C4/SIP/Sip.pm

   1 #
   2 # Sip.pm: General Sip utility functions
   3 #
   4
   5 package C4::SIP::Sip;
   6
   7 use strict;
   8 use warnings;
   9 use Exporter;
  10 use Encode;
  11 use Sys::Syslog qw(syslog);
  12 use POSIX qw(strftime);
  13 use Socket qw(:crlf);
  14 use IO::Handle;
  15
  16 use C4::SIP::Sip::Constants qw(SIP_DATETIME FID_SCREEN_MSG);
  17 use C4::SIP::Sip::Checksum qw(checksum);
  18
  19 use base qw(Exporter);
  20
  21 our @EXPORT_OK = qw(y_or_n timestamp add_field maybe_add add_count
  22     denied sipbool boolspace write_msg
  23     $error_detection $protocol_version $field_delimiter
  24     $last_response);
  25
  26 our %EXPORT_TAGS = (
  27     all => [qw(y_or_n timestamp add_field maybe_add
  28         add_count denied sipbool boolspace write_msg
  29         $error_detection $protocol_version
  30         $field_delimiter $last_response)]);
  31
  32 our $error_detection = 0;
  33 our $protocol_version = 1;
  34 our $field_delimiter = '|'; # Protocol Default
  35
  36 # We need to keep a copy of the last message we sent to the SC,
  37 # in case there's a transmission error and the SC sends us a
  38 # REQUEST_ACS_RESEND.  If we receive a REQUEST_ACS_RESEND before
  39 # we've ever sent anything, then we are to respond with a
  40 # REQUEST_SC_RESEND (p.16)
  41
  42 our $last_response = '';
  43
  44 sub timestamp {
  45     my $time = $_[0] || time();
  46     if ( ref $time eq 'DateTime') {
  47         return $time->strftime(SIP_DATETIME);
  48     } elsif ($time=~m/^(\d{4})\-(\d{2})\-(\d{2})/) {
  49         # passing a db returned date as is + bogus time
  50         return sprintf( '%04d%02d%02d    235900', $1, $2, $3);
  51     }
  52     return strftime(SIP_DATETIME, localtime($time));
  53 }
  54
  55 #
  56 # add_field(field_id, value)
  57 #    return constructed field value
  58 #
  59 sub add_field {
  60     my ($field_id, $value) = @_;
  61     my ($i, $ent);
  62
  63     if (!defined($value)) {
  64         syslog("LOG_DEBUG", "add_field: Undefined value being added to '%s'",
  65                $field_id);
  66                 $value = '';
  67     }
  68     $value=~s/\r/ /g; # CR terminates a sip message
  69                       # Protect against them in sip text fields
  70
  71     # Replace any occurrences of the field delimiter in the
  72     # field value with the HTML character entity
  73     $ent = sprintf("&#%d;", ord($field_delimiter));
  74
  75     while (($i = index($value, $field_delimiter)) != ($[-1)) {
  76                 substr($value, $i, 1) = $ent;
  77     }
  78
  79     return $field_id . $value . $field_delimiter;
  80 }
  81 #
  82 # maybe_add(field_id, value):
  83 #    If value is defined and non-empty, then return the
  84 #    constructed field value, otherwise return the empty string.
  85 #    NOTE: if zero is a valid value for your field, don't use maybe_add!
  86 #
  87 sub maybe_add {
  88     my ($fid, $value, $server) = @_;
  89
  90     if ( $fid eq FID_SCREEN_MSG && $server->{account}->{screen_msg_regex} ) {
  91         foreach my $regex (
  92             ref $server->{account}->{screen_msg_regex} eq "ARRAY"
  93             ? @{ $server->{account}->{screen_msg_regex} }
  94             : $server->{account}->{screen_msg_regex} )
  95         {
  96             $value =~ s/$regex->{find}/$regex->{replace}/g;
  97         }
  98     }
  99
 100     return (defined($value) && $value) ? add_field($fid, $value) : '';
 101 }
 102
 103 #
 104 # add_count()  produce fixed four-character count field,
 105 # or a string of four spaces if the count is invalid for some
 106 # reason
 107 #
 108 sub add_count {
 109     my ($label, $count) = @_;
 110
 111     # If the field is unsupported, it will be undef, return blanks
 112     # as per the spec.
 113     if (!defined($count)) {
 114                 return ' ' x 4;
 115     }
 116
 117     $count = sprintf("%04d", $count);
 118     if (length($count) != 4) {
 119                 syslog("LOG_WARNING", "handle_patron_info: %s wrong size: '%s'",
 120                $label, $count);
 121                 $count = ' ' x 4;
 122     }
 123     return $count;
 124 }
 125
 126 #
 127 # denied($bool)
 128 # if $bool is false, return true.  This is because SIP statuses
 129 # are inverted:  we report that something has been denied, not that
 130 # it's permitted.  For example, 'renewal priv. denied' of 'Y' means
 131 # that the user's not permitted to renew.  I assume that the ILS has
 132 # real positive tests.
 133 #
 134 sub denied {
 135     my $bool = shift;
 136     return boolspace(!$bool);
 137 }
 138
 139 sub sipbool {
 140     my $bool = shift;
 141     return $bool ? 'Y' : 'N';
 142 }
 143
 144 #
 145 # boolspace: ' ' is false, 'Y' is true. (don't ask)
 146 #
 147 sub boolspace {
 148     my $bool = shift;
 149     return $bool ? 'Y' : ' ';
 150 }
 151
 152 #
 153 # write_msg($msg, $file)
 154 #
 155 # Send $msg to the SC.  If error detection is active, then
 156 # add the sequence number (if $seqno is non-zero) and checksum
 157 # to the message, and save the whole thing as $last_response
 158 #
 159 # If $file is set, then it's a file handle: write to it, otherwise
 160 # just write to the default destination.
 161 #
 162
 163 sub write_msg {
 164     my ($self, $msg, $file, $terminator, $encoding) = @_;
 165
 166     $terminator ||= q{};
 167     $terminator = ( $terminator eq 'CR' ) ? $CR : $CRLF;
 168
 169     $msg = encode($encoding, $msg) if ( $encoding );
 170
 171     my $cksum;
 172
 173     # $msg = encode_utf8($msg);
 174     if ($error_detection) {
 175         if (defined($self->{seqno})) {
 176             $msg .= 'AY' . $self->{seqno};
 177         }
 178         $msg .= 'AZ';
 179         $cksum = checksum($msg);
 180         $msg .= sprintf('%04.4X', $cksum);
 181     }
 182
 183
 184     if ($file) {
 185         $file->autoflush(1);
 186         print $file $msg, $terminator;
 187     } else {
 188         STDOUT->autoflush(1);
 189         print $msg, $terminator;
 190         syslog("LOG_INFO", "OUTPUT MSG: '$msg'");
 191     }
 192
 193     $last_response = $msg;
 194 }
 195
 196 1;