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@@ -0,0 +1,517 @@
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+# Poor Man's CGI Module for Perl
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+#
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+# (c) 2002--2011 Martin Mares <mj@ucw.cz>
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+# Slightly modified by Tomas Valla <tom@ucw.cz>
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+#
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+# This software may be freely distributed and used according to the terms
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+# of the GNU Lesser General Public License.
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+
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+package UCW::CGI;
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+
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+# First of all, set up error handling, so that even errors during parsing
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+# will be reported properly.
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+
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+# Variables to be set by the calling module:
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+# $UCW::CGI::error_mail mail address of the script admin (optional)
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+# (this one has to be set in the BEGIN block!)
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+# $UCW::CGI::error_hook function to be called for reporting errors
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+
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+my $error_reported;
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+my $exit_code;
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+my $debug = 0;
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+
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+sub report_bug($)
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+{
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+ if (!defined $error_reported) {
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+ $error_reported = 1;
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+ print STDERR $_[0];
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+ if (defined($UCW::CGI::error_hook)) {
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+ &$UCW::CGI::error_hook($_[0]);
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+ } else {
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+ print "Content-Type: text/plain\n\n";
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+ print "Internal bug:\n";
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+ print $_[0], "\n";
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+ print "Please notify $UCW::CGI::error_mail\n" if defined $UCW::CGI::error_mail;
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+ }
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+ }
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+ die;
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+}
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+
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+BEGIN {
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+ $SIG{__DIE__} = sub { report_bug($_[0]); };
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+ $SIG{__WARN__} = sub { report_bug("WARNING: " . $_[0]); };
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+ $exit_code = 0;
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+}
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+
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+END {
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+ $? = $exit_code;
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+}
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+
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+use strict;
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+use warnings;
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+
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+require Exporter;
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+our $VERSION = 1.0;
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+our @ISA = qw(Exporter);
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+our @EXPORT = qw(&html_escape &url_escape &url_deescape &url_param_escape &url_param_deescape &self_ref &self_form &http_get);
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+our @EXPORT_OK = qw();
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+
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+our $utf8_mode = 0;
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+
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+sub http_error($;@) {
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+ my $err = shift @_;
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+ print join("\n", "Status: $err", "Content-Type: text/plain", @_, "", $err, "");
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+ exit;
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+}
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+
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+### Escaping ###
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+
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+sub url_escape($) {
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+ my $x = shift @_;
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+ utf8::encode($x) if $utf8_mode;
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+ $x =~ s/([^-\$_.!*'(),0-9A-Za-z\x80-\xff])/"%".unpack('H2',$1)/ge;
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+ utf8::decode($x) if $utf8_mode;
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+ return $x;
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+}
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+
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+sub url_deescape($) {
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+ my $x = shift @_;
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+ utf8::encode($x) if $utf8_mode;
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+ $x =~ s/%(..)/pack("H2",$1)/ge;
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+ utf8::decode($x) if $utf8_mode;
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+ return $x;
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+}
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+
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+sub url_param_escape($) {
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+ my $x = shift @_;
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+ $x = url_escape($x);
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+ $x =~ s/%20/+/g;
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+ return $x;
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+}
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+
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+sub url_param_deescape($) {
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+ my $x = shift @_;
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+ $x =~ s/\+/ /g;
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+ return url_deescape($x);
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+}
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+
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+sub html_escape($) {
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+ my $x = shift @_;
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+ $x =~ s/&/&/g;
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+ $x =~ s/</</g;
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+ $x =~ s/>/>/g;
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+ $x =~ s/"/"/g;
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+ $x =~ s/'/'/g;
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+ return $x;
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+}
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+
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+### Analysing RFC 822 Style Headers ###
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+
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+sub rfc822_prepare($) {
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+ my $x = shift @_;
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+ # Convert all %'s and backslash escapes to %xx escapes
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+ $x =~ s/%/%25/g;
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+ $x =~ s/\\(.)/"%".unpack("H2",$1)/ge;
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+ # Remove all comments, beware, they can be nested (unterminated comments are closed at EOL automatically)
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+ while ($x =~ s/^(("[^"]*"|[^"(])*(\([^)]*)*)(\([^()]*(\)|$))/$1 /) { }
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+ # Remove quotes and escape dangerous characters inside (again closing at the end automatically)
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+ $x =~ s{"([^"]*)("|$)}{my $z=$1; $z =~ s/([^0-9a-zA-Z%_-])/"%".unpack("H2",$1)/ge; $z;}ge;
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+ # All control characters are properly escaped, tokens are clearly visible.
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+ # Finally remove all unnecessary spaces.
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+ $x =~ s/\s+/ /g;
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+ $x =~ s/(^ | $)//g;
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+ $x =~ s{\s*([()<>@,;:\\"/\[\]?=])\s*}{$1}g;
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+ return $x;
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+}
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+
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+sub rfc822_deescape($) {
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+ my $x = shift @_;
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+ return url_deescape($x);
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+}
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+
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+### Reading of HTTP headers ###
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+
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+sub http_get($) {
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+ my $h = shift @_;
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+ $h =~ tr/a-z-/A-Z_/;
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+ return $ENV{"HTTP_$h"} // $ENV{"$h"};
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+}
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+
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+### Parsing of Arguments ###
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+
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+my $main_arg_table;
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+my %raw_args;
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+
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+sub parse_raw_args_ll($$) {
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+ my ($arg, $s) = @_;
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+ $s =~ s/\r\n/\n/g;
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+ $s =~ s/\r/\n/g;
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+ utf8::decode($s) if $utf8_mode;
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+ push @{$raw_args{$arg}}, $s;
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+}
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+
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+sub parse_raw_args($) {
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+ my ($s) = @_;
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+ $s =~ s/\s+//;
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+ for $_ (split /[&:]/, $s) {
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+ (/^([^=]+)=(.*)$/) or next;
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+ my $arg = $1;
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+ $_ = $2;
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+ s/\+/ /g;
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+ s/%(..)/pack("H2",$1)/eg;
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+ parse_raw_args_ll($arg, $_);
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+ }
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+}
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+
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+sub parse_multipart_form_data();
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+
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+sub init_args() {
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+ if (!defined $ENV{"GATEWAY_INTERFACE"}) {
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+ print STDERR "Must be called as a CGI script.\n";
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+ $exit_code = 1;
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+ exit;
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+ }
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+
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+ my $method = $ENV{"REQUEST_METHOD"};
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+ if (my $qs = $ENV{"QUERY_STRING"}) {
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+ parse_raw_args($qs);
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+ }
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+ if ($method eq "GET" || $method eq "HEAD") {
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+ } elsif ($method eq "POST") {
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+ my $content_type = $ENV{"CONTENT_TYPE"} // "";
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+ if ($content_type =~ /^application\/x-www-form-urlencoded\b/i) {
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+ while (<STDIN>) {
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+ chomp;
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+ parse_raw_args($_);
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+ }
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+ } elsif ($content_type =~ /^multipart\/form-data\b/i) {
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+ parse_multipart_form_data();
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+ } else {
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+ http_error "415 Unsupported Media Type";
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+ exit;
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+ }
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+ } else {
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+ http_error "405 Method Not Allowed", "Allow: GET, HEAD, PUT";
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+ }
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+}
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+
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+sub parse_args($) { # CAVEAT: attached files must be defined in the main arg table
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+ my $args = shift @_;
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+ if (!$main_arg_table) {
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+ $main_arg_table = $args;
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+ init_args();
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+ }
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+
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+ for my $a (values %$args) {
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+ my $r = ref($a->{'var'});
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+ defined($a->{'default'}) or $a->{'default'}="";
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+ if ($r eq 'SCALAR') {
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+ ${$a->{'var'}} = $a->{'default'};
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+ } elsif ($r eq 'ARRAY') {
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+ @{$a->{'var'}} = ();
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+ }
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+ }
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+
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+ for my $arg (keys %$args) {
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+ my $a = $args->{$arg};
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+ defined($raw_args{$arg}) or next;
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+ for (@{$raw_args{$arg}}) {
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+ $a->{'multiline'} or s/(\n|\t)/ /g;
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+ s/^\s+//;
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+ s/\s+$//;
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+ if (my $rx = $a->{'check'}) {
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+ if (!/^$rx$/) { $_ = $a->{'default'}; }
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+ }
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+
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+ my $v = $a->{'var'};
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+ my $r = ref($v);
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+ if ($r eq 'SCALAR') {
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+ $$v = $_;
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+ } elsif ($r eq 'ARRAY') {
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+ push @$v, $_;
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+ }
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+ }
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+ }
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+}
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+
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+### Parsing Multipart Form Data ###
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+
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+my $boundary;
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+my $boundary_len;
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+my $mp_buffer;
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+my $mp_buffer_i;
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+my $mp_buffer_boundary;
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+my $mp_eof;
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+
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+sub refill_mp_data($) {
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+ my ($more) = @_;
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+ if ($mp_buffer_boundary >= $mp_buffer_i) {
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+ return $mp_buffer_boundary - $mp_buffer_i;
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+ } elsif ($mp_buffer_i + $more <= length($mp_buffer) - $boundary_len) {
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+ return $more;
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+ } else {
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+ if ($mp_buffer_i) {
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+ $mp_buffer = substr($mp_buffer, $mp_buffer_i);
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+ $mp_buffer_i = 0;
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+ }
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+ while ($mp_buffer_i + $more > length($mp_buffer) - $boundary_len) {
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+ last if $mp_eof;
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+ my $data;
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+ my $n = read(STDIN, $data, 2048);
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+ if ($n > 0) {
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+ $mp_buffer .= $data;
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+ } else {
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+ $mp_eof = 1;
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+ }
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+ }
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+ $mp_buffer_boundary = index($mp_buffer, $boundary, $mp_buffer_i);
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+ if ($mp_buffer_boundary >= 0) {
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+ return $mp_buffer_boundary;
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+ } elsif ($mp_eof) {
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+ return length($mp_buffer);
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+ } else {
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+ return length($mp_buffer) - $boundary_len;
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+ }
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+ }
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+}
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+
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+sub get_mp_line($) {
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+ my ($allow_empty) = @_;
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+ my $n = refill_mp_data(1024);
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+ my $i = index($mp_buffer, "\r\n", $mp_buffer_i);
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+ if ($i >= $mp_buffer_i && $i < $mp_buffer_i + $n - 1) {
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+ my $s = substr($mp_buffer, $mp_buffer_i, $i - $mp_buffer_i);
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+ $mp_buffer_i = $i + 2;
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+ return $s;
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+ } elsif ($allow_empty) {
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+ if ($n) { # An incomplete line
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+ my $s = substr($mp_buffer, $mp_buffer_i, $n);
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+ $mp_buffer_i += $n;
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+ return $s;
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+ } else { # No more lines
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+ return undef;
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+ }
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+ } else {
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+ http_error "400 Bad Request: Premature end of multipart POST data";
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+ }
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+}
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+
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+sub skip_mp_boundary() {
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+ if ($mp_buffer_boundary != $mp_buffer_i) {
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+ http_error "400 Bad Request: Premature end of multipart POST data";
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+ }
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+ $mp_buffer_boundary = -1;
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+ $mp_buffer_i += 2;
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+ my $b = get_mp_line(0);
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+ print STDERR "SEP $b\n" if $debug;
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+ $mp_buffer_boundary = index($mp_buffer, $boundary, $mp_buffer_i);
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+ if (substr("\r\n$b", 0, $boundary_len) eq "$boundary--") {
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+ return 0;
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+ } else {
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+ return 1;
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+ }
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+}
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+
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+sub parse_mp_header() {
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+ my $h = {};
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+ my $last;
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+ while ((my $l = get_mp_line(0)) ne "") {
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+ print STDERR "HH $l\n" if $debug;
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+ if (my ($name, $value) = ($l =~ /([A-Za-z0-9-]+)\s*:\s*(.*)/)) {
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+ $name =~ tr/A-Z/a-z/;
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+ $h->{$name} = $value;
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+ $last = $name;
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+ } elsif ($l =~ /^\s+/ && $last) {
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+ $h->{$last} .= $l;
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+ } else {
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+ $last = undef;
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+ }
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+ }
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+ foreach my $n (keys %$h) {
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+ $h->{$n} = rfc822_prepare($h->{$n});
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+ print STDERR "H $n: $h->{$n}\n" if $debug;
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+ }
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+ return (keys %$h) ? $h : undef;
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+}
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+
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+sub parse_multipart_form_data() {
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+ # First of all, find the boundary string
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+ my $ct = rfc822_prepare($ENV{"CONTENT_TYPE"});
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+ if (!(($boundary) = ($ct =~ /^.*;\s*boundary=([^; ]+)/))) {
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+ http_error "400 Bad Request: Multipart content with no boundary string received";
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+ }
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+ $boundary = rfc822_deescape($boundary);
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+ print STDERR "BOUNDARY IS $boundary\n" if $debug;
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+
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+ # BUG: IE 3.01 on Macintosh forgets to add the "--" at the start of the boundary string
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+ # as the MIME specs preach. Workaround borrowed from CGI.pm in Perl distribution.
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+ my $agent = http_get("User-Agent") // "";
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+ $boundary = "--$boundary" unless $agent =~ /MSIE\s+3\.0[12];\s*Mac/;
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+ $boundary = "\r\n$boundary";
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+ $boundary_len = length($boundary) + 2;
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+
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+ # Check upload size in advance
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+ if (my $size = http_get("Content-Length")) {
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+ my $max_allowed = 0;
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+ foreach my $a (values %$main_arg_table) {
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+ $max_allowed += $a->{"maxsize"} || 65536;
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+ }
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+ if ($size > $max_allowed) {
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+ http_error "413 Request Entity Too Large";
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+ }
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+ }
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+
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+ # Initialize our buffering mechanism and part splitter
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+ $mp_buffer = "\r\n";
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+ $mp_buffer_i = 0;
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+ $mp_buffer_boundary = -1;
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+ $mp_eof = 0;
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+
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+ # Skip garbage before the 1st part
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+ while (my $i = refill_mp_data(256)) { $mp_buffer_i += $i; }
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+ skip_mp_boundary() || return;
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+
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+ # Process individual parts
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+ do { PART: {
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+ print STDERR "NEXT PART\n" if $debug;
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+ my $h = parse_mp_header();
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+ my ($field, $cdisp, $a);
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+ if ($h &&
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+ ($cdisp = $h->{"content-disposition"}) &&
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+ $cdisp =~ /^form-data/ &&
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+ (($field) = ($cdisp =~ /;name=([^;]+)/)) &&
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+ ($a = $main_arg_table->{"$field"})) {
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+ print STDERR "FIELD $field\n" if $debug;
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+ if (defined $h->{"content-transfer-encoding"}) {
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+ http_error "400 Bad Request: Unexpected Content-Transfer-Encoding";
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+ }
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+ if (defined $a->{"var"}) {
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+ while (defined (my $l = get_mp_line(1))) {
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+ print STDERR "VALUE $l\n" if $debug;
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+ parse_raw_args_ll($field, $l);
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+ }
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+ next PART;
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+ } elsif (defined $a->{"file"}) {
|
|
|
+ require File::Temp;
|
|
|
+ require IO::Handle;
|
|
|
+ my $max_size = $a->{"maxsize"} || 1048576;
|
|
|
+ my @tmpargs = (undef, UNLINK => 1);
|
|
|
+ push @tmpargs, DIR => $a->{"tmpdir"} if defined $a->{"tmpdir"};
|
|
|
+ my ($fh, $fn) = File::Temp::tempfile(@tmpargs);
|
|
|
+ print STDERR "FILE UPLOAD to $fn\n" if $debug;
|
|
|
+ ${$a->{"file"}} = $fn;
|
|
|
+ ${$a->{"fh"}} = $fh if defined $a->{"fh"};
|
|
|
+ my $total_size = 0;
|
|
|
+ while (my $i = refill_mp_data(4096)) {
|
|
|
+ print $fh substr($mp_buffer, $mp_buffer_i, $i);
|
|
|
+ $mp_buffer_i += $i;
|
|
|
+ $total_size += $i;
|
|
|
+ if ($total_size > $max_size) { http_error "413 Request Entity Too Large"; }
|
|
|
+ }
|
|
|
+ $fh->flush(); # Don't close the handle, the file would disappear otherwise
|
|
|
+ next PART;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ print STDERR "SKIPPING\n" if $debug;
|
|
|
+ while (my $i = refill_mp_data(256)) { $mp_buffer_i += $i; }
|
|
|
+ } } while (skip_mp_boundary());
|
|
|
+}
|
|
|
+
|
|
|
+### Generating Self-ref URL's ###
|
|
|
+
|
|
|
+sub make_out_args(@) { # Usage: make_out_args([arg_table, ...] name => value, ...)
|
|
|
+ my @arg_tables = ( $main_arg_table );
|
|
|
+ while (@_ && ref($_[0]) eq 'HASH') {
|
|
|
+ push @arg_tables, shift @_;
|
|
|
+ }
|
|
|
+ my %overrides = @_;
|
|
|
+ my $out = {};
|
|
|
+ for my $table (@arg_tables) {
|
|
|
+ for my $name (keys %$table) {
|
|
|
+ my $arg = $table->{$name};
|
|
|
+ defined($arg->{'var'}) || next;
|
|
|
+ defined($arg->{'pass'}) && !$arg->{'pass'} && !exists $overrides{$name} && next;
|
|
|
+ defined $arg->{'default'} or $arg->{'default'} = "";
|
|
|
+ my $value;
|
|
|
+ if (!defined($value = $overrides{$name})) {
|
|
|
+ if (exists $overrides{$name}) {
|
|
|
+ $value = $arg->{'default'};
|
|
|
+ } else {
|
|
|
+ $value = ${$arg->{'var'}};
|
|
|
+ defined $value or $value = $arg->{'default'};
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if ($value ne $arg->{'default'}) {
|
|
|
+ $out->{$name} = $value;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return $out;
|
|
|
+}
|
|
|
+
|
|
|
+sub self_ref(@) {
|
|
|
+ my $out = make_out_args(@_);
|
|
|
+ return "?" . join(':', map { "$_=" . url_param_escape($out->{$_}) } sort keys %$out);
|
|
|
+}
|
|
|
+
|
|
|
+sub self_form(@) {
|
|
|
+ my $out = make_out_args(@_);
|
|
|
+ return join('', map { "<input type=hidden name=$_ value='" . html_escape($out->{$_}) . "'>\n" } sort keys %$out);
|
|
|
+}
|
|
|
+
|
|
|
+### Cookies
|
|
|
+
|
|
|
+sub set_cookie($$@) {
|
|
|
+ #
|
|
|
+ # Unfortunately, the support for the new cookie standard (RFC 2965) among
|
|
|
+ # web browsers is still very scarce, so we are still using the old Netscape
|
|
|
+ # specification.
|
|
|
+ #
|
|
|
+ # Usage: set_cookie(name, value, option => value...), where options are:
|
|
|
+ #
|
|
|
+ # max-age maximal age in seconds
|
|
|
+ # domain domain name scope
|
|
|
+ # path path name scope
|
|
|
+ # secure if present, cookie applies only to SSL connections
|
|
|
+ # (in this case, the value should be undefined)
|
|
|
+ # discard if present with any value, the cookie is discarded
|
|
|
+ #
|
|
|
+
|
|
|
+ my $key = shift @_;
|
|
|
+ my $value = shift @_;
|
|
|
+ my %other = @_;
|
|
|
+ if (exists $other{'discard'}) {
|
|
|
+ delete $other{'discard'};
|
|
|
+ $other{'max-age'} = 0;
|
|
|
+ }
|
|
|
+ if (defined(my $age = $other{'max-age'})) {
|
|
|
+ delete $other{'max-age'};
|
|
|
+ my $exp = ($age ? (time + $age) : 0);
|
|
|
+ # Avoid problems with locales
|
|
|
+ my ($S,$M,$H,$d,$m,$y,$wd) = gmtime $exp;
|
|
|
+ my @wdays = ( 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat' );
|
|
|
+ my @mons = ( 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' );
|
|
|
+ $other{'expires'} = sprintf("%s, %02d-%s-%d %02d:%02d:%02d GMT",
|
|
|
+ $wdays[$wd], $d, $mons[$m], $y+1900, $H, $M, $S);
|
|
|
+ }
|
|
|
+
|
|
|
+ print "Set-Cookie: $key=", url_escape($value);
|
|
|
+ foreach my $k (keys %other) {
|
|
|
+ print "; $k";
|
|
|
+ print "=", $other{$k} if defined $other{$k};
|
|
|
+ }
|
|
|
+ print "\n";
|
|
|
+}
|
|
|
+
|
|
|
+sub parse_cookies() {
|
|
|
+ my $h = http_get("Cookie") or return ();
|
|
|
+ my @cook = ();
|
|
|
+ foreach my $x (split /;\s*/, $h) {
|
|
|
+ my ($k,$v) = split /=/, $x;
|
|
|
+ $v = url_deescape($v) if defined $v;
|
|
|
+ push @cook, $k => $v;
|
|
|
+ }
|
|
|
+ return @cook;
|
|
|
+}
|
|
|
+
|
|
|
+1; # OK
|
Sven Velt