'identity', 'base64' and
    # 'quoted-printable' stuff
    return wantarray ? @enc : join(", ", @enc);
}


sub decode
{
    my $self = shift;
    return 1 unless $self->header("Content-Encoding");
    if (defined(my $content = $self->decoded_content(charset => "none"))) {
	$self->remove_header("Content-Encoding", "Content-Length", "Content-MD5");
	$self->content($content);
	return 1;
    }
    return 0;
}


sub encode
{
    my($self, @enc) = @_;

    Carp::croak("Can't encode multipart/* messages") if $self->content_type =~ m,^multipart/,;
    Carp::croak("Can't encode message/* messages") if $self->content_type =~ m,^message/,;

    return 1 unless @enc;  # nothing to do

    my $content = $self->content;
    for my $encoding (@enc) {
	if ($encoding eq "identity") {
	    # nothing to do
	}
	elsif ($encoding eq "base64") {
	    require MIME::Base64;
	    $content = MIME::Base64::encode($content);
	}
	elsif ($encoding eq "gzip" || $encoding eq "x-gzip") {
	    require IO::Compress::Gzip;
	    my $output;
	    IO::Compress::Gzip::gzip(\$content, \$output, Minimal => 1)
		or die "Can't gzip content: $IO::Compress::Gzip::GzipError";
	    $content = $output;
	}
	elsif ($encoding eq "deflate") {
	    require IO::Compress::Deflate;
	    my $output;
	    IO::Compress::Deflate::deflate(\$content, \$output)
		or die "Can't deflate content: $IO::Compress::Deflate::DeflateError";
	    $content = $output;
	}
	elsif ($encoding eq "x-bzip2") {
	    require IO::Compress::Bzip2;
	    my $output;
	    IO::Compress::Bzip2::bzip2(\$content, \$output)
		or die "Can't bzip2 content: $IO::Compress::Bzip2::Bzip2Error";
	    $content = $output;
	}
	elsif ($encoding eq "rot13") {  # for the fun of it
	    $content =~ tr/A-Za-z/N-ZA-Mn-za-m/;
	}
	else {
	    return 0;
	}
    }
    my $h = $self->header("Content-Encoding");
    unshift(@enc, $h) if $h;
    $self->header("Content-Encoding", join(", ", @enc));
    $self->remove_header("Content-Length", "Content-MD5");
    $self->content($content);
    return 1;
}


sub as_string
{
    my($self, $eol) = @_;
    $eol = "\n" unless defined $eol;

    # The calculation of content might update the headers
    # so we need to do that first.
    my $content = $self->content;

    return join("", $self->{'_headers'}->as_string($eol),
		    $eol,
		    $content,
		    (@_ == 1 && length($content) &&
		     $content !~ /\n\z/) ? "\n" : "",
		);
}


sub dump
{
    my($self, %opt) = @_;
    my $content = $self->content;
    my $chopped = 0;
    if (!ref($content)) {
	my $maxlen = $opt{maxlength};
	$maxlen = 512 unless defined($maxlen);
	if ($maxlen && length($content) > $maxlen * 1.1 + 3) {
	    $chopped = length($content) - $maxlen;
	    $content = substr($content, 0, $maxlen) . "...";
	}

	$content =~ s/\\/\\\\/g;
	$content =~ s/\t/\\t/g;
	$content =~ s/\r/\\r/g;

	# no need for 3 digits in escape for these
	$content =~ s/([\0-\11\13-\037])(?!\d)/sprintf('\\%o',ord($1))/eg;

	$content =~ s/([\0-\11\13-\037\177-\377])/sprintf('\\x%02X',ord($1))/eg;
	$content =~ s/([^\12\040-\176])/sprintf('\\x{%X}',ord($1))/eg;

	# remaining whitespace
	$content =~ s/( +)\n/("\\40" x length($1)) . "\n"/eg;
	$content =~ s/(\n+)\n/("\\n" x length($1)) . "\n"/eg;
	$content =~ s/\n\z/\\n/;

	my $no_content = "(no content)";
	if ($content eq $no_content) {
	    # escape our $no_content marker
	    $content =~ s/^(.)/sprintf('\\x%02X',ord($1))/eg;
	}
	elsif ($content eq "") {
	    $content = "(no content)";
	}
    }

    my @dump;
    push(@dump, $opt{preheader}) if $opt{preheader};
    push(@dump, $self->{_headers}->as_string, $content);
    push(@dump, "(+ $chopped more bytes not shown)") if $chopped;

    my $dump = join("\n", @dump, "");
    $dump =~ s/^/$opt{prefix}/gm if $opt{prefix};

    print $dump unless defined wantarray;
    return $dump;
}


sub parts {
    my $self = shift;
    if (defined(wantarray) && (!exists $self->{_parts} || ref($self->{_content}) eq "SCALAR")) {
	$self->_parts;
    }
    my $old = $self->{_parts};
    if (@_) {
	my @parts = map { ref($_) eq 'ARRAY' ? @$_ : $_ } @_;
	my $ct = $self->content_type || "";
	if ($ct =~ m,^message/,) {
	    Carp::croak("Only one part allowed for $ct content")
		if @parts > 1;
	}
	elsif ($ct !~ m,^multipart/,) {
	    $self->remove_content_headers;
	    $self->content_type("multipart/mixed");
	}
	$self->{_parts} = \@parts;
	_stale_content($self);
    }
    return @$old if wantarray;
    return $old->[0];
}

sub add_part {
    my $self = shift;
    if (($self->content_type || "") !~ m,^multipart/,) {
	my $p = HTTP::Message->new($self->remove_content_headers,
				   $self->content(""));
	$self->content_type("multipart/mixed");
	$self->{_parts} = [];
        if ($p->headers->header_field_names || $p->content ne "") {
            push(@{$self->{_parts}}, $p);
        }
    }
    elsif (!exists $self->{_parts} || ref($self->{_content}) eq "SCALAR") {
	$self->_parts;
    }

    push(@{$self->{_parts}}, @_);
    _stale_content($self);
    return;
}

sub _stale_content {
    my $self = shift;
    if (ref($self->{_content}) eq "SCALAR") {
	# must recalculate now
	$self->_content;
    }
    else {
	# just invalidate cache
	delete $self->{_content};
	delete $self->{_content_ref};
    }
}


# delegate all other method calls the the headers object.
sub AUTOLOAD
{
    my $method = substr($AUTOLOAD, rindex($AUTOLOAD, '::')+2);

    # We create the function here so that it will not need to be
    # autoloaded the next time.
    no strict 'refs';
    *$method = sub { shift->headers->$method(@_) };
    goto &$method;
}


sub DESTROY {}  # avoid AUTOLOADing it


# Private method to access members in %$self
sub _elem
{
    my $self = shift;
    my $elem = shift;
    my $old = $self->{$elem};
    $self->{$elem} = $_[0] if @_;
    return $old;
}


# Create private _parts attribute from current _content
sub _parts {
    my $self = shift;
    my $ct = $self->content_type;
    if ($ct =~ m,^multipart/,) {
	require HTTP::Headers::Util;
	my @h = HTTP::Headers::Util::split_header_words($self->header("Content-Type"));
	die "Assert" unless @h;
	my %h = @{$h[0]};
	if (defined(my $b = $h{boundary})) {
	    my $str = $self->content;
	    $str =~ s/\r?\n--\Q$b\E--\r?\n.*//s;
	    if ($str =~ s/(^|.*?\r?\n)--\Q$b\E\r?\n//s) {
		$self->{_parts} = [map HTTP::Message->parse($_),
				   split(/\r?\n--\Q$b\E\r?\n/, $str)]
	    }
	}
    }
    elsif ($ct eq "message/http") {
	require HTTP::Request;
	require HTTP::Response;
	my $content = $self->content;
	my $class = ($content =~ m,^(HTTP/.*)\n,) ?
	    "HTTP::Response" : "HTTP::Request";
	$self->{_parts} = [$class->parse($content)];
    }
    elsif ($ct =~ m,^message/,) {
	$self->{_parts} = [ HTTP::Message->parse($self->content) ];
    }

    $self->{_parts} ||= [];
}


# Create private _content attribute from current _parts
sub _content {
    my $self = shift;
    my $ct = $self->{_headers}->header("Content-Type") || "multipart/mixed";
    if ($ct =~ m,^\s*message/,i) {
	_set_content($self, $self->{_parts}[0]->as_string($CRLF), 1);
	return;
    }

    require HTTP::Headers::Util;
    my @v = HTTP::Headers::Util::split_header_words($ct);
    Carp::carp("Multiple Content-Type headers") if @v > 1;
    @v = @{$v[0]};

    my $boundary;
    my $boundary_index;
    for (my @tmp = @v; @tmp;) {
	my($k, $v) = splice(@tmp, 0, 2);
	if ($k eq "boundary") {
	    $boundary = $v;
	    $boundary_index = @v - @tmp - 1;
	    last;
	}
    }

    my @parts = map $_->as_string($CRLF), @{$self->{_parts}};

    my $bno = 0;
    $boundary = _boundary() unless defined $boundary;
 CHECK_BOUNDARY:
    {
	for (@parts) {
	    if (index($_, $boundary) >= 0) {
		# must have a better boundary
		$boundary = _boundary(++$bno);
		redo CHECK_BOUNDARY;
	    }
	}
    }

    if ($boundary_index) {
	$v[$boundary_index] = $boundary;
    }
    else {
	push(@v, boundary => $boundary);
    }

    $ct = HTTP::Headers::Util::join_header_words(@v);
    $self->{_headers}->header("Content-Type", $ct);

    _set_content($self, "--$boundary$CRLF" .
	                join("$CRLF--$boundary$CRLF", @parts) .
			"$CRLF--$boundary--$CRLF",
                        1);
}


sub _boundary
{
    my $size = shift || return "xYzZY";
    require MIME::Base64;
    my $b = MIME::Base64::encode(join("", map chr(rand(256)), 1..$size*3), "");
    $b =~ s/[\W]/X/g;  # ensure alnum only
    $b;
}


1;


__END__

=head1 NAME

HTTP::Message - HTTP style message (base class)

=head1 SYNOPSIS

 use base 'HTTP::Message';

=head1 DESCRIPTION

An C<HTTP::Message> object contains some headers and a content body.
The following methods are available:

=over 4

=item $mess = HTTP::Message->new

=item $mess = HTTP::Message->new( $headers )

=item $mess = HTTP::Message->new( $headers, $content )

This constructs a new message object.  Normally you would want
construct C<HTTP::Request> or C<HTTP::Response> objects instead.

The optional $header argument should be a reference to an
C<HTTP::Headers> object or a plain array reference of key/value pairs.
If an C<HTTP::Headers> object is provided then a copy of it will be
embedded into the constructed message, i.e. it will not be owned and
can be modified afterwards without affecting the message.

The optional $content argument should be a string of bytes.

=item $mess = HTTP::Message->parse( $str )

This constructs a new message object by parsing the given string.

=item $mess->headers

Returns the embedded C<HTTP::Headers> object.

=item $mess->headers_as_string

=item $mess->headers_as_string( $eol )

Call the as_string() method for the headers in the
message.  This will be the same as

    $mess->headers->as_string

but it will make your program a whole character shorter :-)

=item $mess->content

=item $mess->content( $bytes )

The content() method sets the raw content if an argument is given.  If no
argument is given the content is not touched.  In either case the
original raw content is returned.

Note that the content should be a string of bytes.  Strings in perl
can contain characters outside the range of a byte.  The C<Encode>
module can be used to turn such strings into a string of bytes.

=item $mess->add_content( $bytes )

The add_content() methods appends more data bytes to the end of the
current content buffer.

=item $mess->add_content_utf8( $string )

The add_content_utf8() method appends the UTF-8 bytes representing the
string to the end of the current content buffer.

=item $mess->content_ref

=item $mess->content_ref( \$bytes )

The content_ref() method will return a reference to content buffer string.
It can be more efficient to access the content this way if the content
is huge, and it can even be used for direct manipulation of the content,
for instance:

  ${$res->content_ref} =~ s/\bfoo\b/bar/g;

This example would modify the content buffer in-place.

If an argument is passed it will setup the content to reference some
external source.  The content() and add_content() methods
will automatically dereference scalar references passed this way.  For
other references content() will return the reference itself and
add_content() will refuse to do anything.

=item $mess->content_charset

This returns the charset used by the content in the message.  The
charset is either found as the charset attribute of the
C<Content-Type> header or by guessing.

See L<http://www.w3.org/TR/REC-html40/charset.html#spec-char-encoding>
for details about how charset is determined.

=item $mess->decoded_content( %options )

Returns the content with any C<Content-Encoding> undone and the raw
content encoded to perl's Unicode strings.  If the C<Content-Encoding>
or C<charset> of the message is unknown this method will fail by
returning C<undef>.

The following options can be specified.

=over

=item C<charset>

This override the charset parameter for text content.  The value
C<none> can used to suppress decoding of the charset.

=item C<default_charset>

This override the default charset guessed by content_charset() or
if that fails "ISO-8859-1".

=item C<alt_charset>

If decoding fails because the charset specified in the Content-Type header
isn't recognized by Perl's Encode module, then try decoding using this charset
instead of failing.  The C<alt_charset> might be specified as C<none> to simply
return the string without any decoding of charset as alternative.

=item C<charset_strict>

Abort decoding if malformed characters is found in the content.  By
default you get the substitution character ("\x{FFFD}") in place of
malformed characters.

=item C<raise_error>

If TRUE then raise an exception if not able to decode content.  Reason
might be that the specified C<Content-Encoding> or C<charset> is not
supported.  If this option is FALSE, then decoded_content() will return
C<undef> on errors, but will still set $@.

=item C<ref>

If TRUE then a reference to decoded content is returned.  This might
be more efficient in cases where the decoded content is identical to
the raw content as no data copying is required in this case.

=back

=item $mess->decodable

=item HTTP::Message::decodable()

This returns the encoding identifiers that decoded_content() can
process.  In scalar context returns a comma separated string of
identifiers.

This value is suitable for initializing the C<Accept-Encoding> request
header field.

=item $mess->decode

This method tries to replace the content of the message with the
decoded version and removes the C<Content-Encoding> header.  Returns
TRUE if successful and FALSE if not.

If the message does not have a C<Content-Encoding> header this method
does nothing and returns TRUE.

Note that the content of the message is still bytes after this method
has been called and you still need to call decoded_content() if you
want to process its content as a string.

=item $mess->encode( $encoding, ... )

Apply the given encodings to the content of the message.  Returns TRUE
if successful. The "identity" (non-)encoding is always supported; other
currently supported encodings, subject to availability of required
additional modules, are "gzip", "deflate", "x-bzip2" and "base64".

A successful call to this function will set the C<Content-Encoding>
header.

Note that C<multipart/*> or C<message/*> messages can't be encoded and
this method will croak if you try.

=item $mess->parts

=item $mess->parts( @parts )

=item $mess->parts( \@parts )

Messages can be composite, i.e. contain other messages.  The composite
messages have a content type of C<multipart/*> or C<message/*>.  This
method give access to the contained messages.

The argumentless form will return a list of C<HTTP::Message> objects.
If the content type of $msg is not C<multipart/*> or C<message/*> then
this will return the empty list.  In scalar context only the first
object is returned.  The returned message parts should be regarded as
read-only (future versions of this library might make it possible
to modify the parent by modifying the parts).

If the content type of $msg is C<message/*> then there will only be
one part returned.

If the content type is C<message/http>, then the return value will be
either an C<HTTP::Request> or an C<HTTP::Response> object.

If an @parts argument is given, then the content of the message will be
modified. The array reference form is provided so that an empty list
can be provided.  The @parts array should contain C<HTTP::Message>
objects.  The @parts objects are owned by $mess after this call and
should not be modified or made part of other messages.

When updating the message with this method and the old content type of
$mess is not C<multipart/*> or C<message/*>, then the content type is
set to C<multipart/mixed> and all other content headers are cleared.

This method will croak if the content type is C<message/*> and more
than one part is provided.

=item $mess->add_part( $part )

This will add a part to a message.  The $part argument should be
another C<HTTP::Message> object.  If the previous content type of
$mess is not C<multipart/*> then the old content (together with all
content headers) will be made part #1 and the content type made
C<multipart/mixed> before the new part is added.  The $part object is
owned by $mess after this call and should not be modified or made part
of other messages.

There is no return value.

=item $mess->clear

Will clear the headers and set the content to the empty string.  There
is no return value

=item $mess->protocol

=item $mess->protocol( $proto )

Sets the HTTP protocol used for the message.  The protocol() is a string
like C<HTTP/1.0> or C<HTTP/1.1>.

=item $mess->clone

Returns a copy of the message object.

=item $mess->as_string

=item $mess->as_string( $eol )

Returns the message formatted as a single string.

The optional $eol parameter specifies the line ending sequence to use.
The default is "\n".  If no $eol is given then as_string will ensure
that the returned string is newline terminated (even when the message
content is not).  No extra newline is appended if an explicit $eol is
passed.

=item $mess->dump( %opt )

Returns the message formatted as a string.  In void context print the string.

This differs from C<< $mess->as_string >> in that it escapes the bytes
of the content so that it's safe to print them and it limits how much
content to print.  The escapes syntax used is the same as for Perl's
double quoted strings.  If there is no content the string "(no
content)" is shown in its place.

Options to influence the output can be passed as key/value pairs. The
following options are recognized:

=over

=item maxlength => $num

How much of the content to show.  The default is 512.  Set this to 0
for unlimited.

If the content is longer then the string is chopped at the limit and
the string "...\n(### more bytes not shown)" appended.

=item prefix => $str

A string that will be prefixed to each line of the dump.

=back

=back

All methods unknown to C<HTTP::Message> itself are delegated to the
C<HTTP::Headers> object that is part of every message.  This allows
convenient access to these methods.  Refer to L<HTTP::Headers> for
details of these methods:

    $mess->header( $field => $val )
    $mess->push_header( $field => $val )
    $mess->init_header( $field => $val )
    $mess->remove_header( $field )
    $mess->remove_content_headers
    $mess->header_field_names
    $mess->scan( \&doit )

    $mess->date
    $mess->expires
    $mess->if_modified_since
    $mess->if_unmodified_since
    $mess->last_modified
    $mess->content_type
    $mess->content_encoding
    $mess->content_length
    $mess->content_language
    $mess->title
    $mess->user_agent
    $mess->server
    $mess->from
    $mess->referer
    $mess->www_authenticate
    $mess->authorization
    $mess->proxy_authorization
    $mess->authorization_basic
    $mess->proxy_authorization_basic

=head1 COPYRIGHT

Copyright 1995-2004 Gisle Aas.

This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.