Add Google Analytics GA4 plugin

plugin/google_analytics_ga.rb

@@ -0,0 +1,68 @@
+#
+# Google Analytics GA4 plugin for tDiary
+#
+# Copyright (C) 2025 KITADAI Yukinori <[email protected]>
+# You can redistribute it and/or modify it under GPL2.
+#
+if /^(?:latest|day|month|nyear|search)$/ =~ @mode then
+	add_footer_proc do
+		google_analytics_ga_insert_code
+	end
+end
+
+def google_analytics_ga_insert_code
+	return '' unless @conf['google_analytics_ga.profile']
+	<<-HTML
+		<!-- Global site tag (gtag.js) - Google Analytics -->
+		<script async src="https://www.googletagmanager.com/gtag/js?id=#{@conf['google_analytics_ga.profile']}"></script>
+		<script>
+			window.dataLayer = window.dataLayer || [];
+			function gtag(){dataLayer.push(arguments);}
+			gtag('js', new Date());
+
+			gtag('config', '#{@conf['google_analytics_ga.profile']}');
+		</script>
+	HTML
+end
+
+# G-XXXXXXXXXX
+add_conf_proc( 'google_analytics_ga', 'Google Analytics GA4' ) do
+	if @mode == 'saveconf' then
+		@conf['google_analytics_ga.profile'] = @cgi.params['google_analytics_ga.profile'][0]
+	end
+	r = <<-HTML
+		<h3>Google Analytics GA4 Profile</h3>
+		<p>set your Profile ID (G-XXXXXXXXXX)</p>
+		<p><input name="google_analytics_ga.profile" value="#{h @conf['google_analytics_ga.profile']}"></p>
+	HTML
+	r
+end
+
+if defined? AMP
+	add_amp_header_proc do
+		%Q|<script async custom-element="amp-analytics"
+			src="https://cdn.ampproject.org/v0/amp-analytics-0.1.js"></script>|
+	end
+
+	add_amp_body_enter_proc do
+		profile_id = %w(google_analytics_ga.profile).map {|key|
+			@conf[key]
+		}.find {|profile|
+			profile && !profile.empty?
+		}
+		<<-HTML
+			<amp-analytics type="gtag" data-credentials="include">
+			<script type="application/json">
+			{
+				"vars": {
+				 	"gtag_id": "#{h profile_id}"
+				 	"config" : {
+						"#{h profile_id}": { "groups": "default" }
+					}
+				}
+			}
+			</script>
+			</amp-analytics>
+		HTML
+	end
+end

spec/google_analytics_ga_spec.rb

@@ -0,0 +1,59 @@
+$:.unshift(File.dirname(__FILE__))
+require 'spec_helper'
+
+describe "google_analytics_ga plugin" do
+	def setup_google_analytics_ga_plugin(profile_id, mode)
+		fake_plugin(:google_analytics_ga) { |plugin|
+			plugin.mode = mode
+			plugin.conf['google_analytics_ga.profile'] = profile_id
+		}
+	end
+
+	describe "should render javascript" do
+		before do
+			@plugin = setup_google_analytics_ga_plugin('G-XXXXXXXXXX', 'latest')
+		end
+
+		it "for footer" do
+			snippet = @plugin.footer_proc
+			expect(snippet).to eq(expected_html_footer_snippet)
+		end
+	end
+
+	describe "should render javascript" do
+		before do
+			@plugin = setup_google_analytics_ga_plugin('G-XXXXXXXXXX', 'conf')
+		end
+
+		it "for footer" do
+			snippet = @plugin.footer_proc
+			expect(snippet).to be_empty
+		end
+	end
+
+	describe "should not render when profile_id is empty" do
+		before do
+			@plugin = setup_google_analytics_ga_plugin(nil, 'latest')
+		end
+
+		it "for footer" do
+			snippet = @plugin.footer_proc
+			expect(snippet).to be_empty
+		end
+	end
+
+	def expected_html_footer_snippet
+		expected = <<-SCRIPT
+			<!-- Global site tag (gtag.js) - Google Analytics -->
+			<script async src="https://www.googletagmanager.com/gtag/js?id=G-XXXXXXXXXX"></script>
+			<script>
+				window.dataLayer = window.dataLayer || [];
+				function gtag(){dataLayer.push(arguments);}
+				gtag('js', new Date());
+
+				gtag('config', 'G-XXXXXXXXXX');
+			</script>
+		SCRIPT
+		expected.gsub( /^\t/, '' ).chomp
+	end
+end