1 | package HTTP::Headers::ETag;
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2 |
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3 | use strict;
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4 | use vars qw($VERSION);
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5 | $VERSION = "6.00";
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6 |
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7 | require HTTP::Date;
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8 |
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9 | require HTTP::Headers;
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10 | package HTTP::Headers;
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11 |
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12 | sub _etags
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13 | {
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14 | my $self = shift;
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15 | my $header = shift;
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16 | my @old = _split_etag_list($self->_header($header));
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17 | if (@_) {
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18 | $self->_header($header => join(", ", _split_etag_list(@_)));
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19 | }
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20 | wantarray ? @old : join(", ", @old);
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21 | }
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22 |
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23 | sub etag { shift->_etags("ETag", @_); }
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24 | sub if_match { shift->_etags("If-Match", @_); }
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25 | sub if_none_match { shift->_etags("If-None-Match", @_); }
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26 |
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27 | sub if_range {
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28 | # Either a date or an entity-tag
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29 | my $self = shift;
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30 | my @old = $self->_header("If-Range");
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31 | if (@_) {
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32 | my $new = shift;
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33 | if (!defined $new) {
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34 | $self->remove_header("If-Range");
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35 | }
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36 | elsif ($new =~ /^\d+$/) {
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37 | $self->_date_header("If-Range", $new);
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38 | }
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39 | else {
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40 | $self->_etags("If-Range", $new);
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41 | }
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42 | }
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43 | return unless defined(wantarray);
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44 | for (@old) {
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45 | my $t = HTTP::Date::str2time($_);
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46 | $_ = $t if $t;
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47 | }
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48 | wantarray ? @old : join(", ", @old);
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49 | }
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50 |
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51 |
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52 | # Split a list of entity tag values. The return value is a list
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53 | # consisting of one element per entity tag. Suitable for parsing
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54 | # headers like C<If-Match>, C<If-None-Match>. You might even want to
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55 | # use it on C<ETag> and C<If-Range> entity tag values, because it will
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56 | # normalize them to the common form.
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57 | #
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58 | # entity-tag = [ weak ] opaque-tag
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59 | # weak = "W/"
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60 | # opaque-tag = quoted-string
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61 |
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62 |
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63 | sub _split_etag_list
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64 | {
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65 | my(@val) = @_;
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66 | my @res;
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67 | for (@val) {
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68 | while (length) {
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69 | my $weak = "";
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70 | $weak = "W/" if s,^\s*[wW]/,,;
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71 | my $etag = "";
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72 | if (s/^\s*(\"[^\"\\]*(?:\\.[^\"\\]*)*\")//) {
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73 | push(@res, "$weak$1");
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74 | }
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75 | elsif (s/^\s*,//) {
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76 | push(@res, qq(W/"")) if $weak;
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77 | }
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78 | elsif (s/^\s*([^,\s]+)//) {
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79 | $etag = $1;
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80 | $etag =~ s/([\"\\])/\\$1/g;
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81 | push(@res, qq($weak"$etag"));
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82 | }
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83 | elsif (s/^\s+// || !length) {
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84 | push(@res, qq(W/"")) if $weak;
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85 | }
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86 | else {
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87 | die "This should not happen: '$_'";
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88 | }
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89 | }
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90 | }
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91 | @res;
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92 | }
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93 |
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94 | 1;
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