Initial commit.

lib/perl5/Selima/LastModf.pm

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+# Selima Website Content Management System
+# LastModf.pm: The web site last-modified time calculator.
+
+#  Copyright (c) 2003-2018 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+# Author: imacat <imacat@mail.imacat.idv.tw>
+# First written: 2003-03-23
+
+package Selima::LastModf;
+use 5.008;
+use strict;
+use warnings;
+use base qw(Exporter);
+use vars qw(@EXPORT @EXPORT_OK);
+BEGIN {
+@EXPORT = qw(not_modified);
+@EXPORT_OK = @EXPORT;
+# Prototype declaration
+sub not_modified(\@\@);
+sub find_last_modified(\@\@);
+sub check_inc();
+sub updmtime_tables(\@);
+sub updmtime_file($);
+}
+
+use File::Spec::Functions qw(catfile);
+use HTTP::Date qw(str2time);
+
+use Selima::CallForm;
+use Selima::DataVars qw($DBH :input :l10n :lninfo :lastmod :libdir :requri :siteconf);
+use Selima::GetLang;
+use Selima::HTTP;
+use Selima::Session;
+
+# not_modified: Check if we should send "HTTP/1.1 304 Not Modified"
+sub not_modified(\@\@) {
+    local ($_, %_);
+    my ($tables, $files);
+    ($tables, $files) = @_;
+    # HTTP/1.1 304 only works for GET or HEAD
+    return 0 unless $ENV{"REQUEST_METHOD"} eq "GET"
+                    || $ENV{"REQUEST_METHOD"} eq "HEAD";
+    # Find the last-modified time
+    find_last_modified @$tables, @$files;
+    # If-Modified-Since not supplied.  The client had not cached yet.
+    return 0 if !exists $ENV{"HTTP_IF_MODIFIED_SINCE"};
+    # Malformed If-Modified-Since value
+    return 0 if !defined($_ = str2time($ENV{"HTTP_IF_MODIFIED_SINCE"}));
+    # We are newer than the cache
+    return 0 if $LAST_MODIFIED > $_;
+    # Yes, use the cache
+    return 1;
+}
+
+# find_last_modified: Find the last-modified time
+sub find_last_modified(\@\@) {
+    local ($_, %_);
+    my ($tables, $files);
+    ($tables, $files) = @_;
+    
+    # Checked before
+    return if defined $LAST_MODIFIED;
+    
+    # Remove duplicates
+    %_ = map { $_ => 1 } @$tables;
+    @$tables = keys %_;
+    %_ = map { $_ => 1 } @$files;
+    @$files = keys %_;
+    
+    # Start with EPOCH 1970-01-01 00:00:00
+    $LAST_MODIFIED = 0;
+    
+    # Check myself
+    updmtime_file $0;
+    # Check mtime from the included modules and gettext MO files
+    check_inc;
+    # Check the supplied data files
+    updmtime_file $_ foreach grep -f $_, @$files;
+    # Check the supplied data tables
+    updmtime_tables @$tables;
+    # Check the saved form and status
+    if (defined $GET->param("formid")) {
+        $_ = catfile($Selima::Session::DIR, "saveform_" . $GET->param("formid"));
+        updmtime_file $_ if -f $_;
+    }
+    if (defined $GET->param("statid")) {
+        $_ = catfile($Selima::Session::DIR, "savestat_" . $GET->param("statid"));
+        updmtime_file $_ if -f $_;
+    }
+    
+    return;
+}
+
+# check_inc: Check mtime from the included modules and gettext MO files
+sub check_inc() {
+    local ($_, %_);
+    my ($t, $DH);
+    
+    # Check the included modules
+    updmtime_file $_ foreach grep /^\Q$SITE_LIBDIR\E\b/, values %INC;
+    $t = COMMON_LIBDIR;
+    updmtime_file $_ foreach grep /^$t\b/, values %INC;
+    
+    # Check the header and footer
+    $_ = $DOC_ROOT . "/magicat/include";
+    @_ = qw();
+    if (@ALL_LINGUAS > 1) {
+        push @_, $_ . "/header." . getlang(LN_FILENAME) . ".html";
+        push @_, $_ . "/footer." . getlang(LN_FILENAME) . ".html";
+    } else {
+        push @_, $_ . "/header.html";
+        push @_, $_ . "/footer.html";
+    }
+    foreach (@_) {
+        updmtime_file $_ if -e $_;
+    }
+    
+    # Check the gettext mo files
+    if (-d $LOCALEDIR) {
+        opendir $DH, $LOCALEDIR     or http_500 "$LOCALEDIR: $!";
+        @_ = readdir $DH            or http_500 "$LOCALEDIR: $!";
+        closedir $DH                or http_500 "$LOCALEDIR: $!";
+        foreach (@_) {
+            $_ = "$LOCALEDIR/$_/LC_MESSAGES/$PACKAGE.mo";
+            updmtime_file $_ if -f $_;
+        }
+    }
+    opendir $DH, COMMON_LOCALEDIR   or http_500 COMMON_LOCALEDIR . ": $!";
+    @_ = readdir $DH                or http_500 COMMON_LOCALEDIR . ": $!";
+    closedir $DH                    or http_500 COMMON_LOCALEDIR . ": $!";
+    foreach (@_) {
+        $_ = COMMON_LOCALEDIR . "/$_/LC_MESSAGES/" . COMMON_DOMAIN . ".mo";
+        updmtime_file $_ if -f $_;
+    }
+    
+    return;
+}
+
+# updmtime_tables: Update the $LAST_MODIFIED with the mtime of tables
+sub updmtime_tables(\@) {
+    local ($_, %_);
+    my ($tables, $sql, $sth);
+    $tables = $_[0];
+    # Only work when using database
+    return if !defined $DBH;
+    
+    return unless defined($_ = $DBH->lastupd(@$tables));
+    $_ = int $_;
+    $LAST_MODIFIED = $_ if defined $_ && $LAST_MODIFIED < $_;
+    return;
+}
+
+# updmtime_file: Update the $LAST_MODIFIED with the mtime of a file
+sub updmtime_file($) {
+    local ($_, %_);
+    $_ = (stat $_[0])[9];
+    $LAST_MODIFIED = $_ if $LAST_MODIFIED < $_;
+    return;
+}
+
+return 1;