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package Plack::Middleware::SSI; |
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=head1 NAME |
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Plack::Middleware::SSI - PSGI middleware for server side include content |
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=head1 VERSION |
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0.12 |
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=head1 DESCRIPTION |
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Will try to handle HTML with server side include directives as well as doing |
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what L does for "regular files". |
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=head1 SUPPORTED SSI DIRECTIVES |
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See L, |
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L or |
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L for more details. |
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=head2 set |
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=head2 echo |
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=head2 config |
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=head2 exec |
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=head2 flastmod |
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=head2 fsize |
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=head2 include |
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=head1 SUPPORTED SSI VARIABLES |
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=head2 Standard variables |
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DATE_GMT, DATE_LOCAL, DOCUMENT_NAME, DOCUMENT_URI, LAST_MODIFIED and |
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QUERY_STRING_UNESCAPED. |
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=head2 Extended by this module |
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Any variable defined in L C<$env> will be avaiable in the SSI |
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document. Even so, it is not recommended to use any of those, since |
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it may not be compatible with Apache and friends. |
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=head1 SYNOPSIS |
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$app = builder { enable 'SSI'; $app }; |
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See L for more details. |
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=cut |
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use strict; |
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use warnings; |
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use File::Basename; |
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use POSIX (); |
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use HTTP::Date; |
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use HTTP::Request; |
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use HTTP::Response; |
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use HTTP::Message::PSGI; |
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12363
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use constant DEBUG => $ENV{'PLACK_SSI_TRACE'} ? 1 : 0; |
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use base 'Plack::Middleware'; |
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our $VERSION = '0.12'; |
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my $DEFAULT_ERRMSG = '[an error occurred while processing this directive]'; |
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my $DEFAULT_TIMEFMT = '%A, %d-%b-%Y %H:%M:%S %Z'; |
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my $ANON = 'Plack::Middleware::SSI::__ANON__'; |
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my $SKIP = '__________SKIP__________'; |
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my $CONFIG = '__________CONFIG__________'; |
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my $BUF = '__________BUF__________'; |
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=head1 METHODS |
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=head2 call |
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Returns a callback which can expand chunks of HTML with SSI directives |
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to a complete HTML document. |
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=cut |
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sub call { |
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my($self, $env) = @_; |
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return $self->response_cb($self->app->($env), sub { |
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my $res = shift; |
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my $headers = Plack::Util::headers($res->[1]); |
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my $content_type = $headers->get('Content-Type') || ''; |
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if($content_type =~ m{^text/} or $content_type =~ m{^application/xh?t?ml\b}) { |
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my $buf = ''; |
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my $ssi_variables = { |
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%$env, |
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LAST_MODIFIED_TS => HTTP::Date::str2time($headers->get('Last-Modified') || ''), |
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DOCUMENT_NAME => basename($env->{'PATH_INFO'}), |
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DOCUMENT_URI => $env->{'REQUEST_URI'} || '', |
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QUERY_STRING_UNESCAPED => $env->{'QUERY_STRING'} || '', |
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$BUF => \$buf, |
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}; |
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return sub { $self->_parse_ssi_chunk($ssi_variables, @_) }; |
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} |
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0
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return; |
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}); |
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} |
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# will match partial expression at end of string |
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my $SSI_EXPRESSION = qr{ |
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< (?:\z| # accept end-of-string after each character |
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! (?:\z| |
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- (?:\z| |
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- (?:\z| |
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\# (?:\z| |
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(.*?) \s* (?:\z| # this capture contains the actual expression |
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- (?:\z| |
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- (?:\z| |
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(>) # this capture serves as a flag that we reached end-of-expr |
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)))))))) |
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}sx; |
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sub _parse_ssi_chunk { |
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my($self, $ssi_variables, $chunk) = @_; |
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my $buf = $ssi_variables->{$BUF}; |
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my $out = \do { my $tmp = '' }; |
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unless(defined $chunk) { |
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return $$buf if(delete $ssi_variables->{$BUF}); # return the rest of buffer |
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return; # ...before EOF |
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} |
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153
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$$buf .= $chunk; |
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my $do_keep_buffer; |
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while(my($expression, $is_complete) = $$buf =~ $SSI_EXPRESSION) { |
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$$out .= substr $$buf, 0, $-[0] unless($ssi_variables->{$SKIP}); |
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$$buf = substr $$buf, $is_complete ? $+[0] : $-[0]; |
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# matched incompletely at end of string, |
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# will need more chunks to finish the expression |
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$do_keep_buffer = 1, last if not $is_complete; |
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my $method = $expression =~ s/^(\w+)// ? "_ssi_exp_$1" : '_ssi_exp_unknown'; |
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1425
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my $value = $self->can($method) |
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? $self->$method($expression, $ssi_variables) |
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: $ssi_variables->{$CONFIG}{'errmsg'} || $DEFAULT_ERRMSG; |
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170
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467
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$$out .= $value unless($ssi_variables->{$SKIP}); |
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} |
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if(not $do_keep_buffer) { |
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length $$out ? ($$out .= $$buf) : ($out = $buf) # swap when possible, append if necessary |
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unless($ssi_variables->{$SKIP}); |
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$ssi_variables->{$BUF} = \do { my $tmp = '' }; |
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177
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} |
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return $$out; |
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} |
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182
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#============================================================================= |
183
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# SSI expression parsers |
184
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185
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sub _ssi_exp_set { |
186
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5
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5
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10
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my($self, $expression, $ssi_variables) = @_; |
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my $name = $expression =~ /var="([^"]+)"/ ? $1 : undef; |
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my $value = $expression =~ /value="([^"]*)"/ ? $1 : ''; |
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190
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5
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12
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if(defined $name) { |
191
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5
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29
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$ssi_variables->{$name} = $value; |
192
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} |
193
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else { |
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0
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0
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warn "Found SSI set expression, but no variable name ($expression)" if DEBUG; |
195
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} |
196
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197
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5
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16
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return ''; |
198
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} |
199
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200
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sub _ssi_exp_echo { |
201
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7
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7
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16
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my($self, $expression, $ssi_variables) = @_; |
202
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7
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my($name) = $expression =~ /var="([^"]+)"/ ? $1 : undef; |
203
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204
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7
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50
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20
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if(defined $name) { |
205
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7
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53
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return $ANON->__eval_condition("\$$name", $ssi_variables); |
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} |
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|
|
|
208
|
0
|
|
|
|
|
0
|
warn "Found SSI echo expression, but no variable name ($expression)" if DEBUG; |
209
|
0
|
|
|
|
|
0
|
return ''; |
210
|
|
|
|
|
|
|
} |
211
|
|
|
|
|
|
|
|
212
|
|
|
|
|
|
|
sub _ssi_exp_config { |
213
|
2
|
|
|
2
|
|
10
|
my($self, $expression, $ssi_variables) = @_; |
214
|
2
|
50
|
|
|
|
37
|
my($key, $value) = $expression =~ /(\w+)="([^"]*)"/ ? ($1, $2) : (); |
215
|
|
|
|
|
|
|
|
216
|
2
|
50
|
|
|
|
8
|
if(defined $key) { |
217
|
2
|
|
|
|
|
20
|
$ssi_variables->{$CONFIG}{$key} = $value; |
218
|
|
|
|
|
|
|
} |
219
|
|
|
|
|
|
|
|
220
|
2
|
|
|
|
|
7
|
return ''; |
221
|
|
|
|
|
|
|
} |
222
|
|
|
|
|
|
|
|
223
|
|
|
|
|
|
|
sub _ssi_exp_exec { |
224
|
1
|
|
|
1
|
|
19
|
my($self, $expression, $ssi_variables) = @_; |
225
|
1
|
50
|
|
|
|
38
|
my($cmd) = $expression =~ /cmd="([^"]+)"/ ? $1 : undef; |
226
|
|
|
|
|
|
|
|
227
|
1
|
50
|
|
|
|
11
|
if(defined $cmd) { |
228
|
1
|
|
|
|
|
7270
|
return join '', qx{$cmd}; |
229
|
|
|
|
|
|
|
} |
230
|
|
|
|
|
|
|
|
231
|
0
|
|
|
|
|
0
|
warn "Found SSI cmd expression, but no command ($expression)" if DEBUG; |
232
|
0
|
|
|
|
|
0
|
return ''; |
233
|
|
|
|
|
|
|
} |
234
|
|
|
|
|
|
|
|
235
|
|
|
|
|
|
|
sub _ssi_exp_fsize { |
236
|
1
|
|
|
1
|
|
2
|
my($self, $expression, $ssi_variables) = @_; |
237
|
1
|
50
|
|
|
|
6
|
my $file = $self->_expression_to_file($expression) or return ''; |
238
|
|
|
|
|
|
|
|
239
|
1
|
|
50
|
|
|
48
|
return (stat $file->{'name'})[7] || ''; |
240
|
|
|
|
|
|
|
} |
241
|
|
|
|
|
|
|
|
242
|
|
|
|
|
|
|
sub _ssi_exp_flastmod { |
243
|
1
|
|
|
1
|
|
3
|
my($self, $expression, $ssi_variables) = @_; |
244
|
1
|
50
|
|
|
|
5
|
my $file = $self->_expression_to_file($expression) or return ''; |
245
|
1
|
|
33
|
|
|
7
|
my $fmt = $ssi_variables->{$CONFIG}{'timefmt'} || $DEFAULT_TIMEFMT; |
246
|
|
|
|
|
|
|
|
247
|
1
|
|
50
|
|
|
103
|
return POSIX::strftime($fmt, localtime +(stat $file->{'name'})[9]) || ''; |
248
|
|
|
|
|
|
|
} |
249
|
|
|
|
|
|
|
|
250
|
|
|
|
|
|
|
sub _ssi_exp_include { |
251
|
1
|
|
|
1
|
|
2
|
my($self, $expression, $ssi_variables) = @_; |
252
|
1
|
50
|
|
|
|
6
|
my $file = $self->_expression_to_file($expression) or return ''; |
253
|
1
|
|
|
|
|
3
|
my $buf = ''; |
254
|
1
|
|
|
|
|
2
|
my $text = ''; |
255
|
|
|
|
|
|
|
|
256
|
1
|
|
|
|
|
66
|
local $ssi_variables->{'DOCUMENT_NAME'} = basename $file->{'name'}; |
257
|
1
|
|
|
|
|
3
|
local $ssi_variables->{'LAST_MODIFIED_TS'} = $file->{'mtime'}; |
258
|
1
|
|
|
|
|
7
|
local $ssi_variables->{$BUF} = \$buf; |
259
|
|
|
|
|
|
|
|
260
|
1
|
|
|
|
|
7
|
while(my $line = readline $file->{'filehandle'}) { |
261
|
2
|
|
|
|
|
18
|
$text .= $self->_parse_ssi_chunk($ssi_variables, $line); |
262
|
|
|
|
|
|
|
} |
263
|
|
|
|
|
|
|
|
264
|
|
|
|
|
|
|
# get the rest |
265
|
1
|
|
|
|
|
4
|
$text .= $self->_parse_ssi_chunk($ssi_variables); |
266
|
|
|
|
|
|
|
|
267
|
1
|
|
|
|
|
8
|
return $text; |
268
|
|
|
|
|
|
|
} |
269
|
|
|
|
|
|
|
|
270
|
3
|
|
|
3
|
|
20
|
sub _ssi_exp_if { $_[0]->_evaluate_if_elif_else($_[1], $_[2]) } |
271
|
3
|
|
|
3
|
|
14
|
sub _ssi_exp_elif { $_[0]->_evaluate_if_elif_else($_[1], $_[2]) } |
272
|
3
|
|
|
3
|
|
12
|
sub _ssi_exp_else { $_[0]->_evaluate_if_elif_else('expr="1"', $_[2]) } |
273
|
|
|
|
|
|
|
|
274
|
|
|
|
|
|
|
sub _evaluate_if_elif_else { |
275
|
9
|
|
|
9
|
|
17
|
my($self, $expression, $ssi_variables) = @_; |
276
|
9
|
50
|
|
|
|
53
|
my $condition = $expression =~ /expr="([^"]+)"/ ? $1 : undef; |
277
|
|
|
|
|
|
|
|
278
|
9
|
50
|
|
|
|
24
|
unless(defined $condition) { |
279
|
0
|
|
|
|
|
0
|
warn "Found SSI if expression, but no expression ($expression)" if DEBUG; |
280
|
0
|
|
|
|
|
0
|
return ''; |
281
|
|
|
|
|
|
|
} |
282
|
|
|
|
|
|
|
|
283
|
9
|
100
|
100
|
|
|
69
|
if(defined $ssi_variables->{$SKIP} and $ssi_variables->{$SKIP} != 1) { |
|
|
100
|
|
|
|
|
|
284
|
3
|
|
|
|
|
7
|
$ssi_variables->{$SKIP} = 2; # previously true |
285
|
|
|
|
|
|
|
} |
286
|
|
|
|
|
|
|
elsif($ANON->__eval_condition($condition, $ssi_variables)) { |
287
|
3
|
|
|
|
|
8
|
$ssi_variables->{$SKIP} = 0; # true |
288
|
|
|
|
|
|
|
} |
289
|
|
|
|
|
|
|
else { |
290
|
3
|
|
|
|
|
13
|
$ssi_variables->{$SKIP} = 1; # false |
291
|
|
|
|
|
|
|
} |
292
|
|
|
|
|
|
|
|
293
|
9
|
|
|
|
|
35
|
return ''; |
294
|
|
|
|
|
|
|
} |
295
|
|
|
|
|
|
|
|
296
|
|
|
|
|
|
|
sub _ssi_exp_endif { |
297
|
3
|
|
|
3
|
|
7
|
my($self, $expression, $ssi_variables) = @_; |
298
|
3
|
|
|
|
|
8
|
delete $ssi_variables->{$SKIP}; |
299
|
3
|
|
|
|
|
8
|
return ''; |
300
|
|
|
|
|
|
|
} |
301
|
|
|
|
|
|
|
|
302
|
|
|
|
|
|
|
sub _expression_to_file { |
303
|
3
|
|
|
3
|
|
6
|
my($self, $expression) = @_; |
304
|
|
|
|
|
|
|
|
305
|
3
|
100
|
|
|
|
22
|
if($expression =~ /file="([^"]+)"/) { |
|
|
50
|
|
|
|
|
|
306
|
2
|
|
|
|
|
7
|
my $file = $1; |
307
|
2
|
50
|
|
|
|
252
|
if(open my $FH, '<', $file) { |
308
|
2
|
|
|
|
|
20
|
return { name => $file, filehandle => $FH }; |
309
|
|
|
|
|
|
|
} |
310
|
|
|
|
|
|
|
} |
311
|
|
|
|
|
|
|
elsif($expression =~ /virtual="([^"]+)"/) { |
312
|
1
|
|
|
|
|
3
|
my $file = $1; |
313
|
1
|
|
|
|
|
14
|
my $request = HTTP::Request->new(GET => $file); |
314
|
1
|
|
|
|
|
7938
|
my $response; |
315
|
|
|
|
|
|
|
|
316
|
1
|
50
|
|
|
|
8
|
$request->uri->scheme('http') unless(defined $request->uri->scheme); |
317
|
1
|
50
|
|
|
|
25650
|
$request->uri->host('localhost') unless(defined $request->uri->host); |
318
|
1
|
|
|
|
|
352
|
$response = HTTP::Response->from_psgi( $self->app->($request->to_psgi) ); |
319
|
|
|
|
|
|
|
|
320
|
1
|
50
|
|
|
|
4030
|
if($response->code == 200) { |
321
|
1
|
|
|
|
|
20
|
open my $FH, '<', \$response->content; |
322
|
1
|
|
|
|
|
44
|
return { name => $file, filehandle => $FH }; |
323
|
|
|
|
|
|
|
} |
324
|
|
|
|
|
|
|
} |
325
|
|
|
|
|
|
|
|
326
|
0
|
|
|
|
|
0
|
warn "Could not find file from SSI expression ($expression)" if DEBUG; |
327
|
0
|
|
|
|
|
0
|
return; |
328
|
|
|
|
|
|
|
} |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
#============================================================================= |
331
|
|
|
|
|
|
|
# INTERNAL FUNCTIONS |
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
sub __readline { |
334
|
3
|
|
|
3
|
|
987
|
my($buf, $FH) = @_; |
335
|
3
|
|
|
|
|
47
|
my $tmp = readline $FH; |
336
|
3
|
100
|
|
|
|
320
|
return unless(defined $tmp); |
337
|
2
|
|
|
|
|
6
|
$$buf .= $tmp; |
338
|
2
|
|
|
|
|
8
|
return 1; |
339
|
|
|
|
|
|
|
} |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
=head1 COPYRIGHT & LICENSE |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
This library is free software. You can redistribute it and/or modify |
344
|
|
|
|
|
|
|
it under the same terms as Perl itself. |
345
|
|
|
|
|
|
|
|
346
|
|
|
|
|
|
|
=head1 AUTHOR |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
Jan Henning Thorsen C<< jhthorsen at cpan.org >> |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
=cut |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
package # hide from CPAN |
354
|
|
|
|
|
|
|
Plack::Middleware::SSI::__ANON__; |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
my $pkg = __PACKAGE__; |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
sub __eval_condition { |
359
|
15
|
|
|
15
|
|
840
|
my($class, $expression, $ssi_variables) = @_; |
360
|
|
|
|
|
|
|
|
361
|
1
|
|
|
1
|
|
10509
|
no strict; |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
592
|
|
362
|
|
|
|
|
|
|
|
363
|
15
|
100
|
|
|
|
66
|
if($expression =~ /\$/) { # 1 is always true. do not need variables to figure that out |
364
|
14
|
|
66
|
|
|
80
|
my $fmt = $ssi_variables->{$CONFIG}{'timefmt'} || $DEFAULT_TIMEFMT; |
365
|
|
|
|
|
|
|
|
366
|
14
|
|
66
|
|
|
71
|
$ssi_variables->{"__{$fmt}__DATE_GMT"} ||= do { local $_ = POSIX::strftime($fmt, gmtime); $_ }; |
|
8
|
|
|
|
|
894
|
|
|
8
|
|
|
|
|
56
|
|
367
|
14
|
|
66
|
|
|
503
|
$ssi_variables->{"__{$fmt}__DATE_LOCAL"} ||= POSIX::strftime($fmt, localtime); |
368
|
14
|
|
|
|
|
57
|
$ssi_variables->{'DATE_GMT'} = $ssi_variables->{"__{$fmt}__DATE_GMT"}; |
369
|
14
|
|
|
|
|
44
|
$ssi_variables->{'DATE_LOCAL'} = $ssi_variables->{"__{$fmt}__DATE_LOCAL"}; |
370
|
|
|
|
|
|
|
|
371
|
14
|
100
|
|
|
|
39
|
if(my $mtime = $ssi_variables->{'LAST_MODIFIED_TS'}) { |
372
|
5
|
|
|
|
|
2492
|
$ssi_variables->{'LAST_MODIFIED'} = POSIX::strftime($fmt, localtime $mtime); |
373
|
|
|
|
|
|
|
} |
374
|
|
|
|
|
|
|
|
375
|
14
|
|
|
|
|
25
|
for my $key (keys %{"$pkg\::"}) { |
|
14
|
|
|
|
|
305
|
|
376
|
235
|
100
|
|
|
|
1000
|
next if($key eq '__eval_condition'); |
377
|
221
|
|
|
|
|
2063
|
delete ${"$pkg\::"}{$key}; |
|
221
|
|
|
|
|
1076
|
|
378
|
|
|
|
|
|
|
} |
379
|
14
|
|
|
|
|
97
|
for my $key (keys %$ssi_variables) { |
380
|
253
|
50
|
|
|
|
5677
|
next if($key eq '__eval_condition'); |
381
|
253
|
|
|
|
|
960
|
*{"$pkg\::$key"} = \$ssi_variables->{$key}; |
|
253
|
|
|
|
|
4433
|
|
382
|
|
|
|
|
|
|
} |
383
|
|
|
|
|
|
|
} |
384
|
|
|
|
|
|
|
|
385
|
15
|
|
|
|
|
207
|
warn "eval ($expression)" if Plack::Middleware::SSI::DEBUG; |
386
|
|
|
|
|
|
|
|
387
|
15
|
100
|
|
|
|
8312
|
if(my $res = eval $expression) { |
388
|
11
|
|
|
|
|
46
|
return $res; |
389
|
|
|
|
|
|
|
} |
390
|
4
|
50
|
|
|
|
24
|
if($@) { |
391
|
0
|
|
|
|
|
0
|
warn $@; |
392
|
|
|
|
|
|
|
} |
393
|
|
|
|
|
|
|
|
394
|
4
|
|
|
|
|
18
|
return ''; |
395
|
|
|
|
|
|
|
} |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
1; |