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package Plack::Middleware::ConditionalGET; |
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use strict; |
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65
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use parent qw( Plack::Middleware ); |
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149
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use Plack::Util; |
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522
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6
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sub call { |
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1
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my $self = shift; |
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11
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my $env = shift; |
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my $res = $self->app->($env); |
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100
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return $res unless $env->{REQUEST_METHOD} =~ /^(GET|HEAD)$/; |
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$self->response_cb($res, sub { |
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10
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my $res = shift; |
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10
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my $h = Plack::Util::headers($res->[1]); |
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18
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# check both ETag and If-Modified-Since, and at least one should exist |
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# and all present headers should match, not either. |
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10
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100
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my @checks = ( $self->etag_matches($h, $env), $self->not_modified_since($h, $env) ) |
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or return; |
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9
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100
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unless (grep !$_, @checks) { |
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5
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$res->[0] = 304; |
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5
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$h->remove($_) for qw( Content-Type Content-Length Content-Disposition ); |
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5
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100
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if ($res->[2]) { |
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4
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$res->[2] = []; |
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} else { |
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return sub { |
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4
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100
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return defined $_[0] ? '' : undef; |
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1
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}; |
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} |
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} |
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10
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}); |
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} |
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no warnings 'uninitialized'; |
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# RFC 2616 14.25 says it's OK and expected to use 'eq' :) |
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# > Note: When handling an If-Modified-Since header field, some |
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# > servers will use an exact date comparison function, rather than a |
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# > less-than function, for deciding whether to send a 304 ... |
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44
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sub etag_matches { |
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10
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10
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0
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my($self, $h, $env) = @_; |
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10
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100
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60
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return unless $h->exists('ETag'); |
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6
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$h->get('ETag') eq _value($env->{HTTP_IF_NONE_MATCH}); |
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} |
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50
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sub not_modified_since { |
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10
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10
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0
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my($self, $h, $env) = @_; |
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10
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100
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return unless $h->exists('Last-Modified'); |
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6
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$h->get('Last-Modified') eq _value($env->{HTTP_IF_MODIFIED_SINCE}); |
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} |
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56
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sub _value { |
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12
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12
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19
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my $str = shift; |
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# IE sends wrong formatted value(i.e. "Thu, 03 Dec 2009 01:46:32 GMT; length=17936") |
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12
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$str =~ s/;.*$//; |
60
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12
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44
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return $str; |
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} |
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63
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1; |
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65
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__END__ |