Add config option to block user agents in robots.txt

config.go

@@ -35,6 +35,7 @@ type config struct {
 	TTS           *configTTS             `mapstructure:"tts"`
 	Reactions     *configReactions       `mapstructure:"reactions"`
 	Pprof         *configPprof           `mapstructure:"pprof"`
+	RobotsTxt     *configRobotsTxt       `mapstructure:"robotstxt"`
 	Debug         bool                   `mapstructure:"debug"`
 	initialized   bool
 }
@@ -355,6 +356,10 @@ type configPlugin struct {
 	Config map[string]any `mapstructure:"config"`
 }
 
+type configRobotsTxt struct {
+	BlockedBots []string `mapstructure:"blockedBots"`
+}
+
 func (a *goBlog) loadConfigFile(file string) error {
 	// Use viper to load the config file
 	v := viper.New()

example-config.yml

@@ -178,6 +178,11 @@ tts:
 reactions:
   enabled: true # Enable reactions (default is false)
 
+# Block bots using the robots.txt
+robotstxt:
+  blockedBots: # List all bots that should be disallowed to crawl the site (default is empty)
+    - GPTBot
+
 # Blogs
 defaultBlog: en # Default blog (needed because you can define multiple blogs)
 blogs:

robotstxt.go

@@ -14,6 +14,14 @@ func (a *goBlog) serveRobotsTXT(w http.ResponseWriter, _ *http.Request) {
 		return
 	}
 	_, _ = fmt.Fprint(w, "Allow: /\n\n")
+	if a.cfg.RobotsTxt != nil && len(a.cfg.RobotsTxt.BlockedBots) != 0 {
+		for _, bot := range a.cfg.RobotsTxt.BlockedBots {
+			_, _ = fmt.Fprint(w, "User-agent: ")
+			_, _ = fmt.Fprint(w, bot)
+			_, _ = fmt.Fprint(w, "\n")
+			_, _ = fmt.Fprint(w, "Disallow: /\n\n")
+		}
+	}
 	_, _ = fmt.Fprintf(w, "Sitemap: %s\n", a.getFullAddress(sitemapPath))
 	for _, bc := range a.cfg.Blogs {
 		_, _ = fmt.Fprintf(w, "Sitemap: %s\n", a.getFullAddress(bc.getRelativePath(sitemapBlogPath)))

robotstxt_test.go

@@ -10,29 +10,62 @@ import (
 
 func Test_robotsTXT(t *testing.T) {
 
-	app := &goBlog{
-		cfg: &config{
-			Server: &configServer{
-				PublicAddress: "https://example.com",
+	t.Run("Default", func(t *testing.T) {
+		app := &goBlog{
+			cfg: &config{
+				Server: &configServer{
+					PublicAddress: "https://example.com",
+				},
 			},
-		},
-	}
-
-	rec := httptest.NewRecorder()
-	req := httptest.NewRequest("GET", "/robots.txt", nil)
-	app.serveRobotsTXT(rec, req)
-	assert.Equal(t, http.StatusOK, rec.Code)
-	assert.Equal(t, "User-agent: *\nAllow: /\n\nSitemap: https://example.com/sitemap.xml\n", rec.Body.String())
-
-	app.cfg.PrivateMode = &configPrivateMode{
-		Enabled: true,
-	}
-	assert.True(t, app.isPrivate())
-
-	rec = httptest.NewRecorder()
-	req = httptest.NewRequest("GET", "/robots.txt", nil)
-	app.serveRobotsTXT(rec, req)
-	assert.Equal(t, http.StatusOK, rec.Code)
-	assert.Equal(t, "User-agent: *\nDisallow: /\n", rec.Body.String())
+		}
+
+		rec := httptest.NewRecorder()
+		req := httptest.NewRequest("GET", "/robots.txt", nil)
+		app.serveRobotsTXT(rec, req)
+		assert.Equal(t, http.StatusOK, rec.Code)
+		assert.Equal(t, "User-agent: *\nAllow: /\n\nSitemap: https://example.com/sitemap.xml\n", rec.Body.String())
+	})
+
+	t.Run("Private mode", func(t *testing.T) {
+		app := &goBlog{
+			cfg: &config{
+				Server: &configServer{
+					PublicAddress: "https://example.com",
+				},
+				PrivateMode: &configPrivateMode{
+					Enabled: true,
+				},
+			},
+		}
+
+		assert.True(t, app.isPrivate())
+
+		rec := httptest.NewRecorder()
+		req := httptest.NewRequest("GET", "/robots.txt", nil)
+		app.serveRobotsTXT(rec, req)
+		assert.Equal(t, http.StatusOK, rec.Code)
+		assert.Equal(t, "User-agent: *\nDisallow: /\n", rec.Body.String())
+	})
+
+	t.Run("Blocked bot", func(t *testing.T) {
+		app := &goBlog{
+			cfg: &config{
+				Server: &configServer{
+					PublicAddress: "https://example.com",
+				},
+				RobotsTxt: &configRobotsTxt{
+					BlockedBots: []string{
+						"GPTBot",
+					},
+				},
+			},
+		}
+
+		rec := httptest.NewRecorder()
+		req := httptest.NewRequest("GET", "/robots.txt", nil)
+		app.serveRobotsTXT(rec, req)
+		assert.Equal(t, http.StatusOK, rec.Code)
+		assert.Equal(t, "User-agent: *\nAllow: /\n\nUser-agent: GPTBot\nDisallow: /\n\nSitemap: https://example.com/sitemap.xml\n", rec.Body.String())
+	})
 
 }