Initial commit.

lib/perl5/Selima/XHTML.pm

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+# Selima Website Content Management System
+# XHTML.pm: The subroutine to return application/xhtml+xml on supported browsers and text/html othersise.
+
+#  Copyright (c) 2004-2018 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: 2004-12-26
+
+package Selima::XHTML;
+use 5.008;
+use strict;
+use warnings;
+use base qw(Exporter);
+use vars qw(@EXPORT @EXPORT_OK);
+BEGIN {
+@EXPORT = qw(xhtml_content_type);
+@EXPORT_OK = @EXPORT;
+# Prototype declaration
+sub xhtml_content_type();
+}
+
+use Selima::DataVars qw($IS_MODPERL :env);
+
+# xhtml_content_type: Check whether application/xhtml+xml or text/html
+#   should be sent to the client
+sub xhtml_content_type() {
+    local ($_, %_);
+    my ($r, $acpt, $ua);
+    
+    # Obtain the required parameters
+    if ($IS_MODPERL) {
+        $r = $IS_MP2? Apache2::RequestUtil->request:
+            Apache->request;
+        $acpt = $r->headers_in->get("Accept");
+        $ua = $r->headers_in->get("User-Agent");
+    } else {
+        $acpt = exists $ENV{"HTTP_ACCEPT"}? $ENV{"HTTP_ACCEPT"}: undef;
+        $ua = exists $ENV{"HTTP_USER_AGENT"}? $ENV{"HTTP_USER_AGENT"}: undef;
+    }
+    
+    # Browsers that claim to support application/xhtml+xml explicitly
+    return "application/xhtml+xml"
+        if defined $acpt && $acpt =~ /\bapplication\/xhtml\+xml\b/;
+    # Browsers that are known to support application/xhtml+xml
+    return "application/xhtml+xml"
+        if defined $ua && $ua =~ /^W3C_Validator\//;
+    # Else, we assume that application/xhtml+xml is not supported
+    return "text/html";
+}
+
+return 1;