add example psgi app and slide of debug middleware

[chaz/talk-introduction-to-psgi] / app.psgi

diff --git a/app.psgi b/app.psgi
new file mode 100644 (file)
index 0000000..2175cd8
--- /dev/null
+++ b/app.psgi
@@ -0,0 +1,66 @@
+#!/usr/bin/env perl
+
+use Plack::App::Directory;
+use Plack::App::File;
+use Plack::Builder;
+use Plack::Util;
+
+my $sample_app = sub {
+    my $env = shift;
+    my $client_id = $env->{'REMOTE_ADDR'};
+
+    return [
+        '200',
+        [ 'Content-Type' => 'text/plain' ],
+        [ "Your IP address is ${client_id}." ],     # or IO::Handle-like object
+    ];
+};
+
+my $debug_hider = sub {
+    my $app = shift;
+    return sub {
+        my $env = shift;
+        Plack::Util::response_cb($app->($env), sub {
+            my $res     = shift;
+            my $headers = Plack::Util::headers($res->[1]);
+            if (   ! Plack::Util::status_with_no_entity_body($res->[0])
+                && ($headers->get('Content-Type') || '') =~ m!^(?:text/html|application/xhtml\+xml)!) {
+
+                my $content = q{
+<script>
+/* Only show Debug middleware on the "middleware-debug" slide. */
+slideshow.on('showSlide', function (slide) {
+    if (slide.properties.name === 'middleware-debug') {
+        document.getElementById('plDebug').style.display = 'block';
+    }
+});
+slideshow.on('hideSlide', function (slide) {
+    document.getElementById('plDebug').style.display = 'none';
+});
+document.getElementById('plDebug').style.display = 'none';
+</script>
+                };
+
+                return sub {
+                    my $chunk = shift;
+                    return unless defined $chunk;
+                    $chunk =~ s!(?=</body>)!$content!i;
+                    return $chunk;
+                };
+            }
+        });
+    };
+};
+
+builder {
+    enable $debug_hider;
+    enable 'Debug';
+
+    mount '/myip'           => $sample_app;
+
+    mount '/css'           => Plack::App::Directory->new(root => 'css')->to_app;
+    mount '/img'           => Plack::App::Directory->new(root => 'img')->to_app;
+    mount '/remark.min.js'  => Plack::App::File->new(file => 'remark.min.js')->to_app;
+    mount '/'              => Plack::App::File->new(file => 'slides-offline.html')->to_app;
+};
+